chemical reactions

Which of these is NOT a sign that a chemical change has occurred? 

• A loss of transparency 
• An unexpected color change
• A temperature change
• The formation of a precipitate

Tags

NGSS.MS-PS1-2

a copper penny turning greenish after a few years.

• Chemical Change
• Physical Change

Tags

NGSS.MS-PS1-2

True or false? Chemical reactions are easily reversible

• True

• False

Tags

NGSS.HS-PS1-6

In a word equation, the starting chemicals are called...

• reactants

• products

• ingredients

Tags

NGSS.MS-PS1-5

In this chemical reaction, which is the product/s?

Magnesium + Oxygen --> Magnesium oxide

• magnesium

• magnesium and oxygen

• magnesium oxide

• oxygen

Tags

NGSS.HS-PS1-2

What is the scientific term given when something burns?

• a fuel

• flammable

• combustion

• heating

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Sometimes, compounds can be broken down into simpler substances. What type of reaction is this?

• combustion

• oxidation

• decomposition

• displacement

Tags

NGSS.MS-PS1-2

When energy is transferred from the substances to the surroundings during a chemical reaction, what type of reaction is this?

• endothermic

• exothermic

• decomposition

• combustion

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

In an endothermic reaction is energy transferred to the surroundings or to the substances?

• surroundings

• substances

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Which is NOT an example of something you could observe that would suggest a chemical reaction is taking place?

• melting

• fizzing

• smells

• temperature change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5