1. Chemistry
Created by Educational Technology Network

2. 10 20 30 40 50 Chemical and Physical Properties
Chemical and Physical Change
Energy and Reactions
Cons of Mass and Balancing
Random 10 20 30 40 50

3. Question
1 kg of the compound toluene melts at -95oC . At what temperature will 500 g of toluene melt?

4. Answer 1 – 10
-95oC

5. Question
What is a chemical property of iron?

6. Answer 1 – 20
It will react with water and oxygen to form rust.

7. Question
Study the list of processes that can bring about chemical and physical changes below. Then answer the question that follows. A. Cooking oil was splashed on a hot stove burner. B. Electricity was run through water to separate the hydrogen from the oxygen (Electrolysis). C. A shovel was left stuck in the mud over the winter. D. Baking soda and hot water were used to clean the corrosion off a car battery's terminals. E. A magnifying glass focused the sun's rays to their brightest point on a piece of paper. F. A bicycle chain was left out in the rain without any oil. Which items on the list would most likely burn?

8. Answer 1 – 30 A. Cooking oil was splashed on a hot stove burner.
E. A magnifying glass focused the sun's rays to their brightest point on a piece of paper.

9. Question
Terry and Jean experimented with several items to see what would happen under different conditions. Below is the data table they wrote at the conclusion of the experiment.
Which substance changed chemically under all three conditions?

10. Answer 1 – 40
Steel Wool

11. Question
The data in the table below were collected by a group of students as they tested four different types of plastics. Which of the plastics could be the same? 

12. Answer 1 – 50
1 and 4

13. Question
Give 2 examples of a physical change

14. Answer 2 – 10
Many possible answers

15. Question
Give 2 examples of a chemical change

16. Answer 2 – 20
Many possible answers

17. Question
As Jean and Terry mixed the dry ingredients with the wet ingredients while making a snack, the mixture began to bubble what type of change is occurring? Explain how you know

18. Answer 2 – 30
a gas was being produced, therefore a chemical change was taking place

19. Question
Which substances are necessary for plants to produce sugar during photosynthesis?
Must include all 3 substances.

20. Answer 2 – 40
water, carbon dioxide, chlorophyll

21. Question
What is a characteristic that all chemical changes have in common?

22. Answer 2 – 50
A new substance is formed.

23. Question
Water is placed over a burner and it boils. The graph shows the temperature at each 2-minute interval. The experiment ended at 20 minutes.
How hot was the water at 6 minutes?

24. Answer 3 – 10
40°C

25. Question
Which physical change does a swamp cooler use to cool the air?

26. Answer 3 – 20
Liquid to gas

27. Question
A container is filled with 100 mL of water and placed in a freezer. The water in the container freezes at 0oC . A second container filled with 90 mL of water is placed in a second freezer. At what temperature does this second container of water freeze?

28. Answer 3 – 30
0oC

29. Question
Water is placed over a burner and it boils. The graph above shows the temperature at each 2-minute interval. The experiment ended at 20 minutes. Using the graph above answer the following question.
If the water were left to boil for 10 minutes more, how hot would it get?

30. Answer 3 – 40
100°C

31. Question
One hot August afternoon you spill your ice water on the sidewalk, and you watch the ice quickly start to melt. Sometime later, you walk by again but there is no sign of your spill. Which drawing best shows what happened to the ice?

32. Answer 3 – 50

33. Question
Acid rain is found in parts of the country where there are many cars and power plants. Water in the form of rain is chemically combined with sulfur dioxide and oxygen to create sulfuric acid, which becomes acid rain. In the reaction above, which substances are considered the reactants?

34. Answer 4 – 50
Water, Sulfur Dioxide, Oxygen

35. Question
If four carbon atoms undergo a chemical reaction with oxygen to form CO2 molecules, how many carbon atoms will be found in the product?

36. Answer 4 – 20
four

37. Question
50 grams of vinegar and 2 grams of baking soda are mixed together. A bubbling reaction takes place. The mixture is weighed again and now weighs 49 grams. Where did the missing weight go?

38. Answer 4 – 30
Into the air as the bubbles rose to the surface and escaped.

39. Question
The following results were collected during 3 experiments that involved dissolving sugar in water.
What did experiment #1 show about dissolving sugar?

40. Answer 4 – 40
Increasing the temperature decreases the amount of time it takes to dissolve

41. Question
The Law of Conservation of Mass states that matter is not gained or lost in a chemical reaction.  What is another way of writing this law?

42. Answer 4 – 10
the amount of mass of the reactants will equal the mass of the products.

43. Question
A cube of sugar has the following properties. Check each item that indicates a chemical property.
Mass = 2 grams 
Density = 8 g/cm3
Burns when heated 
Composed of small, white crystals
Bubbles and fizzes when heated

44. Answer 5 – 10
Burns when heated
Bubbles and fizzes when heated

45. Question
What is a decomposition reaction?

46. Answer 5 – 20
When a reactant breaks down into two or more products.

47. Question
What type of reaction requires a continuous supply of energy to keep it going?

48. Answer 5 – 30
An endothermic reaction

49. Question
What are the four steps to balancing a chemical equation?

50. Answer 5 – 40 Write the equation Count the atoms
Use Coefficients to balance
Look back and check

51. Question
Balance the following equation
C3H8 + O2  CO2 + H2O

52. Answer 5 – 50
C3H8 + 5O2  3CO2 + 4H2O