Law of Conservation of Mass

Which of the following does not accurately describe the Law of Conservation of Mass?

• Matter cannot be created or destroyed.

• The mass of the reactants must equal the mass of the products.

• The atoms of each element must be equal on both sides of a chemical equation.

• The reactants always have more mass than the products.

Tags

NGSS.MS-PS1-5

A chemical equation contains 4 atoms of oxygen on the reactants side. How many atoms of oxygen must be present on the products side?

• 2 atoms

• 4 atoms

• 8 atoms

• 10 atoms

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NGSS.MS-PS1-5

Which of the following chemical reactions correctly represents the Law of Conservation of Mass?

• 2H₂ + 2O₂ → 2H₂O

• 4K + 2O₂ → 2K₂O

• 4Mg + 2O₂ → 4MgO

• HCl + 2NaOH → 2NaCl + H₂O

Tags

NGSS.MS-PS1-5

Which of the following is an example of the Law of Conservation of Mass in action?

• Mixing baking soda and vinegar to produce gas, water, and a salt

• Spraying air freshener to make the room smell better

• Taking a bite of a piece of pizza

• Fertilizing a garden

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NGSS.MS-PS1-5

NGSS.MS-PS1-2

A chemical equation contains a different amount of atoms of specific elements on the reactants and products sides. This chemical equation would be considered to be which of the following?

• balanced

• unbalanced

• equal

• conserved

Tags

NGSS.MS-PS1-5

Students mix 25 grams of baking soda with 15 grams of vinegar to observe the chemical reaction that takes place. How many grams of products would be expected?

• 15 grams

• 25 grams

• 40 grams

• 50 grams

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

According to the Law of Conservation of Mass, during a chemical reaction atoms are -

• created

• destroyed

• unchanged

• rearranged into new substances

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NGSS.MS-PS1-5

Which of the following correctly describes the chemical reaction?

• Atoms are rearranged into carbon dioxide and water

• Atoms are rearranged into glucose and oxygen

• Atoms are rearranged into the same exact substances

• Atoms are not rearranged, but new substances are created

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

According to the Law of Conservation of Mass, if 30 grams of CO₂ and 55 grams of H₂O produce 70 grams of C₆H₁₂O₆, how many grams of O₂ would be produced?

• 15 grams

• 35 grams

• 70 grams

• 85 grams

Tags

NGSS.MS-PS1-5

NGSS.MS-LS1-6

Which of the following is not a true statement?

• Carbon dioxide and water are the reactants

• Glucose and oxygen are the products

• There are the same number of atoms of each element present

• There are different atoms of each element present

Tags

NGSS.MS-PS1-5

NGSS.MS-LS1-6