Answer:
A. it contains a lot of matter
Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color chage, formation of a precipitate, formation of a gas, odor change, temperature change.
Answer:
A strong base increases the OH- ion concentration in an aqueous solution.
Explanation:
According to the Arrhenius theory, acids donate H+ and bases donate OH- to a solution.
Answer:
1) chewing breaks food into smaller pieces.
Explanation:
Chewing food changes the <u><em>PHYSICAL </em></u>appearance. The sugars in the other possible answer will completely change the composition of the food. So therefore, chewing breaks food into smaller pieces, is correct.