Question 1

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?

Accepted Answer

0.213 J/g °C

Answer

4.68 J/g °C

Answer

1200 J/g °C

Answer

0.480 J/g °C

Question 2

What does 'q' represent in the q=mcΔT formula?

Accepted Answer

Heat energy

Answer

Force

Answer

Mass

Answer

Velocity

Question 3

What does 'c' represent in the q=mcΔT formula?

Accepted Answer

Specific heat

Answer

Coefficient of friction

Answer

Speed of light

Answer

Concentration

Question 4

Open the image below and respond to the question:

Accepted Answer

+53 kJ

Answer

+73 kJ

Answer

-73 kJ

Answer

-53 kJ

Question 5

Open the image below and answer the question:

Accepted Answer

-168 kJ

Answer

-8kJ

Answer

+168 kJ

Answer

+8 kJ

Question 6

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?

Accepted Answer

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.

Answer

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.

Answer

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.

Answer

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.

Question 7

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?

Accepted Answer

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.

Answer

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.

Answer

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.

Answer

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.

Question 8

Examine the image below: what type of reaction does the energy profile diagram represent? (read the options very carefully)

Accepted Answer

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

Answer

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

Answer

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

Answer

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

Question 9

Examine the image below: what type of reaction does the energy profile diagram represent? (read the options very carefully)

Accepted Answer

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

Answer

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

Answer

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

Answer

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

Question 10

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

Accepted Answer

1290 J

Answer

80.75 J

Answer

770.52 J

Answer

129 J

Question 11

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

Accepted Answer

248 g

Answer

0.0995 g

Answer

2010 g

Answer

10.05 g

Question 12

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?

Accepted Answer

0.148 J/g°C

Answer

2312 J/g°C

Answer

6.75 J/g°C

Answer

1.48 J/g°C

Question 13

How much heat is needed to raise the temperature of 200 g of zinc from 35.0°C to 45.0°C? (c_zinc= 0.388 J/g°C)

Accepted Answer

776 J

Answer

77.6 j

Answer

0.0194 J

Answer

5155J

Question 14

How much heat is needed to raise the temperature of 118 g of octane from 67.0°C to 87.0°C? (c_octane=2.22 J/g°C)

Accepted Answer

5239 J

Answer

2.65 J

Answer

0.0763 J

Answer

0.376 J

Question 15

What mass of titanium would have its temperature raised from 10.8˚C to 20.8˚C with the addition of 1000J of heat? (c _Ti= 0.544 J/g˚C)

Accepted Answer

184 g

Answer

544 g

Answer

54.4 g

Answer

5440 g

Question 16

When 1000J of energy is added to 100 g of a metal rod at 40.0 °C, the temperature increases to 50.0°C. What is the specific heat of the metal?

Accepted Answer

1. 00 J/g°C

Answer

0.1  J/g°C

Answer

10. 0 J/g°C

Answer

0.250 J/g°C

Question 17

Which of the follow has a +q?

Accepted Answer

The melting of a piece of chocolate

Answer

The combustion of propane gas

Answer

The condensation of water vapor to form dew on leaves

Answer

The freezing of a water to form ice cubes

Question 18

Which of the follow has a -q?

Accepted Answer

The combustion of gasoline

Answer

The melting of a block of ice

Answer

The heating of a pot of water to produce water vapor

Answer

The sublimation of dry ice to form CO₂ gas.

Question 19

How much heat is needed to raise the temperature of 2.57g of ethanol by 49.1°C? (c_ethanol=2.4 J/g°C)

Accepted Answer

302.8 J

Answer

218 J

Answer

2.18 J

Answer

0.0797 J

Question 20

What mass of magnesium would have its temperature raised from 15.0˚C to 75.0˚C with the addition of 1000J of heat? (c _Mg= 1.05J/g˚C)

Accepted Answer

15.9 g

Answer

0.63 g

Answer

97.13 g

Answer

63000 g

Question 21

When 10000J of energy is added to 1550 g of a metal rod at 40.0 °C, the temperature increases to 90.0°C. What is the specific heat of the metal?

Accepted Answer

0.129 J/g°C

Answer

1.50 J/g°C

Answer

7.75 J/g°C

Answer

1.00 J/g°C

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