Be sure to answer all parts. A mixture of gases contains 0.330 mol CH4, 0.250 mol C2H, and 0.270 mol CzHg. The total pressure
is 1.25 atm. Calculate the partial pressures of the gases.
(a) CH4
atm
(b) C2H
atm
(c) CzHg
atm

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 answer for sodium is 0.186

the answer for rubidium is 0.251

answer: e.   sour taste

explanation: acids are those substances which dissociates in water to give ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. acids are sour in taste. example: hcl

bases are those substances which dissociates in water to give ions or accepts ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. bases are bitter in taste. bases are slippery in nature.