Module 4 Lessons

Which statement is true about the total mass of the reactants during a chemical change? 4.01

• It is destroyed during chemical reaction.

• It is less than the total mass of the products.

• It is equal to the total mass of the products.

• It is greater than the total mass of the products.

Tags

NGSS.HS-PS1-7

Based on the law of conservation of mass, which of the following statements is correct? 4.01

• Matter is neither created nor destroyed.

• Matter can be created but it cannot be destroyed.

• The total mass of substances before a reaction is less than the total mass after a reaction.

• The total mass of substances before a reaction is greater than the total mass after a reaction.

Tags

NGSS.HS-PS1-7

Which of the following happens during a chemical reaction? 4.01

• Atoms of reactants are destroyed.

• New atoms are created to form the products.

• Atoms of reactants rearrange to form new substances.

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

Tags

NGSS.HS-PS1-7

Look at the chemical equation:

Zn + 2HCl → ZnCl₂ + H₂

How many atoms of hydrogen (H) are present on both sides of the equation? 4.01

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Look at the chemical equation:

3H₂ + N₂ → 2NH₃

How many atoms of hydrogen (H) are present on both sides of the equation? 4.01

• 2

• 3

• 5

• 6

Tags

NGSS.HS-PS1-7

Look at the chemical equation:

2H₂S + 3O₂ → 2H₂O + 2SO₂

How many atoms of hydrogen (H) are present on both sides of the equation? 4.01

• 2

• 3

• 4

• 6

Tags

NGSS.HS-PS1-7

Which of the following equations is balanced? 4.01

• 2H₂ + O₂ → 4H₂O

• 4Na + O₂ → 2Na₂O

• Fe₂O₃ + H₂ → 2Fe + 3H₂O

• CH₄ + O₂ → CO₂ + H₂O

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

Which of the following equations is balanced? 4.01

• 2H₂ + O₂ → 2H₂O

• 2Na + O₂ → 2Na₂O

• FeS + HCl → 2FeCl₂ + H₂S

• NH₄OH → NH₃ + 2H₂O

Tags

NGSS.HS-PS1-7

Which of the following equations is balanced? 4.01

• 2Al + 3O₂ → Al₂O₃

• N₂ + 2H₂ → 2NH₃

• CH₄ + 3O₂ → CO₂ + 2H₂O

• 2Fe2O₃ + 3C → 4Fe + 3CO₂

Tags

NGSS.HS-PS1-7

A chemical equation is shown below.

KNO₃ → KNO₂ + O₂

What are the coefficients that should be added to balance this equation? Use complete sentences to explain your answer.

Explain how this chemical reaction demonstrates the conservation of mass. 4.01

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Tags

NGSS.HS-PS1-7