Question

State the conditions needed for a chemical change.

Answer 1

Answer:

Change of odor.

Change of color (for example, silver to reddish-brown when iron rusts).

Change in temperature or energy, such as the production (exothermic) or loss (endothermic) of heat.

Answer 2

Answer:

Explanation:

conditions necessary for a chemical reaction are : 1- a minimum amount of energy 2-the molecules or atoms of the reactants must collide with one another 3- the speed of the reaction should be appreciable 4- the rate of reaction depends on: 1- temperature 2- presence of light 3- electricity 4- pressure

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