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WorksheetsACP SEM 2
Total questions: 15
Worksheet time: 8mins
The equation shown represents a gas-producing reaction.
2KNO3 →2KNO2+O2
After 55.551 grams of solid KNO3 (molar mass = 101.102 g/mol) completely decomposes, what volume of oxygen gas, O2, is produced at Standard Temperature and Pressure (STP)?
6.154 liters
8.000 liters
12.31 liters
22.40 liters
Which statement correctly compares nuclear fusion and nuclear fission?
Fission requires a high-density and high-temperature environment,while fusion requires high
speed neutrons to initiate.
Fission requires little energy to initiate, while fusion requires extremely high energy input.
Fission is the splitting of a large atom into two or more smaller ones, while fusion is the union of two or more lighter atoms into a larger one
Fission is the union of two or more lighter atoms into a larger one,while fusion is the splitting of a large atom into two or more smaller ones.
What is the pH of a solution with hydrogen ion concentration of 1 × 10-6 M?
-6
10-6
6
log(-6)
Which substance is soluble in water?
Pb(CO3)2
Ag3PO4
Sn(CrO4)2
NH4Cl
Seventy grams of four salts are added to 100 grams of water in four separate beakers. The water in all four beakers is held at 50 °C. Which salt makes an unsaturated solution?
KNO3
NaCl
KClO3
K2Cr2O7
The unbalanced reaction shown represents the decay of U
What kind of particle must be emitted to balance this equation?
alpha
beta
neutron
positron
A student used calorimetry to determine the heat lost by a piece of candy as it cooled. She placed the candy in a beaker of water. The table shows the measurements she made during her experiment and the known value she used for the specific heat of water.
Based on the values in the table, how much heat was lost by the candy?
2170 J
836 J
518 J
58,5 J
An expandable container holds 15 liters of a gas at a pressure of 2.5 atm and a temperature of 320 K. The volume of the container is then increased to a new volume of 25 liters while the temperature is held constant at 320 K. What is the new pressure in the container?
0.7 atm
1.5 atm
2.5 atm
4.2 atm
Three cups of carbonated soda are lowered into cups of water at varying temperatures.
All other factors being equal, in which cup does the greatest release of dissolved gas occur?
CUP A
CUP B
CUP C
All cups will release an equal amount of gas, because temperature is not a factor.
Water is a molecule with slightly positive hydrogen atoms and a slightly negative oxygen atom. This unique arrangement gives water its
chemical stability
hydrophobic properties
nonpolarity
polarity
Which term describes the substance that is completely consumed during a chemical reaction?
excess reactant
limiting reactant
percent yield
theoretical yield
Which statement is one of the assumptions of the Kinetic Molecular Theory of Gases?
Collisions between gas particles and container walls are inelastic.
The temperature of a gas depends on the average potential energy of the gas particles.
Gas particles are much larger than the distance between them.
The volume of a gas is mostly empty space
A large beaker has 2.75 L of a solution containing 5.25 moles of copper (II) sulfate in water. What is the molarity of the solution?
2M
1.91 M
0.524 M
0.5 M
Ethyne, a fuel used in oxyacetylene torches, is produced from the reaction shown. 2C + H2 + 228.2 kJ → C2H2
Based on the equation, what type of reaction is used to produce ethyne?
Endothermic, because heat is absorbed
Exothermic, because heat is released.
Endothermic, because heat is released.
Exothermic, because heat is absorbed.
Two blocks of metal are separated and have different temperatures as shown. The blocks are then pushed together so that they touch.
Which statement describes the resulting heat flow?
Heat flows from Block1 to Block2.
Heat flows from Block2 to Block1.
There is no heat flow
Heat flows back and forth from one block to the other
