Which characteristic is typical of metals?

Metals are malleable.

Explanation:

The metals are the substances possessing an abundant amount of electrons. They are placed majorly on the left side of the periodic table. The metals are considered as the good conductors of electricity and heat, they are lustrous in appearance, and usually have a high melting point. However, the main property, which distinguishes it from other substances is that they are malleable and ductile, that is, they can be transformed into wires and thin sheets.

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

the ratio of the conjugate base to the acid required to attain the desired ph.