Question

Please answer all multiple choice

Questions 1-20 are multiple choice questions. Please mark the correct circle on the Scantron form. Only the Scantron form will be graded. Scantron must be filled in before time is called Which of the following acids is not a strong acid? 5 HI b. HBr to SEHNO, HF HESO. Venter 2. Which of the following is an example of an empirical formula: a Cs Ho HO LP Fea(SO) d) P06 Fe (PO) 3. A reaction in which a substance reacts with oxygen to produce a release carbon dioxide and water: * Combination Reaction Combustion Reaction Decomposition Reaction di Displacement Reaction Precipitation Reaction 4. 25.00 mL of a 0.135 M solution of KMnO4 is diluted to 175 mL. What is the new molarity of the solution? Miv, M, V2 a. 0.0324 M b. 0.945 M c. 32400 M dh0.193 M e 0.0193 M (0.135) (25.00/= M₂ (175) 5. Magnesium nitrate is a strong electrolyte. Determine the concentration of magnesium ion when a 1.25 M solution of magnesium nitrate is made. a. 2.50 M 24.3 b. 0.625 M c. 1.25 M d. 12.5 M e. None of the above

All questions need to be answered!

Answer 1

1) HF is not a strong acid

2) Fe3(PO4)2

3) Combustion reaction

4) 25 * 0.135 / 175 = 0.0193

5) Mg(NO3)2 ---> Mg2+ + 2NO3 -

[Mg(NO3)2] = [Mg2+] = 1.25 M

6) V = 3.75 * 150 / 12 = 46.9 ml

7) Neutralization reaction

8) net ionic;

CO3 2-(aq) + Co2+(aq) ----> CoCO3(s)

9) Most sulfates are soluble.

10) FePO4

11) Ni(s) is reducing agent

12) moles of KCl = 2/74.5 = 0.0268

Molarity = 0.0268/0.250 = 0.107 M

13) Gives relatively small percentage of ions when dissolves in water

14) Oxygen is balanced by adding H2O to one side

15) Spectator ions

16) increases with increase in temperature

17) H2SO4 + 2CsOH ---> Cs2SO4 + 2H2O

6 oxygen

18) % of C = 12*100/28 = 42.8%

19) Limiting reactant

20) Moles of O2 = 2.8/32 = 0.0875

Balanced chemical reaction;

2H2 + O2 ----> 2H2O

From reaction;

1 mole O2 produces 2 mole H2O

So, 0.0875 mole O2 will produce = 2 * 0.0875 = 0.175 mole of H2O

Mass of H2O = 0.175 * 18 = 3.15 g

% yield = 2.4*100/3.15 = 76.2 %