Chemical Reactions

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

How many Al atoms are in this compound?         4Al₂O₃

• 2
• 8
• 6
• 4

Tags

NGSS.MS-PS1-1

___________________ are the elements are compounds that leave (are formed in) a chemical
reaction.

• Polymers
• Bonds
• Reactants
• Products

Tags

NGSS.MS-PS1-5

The red numbers in the image below represent ________

• subscripts
• coefficients
• I don't know, and don't want to try
• None of the answers are correct

Tags

NGSS.HS-PS1-7

 Mg  +  ___ HCl  →   MgCl₂  +   H₂

• 1
• 2
• 3
• 4

In the equation,          2Mg + O₂ ---> 2MgO, which are the reactants?

• Mg and O
• MgO
• Mg and MgO
• O and MgO

Tags

NGSS.MS-PS1-2

A molecule made of 2 atoms is called a ____________________.

• Diatomic Molecule
• Chemical Bond
• Product
• Reactant

Tags

NGSS.MS-PS1-1

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

What type of reaction involves 2 substances combining to form 1 new compound?

• Decomposition Reaction
• Single Displacement Reaction
• Double Displacement Reaction
• Synthesis Reaction

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What type of reaction involves one element replacing another element in a compound?

• Single Displacement Reaction
• Double Displacement Reaction
• Synthesis Reaction
• Decomposition Reaction

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5