A compound is a substance that can be broken down into simpler substances and is made from atoms of two or more elements. Which of the following is not a compound?

Air contains about 78% nitrogen and 21% oxygen. What can you conclude from this fact?

A solution is a mixture where one substance is dissolved in another. One example of a solution is salt water. Why does salt water appear to be a single substance even though it contains more than one substance?

Which of these common substances is a homogeneous mixture?

What is true of all mixtures?

A material being examined is the same throughout. The material contains carbon and oxygen, chemically combined. What type of material is it?

Water has the chemical formula H2O. How do the properties of hydrogen (H) and oxygen (O) change when they come together to form water?

Which is true about each group of atoms that makes up a compound?

Susie wants to make lemonade on a hot summer day. She mixes lemon juice, water, and sugar in a large container. Which of the following happens as she combines the ingredients?

What is it called when the particles in a mixture are dispersed within a liquid or gas and will settle out?

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