Answer:
The simplest Organic compounds are made up of only Carbon and Hydrogen atoms only. Compounds of Carbon and Hydrogen only are called Hydrocarbons.
Explanation:
In Fig C, which pair of electrons is the lone pair?
H:P:H
Fig C
H
O Top
O Left
Bottom
O Right
Answer:
bottom right top left fig
9. Using the balanced equation from Question #8, how many grams of lead will be produced if 2.54 grams of PbS is burned with 1.88 g of O2? Express your answer to the correct number of significant figures and you must show all work in the form of dimensional analysis as shown in Lesson 4. (Hint: be sure to work the problem with both PbS and O2).
Answer: 2.24 grams of Pb
Explanation:
Step 1
Balanced chemical reaction;
2PbS + 3O2 → 2Pb + 2SO3
Step 2
Moles of both PbS and O2
Moles = mass / molar mass
Moles of PbS = 2.54 g / 239.3 g/mol = 0.0108 moles
Moles of O2 = 1.88 / 32 g/mol = 0.0588 moles
Step 3
Finding the limiting reactant.
Limiting reactant, is that reactant which is completely used in the reaction;
If we assume that PbS is the limiting reactant;
We have 0.0588 moles of O2. This needs ( 0.0588 * 2) / 3 = 0.0392 moles of PbS to fully react. But we have only 0.0108 moles of PbS available. That means that the PbS will be completely consumed hence the limiting reactant
If we assume O2 is the limiting reactant;
We have 0.0108 moles of PbS. That needs ( 0.0108 * 3) / 2 = 0.0162 moles of O2. But we have 0.0588 moles of O2 which is in excess further confirming that PbS is the limiting reactant since it will be depleted in the reaction.
Step 4
Moles of lead
For this step we apply the mole ratios with the limiting reactant;
Mole ratio of PbS : Pb = 2 : 2 = 1 : 1
Therefore;
Moles of Pb = (0.0108 moles * 1 ) 1
Moles of Pb =0.0108 moles
Step 5
Mass of Pb
Mass = moles * molar mass
Mass of Pb =0.0108 moles * 207.2 g/mol
Mass of Pb = 2.24 grams
what is Newton's second law of motion
Answer:
Newton's second law of motion is F = ma, or force is equal to mass times acceleration.
Explanation:
Answer:
F= m x a
force = mass x acceleration
Explanation:
The second law states that the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object. The acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object. As the force acting upon an object is increased, the acceleration of the object is increased.
what is the mass percentage of Li2CO3
Answer: its supposed to be 18.78%.
Explanation:
What do ferns and gymnosperms have in common?They are all vascular plants.
Reproduction depends on birds, bees, and other animals.
They all produce seeds.
They depend on water for fertilization.
Answer:
They are all vascular plants.
Explanation:
Vascular plants, also known as tracheophytes, are highly advanced plant creatures with leaves, stems, and roots, as well as a vascular system made up of conducting vessels. Ferns are herbaceous, pteridophytic vascular plants that do not produce flowers or seeds. Gymnosperms are vascular plants that produce seeds but do not produce blooms. Because the seeds aren't covered or protected by an ovary, they can be seen on the plant's leaves or other components. Angiosperms are flowering plants containing seeds that develop inside the ovary, which develops and produces fruit.
Answer:
They all produce seeds
Explanation:
Write the balanced NET ionic equation for the reaction when ZnI₂ and Pb(ClO₄)₂ are mixed in an aqueous solution.
Answer:
The total ionic equation is:
3 Na+ + PO4-3 + 3H+ + 3Cl- --> H3PO4 + 3Na+ + 3 Cl-
And the net ionic equation is:
3H+ + PO4-3 --> H3PO4
Which solution would have the highest concentration of [H+] ions?
O a solution with a pH of 8
O a solution with a pH of 12
O a solution with a pH of 10
a solution with a pH of 6
what is an important role that fish have in our universe?
Answer:
Answer:Fish play an important role in nutrient cycles because they store a large proportion of ecosystem nutrients in their tissues, transport nutrients farther than other aquatic animals and excrete nutrients in dissolved forms that are readily available to primary producers.
Answer this question lol
Thermal energy transfer lab report.
I need answers for questions 1-11.
If you cannot answer every question, that is ok. I just need the help. Here are the questions.
1. What is the purpose of the lab, the importance of the topic, and the question you are trying to answer?
2. What is your hypothesis (or hypotheses) for this experiment?
3. What methods are you using to test this (or each) hypothesis?
4. Locate the data and observations collected in your lab guide. What are the key results? How would you best summarize the data to relate your findings?
5. Do you have quantitative data (numerical results or calculations)? Do you have qualitative data (written observations and descriptions)? How can you organize this date for your report?
