A.
Because you increase the concentration of the reactants, it means that there are more molecules of the reactants present in a smaller amount of space.
This being the case, there is a higher chance that these molecules will collide with enough energy to overcome the activation barrier.
The other ones are completely wrong, but if you would like an explanation as to why they are, just ask :)
Answer:
new moon
Explanation:
A solar eclipse take place at new moon phase, when the moon passes between the earth and the sun and its shadows fall on the Earth's surface which by definition a solar eclipse.
1. The topography (relief) of an area can influence the weather and climate, for example being close to water can make for a milder climate while areas in the mountains are more likely to have extreme weather and can act as a barrier to air movement or water.
2. Bodies of water can affect a climate because water heats and cools slower than land meaning that coastal areas will stay cooler in summer. Water will create a moderate climate with a narrow temperature range.
Answer:

Explanation:
Assuming no energy lost, according to the law of conservation of energy, the kinetic energy of the automobile becomes potential energy after the crash:

Here m is the automobile's mass, v is the speed of the car before impact, k is the "bumper" constant and x is the compression of the bumper due to the collision. Solving for v:

Answer:
His conclusion best illustrates a pessimistic outlook.
Explanation:
As seen in the question above, Ken got 20% of his final grade in the first test he did for this class, that is, there will be other tests that can provide him to reach the grade needed to pass the class. However, even if there are possibilities, he believes that he will not pass the class, he does not have a positive and optimistic view of his future in this class and is sure that he will fail. This negative view of the future is an example of a pessimistic outlook.