Thermochemistry

Chemical energy is a type of kinetic energy.

• True
• False

How many calories are in 5.67 kJ?

• 23,723
• 1.36
• 1355
• 23.7

Choose the FALSE statement.

• The total energy in the universe is always changing.
• The surroundings are defined as anything that isn't part of the system.
• If a system changes energy, the surroundings change energy too.
• Energy can convert between kinetic and potential forms.

Tags

NGSS.HS-PS3-1

If a reaction releases 45 kJ of energy, how much energy do the surroundings gain?

• -45 kJ
• +45 kJ
• -90 kJ
• +90 kJ

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

If a reaction feels cold to the touch, it is:

• Endothermic
• Exothermic

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

q is the symbol for work.

• True
• False

An exothermic process has:

• -q
• +q
• -w
• +w

Tags

NGSS.HS-PS1-4

A process that does work on the surroundings has a negative sign for w.

• True
• False

A reaction in a container with a piston feels warm to the touch and pushes the piston up significantly. Which is true?

• q is positive, w is positive
• q is negative, w is positive
• q is positive, w is negative
• q is negative, w is negative

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

A reaction in a balloon feels warm to the touch and the balloon shrinks significantly. Which is true?

• q is positive, w is positive
• q is negative, w is positive
• q is positive, w is negative
• q is negative, w is negative

Tags

NGSS.HS-PS1-4