Pure Substance vs Mixture

What is a pure substance?

• A type of matter made up of only one element or compound

• A type of matter made up of two or more pure substances

• A mixture of different elements

• A substance that can be easily separated into its components

Which of the following is an example of a homogeneous mixture?

• Stew

• Granite

• Tea

• Salad

What is a characteristic of heterogeneous mixtures?

• They have a uniform composition

• They are made up of only one type of element or compound

• Their components can be seen and distinguished from each other

• They are also known as solutions

Which of the following statements is true about homogeneous mixtures?

• They have a non-uniform distribution of components

• They are made up of multiple pure substances

• They can be easily separated into their components

• They are made up of only one type of element or compound

Why is air considered a homogeneous mixture?

• Because it is made up of only one type of gas

• Because it has a non-uniform distribution of gases

• Because it is made up of different gases like nitrogen and oxygen

• Because it can be easily separated into its components

Tags

NGSS.MS-PS1-1

What is the importance of understanding the difference between pure substances, homogeneous mixtures, and heterogeneous mixtures in chemistry?

• To create new elements

• To understand their properties and create new products

• To separate mixtures into pure substances

• To study the behavior of gases

Which of the following is an example of a heterogeneous mixture?

• Salt water

• Milk

• Sand and iron filings

• Vinegar

What is a characteristic of pure substances?

• They can be separated into simpler substances by physical means

• They have a fixed composition

• They are always compounds

• They have variable properties

What is a common characteristic of all mixtures?

• They have a fixed composition

• They can be separated into their components by physical means

• They are always homogeneous

• They are always heterogeneous

Which of the following is an example of a pure substance?

• Salt water

• Air

• Gold

• Milk