Metals rusting, wood or fuel burning, yeast fermenting sugar, and cellular respiration are common chemical reactions.
Explain why energy is necessary to chemical reactions, and describe some common sources of energy.
Energy is necessary for chemical reactions because it allows molecules to overcome activation energy barriers and initiate reactions. Common sources of energy for chemical reactions include heat, light, electricity, and catalysts. These sources provide the necessary energy to break existing bonds and form new ones during a chemical reaction.
These are decomposition reactions.
yes some chemical reactions are harmful to us. as digestion of food, photosynthesis, decomposition of organic waste are some examples of the useful chemical reactions.
Metals rusting, wood or fuel burning, yeast fermenting sugar, and cellular respiration are common chemical reactions.
Some signs (or evidence) of chemical change are: a gas is produced, the temperature changes, a substance disappears, a solid is formed a colour change occurs, a new odour is produced.
Heat helps chemical reactions to take place. Light can also cause some chemical reactions to take place.
Oxygen as most reactions have it although it could also be hydrogen
nothing
magazines
Chemical reactions can produce a variety of products, including gases, liquids, solids, or energy in the form of heat or light. The specific products depend on the reactants involved and the nature of the reaction.
some chemical changes can be reversed but they are hard to reverse usually