Consider the two beakers labeled A and B. Beaker A contains 1 mole of atoms, and

Question

Consider the two beakers labeled A and B. Beaker A contains 1 mole of atoms, and Beaker B contains 1 mole of lead atoms. Which statement concerning these samples is correct?_______________ Beakers A and B contain an equal number of atoms. Beakers A and B contain equal masses of atoms. Beakers A and B contain samples with the same density. Beakers A and B contain an equal volume of atoms. None of these are correct. The chemical equation below is unbalanced. What is the coefficient of water when the equation is balanced? Mg(OH)_2(s) + HCl(g) rightarrow MgCl_2(s) + H_2O(l) _______________ 2 1 3 4 No coefficient would be shown. Aluminum metal and oxygen gas are produced when aluminum oxide is heated at high temperature. AlO_3(s) rightarrow Al(s) + O_2(g). Which statement concerning this chemical change is true? _______________ aluminum and oxygen are the reactants in this reaction This reaction is a combination reaction. Aluminum oxide is the product in this reaction. This reaction is a combustion reaction. This reaction is a decomposition reaction. Consider the chemical equation shown below. How many moles of oxygen gas are needed to IV react with hydrogen to form one mole of water? 2H_2(g) + O_2(g) rightarrow 2H_2O(l) _______________ 5 mol 0.5 mol 4mol 1 mol 3 mol Glucose (C_6H_12O_6) is an important energy-rich compound produced by photosynthesis according to the equation below. What mass of glucose can be produced from 2.61 mol of CO_2 and the necessary water? [Molar masses of Glucose is 180. g/mol) 6CO_2(g) + 6H2_O(l) rightarrow C_6H_12O_6 + 6O_2(g) _______________ 0.0869 g 78.3 g 414g 69.0g 0.0128 g Upon mixing a clear colorless NaCl solution with a clear, colorless AgNO_3 solution according to the reaction below, a student observes a white cloudiness form. What is responsible for the cloudiness that is observed? NaCl(aq) + AgNO_3(aq) rightarrow AgCl(s) + NaNO_3(aq) _______________ NaCl AgCl NaNO_3 AgNO_3 It is impossible to tell

Explanation / Answer

(8)

(A) Both the beakers have same number of atoms. Because one mol of any species can have 6.022 * 1023 particles.

(9) (A) 2

Mg(OH)2 + 2 HCl -------------> MgCl2 + 2 H2O

(10) (E) The reaction is decomposition reaction.

(11) (B)

2 H2 (g) + O2 (g) ----------> 2 H2O (l)

From the above balanced equation,

1 mol of O2 can from 2 mol of H2O

then,

1 mol of H2O can be formed from 0.5 mol of O2

(12) (B)

From the balanced equation provided,

6 mol of CO2 can form 180 g. of glucose

then, 2.61 mol of CO2 can form 180 * 2.61 / 6 = 78.3 g. of glucose.

(13) (B) AgCl

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