WorksheetsBasic Chemistry Test
Total questions: 40
Worksheet time: 22mins
Atom P
Proton No: 6
Nucleon No: 14
What is the number of neutrons in atom P?
6
7
8
12
How many atoms are there in 2 mol of chlorine gas?
[Avogardo constant: 6.02 x 1023 mol-1]
1.204 x 1024
2.408 x 1024
3.612 x 1024
4.816 x 1024
Calculate the relative formula mass of Zn(NO3)2.
[Relative atomic mass: Zn=65, N=14, O=16]
127
175
189
254
What is the emperical formula for this oxide?
JO
J2O
J2O3
J3O2
Limewater turns milky and a black solid is formed. Which of the following equations correctly represent the reaction?
Cu2CO3 ---> Cu2O + CO2
CuCO3 ---> CuO + CO2
CuCO3 ---> CuO2 + CO2
CuCO2 ---> Cu + CO2
Which of the following statements explain why the melting point and boiling point of Group 1 element decreases when going down the group in the periodic table?
The number of proton increase.
Size of atom increases.
The relative mass of atom increases.
The number of valence electron increases.
The electron arrangement of atom J is 2.8.2 and the electron arrangement of atom L is 2.7. Element J and L react to form a compound. Which of the following is true about the reaction?
Atom L donates 7 electrons
Atom J receive 1 electron
An ionic compound is formed
The ionic compound formed has the chemical formula J2L.
20.0cm3 of 0.4 mol dm-3 sodium hydroxide is titrated with sulphuric acid. What is the volume of 1.0 mol dm-3 sulphuric acid needed to neutralise the sodium hydroxide solution?
4.0cm3
8.0cm3
10.0cm3
12.0cm3
The reaction between hydrochloric acid and calcium carbonate produces carbon dioxide gas. The reaction is complete in 50 seconds and the maximum volume of gas produced is 25cm3. What is the average rate of reaction?
0.5 cm3 s-1
1.0 cm3 s-1
2.0 cm3 s-1
4.0 cm3 s-1
Element M is placed in Group 14 and Period 3 of the Periodic Table. What is the electron arrangement of an atom M?
2.3
2.4
2.8.3
2.8.4
An atom Y with nucleon number of 23 has 12 neutrons. Which element has the same chemical properties as element Y?
[Proton number: B = 5, Mg = 12, Cl = 17, K = 19]
Boron
Magnesium
Chlorine
Potassium
Pick two correct properties of Group 17 elements
Boiling point decreases down the group
Reactivity decreases down the group
Electronegativity increases down the group
Form diatomic molecules
The proton number of atom R is 14 and its relative atomic mass is 28. Which statements is correct about R?
The mass of 1 atom R is 28g
The molar mass of R is 28g mol−1
14g of R contains 6.0 x 1023 atoms
Atom R has 14 protons, 14 electrons and 28 neutrons
Which of the following is true about weak acid?
Unable to neutralize alkali
The pH value is more than 7
Able to change red litmus paper to blue
Ionizes partially in water to produce hydrogen ions
Which of the following is true of an exothermic reaction?
The container becomes hotter.
The temperature of the mixture decreases.
Heat energy is absorbed from the surroundings.
The heat energy is converted to kinetic energy.
A balloon contains 12.04 x 1023 of gas particle. What is the number of moles of the gas in the balloon? [Avogadro's constant : 6.02 x 1023 mol-1]
0.5 mol
1.0 mol
2.0 mol
6.0 mol
Table 3 shows the electron arrangement of elements P, Q, R and S. Which of the following pairs will form an ionic compound?
Q and P
S and Q
R and P
Q and P
Ionic equation for the reaction between zinc and copper(II) ions solution, Cu2+ is shown below.
Zn + Cu2+ --> Zn2+ + Cu
Based on the equation, which substance undergoes oxidation?
Zn
Cu2+
Zn2+
Cu
Diagram 5 shows the energy level diagram for the precipitation reaction of silver chloride. Which of the following is true about the reaction?
Endothermic reaction, heat is released.
Exothermic reaction, heat is absorbed.
Endothermic reaction, heat is absorbed.
Exothermic reaction, heat is released.
Diagram shows the electron arrangement of a carbon dioxide molecule. Which of the following is true?
One carbon atom contributes four electrons to be shared by two oxygen atoms.
