Calorimetry Lab

Calorimetry is the measurement of the ___________

(Choose the best answer below.)

• transfer of heat into or out of a system (reaction/process)

• change in temperature

• amount of energy required to raise the temperature of 1 gram of the substance by 1°C.

• change in the mass of a substance throughout a reaction.

Answer explanation

Calorimetry specifically measures the transfer of heat into or out of a system during a reaction or process, making it the best answer. The other options describe related concepts but do not define calorimetry itself.

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

What material would be have the LARGEST change in temperature?

• Copper

• Carbon Steel

• Zinc

• Stainless Steel

Answer explanation

Zinc has a lower specific heat capacity compared to Copper, Stainless Steel, and Carbon Steel. Therefore, when all materials are heated with the same amount of thermal energy (10,000 J), Zinc will experience the largest change in temperature.

Tags

NGSS.MS-PS3-4

A metal cube at temperature of 70°C is immersed in water at temperature of 20°C. The metal _______ heat while the water __________ heat.

• gains, loses

• loses, gains

Answer explanation

The metal cube at 70°C is hotter than the water at 20°C. Therefore, the metal loses heat to the water, which gains that heat, leading to the correct choice: loses, gains.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

There are 2 pans of water, one has 100 mL in it and one has 1000mL. You add 4000 joules of energy,  which one has the bigger change in temperature?

• 100 mL

• 1000 mL

• They the same material so they both heat to the same temperature

• They both will cool down.

Answer explanation

The change in temperature is determined by the formula Q = mcΔT. For the 100 mL pan, with less mass, the same energy (4000 J) results in a larger temperature change compared to the 1000 mL pan.

Tags

S114021F

• exothermic reaction, absorbing the energy

• endothermic reaction, releasing the energy

• chemical reaction, destroying mass

Answer explanation

In the cheese ball lab, the cheese ball has a -Q because it was an exothermic reaction, releasing energy. The water has a positive Q because it was absorbing the energy from the cheese ball.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

NGSS.MS-PS3-4

Silver has a ​ (a)   specific heat compared to water. This means that silver changes temperature ​ (b)   than water when the same amount of heat energy is added.

• low

• high

• more

• less

Answer explanation

Silver has a low specific heat compared to water, meaning it changes temperature more than water when the same amount of heat energy is added. This indicates that silver heats up or cools down faster than water.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

A -Q means an _____reaction/process, and a +Q means an ______ reaction/process.

• exothermic, endothermic

• endothermic, exothermic

• There is no way to know this answer.

Answer explanation

A -Q indicates a release of heat, making it an exothermic reaction, while a +Q indicates heat absorption, classifying it as an endothermic reaction. Therefore, the correct answer is exothermic for -Q and endothermic for +Q.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

NGSS.MS-PS3-4

If ΔT is positive then heat is being ___________by the reaction, and if  ΔT is negative then heat is being _____________by the reaction.

• absorbed, released

• released, absorbed

• heat is staying the same

• There is no way to know what is going on with the heat.

Answer explanation

If ΔT is positive, it indicates that the temperature is increasing, meaning heat is being released by the reaction. Conversely, if ΔT is negative, the temperature is decreasing, indicating heat is being absorbed by the reaction.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

The specific heat of aluminum is 0.897 J/g°C.  What is the value of heat( Q) for the aluminum when a 10 g piece of aluminum foil is taken out of the oven and cools from 100° to 50°?

• -448.5 J

• -60.897 J

• +557.413 J

• +448.5 J

Answer explanation

To find Q, use Q = mcΔT. Here, m = 10 g, c = 0.897 J/g°C, and ΔT = 50°C - 100°C = -50°C. Thus, Q = 10 g * 0.897 J/g°C * -50°C = -448.5 J. The correct answer is -448.5 J.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

The specific heat of water is 4.18 J/g°C.  20 grams of water goes from a temperature of 25° C to 20° C. What is the value of Q?

• -418 J

• +209 J

• -83 J

• +4.18 J

• +418 J

Answer explanation

To find Q, use the formula Q = mcΔT. Here, m = 20 g, c = 4.18 J/g°C, and ΔT = (20 - 25)°C = -5°C. Thus, Q = 20 * 4.18 * -5 = -418 J. The correct answer is -418 J.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4