Chemistry Midterm Review

How many electron pairs are shared between the atoms in an N₂ molecule?

• 1

• 2

• 3

• 4

How would you classify NaCl?

• element

• compound

• heterogeneous mixture

• homogeneous mixture

Tags

NGSS.MS-PS1-1

In an atom, an orbital represents

• the most probably location of a proton

• the most probable location of an electron

• the least probably location of a neutron

• photons emitted as electrons move to lower energy levels

During a flame test, sodium chloride produces an intense yellow flame. This yellow color is produced when electrons in excited atoms

• are gained by the atoms

• are lost by the atoms

• move to higher energy states within the atoms

• move to lower energy states within the atoms

Tags

NGSS.HS-PS1-2

Which of the following is a balanced chemical equation for the reaction between hydrogen gas and oxygen gas to form water?

Tags

NGSS.HS-PS1-7

Which of the following is a product of a combustion reaction?

• Water

• Sodium Chloride

• Carbon Dioxide

• Both A and C

Tags

DOK Level 1: Recall

What is the main difference between a combustion reaction and a synthesis reaction?

• Combustion must involve oxygen, while synthesis does not.

• Synthesis produces a single product, while combustion can produce multiple products.

• Combustion releases energy, while synthesis absorbs energy.

• Synthesis involves only one reactant, while combustion requires two or more.

Which of the following is an example of a single replacement reaction?

Tags

NGSS.HS-PS1-7

Match the following properties with their classification as either an intensive or extensive property.

• Amount of matter in an object

• Silver

• Appearance of an object

• Mass

• Color of an object

• Metallic

• Temperature at which an object changes from solid to liquid

• Melting point

• Synthesis

• Decomposition

• Single displacement

• Combustion

Tags

NGSS.MS-PS1-2