Sugar cane plantation owners needed cheap labor after the enslaved were freed.
What are sugar cane plantations?We know that in the nineteenth century the era of slave trade was actually coming to a close and the concern of many of the slave owners both in Europe and America was the future of their agricultural businesses.
The slave owners mostly used the slaves to do the work on the farm and in the absence of the slaves, the work could not be done. This is why the owners of the slaves sought for cheap labor after the slaves were freed.
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Sugar was important in the late nineteenth century for both dietary and economic reasons. It was consumed by all social classes and significantly influenced the labor practices in agriculture.
Explanation:Based on the information provided, one can infer that sugar was of significant importance in the late nineteenth century. It served as a staple in people's daily diets and was enjoyed by all social classes, from shopgirls to kings. In the economic sphere, sugar cane farming was a notable industry. Sugar canes were labor-intensive to grow and harvest, which required plantation owners to seek cheap labor. This implies that the sugar industry had a substantial influence on labor practices during this era. It is therefore clear that sugar was not only a dietary necessity but also a crucial factor in the broader economic and social structure of the community.
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After a jar of liquid has been sealed, the level of the liquid decreases slightly because of evaporation. After a slight decrease, the level of the liquid ceases to change. Why?
Explanation: The level of the liquid in a sealed jar decreases slightly due to the evaporation of some of the liquid molecules into the air space above the liquid. However, once the concentration of the liquid molecules in the air space reaches a certain level, the rate of evaporation will slow down. This is because the concentration of the liquid molecules in the air space will eventually reach a point where the rate of evaporation is balanced by the rate of condensation.
At this point, the liquid molecules in the air space will be colliding with the surface of the liquid at the same rate that liquid molecules are evaporating from the surface of the liquid. As a result, the level of the liquid will cease to change, and the liquid will remain at a stable level within the jar.
If 100.0 moles of H and 40.0 moles of O, react to produce water, which one is the limiting reactant in the
reaction below?
2 H, (g) + 02 (g) - > 2 H20(g)
If 100.0 moles of H₂ and 40.0 moles of O₂, react to produce water, H₂ one is the limiting reactant.
What is limiting reactant?When a chemical reaction is complete, the limiting reagent—also known as the limiting reactant or limiting agent—is the reactant that has been completely consumed. Since the reaction cannot proceed without this reagent, the amount of product that can be produced is constrained. Excess reagents or excess reactants are any reagents that are present in amounts greater than those necessary to cause a reaction with the limiting reagent.
Since the amount of product produced when the limiting reagent interacts entirely is defined as the theoretical yield, the limiting reagent must be identified in order to calculate the percentage yield of a reaction.
The limiting reactant is H₂ because it is the reactant that controls the amount of product produced. When 100 moles of H₂ and 40 moles of O₂ react, all of the H₂ will have been consumed, but there will still be O₂ left over. This means that the reaction was limited by the H₂ and that is the limiting reactant. The solution can be determined by using the following equation:
n(H₂) = 100.0 moles
n(O₂) = 40.0 moles
n(H₂) / (n(O₂) / 2) = ratio of H₂ to O₂
100.0 moles / (40.0 moles / 2) = 5.0
Since the ratio of H₂ to O₂ is 5.0, this indicates that there is more H₂ than O₂ and therefore H₂ is the limiting reactant in the reaction.
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What is a product?
A. A substance that is used during a chemical reaction
B. A substance that doesn't change during a chemical reaction
OC. A substance that turns into waste during a chemical reaction
OD. A substance that is produced during a chemical reaction
Answer:
D. something's that's produced during a chemical reaction
Answer:
Explanation:
The answer is Option D.
A substance that is produced during a chemical reaction.
for example in a chemical reaction A+B -----> C
here, reactants A and B react together to produce product C.
What mass in grams of tin would be required to completely react with 1.20 L of 0.750 M HBr in the following chemical reaction?
Sn(s) + 4 HBr(aq) → SnBr₄ (aq) + 2 H₂ (g)
26.71 g mass of tin would be required to completely react with 1.20 L of 0.750 M HBr.
What is mass ?
