Star Flashcard (1st 9 wks PS)

Front

What is water?

Back

Water is a clear, colorless liquid that is essential for all forms of life. It is made up of two hydrogen atoms and one oxygen atom (H2O).

Front

What is a chemical change?

Back

A chemical change occurs when a substance transforms into a new substance with different properties, such as when iron rusts or wood burns.

Front

What are reactants in a chemical equation?

Back

Reactants are the substances that undergo a chemical change in a reaction, found on the left side of the arrow in a chemical equation.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances where each retains its own properties. Mixtures can be homogeneous or heterogeneous.

Front

What is a heterogeneous mixture?

Back

A heterogeneous mixture is one where the components are not uniformly distributed and can be easily distinguished, like sand and water.

Front

What is density?

Back

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

Front

What happens to an object that is less dense than water?

Back

An object that is less dense than water will float when placed in water.

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, such as melting ice.

Front

What are products in a chemical equation?

Back

Products are the substances that are formed as a result of a chemical reaction, found on the right side of the arrow in a chemical equation.

Front

What is a homogeneous mixture?

Back

A homogeneous mixture is one where the components are evenly distributed and cannot be easily distinguished, like saltwater.