atomic structure multiple choice

Question 1

A student has a 10 cm3 sample of 1.00 × 10–2 mol dm–3 methanoic acid solution.
The student is asked to dilute the methanoic acid solution to a concentration of
2.00 × 10–4 mol dm–3 by adding distilled water.
Which volume of water should be added?

Answer 1

concentration = moles/volume

conc x volume

10cm(3)/1000=0.01

1x10(2)x0.01= 0.0001

moles/concentration

0.0001/ 2x10(4)

490cm3 needed

Question 2

Which shows the electron configuration of an atom of a transition metal?

Question 3

Q12.
In the early twentieth century the apparatus shown in the diagram was used to
investigate atomic structure. When He2+ particles were fired at a thin sheet of
gold, most of the particles were detected at point P.(straight through gold sheet)

What conclusion can be drawn from the detection of He2+ particles at point P?

Question 4

Q13.
When He2+ particles were fired at a thin sheet of gold, about 1 in 8000 of the
particles were detected at point Q.
What conclusion can be drawn from the detection of He2+ particles at point Q

deflected backwards

Question 5

Chlorine exists as two isotopes 35Cl and 37Cl in the ratio 3:1
Which statement about peaks in the mass spectrum of Cl2 is correct?

Question 6

Element Q forms a sulfate with formula QSO4
Which of these could represent the electronic configuration of an atom of Q?

Question 7

Q19.
Bromine exists as two isotopes 79Br and 81Br, which are found in almost equal
abundance.
Which of the statements is correct?

Question 8

Which species has the same number of electrons as the radical *CH3?