Mass is a measure of the amount of matter in an object or substance. It is often expressed in units of grams (g) or kilograms (kg). Mass is a fundamental property of matter and is different from weight, which is the force exerted on an object by gravity and varies depending on the object's location. Mass can be measured using a balance or scale, and is an important factor in many chemical calculations and experiments, such as determining the amount of reactants needed for a reaction or the concentration of a solution.
First, we need to determine the number of moles of HBr in the solution:
moles of HBr = Molarity x Volume
moles of HBr = 0.750 mol/L x 1.20 L
moles of HBr = 0.900 mol
According to the balanced chemical equation, 1 mole of Sn reacts with 4 moles of HBr to produce 1 mole of SnBr₄. Therefore, the number of moles of Sn required can be calculated as:
moles of Sn = (moles of HBr) / 4
moles of Sn = 0.900 mol / 4
moles of Sn = 0.225 mol
The molar mass of Sn is 118.71 g/mol, so the mass of Sn required can be calculated as:
mass of Sn = moles of Sn x molar mass of Sn
mass of Sn = 0.225 mol x 118.71 g/mol
mass of Sn = 26.71 g
Therefore, 26.71 g of tin would be required to completely react with 1.20 L of 0.750 M HBr.
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Complete question is: 26.71 g mass in grams of tin would be required to completely react with 1.20 L of 0.750 M HBr in the chemical reaction. Sn(s) + 4 HBr(aq) → SnBr₄ (aq) + 2 H₂ (g)
Question 1
This diagram shows Earth in four different positions during its yearly orbit around the sun. Which of the following accurately describes the position of the United States during the summer months?
Question 2
The diagram models 4 lunar phases. During which one is the tide the highest?
Question 3
An HR Diagram is shown below. A star that has a luminosity of 10^-2 is likely a…
Question 4
Earth's atmosphere blocks short wavelengths of the electromagnetic spectrum. Which telescopes DO NOT need to be placed in orbit around Earth to observe short-length radiation?
Question 5
A student models the relationship between the Earth and the Sun using string and a ball. Which of the following explains the relationship demonstrated?
Answer 1:
During the summer months in the northern hemisphere (where the United States is located), Earth is in position C, which is when the northern hemisphere is tilted towards the sun.
Answer 2:
The highest tide occurs during the full moon phase, which is represented by position C in the diagram.
Answer 3:
A star that has a luminosity of 10^-2 is likely a red dwarf.
Answer 4:
Telescopes that observe short-wavelength radiation, such as X-rays and gamma rays, do not need to be placed in orbit around Earth because these wavelengths are absorbed by the atmosphere. Therefore, telescopes that observe these wavelengths are typically placed in space, outside of Earth's atmosphere.
Answer 5:
The student is likely demonstrating the relationship between the Earth and the Sun's gravitational pull. The ball represents the Sun, and the string represents the gravitational force pulling the Earth towards the Sun. The demonstration shows how the Earth orbits the Sun due to this gravitational force.
What is gravitational force?Gravitational force is described as a force that exists between any two objects in the universe that have mass.
It is the force that causes objects with mass to be attracted to each other. The magnitude of the gravitational force between two objects depends on their masses and the distance between them.
Along with the electromagnetic force, the strong nuclear force, and the weak nuclear force, gravity is one of the four fundamental forces of the universe.
Sir Isaac Newton initially introduced it in his law of universal gravitation, and Albert Einstein later elaborated on it in his theory of general relativity.
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Water rolls off a duck's back but thoroughly wets a head of human hair. What do these observations reveal about the chemical nature of these two sur- faces?
Explanation:
The observations that water rolls off a duck's back but thoroughly wets a head of human hair reveal that the surfaces of the duck feathers and human hair have different physical and chemical properties.
Duck feathers have a unique structure that helps them repel water. They are coated in a special oil that makes them hydrophobic, or water-repelling. The oil forms a layer on the surface of the feathers that prevents water from penetrating into the feather structure. Additionally, the feather structure is tightly packed and has a lot of surface curvature, which also helps to prevent water from sticking to the feathers. This is why water rolls off a duck's back.
In contrast, human hair does not have a hydrophobic coating, and its surface is relatively smooth. This means that water can easily stick to the surface of human hair and thoroughly wet it.
Overall, these observations reveal that the chemical nature of the surfaces of duck feathers and human hair are different, and that these differences have a significant impact on how they interact with water.
