Answers to Timed Assignmenton

Gases, Atomic Structure and Physical PeriodicitySection A

1. Which one of the following diagrams correctly describes the behaviour of a fixed mass of ideal gas? (T is constant.) A B C D

pv

p

pv

p

pv

p

pv

p

1. Which one of the following diagrams correctly describes the behaviour of a fixed mass of ideal gas? (T is constant.)

All four graphs have the same axes.

1. Which one of the following diagrams correctly describes the behaviour of a fixed mass of ideal gas? (T is constant.)

All four graphs have the same axes.

y axis - pV

x axis - p

1. Which one of the following diagrams correctly describes the behaviour of a fixed mass of ideal gas? (T is constant.)

All four graphs have the same axes.

y axis - pV

x axis - p

p V = n R T

y = m

1. Which one of the following diagrams correctly describes the behaviour of a fixed mass of ideal gas? (T is constant.)

All four graphs have the same axes.

y axis - pV

x axis - p

p V = n R T

y = m

pV

p

1. Which one of the following diagrams correctly describes the behaviour of a fixed mass of ideal gas? (T is constant.) A B C D

pv

p

pv

p

pv

p

pv

p

1. Which one of the following diagrams correctly describes the behaviour of a fixed mass of ideal gas? (T is constant.) A B C D

pv

p

pv

p

pv

p

pv

p

The answer is C

2. The use of the Data Booklet is relevant in this question.The graph shows the first ionisation energy of five elements in order of increasing proton number.

IE

proton number

Which option correctly represents the identity of Elements 1, 2, 3, 4 and 5?

1 2 3 4 5A Ti V Cr Mn FeB Al Si P S ClC C N O F NeD P S Cl Ar K

4

1 3

2

5

2. The use of the Data Booklet is relevant in this question.The graph shows the first ionisation energy of five elements in order of increasing proton number.

IE

proton number

4

1 3

2

5

IE generally increases across the period.

2. The use of the Data Booklet is relevant in this question.The graph shows the first ionisation energy of five elements in order of increasing proton number.

IE

proton number

4

1 3

2

5

IE generally increases across the period.

The trend is not followed only at certain points

2. The use of the Data Booklet is relevant in this question.The graph shows the first ionisation energy of five elements in order of increasing proton number.

IE

proton number

4

1 3

2

5

IE generally increases across the period.

The trend is not followed only at certain points

Element 5 does not follow the trend and is a lot lower than the rest of the elements.

2. The use of the Data Booklet is relevant in this question.The graph shows the first ionisation energy of five elements in order of increasing proton number.

IE

proton number

4

1 3

2

5

IE generally increases across the period.

The trend is not followed only at certain points

Element 5 does not follow the trend and is a lot lower than the rest of the elements.

Element 5 is an element that belongs to a quantum level that is further away.

2. The use of the Data Booklet is relevant in this question.The graph shows the first ionisation energy of five elements in order of increasing proton number.

IE

proton number

Which option correctly represents the identity of Elements 1, 2, 3, 4 and 5?

1 2 3 4 5A Ti V Cr Mn FeB Al Si P S ClC C N O F NeD P S Cl Ar K

4

1 3

2

5

2. The use of the Data Booklet is relevant in this question.The graph shows the first ionisation energy of five elements in order of increasing proton number.

IE

proton number

Which option correctly represents the identity of Elements 1, 2, 3, 4 and 5?

1 2 3 4 5A Ti V Cr Mn FeB Al Si P S ClC C N O F NeD P S Cl Ar K

4

1 3

2

5

2. The use of the Data Booklet is relevant in this question.The graph shows the first ionisation energy of five elements in order of increasing proton number.

IE

proton number

Which option correctly represents the identity of Elements 1, 2, 3, 4 and 5?

1 2 3 4 5A Ti V Cr Mn FeB Al Si P S ClC C N O F NeD P S Cl Ar K

4

1 3

2

5

3. An ideal gas exerts a pressure of 60 Pa when its temperature is 400 K and the concentration of the gas is k. Another sample of the same gas exerts a pressure of 30 Pa when its temperature is 300 K. How many molecules are present in unit volume of this second sample?

3

4k

2

3k

4

3k

3

2kA B C D

3. An ideal gas exerts a pressure of 60 Pa when its temperature is 400 K and the concentration of the gas is k. Another sample of the same gas exerts a pressure of 30 Pa when its temperature is 300 K. How many molecules are present in unit volume of this second sample?

p V = n R T

3. An ideal gas exerts a pressure of 60 Pa when its temperature is 400 K and the concentration of the gas is k. Another sample of the same gas exerts a pressure of 30 Pa when its temperature is 300 K. How many molecules are present in unit volume of this second sample?

p V = n R T

Concentration of gas??

3. An ideal gas exerts a pressure of 60 Pa when its temperature is 400 K and the concentration of the gas is k. Another sample of the same gas exerts a pressure of 30 Pa when its temperature is 300 K. How many molecules are present in unit volume of this second sample?

p V = n R T

Concentration of gas??

= concentration of gasV

n

3. An ideal gas exerts a pressure of 60 Pa when its temperature is 400 K and the concentration of the gas is k. Another sample of the same gas exerts a pressure of 30 Pa when its temperature is 300 K. How many molecules are present in unit volume of this second sample?

p V = n R T

Concentration of gas??

