Chemical Reactions

Which statement explains the Law of Conservation of Matter?

• In a chemical reaction, matter can only be destroyed.
• In a chemical reaction, matter can only be created.
• Matter can neither be created nor destroyed in a chemical reaction.
• Matter can be created or destroyed in a chemical reaction.

Tags

NGSS.MS-PS1-5

A + B > AB

What type of chemical reaction is this?

• single
• double
• synthesis
• decomposition

The substances to the left of the arrow in a chemical equation are called –

• subscripts
• coefficients
• reactants
• products

The substances to the right of the arrow in a chemical equation are called-

• coefficient
• reactant
• subscript
• product

How many atoms of hydrogen (H), sulfur (S), and oxygen (O) are there in sulfuric acid (H₂SO₄)?

• H-6, S-4, O-4
• H-1, S-2, O-8
• H-2, S-1, O-4
• H-2, S-4, O-4

Tags

NGSS.MS-PS1-1

2Ca + O₂ > 2CaO 

What is the 2 located in front of calcium (Ca) called? 

• coefficient
• subscript
• reactant
• product

2Ca + O₂ > 2CaO 

What is the 2 located behind oxygen (O) called?

• coefficient
• reactant
• subscript
• product

What happens to some of the mass when bubbles are formed during a chemical reaction?

• stays the same
• escapes as a gas
• absorbed into each other
• nothing

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What type of chemical reaction releases energy in the form of heat?

• endothermic
• exothermic
• subthermic
• geothermic

What type of chemical reaction is the equation below. 

2Fe + 6NaBr > 2FeBr₃ + 6Na

• single

• double
• synthesis
• decomposition