题库网 (tiku.one)

 找回密码
 立即注册

 

      

上传图片附件

未使用图片

小贴士: 允许的图片文件格式为: gif, jpg, jpeg, png, webp,上传完成后会在上方生成预览,用鼠标连续双击缩略图,或拖动缩略图,该图片就被绑定至本题,显示在题目下方

本次作答已使用

小贴士: 此栏目显示的是当前作答使用的所有图片,绑定到某一题目的图片同时会显示在该题目下方; 删除使用的图片会将其转移到<未使用图片>类别


习题练习:What Drives Chemical Reactions D.1 Measuring Enthalpy Changes



 作者: admin   总分: 20分  得分: _____________

答题人: 匿名未登录  开始时间: 23年07月18日 19:19  切换到: 整卷模式

标记此题
1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which row represents the enthalpy change g lhojbb)d 5 pby-a,r,j+,v.ffor condensation and sublimation phase coyl+g.bfjh,a b v,- ,jpd rb)5hanges?

参考答案:     查看本题详细解析

标记此题
2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following is true in exottvk)u4hs. jd*d 2yf 7fhermic reactions?

参考答案:     查看本题详细解析

标记此题
3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following is correct in an end ulj/ti c8j9-aothermic reaction?

参考答案:     查看本题详细解析

标记此题
4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a reaction is endothermi h.p/aqoquh53 c:

参考答案:     查看本题详细解析

标记此题
5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which statement is true for an endothermic reaction that results in an increase in entropy?

参考答案:     查看本题详细解析

标记此题
6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The enthalpy diagram belowj2wxz u*u )nk c qr.:jsp84yy/ shows that:


参考答案:     查看本题详细解析

标记此题
7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A block of nickel of 3nwmm /lt b)+n ka4he(*u:dfw mass m=70g whose initial temperature $T_1$=18.70$^{\circ}C$, absorbs 350J of heat. Given that the specific heat capacity of Ni is approximately 0.50Jg$^{-1}$K$^{-1}$ calculate the final temperature of the block $T_f$, in $^{\circ}C$.

参考答案:     查看本题详细解析

标记此题
8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The following diagram shows the enthalpy of the reactants and products of a rkn fhks lmqd2f6,,d(r8sp+7w eaction involving gaseous covalent compounds.,spdl2+(7hf dkwq6n s 8 rk,mf Which statement is correct?


参考答案:     查看本题详细解析

标记此题
9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When a small amount 2ixu fh :8*qnwof solid sodium hydroxide is added to a sample of dilute hydrochl8h2x:w * ufiqnoric acid, an exothermic reaction takes place.
The following graph shows the temperature of the acid during the reaction. The cooling of the solution after the initial reaction follows an approximately linear trend, as indicated by the dotted line.

What value for the temperature change, ΔT, should be used to calculate the change in energy, q, during the reaction? q=mcΔT

参考答案:     查看本题详细解析

标记此题
10#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A given mass of magnesium was added to 50q*,1 .gjvqqr iki o.c)0cm$^3$ of aqueous hydrochloric acid in a Styrofoam cup to form magnesium chloride. The temperature at the start was 18$^{\circ}C$ and after the magnesium had dissolved, the temperature rose to 20$^{\circ}C$
1.State a balanced chemical equation for this reaction. Mg+  HCl → MgCl$_2$ + $H_2$
2.Given that the change in enthalpy, ΔH is0.185kJ and the specific heat capacity of water is 4.18Jg$^{-1}$K$^{-1}$, calculate the mass of magnesium added to the hydrochloric acid. m=   g.
3.Determine the systematic errors caused by the use of styrofoam cups.

参考答案:     查看本题详细解析

标记此题
11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the four reactions below isg o6i)hiue8e1 an endothermic reaction?

参考答案:     查看本题详细解析

标记此题
12#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When a 2.80g of anhydrous coppwg jo/g/5p74vs/qj 6) nel rx:;vxibter sulfate sample, $CuSO_4$ was added to 20.0g of water in a calorimeter, a rise in temperature of 15.0$^{\circ}C$ was recorded.
Given that the specific heat capacity of water is 4.18J$g^{-1}K^{-1}$;
1.Define specific heat capacity.
2.Calculate the change in enthalpy in kJ. q=  kJ.
3.Calculate the number of moles of copper Sulfate. n($CuSO_4$)=  mol.
4.Calculate the molar enthalpy of reaction.ΔH= -  kJ\mol$^{-1}$

参考答案:     查看本题详细解析

标记此题
13#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The temperature of dilute sulphuric o0 gomr:x2gb 4acid rises when it reacts with zinc according to the following chemical equatioo g:gmo40xrb2 n:

1.State whether the reaction is   .
2.Explain what this implies in terms of the chemical potential energy contained in the reactants and the products.
3.Draw an energy level diagram for this reaction.

