The Nature of Energy

The Nature of Energy

Standard H.C.7: The student will demonstrate an understanding of the conservation of energy and energy transfer

EQ. How can reactions be categorized based on their movement of energy?

Multiple Choice

Does energy disappear?

• True

• False

Multiple Choice

Energy is defined as

• the rate at which work is performed
  
• the rate of nuclear fusion
  
• the capacity to do work
  
• coal, oil, and petroleum

Multiple Choice

In order to use the energy inside of fossil fuels, they must be...

• burned

• melted

• crushed

• cut

Open Ended

How was your weekend plans, How ya doin' (1-10), and Would you rather be on a survival reality show or dating game show?

Multiple Choice

A reaction produces 3.8 cal of energy. How many joules

of energy is produced?

• 16 J

• 3.8 J

• 1.1 J

• 0.91 J

Multiple Choice

A reaction uses 235 J of energy. How many calories

have been burned?

• 983 cal

• 983 Cal

• 56.2 cal

• 56.2 Cal

Multiple Choice

A 20 ounce coke contains 240 Calories. How many

kilojoules of energy are present in a 20 ounce Coke?

• 1.0 x 10³ kJ

• 1.0 kJ

• 57 kJ

• 0.057 kJ

Multiple Choice

Ten grams of table salt are dissolved in water in a 250 mL

beaker. Which of the following is/are component(s) of the

system?

• NaCl

• water

• Na+ and Cl-

• All of the above

Multiple Choice

When a strong acid is added to a flask containing water

the flask becomes warm to the touch. This is because...

• the reaction performed work on the flask

• the system absorbed heat from the surroundings

• the system released heat to the surroundings

• the surroundings released heat to the system

Multiple Choice

When a strong acid is added to a flask containing water

the flask becomes warm to the touch. Which correctly

describes the change in energy relative to both the

system and surroundings?

• ΔE_sys is positive and ΔE_sur is negative

• ΔE_sys is positive and ΔE_sur is positive

• ΔE_sys is negative and ΔE_sur is positive

• ΔE_sys is negative and ΔE_sur is negative

Multiple Choice

The ΔE of a system that gains 50 kJ of heat and

performs 24 kJ of work on the surroundings is

________ kJ.

• -74

• +26

• -26

• +74

Multiple Choice

The ΔE of a system that releases 120 J of heat

and does 40 J of work on the surroundings is

________ J.

• -160

• -80

• +80

• +160

Multiple Choice

The ΔE of a system that absorbs 120 J of heat and

does 120 J of work on the surroundings is

________ J.

• -240

• -120

• 0

• +120

Multiple Choice

The ΔE of a system that absorbs 12,000 J of heat,

and that has 12,000 J of work done on it by the

surroundings is _______ J.

• -24,000

• -12,000

• 0

• +24,000

Multiple Choice

The reaction that occurs inside a foot warmer packet is

endothermic?

• True

• False

Multiple Choice

What will happen when a hot rock is put into

cold water?

• the water and rock will both

  gain energy

• the water and rock will both lose

  energy

• the rock will gain energy and the water will

  lose energy

• the rock will lose energy and the water will

  gain energy

Multiple Choice

If you put a hot rock in cold water, and your

system is the rock, the process is _______.

• exothermic

• endothermic

• neither, there is no net change of energy

• it depends on the exact temperatures

Multiple Choice

If you put a hot rock in cold water, and your

system is the water, the process is _______.

• exothermic

• endothermic

• neither, there is no net change of energy

• it depends on the exact temperatures

Multiple Choice

If you put an ice cube in water, and your system

is the ice, the process is _______.

• exothermic

• endothermic

• neither, there is no net change of energy

• it depends on the exact

  temperatures

Multiple Choice

If you put an ice cube in water, and your system

is the ice, the process is _______.

• exothermic

• endothermic

• neither, there is no net change of energy

Multiple Choice

If you put an ice cube in water, and your system

is the water, the process is _______.

• exothermic

• endothermic

• neither, there is no net change of energy

Multiple Choice

When NaOH dissolves in water, the temperature of the

solution increases. This reaction is________.

• endothermic

• exothermic

• neither

Multiple Choice

When CaCl ₂ dissolves in water the temperature of the

solution drops. This reaction is _____.

• exothermic

• endothermic