Worksheets11 Chemistry Practice Exam (Multiple Choice)
Total questions: 25
Worksheet time: 37mins
A compound is comprised of:
Only one type of atom
Only one type of molecule
Two or more types of molecules
Two or more elements chemically bonded
Consider the following equation. The numbers that fill the blanks to balance the equation are:
1, 0.75, 1.5, 0.25
2, 3, 6, 1
3, 2, 2, 4
4, 3, 6, 1
Accuracy and precision are defined as:
Accuracy: the extent to which a value represents the true value.
Precision: the number of decimal places in a value.
Accuracy: the extent to which the value is similar to the other values recorded.
Precision: the extent to which a value represents the true value.
Accuracy: the extent to which a value represents the true value.
Precision: the extent to which the value is similar to the other values recorded.
Accuracy: the number of decimal places in a value.
Precision: the extent to which the value is similar to the other values recorded.
Identify the electron configuration of a sodium ion.
1s22s22p6
1s22s22p63s1
1s22s22p63p1
1s22s22p63s23p6
The table shows the pH of different solutions. Which of the substances is acidic?
Black coffee only
Saliva and black coffee
Tears and oven cleaners
Saliva, tears, and over cleaners
Which of the following represents the enthalpy change of an endothermic reaction?
ΔH < 0
The products have a greater enthalpy than the reactants.
The energy required to break bonds is less than the energy of the bonds formed.
Four pairs of 0.1M solutions were mixed together, as shown in the table. Determine whether precipitates will form.
i: Yes. ii: Yes. iii: No. iv: No.
i: No. ii: No. iii: Yes. iv: Yes.
i: No. ii: Yes. iii: No. iv: Yess.
i: Yes. ii: No. iii: Yes. iv: No.
Four balloons are filled with hydrogen gas under different conditions. Identify the balloon that contains the greatest number of moles of hydrogen.
Balloon 1 - 25kPa, 200mL, 10oC
Balloon 2 - 100kPa, 500mL, 50oC
Balloon 3 - 50kpa, 400mL, 30oC
Balloon 4 - 25kPa, 300mL, 20oC
Which of the following has four significant figures?
0.0004
2.1390
4390
91360
Which of the following molecules is linear?
Carbon disulfide
Dihydrogen monoxide
Phosphorus trichloride
Silicon tetrabromide
Which of the substances is most likely to be ionic?
Substance A
Substance B
Substance C
Substance D
Which of the statements about these fictitious particles is true?
Particles X and Y are isotopes.
Particle X is an ion of particle Y.
Particle X is lighter than particle Y.
Particle X and Y are different elements.
Which of the following contains the greatest number of oxygen atoms?
0.75 moles of Ca(NO3)2
1.9 moles of LiNO3
2.4 moles of O2
3.5 moles of C2H5OH
The graph below shows the solubility of various substances over a range of temperatures. Which of the following states is supported by the data?
Sucrose is more soluble than silver nitrate at all temperatures.
Potassium nitrate is generally less soluble than sodium nitrate.
An increase of 10oC causes the solubility of silver nitrate to increase by 20g/100g.
Increasing the temperature has a significant effect on the solubility of sodium chloride.
Four identical flasks were set up with excess acids and granular zinc metal, but under different conditions. Predict which flask will have the slowest reaction rate.
Flask 1 - 1g Zn, 100mL, 1Mol HCl at 25oC
Flask 2 - 1g Zn, 100mL, 2Mol HCl at 35oC
Flask 3 - 0.5g Zn, 100mL, 2M HCl at 35oC
Flask 4 - 0.5g Zn, 100mL, 2M HCl at 55oC
Which of the following reactions could be used to make hydrogen?
Zinc and ethanoic acid.
Calcium carbonate and nitric acid.
Copper (II) sulphate and lithium hydroxide.
Potassium hydroxide and hydrochloric acid.
Determine the mass and uncertainty shown on the scale.
170.4 ± 0.1g
170.4 ± 0.01g
170.40 ± 0.1g
170.40 ± 0.01g
Which of these molecules is polar?
CO2
CF4
BH3
NH3
An unknown nitrate was mixed with a number of solutions. Deduce the identity of the unknown cation.
Ba2+
Cu2+
Pb2+
Zn2+
The energy profile of a reaction is shown below. Which of the following best matches the energy profile?
Ea(kJmol–1): 0, ΔH(kJ mol–1): 90
Ea(kJmol–1): 50, ΔH(kJ mol–1): 90
Ea(kJmol–1): 90, ΔH(kJ mol–1): -50
Ea(kJmol–1): 90, ΔH(kJ mol–1): -140
Determine the Rf of substance A.
1.4
1.0
0.7
0.3
Which of the following is an empirical formula?
WO2
C6H6
(CH3O)2
Fe3(CO3)9
The ionisation energies of an element are shown on this graph. Deduce the group of the element.
2
4
11
13
The combustion of ethanol is:
C2H5OH(l) + 3O2(g) -> 2CO2(g) + 3 H2O(g)
(ΔH = -1367kJmol-1)
Calculate the amount of energy released from the combustion of 12.5g ethanol.
371kJ
589kJ
1367kJ
17088kJ
Estimate the pH of a solution that was the following colours when tested with a range of indicators.
3.7
5.5
6.4
8.8
