Chemistry semester 1 review

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Example: Dissolving salt in water.

Front

Which element has a larger atomic radius: Oxygen (O), Sulfur (S), Tellurium (Te), or Polonium (Po)?

Back

Polonium (Po) has a larger atomic radius than the other elements listed.

Front

What is the charge of an atom that has lost one electron?

Back

The charge of an atom that has lost one electron is +1.

Front

An atom with 2 protons, 3 neutrons, and 4 electrons has a charge of ____?

Back

-2. The charge is calculated as the number of protons (2) minus the number of electrons (4).

Front

In a neutral atom, what is true about the number of protons and electrons?

Back

In a neutral atom, the number of protons is equal to the number of electrons.

Front

What is the definition of an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element.

Front

What are protons?

Back

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

Front

What are neutrons?

Back

Neutrons are neutral subatomic particles found in the nucleus of an atom.

Front

What are electrons?

Back

Electrons are negatively charged subatomic particles that orbit the nucleus of an atom.

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.