Answer:
Option: B
Explanation:
Eating is a chemical process since it is irreversible and the initial products can't be obtained back.
While eating the food is digested by chemical enzymes which act as a catalyst.
So the reaction is chemical reaction. Similarly when fire is burnt the coal is changed into ashes.
This is combustion reaction and takes place in the presence of oxygen. Hence combustion is also a chemical reaction.
Learn more about chemical energy
Explanation:
D is the correct answer. Chemical reaction rates won't always be constant, you can change the rate of a chemical reaction. Factors that affect chemical reaction rates would be temperature, the concentration (pressure) of the reactant, or just the general surface area (crushing a reactant would be an example). Solvent polarity can also decrease the rate of a chemical reaction. Therefore, A, B, and C are true, leaving D as the answer.
Answer:
Ionic
Explanation:
Any metal with a nonmetal is an ionic bond due to the transfer of electrons.
Texture is a physical property that describes a substances surface