Chemistry 1 Semester 1 Final Review 24-25

Front

What type of change is represented by the equation Li + Be → B?

Back

Nuclear change.

Front

What is the region around the nucleus of an atom where there is a high probability of finding an electron called?

Back

Orbital.

Front

Which equation represents Charles's Law?

Back

V1/T1 = V2/T2 or V1T2 = V2T1.

Front

How do you calculate the percent by mass of a component in a mixture?

Back

(mass of component / total mass of mixture) x 100.

Front

What is the percent by mass of component C if Component A = 21.8 g, Component B = 27.3 g, and Component C = 35.1 g?

Back

41.7%.

Front

What type of radiation consists of helium nuclei and is the least penetrating?

Back

Alpha radiation.

Front

Define a chemical change.

Back

A process where substances combine or break apart to form new substances.

Front

What is an atom?

Back

The basic unit of a chemical element, consisting of a nucleus surrounded by electrons.

Front

What is a quantum number?

Back

A number that describes the properties of atomic orbitals and the electrons in those orbitals.

Front

What is the difference between physical and chemical changes?

Back

Physical changes do not alter the chemical composition, while chemical changes do.