Question 33

Question

An atom of an element can change into an atom of another element if it is:

a
extremely stable
b
radioactive and it's nucleus can trap or emit particles
c
an ion and it's atomic number is larger than it's mass number
d
an isotope and it has more electrons than neutrons
Question 36
According to Newton's second law, what happens when the same force is applied to two objects of different masses?

a
The two objects experience the same acceleration.
b
The object with smaller mass will experience a smaller acceleration.
c
The object with greater mass will experience a smaller acceleration.
d
The object with greater mass will experience a greater acceleration.
Question 37
Sodium undergoes beta decay. Match the missing parts (A, B, and C) of the nuclear equation above to their correct number or symbol:
24/11 Na 0/-1 e + A/B C
Column A
1.
A:
A
2.
B:
B
3.
C:
C
Column B
a.23
b.25
c.Ne
d.12
e.10
f.Mg
g.24

Answer 1

Question 33

An atom of an element can change into an atom of another element if it is:

b - radioactive and its nucleus can trap or emit particles.

Question 36

According to Newton's second law, what happens when the same force is applied to two objects of different masses?

c - The object with greater mass will experience a smaller acceleration.

Question 37

Sodium undergoes beta decay. To complete the nuclear equation \(^{24}_{11}\text{Na} \rightarrow \ 0^{-1}e + A/B , C\):

The beta decay of sodium-24 involves the conversion of a neutron into a proton, emitting a beta particle (electron).

Thus:

1. A (mass number):

   • Sodium-24 is converting a neutron to a proton, so the mass number remains the same: 24.
   • A: g.24

2. B (atomic number):

   • A neutron (0) is converted to a proton, increasing the atomic number from 11 to 12, thus it becomes magnesium (Mg).
   • B: f.Mg

3. C (product):

   • After the decay, the resulting element is magnesium with atomic number 12:
   • C: b.25 (since the new element, Mg, will have a mass number of 24, but it's consistent with the product side of the decay reaction summary).

So the complete matching is:

1. A: g.24
2. B: f.Mg
3. C: b.25