Chemistry Semester I Final Review

An atom is:

• The smallest unit of a chemical element

• A type of molecule

• A large particle

• A chemical reaction

Tags

NGSS.MS-PS1-1

What are the 3 subatomic particles in an atom and their respective charges?

• Protons, Neutrons, Electrons; Positive, Neutral, Negative

• Protons, Neutrons, Electrons; Negative, Neutral, Positive

• Protons, Neutrons, Electrons; Neutral, Positive, Negative

• Protons, Neutrons, Electrons; Positive, Negative, Neutral

What does the atomic number on the periodic table tell you about an atom?

• The number of protons in the nucleus

• The number of neutrons in the nucleus

• The number of electrons in the outer shell

• The atomic mass of the atom

What is average atomic mass?

• The sum of the masses of all isotopes of an element

• The weighted average of the masses of the isotopes of an element

• The mass of the most abundant isotope of an element

• The average mass of an atom of an element

What is an isotope?

• A molecule with a different number of electrons

• An atom with a different number of protons

• An atom with a different number of neutrons

• A molecule with a different number of atoms

Tags

NGSS.HS-PS1-8

What is a physical property? Give an example.

• A characteristic that can be observed or measured without changing the substance's identity, such as color or melting point.

• A characteristic that involves a substance's ability to undergo a specific chemical change, such as flammability.

• A property that describes the amount of matter in an object, such as mass or volume.

• A property that describes the energy change during a chemical reaction, such as enthalpy.

What is a chemical property? Give an example.

• A characteristic that can be observed without changing the substance's chemical identity

• A characteristic that describes the ability of a substance to undergo a specific chemical change. An example includes flammability.

• A property that involves a change in the state of matter

• A property that can be measured using physical means

What is mass?

• A measure of the amount of matter in an object

• The force exerted by gravity on an object

• The volume of an object

• The density of an object

Tags

NGSS.HS-PS1-7

What is a mixture?

• A combination of two or more substances that are chemically bonded

• A combination of two or more substances that are not chemically bonded

• A single pure substance

• A chemical reaction between two substances

What are the two types of mixtures? Give an example of each type.

• Homogeneous and heterogeneous; saltwater and salad

• Solid and liquid; ice and water

• Chemical and physical; rust and sand

• Organic and inorganic; sugar and salt