Thermochemistry Practice

The potential energy diagram of a reaction is shown. Which statement below is correct relating to this reaction?

• #1 represents the enthalpy change for this exothermic reaction.

• #2 represents the enthalpy change for this endothermic reaction.

• #3 represents the enthalpy change for this endothermic reaction.

• #4 represents the enthalpy change for this exothermic reaction.

Tags

NGSS.HS-PS1-4

During an exothermic reaction, heat content in the surroundings increases because

• heat energy is destroyed during reactions

• the reaction absorbs heat energy

• the energy contained in the reactants is lower then the products

• the energy contained in the products is lower than the reactants

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

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.

Tags

NGSS.HS-PS3-4

A 12 g of gold increases from 45°C to 15°C is -47 J, What is the specific heat capacity of gold? What variable are you solving for?

• Cp

• m

• ΔT

• q

Tags

NGSS.HS-PS3-4

A cast iron skillet is used to fry bacon. For optimal frying, the pan must be heated to about 178 ^oC from a room temperature of 22.0 ^oC. It is known that 1.58 x 10⁵ J of heat energy are absorbed by the pan to reach the desired temperature and the specific heat of iron is 0.450 J/g ^oC. What mass of bacon was fried? What units should your answer be in?

• m

• kg

• C

• J

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

The amount of heat required to raise the temperature of one gram of a substance by one degree Celsius is ________

• Heat energy
• Specific heat
• convection
• thermal energy

How many Joules of energy are required to change 10 gram of water from 20 C to 90 C? What variable are you solving for?

• Cp

• q

• m

• T

Tags

NGSS.HS-PS3-1

Heat energy moves from __________ things to _________ things.

• warm / cold
• cold / warm
• liquid / solid

Tags

NGSS.HS-PS3-4

What type of reaction is pictured behind?

• endothermic
• exothermic

Tags

NGSS.HS-PS1-4

When ammonium nitrate dissolves in water, the solution gets cold. Which is true?

• Reaction is ENDOTHERMIC with positive ΔH
• Reaction is ENDOTHERMIC with -ΔH
• Reaction is EXOTHERMIC with a -ΔH
• Reaction is EXOTHERMIC with +ΔH

Tags

NGSS.HS-PS1-4