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Which event must always happen for a chemical reaction to occur?
Wiki User
∙ 11y ago
An existing bond must be broken or a new bond must be formed, or both.
Wiki User
∙ 16y ago
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What is a Catalyst mean in chemistry?
In Biology, a catalyst is a substance which speeds up a chemical reaction, without being changed themselves. Biological catalysts are found in living organisms.
What is meant by chain reaction in nuclear reactor?
Basically a chain reaction (nuclear or chemical) is a self sustaining auto-catalytic reaction.In a nuclear reactor it is a neutron chain reaction, where each neutron released in every fission event can trigger another fission event. In a nuclear reactor the excess neutrons must be disposed of, which is the purpose of the control rods so that the reaction can be kept at some desired constant rate.
Why is the burning gasoline in a car a chemical change?
Chemistry is just a subset of physics in general. A chemical event is the interaction of electrons of one atom with neighbouring atoms. For certain such interactions to take place, energy has to be added. Heat causes the molecules of gasoline to break apart and recombine with oxygen in the air. This in turn releases more energy, so the reaction continues around it as long as there is gasoline and oxygen available. Heat is really just "more frantically moving atoms". With sufficient movement, the energy causes chemical bonds, i.e. the configuration of electrons between atoms, to break or be made.
When paper turns yellow after a few weeks is it a chemical change or a physical?
Physical (I'm pretty sure). If there is no change in the formula/chemical makeup/etc. then the change is purely physical. If the newspaper ceased to be a newspaper and became something else, then it would be chemical.
Cooking a chemical or physical change?
Both of those processes are parts of cooking. It depends on what you're doing. If you're melting or freezing its a physical change. If you're changing it into another substance then its chemical. A chemical change is when a substance is changed into another entirely different substance. This happens when an event occurs that changes the composition of the substance. Examples of chemical changes are color changes, absorbing energy, releasing energy, odor changes, producing gases, producing solids, and can't be easily reversed. A physical change is when there is a change is physical properties. This happens when an event occurs that doesn't change their chemical. Examples of physical changes are changes in the texture, shape, size, color, odor, volume, mass, weight, and density.
If a plant does not have enough water which event will happen first?
A decrease in the rate of the light reaction
What is a catylast?
a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change. a person or thing that precipitates an event.
What is evolution by a chance event called?
I think you want genetic drift. That is a random event, which is subtly different than a chance event, though a chance event, such as an unforeseen accident can be part of it. Accidents always happen by chance, but to be random they happen in no set numerical order.
What is a Catalyst mean in chemistry?
In Biology, a catalyst is a substance which speeds up a chemical reaction, without being changed themselves. Biological catalysts are found in living organisms.
How does the essay i just couldn't put it down describes the plot?
As a chain reaction of a series of events in a story
How can you tell a chemicall reaction has happened?
The most obvious event to look for to indicate a chemical reaction is the production of heat. All chemical reactions produce heat.
Is probability always a fraction?
Only when an event is probability to happen between a range of 1 to 0 then it is a fraction.
An event that will definitely happen is an event with what percent probability?
An event that will definitely happen is an event with 100% probability.
Can -1.5 be the probability of an event?
No. The probability of an event ranges from 0 (the event will not happen) to 1 (the event will happen).
What is a probability of 0 which means the event has to happen?
If the probability of an event is zero then that event cannot happen
Is stimulus a reaction to an internal event?
A stimulus is not a reaction, a stimulus is what causes a reaction.
What is meant by chain reaction in nuclear reactor?
Basically a chain reaction (nuclear or chemical) is a self sustaining auto-catalytic reaction.In a nuclear reactor it is a neutron chain reaction, where each neutron released in every fission event can trigger another fission event. In a nuclear reactor the excess neutrons must be disposed of, which is the purpose of the control rods so that the reaction can be kept at some desired constant rate.
