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What is the difference between a mixture and a pure substance?

A mixture is made up of only one type of substance, while a pure substance is made up of two or more substances.

A mixture is made up of two or more substances that are chemically combined, while a pure substance is made up of only one type of substance.

A mixture is made up of two or more substances that are physically combined, while a pure substance is made up of only one type of substance. (correct)

A mixture is made up of two or more substances that have different properties, while a pure substance is made up of only one substance with the same properties.

What is a physical change?

A change in which the physical properties of a substance are altered. (correct)

A change in which the temperature of a substance is altered.

A change in which a new substance is formed.

A change in which the chemical composition of a substance is altered.

What is a chemical change?

A change in which the chemical composition of a substance is altered. (correct)

A change in which a new substance is formed.

A change in which the temperature of a substance is altered.

A change in which the physical properties of a substance are altered.

What is meant by reactants and products?

Reactants are the substances that are used up during a chemical reaction, while products are the substances that are formed. Signup and view all the answers

What happens to the mass of reactants and products during a reaction?

The mass of reactants and products remain the same. Signup and view all the answers

What is the difference between a mixture and a pure substance?

A mixture is a combination of two or more substances that are not chemically combined, while a pure substance is made up of only one type of atom or molecule Signup and view all the answers

What is the Law of Conservation of Mass?

The mass of reactants equals the mass of products in a chemical reaction Signup and view all the answers

What are the physical properties of alkali metals?

Softness and reactivity with water Signup and view all the answers

How can one predict the state of a substance at a given temperature?

By using its melting and boiling points Signup and view all the answers

What is chromatography used for?

To separate an insoluble solid from a liquid Signup and view all the answers

What is the difference between a mixture and a pure substance?

A mixture is a combination of two or more substances that are not chemically combined, while a pure substance is made up of only one type of atom or molecule. Signup and view all the answers

What physical properties can vary greatly between metal and non-metal elements?

Melting and boiling points, electrical and thermal conductivity, state, shininess, malleability, ductility, and brittleness. Signup and view all the answers