The kinetic energy of gas molecules is directly proportional to the square of their speed. When the speed doubles, the kinetic energy increases by a factor of 2^2 = 4, hence it increases by four times.

Borax is more soluble in hot water due to increased kinetic energy of particles at higher temperatures, allowing it to dissolve more easily.

The total energy of a system is the sum of its potential energy (stored energy) and kinetic energy (energy of motion), which remains constant in a closed system.

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Algae are photosynthetic organisms that can harness solar energy and convert it into chemical energy, making them suitable to serve as aquatic solar fuel cells. This ability is being explored for biofuel production.

When a gas is heated, its particles gain kinetic energy. In this case, the gas is heated from 300K to 600K. To convert temperatures from Kelvin to understand the change in kinetic energy better, we can use the formula: (new temperature - initial temperature) / initial temperature. Plugging in the values, we get (600K - 300K) / 300K = 2. This means the kinetic energy doubles when the gas is heated from 300K to 600K. Therefore, the correct answer is 'Double'.

In an endothermic reaction, energy is absorbed to proceed forward. Conversely, energy of activation for the reverse reaction is lower, as less energy is required to break bonds and release reactants. This is because the reaction proceeds in the forward direction with higher energy, making the reverse reaction easier.

In a gas, molecules move at different speeds, not the same speed. This is because gases are made up of particles with different kinetic energies. The other options are all true statements about gases.

The frequency of effective collisions between reactant molecules is the primary factor that determines the activation energy required for a chemical reaction to occur.

As temperature increases, the kinetic energy of the particles in the liquid increases, allowing them to move more freely and easily, resulting in a decrease in viscosity. This is because the increased thermal motion helps to reduce the interactions between molecules.