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Unit 8 Thermochemistry Formative 2026--bhs

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Last updated 1 day ago
18 questions
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Question 1
1.

List the coefficients that balance this equations.

Separate with commas and NO spaces

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Question 4
4.

List the coefficients that balance this equations.

Separate with commas and NO spaces

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Given: A reaction has a △H of -22.0 KJ/mol and a △S of 250.0 J/mol at 23°C.
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Given: C2H4 + H2 --> C2H6

â–³H = -136.9 kJ/mol
â–³S = 120.7 J/mol
T = 25°C
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Question 11
11.

A 13000 kg sample of metal absorbs 10305.2 J of energy, and its temperature changes from 50.0°C to 125°C. Calculate the specific heat of the metal.

Include units.

Question 12
12.

The specific heat of copper is 0.385 j/g/°C. How much energy is needed to raise the temperature of 7.80 lbs of copper from 50.0°C to 105°C? (1lb = 453.6 g)

Include units.

Question 13
13.

The specific heat of aluminum is 0.900 J/g/°C. If 23450 J energy is needed to raise the temperature from 35.0°C to 65.0°C, what is the mass of aluminum with a specific heat of 0.900 J/g°C?

Include units

Question 14
14.

A 45.00 g sample of ice at -35.00°C is heated to steam at 100.0°C. Calculate the energy required for this change.

Include units.

Question 15
15.

A 9.00 g sample of water was raised from 45.0°C to steam at 100.0°C. What is the energy required for this change?

Include units.

Question 16
16.

What energy is required to melt a 3.5 g sample of ice at -5.0°C to 45.0°C?

Include units.

Question 17
17.

A calorimeter holds 1750.0 mL of water at 77.0°C. When it cools, the temperature drops to 15.0°C. How many calories are lost from the water?

Include units. 1g = 1mL

Question 18
18.

A 3500 mL sample of water was in a calorimeter at 15.0°C. If 35000. cal are applied, what is the final temperature?

Include units. 1g = 1mL

Question 2
2.

What is â–³H for the reaction given enthalpy of each compound?

Include units and round to FOUR sig figs.

Question 3
3.

Question 5
5.

What is â–³H for the reaction given enthalpy of each compound?

Include units and round to FIVE sig figs.

Question 6
6.

Question 7
7.

Calculate â–³G for this information.

Include Units and round to TWO sig figs.

Question 8
8.

Question 9
9.

What is Gibb's free energy given this information?

Include units and round to THREE sig figs.

Question 10
10.

What type of reaction is it?
exothermic
endothermic
What type of reaction is it?
exothermic
endothermic
What type of reaction is this?
Non spontaneous, endothermic
Spontaneous, exothermic
Spontaneous, endothermic
Non spontaneous, exothermic
What type of reaction is this?
spontaneous, exothermic
non spontaneous, exothermic
spontaneous, endothermic
non spontaneous, endothermic