Chemical Reactions

Which of the following are signs of a chemical reaction?

• Formation of a gas

• A change in temperature

• A change in color

• A change in size

Tags

NGSS.MS-PS1-2

In a chemical reaction, the number of atoms in the reactants and the products...

• Must be the same

• Must be different

Tags

NGSS.MS-PS1-5

Which of these is NOT a sign of a chemical reaction?

• A phase change

• Formation of a precipitate

• A color change

• A temperature change

Tags

NGSS.MS-PS1-2

When a chemical reaction occurs...

• New molecules and atoms are formed

• Molecules and atoms are rearranged

• Molecules and atoms disappear

• Molecules and atoms are destroyed

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What type of reaction involves the breaking down of a substance into simpler substances?

• Single Displacement Reaction

• Double Displacement Reaction

• Synthesis Reaction

• Decomposition Reaction

Tags

NGSS.MS-PS1-2

A copper penny turning greenish after a few years is an example of ...

• Chemical Change

• Physical Change

Tags

NGSS.MS-PS1-2

Is the chemical equation here balanced?

• Yes

• No

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

You have 2 chemicals, CHEMICAL A and CHEMICAL B. They are both liquids. When you combine them you notice some crystals starting to form within them. Did a chemical reaction occur?

• Yes

• No

Tags

NGSS.MS-PS1-2

This is the decomposition reaction of hydrogen peroxide. According to the law of conservation of mass, if you start with 40g of hydrogen peroxide you should end up with _____g of water and oxygen combined.

• 10

• 20

• 30

• 40

Tags

NGSS.MS-PS1-5

When you combine baking soda and vinegar the reaction produces bubbles. Explain how you know that this is a chemical reaction.

Tags

NGSS.MS-PS1-2