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WorksheetsChemistry EndTest Odd Semester_Grade 10_2022
Total questions: 25
Worksheet time: 18mins
Helium and neon only
Methane and oxygen only
Helium, methane and neon
Methane, oxygen and xenon
A
B
C
D
A
B
C
D
Liquid
Solid
Mixture of solid and liquid
Mixture of gas and liquid
Which of the following is correct about water particles during boiling ?
The size of the water particles increases
The movement of the water particles decreased
The water particles lose energy
The water particles gain energy
Benzoic acid is a white solid and is used as a food preservative.Which of the following can be used to test its purity ?
Examine its colour
Find its density
Determine its melting point
Determine its solubility in water
Sodium nitrate can be separated from chalk using the four processes shown below. What is the correct order in which these processes should be carried out?
Filter à crystallise à evaporate à dissolve
Filter à evaporate à crystallise à dissolve
Dissolve à evaporate à filter à crystallise
Dissolve à filter à evaporate à crystallise
Gas X has the following properties.
· Gas X is alkaline in nature
· Gas X is very soluble
· Gas X is less dense than air
Which of the following experimental set-up can be used to obtain a dry sample of gas X ?
A
B
C
D
The following reaction can be used to prepare silver iodide, AgI.
AgNO3(aq) + KI(aq) à AgI(s) + KNO3(aq)
(colourless) (colourless) (yellow) (colourless)
Which method can be used toseparate silver iodide from the mixture?
Chromatography
Evaporation
Distillation
Filtration
A mixture that contain 30% of hexane and 7O% of heptane is fractionally distilled, as shown in the diagram. Hexane has a boiling point of 70oC while heptane has a boiling point of 98oC.
Predict the temperature at which the thermometer first shows a constant reading, and identify the liquid collected in the conical flask.
A
B
C
D
Which of these molecules is not a compound ?
HCl
Cl2O
CO2
O3
A
B
C
D
Kaolinite is the clay mineral with the chemical formula Al2Si2O5(OH)4. It is used for making ceramics. How many elements are present in kaolinite ?
3
4
5
7
Ammonium carbonate, (NH4)2CO3, is used as a smelling salt to revive people from faints. What is the total number of atoms present in one molecule of ammonium carbonate ?
4
8
12
14
Sodium bicarbonate is the active ingredient in baking soda. When sodium bcarbonate is heated strongly, t decomposes to give sodium carbonate (NaCO3), carbon dioxide (CO2) and water (H2O). What can you deduce from this reaction ?
Sodium bicarbonate is a mixture
Sodium bicarbonate decomposes on heating to give a mixture of elements
Sodium bicarbonate contains the elements sodium, hydrogen, carbon and oxygen
Sodium bicarbonate is the compound formed by heating sodium and carbon
Which of the following statements is true ?
The nucleus of an atom contains protons dan electrons
Isotopes of the same element have the same number of electrons
The first electron shell of an atom can hold a maximum of eight electrons
The nucleon number is the number of neutrons in the nucleus of an atom
The symbol of an element X is 23X11. Which of the following is the atomic structure of an atom of element X?
A
B
C
D
The diagram shows the nucleus of an atom of element Q.
Which of the following represents the symbol of element Q?
6Q14
12Q6
6Q12
14Q6
A
B
C
D
The atoms 14C and 14N _____________
Are isotopes
Have the same total number of protons and electrons
Have the same total number of electrons and neutrons
Have the same chemical properties
The proton number of an element Q is 15. What is the electronic structure of Q3-?
2, 8
2, 8, 2
2, 8, 5
2, 8, 8
A
B
C
D
Which of the following statement is not true ?
A single covalent bond is formed by the sharing of two electrons
Ionic compounds are usually solid at room condition
The ammonium ion, NH4+, contains covalent bond
In the information of alumunium oxide, Al2O3, each alumunium atom loses two electron
A
B
C
D
A
B
C
D
