السلام عليكم
عندي كتلة اسئلة تلخبطت في حلها وكمان ماعرفت كيف انحلت وبرضوه بعضها ماعرفت احلها ........ بليز هيلب مي 
What are the ions present in the compound (NH4)2SO4 ?
} NH3, H2, and SO2
} N3–, H+, S2–, O2–
} NH42+ and SO4–
} NH4+ and SO42– (3 IONS)
} (NH4+)2 and SO42–
If the pressure of a gas sample is quadrupled and the absolute temperature is
doubled, by what factor does the volume of the sample change ?
A. 8 B. 2 C. 1 /2 D 1 /4 E. 1 /8
Which of the following solutions has the lowest pH at 25oC? (No calculations required.)
•(a) 0.2 M NaOH
•(b) 0.2 M NH3
•(c) 0.2 M HCl
(d) pure water
What is the [H+]ion in a 4.8 × 10-2 M KOH solution?
4.8 × 10-2 M
1.0 × 10-7 M
4.8 × 10-11 M
4.8 × 10-12 M
2.1 × 10-13 M
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Calculate the [OH-] ions in a 1.3 M HCl.
10−14´Kw = [H3O+][OH−]= 1.0
10−14/´[OH−] = 1.0 [H3O+]
10−14/ 1.3´[OH−] = 1.0
10−15´[OH−] = 7.7 M
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2. What is the concentration of H+ in a 2.5 M HCl solution?
A. 0
B. 1.3 M
C. 2.5 M
D. 5.0 M
E. 10 .M
اللي بالارونج ليه كذا صاروا كل واحد طريقة اجابتهغير ؟
What is the [OH-] ion in a 5.2 × 10-4 M HNO3 solution?
1.9 × 10-11 M
1.0 × 10-7 M
5.2 × 10-4 M
zero
1.0 × 10-4 M
اش هو الحل ؟
6. For the following reaction at equilibrium, which choice gives a change that will shift the position of equilibrium to favor formation of more products?
2NOBr(g) 2NO(g) + Br2(g),
A. Increase the total pressure by decreasing the volume.
B. Add more NO.
C. Remove Br2.
D. Lower the temperature.
7. For the following reaction at equilibrium in a reaction vessel, which one of these changes would cause the Br2 concentration to decrease?
2NOBr(g) 2NO(g) + Br2(g),
A. Increase the temperature.
B. Remove some NO.
C. Add more NOBr.
D. Compress the gas mixture into a smaller volume.
8. For the reaction at equilibrium 2SO3 2SO2 + O2 (DHºrxn= 198 kJ/mol), if we increase the reaction temperature, the equilibrium will
A. shift to the right.
B. shift to the left.
C. not shift.
D. The question cannot be answered because the equilibrium constant is not given.
9. For the equilibrium reaction 2SO2(g) + O2(g) 2SO3(g), DHºrxn = -198 kJ/mol. Which one of these factors would cause the equilibrium constant to increase?
A. Decrease the temperature.
B. Add SO2 gas.
C. Remove O2 gas.
D. Add a catalyst.
E. none of these
10. The reaction 2SO3(g) 2SO2(g) + O2(g) is endothermic. If the temperature is increased,
A. more SO3 will be produced.
B. Kc will decrease.
C. no change will occur in Kc .
D. Kc will increase.
E. the pressure will decrease