Chemical Reactions and Energy

The energy required to start a chemical reaction is ___.

• endothermic

• exothermic

• activation

• released

Tags

NGSS.HS-PS1-5

An _______ reaction is when more thermal energy is released than is absorbed.

• endothermic

• endergonic

• exothermic

• exergonic

Tags

NGSS.HS-PS1-4

Fireworks are an _____ reaction.

• EXOthermic

• ENDOthermic

Tags

NGSS.HS-PS1-4

A chemist is doing an ENDOthermic reaction. The starting temperature was 25 degrees Celsius. Which of the following would be a reasonable ending temperature

• 44 degrees

• 30 degrees

• 15 degrees

• 25 degrees

Tags

NGSS.HS-PS1-4

Some chemical reactions release energy, others store energy.

• True

• False

Tags

NGSS.HS-PS1-4

What is required to break bonds in reactants and form new bonds in products?

• Water

• Energy

• A physical change

• Oxygen

Tags

NGSS.HS-PS1-4

The oxygen you breathe breaks down sugar to release the energy stored in the molecule, creating carbon dioxide and water in the process. This is an example of a...

• Physical Change

• Chemical Change

Tags

NGSS.HS-LS1-7

NGSS.HS-LS2-5

A burning candle is the process of transforming--

• heat energy into chemical energy

• chemical energy into light and heat

• chemical energy into mechanical energy

• chemical energy into nuclear energy

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

Which statement best describes evidence that a chemical reaction occurs as a cake bakes?

• The water in the cake batter evaporates.

• The cake rises as gas bubbles form in the baking cake.

• The cake takes the shape of the container in which it is baked.

• The water in the cake batter is used to keep the cake moist as it bakes.

Tags

NGSS.MS-PS1-2

In order for rockets to travel into space, they need to bring their own supply of ___________ for the combustion of the rocket fuel.

• oxygen

• magnesium

• chlorine

• iron