Answer: [tex]3Mg(s)+2SnCl_3(aq)\rightarrow 3MgCl_2(aq)+2Sn(s)[/tex]
Explanation:
Single replacement reaction is a chemical reaction in which more reactive element displaces the less reactive element from its salt solution.
A more reactive element is one which can easily lose or gain electrons as compared to the other element.
As Magnesium is more reactive than tin, it can easily displace tin from its salt solution [tex](SnCl_3)[/tex] and form magnesium chloride and tin in elemental form.
The balanced chemical equation is:
[tex]3Mg(s)+2SnCl_3(aq)\rightarrow 3MgCl_2(aq)+2Sn(s)[/tex]
If you start with 4 moles of iron and 3 moles of oxygen to produce iron oxide, what is the limiting reagent? (You will need to balance the equation first.) Fe + O2 -> Fe2O3
A. they are equal
B.Fe
C. O2
D.Fe2O3
The correct statement regarding the limiting reactant for the reaction between 4 moles of iron and 3 moles of oxygen is: They are both equal. (Option A)
Balanced equationWe'll begin by writing the balanced equation for the reaction between iron and oxygen. This is given below:
4Fe + 3O₂ --> 2Fe₂O₃
SUMMARY
From the balanced equation above,
4 moles of Fe reacted with 3 moles of O₂
How to determine the limiting reactantThe limiting reactant is the reactant that is consumed completly in a chemical reaction.
The limiting reactant can be obtain as illustrated below:
From the balanced equation above,
4 moles of Fe reacted with 3 moles of O₂
From the illustration above, we can see that 3 moles of Fe required 4 moles of O₂ for complete reaction.
Thus, Fe and O₂ are both the limiting reactant.
Therefore, we can conclude that Fe and O₂ are equal
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S + 6 HNO3 --> H₂SO4 + 6 NO₂ + 2 H₂O In the above equation how many moles of H₂SO4 can be made when 7 moles of HNO3 are consumed?
Answer:
1.17 moles H₂SO₄
Explanation:
To find the moles H₂SO₄, you need to multiply the given value by the mole-to-mole ratio. This ratio is made up of the coefficients of the relevant molecules from the balanced chemical equation. It is important to arrange the ratio in a way that allows for the cancellation of units.
S + 6 HNO₃ ------> 1 H₂SO₄ + 6 NO₂ + 2 H₂O
^ ^
7 moles HNO₃ 1 mole H₂SO₄
----------------------- x ------------------------ = 1.17 moles H₂SO₄
6 moles HNO₃
What is the name of Pb(NO3)2? Explain how you determined the bond type and the steps you used to determine the naming convention for the compound.
The name of Pb(NO3)2 of is Lead II trioxonitrate V
The bond which exist in is Lead II trioxonitrate V ( Pb(NO3)2 ) are both ionic and covalent bond
What is a compound?A compound is a substance which contains two or more elements chemically combined together
So therefore, the name of Pb(NO3)2 of is Lead II trioxonitrate V
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What would the pH of a solution that had a hydroxide ion concentration of 1 x 10-2 M be?
Taking into account the definition of pH and pOH, the pH of the solution is 12.
Definition of pHpH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.
The pH is defined as the negative base 10 logarithm of the activity of hydrogen ions, that is, the concentration of hydrogen ions or H₃O⁺:
pH= - log [H⁺]= - log [H₃O⁺]
Definition of pOHSimilarly, pOH is a measure of hydroxyl ions in a solution and is expressed as the logarithm of the concentration of OH⁻ ions, with the sign changed:
pOH= - log [OH⁻]
Relationship between pH and pOHThe following relationship can be established between pH and pOH:
pOH + pH= 14
pH in this caseA solution had a hydroxide ion concentration of 1×10⁻² M. In other words [OH⁻]= 1×10⁻² M.
Replacing in the definition of pOH, it is calculated as:
pOH= - log (1×10⁻² M)
Solving;
pOH= 2
Replacing in the relationship established between pH and pOH, the pH can be calculated as:
pH + 2= 14
Solving:
pH= 14 - 2
pH= 12
In summary, the pH of the solution is 12.
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Determine the molecular shape of each of the following species.
