CHEMISTRY HIGH SCHOOL

Which statement best explains the change that occurs when gas particles move more slowly

Answers

Answer 1
Answer:

Answer:

Condensation/Sublimation

Explanation:

When gas particles move more slowly they're losing energy, which means it's changing state to either a solid or liquid.
Answer 2
Answer:

Answer:

C) The temperature decreases because the average kinetic energy decreases.

Explanation:

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3. 56 g of N₂ reacts 9 g of H₂ in a closed vessel to form NH3. Which reactant is left in excess and how 2207 much? 1) N₂, 10. g +3th = 2013/ (3) N₂, 14 g (2) H₂, 4 g (4) H₂,3 g N₂- to d A​

Answers

Answer:  the reactant left in excess is H₂, and the amount of excess H₂ is 4.5 moles - 3 moles = 1.5 moles.

Explanation: Moles of N₂ = mass of N₂ / molar mass of N₂

Moles of N₂ = 56 g / 28 g/mol = 2 moles

Moles of H₂ = mass of H₂ / molar mass of H₂

Moles of H₂ = 9 g / 2 g/mol = 4.5 moles

A car traveled at an average speed of 60 mph for two hours. How far did it travel? A.
30 miles

B.
60 miles

C.
120 miles

D.
150 miles
i need help and please answer

Answers

C-120 hope this helps
C.)  Average speed = total distance/total time. Total time= avg speed x time = 60x2 = 120miles.

Is BH2F a gas or a liquid and what is the boiling point

Answers

Hey I tried but could not find your answer, but maybe you could try to calculate the average of bpts of the different elements in the compound to find the boiling point. And when you know the bpt, you can find out whether it is a liquid or gas. But after searching a lot, I found it was a solid. Good luck!

Which ion was fomed by providing the second ionization to remove an electron A) ca2+ B)N3- B)Fe3+ C)S2

Answers

The ion that is formed by providing the second ionization to remove an electron is N3-. The answer is letter B. The rest of the choices do not answer the question above.

Answer:

A.) CA2+

Explanation:

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All of the following need to be present for a plant to do photosynthesis except light

water

oxygen

carbon dioxide

Answers

Oxygen is a by-product of photosynthesis thus it is not needed for photosynthesis to occur.  

Light is needed to provide the energy needed as photosynthesis is endothermic and is also needed to ionise the water molecule to get hydroxide and hydrogen ions and carbon dioxide is what is reduced to starch.

student has calibrated his/her calorimeter and finds the heat capacity to be 14.2 J/°C. S/he then determines the molar heat capacity of aluminum. The data are: 25.5 g Al at 100.0°C are put into the calorimeter, which contains 99.0 g H2O at 18.6°C. The final temperature comes to 22.7°C. Calculate the heat capacity of Al in J/mol·°C.

Answers

Answer:

24.03 J/mol.ºC

Explanation:

For a calorimeter, the heat lost must be equal to the heat gained from water plus the heat gained from calorimeter, which has the same initial temperature as the water.

-Qal = Qw + Qc (minus signal represents that the heat is lost)

-mal*Cal*ΔTal = mw*Cw*ΔTw + Cc*ΔTc

Where m is the mass, C is the specific heat, ΔT is the temperature variation, al is from aluminum. w from water and c from the calorimeter. Cw = 4.186 J/gºC

-25.5*Cal*(22.7 - 100) = 99.0*4.186*(22.7 - 18.6) + 14.2*(22.7 - 18.6)

1971.15Cal = 1699.10 + 58.22

1971.15Cal = 1757.32

Cal = 0.89 J/g.ºC

The molar mass of Al is 27 g/mol

Cal = 0.89 J/g.ºC * 27 g/mol

Cal = 24.03 J/mol.ºC
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