Lab chem 107

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Lab Chemistry Quiz 107

Test your knowledge in lab chemistry with this engaging quiz designed for students and educators alike. Explore various topics including chemical reactions, solution calculations, and acid-base titrations.

  • 20 challenging questions
  • Multiple choice format
  • Instant feedback on your answers
20 Questions5 MinutesCreated by MixingChemical123
The lowest scaling of a graduated cylinder is 0.1 ml , Then the precision of this cylinder is:
0.1
0.2
0.01
0.05
A mixture containing 20%NaCl , 0.45g SiO2 and unknown amount of NH4Cl. When the mixture heated, its mass was decreased to 1.75(g) . The mass of NH4Cl in this mixture is:
6.5
8.25
1.3
4.75
Given the following reaction: 2Al+6HCl---->2AlCl3+3H2........When 2g of Al (mm=27) is reacted completly with excess HCl, it gives 4.6g of AlCl3(mm=133.5). The percent yield of this reaction is:
53%
47%
64%
15%
The active ingrediant in Bleach is:
HCl
Cl2
Cl- ion
NaOH/Al
Calculate the freezing point of 65% etheleneglycol (mm=62), for water kf=1.86 and Tf=0
16.2
-16.2
55.7
-55.7
A 0.567g sample of an umknown diprotic acid requires 8mL of 0.2M NaOH to reach the end point, the molar mass of the acid is:
708.8
354.4
2.82*10^-3
105
The color of pH.pH indicator is:
Pink in NaOH
Colorless in NaOH
Pink in H2SO4
None of these
When 6g of NaOH (mm=40) disssolved in 90g of water, the temperature was increased from 22C to 27C . If specific heat of solution is (4.18J/g.C) and the density is (1g/mL).the heat of this solution in(KJ/mol) is:
9.2
7.1
25.9
13.4
When 2g of NaOH dissolved in 50g of water, a 16.2KJ of heat was evolved. If the same amount of NaOH dissolved in 50g of HCl solution, the amount of heat evolved is :
Equal 16.2KJ
Lower than 16.2KJ
Higher than 16.2KJ
Equal to zero
How many grams of Cu(mm=63) could be produced through the reaction of 15mL of 0.8M CuSO4 solution with excess Zn: Zn+CuSO4----->ZnSO4+Cu
0.76g
0.57g
0.19g
0.38g
The element that has ability to gain electrons is classified as :
Oxidized element and oxidized agent
Reduced element and reducing agent
Oxidized element and reducing agent
Reduced element and oxidizing agent
In the following reaction : CuSO4+Zn----->Cu+ZnSO4 ... The reduced species is
CuSO4
Cu+2
Zn
Cu
In the experiment of determination the rate law of the reacion between H2O2 and KI , the concentration of hydrogen ion was stablized by the addition of ........ To the reaction
KI
Buffer
Na2S2O3
Starch
If the total concentration of H2O2 is 0.04M and initial concenration of KI is 0.02M and the reaction is zero order in KI and first order in H2O2, the value of K is:
7*10^-4
3.5*10^-8
4.66*10^-5
2.33*10^-3
The following data in the table was obtained for the reaction : A+B--->C+D
**from these data what is the overall order of the reaction :
experiment number [A] [B] INITIAL CONCENTRAION
1 0.06 0.03 0.0248
2 0.02 0.03 0.00276
3 0.02 0.09 0.00828
1
2
3
4
A reacts with C as :A+3C--->2B+D
an aqueous solution containing initially 0.05M of A and 0.072M of C is prepared and the progress of the reaction followed by measuring [C]
The concentration of A remaining at 400s is ........ M.
TIME (S) 0 400 800
[C] (M) 0.072 0.057 0.046
0.015
0.035
0.045
-0.007
The color of PbCrO4 is :
White
Black
Yellow
Dark blue
The missing reagents (X,Y) respectively in the following reaction are:
X+2NH3---->Hg+Y+NH4Cl
Hg/Hg2Cl2
Hg2Cl2/Hg
Hg2Cl2/HgNH2Cl
HgNH2Cl/Hg2Cl2
You can separate PbCl2 from mixture of Hg2Cl2 and AgCl by adding
Hot water
HCl
NH3
K2Cr2O4
In ACID-BASE TITRATION experiment , when you want to add the base to the acid you will use the :
Beaker
Flask
Graduated cylinder
Buret
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