Grade 9 Science Exam Review. 1. Define the following terms and give an example from something in this class. Are these qualitative or quantitative properties?

Grade 9 Science Exam Review

Grade 9 ScienceExam Review1. Define the following terms and give an example from something in this class. Are these qualitative or quantitative properties? Why?

a) lustre e) malleability b) density f) brittleness c) clarity g) viscosity d) solubility h) texture

2. Give the chemical formulas for the following substances and state how many atoms of each.

a) methanol b) potassium permanganate c) copper d) water e) acetic acid (vinegar) f) glucose g) hydrochloric acid


3. Give two reasons for why knowing the properties of a substance is useful.


4. Identify the main postulate of Particle Theory illustrated by each of the following and explain.

a) dye spreads out more in hot than in cold water.

b) 10 mL of water and 10 mL of methanol does not produce 20 mL of solution.

c) water droplets stay in nice rounded formations (ie. beads up) on a waxed car.


5. Identify each of the following as a chemical or physical change.

a) baking a cake b) bending a wire c) sweat evaporating from skin d) rocks dissolving in the ocean e) stomach acid digesting food f) wind knocking over a tree g) forest fire


6. Identify each of the following as a mechanical mixture, pure substance, or solution and indicate if it is homogeneous or heterogeneous.

a) muddy water f) salad dressing b) oreo cookie g) sodium c) tap water h) orange juice w/ pulp d) vinegar i) carbon dioxide e) chlorine gas


Grade 9 Science Exam Review7. Describe these early models of the atom.

a) Dalton b) Thomsom c) Rutherford d) Bohr

Grade 9 Science Exam Review8. What is a positive ion? What is a negative ion?

9. Categorize these as positive or negative ions and state how many particles (and which) have been lost or gained.

a) Mg2+ b) Cl- c) N3- d) K+

Grade 9 Science Exam Review10. Choose the correct formula for calcium chloride. a) CaCl b) Ca2Cl c) CaCl2

11. Choose the correct formula for aluminum fluoride. a) Al2F3 b) AlF3 c) Al3F

Grade 9 Science Exam Review12. Examine this diagram of electrolysis and explain the process. What are the 2 gases produced? Which side is each gas on? What is the test for each gas?

Grade 9 Science Exam Review13. With respect to Chemical Families:

a) Why are elements put in chemical families?

b) Name the 4 chemical families, give 2 elements in each family, and state the valence.

c) What element(s) could substitute for calcium in a chemical reaction? Why?

d) What group # on the periodic table includes Ca? Cl?

Grade 9 Science Exam Review14. Who invented the periodic table?

15. Identify trends in the periodic table.

16. On which side of the periodic table are the metals / non-metals located (give examples)?

17. Identify some solids, liquids, and gases in the periodic table. What state are MOST of the elements in?

Grade 9 Science Exam Review18. What information can you get from this symbol? 12 C 6

19. How are these atoms different? the same? 12 13 C C 6 6

Grade 9 Science Exam Review20. Dr. Doodle was interested in studying the effect of red and green light on photosynthesis. He decided to test his belief that red light is more important than green light in photosynthesis. He figured if he exposed plants to red light, they would grow better than if he exposed them to green light. He took 3-week old tomato plants and exposed half of them to green light and half of them to red light for one month. During that time he recorded their growth as a measure of photosynthesis. He eventually determined the plants grew better under red light.

Scientific Method: Variables: a) problem e) experiment a) dependent b) background reading f) observations b) independent c) hypothesis g) conclusions c) controlled d) prediction

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Grade 9 Science Exam Review. 1. Define the following terms and give an example from something in this class. Are these qualitative or quantitative properties?