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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.

Gases deviate from ideal behavior under conditions of high pressure and low temperature. At high pressures, gas molecules are closer together, leading to stronger intermolecular forces. At low temperatures, gas molecules have less kinetic energy, making intermolecular forces more significant.

The velocity of a photon is related to its energy and the medium it travels through. In a vacuum, the velocity of a photon is independent of its wavelength. This is due to Einstein's famous equation E=hf, where E is the energy, h is Planck's constant, and f is the frequency of the photon. Since frequency is inversely proportional to wavelength (f = c/λ, where c is the speed of light), the energy remains constant, leading to a constant velocity in a vacuum.

Micronutrients are essential elements that plants need in minuscule quantities for various functions like enzyme activation and photosynthesis. While nitrogen and phosphorus are also crucial, they are required in larger amounts and are not classified as micronutrients.