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

Which of the following IS a physical change?

• Getting a haircut
• Rusty metal
• sour milk
• A compound

How many atoms of carbon (C) are in C₆H₁₂O₆?

• 3
• 6
• 12
• 24

Tags

NGSS.MS-PS1-1

A group of atoms bonded together. 

• A Molecule
• The Coefficient
• The Subscript
• An Atom Party

How many oxygen atoms are in this chemical formula?

• 7 oxygen atoms
• 4 oxygen atoms
• 3 oxygen atoms
• 1 oxygen atoms

Which of the following is an example of a chemical change?

• cutting your hair
• burning wood
• boiling water

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Select the pair of words that correctly displays the general FORMAT for writing CHEMICAL EQUATIONS.

• products  -->  reactants
• products  -->  products
• reactants  -->  products
• reactants  -->  reactants

Tags

NGSS.MS-PS1-5

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

• Physical
• Chemical

How many Al atoms are in 4 Aluminum Oxide molecules?

4 Al₂O₃

• 2

• 8

• 6

• 4

A copper penny turning greenish after a few years.

• Chemical Change
• Physical Change