Name the following compounds NH4CI
The compound NH4Cl or ammonium chloride is composed of two ions: ammonium ion (NH4+) and chloride ion (Cl-). The ammonium ion is a polyatomic cation made up of one nitrogen atom and four hydrogen atoms, while the chloride ion is a monatomic anion made up of one chlorine atom.
A-scientist has a 2.5 g-sample of radium-226: How many grams of the sample will decay.in-800
-years if the half-life is 1600-years?
The mass (in grams) of the sample that will decay in 800 years, given that the half-life is 1600-years is 0.78 g
How do i determine the amount that will decay in 800 years?We shall begin our calculation by obtaining the number of half lives that has elapsed after 800 years. Details below:
Half-life (t½) = 1600 yearsTime (t) = 800 yearsNumber of half-lives (n) =?n = t / t½
n = 800 / 1600
n = 0.5
Next, we shall determine the amount remaining after 800 years. Details below:
Original percentage (N₀) = 2.5 gNumber of half-lives (n) = 0.5Amount remaining (N) = ?N = N₀ / 2ⁿ
N = 2.5 / 2^0.5
N = 1.77 g
Finally, we shall obtain the mass of the sample that has decayed in 800 years. Details below:
Original amount (N₀) = 2.5 gAmount remaining (N) = 1.77 gMass that decay =?Mass that decay = N₀ - N
Mass that decay = 2.5 - 1.77
Mass that decay = 0.78 g
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Considering both the forward and reverse directions, identify the Bronsted acids in the reaction below:
CH₃NH₂(aq) + H₂S(aq) ⇄ CH₃NH₃⁺(aq) + HS⁻(aq)
A.) CH₃NH₂ and HS⁻
B.) H₂S and CH₃NH₃⁺
C.) CH₃NH₂ and N₂S
D.) H₂S and HS⁻
E.) CH₃NH₂ and CH₃NH₃⁺
Considering both the forward and the reverse directions, the Bronsted acids in the reaction is H₂S and CH₃NH₃⁺. The correct option is B.
The chemical reaction is as :
CH₃NH₂(aq) + H₂S(aq) ⇄ CH₃NH₃⁺(aq) + HS⁻(aq)
According to the Bronsted - Lowry theory, acids are the substance that will donates the H⁺ ion or the proton and it will forms the conjugate base.
In the forward reaction, the H₂S donates the proton to the CH₃NH₂.
In the reverse reaction, the CH₃NH₃⁺ will donates the proton to the HS⁻.
Hence, the Bronsted - Lowry acids in the reversible reaction are H₂S and CH₃NH₃⁺. The option B is correct.
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For the first order question
N2O5(g)》2NO2(g)+1÷2O2(g)
t1÷2=22.5 h at 20°C and 1.5 h at 40°C
a) calculate the activation energy of this reaction
b) if the arrhenius constant A=2.05×10^13 s^-1 determine the value of k at 30°C
This reaction has an activation energy of about 81.6 kJ/mol.
At 30 °C, the value of k is roughly 1.10 × 10¹³ s⁻¹.
How to determine activation energy and constant?a) To calculate the activation energy, use the Arrhenius equation:
k = A × e^(-Ea/RT)
where k = rate constant, A = pre-exponential factor, Ea = activation energy, R = gas constant, and T = temperature in Kelvin.
Use the given half-lives to calculate the rate constants at each temperature:
k₁ = 0.693 / t₁/2 = 0.693 / 22.5 = 0.0308 h⁻¹ at 20°C
k₂ = 0.693 / t₁/2 = 0.693 / 1.5 = 0.462 h⁻¹ at 40°C
Converting the temperatures to Kelvin:
T1 = 20°C + 273.15 = 293.15 K
T2 = 40°C + 273.15 = 313.15 K
Now use the Arrhenius equation to calculate the activation energy:
ln(k1/k2) = (Ea/R) × (1/T₂ - 1/T₁)
ln(0.0308/0.462) = (Ea/8.314) × (1/313.15 - 1/293.15)
-3.31 = (Ea/8.314) × (0.003386)
Ea = -3.31 × 8.314 / 0.003386 = 81570 J/mol
Therefore, the activation energy for this reaction is approximately 81.6 kJ/mol.
b) Use the Arrhenius equation again, with the given activation energy, A, and the new temperature (30°C = 303.15 K) to solve for k:
ln(k) = ln(A) - (Ea/R) × (1/T)
ln(k) = ln(2.05×10¹³) - (81570 / 8.314) × (1/303.15)
ln(k) = 31.87
k = e^(31.87) = 1.10 × 10¹³ s⁻¹
Therefore, the value of k at 30°C is approximately 1.10 × 10¹³ s⁻¹.
