Download Practice Toxins Mid-Unit Test 08-09

Practice Toxins Mid-Unit Test 08-09
______1. What type of reaction is this? Ag (s) + CuI2 (aq)  AgI (s) + Cu(s)
(A) single displacement
(B) double displacement
(C) combination reaction
(D) decomposition reaction
______2.Calcium Chloride is abbreviated
(A) CaCl
(C) Ca2Cl
(B) CaCl2
(D) Cl2Ca
______3. What is the molarity of 3.5 moles of NaCl in 5.0 liters of water?
(A) 1.43 M
(B) 0.7 M
(C) 0.7 moles (D) 17.5 M
______4. Carbon Dioxide is abbreviated
(A) CO
(B) C2O
(C) CO2
(D) O2C
______5. NaNO3 is
(A) Sodium Nitrate
(B) Sodium Nitrogen
(C) Sodium Nitrogen Oxide
(D) Sodium Nitrogen Trioxide
______6. The correct chemical formula for potassium carbonate is
(A) P2CO3
(B) P(CO3)2
(C) K2CO3
(D) K(CO3)2
______7. NF3 is
(A) Nitrogen Fluoride
(B) Nitrogen Tetrafluoride
(C) Nitrogen Trifluoride
(D) Nitrogen Fluorine
______8. Which substance is the least toxic?
(A) chlorine (LD50 = 850 mg/kg)
(B) aspirin (LD50 = 200 mg/kg)
(C) cola (LD50 = 140 mg/kg)
(D) vitamin A (LD50 = 2000 mg/kg)
_______9. Which statement is not true?
(A) A mole equals 6.02x1023 atoms
(B) A mole of substance has a specific mass.
(C) Two moles equals 1.204x1024 atoms (D) A mole of any substance has the same mass.
______10. How many moles of potassium iodide, KI, are there in 100 grams?
(A) 0.6 moles
(B) 1660 moles (C) 3.01 x 1025 moles
(D) 5.0 x 10–24 moles
______11. Which is true of a solute?
(A) It contains a dissolved substance.
(C) It donates electrons.
(B) It is the substance present in the lesser amount.
(D) It must be water.
______12. In order to balance a chemical equation, you can change
(A) the subscripts
(B) the chemical formulas
(C) the reactants and the products
(D) the coefficients
______13. How many grams of sugar (LD50 = 30 g/kg) would be lethal to a 175-pound man (2.2 lbs =
1kg)?
(A) 0.13 g
(B) 2.65 g
(C) 11550 g
(D) 2386 g
______ 14. Calculate the molar mass of ammonium phosphate, (NH4)2CO3.
(A) 96.0 g/mole
(B) 113.0 g/mole
(C) 242.0 g/mole
(D) 121.0 g/mole
______ 15. What would you expect to see if you performed the following chemical reaction?
2 H2O2 (aq)  H2O (l) + O2 (g)
Living By Chemistry Assessments
© 2004 Key Curriculum Press
Toxins Unit
Preliminary Edition
(A) bubbles forming in a liquid (B) just a liquid
(C) solid forming in a liquid
(D) only solid forming
______ 16. CO2 (s)  CO2 (g) is an example of
(A) a chemical change
(C) a combination reaction
(B) a physical change
(D) a decomposition reaction
______ 17. What is the correct description of this reaction?
Zn (s) + HCl (aq)  ZnCl2 (aq) + H2 (g)
(A)
Hydrogen gas reacts with a solution of zinc chloride to produce solid zinc metal
in a solution of hydrochloric acid.
(B) A solution of zinc metal reacts with solid hydrochloric acid to produce a solution of
zinc chloride and hydrogen gas.
(C)
Hydrogen gas reacts with solid zinc chloride to produce solid zinc metal in a
solution of hydrochloric acid.
(D)
Solid zinc reacts with a solution of hydrochloric acid to produce a solution of
zinc chloride and hydrogen gas.
______ 18. When the equation Fe2O3 + H2  Fe + H2O is balanced, Fe has a coefficient of
(A) 6
(B) 3
(C) 2
(D) 1
______ 19. What type of reaction is this: AgNO3 (aq) + Cu (s)  Ag (s) + Cu(NO3)2 (aq)?
(A) single displacement (B) double displacement (C) combination
(D) decomposition
______20. Balance the following equation. What will the coefficient be for Silver Nitrate?
AgNO3 (aq) + Cu (s)  Ag (s) + Cu(NO3)2 (aq)
(A) 1
(B) 2
(C) 3
(D) 4
Short Answer:
21. How many grams are in 5.5 moles of CaCl2? Show your calculations.
22. Balance this chemical equation.
C3H8 (g) + O2 (g)  CO2(g) + H2O (l)
23. Which salt, NaCl, solution is more concentrated? Solution A contains 2.5 moles of NaCl in 100mL
of water. Solution B contains 5.0 moles of NaCl in 500mL. Prove you answer.
24. How many atoms are in 34.5 grams of silver, Ag? Show your calculations.
25. How many grams of KCl are in 1.5 liters of a 4.5M solution? Show your calculations.
Answers:
1 a 8d
2. b
9d
3 b
10 a
4. c
11 b
5. a 12 d
6 c 13 d
7 c 14 a
15 a
16 b
17 d
18 c
19 a
20 b
21. 5.5 moles x 110.98g/ 1mole = 610 grams of CaCl2
22. C3H8 (g) + 5O2 (g)  3CO2(g) + 4H2O (l)
Living By Chemistry Assessments
© 2004 Key Curriculum Press
Toxins Unit
Preliminary Edition
23. Solution A: 2.5 moles/0.1L = 25M and Solution B: 5.0moles/0.5L= 10M, so
Solution A is more concentrated.
24. 34.5 grams x 1mole/108.87g x 6.02x1023 atoms/1 mole = 1.91 x 1023 atoms of Ag
25. M= moles/L, 4.5M = ? mole/1.5L, 6.75 moles
6.75 moles x 74.55g/1 mole = 503 grams of KCl
Living By Chemistry Assessments
© 2004 Key Curriculum Press
Toxins Unit
Preliminary Edition