Chemistry Flashcard

Front

What is a chemical change?

Back

A chemical change is a process where substances combine or break apart to form new substances, often accompanied by energy changes, such as temperature increase.

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.

Front

What is a compound?

Back

A compound is a substance formed when two or more elements chemically bond together in fixed proportions.

Front

What is the formula for potassium sulfate?

Back

The formula for potassium sulfate is K₂(SO₄)₂.

Front

How many atoms are in one formula unit of magnesium hydroxide, Mg(OH)₂?

Back

There are 5 atoms in one formula unit of magnesium hydroxide (1 magnesium, 2 oxygen, and 2 hydrogen).

Front

What are metals?

Back

Metals are elements that are typically shiny, good conductors of heat and electricity, and malleable.

Front

What are nonmetals?

Back

Nonmetals are elements that lack the characteristics of metals, often being poor conductors and brittle in solid form.

Front

What are metalloids?

Back

Metalloids are elements that have properties of both metals and nonmetals, often used as semiconductors.

Front

What is the significance of the periodic table?

Back

The periodic table organizes elements based on their atomic number, electron configuration, and recurring chemical properties.

Front

What is the difference between an atom and a molecule?

Back

An atom is the smallest unit of an element, while a molecule is a group of two or more atoms bonded together.