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Calculate the number of valence electrons in methylene chloride, CH₂Cl₂.
Answer:
20 valence electrons
Explanation:
The number of valence electrons in carbon (C), hydrogen (H), and chlorine (Cl) are 4, 1, and 7, respectively. The number of total valence electrons (TVE) in CH₂Cl₂ is calculated as follows-
TVE in CH₂Cl₂ = valence electrons in C + 2(valence electrons in H) + 2(valence electrons in Cl)
= 4 + 2(1) + 2(7)
= 20
Identify the differences in composition properties
Answer:
The composition and properties of a substance are different from each other.
The composition of a substance is what he substance is made of.
Let's take water as an example. We know that the chemical formula for water is . This tells us that water has 2 hydrogen molecules and 1 oxygen molecule. That is the composition of water.
The properties of a substance are how a substance appears and behaves both chemically and physically.
Again, let's use water as an example. Most times, water is a clear liquid. It freezes at 0 degrees Celsius and boils at 100 degrees Celsius. These are some of water's physical properties. Water also has many chemical properties; however, we needn't go into those.
Explanation:
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you found ΔTb = 5.3 C in the last stp. Use this an the information below to find the boiling pint of the solution(BP solutions)
To solve molality use the following equation: ΔTb = Kb x molality.
How to solve molality?Molality (m) is a measure of the concentration of a solution and is defined as the number of moles of solute per kilogram of solvent. To calculate molality, follow these steps:
Determine the mass of the solvent (in kilograms) used to make the solution. This can be measured directly or calculated from the volume and density of the solvent.Determine the number of moles of solute present in the solution. This can be calculated by dividing the mass of solute by its molar mass.Divide the number of moles of solute by the mass of the solvent (in kilograms). This gives the molality of the solution in units of moles per kilogram (mol/kg).To find the boiling point of the solution (BP solutions), the boiling point elevation constant (Kb) of the solvent and the molality of the solution. With these values, we can use the following equation:
ΔTb = Kb x molality
where ΔTb is the boiling point elevation, Kb is the boiling point elevation constant of the solvent, and molality is the molal concentration of the solution.
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informartion on rhenium oxide in 100 words
Rhenium oxide is a chemical compound composed of rhenium and oxygen atoms. Its chemical formula is ReO3, and it is a black or dark gray solid with a crystalline structure. Rhenium oxide is a highly refractory material with a very high melting point and excellent thermal stability, which makes it useful in high-temperature applications such as furnace linings and electrical contacts. It is also used as a catalyst in various chemical reactions, including the production of synthetic ammonia and in the dehydrogenation of alcohols. Rhenium oxide is a relatively rare material and is generally produced as a byproduct of other mining and refining processes. It has a number of unique properties that make it valuable in a variety of industrial and scientific applications.
All of the following are unique properties of water except ____
Water has high specific heat.
Water has high heat of vaporization.
Water expands when it freezes.
Water is a non polar molecule.
Answer:
Water is a non polar molecule
Explanation:
Water interacts differently with charged and polar substances than with nonpolar substances because of the polarity of its own molecules. Water molecules are polar, with partial positive charges on the hydrogens, a partial negative charge on the oxygen, and a bent overall structure.
Find ΔE for the change in state of 1.0 mol H2O (l) at 79∘C to H2O(g) at 114 ∘C. The heat capacity of H2O(l) = 75.3 J/molK, the heat capacity of H2O(g) = 25.0 J/molK, and the heat of vaporization of H2O is 40.7×103J/mol at 100 ∘C.
The energy change for the change in state of 1.0 mol H2O (l) at 79∘C to H2O(g) at 114∘C is 42,643 J/mol.
What are heat capacity and specific heat?The heat capacity of a thing is the amount of energy needed to raise its temperature by one degree Celsius. The amount of energy needed to increase the temperature of 1 gram of a substance by 1oC is known as a substance's specific heat.
