Chemistry Exam Review #3

Three isotopes of carbon are indicated below:

How are these isotopes alike?

• They have the same number of protons and the same atomic mass.

• They have the same number of neutrons and the same atomic mass.

• They have the same number of protons and the same atomic number.

• They have the same number of neutrons and the same atomic number.

Which statement correctly compares an atom of boron-11 and an atom of carbon-14?

• An atom of boron-11 has one fewer proton and two fewer neutrons than an atom of carbon-14.

• An atom of boron-11 has one fewer neutron and two fewer protons than an atom of carbon-14.

• An atom of boron-11 has one fewer proton and three fewer neutrons than an atom of carbon-14.

• An atom of boron-11 has one fewer neutron and three fewer protons than an atom of carbon-14.

Tags

NGSS.HS-PS1-8

Which best represents the electron configuration for an atom of iron?

• 1s²2s²2p⁶3s²3p⁶4s²3d⁶

• 1s²1p⁶2s²2p⁶3s²3p⁶4s²

• 1s²2s²2p⁶3s²3p⁶3d⁸

• 1s²2s²2p⁶3s²3p⁶4s²4d⁶

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

How many electrons are in the outermost energy level of an electrically neutral atom of aluminum?

• 13

• 8

• 3

• 2

Tags

NGSS.HS-PS1-1

The nuclear equation below represents the alpha decay of ²²²Rn.

What is the mass number of the element represented by X?

• It is 88, because element X gains 2 protons.

• It is 218, because element X loses 2 protons and 2 neutrons.

• It is 220, because element X loses 2 neutrons.

• It is 226, because element X gains 2 protons and 2 neutrons.

Tags

NGSS.HS-PS1-8

What best compares the properties of ionic and metallic substances?

• The bonds of metallic substances are composed of delocalized electrons, and the bonds of ionic substances are composed of transferred electrons.

• The bonds of metallic substances are composed of isolated electrons, and the bonds of ionic substances are composed of shared electrons.

• A metallic substance insulates heat and electricity, and solid ionic substances conduct heat and electricity.

• A metallic substance has a low melting point, and an ionic substance has a low melting point.

When aluminum and sulfur react, which compound is produced?

• Al₂S₃

• Al₃S₂

• AlS₂

• AlS

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which combination of elements would most likely form an ionic compound?

• hydrogen and oxygen

• carbon and chlorine

• sodium and fluorine

• silicon and sulfur

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which is an accurate comparison of the bonds that can occur between carbon atoms in terms of bond length and strength?

• Double bonds are shorter than single bonds, but single bonds are stronger than triple bonds.

• Triple bonds are shorter than double bonds, and double bonds are stronger than single bonds.

• Double bonds are both shorter and stronger than triple bonds.

• Triple bonds are the longest and strongest.

Which represents the formula for iron(III) chromate?

• Fe₂(CrO₄)₃

• Fe₂(CrO₄)₂

• Fe₃(CrO₄)₂

• Fe₃(CrO₄)₃