Pure and Impure Substances

1. ___________ are the smallest unit of an element that maintains the properties of that element.

2. A/An _______________ is made up of one or more of the same kind of atom chemically combined.

3. A/an _____________ contains a variety of elements and compounds that are not chemically combined with each other.

4. A __________________ is a substance that has definite physical and chemical properties such as appearance, melting point, and reactivity.

5. True or False: elements and compounds are pure substances.

6. Elements are broadly classified as metals, nonmetals, and _________________.

7. Coffee, mouthwash, and vinegar are examples of __________________ mixtures.

8. Baking soda is the common name for sodium bicarbonate, or NaHCO3. It can be produced through chemical reactions involving carbon dioxide and sodium hydroxide. It is a

9. Blood is a fluid found in the bodies of humans and other animals. It can be physically separated into plasma, red blood cells and white blood cells. Blood is a ___________________

10. Ammonia is a colourless gas with the formula NH3. Ammonia contains hydrogen and nitrogen and cannot be broken down physically. Ammonia is a ___________________ .