Chemical Reactions

Front

Which best describes a chemical reaction?

Back

the rearrangement of atoms by breaking and reforming chemical bonds

Tags

NGSS.MS-PS1-5

Front

Which is an example of a chemical reaction?

• paper folded into tiny pieces
• paper burned and turned into smoke
• paper soaked in water
• paper shredded and turned into pulp

Back

paper burned and turned into smoke

Tags

NGSS.MS-PS1-2

Front

Did Pedro succeed in creating a chemical change when he added oil to water and shook the beaker?

Back

No, because no new substances were formed.

Tags

NGSS.MS-PS1-2

Front

What process has the copper of the Statue of Liberty undergone over the years?

Back

a chemical reaction

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

Which of these most likely represents a chemical change?

• water boiling
• sugars digested by saliva
• mud drying to dirt
• ice cream melting

Back

sugars digested by saliva

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

The expression CaCO₃ → CaO + CO₂ is an example of a

Back

chemical equation.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is the number “4” in SiCl₄?

Back

a subscript

Tags

NGSS.MS-PS1-1

Front

Which symbol in a chemical equation separates the reactants from the products?

Back

→

Front

30 grams of lead oxide and 15 grams of ammonia react completely to produce solid lead, nitrogen gas, and liquid water. What will be approximate mass of all three products?

Back

45 g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

Which best represents the law of conservation of mass?

• mass of reactants > mass of products
• mass of reactants < mass of products
• mass of reactants = mass of products
• mass of reactants → mass of products

Back

mass of reactants = mass of products

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5