= concentration of gas

=

V

n

RT

p

V

n

3. An ideal gas exerts a pressure of 60 Pa when its temperature is 400 K and the concentration of the gas is k. Another sample of the same gas exerts a pressure of 30 Pa when its temperature is 300 K. How many molecules are present in unit volume of this second sample?

p V = n R T

Concentration of gas??

= concentration of gas

=

=

k =

V

n

RT

p

V

n

R400

60

R20

3

3. An ideal gas exerts a pressure of 60 Pa when its temperature is 400 K and the concentration of the gas is k. Another sample of the same gas exerts a pressure of 30 Pa when its temperature is 300 K. How many molecules are present in unit volume of this second sample?

p V = n R T

Concentration of gas??

= concentration of gas

=

=

k =

V

n

RT

p

V

n

R400

60

R20

3

R remains constant in both cases

3. An ideal gas exerts a pressure of 60 Pa when its temperature is 400 K and the concentration of the gas is k. Another sample of the same gas exerts a pressure of 30 Pa when its temperature is 300 K. How many molecules are present in unit volume of this second sample?

R =k20

3

3. An ideal gas exerts a pressure of 60 Pa when its temperature is 400 K and the concentration of the gas is k. Another sample of the same gas exerts a pressure of 30 Pa when its temperature is 300 K. How many molecules are present in unit volume of this second sample?

R =

In the second scenario

30 V = n R (300)

k20

3

3. An ideal gas exerts a pressure of 60 Pa when its temperature is 400 K and the concentration of the gas is k. Another sample of the same gas exerts a pressure of 30 Pa when its temperature is 300 K. How many molecules are present in unit volume of this second sample?

R =

In the second scenario

30 V = n R (300)

=

k20

3

V

n

R300

30

3. An ideal gas exerts a pressure of 60 Pa when its temperature is 400 K and the concentration of the gas is k. Another sample of the same gas exerts a pressure of 30 Pa when its temperature is 300 K. How many molecules are present in unit volume of this second sample?

R =

In the second scenario

30 V = n R (300)

=

=

k20

3

V

n

R300

30

10

1

3

20k

3. An ideal gas exerts a pressure of 60 Pa when its temperature is 400 K and the concentration of the gas is k. Another sample of the same gas exerts a pressure of 30 Pa when its temperature is 300 K. How many molecules are present in unit volume of this second sample?

R =

In the second scenario

30 V = n R (300)

=

=

=

k20

3

V

n

R300

30

10

1

3

20k

3

2k

3. An ideal gas exerts a pressure of 60 Pa when its temperature is 400 K and the concentration of the gas is k. Another sample of the same gas exerts a pressure of 30 Pa when its temperature is 300 K. How many molecules are present in unit volume of this second sample?

3

4k

2

3k

4

3k

3

2kA B C D

3. An ideal gas exerts a pressure of 60 Pa when its temperature is 400 K and the concentration of the gas is k. Another sample of the same gas exerts a pressure of 30 Pa when its temperature is 300 K. How many molecules are present in unit volume of this second sample?

3

4k

2

3k

4

3k

3

2kA B C D

5. The following ideas were those underlying John Dalton’s atomic theory, published in 1803.

Which idea is known to be correct?

A Atoms are indivisible.B Atoms are very small.C Atoms of an element are identical.D Atoms of one element always differ in mass from those

or another element.

5. The following ideas were those underlying John Dalton’s atomic theory, published in 1803.

Which idea is known to be correct?

A Atoms are indivisible.B Atoms are very small.C Atoms of an element are identical.D Atoms of one element always differ in mass from those

or another element.

5. The following ideas were those underlying John Dalton’s atomic theory, published in 1803.

Which idea is known to be correct?

A Atoms are indivisible.B Atoms are very small.C Atoms of an element are identical.D Atoms of one element always differ in mass from those

or another element.

5. The following ideas were those underlying John Dalton’s atomic theory, published in 1803.

Which idea is known to be correct?

A Atoms are indivisible.B Atoms are very small.C Atoms of an element are identical.D Atoms of one element always differ in mass from those

or another element.

5. The following ideas were those underlying John Dalton’s atomic theory, published in 1803.

Which idea is known to be correct?

A Atoms are indivisible.B Atoms are very small.C Atoms of an element are identical.D Atoms of one element always differ in mass from those

or another element.

5. The following ideas were those underlying John Dalton’s atomic theory, published in 1803.

Which idea is known to be correct?

A Atoms are indivisible.B Atoms are very small.C Atoms of an element are identical.D Atoms of one element always differ in mass from those

or another element.

40Ar 40Ca

5. The following ideas were those underlying John Dalton’s atomic theory, published in 1803.

Which idea is known to be correct?

A Atoms are indivisible.B Atoms are very small.C Atoms of an element are identical.D Atoms of one element always differ in mass from those

or another element.

5. The following ideas were those underlying John Dalton’s atomic theory, published in 1803.

Which idea is known to be correct?

A Atoms are indivisible.B Atoms are very small.C Atoms of an element are identical.D Atoms of one element always differ in mass from those

or another element.