.[BW] APR 11-12 HON SEM 2 REVIEW__3 ENERGY

The average kinetic energy of the particles in a sample of matter is measured as the ___?___

• kinetic force

• thermal rate

• reaction rate

• temperature

What type of energy is stored in chemical bonds?

• Chemical potential energy

• Chemical kinetic energy

• Thermal potential energy

• Thermal kinetic energy

Calculate the heat transferred (q) when 440 g of water cools from 87.2°C to 50.0°C. (C = 4.18 J/g°C)

• 68000 J

• -2.8 J

• -3900 J

• 2.8 J

• -68000 J

If 238 J of heat is absorbed by a sample of metal with a mass of 40.7 g, and it raises the temperature from 20.0°C to 32.4°C, what is the specific heat capacity of the metal?

• 2.34 J/g°C

• 6.13 J/g°C

• 0.472 J/g°C

• 0.163 J/g°C

A sample of iron receives 50.0 J of heat energy that raises the temperature of the iron 25.0°C. If iron has a specific heat of .10 J/g°C, what is the mass of the iron sample?

• 0.200 g

• 20.0 g

• 30.0 g

• 50.0 g

If a reaction is endothermic, which statement below best describes the energy of the products and reactants in the reaction?

• Energy is given off during the reaction, making the energy of the products greater than the energy of the reactants.

• Energy is absorbed during the reaction, making the energy of the reactants greater than the energy of the products.

• Energy is given off during the reaction, making the energy of the reactants greater than the energy of the products.

• Energy is absorbed during the reaction, making the energy of the products greater than the energy of the reactants.

∆H is positive

• endothermic

• exothermic

The products contain more energy than the reactants

• endothermic

• exothermic

Exothermic reactions are reactions that

• release heat

• absorb heat

• do not involve heat

• take place instantaneously

If the enthalpy change (ΔH) is negative the reaction is ____.

• Endothermic

• Exothermic

• Neutral