What does the mass number indicate about an atom?

Total number of protons and neutrons

Why is water considered a polar molecule?

Because it has an uneven balance of charge

Because it is held together by ionic bonds

Because the hydrogen atoms hog the electrons

Because there is a lot of frozen water at the North Pole

How do you calculate an atom’s mass number?

Add the number of protons and neutrons

Subtract the number of electrons from protons

Multiply the number of protons by neutrons

Divide the number of protons by electrons

What is a rule for making a neutral atom (one with 0 overall charge)?

The number of protons equals the number of electrons

The number of neutrons equals the number of electrons

The number of protons equals the number of neutrons

The number of protons is double the number of electrons

Which amount of particles is correct for an atom of carbon-14, with a charge of -2?

6 protons, 8 neutrons, 8 electrons

6 protons, 8 neutrons, 6 electrons

6 protons, 6 neutrons, 8 electrons

6 protons, 6 neutrons, 6 electrons

In this chemical equation, which are the reactants and which are the products: Mg + 2HCl → MgCl2 + H2?

Reactants: Mg, 2HCl; Products: MgCl2, H2

Reactants: MgCl2, H2; Products: Mg, 2HCl

Reactants: Mg, MgCl2; Products: 2HCl, H2

Reactants: H2, MgCl2; Products: Mg, 2HCl

Which two steps need to take place for an ionic bond to occur, using the formation of table salt as an example?

Transfer of electrons from sodium to chlorine and the attraction of two oppositely charged atoms.

Sharing of electrons between sodium and chlorine, and then a transfer of electrons.

Sodium and chlorine become oppositely charged, and then the formation of a covalent bond between sodium and chlorine occurs.

Transfer of electrons from chlorine to sodium and the attraction of two oppositely charged atoms.

Water is a polar molecule because:

It has an unequal distribution of charge.

It is composed of covalent bonds.

It has an equal distribution of charge.

What is the difference between a mixture and a compound? Choose the correct example of each.

A mixture is a combination of substances that retain their individual properties, like sand and salt. A compound is a substance formed when two or more elements are chemically bonded, like water (H2O).

A mixture is a substance formed when two or more elements are chemically bonded, like water (H2O). A compound is a combination of substances that retain their individual properties, like sand and salt.

A mixture is a combination of substances that lose their individual properties, like water (H2O). A compound is a combination of substances that retain their individual properties, like sand and salt.

A mixture is a combination of substances that retain their individual properties, like water (H2O). A compound is a substance formed when two or more elements are chemically bonded, like sand and salt.

Chemistry Unit Exam: REVIEW

Authored by Elisa Arias

Chemistry

10th Grade

NGSS covered

Used 5+ times

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55 questions

Show all answers

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is a compound?

A single element

A physical blend of substances

A mixture of elements

A substance composed of atoms of 2 or more elements chemically combined

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the chemical formula for water?

CH3COOH

NaCl

H2O

CH4

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the chemical formula for salt?

CH4

H2O

NaCl

CH3COOH

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What type of bond is formed when atoms share electrons?

Covalent bond

Hydrogen bond

Ionic bond

Metallic bond

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is an ionic bond?

A bond formed by the attraction of two similar atoms

A bond formed by the attraction of two oppositely charged atoms

A bond formed by the sharing of protons

A bond formed by sharing electrons

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-3

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is an example of an ionic compound?

Sodium chloride (NaCl)

Oxygen (O2)

Methane (CH4)

Water (H2O)

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What property of water makes it a universal solvent?

Viscosity

Polarity

Temperature

Density

Tags

NGSS.HS-ESS2-5

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Chemistry Unit Exam: REVIEW

What is a compound?

What is the chemical formula for water?

What is the chemical formula for salt?

What type of bond is formed when atoms share electrons?

What is an ionic bond?

Which of the following is an example of an ionic compound?

What property of water makes it a universal solvent?

Which of the following is NOT a particle found in an atom?

What is the charge of a neutron?

What happens to the charges of protons and electrons in a standard atom?

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