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Chemistry: Periodic Table, Atoms, Molecules, Elements, Mixtures

Authored by Wendy King

Chemistry

8th Grade

Used 3+ times

Chemistry: Periodic Table, Atoms, Molecules, Elements, Mixtures
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15 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the smallest unit of an element that maintains the properties of that element?

Molecule

Atom

Compound

Mixture

Answer explanation

The smallest unit of an element that maintains its properties is an atom. Atoms are the building blocks of all matter and cannot be broken down further.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is NOT a characteristic of metals on the Periodic Table?

Conduct electricity

Are shiny

Are brittle

Can be hammered into shapes (malleable)

Answer explanation

The characteristic 'Are brittle' is not associated with metals on the Periodic Table.

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many atoms are in a molecule of water (H2O)?

2

3

4

5

Answer explanation

A molecule of water (H2O) consists of 3 atoms: 2 hydrogen atoms and 1 oxygen atom. Therefore, the correct answer is 3.

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What distinguishes an element from a compound?

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

Compounds consist of only one type of atom.

Elements consist of only one type of atom.

Compounds can exist in any state of matter at room temperature.

Answer explanation

An element consists of only one type of atom, distinguishing it from a compound.

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is a mixture?

Water (H2O)

Salt (NaCl)

Air

Gold (Au)

Answer explanation

Air is a mixture because it is composed of different gases, such as nitrogen, oxygen, and carbon dioxide. It is not a pure substance like water or gold.

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the atomic number of an element?

The number of protons in the nucleus

The total number of protons and neutrons in the nucleus

The number of electrons surrounding the nucleus

The total mass of the element

Answer explanation

The atomic number of an element is the number of protons in the nucleus, which determines its chemical properties.

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is true about isotopes?

They have different numbers of protons.

They have different numbers of electrons.

They have different numbers of neutrons.

They are different elements.

Answer explanation

Isotopes are atoms of the same element with different numbers of neutrons. This distinguishes them from other answer choices.

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