We have to calculate the power needed to warm one mole of liquid water from 79∘C to 100∘C:
q1 = nCΔT
= (1.0 mol)(75.3 J/molK)(100-79 K)
= 1593 J
we have to calculate the energy,
q2 = nΔHvap
= (1.0 mol)(40.7×10^3 J/mol)
= 40,700 J
Now, we have to calculate the energy,
q3 = nCΔT
q3 = (1.0 mol)(25.0 J/molK)(114-100 K)
q3 = 350 J
The total energy change is:
ΔE = q1 + q2 + q3
ΔE = 1593 J + 40,700 J + 350 J
ΔE = 42,643 J/mol
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1AgNO3+1NaBr->1AgBr+1NaNo3
If 15.0g silver nitrite is reacted with excess sodium bromide, how many moles of silver bromide will form?
0.0882 moles of silver bromide (AgBr) will form.
calculating the number of moles of silver nitrate (AgNO₃) used in the reaction:
moles of AgNO₃ = mass / molar mass
The molar mass of AgNO₃ is:
AgNO₃: 107.87 + 14.01 + 3(16.00) = 169.87 g/mol
So, the number of moles of AgNO₃ used is:
moles of AgNO₃ = 15.0 g / 169.87 g/mol = 0.0882 mol
Since the reaction occurs in a 1:1 ratio of AgNO₃ to AgBr, the number of moles of AgBr produced will also be 0.0882 mol.
Therefore, 0.0882 moles of silver bromide (AgBr) will form.
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why is glucose a macromolecule?
Answer:
Sugar
Explanation:
Glucose is a carbohydrate. Carbohydrates are mainly used for quick energy inside cells, but they also play an important role in cell structure and communication. Carbohydrates are macromolecules called polysaccharides, meaning they are made of many sugars.
a metal worker used a cutting torch that operated by reacting acetylene gas with oxygen gas, as shown in the unbalanced equation below. balance the following equation for the reaction of acetylene and oxygen, using the smallest whole-number coefficients. (the values are 1,2,3,4,5)
The balanced equation for the reaction of acetylene (C₂H₂) and oxygen (O₂) is; 2 C₂H₂(g) + 5 O₂(g) → 4 CO₂(g) + 2 H₂O(g) + heat
The coefficients in the balanced equation represent the stoichiometric ratio of the reactants and products in the chemical reaction. In this case, 2 molecules of acetylene (C₂H₂) react with 5 molecules of oxygen (O₂) to produce 4 molecules of carbon dioxide (CO₂) and 2 molecules of water (H₂O), along with the release of heat.
The balanced equation shows that the number of atoms of each element is the same on both the sides of the equation, in accordance with the law of conservation of mass.
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10. How many moles are in 20 grams of Carbon (12 amu)?
11. How many moles are in 2.9 grams of Lithium (7 amu)?
12. How many moles are in 0.001 grams of Chlorine (35 amu)?
13. How many grams are in 10 moles of Beryllium (9 amu)?
14. How many grams are in 3.4 moles of Nitrogen (14 amu)?
15. How many grams are in 1.5 moles of Hydrogen (1 amu)?
16. How many atoms are in 10 moles of Helium?
17. How many atoms are in 0.003 moles of Neon?
18. How many atoms are in 2.7 moles of Sodium?
19. How many atoms are in 3.0 grams of Boron (9 amu)?
20. How many atoms are in 5.6 grams of Nitrogen?
i need help please for all of them
O Macmillan Learning
What is the IUPAC name for the compound shown?
IUPAC name:
The IUPAC name for this compound is 2,2-methyl-3ethylhexane.
What is a compound's IUPAC name?The IUPAC terminology is based on the longest chain of carbons joined by a single bond, whether it be a continuous chain or a ring. Prefixes or suffixes are used to denote any modifications, regardless of whether they include multiple bonds or atoms other than carbon and hydrogen.
Who are you according to IUPAC?The International Union of Pure and Applied Chemistry's (IUPAC) suggested system for naming organic chemical compounds is used in chemical nomenclature (IUPAC). The Organic Chemistry Nomenclature publishes. It is the organisation most renowned for its work establishing nomenclature standards in chemistry and other scientific disciplines.
