Exploring Mass and Composition in Chemistry

Front

What does the Law of Constant Composition state?

Back

A given compound always contains the same elements in the same proportion by mass.

Front

Provide an example of a compound with a constant composition.

Back

Water (H₂O) always contains 2 hydrogen atoms and 1 oxygen atom.

Front

What is the first step of the scientific method?

Back

Observation.

Front

If 10 grams of hydrogen react with 80 grams of oxygen, what is the total mass of water produced?

Back

90 grams.

Front

What is the Law of Definite Proportions?

Back

It states that a chemical compound always contains its component elements in fixed ratio by mass.

Front

What is a compound?

Back

A substance formed when two or more elements are chemically bonded together.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance that cannot be broken down into simpler substances, while a compound is made up of two or more elements chemically combined.

Front

What is the formula for calculating mass in a chemical reaction?

Back

Mass of reactants = Mass of products.

Front

What is the significance of the Law of Conservation of Mass?

Back

It states that mass is neither created nor destroyed in a chemical reaction.

Front

What is a hypothesis in the scientific method?

Back

A proposed explanation for a phenomenon, which can be tested through experimentation.