Which of the following are examples of a chemical change?
a)corrosion reactions
b)combustion reactions
c)dissolving of sugar
d)evaporation of water
e)decaying reactions
f)digestion of food
Answer: a, b, c, e, and f
Please correct me if I'm wrong, thanks
Dissolving sugar is a physical reaction, not a chemical reaction. The others you have are correct.
Thank You :-)
You are correct! Chemical changes involve the transformation of substances into new substances with different chemical properties. Here's an explanation of why each of the options you provided represents a chemical change:
a) Corrosion reactions: Corrosion occurs when a metal reacts with oxygen or another substance in its environment, forming metal oxides or other compounds. This process results in the deterioration or decay of the metal, making it a chemical change.
b) Combustion reactions: Combustion is the rapid oxidation of a substance, typically involving the reaction of a fuel (such as wood, gasoline, or natural gas) with oxygen to produce heat, light, and new chemical compounds like carbon dioxide and water.
c) Dissolving of sugar: When sugar (a substance composed of carbon, hydrogen, and oxygen atoms) dissolves in water, the sugar molecules separate and disperse throughout the liquid. This process involves the breaking of intermolecular bonds between sugar molecules and the formation of new bonds between sugar and water molecules, resulting in a solution. Therefore, it is a chemical change.
d) Evaporation of water: The evaporation of water is a physical change, not a chemical change. During evaporation, the water molecules transform from the liquid state to the gaseous state without undergoing any chemical reactions.
e) Decaying reactions: Decay refers to the process of organic substances, such as food or plant matter, breaking down and decomposing over time. Various chemical reactions occur during decay, involving the breakdown of complex organic molecules into simpler compounds and the release of gases or odors. Therefore, decay represents a chemical change.
f) Digestion of food: Digestion is a complex process that occurs in our bodies, allowing us to break down the food we consume into smaller molecules that can be absorbed and used as nutrients. This process involves various chemical reactions, such as hydrolysis, where enzymes break down large molecules like proteins, carbohydrates, and fats into simpler compounds. Hence, digestion is a chemical change.
Overall, options a, b, c, e, and f represent examples of chemical changes.