R Chem: Solutions and Solubility Test

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

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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

H Chem: Ch 5 test

H Chemistry Test 2, Ch 5:
Chemical Structure and Nomenclature

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.

1. What is the difference between CuCl, and CuCl2?
a)    One compound is a chloride while the other is a chlorite
b)    One compound is ionic while the other is molecular
c)    One compound’s name requires a roman numeral while the other does not
d)    One compound has one nonmetal while the other has more than one.

2. What does the suffix ‘ate mean?
a)    All atoms in the metal position are non metals
b)    The compound is ionic
c)    The compound contains oxygen atoms
d)    All atoms in the compound are non metals
e)    All atoms in the compound are metals

3. What is the number of valence electrons for Cd?
a)    0
b)    1
c)    2
d)    3
e)    4

4. The valence energy level for Cs is energy level:
a)    4
b)    6
c)    2
d)    1
e)    5

5. How many protons are in the Zn ion?
a)    26
b)    28
c)    30
d)    32
e)    34

6. What is the name of this molecule FeS?
a)    Iron (I) Sulfite
b)    Iron (I) Sulfide
c)    Iron (II) Sulfate
d)    Iron (II) Sulfide

7. In the molecule of copper (I) sulfite, what does the (I) represent?
a)    Number of oxygen atoms in sulfite
b)    Number of molecules of copper sulfite
c)    The charge of copper ion
d)    The charge of the sulfate ion

8. Why don’t noble gases form compounds easily?
a)    Noble gases are all nonmetals
b)    Noble gases only form compounds with oxygen
c)    Noble gases have complete valence energy levels
d)    Noble gasses have complete valence charges
e)    Noble gases don’t form ionic bonds

9. This is the correct order of a Bromine atom, molecule and ion.
a)    Br2, Br-, Br
b)    Br2, Br+, Br-
c)    Br, Br-, Br2
d)    Br-, Br2, Br3
e)    Br, Br2, Br-

10. How many valence electrons does Boron have?
a)    2
b)    3
c)    4
d)    5
e)    6

11. How many electrons are in the chlorine ion?
a)    15
b)    16
c)    17
d)    18
e)    19

12. What is the difference between phosphorus trioxide and phosphorus pentoxide?
a)    the number of phosphorus atoms
b)    the number of oxygen atoms
c)    presence of a metal
d)    molecular bonding
e)    the number of trioxides

13. What is the suffix that denotes the presence of 2 distinct elements in a compound?
a)    ‘ine
b)    ‘ite
c)    ‘ide
d)    ‘gen
e)    ‘di

14. The prefix for seven atoms is:
a)    tetra
b)    hepta
c)    hexa
d)    penta
e)    septa

Use the following list to answer questions 15-17
(1)    Copper (I) Nitrite
(2)    Copper (II) Nitride
(3)    Copper (II) Nitrate
(4)    Copper (I) Dinitride
(5)    Copper (I) Nitrate

15. Which of the above contain PANs?
a)    1 and 2
b)    2 and 3
c)    4, 1 and 2
d)    2, 3 and 5
e)    none of the above choices

16. Some of the above choice(s) are/is an invalid name for a compound.  This is because:
a)    Copper compounds must have a roman numeral in their names.
b)    Prefixes are named only for molecular compounds.
c)    The suffix ‘ide represents the presence of only 2 elements.
d)    Nitrates have a charge of -1.
e)    Copper compound do not form more than one ion.
17. Which of the above contain only 2 elements?
a)    a and b
b)    c and d
c)    e
d)    b
e)    b and d

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18. What does the element’s period (location on the periodic table) describe?
a)    How much energy is available for a chemical reaction.
b)    Number of grouped electrons available for bonding.
c)    The valence energy level of the element.
d)    Number of electrons that are gained or lost when becoming an ion.
e)    None of the above choices

19. What is the structure for Potassium Sulfide?
a)    K6S
b)    KS2
c)    K2S
d)    KS6
e)    K2S2

20. What is the structure for Strontium Dihydrogen Phsophate?
a)    SrH2PO4
b)    SH2PO4
c)    SrHPO3
d)    SrH2PO3
e)    Sr2H2PO4

21. What is the name of the structure NaClO3?
a)    Sodium Chlorate
b)    Sodium Perchlorate
c)    Sodium Chlorite
d)    Sodium Perchlorite
e)    Sodium Hypochlorite

22. What is the name of the structure Li2(C2O4)?
a)    Lithium Chromate
b)    Lithium Dichromate
c)    Lithium Oxalate
d)    Lithium Dioxalate
e)    Lithium (II) Chromate

23. The following is a correct list of elements that form more than one ion?
a)    Sn, Fe, Co
b)    C, Cr, Si
c)    Mg, Mn, Hg
d)    V, Cr. Mn
e)    Pb, Bi, Co

Use the following answer choices for question #24-26.
a)    1
b)    2
c)    3
d)    4
e)    6

24. How many atoms of hydrogen are in 2Ni(HCO3)2?

25. What is the total number of atoms in calcium carbide?

26. How many oxygen atoms are in dinitrogen tetroxide?

Use the following answer choices for question #27-30.
a)    0
b)    +1
c)    +2
d)    -2
e)    -1

27. What is the charge of the acetate ion?

28. What is the charge of the metal in Mg(C2H3O2)2?

29. What is the charge of hydrogen in CaHPO4?

30. What is the charge of the iron ion in Fe(OH)2?

31. What is the charge of the oxygen molecule?

*********

32. When writing the correct name of HgF2, what correct additional information is needed?
a)    prefix
b)    suffix
c)    roman numeral
d)    subscripts
e)    None of the above

33. What is the name of the structure SO3?
a)    Monosulfur Trioxide
b)    Sulfate
c)    Sulfite
d)    Trisulfur Oxide
e)    Sulfur Trioxide

34. The name of a type of fertilizer, NH4NO3, is ammonium nitrate.
a)    True
b)    False

35. The compound SF6 is a type of:
a)    binary molecular compound
b)    binary ionic compound
c)    ternary acid
d)    ternary ionic compound
e)    binary acid

(end of test)

R Chem: Agenda 10/20/06 Friday

Agenda 10/20/06 Friday

No preamble

Open Notebook Quiz
Turn in Notebook for RTN checks

HW: CO2 Lab due Tues
Expert element periodic chart due next Friday

R Chem: Agenda 10/20/06 Friday

Agenda 10/20/06 Friday

No preamble

Open Notebook Quiz
Turn in Notebook for RTN checks

HW: CO2 Lab due Tues
Expert element periodic chart due next Friday

R Chem: Agenda 10/20/06 Friday

Agenda 10/20/06 Friday

No preamble

Open Notebook Quiz
Turn in Notebook for RTN checks

HW: CO2 Lab due Tues
Expert element periodic chart due next Friday