What is a pure substance versus a mixture?

A pure substance is made of one type of atom or molecule, while a mixture consists of two or more substances.

A pure substance is a combination of different elements, while a mixture is a single element.

A pure substance can be separated by physical means, while a mixture cannot.

A pure substance has no distinct properties, while a mixture has specific properties.

What is a characteristic of a homogenous mixture?

You can’t see all the parts but they’re still mixed together.

Which of the following is NOT a characteristic of a heterogeneous mixture?

Examples include pizza and lucky charms.

What is the difference between a molecule and a compound?

A molecule is two or more atoms chemically combined, whereas a compound is two or more different atoms chemically combined.

A molecule is two or more different atoms chemically combined, whereas a compound is two or more atoms chemically combined.

A molecule is a single atom, whereas a compound is two or more atoms chemically combined.

A molecule is two or more atoms physically combined, whereas a compound is two or more atoms chemically combined.

Is a molecule always a compound? Why or why not?

No, because a compound must have different atoms combined.

Yes, because all molecules are made of atoms.

Yes, because molecules and compounds are the same.

No, because compounds are only made of one type of atom.

Why are all atoms neutral?

Because they have an equal amount of protons and electrons

Because they have more protons than electrons

Because they have more electrons than protons

Because they have no protons or electrons

What is the main difference between an ionic bond and a covalent bond in terms of electrons?

Ionic bonds involve the transfer of electrons from a metal to a nonmetal.

Ionic bonds involve the sharing of electrons between nonmetals.

Covalent bonds involve the transfer of electrons from a metal to a nonmetal.

Covalent bonds involve the transfer of electrons between metals.

What is the difference between a cation and an anion?

A cation has more protons than electrons, making it positively charged.

A cation has more electrons than protons, making it negatively charged.

An anion has more protons than electrons, making it positively charged.

An anion has more protons than electrons, making it negatively charged.

What happens when a nonmetal takes an electron from a metal?

It forms an anion, which is negatively charged.

It forms a cation, which is positively charged.

It forms a cation, which is negatively charged.

It forms an anion, which is positively charged.

What elements form a cation and an anion?

A metal and a non-metal exchanging electrons.

Two metals exchanging electrons.

Two non-metals exchanging electrons.

A metal and a metalloid exchanging electrons.

What is a greenhouse gas?

A gas that traps heat from the Sun in Earth's atmosphere

A gas that cools the Earth's atmosphere

A gas that is only found in greenhouses

A gas that is used in refrigeration

Unit 3 Structure and Matter Review

Authored by JULIE SERENO

Science

8th Grade

NGSS covered

Used 113+ times

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is an atom?

A basic building block of matter; made of subatomic particles

A basic substance that cannot be simplified

Two or more atoms chemically joined together

Two or more different atoms chemically joined together

What is an element?

A basic building block of matter; made of subatomic particles

A basic substance that cannot be simplified

Two or more atoms chemically joined together

Two or more different atoms chemically joined together

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is a molecule?

A basic building block of matter; made of subatomic particles

A basic substance that cannot be simplified

Two or more atoms chemically joined together

Two or more different atoms chemically joined together

What is a compound?

A basic building block of matter; made of subatomic particles

A basic substance that cannot be simplified

Two or more atoms chemically joined together

Two or more different atoms chemically joined together

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is a subatomic particle with a positive charge found in the nucleus?

Electron

Neutron

Proton

Matter

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which subatomic particle has a negative charge and is found in energy levels outside the nucleus?

Proton

Neutron

Electron

Matter

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is a subatomic particle with no charge found in the nucleus?

Electron

Neutron

Proton

Matter

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Unit 3 Structure and Matter Review

What is an atom?

What is an element?

What is a molecule?

What is a compound?

What is a subatomic particle with a positive charge found in the nucleus?

Which subatomic particle has a negative charge and is found in energy levels outside the nucleus?

What is a subatomic particle with no charge found in the nucleus?

What is anything that has mass and takes up space?

What is the center of the atom that contains the protons and neutrons?

What do the rows on the periodic table represent?

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