Semester Review #1 Unit 1-4

Front

What is element X in the equation \(\frac{235}{92}X\)?

Back

Uranium

Front

Solve and round using Sig Fig math rules: 12.5 mL + 20.05 mL + 2.69 mL

Back

35.2 mL

Front

What are the noble gases classified as?

Back

Element

Front

What type of substance is dry ice (solid carbon dioxide, CO2)?

Back

Pure substance

Front

Solve & Round to Correct Sig Figs: 207 + 2

Back

209

Front

Define a pure substance.

Back

A material with a constant composition and consistent properties throughout.

Front

What is the significance of significant figures in calculations?

Back

They indicate the precision of a measurement.

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

What is a compound?

Back

A substance formed when two or more elements are chemically bonded together.

Front

What is the difference between a homogeneous mixture and a heterogeneous mixture?

Back

A homogeneous mixture has a uniform composition, while a heterogeneous mixture has a non-uniform composition.