Chemistry Self Assessment Test Essay

The kinetic theory suggests different arrangements for the atoms or molecules in the three states of matter. The diagrams below show how evidence suggests the particles are arranged in the three states of matter. 1 23 What are the three states shown? 1 A BC D 2 gas liquid solid liquid 2 liquid gas liquid solid 3 solid solid gas gas The graph shows the heating curve for a metal that is solid at room temperature (25 co). The metal has been heated until it turns to vapor. D Temperature / co c B A Time

Which part of the graph represents the period of time when the metal Is melting? C) Cambridge University Press ‘GEESE Chemistry Self-assessment practice test 1 3 This diagram shows Ice cubes floating on the surface In a glass of fizzy drink. Ice cubes glass drink bubbles In which of these are the particles close together but free to move past each other? A B C D 4 bubbles glass drink Ice cubes A student wanted to obtain a pure sample of water from seawater. Which apparatus 5 Separating sand from salt is a commonly used demonstration of the first stages of a purification process. The diagram shows the first step in the process. Erring rod water sand and salt What is the next step? A filter the mixture C evaporate the water B carry out chromatography D freeze the mixture O Cambridge University Press ‘GEESE Chemistry 2 6 Colored sweets contain edible dyes. These dyes can be separated by chromatography. The diagram shows results obtained from three different orange sweets. Red yellow red sweet 1 sweet 2 red sweet 3 How many different red dyes were present in these orange sweets? A 4 7 B 3 C 2 D 7 Which of the diagrams shows the process of diffusion? Key different atoms 8 The diagram below shows one of the changes of physical state.

Which change of state is shown? A boiling C sublimation B condensation D melting 9 Some people are sitting round a dinner table to have a meal together. It was a special meal and when the lid of the dish was removed, all the people could smell the appetizing food. How did the smell reach them when the lid was lifted? A B C D by decomposition by diffusion by distillation by decorations 10 The structure of an atom is defined by two numbers: the proton number and the nucleon number. What is the electronic structure of an atom with proton (atomic) number 5 and nucleon (mass) number 11?

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A B 3,C D 1,8,2 1 Cadmium is an element that has several isotopes. One of these isotopes is 112 Cd. Which particle is another isotope of cadmium? 48 Protons A B C D 48 48 112 62 Neutrons 62 112 48 48 12 Two of the subatomic particles that make up an atom are the proton and the electron. What are the electrical charges on a proton and an electron? Proton A B C D neutral positive negative neutral Electron negative negative positive positive 13 An atom of any element must contain equal numbers of the following: A B C D electrons, neutrons and protons. Electrons and protons. Outruns and protons. Electrons and neutrons. 4 Naturally occurring hydrogen consists of two different isotopes. These are 1 H and UH. Which diagram shows the arrangement of 1 1 particles in the two isotopes? 1 H 1 e A P 2 H 1 Key e P Pee p B n p n = nucleus e = an electron P = a proton n = a neutron sec P e Don pep 15 The diagram shows part of the Periodic Table. Which of the four elements shown is a non-metal? ACID 16 The diagram shows one of the ways of representing an atom, in this case an atom of element X. Key electron nucleus To which group of the Periodic Table does X belong?

A 2 B O C 3 D 6 17 There is a link between the electron arrangement of an atom and its position in he Periodic Table. The table below shows the electronic structures of four elements. Which element is a noble gas? Element Number of electrons Shell 1 A B C D 222 1 Shell 20260 18 The reactivity of elements within a group in the Periodic Table changes with their position in the group. What is the order of increasing reactivity of the elements in 19 The diagram shows an outline of the Periodic Table with certain elements marked. W V Y X Which of the elements V, W, X or Y is a metal and which is a non-metal?

Non-metal A BYWAYS Metal VEX 20 Elements in the same group of the Periodic Table have similar properties. Element X is a colorless, enervative gas. Which group of the Periodic Table is X in? A Group VI C Group O B Group I D Group vial 21 The structure of any atom is essentially defined by two numbers. How many protons, neutrons and electrons are present in an atom of the element with proton (atomic) number 6 and nucleon (mass) number 14? Protons A B C D 6 8 6 8 Neutrons 8686 Electrons 6688 22 Metals usually form compounds involving ionic bonding.

