Argon is the third most common gas found in the air we breathe. The air we breathe has approximately 78% nitrogen and 21 % oxygen. The third more abundant gas in the air we breathe is Argon. It is available in a very small quantity in the air that we breathe.
The percentage of the gas argon is about 0.9% in the air
that we breathe. There are several other gases also present in the air that we
breathe, but they are found mostly in negligible amounts.
Answer:
B) water changes to ice
Explanation:
since its already water, it cant be anything beginning with steam.
Answer:
Absorb light energy
Explanation:
Chlorophyll absorbs light energy which is used to produce carbohydrate and oxygen in the presence of carbon dioxide and water.
Answer:
Endothermic
Explanation:
The temperature of the water decreased.
The water lost heat.
The heat must have gone into getting the KNO₃ into solution.
So, the dissolving of KNO₃ in water is endothermic.
Answer:
option D= it makes the reaction harder to start.
Explanation:
Activation energy:
It is the minimum amount of energy required by chemical specie to start the chemical reaction.
Explanation:
The activation energy is inversely related to the rate of reaction. The higher the activation energy the slower will be the reaction rate.
Molecules are colloid with each other and gain kinetic energy if this energy is higher than the transition state energy then molecules easily undergo the chemical reaction. Because molecules easily overcome the barrier i.e transition state.
When the kinetic energy is lower than molecules can not pass the barrier. They require the input which is called activation energy to pass the barrier.
The higher the activation energy, the difficult for the reaction to proceed. Catalyst are used to lower the activation energies because in this way lower will be the transition state, and higher will be the reaction rate.
