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Chemistry is the study of matter, which is anything that has mass and takes up spaces. Changes in matter is best described as physical properties, can be observed without changing the substance into another substance, and chemical properties, a substance that describes it's ability to change into other substances. An example of a physical property is melting point and flexibility. An example of a chemical property is burning and rusting.

Chemical changes may also occur when bonds break and new bonds are then formed. As a result of this, a new substance is formed. Something you can look for in physical properties are changes in color and if gases are produced from solids or liquids.

answer: the primary difference between a hypothesis and a theory is that b hypothesis is falsifiable, but a theory has been proven to be correct. theory is an explanation of something that is happening but hypothesis is a guess of something that can happen

explanation:

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.