Atoms, Elements and Compounds

Select the correct definition for an atom.

• The smallest part of an element that can exist.

• A substance made of only one type of atom.

• A substance made of more than one type of atom that are chemically bonded together.

• A substance made of more than one type of atom that are not chemically bonded together.

Answer explanation

The correct definition for an atom is the smallest part of an element that can exist.

Select the correct definition for an element.

• The smallest part of an element that can exist.

• A substance made of only one type of atom.

• A substance made of more than one type of atom that are chemically bonded together.

• A substance made of more than one type of atom that are not chemically bonded together.

Answer explanation

A substance made of only one type of atom is the correct definition for an element.

Select the correct definition for a compound.

• The smallest part of an element that can exist.

• A substance made of only one type of atom.

• A substance made of more than one type of atom that are chemically bonded together.

• A substance made of more than one type of atom that are not chemically bonded together.

Answer explanation

A compound is a substance made of more than one type of atom that are chemically bonded together.

Elements can be found on the ________ table.

Select the diagram that shows an atom.

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Tags

NGSS.MS-PS1-1

Select the diagram that shows an element.

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Tags

NGSS.MS-PS1-1

Select the diagram that shows a compound.

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Tags

NGSS.MS-PS1-1

Select the elements from this list.

• Carbon dioxide

• Hydrogen

• Nitrogen

• Hydrochloric acid

• Iron

Answer explanation

Select elements from the list means choosing items that are present in the list. Hydrogen, Nitrogen, and Iron are elements listed, so they are the correct choices.

Tags

NGSS.MS-PS1-1

Select the compounds from this list.

• Carbon dioxide

• Methane

• Nitrogen

• Hydrochloric acid

• Iron

Answer explanation

The compounds from the list are Carbon dioxide, Hydrochloric acid, and Methane as they are chemical compounds composed of different elements.

Tags

NGSS.MS-PS1-1

Select the compounds from this list.

• O₂

• CO₂

• HCl

• CH₄

• Fe

Answer explanation

The compounds in the list are CO2, CH4, and HCl because they are combinations of different elements bonded together, while O2 and Fe are elements on their own.

Tags

NGSS.MS-PS1-1