Unit 3 Section C (Energy and Heat of Chemical Reactions)

The SI unit of heat and energy is the __________.

• calorie

• heat

• joule

• watt

Temperature is a measure of average [blank] energy of individual atoms.

• heat
• potential
• mechanical
• kinetic

Tags

NGSS.HS-PS3-2

ΔH (change in energy) value in an endothermic reaction is a positive number.

• True

• False

 _?_  is the amount of energy required to raise the temperature of 1 gram of any substance 1^oC.

• Specific heat
• A calorie
• Thermal energy
• Conduction

As 120 g of hot milk cools in a mug, it transfers 20, 000 J of heat to the environment. What is the temperature change of the milk? The specific heat of milk is 2.6 J/g·°C.

• 64 °C

• 1.56 °C

• 640 °C

• cannot be determined

Based on the data collected, what is the heat of combustion of ethane in kJ/g.

• 53

• 36

• 18

• 86

How much heat does an aluminum block absorb if 10.00 grams ae heated from 25.0^oC to 50.0^oC? the specific heat of aluminum is 0.900J/g^oC

• 450
• -450
• 225
• -225

Tags

NGSS.HS-PS3-4

NGSS.HS-PS3-1

The diagram represents which type of reaction

• endothermic
• exothermic

Tags

NGSS.HS-PS1-4

How do you calculate the energy change of a reaction?

• ΔH = ΔH_reactants - ΔH_products

• ΔT = q / mC

• E = mc²

• q= mCΔT

Describe the energy change that takes place when bonds are broken.

• Energy is released

• Energy is needed

• Energy is either needed or released

• Energy is never part of the reaction.