Quiz Final Chem 103, By With: RN.Osama AL Jawarneh
Final Chemistry Quiz 103
Test your knowledge in General Chemistry with our comprehensive 49-question quiz designed for beginners and advanced students alike. From stoichiometry to molecular geometry, this quiz covers essential topics that every chemistry enthusiast should know.
Key Features:
- 49 Questions to Challenge Your Understanding
- Diverse Topics in Chemistry
- Instant Feedback on Your Performance
The density of a piece of copper wire is 8.96 g/cm3 . Calculate the volume in L of a piece of copper with a mass of 4.28 g
0.477 x 10^-3 L
0.477 x 10^-3 ml
477 x 10^-3 L
477 x 10^-2 L
Convert -6.2°F to the Kelvin scale
251.8K
258K
151.8K
317K
( 12.1 – 3 – 2.21 )(44) ÷( 3.2 x 12 x 0.22 )=
1s.f
3s.f
2s.f
4s.f
The density of gold is 19.3 g/cm3 . Convert the density to lb/in3 ( 1lb=453.6g , 1in = 2.54 )
0.697 lb/in3
697 lb/in3
0.485 lb/in3
0.0982 lb/in3
The ion Mg+2 is considered to be from :
Cation & polyatomic ion
Anion & monatomic ion
Cation & monatomic ion
Anion & polyatomic
Magnesium reacts with a certain element to form a compound with the general formula MgX. What would the most likely formula be for the compound formed between potassium and element X?
K2X
KX2
K2X3
K2X2
KX
If 124 g of Al (mw=26.98) are reacted with 601 g of Fe2O3 (mw=159.7) , calculate the mass of Al2O3 (mw= 101.96) . 2Al + Fe2O3 → Al2O3 + 2Fe
233.48 g
233.48 Kg
394 g
136.46 g
How many atoms of nitrogen are in 10. G of NH4NO3?
3.5
1.5 X 10^23
3.0 X 10^23
1.8
30L of H2SO4 was interacted with 0.21M KOH , and the volume of KOH equals to 25L , at the end of the reaction . How much M of H2SO4 .
0.0875M
45.6 M
15.54 M
40.3 M
If there was 40ml of 1.00M HF react with 16g Cu , what the mass unreacted of Cu ? (M.W(Cu)=63.546)
13.44g
91.3
28.54
5.89
Which of the following applies to the rule of Octet: (Na+ , Ne , N-2 , Cl- , H , O , Al+2 )
Na+ , Cl- , Ne
Na+ , Cl-
Na+ , Cl-
N-2 , Cl-
How many resonance structures can be drawn for NO3– ?
1
2
3
4
5
The phosphorus trichloride (PCl3 ) molecule has what geometry?
Tetrahedral
Trigonal planar
Pyramidal
Trigonal bipyramidal
In the formic acid (HCO2H) molecule, the values of the bond angles, in degrees, are:
O–C–O = 180, C–O–H = 120
O–C–O = 120, C–O–H = 109
O–C–O = 180, C–O–H = 180
O–C–O = 109, C–O–H = 109
How many sigma and pi bonds are present in sulfur trioxide, SO3?
4 sigma bonds, 0 pi bonds
4 sigma bonds, 1 pi bond
3 sigma bonds, 0 pi bonds
3 sigma bonds, 1 pi bond
3 sigma bonds, 2 pi bond
A sample of nitrogen gas has a volume of 32.4 L at 20 C . The gas is heated to 120 C at constant pressure. What is the final volume ml of nitrogen ?
43907.5 ml
236.1 ml
9654 L
315.32 ml
Calculate the density of methane CH4 gas in a 3.80 L container at 790 torr and 100 C ? ( Mm C = 12 , Mm H = 1 )
631 g\L
0.538 g\L
0.796 g\L
58.3 g\L
How many liter of hydrogen at STP are produced from 50 gram of Na in the reaction ? M.m ( Na = 23 , O=16 , H=1 ) 2Na + 2H2O → 2NaOH + H2
42.2 L
16.3 L
13.54 L
24.36 L
A sample of H2 gas was collected over water at 21 C and P total 785 mmHg . The volume was 7.8 L . Calculate the mass of H2 collected ( vapor pressure of water at 21 C = 18.6 mmHg ) ?
0.283 g
0.577 g
7.14 g
0.651 g
A mixture of He and H2 in a flask at constant T . The present of He is 150 mmHg and that of H2 is 25 mmHg . If you have 0.56 g of He ( mm= 4 ) .How many grams of H2 ?
0.023 g
47.0 g
0.047 g
23.0 g
: If 12.8 g naphthalene, C10H8 , (M. Mass = 128 g/mol) is dissolved in 200.0 g chloroform, what is the molality (m) of the solution?
