The opposite graphical figure illustrates
the melting points of different elements,
among which is sodium „Na, which of
the illustrated letters represents sodium
element ? .
A
B
C
D

A

Explanation:

Sodium is a metal.. And characteristcs of metal indicates that they have low melting and high boiling point.

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

personal, she chose to do it.