Introduction to Chemistry

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What is the smallest unit of an element?

An atom is the smallest unit of an element.

What is the chemical symbol for water?

The chemical symbol for water is H2O.

How many elements are in the periodic table?

There are 118 confirmed elements in the periodic table.

What is a substance made of two or more elements called?

A compound is a substance made of two or more elements.

What is the center of an atom called?

The nucleus is the center of an atom.

What is the positively charged particle in the nucleus of an atom?

The proton is the positively charged particle in the nucleus.

What is a chemical reaction?

A chemical reaction is a process where substances change into new substances.

What is a solution?

A solution is a homogeneous mixture of two or more substances.

What do you call a reaction that gives off heat?

An exothermic reaction gives off heat.

What is the negatively charged particle in an atom?

The electron is the negatively charged particle in an atom.

Name the three states of matter.

The three states of matter are solid, liquid, and gas.

What is pH a measure of?

pH is a measure of how acidic or basic a solution is.

What is an element?

An element is a pure substance made of only one type of atom.

What is a neutral particle in the nucleus of an atom?

A neutron is a neutral particle in the nucleus.

What is the term for a change of state from gas to liquid?

Condensation is the change from gas to liquid.