Answer:
See-saw
Explanation:
To determine the molecular shape of BrF₄⁺, you need to
1.) Calculate the valence electrons of BrF₄⁺
----> Add the valence electrons of each individual atom
----> Take the positive charge into account (subtract 1 electron)
2.) Draw the Lewis Dot diagram of BrF₄⁺
----> Each bond has 2 electrons
----> Bromine can have an expanded octet
3.) Determine the molecular shape of BrF₄⁺
The valence electrons found in metallic bonds are different from other bonds
because
A. their valence electrons are immobile
B. they allow for the conductivity of electricity
c. they're able to share electrons with other atoms
D. their valence electrons are free-roaming
SUBMIT
Answer:
D.) their valence electrons are free-roaming
Explanation:
Metals tend to arrange themselves in crystalline structures once they form metallic bonds. The electrons around the positive nuclei are delocalized, and thus freely float within the structure. This is unique to metallic bonding.
Room temperature is approximately 20°C for scientific purposes. A hot pan on a stove can reach temperatures up to about 260°C. Given this information, what can you conclude about the melting points of sugar and salt?
The melting points of sugar and salt are above 20°C.
What is melting point?The melting points of substances refer to the temperature at which solid substances gain enough energy to become liquids.
The room temperature is approximately 20°C. At this temperature, sugar and salt are solids. This means that the melting temperature of both substances is above 20°C.
More specifically, sugar will melt around 180 °C while salt will melt at a temperature slightly above 800 °C.
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Because of a scarcity of workers in the New World, persons were transported against their will to work on large farms without pay and under difficult conditions. Which of the following best describes this?
British indentured servant
Enslaved African
Spanish conquistador
French fur trapper
Enslaved African is best described as the condition which involved transporting people against their will to work on large farms without pay.
What is Slavery?This is referred to a situation in which an individual is owned by another. Slaves were moved from Africa against their will to work on large farms.
They weren't given any pay and worked under hard conditions thereby making option B the correct choice.
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C4H4N2 lewis structure and formal charges minimized
The molecule is composed of two nitrogen atoms above and below the plane of four carbon atoms to which four hydrogen atoms are attached.
What is Lewis structure?The Lewis structure shows the arrangement of electrons in atoms of molecules. The molecule C4H4N2 is called pyrazine. It is composed of two nitrogen atoms above and below the plane of four carbon atoms to which four hydrogen atoms are attached.
The structure of the molecule C4H4N2 in which formal charges are minimized is shown in the image attached to this answer.
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pls help question is above
a. The calories increase by 9:00 whenever the running speed goes up by two. so so if a dog were running at 10 km/h it would be 54 calories burnt
b. they are multiplied by 9
How to convert butanoic acid to propanamide?
Butanoic acid is converted to propanamide by first converting it to propanoic acid, then ammonium propanoate and then finally propanamide by heating.
How are carboxylic acids converted to amides?Carboxylic acids are converted to amides by converting them into into an ammonium salt which then produces an amide on heating.
The ammonium salt is prepared by adding ammonium carbonate to an excess of the acid. The ammonium salt is then heated to give the amide
Therefore, butanoic acid is converted to propanamide by first converting it to propanoic acid, then ammonium propanoate and then finally propanamide by heating.
In conclusion, carboxylic acids are converted to amides in two steps.
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Lactic acid has a pKa of 3.08. What is the approximate degree of dissociation of a 0.35 M solution of lactic acid?
The approximate degree of dissociation of a 0.35 M solution of lactic acid is 4,87%
What is degree of dissociation?The degree of dissociation is the quantity used to express the strength of a base, that is, its ability to conduct electric current, which depends on the amount of ions released in the dissociation.
The degree of dissociation (α) is another way of determining the strength of a base. It indicates the fatty acids that were released from a base when it dissociates in water.
With that being said, C stands for concentration and α is the the degree of dissociation.
Latic Acid can be written as C3H6O3
[tex]CH3Ch(OH)CO2H < -- > H^{+} + CH3CH(OH)CO2^{-}[/tex]
[tex]Ka = \frac{[H^{+}] [CH3CH(OH)CO2^{-}] }{CH#CH(OH)CO2H} = \frac{C^{2} \alpha^{2} }{C(1-\alpha )} = \frac{C\alpha ^{2} }{(1-\alpha )}[/tex]
As α is too small (1-α) can be neglected.
