ACP SEM 2

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