U3 AOS1 SAC1 T1

Question 1

WHAT IS THE IDEAL GAS EQUATION, and specify what units each of the values should be in?

Answer 1

PV=nRT, P=kPa, V= in L, n=mol, R=8.31, T=Kelvin.

Question 2

If we took a 1L vessel cointaining O2 gas , another 1l vessel cointaining a different gas ( say N2 gas) , and a third vessel cointaing a mixture of 02 and N2 gasses , all at the same tempurature and pressure, the amount of gas molecules in each vessel would be would be?

Answer 2

The same number of molecules in each vessel.

Question 3

What are the 2 standard laboratory conditions (SLC)?

Answer 3

25 deg celicus AND 100kPa.

Question 4

In energy profiles, Chemical Energy is also known as?

Answer 4

Chemical energy is also known as Enthalpy.

Question 5

In energy profiles, Thermal Energy is also known as?

Answer 5

Thermal energy is also known as Heat.

Question 6

Activation Energy?

Answer 6

This is the minimum amount of energy needed to break the bonds in reactions, and therefore commence the reaction. It is depicted by EA on the energy profile diagram.

Question 7

Exothermic Reaction?

Answer 7

This is when there has been a net realsea of enegry byt the reaxtants. This is because the enegty realsed during the breaking of the reactants is lower than the enegry used when the bonds in the products are formed- This is why excess enegry is realsed.

Question 8

Endothermic Reaction?

Answer 8

This is where there has been a net absorbption of enegry by the reactants. Ths is because the enegry realsed during the breaking of the reactants is higher than the enegry used when the bonds in the products are formed- This is why additional enegry needs to be absorebed.

Question 9

How To Know If The Reaction Is Endothermic Or Exothermic, Using (^H)- delta H?

Answer 9

If ^H is positive then it is a a enothermic reaction.
If ^H is negative then it is a exothermic reaction.

Question 10

In The enegry profile for an exothermic reaction is the slope going up and then it platous or is it going down and then it platuies?a

Answer 10

It is going down and then it platuoues.

Question 11

In The enegry profile for an endothermic reaction is the slope going up and then it platous or is it going down and then it platuies?a

Answer 11

It is going up and then it platuoues.

Question 12

In enegry profiles for both (exo and endo)-thermic reactions, what are the labels of the (X and Y)- Axis?

Answer 12

X-AXIS=Time.
Y-AXIS=H(enthalpy).