6. What do the key results indicate?
7. If you constructed graphs, what trends do they indicate in your data?
8. Were there any problems with the experiment or the methods? Did you have any surprising results?
9. What do the results tell you about your hypothesis(es)?
10. How do the data support your claim above?
11. If you could repeat the experiment and make it better, what would you do differently and why?
Thermal energy flows from hot to colder bodies and is determined by the process of calorimetry.
What is thermal energy?Thermal energy is the energy transfer process which occurs as a result temperature difference between two bodies.
Thermal energy flows from hot to colder bodies.
The quantity of Heat transfer is determined using a calorimeter.
The calorimeter works on the principle of conservation of energy. The principle of the calorimeter is stated as follows:
Heat lost = Heat gainedThe quantity of Heat, q = mass × specific heat capacity × temperature difference
Therefore, it can be concluded that thermal energy flows from hot to colder bodies.
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Answer:
I did this earlier, here's what I put.
How many kilojoules are required to melt 15 g of ice at 0 degrees C, and raise the temperature of the liquid that forms to 85 degrees C?
Answer:
10026 joules
Explanation:
its right.
Which color object would be the hottest? A violet object, a red object or a green object? Why?
Answer:
A Violet object
Explanation:
An Violet object attracts the heat after white objects, followed by orange, yellow, green, blue, indigo and violet, which attracts the most heat of any visible color other than black.
(07.01 MC)
A potential energy diagram is shown.
200
Potential Energy (kJ)
150
Reactants
100
Products
50
0
Reaction Pathway
What is the activation energy of this reaction? (5 points)
O 50 kJ
100 kJ
O 150 kJ
O 200 kJ
By subtracting the energy at the highest point of the diagram from the energy of the reactants we obtain the activation energy.
What is a potential energy diagram?A potential energy diagram is a diagram that shows the energy of the reactants as well as that of the products. Even though the diagram is not shown here but we know that the actvation energy is shown by the energy difference between the highest point on the reaction profile and the energy of the reactants.
Hence, by subtracting the energy at the highest point of the diagram from the energy of the reactants we obtain the activation energy.
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Answer:
The answer would be 100 kJ
Explanation:
I took the quiz
An alternating current can be described as one in which:
A. Electrons flow in both directions in the circuit.
B. Electrons flow in only one direction in the circuit
C. Electrons move only from the negative terminal of the battery.
D. Electrons move only from the positive terminal of the battery.
A
Explanation:
electrons flow in both directions
Answer: A I know it but I forgot how to explain it.
What is the mass in grams of 5.2 x 1028 atoms of manganese (Mn)?
The mass, in grams, of 5.2 x 10^28 atoms of manganese would be 0.0006833 grams
Mass calculationAccording to Avogadro, 1 mole of any substance contains 6.022 x [tex]10^{23}[/tex] atoms.
Thus, how many moles would be in 5.2 x [tex]10^{28}[/tex]atoms of Mn:
= 6.022 x [tex]10^{23}[/tex] /1 x 5.2 x [tex]10^{28}[/tex]
= 0.00001158 moles
Mass of 0.00001158 moles Mn = 0.00001158 x 54.9
= 0.0006833 grams
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What is internal pressure?
What is the pOH of a
2.6 x 10-6 M H+ solution?
Explanation:
pOH=-log(2.6×10^(-6)
we get around 5.59
(using log)
Which kind of wave is formed when a transverse wave and a longitudinal wave combine?
A a surface wave
B an electromagnetic wave
C a sound wave
D a radio wave
The kind of wave that is formed when a transverse wave and a longitudinal wave combine is surface wave.
What is surface wave?A surface wave is a mechanical type of wave that propagates along the boundary between two different media.
How surface waves formWhen a mechanical wave travels at the interface between two media, a transverse wave and a longitudinal wave can combine to form a surface wave.
An example can be seen in ocean waves.
Thus, the kind of wave that is formed when a transverse wave and a longitudinal wave combine is surface wave.
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How can we increase the surface area of reactants?
add a catalyst
O place them in a flame
dissolve them in water
o add more particles to the solution
Answer:
O place them in a flame dissolve them in water o add more particles to the solution.
From the reaction: B2H6 + O2 HBO2 + H2O a. What mass of O2 will be needed to burn 36.1 g of B2H6? b. How many moles of water are produced from 19.2 g of B2H6?
