  Thermochemistry Exam Review 2g, 6a, 6b

Quiz by Darrien James

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Correct quiz answers unlock more play!  12 questions
• Q1
If a 50 g piece of an unknown metal is heated from 25 °C to 100 °C and absorbs 800 J of heat, what is the specific heat of aluminum?
4.68 J/g °C
1200 J/g °C
0.480 J/g °C
0.213 J/g °C
30s
• Q2
What does 'q' represent in the q=mcΔT formula?
Force
Mass
Heat energy
Velocity
30s
• Q3
What does 'c' represent in the q=mcΔT formula?
Coefficient of friction
Speed of light
Concentration
Specific heat
30s
• Q4

Open the image below and respond to the question: +73 kJ

-73 kJ

-53 kJ

+53 kJ

30s
• Q5

Open the image below and answer the question: -168 kJ

-8kJ

+168 kJ

+8 kJ

30s
• Q6

Examine the table:

A 5g ring of each  metal was heated with 100J of energy, which of the  four metal rings will have the greatest temperature change? The titanium ring, because it has the highest specific heat, therefore it requires the least energy to increase the temperature of the ring by 1°C.

The tin ring, because it has the lowest specific heat, therefore it requires the least energy to increase the temperature of the ring by 1°C.

The platinum ring, because it has the lowest specific heat, therefore it requires the least energy to increase the temperature of the ring by 1°C.

The titanium ring, because it has the highest specific heat, therefore it requires the most energy to increase the temperature of the ring by 1°C.

30s
• Q7

Examine the table:

A 5g ring of each  metal was heated with 100J of energy, which of the  four metal rings will have the least temperature change? The titanium ring, because it has the highest specific heat, therefore it requires the most energy to increase the temperature of the ring by 1°C.

The titanium ring, because it has the highest specific heat, therefore it requires the least energy to increase the temperature of the ring by 1°C.

The platinum ring, because it has the lowest specific heat, therefore it requires the least energy to increase the temperature of the ring by 1°C.

The tin ring, because it has the lowest specific heat, therefore it requires the least energy to increase the temperature of the ring by 1°C.

30s
• Q8

Examine the image below: what type of reaction does the energy profile diagram represent? (read the options very carefully) An exothermic reaction because the energy of products is lower than the energy of the reactants therefore, ΔH is negative and  energy is released.

An endothermic reaction because the energy of products is lower than the energy of the reactants therefore, ΔH is positive and  energy is absorbed.

An endothermic reaction because the energy of products is lower than the energy of the reactants therefore, ΔH is positive and  energy is released.

An exothermic reaction because the energy of products is lower than the energy of the reactants therefore, ΔH is negative and  energy is absorbed.

30s
• Q9

Examine the image below: what type of reaction does the energy profile diagram represent? (read the options very carefully) An endothermic reaction because the energy of products is higher than the energy of the reactants therefore, ΔH is positive and  energy is absorbed.

An exothermic reaction because the energy of products is lower than the energy of the reactants therefore, ΔH is negative and energy is released.

An exothermic reaction because the energy of products is higher than the energy of the reactants therefore, ΔH is negative and energy is released.

An endothermic reaction because the energy of products is lower than the energy of the reactants therefore, ΔH is positive and  energy is released.

30s
• Q10

How much heat is needed to raise the temperature of 1000 g of lead from  15.0°C to 25.0°C? (clead= 0.129 J/g°C)

80.75 J

770.52 J

129 J

1290 J

30s
• Q11

What mass of barium would have its temperature raised from 65.0˚C to 85.0˚C with the addition of  1000J of heat? (cbarium= 0.201J/g˚C)

0.0995 g

2010 g

248 g

10.05 g

30s
• Q12

When 185J of energy is added to 125 g of a silicon sample at 45.0 °C, the temperature increases to 55.0°C.  What is the specific heat of the silicon sample?

0.148 J/g°C

2312 J/g°C

6.75 J/g°C

1.48 J/g°C

30s

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