Elements, Mixtures, and Compounds Review

What is the smallest unit of an element?

• nucleus

• atom

• cell

• molecule

Tags

NGSS.MS-PS1-1

Name the two main types of mixtures.

• Pure mixtures and impure mixtures

• Chemical mixtures and physical mixtures

• Homogeneous mixtures and heterogeneous mixtures

• Solid mixtures and liquid mixtures

What are the properties of compounds?

• Unpredictable composition, complex chemical structure, overlapping physical and chemical properties

• Inconsistent composition, undefined chemical structure, indistinguishable physical and chemical properties

• Variable composition, random chemical structure, similar physical and chemical properties

• Fixed composition, specific chemical structure, distinct physical and chemical properties

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

How many protons are present in the nucleus of an atom?

• Varies with temperature

• Never changes

• Always 6

• Depends on the element

Differentiate between homogeneous and heterogeneous mixtures.

• Homogeneous mixtures have uniform composition, while heterogeneous mixtures have non-uniform composition.

• Homogeneous mixtures have non-uniform composition, while heterogeneous mixtures have uniform composition.

• Homogeneous mixtures are always transparent, while heterogeneous mixtures are always opaque.

• Homogeneous mixtures are always solid, while heterogeneous mixtures are always liquid.

What is the chemical formula for water?

• H3O

• O2H

• H2O

• HO2

Tags

NGSS.MS-PS1-1

What happens to the properties of elements when they combine to form compounds?

• The properties of elements disappear when they combine to form compounds.

• The properties of elements become unpredictable when they combine to form compounds.

• The properties of elements can change when they combine to form compounds.

• The properties of elements remain the same when they combine to form compounds.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Explain the structure of an atom.

• The structure of an atom is composed of a nucleus containing protons and neutrons, surrounded by electrons in energy levels or shells.

• An atom's nucleus is made up of electrons, while protons and neutrons are found in the energy levels.

• Atoms have a single energy level where all protons, neutrons, and electrons are located.

• The structure of an atom consists of only protons and electrons, with no neutrons present.

Tags

NGSS.MS-PS1-1

Give an example of a compound.

• Carbon (C)

• Water (H2O)

• Oxygen (O)

• Nitrogen (N)

Tags

NGSS.MS-PS1-1

How are mixtures different from compounds?

• Mixtures are physically combined substances, compounds are chemically bonded elements.

• Mixtures are chemically bonded elements, compounds are physically combined substances.

• Mixtures and compounds are the same thing.

• Mixtures are always homogeneous, compounds are always heterogeneous.