[tex]Ka = C\alpha ^{2} \\\\\\alpha = \sqrt[]{\frac{Ka}{C} }[/tex]
[tex]Ka = 10^{-3,08} = 8,32 .10^{-4} .10^{-4} = 0,35[/tex]
[tex]\alpha = \sqrt{\frac{ka}{C} } \\\\\alpha = \sqrt{\frac{8,32.10^{-4} }{0,35} } = 0,0487[/tex]
In this case, is possible to see that approximate degree of dissociation of a 0.35 M solution of lactic acid is 4,87%
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Identify the chirality center (sometimes called chiral atom) in each molecule. If the molecule does not contain a chirality center, select none.
The only chiral center in the molecule is carbon 4 because is attached to four different atoms or groups.
What is a chiral center?The term chiral center refers to a carbon atom that is attached to four different atoms or groups. This kind of carbon atom is able to rotate the direction of plane polarized light.
We can see from the structure of the molecule that the only chiral center in the molecule is carbon 4 because is attached to four different atoms or groups.
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Hi I need help with the Lab report for the 'Flame Lab' in edge
Flame test is a qualitative test which is used to identify the metal and metalloid ion in the sample.
What is Flame Test ?A Flame test is used to identify the metal and metalloid ion in the sample. Flame test is a qualitative test. Not every metal ion emit color when it is heated in the gas burner.
What is the Purpose of Flame test ?The purpose of flame test is used to find the identities of ions in two solutions of unknown composition by comparing the colors they produce.
What are the material used ?Bunsen Burner MatchesGlovesWeighing dishes BeakersThus from the above conclusion we can say that Flame test is a qualitative test which is used to identify the metal and metalloid ion in the sample.
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Predict the sign of the entropy change, ΔS, for the following processes. Explain the reason for each of the predictions.
I2 (s) + ½ Cl2 (g) ← → ICl (g)
3 Ag (s) + 4 HNO3 (aq) → 3AgNO3 (aq) + NO (g) + 2 H2O (l)
Cl2 (g) → Cl2 (l)
C5H12 (g) + 8 O2 (g) → 5 CO2 (g) + 6 H2O (l)
( I need the answer today before 11:59)
The sign of the entropy change, ΔS, for the following processes include:
I2 (s) + ½ Cl2 (g) ← → ICl (g) - positive3 Ag (s) + 4 HNO3 (aq) → 3AgNO3 (aq) + NO (g) + 2 H2O (l) - positiveCl2 (g) → Cl2 (l) - negativeC5H12 (g) + 8 O2 (g) → 5 CO2 (g) + 6 H2O (l) - negativeWhat is Entropy?
This is referred to the degree of randomness or disorderliness of a system and is denoted as S.
Entropy change is usually positive when solid or liquid reactant is converted into gas product and vice versa.
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When a solution of sodium hydroxide is mixed with iron (II) chloride, a green precipitate is formed. What is the balanced equation for that reaction?
The balanced chemical equation for the reaction is:
2NaOH(aq) + FeCl₂(aq) --> 2NaCl(aq) + Fe(OH)₂(s)
What is a chemical equation?Chemical equations are representations of chemical reactions using symbols and formula of the reactants and products.
The reactants are located on the left side while the products are located on the right side.
Reactants —> Products
The balancing of chemical equations follows the law of conservation of matter which states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.
How to write the balanced equationSodium hydroxide => NaOH
Iron (II) chloride => FeCl₂
2NaOH(aq) + FeCl₂(aq) --> 2NaCl(aq) + Fe(OH)₂(s)
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A neutral atom has high electronegativity.
Describe what happens to this atom during ionic bond formation.
Please get it cleared and stored into your cerebrum that a cation is formed when a neutral atom loses one or more electrons from its valence electron shell.
However too, on other hand an anion is formed when a neutral atom gains one or more electrons in its outermost electron shell.
