Balancing Chemical Equations and Law of Conservation of Mass

Which is Chemical Equation is Balanced?

• CH₄+O₂------CO₂+2H₂O
• H₂+O₂-----2H₂O₄
• 4Al+3O₂-----2Al₂O₃

Tags

NGSS.MS-PS1-5

_________ are the substances that are produced in a chemical reaction.

• Reactants

• Producer

• Reaction

• Product

________ are the starting substances in a chemical equation.

• Reactants

• Producer

• Reaction

• Products

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The law of conservation of mass states that ________

• the total mass of reactants is more than the total mass of products

• the mass of a chemical reaction is not constant

• the mass of a chemical reaction remains constant

• the total mass of reactants is less than the total mass of products

Tags

NGSS.MS-PS1-5

According to the law of conservation of mass, how much mercury was present in the mercury (II) oxide?

• 55.8 g

• 64.2 g

• 60.0 g

• 126.0 g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which chemical equation supports the law of conservation of mass?

• Equation (a)

• Equation (b)

• Equation (c)

• Equation (d)

Tags

NGSS.MS-PS1-5

Solve for the unknown mass: 6.1 g + ? g = 9.1 g

• 15.2

• 3 g

• 15.2 g

• 3

According to the law of conservation of mass, how much zinc was present in the zinc carbonate?

• 256 g

• 88 g

• 104 g

• 40 g

Tags

NGSS.MS-PS1-5

How many oxygen atoms are present in the following? 
4Ca(OH)₂

• 4
• 6
• 8
• 1

Tags

NGSS.MS-PS1-1

The substances listed on the right side of a chemical equation are the

• Yields
• Reactants
• Products
• Precipitates