Compounds Substances and Mixtures

Is Iron (Fe) an element or a compound?

• element

• compound

Answer explanation

Iron (Fe) is an element because it is a pure substance made up of only one type of atom.

How many elements are in H₂O

• 1

• 2

• 3

• 4

Answer explanation

The correct answer is 2 because H2O consists of 2 elements, hydrogen and oxygen.

Tags

NGSS.MS-PS1-1

This picture represents which of the following?

• element

• compound

Answer explanation

The correct choice is 'compound' because the picture represents a combination of different elements bonded together, which is characteristic of a compound.

Tags

NGSS.MS-PS1-1

This picture represents which of the following?

• element

• compound

Answer explanation

The picture represents a compound, as it shows a combination of different elements or substances.

Tags

NGSS.MS-PS1-1

This picture represents which of the following?

• element

• compound

Answer explanation

The picture represents an element, as it shows a single type of atom. Compounds consist of multiple types of atoms bonded together.

Tags

NGSS.MS-PS1-1

When one or more substance is combined it is called __________________.

• compound

• element

• mixture

• solution

Answer explanation

When one or more substances are combined, it is called a compound, which is the correct answer choice.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following statements describes an element?

• It contains only one kind of atom.

• It can be decomposed by ordinary chemical means.

• It is composed of atoms of two or more elements that bond together.

• It has unique properties that are different from the properties of its individual elements.

Answer explanation

The correct statement describing an element is that it contains only one kind of atom.

Which of the following statements describes a compound?

• It contains only one kind of atom.

• It can be separated by physical means.

• It cannot be decomposed into simpler types of substances.

• It consists of atoms of two or more different elements bond together.

Answer explanation

The correct statement describing a compound is that it consists of atoms of two or more different elements bonded together.

Tags

NGSS.MS-PS1-1

Which of the following is an element?

• Gold

• Air

• Water

• Carbon Dioxide

• Nitrous Oxide

Answer explanation

Gold is an element because it is a pure substance made up of only one type of atom.

The periodic table is a chart showing the elements.

• TRUE

• FALSE

Answer explanation

The statement is true because the periodic table is indeed a chart that shows all the known chemical elements.