Chemistry Semester 1 Review

Front

What are significant figures?

Back

Significant figures are the digits in a number that contribute to its precision. This includes all non-zero digits, any zeros between significant digits, and trailing zeros in the decimal portion.

Front

How many significant figures are in the measurement 0.037010 m?

Back

5 significant figures.

Front

What is the charge of protons in an atom?

Back

Protons have a positive charge.

Front

What must an atom have to be neutral if it has 12 positively charged protons?

Back

It must have 12 electrons.

Front

What is the difference between ionic and covalent compounds in terms of melting point?

Back

Covalent compounds generally have low melting points (less than 200°C), while ionic compounds typically have high melting points.

Front

What is the name of the ionic compound LiNO3?

Back

Lithium nitrate.

Front

Where is most of the mass of an atom located?

Back

Most of the mass of an atom is located in the nucleus.

Front

What are neutrons?

Back

Neutrons are subatomic particles found in the nucleus of an atom that have no charge.

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.

Front

What is the role of electrons in an atom?

Back

Electrons are negatively charged particles that orbit the nucleus and are involved in chemical bonding.