which of the following is a chemical change
a.boiling water
b.melting a cube of ice
c.dissolving 10 grams of salt in water
d.splitting water into hydrogen and oxygen
my answer: c
not c.
then is it the last one?
yes: 2H2O>>>2H2 + O2 is a chemical change
To determine which of the given options is a chemical change, we need to understand the characteristics of a chemical change. A chemical change involves a transformation at the molecular level, resulting in the formation of new substances with different properties.
Let's analyze each option to find out the chemical change:
a. Boiling water: Boiling is a physical change and not a chemical change. When water boils, it changes from a liquid state to a gaseous state, but no new substances are formed.
b. Melting a cube of ice: Like boiling water, melting ice is also a physical change. The solid ice converts into liquid water, but the composition of the substance remains the same.
c. Dissolving 10 grams of salt in water: This is a physical change, not a chemical change. When a substance dissolves, it mixes with the solvent at the molecular level. However, no new substances are formed in this process.
d. Splitting water into hydrogen and oxygen: This is indeed a chemical change. When water is split into hydrogen and oxygen gas, new substances are formed, and their properties are distinct from those of water.
Therefore, the correct answer is d. Splitting water into hydrogen and oxygen.