Optional: Heat Review

______________ describes how much ENERGY is required to change a 1 kg object's temperature by 1 degree C

• specific heat

• thermal energy

• Joules

• kinetic energy

The diagram represents two solids and the temperature of each. What occurs when the two solids are placed in contact with each other?

• Heat energy flows from solid A to solid B. Solid A decreases in temperature

• Heat energy flows from solid A to solid B. Solid A increases in temperature

• Heat energy flows from solid B to solid A. Solid B decreases in temperature.

• Heat energy flows from solid B to solid A. Solid B increases in temperature.

The amount of heat energy required to change the temperature of 12 g of gold from 45°C to 15°C is -47 J. What is the specific heat capacity of gold?

• 0.13 J/(g°C)

• 17,000 J/(g°C)

• 1600 J/(g°C)

• 0.065 J/(g°C)

In an endothermic reaction the system is releasing energy.

• True
• False

What is the symbol for heat?

• q
• H
• J
• ∘C

What are chemical reactions that absorb energy?

• endothermic

• fast

• slow

• exothermic

What is the formula for calculating heat?

• q = mcΔT

• H = ΔH x moles

• H = ΔH x grams

• products - reactants

Consider the reaction: 2 H₂O + energy --> 2H₂ + O₂

• exothermic because releasing energy

• exothermic because absorbing energy

• endothermic because absorbing energy

• endothermic because releasing energy

Heat flows from _______ to ______ objects

• cooler to warmer
• warmer to warmer
• warmer to cooler
• cooler to cooler

A 500g piece of aluminum has a temperature of 7°C. What is the heat energy produced? Specific heat of Aluminum is 0.900 J/gºC.

• 3000 J

• 3000 g

• 3150 J

• 3150 g