Chemistry Exam Review

Front

What are valence electrons?

Back

Valence electrons are the outer shell electrons of an atom that are involved in chemical bonding.

Front

How many significant figures are in the number 0.002700?

Back

There are 4 significant figures in the number 0.002700.

Front

What is the name of the compound CBr4?

Back

The name of the compound CBr4 is Carbon tetrabromide.

Front

What is a heterogeneous mixture?

Back

A heterogeneous mixture is a mixture that consists of different substances or phases that can be easily distinguished.

Front

What is the difference between accuracy and precision?

Back

Accuracy refers to how close a measured value is to the true value, while precision refers to how consistent repeated measurements are.

Front

Define a chemical reaction.

Back

A chemical reaction is a process in which substances (reactants) are transformed into different substances (products) through the breaking and forming of chemical bonds.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.

Front

What is the pH scale?

Back

The pH scale measures the acidity or basicity of a solution, ranging from 0 (acidic) to 14 (basic), with 7 being neutral.

Front

What is an ionic bond?

Back

An ionic bond is a type of chemical bond formed through the electrostatic attraction between oppositely charged ions.

Front

What is a covalent bond?

Back

A covalent bond is a type of chemical bond where two atoms share one or more pairs of electrons.