A cation means a positive ion
An anion means a negative ion
What is electronegativity?Electronegativity is one of physical periodicity and property of elements that describes the tendency of an atom to attract electrons toward itself.
Generally, electronegativity of an atoms of elements in a particular trend is affected by both its atomic number and the distance that its valence electrons reside from the charged nuclei.
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4 and 5 pls and thank uuu
Answer:
4. -ol
5. cyclic ketone
Explanation:
biology stuff
sorry it's hard to explain
The molar heat of fusion of gold is 12.550 kJ mol–1. At its melting point, how much mass of melted gold must solidify to release 235.0 kJ of energy?
The mass of melted gold to release the energy would be 3, 688. 8 Kg
How to determine the massThe formula for quantity of energy is given thus;
Q = n × HF
Where n represents number of moles
HF represents heat of fusion
To find the number of moles, we have
235.0 = n × 12.550
number of moles = [tex]\frac{235}{12. 550}[/tex] = 18. 725 moles
Note that molar mass of Gold is 197g/ mol
Let's note that;
Number of moles = mass/ molar mass
Mass = number of moles × molar mass
Mass = 18. 725 × 197
Mass = 3, 688. 8 Kg
Thus, the mass of melted gold to release the energy would be 3, 688. 8 Kg
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Conversion factors are useful in solving problems in which a given measurement must be expressed in
a. some other unit of measure.
b. the correct precision.
c. the correct number of significant digits.
d. scientific notation.
Conversion factors are useful in solving problems in which a given measurement must be expressed in some other units of measure.
Conversion factors are helpful in solving issues where one unit of measurement needs to be expressed in another. In general, a measurement's numerical value changes when it is multiplied by a conversion factor, while the quantity being measured's real size stays the same.
A conversion factor is a number that is used to multiply or divide one set of units into another. If a conversion is required, it must be done using the correct conversion factor to get an identical value. For instance, 12 inches equals one foot when converting between inches and feet.
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In this reaction, how many grams of CH4 would be formed from 25 g C?
C + 2H2 → CH4
33.33 grams of CH4 would be formed from 25 g C.
C + 2H2 → CH4
from given reaction we can say that ,
2 moles of hydrogen is required for 1 mole of carbon and these will react to form 1 mole of methane.
atomic mass of Carbon = 12 gm
Molecular mass of H2 = 2(H)
= 2(1)
=2gm
moles = molecular mass / given mass
for C,
if 12 gm = 1 mole
then 25 gm = ? mole
=2.083 moles
1 mole of C will produce 1 moles of CH4
so, 2.083 moles of C also will produce 2.083 moles moles of CH4
molecular weight of methane= C+4(H)
= 12+4(1)
= 16 gm
amount of methane produced= moles × molecular mass
=2.083× 16
= 33.33 gm
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The protons of a __________ acid would be completely transferred to the solvent when dissolved.
Group of answer choices
inert
neutral
strong
weak
The protons of a strong acid would be completely transferred to the solvent when dissolved.
What is an acid?An acid is defined as a substance that contains hydrogen that it can donate when reacting with another substance.
There are two main types of an acid which include:
weak acids andstrong acids.A strong acid is a type of acid that has the ability to donate it's hydrogen/ protons completely in a chemical reaction.
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A gas company in Massachusetts charges $1.30 for 17.0ft³ of natural gas. Convert this rate to dollars
per liter of gas.
Answer:
See below
Explanation:
Conversion factor : 1 ft^3 = 28 .317 liters
$ 1.30 /( 17 ft^3 * 28.317 liters/ft^3) = $.0027 per liter
For the balanced equation: 2H2S + 3O2 → 2SO2 + 2H2O
How many moles of sulfur dioxide will be produced from the reaction of 12 moles of oxygen?
Answer:
8 moles SO₂
Explanation:
To find the moles SO₂, you need to multiply the given value by the mole-to-mole ratio. This ratio, between O₂ and SO₂, is made up of the coefficients from the balanced equation.
2 H₂S + 3 O₂ -----> 2 SO₂ + 2 H₂O
12 moles O₂ 2 moles SO₂
-------------------- x ---------------------- = 8 moles SO₂
3 moles O₂
How many molecules of zinc oxide are there in a 2 kg sample?
