Chemical Reactions

Complete the sentence.

During a chemical reaction, atoms _______________.

• appear

• disappear

• rearrange

• completely stop moving

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In a ___________change, a substance changes into a different substance.

• Physical
• Chemical

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The Law of Conservation of Mass states

• that matter exists in all states and reacts the same
• that matter can only be changed into new substances by introducing a catalyst
• that matter exists in the same state throughout any chemical change
• that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants

Tags

NGSS.MS-PS1-5

A copper penny turning greenish after a few years.

• Chemical Change

• Physical Change

Tags

NGSS.MS-PS1-2

What is the role of the arrow sign in a chemical reaction?

• to show which substances are solids and which are liquids

• to separate the products and the reactatnts

• to separate the atoms from the molecules

In a chemical reaction, the mass of the reactants is 500g. What must be true of the mass of the products?

• the mass of the products will be less

• the mass of the products will be more

• the mass of the products must be 500g

• there is no way of knowing what the mass of the products will be

Tags

NGSS.MS-PS1-5

Which of the following describes the properties of this rock?

• black and speckled

• made of Fe (iron)

• made of Pb (lead)

Which of the following is true of this diagram?

• There are 2 molecules of water

• There are two atoms of oxygen

• There are 4 atoms of hydrogen

• All of the above are true

Tags

NGSS.MS-PS1-1

Which part of this equation are the reactants?

• everything on the left side of the arrow

• everything on the right side of the arrow

• only the nitrogen

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-1

True or False
In a chemical reaction, no new atoms are created, and no atoms are destroyed. 

• true
• false

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5