The diagram represents the structure of a lithium atom. Which particle is represented by the circle with the cross inside?
electron
neutron
nucleus
proton
Three minerals containing iron are listed. What is the total number of different elements contained in all three minerals?
3
4
5
16
The diagram shows part of the Periodic Table. Which letter shows the position of a metal with a low melting point?
A
B
C
D
Which row describes the general properties of non-metals?
Which statement is not a reason why aluminium is used in aircraft manufacture?
It forms low density alloys.
It is malleable.
It is more reactive than iron.
It is resistant to corrosion.
What are the chemical elements found in carbohydrates?
carbon, hydrogen and oxygen only
carbon, hydrogen, oxygen and nitrogen only
carbon, hydrogen, oxygen and sulfur only
carbon, hydrogen, oxygen, nitrogen and sulfur only
The structures of some substances are shown. Which row shows the total number of different elements and the total number of atoms in the three structures?
The diagram shows a helium atom. Which particles in the helium atom have approximately the same mass?
electron and proton only
electron and neutron only
proton and neutron only
electron, proton and neutron
Which changes are chemical changes? 1 conversion of steam to liquid water 2 cracking of alkanes 3 fractional distillation of petroleum 4 strongly heating calcium carbonate
1 and 3
1 and 4
2 and 3
2 and 4
When two oxygen atoms bond, the atoms share transfer delocalise( share, transfer, delocalise ) electrons. The oxygen atoms are joined by ionic covalent metallic( ionic, covalent, metallic ) bonds. Oxygen is made of a giant lattice macromolecules simple molecules( a giant lattice, macromolecules, simple molecules ).
When hydrogen peroxide decomposes water is produced. Which two statements explain why water is a liquid at room temperature?
Water has a boiling point of 100 °C.
Water is made of ions.
Water has a melting point lower than room temperature.
Water has a giant covalent structure.
An atom of gold is represented as shown in the diagram. Complete the sentences. The atomic number of gold is . The number of electrons in an atom of gold is .
Diamond and graphite are macromolecules. Which statement about diamond and graphite is not correct?
They are giant structures with high melting points.
They are non-conductors of electricity.
They contain only atoms of a non-metal.
They have covalent bonds between the atoms.
An aluminium atom has a nucleon number of 27 and a proton number of 13. How many neutrons does this aluminium atom contain?
13
14
27
40
What happens when a bond is formed between a green gaseous element and a soft metallic element?
The gas atoms gain an electron.
The gas atoms lose an electron.
The metal atoms gain an electron.
The two elements share a pair of electrons.
The equation shows the reaction between magnesium and sulfuric acid. [Ar: H, 1; O, 16; Mg, 24; S, 32] Mg + H2SO4 → MgSO4 + H2 In this reaction, which mass of magnesium sulfate is formed when 6g of magnesium react with excess sulfuric acid?
8
24
30
60
Some properties of four elements, P, Q, R and S, are shown in the table. Two of these elements are in Group I of the Periodic Table and two are in Group VII. Which statement is correct?
P is below R in Group I.
Q is above R in Group I.
Q is below S in Group VII.
R is below S in Group VII.
Two statements about argon are given. 1 Argon has a full outer shell of electrons. 2 Argon is very reactive and is used in lamps. Which is correct?
Both statements are correct and statement 2 explains statement 1.
Both statements are correct but statement 2 does not explain statement 1.
Statement 1 is correct but statement 2 is incorrect.
Statement 2 is correct but statement 1 is incorrect.
Which statement about the uses of metals is correct?
Aluminium is used in the manufacture of aircraft because of its strength and high density.
Copper is used in electrical wiring because of its strength and high density.
Mild steel is used in the manufacture of car bodies because of its strength and resistance to corrosion.
Stainless steel is used in the construction of chemical plant because of its strength and resistance to corrosion.
One of the instructions for an experiment reads as follows. Quickly add 50 cm3 of acid. What is the best piece of apparatus to use?
a burette
a conical flask
a measuring cylinder
a pipette
Two statements about diamond are given. 1 Diamond has a giant three-dimensional covalent structure of carbon atoms. 2 Diamond is one of the hardest substances known. Which is correct?
Both statements are correct and statement 1 explains statement 2.
The table shows the electronic structure of four atoms. Which two atoms combine to form a covalent compound?
W and X
W and Y
X and Y
X and Z
An atom of element Q contains 19 electrons, 19 protons and 20 neutrons. What is Q?
calcium
potassium
strontium
yttrium
Lithium is in Group I of the Periodic Table. Nitrogen is in Group V of the Periodic Table. Lithium reacts with nitrogen to form the ionic compound lithium nitride. What happens to the electrons when lithium atoms and nitrogen atoms form ions?
Bitte warte - es wird geladen…