参考答案:     查看本题详细解析

标记此题
14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which reaction below is emglxvxb horqoof)2 (z3fvj*(7; 1.i rndothermic?

参考答案:     查看本题详细解析

标记此题
15#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When a sample of solid calci3qoec enf( 9x 8+cj(u 5fc:coiituo-d61sdl6um carbonate is placed in hydrochloric acid, the following r96cfc( ex:d iclje q1od5o o8nut3s6fc(ui + -eaction takes place.
$CaCO_3$(s)+2HCl(aq)→$CaCl_2$(aq)+$H_2O$(l)+$CO_2$
The temperature and mass of the solution are both monitored, as shown.

1.The standard enthalpies of formation of hydrochloric acid and the products of its reaction with calcium carbonate are shown.


.1.Define the term standard enthalpy of formation.
.2.Calculate the standard enthalpy of formation of calcium carbonate, in kJmol$^{-1}$.
2.A reaction profile shows how the enthalpies of the molecules in a reactant change as the reaction progresses.
Part of the reaction profile for the reaction of calcium carbonate and hydrochloric acid is shown.


Complete the reaction profile by showing how the enthalpy changes between the reactants and products and labelling the value of Δ$H_r^Θ$.

3.The sample of calcium carbonate is added to 100 cm$^3$ of dilute hydrochloric acid. During the reaction, the mass of the conical flask and its contents decreases by 6.28g due to the loss of carbon dioxide gas. The molar mass of carbon dioxide is 44.0g mol$^{-1}$.

.1.Calculate, to 1 decimal place, the maximum possible change in the temperature of the solution, using sections 1 and 2 of the data booklet. You should assume that the solution has the same density and specific heat capacity as water and does not change in mass during the reaction.ΔT=(+)  ( $^{\circ}C$ ).

.2.The measured change in temperature is much less than the maximum possible value. State why the experimental and theoretical results are different, assuming that the value of Δ$H_r^Θ$, is accurate.
.3.Suggest why the measured mass loss during the reaction is likely to be less than the mass of carbon dioxide produced.

参考答案:     查看本题详细解析

标记此题
16#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In the presence of a catalyst, aqueous hydrogen s7* g(kjzh km1hm3u8g 2mnm4lperoxide decomposes into water and oxygen. The equation for this reaction and the 2l74mkg1un m*k(hmg3m s j8 zhenthalpy change
ΔH$_{dec}^{θ}$ is related to three other enthalpy changes,ΔH$_{A}^{θ}$,ΔH$_{B}^{θ}$ and ΔH$_{C}^{θ}$.

.1.State the name given to the enthalpy change labelled ΔH$_{A}^{θ}$.The name is    (of aqueous hydrogen peroxide)

.2.Calculate ΔH$_{A}^{θ}$ in kJ mol$^{-1}$ using the information in the enthalpy cycle and section 12 (Section 13- 2025 Syllabus) of the data booklet.ΔH$_{A}^{θ}$=  kJ mol$^{-1}$.

2.A solid catalyst was added to 100 cm$^{-1}$ of an aqueous hydrogen peroxide solution and the temperature was monitored using a thermometer. The resulting temperature-time graph is shown.




The maximum theoretical temperature change during the reaction, ΔT, is determined by the molar concentration of hydrogen peroxide,[$H_2O_2$]
.1.State why ΔT is determined by extrapolating the trend of the temperature profile between 65 and 120 s.
.2.Using the value of ΔH$_{dec}^{θ}$ the information in the temperature-time graph and sections 1 and 2 of the data booklet, calculate the initial concentration of the hydrogen peroxide solution in mold\m$^{-3}$.
Assume that the specific heat capacity of the solution is 4.18J g$^{-1}$K$^{-1}$. [$H_2O_2$] =  mold\m$^{-3}$.
3.The decomposition of gaseous hydrogen peroxide into water vapour and oxygen is an important atmospheric reaction.
.1.Calculate the enthalpy change of this reaction, using the bond enthalpy values in section 11 (Section 12- 2025 Syllabus) of the data booklet.
Enthalpy change=-  (kJmol$^{-1}$)
.2.Suggest one reason why the enthalpy change calculated in (i) differs from the enthalpy change for the decomposition of aqueous hydrogen peroxide.

