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What are the 2 reasons why a decrease in temperature slows a chemical reaction?
Wiki User
∙ 12y ago
Decreasing the temperature reduces the kinetic energy of the molecules involved. This means that fewer molecules have the activation energy required to actually react.
It also means that molecules will collide less often.
Wiki User
∙ 12y ago
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What are the reasons that exfoliation of granite occurs?
Exfoliation of bodies of granite rock can occur from chemical weathering of the surface, differences in temperature, salt crystallization, and release of pressure.
When hydrogen burns in air the change is chemical Give two reasons to support this assertion?
When hydrogen burns in air with H2+O2= H20
Why is baking a cake is chemical change?
Baking is a chemical reaction for a few reasons. First off, heat is being applied to change a substance (cake mix / batter) into another substance (baked cake). Reactions occur such as water and moisture turning to steam as a result of the heat, and ingredients like water and baking soda / powder react to create a fluffy cake.
Is heating and cooling are examples of a chemical change?
Heating can be due to a chemical change, for example burning a fuel is in effect a chemical reaction with oxygen. Also some chemical reactions are exothermic, ie they produce heat. Not so many produce cooling, but one is the combination of ice and salt.However heating and cooling happen for other reasons as well, so you can't say they are examples of chemical changes. It is correct to say that some chemical changes result in heating and cooling.
Why do you want to control the rate of a chemical reaction?
There are several reasons you might want to control the rate of a chemical reaction: A) the reaction occurs very slowly in normal conditions (like rusting) but you want to do it more quickly (like fake antiques). B) the reaction normally occurs quickly, but you want to slow it down so it lasts longer (like in some batteries) C) most reactions can be more or less efficient depending on the reaction rate and other conditions, often (like in engines) you want the reaction rate that will be most efficient under a set of given conditions. D) some reactions might be more difficult to manage unless they are slowed down.
How do manufacturers decided which reaction to use in excess in a chemical reaction?
The cheaper reagent is usually the reagent that is used in excess. This procedure is purely for economic reasons.
Possible reasons why a rabbit population may decrease?
Death and migration are factors that can decrease hare population.
What are the reasons why populations of organisms increase or decrease?
there are many reasons a population or organisms would increase or decrease. some reasons are diseases, predator increase/decrease, good/bad weather, and enough/not enough resource's. :) yep
How do manufacturers decide which reactant to use in excess in a chemical reaction?
The cheaper reagent is usually the reagent that is used in excess. This procedure is purely for economic reasons.
What are some reasons for the decrease in fish numbers world wide?
Global warming. The temperature of the water in a lot of places world wide has increased rendering some species under threat.
Why a test tube so tall and skinny?
The reasons why a test tube is tall and skinny is that if we put a little amount of chemical into it, we are able to see it easily. Another is that we can find how a reaction happens without the reaction spilling all over the place
What are the reasons that exfoliation of granite occurs?
Exfoliation of bodies of granite rock can occur from chemical weathering of the surface, differences in temperature, salt crystallization, and release of pressure.
When hydrogen burns in air the change is chemical Give two reasons to support this assertion?
When hydrogen burns in air with H2+O2= H20
Reasons for rapid increase in population?
Immigration, decrease in infant mortality, increase in birth rate, decrease in mortality.
When lumps of ice are added to the acid the rate of the reaction slowed down give two reasons why this would happen?
The reaction is slower because lumps were used instead of smaller pieces thus the surface area is small and so the acid has less space to act on and the ice decreases the temperature, the higher the temperature the faster the reactions
What are some of the reason for a Gram variable reaction?
what are some of the reasons for a gram-variable reaction
What are five signs of a chemical reaction?
-Colour -Temperature -Light -Gas produced (Bubbles) -Precipitate -Hard to reverse Examples: Cooking an egg: This is a chemical reaction for several reasons. As you cook an egg the temperature increases, also the colour of the whites change, and it is very hard to reverse. Melting a block of ice: This would not be a chemical change because it is rather known as a Physical Change. A physical change includes signs as decrease in size or change in state. In this situation the block of ice is going from a solid, to a liquid.
