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WorksheetsBiochem
Total questions: 16
Worksheet time: 7mins
Which of the following transformations of state is impossible to happen?
solid - energy --> liquid
gas - energy --> liquid
solid + energy --> gas
solid + energy --> liquid
liquid + energy --> gas
Which of the following binary compounds is formed by ionic bonds?
phosphorus trichloride
dinitrogen monoxide
magnesium oxide
carbon disulfide
None of the above
What is the specific gravity of a substance with a density of 6.5 x 10^3 kg/m^3? (Note: 1 kg = 10^3 g; 1 m^3 = 10^6 cm^3)
6.5
0.65
65
6.5 g/ml
6.5 g/cm^3
"In calculations involving multiplication and division, the final answer is rounded off to the same number of significant figures as the measurement with the least number of significant figures. " How do you express the final product of 2.100 m x 0.70 m x 1.0 m?
0/1
1.4700 cubic meters
1.470 cubic meters
1.47 cubic meters
1.5 cubic meters
2 cubic meters
Which of the following processes /chemical reactions is endothermic?
photosynthesis
Burning of paper
dissolving powder detergent in water
rusting of iron / corrosion of metals
Respiration
How many centigrams are there in 2.05 x 10^-4 kg? (centi = 10^-2, kilo = 10^3)
2,050 cg
205 cg
20.5 cg
2.05 cg
20,500 cg
An atom of a representative element has seven valence (outermost) electrons and four occupied main energy levels (n=4). What is the position of this element in the periodic table?
Period 4, Family VII-A
Period 7, Family IV-A
Period 4, Family IV-A
Period 7, Family VII-A
Period 3, Family III-A
A mixture of _____ will always form a solution if they do not react chemically.
a gas in another gas
a liquid in another liquid
a solid in liquid
a solid in another solid
All of the above
If the density of a liquid is 1.20 g/mL, what is the mass in kilograms of 850.0 mL of the liquid?
1,020 kg
102 kg
10.2 kg
1.02 kg
0.102 kg
Which of the following expressions is equal to 205,600 grams? (all zeros are significant)
2.05600 x 10^2 (kg)
2.0560 x 10^2 (kg)
2.0560 x 10^1 (kg)
20.560 kg
None of the above
Which of the following measurements of length is not equal to 127 cm?
1,270 mm
50 inches
0.00127 km
12.7 m
None of the above
Which of the following compounds has the lowest gram-molecular weight? Atomic weights: C =12, O = 16, N = 14, H = 1
Carbon dioxide, CO2
Nitrogen Dioxide, NO2
Ethane, C2H6
Ammonia, NH3
Methanol, CH3OH
If the density of a liquid is 1.20 g/mL, what volume will be occupied by 0.042 kg of the liquid?
0.035 mL
0.35 mL
35 mL
350 mL
None of the above
Which element has the highest mass in the compound monosodium glutamate (MSG) C5H8O4Na? Atomic masses: C = 12, H = 1; O = 16; Na = 23
Carbon
Hydrogen
Oxygen
Sodium
Carbon and oxygen
What relationship, if any, exists between the number of electrons and protons in a monatomic (1 atom) cation?
The number of protons and electrons are the same.
The number of protons is greater than the number of electrons.
The number of electrons is greater than the number of protons.
The number of protons is greater than the number of neutrons.
The number of electrons is equal to the number of protons.