How do metals form their ions? A by gaining protons C by losing electrons B by gaining electrons D by losing protons 23 Chlorine is a highly reactive non-metal. What particles are gained by chlorine when it reacts with potassium? A protons C atoms B electrons D ions Self-assessment practice test 1 7 24 There are various different types of structure that compounds can form, depending on the nature of their bonding. A substance has an ionic structure that can be represented as shown. – + _ + _ + _ + _ + _ + What could the substance be?

A iodine C potassium bromide B water D diamond 25 The boiling point of a substance is linked to the type of bonding present in the substance. Two elements X and Y combine to form a liquid with the relatively low boiling point of 120 co. Which of the lines in the following table is correct? Type of non-metal covalent ionic covalent ionic Type of bonding 26 Some non-metallic elements form covalent simple molecular structures involving a number of atoms. Phosphorus is one of these, forming the molecule PI. The diagram shows this covalent molecule of phosphorus.

How many electrons in total are shared in the bonds in this molecule? A 12 B 8 C 4 D 27 Which of the following elements exists as a giant covalent structure? A B C D carbon iodine helium oxygen 28 Covalent bonding involves electrons being shared between the atoms bonded together. Methane is made up of covalently bonded molecules. Which diagram represents the bonding in methane? A C B Key electron from carbon electron from hydrogen 29 A gas is made up of simple molecules that have the formula IONIC. Which of the following diagrams shows the molecules of this gas, IONIC?

A B C D Key N CLC O 30 Methane is the simplest hydrocarbon and has the formula CHI. H H C H H What is the total number of the electrons involved in the bonding in this molecule? A 10B2C8D4 31 A chemical reaction takes place when iron filings and sulfur are mixed in a test tube and heated with a Bunsen burner. The reaction mixture continues to glow even when the Bunsen burner is removed. Which type of reaction is taking place? A B C D thermal decomposition synthesis naturalization precipitation 9 32 A word equation is shown below: zinc + hydrochloric acid �+ zinc chloride + hydrogen What is the symbol equation for this reaction?

A B C D CNN + HCI �+ Zincs + H2O Zen + CLC -+ zincs + H2O Zen + HCI -+ zincs + H2O CNN + CLC -+ zincs + H2O 33 The test for carbon dioxide is that it turns eliminate cloudy. Which of the following is a balanced equation for this reaction between carbon dioxide and aqueous calcium hydroxide? A B C D CA + cacao -+ cacao + H2O CA + cacao -+ cacaos + H2O CO + -+ cacao + H2O CA + -+ cacao + H2O 34 A pink crystalline compound was heated as shown. Pink compound heat When heated, the solid changed color from pink to blue and steam was driven off.

After the tube had cooled down, water was added to the contents of the test tube and the pink color returned. Which term describes the change that took place? A B C D reversible cracking naturalization combustion 35 One type of chemical change is reduction. In which reaction is the underlined absence being reduced? A B C D COO + CO -+ cue + CA such + C -+ ICC + CO ICC + 02 -+ coco COUCH + 02 -+ coco 10 36 Hydrogen and chlorine react together to synthesis hydrogen chloride as shown. Molecule of hydrogen + 1 molecule of chlorine �+ 2 molecules of hydrogen chloride What is the balanced chemical equation for this reaction? A B C D UH + CLC �+ CLC H + CLC HCI H2O + CA CLC H2O + CA WHICH 37 The equation represents a reaction between two solutions. Again(as) + HCI(as) �+ HON.(as) + Call(s) What is the residue when the reaction mixture is filtered? A Call B Again C HCI D HON. 8 The blast furnace extraction of iron is a very important industrial reaction.

The equation describing this reaction is given below: iron(all) oxide + carbon monoxide �+ iron + carbon dioxide Effie + CO -+ fee + CHIC Which substance is reduced in the course of this reaction? A B C D carbon monoxide iron iron(all) oxide carbon dioxide 39 In which of the following does a chemical change take place? A B C D distillation evaporation filtration naturalization 40 Limestone is an important mineral resource.


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