Four double covalent bonds are formed in a carbon dioxide molecule.
Each oxygen atom contributes one electron for sharing.
One carbon atom requires two electrons to achieve the octet electron arrangement.
When but-1-ene is shaken with bromine water, the brown bromine water is decolourised. What is the product of this reaction?
1,2-dibromobutane
2,3-dibromobutene
1,2-dibromobutene
2,3-dibromobutane
The electron arrangement of atom X is 2.8.5 and atom Y has 2 valence electrons. What is the type of bond and formula of compound formed between X and Y?
A
B
C
D
The reaction between nitric acid and magnesium is complete in 2 minutes and 5 seconds. Maximum volume of gas hydrogen produce is 50cm3. What is the average rate of reaction?
0.4 cm3s-1
2.0 cm3s-1
2.5 cm3s-1
10.0 cm3s-1
The reaction between 50cm3 0.1mol dm-3 sodium iodide solution and 50cm3 0.1mol dm-3 lead(II) nitrate solution releases 4200J of heat. What is the change in temperature of the mixture?
[Specific heat capacity of solution = 4.2 J g-1 C-1. Density of solution = 1g cm-3]
2.1 C
8.4 C
10.0 C
20.0 C
Which statement defines oxidation?
Gain of electron
Gain of hydrogen
Loss of oxygen
Increase in oxidation number
Which of the following is an electrolyte?
Glucose
Naphthalene
Sodium chloride solution
Glacial ethanoic acid
Diagram shows the set-up of apparatus used to purify impure copper metal.
What would be observed after 30 minutes?
Impurities settle to the bottom of the beaker below the anode
The intensity of the blue colour of copper (II) sulphate solution decreases
The pure copper cathode becomes thinner
The impure copper anode becomes thicker
A thermochemical equation is given as below
Zn + CuSO4 --> ZnSO4 + Cu; ΔH = - 210 kJ mol-1
What is the temperature increases if 50 cm3 of 0.2 mol dm-3 of copper (II) sulphate solution is added with excess zinc?
[ c = 4.2 J g-1 oC-1 ; Density of solution = 1 g cm-3 ]
0.01oC
10.5oC
10oC
200oC
Which factor does not affect the discharge of ions at electrodes during electrolysis of an aqueous solution?
Position of ions in the electrochemical series
Concentration of ions in the electrolyte
Volume of electrolyte
Types of electrodes
Diagram shows the rusting process of iron.
Which of the following equations occurs at the cathode?
Fe -- > Fe2+ + 2e-
Fe2+ + 2e- -- > Fe
O2 + 2H2O + 4e- -- > 4OH-
4OH- -- > O2 + 2H2O + 4e-
What are valence electrons?
sum of the protons and neutrons
protons minus electrons
electrons in the inner shells
electrons in the outer shell
Atoms that gain an electron have an electric charge of ---
-1.
-2.
+1.
+2.
If an atom has 7 protons and 7 electrons, its electric charge is ---
-7
-14
0
+7
Which of the following is NOT an ionic bond?
NH3
KCl
K3N
NaCl
which element, if any, is oxidized?
What is the empirical formula for the compound?
CH2O
C2H2O2
CH2O2
C2H5O2
Diagram shows the percentage composition of a dye. What is the molecular formula of the dye? [Relative atomic mass: C = 12, H = 1, N = 14, Molar mass of the dye= 237 g mol-1]
Rajah menunjukkan peratus komposisi bagi sesuatu pewarna. Apakah formula molekul bagi pewarna itu?
CHN5
C5H5N
C3H3N15
C15H15N3
A sample of carbon dioxide has a mass of 88 g. The relative molecular mass of the gas is 44. Which statements are correct about the sample of carbon dioxide?
Suatu sampel karbon dioksida mempunyai jisim 88 g. Jisim
molekul relatif bagi bagi gas ialah 44. Antara pernyataan berikut, yang manakah benar mengenai sampel karbon dioksida tersebut?
It contains 2 moles of carbon dioxide molecules
Mengandungi 2 mol molekul karbon dioksida
It contains 2 moles of carbon atoms
Mengandungi 2 mol atom karbon
It contains 2 moles of oxygen atoms
Mengandungi 2 mol atom oksigen
It contains 2 x 6 x 1023 carbon dioxide molecules
Mengandungi 2 x 6 x 1023 molekul karbon dioksida
