Co-Ordinated Sciences Paper 1
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Transcript of Co-Ordinated Sciences Paper 1
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1The element phosphorus burns in air and it forms a substance with the formula P4O10. What does the formula P4O10.Aa mixture of atoms of two elements
Ba mixture of molecules of two elements
Ca molecule of a compound
Dan atom of a compound
2What types of oxide are formed by magnesium and sulfur?
magnesiumsulfur
Aacidicacidic
Bacidicbasic
Cbasicacidic
Dbasicbasic
3An alloy is used for making an aircraft body.Which properties does this alloy need to have?
low densityhigh electrical conditivity
Anono
Bnoyes
Cyesno
Dyesyes
4What do the chemical symbols, N2 and Ni represent?N2Ni
Aa compounda compound
Ba compoundan element
Can elementa compound
Dan elementan element
5The metal titanium occurs naturally combined with oxygen.The table shows the combining powers of the elements in the compound.
elementsymbolcombining power
oxygenO2
titaniumTi4
What could be the formula of the compound?ATiO2BTi2OCTiO4DTi4O2
10When water is heated to 100C, it changes to steam.The steam has a larger volume than the water.Which change on heating probably explains this increase in volume?massnumber of electrons
A
B
C
D
11A Geiger counter detects radiation from radioactive sources.A radioactive source is inside a thick aluminium container as shown.
Aalpha-particles
Bbeta-particles
Cgamma-rays
Dradio waves
12An element X has a high melting point and its oxide, X2O3, is coloured.How are X and X2O3 described?XX2O3
Atransition metalacidic
Btransition metalbasic
Cnon-metalacidic
Dnon-metalbasic
13A measuring cylinder contains some water. When a stone is put in the water, the level rises.What is the volume of the stone?
A50cm3B70cm3C75cm3D125cm3
14The table shows the name and formula of four metal ores.Which of the following contain only 3 elements?nameformula
1chalcopyriteCuFeS2
2ilmeniteFeTiO3
3malachiteCu2CO3(OH)2
4wolframiteFeWO4
A1 and 3 only
B2 and 4 only
C1, 2 and 4 only
D2, 3 and 4 only
15The diagram shows a sack containing a mixture of three minerals.
Which element is not present in the mixture?Acobalt
Bcopper
Ciron
Dtin
16Which type of radiation can be stopped by a sheet of paper?
A-particles
B-particles
C-rays
DX-rays
17Samples of four different materials (A, B, C and D) are tested in the experiments shown.
The results are given in the table below for A, B, C and D respectively.Which material is a metal?materialexperiment 1experiment 2
Alamp does not lightbends
Blamp does not lightbreaks
Clamp lightsbends
Dlamp lightsbreaks
18Element X can form 4 covalent bonds. Element Y can form 2 covalent bonds.What is the simplest formula of the compound formed by X and Y?
AXY2
BX2Y
CX2Y4
DX4Y2
19Name the compound with the formula CO.ACarbon oxide
BCarbon dioxide
CCarbon oxygen
DCarbon monoxide
20Construct the chemical formula of the ionic compound formed by the following ions.Na+CO3 2-
ANa2CO3
BNa3CO3
CNa(CO3)2
DNaCO3
21Construct the chemical formula of the ionic compound formed by the following ions.Ca2+OH-ACa2OH
BCa2(OH)2
CCa(OH)2
DCa(OH)
22The chemical formulae of a chemical substance showsIthe types of atoms present in the substance
IIthe number of each type of atoms present in a molecule of the substance
IIIthe symbol of the elements in the substance
IVthe relative mass of the substance
AI and II
BII and III
CI, II, and III
DI, II, III and IV
23The chemical formula of water is H2O. what does the formula tell you about water?Iit is made up of hydrogen and oxygen atoms
IIthere are three atoms in a molecule of water
IIIthe ratio of hydrogen to oxygen is 2 : 1
IVtwo atoms of oxygen combine with one atom of hydrogen to form water
AI and II
BII and III
CI, II, and III
DI, II, III and IV
24The chemical formula for an acid that contains 2 carbon atoms, 4 hydrogen atoms and two oxygen atoms. Which could be a possible chemical formula of the acid?ACH3COOH
BC2HCOOH
CCH2COOH
DCHCOO
25Which of the following statements are true about the kinetic theory of matter?Iparticles are always moving or vibrating
IIthe speed of particles will be greater if more energy is added
IIIthe particles in liquid move faster than the particles in gas
IVthe movement of particles in liquid is mainly vibration
AI and II
BIII and IV
CI, II, and III
DI, II, III and IV
26A beaker of water soon becomes blue if a piece of blue copper (II) sulphate crystal is placed in it. This happens because
Awater dissolves copper (II) sulphate
Bcopper (II) sulphate is a conductor of electricity
Ccopper (II) sulphate is made up of minute and discrete particles
Dthe attractive force between water and copper (II) sulphate is strong
27Which of the following set up of apparatus is correct to determine the freezing point of a substance?
