Thermochemistry

5.0 g of copper was heated from 20°C to 80°C. How much energy was used to heat Cu? (Specific heat capacity of Cu is 0.092 J/g °C)

• 27.6 J

• 36.8J

• 9.2 J

• 0.91 J

Tags

NGSS.HS-PS3-4

Calculate the specific heat capacity of titanium if a 43.56 g sample absorbs 0.476 kJ as its temperature changes from 20.13 C to 41.06 C

• 0.001 J/g°C

• 434.0 J/g°C

• 0.522 J/g°C

• 0.266 J/g°C

A student must use 225 g of hot water in a lab procedure. If the specific heat of water is 4.184 J/g°C Calculate the amount of heat required to raise the temperature of water from 20.0 C to 100.0 C.

• 94140 J

• 75312 J

• 18828 J

• 0.672 J

Maria finds that it takes exactly 3,748 Joules to raise the temperature of her coffee from 18°C to 80°C. If the mass of her coffee is 89 g, what is the specific heat of the coffee?

• 0.526 J/g°C

• 42.11 J/g°C

• 60.45 J/g°C

• 0.679 J/g°C

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

The specific heat of a substance (C), whose units are J/g°C, is defined as

• The number of Joules required to raise the temperature of 1 gram of the substance 1 °C.

• The change in temperature when you add 1 Joule of energy.

• The number of grams created when the substance cools down 1°C.

• How hot or cold that specific amount of substance is.

Is the following change of state an endothermic process or an exothermic process? H2O(l) + E --> H2O(g)

• Exothermic

• Endothermic

• Neither endothermic or exothermic

• Both endothermic and exothermic

When Julio dissolved Sodium Hydroxide in water, he noticed that the temperature of the water increased drastically. He could conclude that this dissolving process, shown below, was… NaOH(s) --> Na+ (aq) + OH-(aq)

• Exothermic

• Endothermic

• Neither endothermic or exothermic

• Both endothermic and exothermic

Tags

NGSS.HS-PS1-4

Iron has a specific heat of 0.449 J/g°C. How much heat is transferred to a 8.00 g piece of iron when it is heated from 15.0 °C to 45.0 °C?

• 13.5 J

• 53.9 J

• 107.8 J

• 161.6 J

A 100 g block of metal absorbs 900 Joules of thermal energy when its temperature changes from 20oC to 40oC. Calculate the specific heat of the metal.

• 1800000 J/g°C

• 0.23 J/g°C

• 9.00 J/g°C

• 0.45 J/g°C

A 21.0 g piece of an unidentified metal was heated from 19.2 oC to 66.2 oC. If 641.6J of heat energy was absorbed by the metal in the process, what is the identity of the metal? Specific Heat Table is on the board

• Copper

• Silver

• Iron

• Calcium