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Calculate the mass of the white solid calcium carbonate that forms with 25.0L of a 0.100 M calcium nitrate solution mixed with 20.0 mL of a 0.15M sodium carbonate solution.
Answer:
The mass of the white solid calcium carbonate that forms is 0.300 g.
Explanation:
To calculate the mass of the white solid calcium carbonate that forms, we first need to determine the limiting reagent in the reaction between calcium nitrate and sodium carbonate. The balanced chemical equation for the reaction is:
Ca(NO3)2(aq) + Na2CO3(aq) → CaCO3(s) + 2NaNO3(aq)
From the equation, we can see that one mole of calcium nitrate reacts with one mole of sodium carbonate to produce one mole of calcium carbonate. Therefore, the limiting reagent is the one that produces the least amount of calcium carbonate.
To determine the limiting reagent, we need to calculate the moles of calcium nitrate and sodium carbonate used in the reaction:
Moles of calcium nitrate = volume of solution (L) x concentration (mol/L) = 25.0 L x 0.100 mol/L = 2.50 mol
Moles of sodium carbonate = volume of solution (L) x concentration (mol/L) = 0.0200 L x 0.150 mol/L = 0.00300 mol
Since the moles of sodium carbonate are much smaller than the moles of calcium nitrate, sodium carbonate is the limiting reagent.
The balanced chemical equation tells us that one mole of calcium carbonate is produced for every mole of sodium carbonate used. Therefore, the moles of calcium carbonate produced are also equal to 0.00300 mol.
Finally, we can calculate the mass of calcium carbonate produced using the molar mass of calcium carbonate:
Mass = moles x molar mass = 0.00300 mol x 100.1 g/mol = 0.300 g
Therefore, the mass of the white solid calcium carbonate that forms is 0.300 g.
Mangrove trees grow in swampy areas and have strong roots that hold the soil in place. How is this helpful for the environment?
a
They absorb water from the soil.
b
They overtake the environment.
c
They provide wood for humans.
d
They protect the land from eroding
Mangrove trees' robust roots aid in stabilizing the soil and preventing soil erosion. This is especially crucial in swampy coastal locations, where the soil is frequently loose and prone to wind and wave erosion. Mangrove trees work to stabilize the coastline and stop land erosion by securing the soil in place.
Mangrove trees also aid in removing contaminants from the water, enhancing the quality of the water in coastal areas while serving as an essential home for a variety of wildlife species. Mangrove trees contribute significantly to environmental protection and are an essential component of coastal ecosystems.
Mangrove trees are crucial for environmental preservation because they hold the soil in place and stop erosion in marshy coastal areas. They also provide crucial habitats for numerous wildlife species, stabilize the coastline, and stop the land from being lost to erosion while enhancing water quality by filtering pollutants from the ocean.
Mangrove trees are an essential part of coastal ecosystems overall, and preserving them is essential for preserving a healthy and sustainable environment.
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student recorded the dates in may on which they observed a full moon and last quarter moon. Om which dates will most likely be able to observe a new moon?
The first quarter is the point in the lunar cycle where the moon is one (1) week after the new moon has risen. At first quarter, the moon will also be in its "waning gibbous" phase.
A full moon and a new moon are two different things?The moon is called a "new moon" when it lies between the sun and the Earth, as opposed to a "full moon," which occurs when the moon is directly above. Furthermore, because we cannot even see the new moon from Earth, unlike full moons, it appears as though it doesn't exist at all.
A half (1/2) or 50% of the moon is lighted during the waning gibbous phase, which occurs once per new moon.
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Question
How do plants make their own food?
Drag and drop the words into the boxes to correctly complete the explanation.
The process of Response area allows plants to make their own food. In this process, plants capture the energy of Response area. They use the energy to combine Response area and water. The products include Response area, which is food for the plant. The other product is Response area, which the plant releases into the air.
The answers we got
sunlight
photosynthesis
oxygen
carbon dioxide
glucose
pls help its a master and i have a week or 2 left
Photosynthesis is the method by which plants produce their own food. Plants and other living things employ the process of photosynthesis to transform light into chemical energy that is then stored as starch that can be used at a later time. A vital step in plant growth is photosynthesis.
