HChem Semester 1 Practice Test

Front

What is the electron configuration for magnesium?

Back

1s² 2s² 2p⁶ 3s²

Front

What shape does the CO₂ molecule have?

Back

Linear

Front

What is a physical change? Give an example.

Back

A physical change is a change that does not alter the chemical composition of a substance. Example: Dissolving salt in water.

Front

What type of bond forms between a metal and a nonmetal?

Back

Ionic bond

Front

How do you round 78.5 to one significant figure?

Back

80

Front

What is the definition of an ionic bond?

Back

An ionic bond is a type of chemical bond that occurs when electrons are transferred from one atom to another, typically between a metal and a nonmetal.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change affects one or more physical properties of a substance without changing its chemical composition, while a chemical change results in the formation of new substances.

Front

What is the molecular geometry of BF₃?

Back

Trigonal planar

Front

What is the significance of significant figures in measurements?

Back

Significant figures indicate the precision of a measurement and help convey the uncertainty in the data.

Front

What is the electron configuration for sodium?

Back

1s² 2s² 2p⁶ 3s¹