Thermochem & Gases Review

What mass of aluminum (c= 0.89 J/g·°C) is needed if the temperature changes from 17°C to 45 °C when 450 J of heat is absorbed by the metal? Is this process endothermic or exothermic?

• 50 g, endothermic

• 100 g, endothermic

• 150 g, endothermic

• 200 g, exothermic

Tags

NGSS.HS-PS1-4

How much heat is released when 56 g of copper (c= 0.39 J/g·°C) is cooled from 100°C to 15 °C? Is this process endothermic or exothermic?

• -1516.8 J, exothermic

• 1516.8 J, endothermic

• -1516.8 J, endothermic

• 1516.8 J, exothermic

Tags

NGSS.HS-PS3-4

NGSS.HS-PS3-1

What is the change in temperature when 15 g sample of water (c=4.18 J/g°C) absorbs 875 J of heat? Is this process endothermic or exothermic?

• 14.0 °C, endothermic

• 14.0 °C, exothermic

• 58.7 °C, endothermic

• 58.7 °C, exothermic

Tags

NGSS.HS-PS3-4

NGSS.HS-PS3-1

Aluminum metal (c= 0.89 J/g·°C) at 100.0 °C is added to 250.0 g of water (c=4.18 J/g·°C) at 17 °C. If the final temperature of the system is 23°C, what was the mass of Aluminum?

• 50 g

• 100 g

• 150 g

• 200 g

Tags

NGSS.HS-PS3-4

NGSS.HS-PS3-1

A 55.0 g sample of an unknown metal at 85°C is added to a 220 g sample of water (c=4.18 J/g·°C) at 22 °C. If the final temperature of the system is 26 °C, what is the specific heat value of the metal?

• 0.385 J/g·°C

• 0.450 J/g·°C

• 0.215 J/g·°C

• 0.328 J/g·°C

Tags

NGSS.HS-PS3-4

NGSS.HS-PS3-1

On which line would you use the following formulas? q = m∙ΔH_fusion and q = m∙ΔH_vaporization

• When calculating the heat absorbed or released during melting or freezing and evaporating or condensing

• When determining the speed of an object in motion

• When calculating the gravitational force between two objects

• When measuring the electrical resistance in a circuit

Given the following information, calculate how much energy is needed to raise the temperature of 10g of ice at -15°C to steam at 120°C.

• 15,403.75

• 30,807.5

• 45,210.25

• 60,614

Tags

NGSS.HS-PS3-4

NGSS.HS-PS3-1

When calculating heat using a cooling curve, the q value should always be _______.

• positive

• negative

• zero

• variable

What will happen to the volume of a balloon if it is heated?

• It will decrease

• It will increase

• It will stay the same

• there will be no change

What will happen to the pressure of a gas when the volume is decreased?

• The pressure will increase

• The pressure will decrease

• The pressure will remain the same

• The pressure will initially decrease then increase