Ch. 3/4 Test: Atoms and Chemical Reactions

Front

What is an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element. It consists of a nucleus containing protons and neutrons, surrounded by electrons.

Front

What are the three main subatomic particles of an atom?

Back

The three main subatomic particles are protons (positively charged), neutrons (neutral), and electrons (negatively charged).

Front

What is a chemical reaction?

Back

A chemical reaction is a process that involves the rearrangement of the molecular or ionic structure of a substance, resulting in the formation of new substances.

Front

What evidence indicates a chemical reaction has occurred?

Back

Evidence of a chemical reaction includes color change, gas production, temperature change, and the formation of a precipitate.

Front

What is the nucleus of an atom?

Back

The nucleus is the central part of an atom, containing protons and neutrons, and it accounts for most of the atom's mass.

Front

What are electrons?

Back

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

Front

What is the formula for sulfuric acid?

Back

The formula for sulfuric acid is H₃SO₄.

Front

What is pressure in the context of gases?

Back

Pressure is the force exerted by gas particles colliding with the walls of their container, measured in units such as atmospheres or pascals.

Front

How does temperature affect gas pressure?

Back

Increasing the temperature of a gas increases its pressure if the volume is constant, due to increased kinetic energy of the gas particles.

Front

What is a chemical formula?

Back

A chemical formula is a way of expressing the composition of a substance using symbols for its constituent elements and numbers to indicate the ratio of atoms.