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R Chem: Solutions and Solubility Test

Posted by msjullyyi on October 21, 2006

R Chemistry Test 2:
Solutions and solubility

Directions: Please select the correct answer choice from the following questions. Be sure to darkly bubble in your scantron with a number 2 pencil. Be sure to put your name, date, period and class on your scantron.

Bubble in (a) true or (b) false for your answer choices.

1. Suspensions mixtures contain the largest solute particles.
2. A heterogeneous mixture’s composition varies.
3. All colloids are solutions.
4. A mixture is when two or more substances combine, yet retain their individual properties.
5. When a light beam shines through a solution, the beam’s path can be clearly seen in the liquid.
6. A regular balloon shrink much more slowly that do metallic ones.
7. When fizzing stops, the soda is now unsaturated with the dissolved carbon dioxide.
8. All solutions are homogeneous mixtures.
9. The solubility of a solid increases with increasing temperature.
10. The tyndall effect is a tool to help determine between a suspension and a colloid.

Use the following reaction to answer to questions 11-14.

4Al + O2 → 3Al¬2O¬3

a) 1
b) 2
c) 3
d) 4
e) 6

11. Do an atom inventory. How many atoms of aluminum are on the product side?

12. How many molecules of oxygen are on the reactant side?

13. How many TOTAL atoms are on the reactant side?

14. Is this reaction balanced?
a) Yes
b) No

************

15. What is the x axis for a solubility chart?
a) Grams of solvent per 100 grams of water
b) Grams of solute per 100 grams of water
c) Temperature of the solute
d) Temperature of the solvent

16. How do we know when a reaction is balanced?
a) Coefficients on reactant side and the product side are whole numbers.
b) The number of atoms on both sides of the reaction are equal.
c) Atoms on the reactant side are all positive, not negative.
d) Atoms on the product side are all positive, not negative.

17. What is the “glue” that holds atoms together?
a) chemical bonds
b) chemical links
c) bonding atoms
d) chemical atoms
e) chemical glue

Based on this Solubility Charge answer questions 18-21.

(solubility curve image here)

a) Saturated
b) Supersaturated
c) Unsaturated

18. At 20 degrees Celsius, 30 grams of NaCl in 100 grams of water is:

19. At 40 degrees Celsius, 50 grams of KNO3 in 100 grams of water is:

***********

20. A heterogeneous mixture is uniform throughout.
a) True
b) False

21. All suspensions are heterogeneous.
c) True
d) False

22. Homogeneous solutions will not display the beam of light caused by the Tyndall effect.
a) True
b) False

23. What do we call the compounds on the left side of a chemical equation?
a) material
b) ingredients
c) reactants
d) products
e) none of the above

24. If individual elements are like the letters of an alphabet, chemical formulas are like:
a) paragraphs
b) words
c) sentences
d) capital letters
e) punctuation

25. The subscript of an element in a compound describes:
a) The number of molecules
b) The total number of atoms in a molecule
c) The number of atoms that make up a molecule
d) The number of reactants
e) The total number of molecules on the reactant side

26. The trend for the slope of the solubility of gases in liquid is:
a) The same as that of solids.
b) The same as that of liquids.
c) The reverse as that of solids.
d) The reverse as that of liquids.
e) The reverse as that of gases.

27. In a mixture of NaCl (sodium chloride, table salt) in water:
a) The solute is the water
b) The solvent is the water
c) The solute is the chloride
d) The solute is the sodium metal
e) The solvent is the solution

28. A large number in front of a molecule, the coefficient indicates:
a) the number of electrons in a molecule
b) the number of molecule units
c) the number of atoms in a molecule
d) the number of charges in the molecule
e) the number of atom units

29. An example of a colloid is:
a) koolaid
b) jello
c) milk
d) dirty water
e) engine oil

30. A mixture can be both a suspension and a colloid.
a) True
b) False

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