There are 1.48 × 10²⁵ molecules of zinc oxide in a 2 kg sample. Details about number of molecules can be found below.
How to calculate number of molecules?The number of molecules of a substance can be calculated by multiplying the number of moles of the substance by Avogadro's number.
According to this question, there are 2000g of ZnO in a sample. Zinc oxide has a molar mass of 81.38 g/mol.
no of moles = 2000g ÷ 81.38g/mol
no of moles = 24.57mol
number of molecules = 24.57 × 6.02 × 10²³
number of molecules = 147.95 × 10²³
Therefore, there are 1.48 × 10²⁵ molecules of zinc oxide in a 2 kg sample.
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I need help with the solution
Answer:
1
Explanation:
The empirical formula describes the simplest whole number ratio of each type of atom in a compound. To find this formula, you need to (1) convert grams of each element to moles (via their atomic masses) and then (2) find the ratio of each element (by dividing each molar value by the smallest mole value).
(Step 1)
Atomic Mass (Zn): 65.380 g/mol
Atomic Mass (C): 12.011 g/mol
Atomic Mass (O): 15.998 g/mol
10.40 grams Zn 1 mole
------------------------ x ------------------------ = 0.159 moles Zn
65.380 grams
1.92 grams C 1 mole
--------------------- x ----------------------- = 0.160 moles C
12.011 grams
7.68 grams O 1 mole
---------------------- x ------------------------ = 0.480 moles O
15.998 grams
(Step 2)
0.159 moles Zn / 0.159 = 1 atom Zn
0.160 moles C / 0.159 = 1 atom C
0.480 moles O / 0.159 = 3 atom O
The empirical formula is Zn₁C₁O₃. Therefore, the value that should be in the space is 1.
A liquid has q voulume of 34.6 mL and a mass of 46.0g ehat is the density of the liquid
Answer:
1.33 g/mL
Explanation:
The density of a substance can be calculated using the following formula:
Density = mass (g) / volume (mL)
Since you have been given both the mass and volume, you can easily calculate the density of the liquid.
Density = mass / volume
Density = 46.0 g / 34.6 mL
Density = 1.33 g/mL
18. What is assigned a rating of 3 in the yellow diamond of the NFPA 704 symbol.
OA. Helium
OB. Sodium
OC. Ammonium nitrate
OD. Chlorine dioxide
What is the pH of a 0.0100 M sodium benzoate solution? Kb (C7H5O2-, ) = 1.5 x 10^-10
A) 0.38
B) 5.91
C) 8.09
D) 9.82
E) 13.62
The pH of a 0.0100 M sodium benzoate solution with a Kb of 1.5 × 10-¹⁰ is 5.91 (option B).
How to calculate pH?The pH of a solution in chemistry refers to the notation expressing the acidity or alkalinity of a solution.
The pH is measured on a logarithmic scale of which 7 is neutral, lower values are more acid and higher values more alkaline.
The pH of a solution can be calculated using the following formula;
pH = - log {H+}
pH = - log {0.0100}
pH = 2
Therefore, the pH of a 0.0100 M sodium benzoate solution with a Kb of 1.5 × 10-¹⁰ is 5.91.
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A 3.82 g piece of limestone contains 2.62 g of CaCO3
. Based on these results, what is the mass percentage of CaCO3
in limestone?
Considering the definition of percentage by mass, the mass percentage of CaCO₃ is 68.59%.
What is mass percentageThe percentage by mass expresses the concentration and indicates the amount of mass of solute present in 100 grams of solution.
In other words, the percentage by mass of a component of the solution is defined as the ratio of the mass of the solute to the mass of the solution, expressed as a percentage.
The percentage by mass is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage. This is:
[tex]mass percentage=\frac{mass of solute}{mass of solution}x100[/tex]
Mass percentage of CaCO₃In this case, you know:
mass of CaCO₃: 2.62 gramsmass of limestone: 3.82 gramsReplacing in the definition of mass percentage:
[tex]mass percentage=\frac{2.62 grams}{3.82 grams}x100[/tex]
mass percentage= 68.59 %
Finally, the mass percentage of CaCO₃ is 68.59%.
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