Chemistry Midterm Practice

Front

What determines the identity of an element?

Back

The number of protons in the nucleus.

Front

What is a true statement about a chemical change?

Back

A chemical change results in a change in energy AND a change in the amount of matter.

Front

If isotope A has a larger mass than isotope B, what can be said about the number of neutrons?

Back

Isotope A has a greater number of neutrons than isotope B.

Front

How do you calculate percentage error?

Back

Percentage Error = (|Measured Value - Known Value| / Known Value) x 100%.

Front

What is the most dominant intermolecular force between CO2 molecules?

Back

London dispersion forces.

Front

Define protons.

Back

Protons are positively charged subatomic particles found in the nucleus of an atom.

Front

What is a chemical change?

Back

A process where substances transform into different substances, involving changes in energy and matter.

Front

What are neutrons?

Back

Neutrons are neutral subatomic particles found in the nucleus of an atom, contributing to its mass.

Front

What are intermolecular forces?

Back

Forces that occur between molecules, affecting their physical properties.

Front

What is the difference between covalent bonds and hydrogen bonds?

Back

Covalent bonds involve the sharing of electrons between atoms, while hydrogen bonds are weak attractions between a hydrogen atom and an electronegative atom.