بعض أسئلة لدوري 1 صيفي 1431هـ
B1) Which of the following is not a SI bae unit?
a- Kilometer b- second c- mole d- Kelvin
B2) Express 850 nm as picometer:
a- 8.5 pm b- 8.5 x 103 pm c- 8.5 x 10-3 pm d- 850 pm
B3) Which of these quantities represents the smallest mass?
a- 5.0 x 102 mg b- 0.0010 kg c- 3.0 x 10 ug d- 2.0 x 102 cg
B4) Hom many liters is 0.0370 mL?
a- 3.7 x 10-5 L b- 370 L c- 3.7 x 105 L d- 3.70 L
B5) A 80 mL sample of 0.436 M NaNO3 is diluted with water to a total volume of
250.0 mL. What is the sodium nitrate concentration in the resulting solution?
a- 1.4 x 10-2 M b- 0.14 M c- 1.4 M d- 14.0 M
B6) A lithium ion, Li+, has (p = protons and e = electrons)
a- 7 p and 3 e b- 2 p and 3 e c- 3 p and 7 e d- 3 p and 2 e
B7 Which pair of the following compounds has the same empirical formula?
a- C2H6O3/CH2O b- C6H12O6/CH2O c- C2H5 d- C5H5N/CH5N
B8 Zinc dissolves in hydrochloric acid to yield hydrogen gas:
Zn(s) + 2HCl(aq) ZnCl2(s) + H2(g)
What mass of hydrogen gas is produced when a 8.50 g of zinc dissolves in
250mL of 4 M HCl?
a- 0.262 g b- 26.2 g c- 0.130 g d- 1.30 g
B9 Which of the following samples contains the smallest number of lead atoms?
a- 100 g of Pb b- 0.5 mole of PbO
c- 2.0 mole of PbCO3 d- 0.1 mole Pb3(PO4)2
B10For the reaction:
2 PbS(s) + 3O2(g) 2PbO (s) + 2 SO2 (g)
If 20 mole of PbS reacts with excess oxygen, how many moles of SO2 will
produced?
a- 20 b- 5.0 c- 10 d- 15
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