Substance & Mixtures

What is a pure substance?

• A pure substance is a material that has a constant composition and cannot be separated into simpler substances by physical means.

• A pure substance is a material that can be easily separated into different components

• A pure substance is a material that is a mixture of various elements

• A pure substance is a material that changes its composition frequently

Give an example of a pure substance.

• Water (H2O)

• Salt (NaCl)

• Oxygen (O2)

• Carbon (C)

What is a mixture?

• A mixture is formed by a chemical reaction between two or more materials.

• A mixture is always a solid state substance.

• A mixture is a pure substance with uniform composition.

• A mixture is a substance made by combining two or more different materials without a chemical reaction occurring between them.

Provide an example of a mixture.

• Sand

• Salad

• Water

• Air

How can you separate components in a mixture?

• By blowing air on it

• By singing to it

• By using techniques such as filtration, distillation, chromatography, and evaporation.

• By using magnetism

What are the two types of mixtures?

• pure mixtures

• compound mixtures

• solid mixtures

• homogeneous mixtures, heterogeneous mixtures

Differentiate between homogeneous and heterogeneous mixtures.

• Homogeneous mixtures can be separated by physical means, while heterogeneous mixtures cannot.

• Homogeneous mixtures are always solid, while heterogeneous mixtures are always liquid.

• Homogeneous mixtures have varying composition, while heterogeneous mixtures have uniform composition.

• Homogeneous mixtures have uniform composition, while heterogeneous mixtures have non-uniform composition.

Explain the concept of solubility in mixtures.

• Solubility in mixtures refers to the color of the solution

• Solubility in mixtures is the ability of a substance to evaporate in a solvent

• Solubility in mixtures is related to the temperature of the solvent

• Solubility in mixtures is the ability of a substance to dissolve in a solvent to form a homogeneous solution.

What is a solution?

• A solution is a liquid form of a substance.

• A solution is a solid mixture of substances.

• A solution is a type of gas.

• A solution is a homogeneous mixture composed of two or more substances.

Give an example of a solution.

• A mixture of salt and water

• A pile of rocks

• A rainbow in the sky

• A herd of elephants