Benchmark 1 7th Grade

Count the carbon atoms in this molecule. Hint: The symbol for carbon is C. How many carbon atoms are there?

• 1

• 2

• 3

• 4

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7.PS1.1

How many chlorine atoms are there in one molecule of CH₂Cl₂? Hint: The symbol for chlorine is Cl.

• 1

• 2

• 3

• 4

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7.PS1.1

Count the chlorine atoms in this molecule. Hint: The symbol for chlorine is Cl. How many chlorine atoms are there?

• 3

• 1

• 2

• 4

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7.PS1.1

Count the oxygen atoms in this molecule. Hint: The symbol for oxygen is O. How many oxygen atoms are there?

• 1

• 2

• 3

• 4

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7.PS1.1

Helium is a gas that is less dense than air. So, helium is often used to fill balloons to make them float. The chemical formula for helium is He. Complete the statement. Helium is ______________________.

• an elementary substance

• a compound

• a mixture

• a solution

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7.PS1.1

Sodium fluoride is used in toothpaste to help prevent cavities. The chemical formula for sodium fluoride is NaF. Complete the statement. Sodium fluoride is ______________________.

• an elementary substance

• a compound

• a mixture

• a solution

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7.PS1.1

Liquid bromine is made in chemical factories. It can be used to make couches and mattresses that are fire-resistant. The chemical formula for bromine is Br₂. Complete the statement. Bromine is ______________________.

• an elementary substance

• a compound

• a mixture

• a solution

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7.PS1.1

Carbon tetrachloride was once used in fire extinguishers. It is no longer used because it is poisonous. The chemical formula for carbon tetrachloride is CCl₄. Complete the statement. Carbon tetrachloride is ____________________.

• a compound

• an element

• a mixture

• a solution

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7.PS1.1

Different substances can have one or more chemical elements in common. So, the chemical formulas and models of these substances may look similar. Which model represents the substance with the chemical formula RbBr?

• silver bromide

• rubidium bromide

• rubidium chloride

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7.PS1.1

Every substance can be represented by a chemical formula. The chemical formula tells you which chemical elements the substance is made of. In a chemical formula, each chemical element is represented by its atomic symbol. The models below represent molecules of three different substances. Each substance has a different chemical formula. Select the model that represents a molecule of the substance with the chemical formula ICl.

• iodine monochloride

• hydrogen sulfide

• bromine

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7.PS1.1