1. What is the volume
occupied by 20.4 liters of
CO2 at 1200 Torr when it is
at STP

Explanation:

From your question you’ll have to assumethat the temperature is constant,since you do not have an initial temperature.

If thats the case thrn you can use;

P1V1=P2V2 to calculate the second volume.

P1=1200 torr

P2=760 torr

V1 = 20.4L

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

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.