28The diagram shows a gas jar placed upside down on top of another gas jar containing a few drops of liquid bromine.
Brown bromine vapour was observed in both the gas jars after a few minutes. Which of the following statements best explains the observation?ABromine vaporises easily
BAir is heavier than bromine
CBromine consists of particles that are in constant motion
DBromine particles have a higher kinetic energy than air particles
29The rate of diffusion of particles is the highest in gases compared to the rate of diffusion of particles in solids and liquids because the particles in gasesAare lighter
Bare smaller
Care very far apart
Dmove at a higher speed
30Which of the following processes involves the liberation of heat energy?IFreezing
IISublimation
IIICondensation
IVEvaporation
AI and II
BII and IV
CI, II and III
DI, II, III and IV
31Which of the following processes involves the absorption of heat energy?IMelting
IISublimation
IIIBoiling
IVEvaporation
AI and II
BII and IV
CI, II and III
DI, II, III and IV
32The table shows the melting point and boiling point of two substances, X and Y.SubstancesMelting point (C)Boiling point (C)
X580
Y-130-70
Which of the following shows correctly the state of substances X and Y at room temperature?XY
ALiquidLiquid
BLiquidGas
CGasGas
DSolidGas
33Substance P exists as a liquid at a temperature of 70C. Which of the following could be the melting point and boiling point of substance P?
Melting point (C)Boiling point (C)
A80190
B75145
C-2010
D-50135
34Which of the following happens during the heating of a substance?IThe kinetic energy of its particles increases
IIThe distance between its particles increases
IIIThe forces of attraction between its particles become weaker
IVThe size of its particles increases
AI and II
BII and IV
CI, II and III
DI, II, III and IV
35Which of the following happens during the cooling of a substance?IThe kinetic energy of its particles decreases
IIThe distance between its particles decreases
IIIThe forces of attraction between its particles become stronger
IVThe size of its particles decreases
AI and II
BII and IV
CI, II and III
DI, II, III and IV
36Which of the following graphs represents the heating curve of a substance when its powder is heated till it has melted?
37Questions 37 to 39 are based on the diagram.The diagram shows the cooling curve of hot liquid naphthalene.
At which point on the curve does liquid naphthalene begin to solidify?AP
BQ
CR
DS
38At which region on the curve does naphthalene consist of a mixture of liquid and solid?APQ
BQR
CRS
DQS
39Why does the temperature remain constant at the region QR on the cooling curve?AHeat is released as the particles become smaller in size as they cool
BHeat energy us absorbed by the particles as they attract each other to form a solid
CHeat energy is reabsorbed from the surroundings by the particles to balance the heat loss to the surroundings
DHeat loss to the surroundings is exactly balanced by the heat energy released as the particles attract each other to form a solid
40In an experiment, substance X, in the solid state, is heated until it has melted completely. The liquid is then allowed to cool to room temperature. The diagram shows the graph of temperature against time for the experiment.
Which part of the graph shows that the process of melting is taking place?
AP
BQ
CR
DS