Elements of Life - review of the first half-term

Question 1

What is the shape of a molecule of H2S, and what is the H-S-H bond angle?

Accepted Answer

Bent (V-shaped), a few degrees below 109.5°

Question 2

An alkali is...

Accepted Answer

...base that dissolves in water to produce hydroxide ions.

Question 3

What is the relative atomic mass of this element, given its mass spectrum?

Accepted Answer

35.5

Question 4

How much energy does a photon of electromagnetic radiation with a wavelength of 400 nm have?

Accepted Answer

4.97 x 10-19 J

Question 5

The flame colours of Li+, Na+, K+, Ca2+ and Ba2+ are which of the following?

Accepted Answer

Bright red, yellow, lilac, brick red and apple green.

Question 6

'Sets of coloured lines on a dark background that converge at higher wavelengths', describes...

Accepted Answer

None of these

Question 7

Infrared, visible, ultraviolet - these electromagnetic radiations are in order of...

Accepted Answer

increasing freq., decreasing wavelength, increasing energy.

Question 8

What was the key conclusion from the Geiger-Marsden (Rutherford) gold foil experiment?

Accepted Answer

The mass of the atom is concentrated in a central nucleus.

Question 9

What is the shape of a carbonate (CO32-) ion?

Accepted Answer

Trigonal planar

Question 10

How many lone pairs does sulfur have in a molecule of hydrogen sulfide (H2S)? (dot-and-cross..)

Accepted Answer

2

Question 11

The melting and boiling points of the period 2 elements change in which way from left to right?

Accepted Answer

Initially rise and then fall dramatically.

Question 12

In a fusion reaction, lighter nuclei join to form heavier nuclei under what conditions?

Accepted Answer

High temperature and pressure

Question 13

In the fusion reaction between hydrogen-2 and hydrogen-3 nuclei, a neutron and what is formed?

Accepted Answer

A helium-4 nucleus

Question 14

In which Block of the Periodic Table is an element with the electron configuration [Ar]3d54s2?

Accepted Answer

d-block

Question 15

Which type of atomic orbital is shown in the picture?

Accepted Answer

p-orbital

Question 16

Which of the following is a correctly written electron configuration for a phosphorus ion, P3-?

Accepted Answer

[Ne]3s23p6

Question 17

Ar= The ____ average mass of an atom of an element relative to __ the mass of one ___ of _____.

Accepted Answer

weighted, 1/12th, atom, carbon-12

Question 18

A substance has a low m.p. and does not conduct electricity. It has a...

Accepted Answer

Simple molecular structure

Questions 18