0.5 ml
0.5 m
1.9 m
0.1 m
What is the mole fraction of H2O ( mm = 18 ) in a water–ethanol solution that is 54% H2O by mass? (Ethanol is C2H5OH, molar mass = 46 g/mol)
8.12
3.46
0.75
1.35
A solution was made by dissolving 9.25 g of unknown non-electrolyte solute in 35 g of benzene ( mm = 78 g\mol ) at 25 C . The vapor pressure of pure benzene = 0.97 atm at 25 C . The vapor pressure of solution = 0.68 atm at 25 C . Calculate the molar mass of non-electrolyte solute ?
0.448 mol
46.8 mol
9.31 mol
647 mol
A 20.0 mg sample of a protein is dissolved in 25.0 mL of solution. The osmotic pressure of the solution is 0.56 torr at 25 °C. What is the molar mass of the protein?
634 x 10^7
2.65 x 10^-4
2.65 x 10^4
1.5 x 10^2
An aqueous nitric acid ( HNO3 ) has a density of 1.42 g\ml and 16.0 M .What is the the percent by mass of HNO3 in this solution ? ( mm HNO3 = 63 g\mol )
45 %
24 %
71 %
86 %
: If the rate is 0.02M.S- , the final time(t2 ) is 30 S , the primary(t1 ) is 0S , and the final concentraton(M2 ) is 1.2M , and calculate the initial concentration (M1 ).
0.6 M
0.1 M
2.3 M
1.0 M
Which of the following plots will be linear and will be used to determine the rate constant for first- order reaction, B – <C, at constant temperature? Select one :
1/[A]t versus time
[A]t versus time
Lnk versus 1/T
Ln[A]t versus time
The first-order reaction A → B, has k = 5.67 s–1 . If [A]0 = 0.500 M, how long will it take [A] = 0.124 M?
0.246 s
1.026 s
6.3 s
0.964 s
: What percentage of second order a material will persist after 140 minutes if it’s half life is 20 minutes?
100%M
25%M
50%M
12.5%M
Which of the following plots will be linear and will be used to determine the rate constant for zero- order reaction, B –< C, at constant temperature? Select one :
[A]0 versus [A]t
[A]0 versus t
[A]t versus t
[A]t versus k
The reaction 2A –< B + C is zero order in A. If the half-life for this reaction is 2.0 minutes and the initial concentration is 12.0 M, what is the rate constant, k?
3 M.S^-1
4.5 x 10^-4 M.S^-1
0.0175 M^-1 .min^-1
=0.8 M^-1 .min^-1
The rate constant (k) for a chamical reaction at 330k was 3 x 10-5 S -1 ,when the temperature increased to 310k the rate constant increased to 5 x 10-5 S -1 . Calculate the Ea for this reaction ? ( Gas constant R = 8.314J/mol.K) select one:
8.32 KJ
63 KJ
22 KJ
13.8 KJ
As a chemical reaction proceeds, the rate of the reaction tends to:
Increase.
Decrease.
Remain constant.
Oscillate.
Example of the amphoteric substance is
SO3
HF
NH3
HSO4-
What is the pH and pOH of 2 x 10^3- M HNO3 solution ?
9.5
11.3
7
12.1
What is the pH of a solution that is 0.05 M in Ca(OH)2?
14
5
13
9.8
Calculate the pH of a 0.020 M solution of H2C2O4 and Calculate the concentration of C2O4 -2 ? (Ka1 = 5.9x10-2 ) (Ka2 = 6.4x 10-5 )
11.8 / 3.4x10^-5
4.3 / 6.4 x10^-4
1.8 / 6.4 x10^-5
1.8 / 11.2 x10^-2
Determine the pH of a 0.50 M solution of NH3 The Kb of NH3 is 1.8x10-5 ?
8.95
11.48
2.52
5.05
For HC7H5O5 is 4.57x10-3 , what is the pKb for C7H5O5?
2.34
2.19x10^-12
11.56
7.81 x 10^-6
Which of the following lewis base:
Fe+
AlCl3
BCI3
F-
A lewis acid is defined as a substance that:
Acts as a pair of electrons donor
Acts is a proton acceptor
Acts as a pair of electrons acceptor
Acts is a proton donor
A substance that is capable of acting as both acid and as base is called:
Autocratic
Conjugated
Non of these
Amphoteric
Calculate the [OH- ] in a NaOH solution with a pH of 12.73.
1.27
1.9x10^-13
0.054
2.3 x 10^-12
The pH of 1 M HCl is:
1
0
2
-1
Which of the following possesses the greatest concentration of hydroxide ion?
A solution with a pH of 3.0
A 1x10-4 M solution of HNO3
A solution with a pOH of 12.0
Water
Which one of the acid shown in the table is the highest pH?
HCN
HNO2
HCHO2
HClO
Which one of the acids shown in the table is the strongest?
HOAc
HF
HNO2
HCN
) the pH of a 0.35 M solution of CH3NH2 .The Kb of CH3NH2 is 4.4x10^-4:
10.19
3.81
12.09
1.91
The pH of a certain solution is 3.0. How many H+ (aq) ions are there in 1.0 L of the solution?
0.001 ions
1,000 ions
6.02 x10^20 ions
6.02 x 10^26 ions
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