Introduction to Chemistry 1st Semester Review

Front

What is a chemical property?

Back

A characteristic of a substance that can only be observed during a chemical reaction, such as flammability or reactivity.

Front

What is the mass number of an atom?

Back

The total number of protons and neutrons in the nucleus of an atom.

Front

What combination of elements forms a covalent compound?

Back

Non-metal + Non-metal.

Front

What is a quantitative observation?

Back

An observation that involves measuring or counting and is expressed numerically, such as measuring mass in grams.

Front

How are the chemical properties of an element determined?

Back

By its electron arrangement.

Front

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

Back

A physical property can be observed without changing the substance's identity, while a chemical property can only be observed during a chemical change.

Front

What is an example of a physical change?

Back

Melting ice into water.

Front

What is the definition of density?

Back

Density is the mass of a substance divided by its volume, often expressed in grams per cubic centimeter (g/cm³).

Front

What is the significance of the atomic number?

Back

The atomic number indicates the number of protons in an atom and determines the element's identity.

Front

What is a covalent bond?

Back

A chemical bond formed when two non-metal atoms share electrons.