8.P.1.4

A chemical reaction occurs in a sealed test tube. As the results of the reaction 24 grams of product are produced. Which is most likely true?

• The mass of the reactants was 24 grams

• The mass of the reactants was less than 24 grams

• The mass of the reactants was more than 24 grams

Tags

NGSS.MS-PS1-5

Which is a balanced chemical equation according to the law of conservation of mass?

• CH₄ + O₂ ---> CO₂ + 2H₂O

• CH₄ +2O_{2 ---->} CO₂ + 2H₂O

• 2CH₄ + O₂ ----> CO₂ + 2H₂O

Tags

NGSS.MS-PS1-5

Which is true of any physical or chemical reaction?

• Mass increases

• Mass fluctuate

• Mass is conserved

Tags

NGSS.MS-PS1-5

If a chemical reaction starts with 10 times the amount of oxygen and hydrogen atoms shown which best describes the amount of product? 2H₂+O₂ ----> 2H₂O

• There would be 10 times more water molecules produced

• There would be 20 times more water molecules produced

• There would be the same amount of water molecules produces

Tags

NGSS.MS-PS1-5

Which chemical equation correctly demonstrates the conservation of mass?

• KClO₃ ---> KCl + O₂

• H₂O +CO₂ -----> H₂CO₃

• Mg + HCl ----> H₂ = MgCl₂

Tags

NGSS.MS-PS1-5

When vinegar and baking soda are combined, a mixture is produced, and gas is released. Which statement is true?

• The mass of the gas is equal to the mass of the vinegar and baking soda

• The mass of the mixture and gas is equal to the mass of the vinegar and baking soda

• The mass of the mixture and gas is greater than the mass of the baking soda and vinegar

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which ratio of reactants to products supports the law of conservation of mass?

• 1:1 because the mass of the reactants before the reaction is equal to the mass of the products after the reaction

• 1:2 because the mass of the reactants is doubled during the reaction

• 2:1 because the mass of the reaction is halved (cut in half) during the reaction

Tags

NGSS.MS-PS1-5

In the equation below, supposed 11 grams of zinc react with 12 grams of hydrogen chloride to form 16 grams of zinc chloride and an unknown amount of hydrogen gas.

Zn + 2HCl ----> ZnCl₂ + H₂

Base on the law of conservation of mass, how many grams of hydrogen gas will form?

• 1 gram

• 7 grams

• 10 grams

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

3P + 5O₂ ----> P₄10

• Balanced Equation

• Unbalanced Equation

Tags

NGSS.MS-PS1-5