MP4: Flashcard: Laws: Conservation of Mass Definite proportion

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

What happens to the mass of wood when it burns?

Back

The total mass of the ashes and smoke produced from burning wood will equal the original mass of the wood.

Front

True or False: The Law of Conservation of Mass applies only to physical changes.

Back

False. It applies to both physical and chemical changes.

Front

Is a 1 ml sample of water chemically different from a 1,000 ml sample of water?

Back

False. Both samples are chemically the same; they are both water.

Front

What does the Law of Definite Proportions state?

Back

The Law of Definite Proportions states that a chemical compound always contains the same proportion of elements by mass, regardless of the sample size or source.

Front

True or False: A physical change alters the chemical composition of a substance.

Back

False. A physical change does not change the chemical composition.

Front

Give an example of a chemical change.

Back

Burning wood is an example of a chemical change, resulting in ashes and smoke.

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 an example of the Law of Conservation of Mass in a chemical reaction?

Back

In a reaction where hydrogen and oxygen combine to form water, the total mass of hydrogen and oxygen before the reaction equals the mass of water produced.

Front

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

Back

It allows chemists to predict the outcomes of reactions and to balance chemical equations.