HMH Module J Unit 3 Science Test

In the chemical equation 3C₂H₄, how many atoms of carbon are represented?

• 2

• 3

• 5

• 6

Tags

NGSS.MS-PS1-1

Which types of changes observe the law of conservation of mass?

• A. only changes of state

• B. only physical changes

• C. only chemical changes

• D. physical changes and chemical changes

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Ethane, C₂H₆, is one of many compounds that burns in oxygen to form carbon dioxide and water.

C₂H₆ + O₂ → CO₂ + H₂O

What is true of the chemical equation shown?

• A. The positions of the reactants and the products are reversed.

• B. The formulas of the reactants and the products are not correct.

• C. The equation is not balanced, so it does not show conservation of mass.

• D. The types of atoms present on the reactant side are not the same as those on the product side.

Tags

NGSS.MS-PS1-5

Glucose, C₆H₁₂O₆, is a kind of sugar molecule. How many atoms are in a molecule of glucose?

• A. 6

• B. 12

• C. 18

• D. 24

Tags

NGSS.MS-PS1-1

The fuel butane, C₄H₁₀, reacts with oxygen, O₂, to form water, H₂O, and carbon dioxide, CO₂. Which of these best describes the carbon atoms involved in this reaction?

• A. The number of carbon atoms does not change.

• B. Three carbon atoms are formed in the reaction.

• C. Three carbon atoms are destroyed in the reaction.

• D. The arrangement of carbon atoms does not change.

Tags

NGSS.MS-PS1-5

The model shows a single unit of a compound containing several elements. Which of these is the chemical formula for the substance?

• Al₂SO₄

• Al₂(SO₃)₄

• Al₂(SO₄)₃

• (AlO)₂(SO₄)₃

Tags

NGSS.MS-PS1-1

Zinc and hydrochloric acid are combined in a test tube. What can you conclude about the chemical reaction taking place? Select all that apply.

• The mass of the products is exactly the same as the mass of the reactants.

• One new product formed is a gas.

• Molecules are changing into different molecules.

• Atoms are changing into different atoms.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The photo shows the reaction between zinc and hydrochloric acid that forms zinc chloride and hydrogen gas. Which of these is a correctly balanced equation that models the reaction?

• Zn + HCl → ZnCl₂ + H₂

• Zn + 2HCl → ZnCl₂ + 2H₂

• Zn + 2HCl --> ZnCl₂ + H₂

• Zn + 4HCl --> ZnCl₂ + 2H₂

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is shown by this balanced chemical equation? Select all that apply.

H₂ + Cl₂ → 2HCl

• The atoms in the original substances regroup and form a different substance.

• The product is a new substance made up of different atoms than the reactants.

• The total number of atoms changes in the reaction.

• The same atoms are present before and after the reaction.

• Matter is conserved.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

How many oxygen (O) atoms are involved in this chemical reaction?

2Fe(OH)₃ → Fe₂O₃ + 3H₂O

• 12

• 6

• 3

• 2

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5