Which of the following elements is considered a metal? Sulfur Chalone Phosphorou

Question

Which of the following elements is considered a metal? Sulfur Chalone Phosphorous Magnesium Nitrogen Which ionic compound listed below does not have a correct formula? SrSO_4 Al(NO_2)_3 Ba(OH)_2 CaPO_1 K_2 O Which of the following group of elements are considered representative elements or Main Group Elements? Alkali metals Alkaline Earth metals Halogens Noble Gas All of the above What is the ratio of a/b where a, b, c, and d represent the coefficients in the balanced equation? aZn + bH_3 PO_4 rightarrow cH_2 + dZn_y (PO_4)_2 3/1 3/2 6/3 6/4 none of these How many moles are present in 5.00 grams of CO_2? 8.31 times 10^24 moles of CO_2 0.114 moles of CO_2 220 moles of CO_2 6.84 times 10^22 moles of CO_2 3.01 times 10^24 moles of CO_2 Consider the following reaction: CO(g) + O_2 (g) rightarrow CO_2 (g) How many grams of O_2 are required to react completely with 25.0 grams of CO? 7.14 g O_2 12.5 g O_2 14.3 g O_2 28.6 g O_2 43.8 g O_2 How many molecules are in 29 g of CH_4? 1.1 times 10^23 molecules 3.3 times 10^23 molecules 1.1 times 10^24 molecules 3.3 times 10^24 molecules none of these

Explanation / Answer

(8) (d) Magnesium

(9) (d) Ca2+ + PO43- -------------> Ca3(PO4)2

(10) (e)

(11) (b) 3/2

3 Zn + 2 H3PO4 -----------> 3 H2 + Zn3(PO4)2

(12) (b)

Number of moles = mass / molar mass = 5.00 / 44.0 =0.114 mol

(13) (c)

2 CO + O2 -----------> 2 CO2

2 mol CO = 1 mol O2

56 g. CO = 32 g. O2

Then, 25 g. of CO = 25 * 32 / 56 = 14.3 g. of CO2

(14) (c)

1 mol (16 g. ) of CH4 = 6.022 * 1023 molecules

then, 29 g. of CH4 = 29 * 6.022 * 1023 / 16 = 1.09 * 1024 molecules of CH4 are present

(15) (b)

Ba(NO3)2 (aq.) + Na2SO4 (aq.) ------------> BaSO4 (s) + 2 NaNO3 (aq.)

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