In your own words, describe how plants produce their own food ?.As autotrophs, plants produce their own sustenance. During the process of photosynthesis, they turn water, sunlight, and carbon dioxide into oxygen or simple sugars that the plant uses as fuel. These fundamental producers, which form the basis of an ecosystem, provide food for subsequent trophic levels.
Why is light essential for plants to produce food?Plants use the energy of a sun's light during the process of photosynthesis. Where the carbon dioxide and water are combined to create glucose, which the plants use as nourishment, using the trapped light energy to convert into chemical energy.
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What is 99+49x901/1098
Answer:
139.20856102 this is thee answer
Answer:
139,18
Explanation:
the question says “preform the following unitless calculations and round the final answer to the proper number of significant figures. Assume that all the numbers came from measurements” Please help me I don’t understand
Unitless calculations and rounding the final answer to the proper number of significant figures : a) 3.323 b) 5.8 c) 42.02 d) 15.7025
What is meant by significant figures?Significant figures represent the meaningful and reliable digits in a number.
a) 3.41 - 0.086652 = 3.323348
Since both numbers have four significant figures, the final answer should also have four significant figures. Therefore, rounding the final answer to four significant figures gives: 3.323
b) 17.441 / 3 = 5.813666666666666
The least precise value in this calculation is 3, which has only one significant figure. Therefore, rounding the final answer to one significant figure gives: 5.8
c) 21.01 * 2 = 42.02
Both numbers have four significant figures, so the final answer should also have four significant figures. Therefore, the final answer is: 42.02
d) 18.7644 - 3.472 + 0.4101 = 15.7025
All three numbers have five significant figures, so the final answer should also have five significant figures. Therefore, the final answer is: 15.7025.
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4. Pipettes used for the transfer of samples of solutions are always rinsed with a small portion of the solution before the actual sample is taken. Calculate the percent error likely to arise in an experiment if 5-mL, 10-mL, and 25-mL pipettes are used for transfer and each pipette contains 5 drops of water adhering to the inside of the barrel. A single drop of water has a volume of approximately 0.05 mL.
The experiment employing these pipettes would most likely have a 5% error rate.
We use percent error because?When your estimate aims at a known, accurate figure, percent error is a useful metric. Use it to measure how near an estimate is to the actual value, in general. When an approximation value is near to the true value, there are fewer mistakes.
What does percent error for percentages mean?The percent error is the distinction between the estimated value and the actual value in relation to the actual value. In other words, the relative error is multiplied by 100 to calculate the percent error.
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25.
A 500.0-gram sample of copper is initially at 25 °C. It absorbs 6.30 kJ of heat from its surroundings. What is
its final temperature, in °C? (Specific heat = 0.385 J/g °C for copper)
57.7 °C
41.4 °C
7.72 °C
65.7 °C
29 9 °C
The final temperature with Specific heat = 0.385 J/g °C for copper is 57.7 °C.
What is Specific heat?Specific heat is a measure of the amount of heat energy required to raise the temperature of a unit mass of a substance. It is a physical property of a material and is usually measured in units of J/(g °C) or J/(g K).
Equation:q = m * c * ΔT
where q is the heat absorbed (in joules), m is the mass of the substance (in grams), c is the specific heat (in J/(g °C)), and ΔT is the change in temperature (in °C).
Plugging in the values,
6.30 kJ = 500.0 g * 0.385 J/(g °C) * ΔT
Simplifying the equation, we get:
ΔT = (6.30 kJ) / (500.0 g * 0.385 J/(g °C))
ΔT = 32.7 °C
The final temperature of the copper is as follows:
25 °C + 32.7 °C = 57.7 °C
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use the balance equation for the haber process, repeated below N2(g)+3H2(G)=2NH3(G)
How many moles of ammonia are produced when 5.0 moles of hydrogen reacts with excess nitrogen
The moles of the ammonia that is produced is 3.33 moles.
What is the number of moles?Stoichiometry is an important tool in chemical analysis, and it is used in a wide range of industries, including pharmaceuticals, materials science, and environmental science.
The balanced reaction equation in this case can be given as;
[tex]N_{2} (g)+3H_{2} (g)--- > 2NH_{3} (g)[/tex]
If 3 moles of hydrogen produces 2 moles of ammonia
5 moles of hydrogen will produce 5 * 2/3
= 3.33 moles
Thus we have 3.33 moles of ammonia.
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