HChem Midterm Practice

Front

Who discovered that electrons orbit on rings?

Back

Bohr

Front

What is the measurement of this liquid? Include one uncertain unit.

Back

2.45, 2.44, 2.43, 2.46, 2.47

Front

What kind of chemical bond forms between a metal and a nonmetal?

Back

Ionic bond

Front

Which would be an example of a physical change?

Back

Crushing a can

Front

Which of the following is a test tube?

Back

D

Front

What is the definition of an ionic bond?

Back

A chemical bond formed between two ions with opposite charges.

Front

What is the definition of a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.

Front

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

Back

A physical change alters the form of a substance, while a chemical change alters its chemical composition.

Front

What is the significance of the atomic number?

Back

It represents the number of protons in the nucleus of an atom and determines the element's identity.

Front

What is the role of electrons in chemical bonding?

Back

Electrons are involved in forming bonds between atoms, either by being shared (covalent bonds) or transferred (ionic bonds).