参考答案:     查看本题详细解析

标记此题
17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The following graph represents the change of concentration of a gaseous rj,vr.o a *:cj3)cegt)je 12aba/kh9an4 r jch eactant and gaseous product during a reaction.at/,ea .h c)) c rrv9e2a4goh 3*j1jn akjj:bc At t=10mins, the temperature is increased and at t=15mins, the volume of the reaction vessel is increased.


参考答案:     查看本题详细解析

标记此题
18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sulfur dioxide ($SO_2$) reacts with oxygen and sulfuric acid($H_2SO_4$) to produce oleum($H_2S_2O_7$) in two reaction steps. The enthalpy cycle for this process is shown.

This process is used to produce a dilute solution of oleum in 5000g sulfuric acid from 0.80 mol sulfur dioxide. During the reaction, the temperature of the sulfuric acid increased by 22.8$^{\circ}C$.
What are the enthalpy changes of the second step,ΔH$_2$, and the overall process, ΔH$_total$, assuming no heat is lost during the reaction?
·Specific heat capacity of $H_2SO_4$,c=1.60Jg$^{-1}$K$^{-1}$;
·q=mcΔT.

参考答案:     查看本题详细解析

标记此题
19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Colorimetry was used to detey4a2(lgwl)2rri 9z+ - r ikwvqrmine the change in color for the below system at equilibrium as temperature increase2lk )q(+-4 g wl9yrwz2ir varis.
Which statement(s) is/are correct for the following reaction?


I.The forward reaction is exothermic
II.The backward reaction absorbs energy
III.$K_c$ decreases with increasing temperature

参考答案:     查看本题详细解析

标记此题
20#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The standard enthalpy of formah pjktw- 90y/ntion of gaseous nitric oxide,ΔH$_f^θ$(NO(g)),is +kJmol$-1$.
1.Write a reaction equation, including state symbols, corresponding to the standard enthalpy of formation of gaseous nitric oxide.
$\frac{1}{2}$$N_2$(g)+$\frac{1}{2}$$O_2$(g)→   (g)
2.Calculate the bond enthalpy of nitric oxide, using the value of ΔH$_f^θ$ (NO(g)) above and section 11 (Section 12- 2025 Syllabus) of the data booklet.
3.In the Ostwald process, nitric oxide (NO) is reacted with oxygen and then water to produce aqueous nitric acid ($HNO_3$) The overall equation and enthalpy change of this reaction are given below.
4NO(g)+3$O_2$(g)+2$H_2O$(l)→4$HNO_3$(aq)
ΔH$_1$=-576.4kJmol$^{-1}$
Calculate the enthalpy of formation of aqueous nitric acid, ΔH$_f^θ$(HNO$_3$ (aq)), using the values of ΔH$_f^θ$ (NO(g))= +90.3kJmol${-1}$,and
ΔH$_1$ and section 12 (Section 13- 2025 Syllabus) of the data booklet.
4.The nitric oxide used in the Ostwald process is formed by reacting gaseous ammonia (NH$_3$) with oxygen. The equation and enthalpy change of this reaction are given below.
$4NO(g)$+$5O_2(g)$→$4NO(g)$+$6H_2O(g)$
ΔH$_2$=-906.0kJmol$^-1$
The yield of the Ostwald process may be lower than expected if some of the nitric oxide product reacts with the remaining ammonia. The equation for this side reaction is shown.
$4NO(g)$+$6NO(g)$→$5N_2(g)$+$6H_2O(g)$
1.Calculate the enthalpy change for the side reaction, ΔH$_{side}$=-  (kJmol$^{-1}$);using the values of ΔH$_f^θ$ (NO(g)) and ΔH$_2$.
2.Suggest how the value of ΔH$_2$ would differ if water were produced in the liquid phase.

参考答案:     查看本题详细解析

  • :
  • 总分:20分 及格:12分 时间:不限时
    未答题: 已答题:0 答错题:
    当前第 题,此次习题练习共有 20 道题
    本系统支持习题练习,作业与考试三大模式,作业考试自动评分,成绩排序一键导出,可设定动态变量同一试卷千人千题
    如果您对本系统感兴趣,想加入我们或者想进行任何形式的合作,请加微信 skysky1258

    浏览记录|使用帮助|手机版|切到手机版|题库网 (https://tiku.one)

    GMT+8, 2024-12-25 15:57 , Processed in 0.173679 second(s), 61 queries , Redis On.