PERIODIC TABLE

Question 1

Which of these properties of iron is a chemical property? Tick one box.
A) iron melts at a temperature of 1538 °C

B) iron has a density of 7.874 g/cm3 at room temperature

C) iron rusts to form iron oxide when oxygen and water are present

D) iron conducts heat well

Answer 1

C) iron rusts to form iron oxide when oxygen and water are present

Question 2

How many atoms are there in total in a molecule of ammonia (NH3)?
A) 1
B) 2
C) 3
D) 4

Answer 2

D) 4

Question 3

Use these words to complete the text.

atoms chemical compound melting

Dalton’s atomic model states that each element has particular physical properties because it
contains its own type of ________. For example, pure copper has a_________
point of 1083 °C.
The atoms in different elements may be rearranged to form a_________
during a _________reaction.

Answer 3

Dalton’s atomic model states that each element has particular physical properties because it
contains its own type of atom. For example, pure copper has melting
point of 1083 °C.
The atoms in different elements may be rearranged to form a_compound_
during a _chemical_reaction.

Question 4

Copper oxide is formed from one atom of copper and one atom of oxygen. What is the
chemical formula for copper oxide?
A) Cu
B) CuO
C) Cu2O
D) CuO2

Answer 4

B) CuO

Question 5

Complete the word equation for the following reaction.
copper + chlorine = _______________

Answer 5

copper + chlorine = copper_chloride

Question 6

what would a diagram of a methane molecule look like which has the formula of CH4

Answer 6

The carbon atom is placed in the center.
The four hydrogen atoms are placed on the top bottom right and left symmetrically around the carbon atom.
Each hydrogen atom is connected to the carbon atom by a single bond

Question 7

International symbols are used to represent elements.
(a) Name the element with the symbol N.

(b) Give the symbol for the element chlorine.

Answer 7

a) Nitrogen

b) Cl

Question 8

Give one reason why it is helpful to use international symbols for elements.

Answer 8

International symbols makes it easier for people worldwide to understand what you are talking about even if you do not speak the same language as them

Question 9

Name the compound formed when magnesium burns in air.

Answer 9

Magnesium oxide

Question 10

A class is asked to measure the increase in mass when a
1 g piece of magnesium is burned in air using the apparatus
in the diagram.
Class results
Group Increase in mass (g)
1 0.19
2 0.22
3 0.23
4 0.22
5 0.02
6 0.24
witch one is the anomalous result in the results table
give one reason for your answer

and then Calculate the mean average of the increase in mass in grams for this set of results. Clearly explain what
you do with any anomalous results.

Give one reason for the increase in mass

Answer 10

Group 5 is most likely to be anomalous because its result (0.02g) is much lower than the others so it is most likely to be an error

ignore the anomalous result (Group 5).
(Add the results of each other group together) 0.19 + 0.22 + 0.23 + 0.22 + 0.24 = 1.1 g
Then, divide by 5 (number of valid results):
Mean = 1.1 ÷ 5 = 0.22 g

the magnesium reacts with oxygen in the air to form magnesium oxide, which adds to the total mass.

Question 11

Give the symbols for two examples of halogens from the table.

Answer 11

Chlorine = Cl
Iodine = I

Question 12

Give one reason why Mendeleev arranged the elements in groups.

Answer 12

Mendeleev arranged elements in groups to highlight patterns in their properties, making the table easier to understand.

Question 13

State the name given to the set of elements in one row of the table.

Answer 13

Period

Question 14

___ ___
L_L_ __________L_I
L_L_I L_LiLiiL_L_L_I
IiiiIivI____________________ L_L_L_L_L_LviI
L_LvL_L_L_L_L_L_L_L_L_L_L_L_L_L_L_L_I
L_L_L_L_L_L_L_L_L_L_L_L_L_L_L_L_L_L_I
L_L_L_L_L_L_L_L_L_L_L_L_L_L_L_L_L_L_I

Which of the elements shown in the periodic table are non-metals? Tick one box.
A (i) and (ii)
B (iii), (iv) and (vi)
C (iii), (iv) and (v)
D (i), (ii) and (vi)

Which element is an alkali metal? Tick one box.
A (i)
B (ii)
C (iii)
D (vi)

State which of elements (iv) and (v) in the table is the more reactive. Give one reason for

Answer 14

C (iii), (iv) and (v)

C (iii)

(V) because as you go down group 2 in the periodic table the larger the atomic size the element would have causing it to be more reactive

Question 15

Which gas is formed when sodium metal reacts with water? Tick one box.
A hydrogen
B nitrogen
C oxygen
D carbon dioxide

Answer 15

A hydrogen

Question 16

Complete the word equation for this reaction.
zinc oxide + hydrochloric acid = __________

Zinc oxide is a base. Name the general type of reaction described by the word equation in the last question

Describe how you would identify the pH of a solution of magnesium oxide dissolved in
water.

Answer 16

zinc oxide + hydrochloric acid = Zinc_chloride+Water

Neutralization

Using a universal indicator to measure the acidity or alkalinity of the solution

Question 17

A table records the temperatures change of Metal X melting on the tables the temp line goes up and then it stays level at 80 degrees celcius for a while and then rises up again

Give the melting point of metal X in the correct unit

Give one reason why the temperature of the metal stays the same when it is melting

Answer 17

80 degrees celcius

The temperature stays the same because the energy is being used to break the bonds between particles, not to increase the temperature