A. The mass of O₂ needed to burn 36.1 g of B₂H₆ is 123.77 g
B. The number of mole of water, H₂O produced from 19.2 g of B₂H₆ is 1.372 mole
Balanced equationB₂H₆ + 3O₂ —> 2HBO₂ + 2H₂O
Molar mass of B₂H₆ = (2×11) + (1×6) = 28 g/mol
Mass of B₂H₆ from the balanced equation = 1 × 28 = 28 g
Molar mass of O₂ = 2 × 16 = 32 g/mol
Mass of O₂ from the balanced equation = 3 × 32 = 96 g
SUMMARY
From the balanced equation above,
28 g of B₂H₆ required 96 g of O₂
A. How to determine the mass of O₂ neededFrom the balanced equation above,
28 g of B₂H₆ required 96 g of O₂
Therefore
36.1 g of B₂H₆ will require = (36.1 × 96) / 28 = 123.77 g of O₂
Thus, 123.77 g of O₂ is required for the reaction
B. How to determine the mole of water producedWe'll begin by calculating the number of mole of in 19.2 g of B₂H₆. This can be obtained as follow:
Mass of B₂H₆ = 19.2 g Molar mass of B₂H₆ = 28 g/mol Mole of B₂H₆ =?Mole = mass / molar mass
Mole of B₂H₆ = 19.2 / 28
Mole of B₂H₆ = 0.686 mole
Finally, we shall determine the number of mole of water produced. This is illustrated below:
Balanced equationB₂H₆ + 3O₂ —> 2HBO₂ + 2H₂O
From the balanced equation above
1 mole of B₂H₆ reacted to produce 2 moles of H₂O
Therefore, H₂O
0.686 mole of B₂H₆ will react to produce = 0.686 × 2 = 1.372 mole of H₂O
Thus, 1.372 mole of H₂O was obtained from the reaction
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What are the elements names for C9H8O4
Looking at the figure, the overall (SiO4) molecule, which forms the common mineral quartz, has a tetrahedral shape. It is probably a:
non-polar molecule
polar molecule
non-polar molecule because the chemical formula is in a tetrahedral form(O4) and the (Si) is in the centre. I hope this will help you
Which statement describes a digital signal?
Answer:
digital signal
Answer:
Its made of numbers
Explanation:
did the assignment, hope this helps :]
Which would lower the reaction rate?
A. Increasing the concentration of reactants.
B. Increasing the temperature of the system.
C. Raising the value of k.
D. Decreasing the temperature of the system.
Answer:
D. Decreasing the temperature of the system
Explanation:
An ideal gas exerts a pressure of 3atm in a 3L container. The container is at a temperature of 298K.
What will be the final pressure if the volume of the container changes to 2L?
Possible Answers:
4.5atm
2atm
4atm
3.5atm
Given:
Initial pressure P1 = 3 atm
Initial volume = 3L
Temperature (constant)= 298 K
final volume V2 = 2L
To find:
Final pressure P2 = ?
Solution:
According to Boyle's Law,
P1V1 = P2V2
3×3 = 2 × P2
P2 = 9/2
P2 = 4.5 atm
[tex]{Answer = 4.5 atm}[/tex]
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How much energy is needed to completely boil a 5.05g sample of water?
Set up a cell that has a Mg electrode in a 1.0 M aqueous Mg2+ solution on the left side and a Cu electrode in a 1.0 M aqueous Cu2+ solution on the right side. Add the salt bridge. What is the balanced net ionic equation for this reaction? Include physical states.
The cell notation is; Cu^2+(aq)/Cu(s)//Mg(s)/Mg^2+(aq). The standard cell notation helps us to write the cell equation easily.
What is electrochemical cell?The electrochemical cell involves the transformation of chemical energy to electrical energy in an electrochemical cell. The two electrodes involved are the cathode and the anode.
In this case, the Mg is the anode and the Cu is the cathode hence the cell notation is; Cu^2+(aq)/Cu(s)//Mg(s)/Mg^2+(aq).
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Suppose that a car's starter motor draws 221 A of current for 6.20 s to start the car. What mass of Pb is oxidized in the lead–acid battery to supply this much electricity?
1.47 grams
Actually, I figured it out., here is the answer in case anyone is wondering:
It has two electrons in the process and Q is 1370.2 (Q= I*T= 221*6.2=1370.2) this gets to 1370.2/192736 (the number on the denominator is due to that fact that there are two electrons involved) That equals 0.007 Mols, and then using the grams per mol from the periodic table for lead, we get that value is equal to 1.47 grams.
The lead acid battery produces energy by oxidation of lead. The amount of lead oxidized in this case is 1.47 g.
What is lead acid battery?The lead acid battery is the common accumulator that we have in use. It is made up of a cell that contains lead electrodes in an acid.
The oxidation of lead occurs according to thr equation;
Pb(s) ----> Pb^2+(aq) + 2e
If 207 g of Pb is oxidized by 2(96500)C
x g of lead is oxidized by (221 * 6.20) C
x = 207 g * (221 * 6.20) C/2(96500)C
x = 1.47 g
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Hellpp I don’t understand this
Answer:
Can you repost this but flip it? It’s upside down rn
Explanation:
What happens when an electron jumps energy from energy level 3 energy level 6 in an atom
Explanation:
high energy to Low energy
=the electron gains energy (K.E)