Which of the following pairs correctly matches an element and a compound?

$$O_2$$ (element), $$CO_2$$ (compound)

$$NaCl$$ (element), $$H_2$$ (compound)

$$H_2O$$ (element), $$O_2$$ (compound)

$$C_6H_{12}O_6$$ (element), $$Fe$$ (compound)

Which of the following best explains why $$CO_2$$ is considered a compound?

It is made up of two or more different elements chemically combined.

It contains only one type of atom.

It can be separated by physical means.

A student is given two samples: one is $$O_2$$ and the other is $$H_2O$$ . How can the student determine which is an element and which is a compound using chemical formulas?

By checking which formula has more than one type of atom

By checking which formula has more than one molecule

By checking which formula has more than one letter

By checking which formula is longer

A scientist discovers a new substance with the chemical formula $$X_2Y$$ . Based on this formula, what can you infer about the substance?

It is a compound because it contains two different types of atoms.

It is an element because it has only one type of atom.

It is a mixture because it has more than one letter.

It is a solution because it has two elements.

Compare and contrast $$H_2$$ and $$H_2O$$ in terms of their chemical composition and classification.

$$H_2$$ is an element made of two hydrogen atoms; $$H_2O$$ is a compound made of hydrogen and oxygen atoms.

Both are elements because they contain hydrogen.

Both are compounds because they have more than one atom.

$$H_2$$ is a compound; $$H_2O$$ is an element.

A student claims that $$NaCl$$ and $$Cl_2$$ are both compounds because they both have more than one atom. Use your knowledge of chemical symbols and formulas to evaluate this claim.

The claim is incorrect; $$NaCl$$ is a compound, but $$Cl_2$$ is an element because it contains only chlorine atoms.

The claim is correct because both have more than one atom.

The claim is incorrect; both are elements.

The claim is correct because both are made of molecules.

Elements and Compounds Practice

Authored by Riley Nelson

Science

7th Grade

NGSS covered

Used 17+ times

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MULTIPLE CHOICE QUESTION

30 mins • 1 pt

Which of the following is an example of an element?

MULTIPLE CHOICE QUESTION

30 mins • 1 pt

What does a chemical formula represent?

The number of atoms in a molecule

The types and numbers of atoms in a substance

The physical state of a substance

The color of a substance

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

30 mins • 1 pt

Which of the following is a compound?

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

30 mins • 1 pt

What is the chemical symbol for sodium?

MULTIPLE CHOICE QUESTION

30 mins • 1 pt

Which of the following statements is true about elements?

Elements are made up of only one type of atom.

Elements are made up of two or more types of atoms.

Elements can be broken down into simpler substances by chemical means.

Elements always exist as molecules.

MULTIPLE CHOICE QUESTION

30 mins • 1 pt

Which of the following best describes a molecule?

A single atom of an element

Two or more atoms chemically bonded together

A mixture of different substances

A physical change in matter

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

30 mins • 1 pt

Which of the following is a correct chemical formula for a compound?

Tags

NGSS.MS-PS1-1

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Elements and Compounds Practice

Which of the following is an example of an element?

What does a chemical formula represent?

Which of the following is a compound?

What is the chemical symbol for sodium?

Which of the following statements is true about elements?

Which of the following best describes a molecule?

Which of the following is a correct chemical formula for a compound?

Which of the following pairs correctly matches an element and a compound?

If a substance is made of only one kind of atom, what is it called?

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