Module 2: Introduction to Quantitative Chemistry Practice Questions for Year 11 Chemistry

Mole Concept

Question 6

设计一个旨在获得镁的摩尔质量的实验。（6分）

（L2.1：进行实际研究以证明和计算摩尔质量（一摩尔的质量）an element,化合物）

Question 7

0.42mg CO的样品2gas was found to occupy 3.65L of volume. Explain how the “Ideal Gas Law” can be used to obtain the molar mass of CO2。计算CO的摩尔质量2。（4分）

（L2.1：进行实际研究以证明和计算摩尔质量（一摩尔的质量）an element,化合物）

Question 8

设计实验，测试以下反应是否在简单的整数比率上进行。（6分）

(L2.2: conduct an investigation to determine that chemicals react in simple whole number ratios by moles)

Question 9

Answer the following questions: (6 marks)

(L2.3: explore the concept of the mole and relate this to Avogadro’s constant to describe, calculate and操纵肿块，化学量和粒子数量:元素和化合物的痣？=？/ mm（n =摩尔中的化学量，m =克质量，β/ m = GMOL-1中的摩尔质量）

问题10.

聚合物是由多次重复的简单单元组成的大分子。因此，它们通常具有相对简单的经验公式。计算以下聚合物的经验公式。（5分）

a) Lucite (Plexiglas); 59.9% C, 8.06% H, 32.0% O

b) Saran; 24.8% C, 2.0% H, 73.1% Cl

c) polyethylene; 86% C, 14% H

d）聚苯乙烯;92.3％c，7.7％h

e) Orlon; 67.9% C, 5.70% H, 26.4% N

来自化学库格雷文化的问题

（L2.3：探索痣的概念，并将其与Avogadro的常数相关联，以描述，计算和计算操纵肿块，化学量和粒子数量percentage composition calculations and empirical formulae)

问题11.

当通过以下反应通过氧转化为乙酸乙醇转化为乙酸时，会发生葡萄酒：

1.00 L瓶葡萄酒，标记为8.5％（体积）乙醇，密封有缺陷。分析1.00毫升显示，在1.00毫升中有0.0274克乙酸。乙醇的密度为0.816g / ml，水密度为1.00克/ ml。

a) What mass of oxygen must have leaked into the bottle? (3 marks)

b) What is the percent yield for the conversion of ethanol to acetic acid if O2 is in excess? (4 marks)

Question sourced from Washington University in St. Louis Department of Chemistry

(L2.3: explore the concept of the mole and relate this to Avogadro’s constant to describe, calculate and操纵肿块，化学量和粒子数量限制试剂反应）

Concentration and Molarity

问题12.

Explain how you have used gravimetric analysis to find the concentration of an unknown solution. (3 marks)

(L3.1: conduct practical investigations to determine the concentrations of solutions and investigate the different ways in which concentrations are measured)

问题13.

在重量分析过程中，发现实验值小于溶液的理论浓度。解释三个错误来源，并建议妨碍它们的方法（3分）。

(L3.1: conduct practical investigations to determine the concentrations of solutions and investigate the different ways in which concentrations are measured)

问题14.

Calculate the concentration (in mol/L) of the following (6 marks):

问题15.

通过将100.0ml 2.0m KCl与50.0ml 1.50m CaCl混合制备的溶液中氯离子的摩尔浓度是多少。₂解决方案？（5分）

（L3.2：操纵变量并解决问题以计算浓度，质量或数量? = ?/? (molarity formula),稀释液（稀释前的摩尔数=稀释后样品的摩尔数）））））

问题16.

描述如何做一个标准的解决方案0.1M hydrochloric acid and dilute it to 0.02M. Include relevant calculations and safety precautions. (7 marks)

(L3.3: conduct an investigation to make a standard solution and perform a dilution)

天然气法律

Question 17

A student hypothesized that N2gas in the balloon would deflate upon increased temperature. Will his hypothesis be proven correct or wrong? Explain your answer with reference to Gay-Lussac’s Law and the Ideal Gas Law (4 marks).

(L4.1: conduct investigations and solve problems to determine the relationship between the Ideal Gas Law andGay-Lussac’s Law (temperature)

Question 18

With reference to Boyle’s law, explain the effect of increasing pressure on the volume of a known gas with a constant mass and temperature. How is this represented in the Ideal Gas Law equation? (4 marks)

(L4.1: conduct investigations and solve problems to determine the relationship between the Ideal Gas Law andBoyle’s Law)

Question 19

Using the Charles Law, explain the effect of increasing temperature on the molecular characteristics of gases. How is this represented in the Ideal Gas Law equation? (3 marks).

(L4.1: conduct investigations and solve problems to determine the relationship between the Ideal Gas Law and查尔斯法律）

Question 20

During an experiment, a student has found that the volume and amount of moles of O2气体彼此并不成比例。使用Avogadro的法律，解释任何错误来源，并建议避开它们的方法（4分）。

（L4.1：进行调查并解决问题，以确定理想气体法与A之间的关系Vogadro的法律）