Compounds, Elements and Mixtures

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.

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

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

Give an example of a compound.

• Carbon (C)

• Water (H2O)

• Oxygen (O)

• Nitrogen (N)

Tags

NGSS.MS-PS1-1

What does this diagram represent?

• Elements

• Compounds

• Mixture of Elements and Compunds

• Mixture of Compounds

Tags

NGSS.MS-PS1-1

Which of the following is made up of only one type of atom?

• Element

• Compund

• Mixture