A precipitate, water, or a gas must be produced for a double displacement reaction to occur.
For an energetically favorable reaction to occur, the reactants must have lower energy than the products, and the reaction must release energy rather than absorb it. This is known as having a negative change in free energy (G) for the reaction to proceed spontaneously.
For the reaction to occur at room temperature, an external energy source must be provided to drive the reaction, and the reaction will absorb heat from the surroundings. The reaction is non-spontaneous because it does not occur naturally without intervention.
This isn't answerable without knowing what the chemical reaction is. Some reactions are very easy to initiate - alkali metals and halogens will react with little to no prodding. Others require intermediate reactions.
To determine if a reaction will occur through double replacement, one must check if the ions in the reactants can form new compounds by exchanging partners. If a solid, gas, or water is formed during the reaction, it is likely to occur. Additionally, one can use the solubility rules to predict if a precipitate will form.
Activation energy is the minimum amount of energy required for a chemical reaction to occur. It acts as a barrier that must be overcome for the reaction to proceed. In a diagram, activation energy is typically represented as the energy difference between the reactants and the transition state of the reaction. This barrier must be crossed for the reaction to take place.
A precipitate, water, or a gas must be produced for a double displacement reaction to occur.
Oxygen gas must be present for a combustion reaction to occur.
Usually a reaction must produce some sort of gas to be explosive.
To get an allergic reaction you must be allergic to this food. If it enters the mouth,eyes, nose or any place that has an opening you will get the reaction.
Energy must be absorbed to break chemical bonds for a reaction to occur. This energy input is needed to overcome the bond's stability and allow new bonds to form in the reaction.
The two forces must be equal and opposite.
For an energetically favorable reaction to occur, the reactants must have lower energy than the products, and the reaction must release energy rather than absorb it. This is known as having a negative change in free energy (G) for the reaction to proceed spontaneously.
The light reaction produces ATP and NADPH, which are needed to fuel the dark reaction. The dark reaction (Calvin Cycle) uses the ATP and NADPH produced in the light reaction to fuel the conversion of carbon dioxide into glucose. In essence, the light reaction provides the energy source that drives the dark reaction.
For the reaction to occur at room temperature, an external energy source must be provided to drive the reaction, and the reaction will absorb heat from the surroundings. The reaction is non-spontaneous because it does not occur naturally without intervention.
WE CAN GET VACUU BY REMOVING AIR BY VACUUM PUMP.
There are many factors that affect the occurance of a chemical reaction. If the reaction you are using has any buffer or catalyst than you should be selective in that keeping in mind your reactants and product. The temperature required for any particular reaction to occur should also be kept in mind.
To obtain new substances a chemical reaction is needed.