Chem 1 Worksheet #1 Text Reference: Pgs 10-18 Name ____________________________

Vocabulary: Mass, Matter, Atom, Element, Compound, Extensive Properties, Intensive Properties, Physical Property/Change, Chemical Property/Change, States of Matter, Solid, Liquid, Gas, Chemical Reaction, Reactants, Products, Mixture, Homogeneous Mixture, Heterogeneous Mixture, Pure Substance, Filtration, Distillation

Summary: The properties of various forms of matter are discussed and they are classified in a number of ways. The difference between chemical and physical change is discussed and clues for each are explained in class. A couple of separation methods are described and the basics of writing a chemical reaction in terms of reactants and products are shown.

Questions:

1) Matter is anything that has ____________ and takes up space.

2) An element is a pure substance made up of only one kind of _____________.

3) What is the difference between a compound and an element?

4) Classify each of the following as an element or a compound: H₂O___________ O₂ ____________

5) Classify each as an extensive or and intensive property.

Mass ________________ Density ________________ Color________________

Conductivity ________________ Volume _________________ Freezing point _________________

6) Describe the difference between a chemical and a physical change

7) Classify each as a physical or a chemical change: (Use "P" for physical and "C" for chemical)

Hair curls when the humidity increases _________

Meat blackens when cooked too long on a barbecue ________

Champagne bubbles when the cork is removed _______

The steel in a car has rust spots _______

Alcohol burns forming carbon dioxide and water _______

Milk curdles if a few drops of vinegar are added _______

Salad dressing separates into layers after standing _______

Spilling acid on cotton jeans creates a hole in them ______

Dry ice gradually vaporizes ________

Sugar dissolves in water ______

Alka Seltzer neutralizes stomach acid _____

8) How does a solid, a liquid and a gas differ?

9) Discuss the difference between a mixture and a pure substance.

10) Classify each of the following as a pure substance, a homogeneous mixture or a heterogeneous mixture.

milk _____________________ a teaspoon of sugar ____________________

wood ____________________ aluminum foil _______________________

salad dressing ________________ a bag of various colored marbles __________________

steel __________ ________ a teaspoon of sugar dissolved in water ________________

pond water __________________ beach sand ________________________

air ______________________ blood ___________________________

11) Which of the above could be classified as a "solution"? (hint: there are 4 or 5)

12) What process would you use to separate a mixture of 3 liquids, all with different boiling points ?

13) For the following chemical reaction, sodium + water à hydrogen + sodium hydroxide

What two substances are the reactants? _____________, ________________

(Obviously, the products are the other 2 substances)

What word could we substitute for the arrow? _______________