Elements, Compounds, and Mixtures/Balancing Equations

Front

What is the definition of an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. It consists of only one type of atom.

Front

What is a compound?

Back

A compound is a substance formed when two or more different elements are chemically bonded together in a fixed ratio.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded and can be separated by physical means.

Front

What is the difference between a homogeneous mixture and a heterogeneous mixture?

Back

A homogeneous mixture has a uniform composition throughout, while a heterogeneous mixture has a non-uniform composition with distinct phases.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.

Front

How do you determine the coefficient in a chemical equation?

Back

The coefficient in a chemical equation indicates the number of molecules or moles of a substance involved in the reaction.

Front

What is an example of a homogeneous mixture?

Back

An example of a homogeneous mixture is saltwater, where the salt is completely dissolved in water.

Front

What is an example of a heterogeneous mixture?

Back

An example of a heterogeneous mixture is a salad, where the individual components can be seen and separated.

Front

What happens to the mass of an ice cube when it melts?

Back

The mass of the ice cube remains the same when it melts; it will still weigh 20 grams.

Front

What is the significance of the coefficient in the formula 3H2O?

Back

The coefficient 3 indicates that there are three molecules of water (H2O) in the reaction.