WorksheetsGrade 10 Physical Sciences chemistry quiz
Total questions: 106
Worksheet time: 5hrs 38mins
Which ONE of the following is a good conductor of electricity?
Wood
Plastic
Silicon
Copper
Refer to the table below to fill in the spaces in the following sentence. The density of the metals ... and that of non-metals ... across period 2 of the periodic table.
Decreases Increases
Decreases Decreases
Increases Decreases
Increases Increases
Which ONE of the following molecular mass represents hydrogen chloride?
57,5
35,5
36,5
40,2
The bonding between crystal lattices can only be a/an ... bond.
ionic
metallic
covalent
pure
Study the diagram below. The diagram above represents the following:
A lattice structure between ions
A buckminsterfullerene of sulphur
Intermolecular forces between molecules
Positive metal kernels and the sea of delocalised electrons
Thando slowly heats a chocolate bar and observes the changes. Which ONE of the following is the most accurate conclusion?
Chocolate undergoes a chemical change
Chocolate undergoes a physical change
Chocolate decomposes into its constituent components
Chocolate undergoes no change
Study the equation below: 2H2(g) + O2(g) → 2H2O(g) Which ONE of the statements below is CORRECT?
2 molecules of hydrogen gas react with 1 atom of oxygen gas to form 2 atoms of water vapour.
2 moles of hydrogen gas react with 1 mole of oxygen gas to form 2 moles of water vapour
4 atoms of hydrogen gas react with 2 molecules of oxygen gas to form 2 moles of water vapour.
4 g of hydrogen gas react with 16 g of oxygen gas to form 18 g of water vapour.
An aqueous mixture in a test tube contains Ag+(aq), K+(aq) and Pb+(aq). How many different solids will form when NaCℓ(aq) is added to this mixture?
None
1
2
3
SO2 gas dissolves in water and contributes to acid rain. What is the name of the acid that forms during this reaction?
Sulfuric acid
Carbon dioxide acid
H2CO3
Carbonic acid
Define the term element.
Define the term melting point.
Define the term atomic number.
Define the term ionisation energy.
Define the term covalent bond.
Define the term compound.
Define the term compound.
Choose from the different diagram illustrations above ONE that best describes each of the following substances. Write down the letter only. Diamond.
Choose from the different diagram illustrations above ONE that best describes each of the following substances. Write down the letter only. Carbon dioxide.
Choose from the different diagram illustrations above ONE that best describes each of the following substances. Write down the letter only. Helium.
Choose from the different diagram illustrations above ONE that best describes each of the following substances. Write down the letter only. Magnesium.
Choose from the different diagram illustrations above ONE that best describes each of the following substances. Write down the letter only. Sodium chloride.
Choose from the different diagram illustrations above ONE that best describes each of the following substances. Write down the letter only. Graphite.
Name the type of bond that exists between the particles of a diamond.
From the above illustrations, write down the LETTER(S) of those that represent the following chemical structures: Ionic structure.
From the above illustrations, write down the LETTER(S) of those that represent the following chemical structures: Covalent network structure.
From the above illustrations, write down the LETTER(S) of those that represent the following chemical structures: Metallic structure.
Differentiate between molecular structure and giant molecular structure.
Consider the diagram below that shows liquid water evaporating to form water vapour. Use chemical formulae to represent the process in the diagram above and indicate the phases of the substance undergoing this process.
Give THREE separation methods that can be used to reverse a physical change.
Write down: An investigative question for this investigation.
Write down: An independent variable of this investigation.
Write down: The dependent variable of this investigation.
Write down: The variable that was kept constant in this investigation.
Is this reaction a SYNTHESIS or DECOMPOSITION? Give a reason for your answer.
When a white powder of magnesium oxide was formed in the above investigation, heat was given off. Give the term that best describes the underlined phrase.
Write down the law of conservation of mass in words.
Show by means of a calculation that mass is conserved during the reaction represented by the balanced equation in QUESTION 8.3.
Give the term used to describe the substance formed in the chemical reaction.
Calculate the percentage of oxygen in a 20 g sample of magnesium oxide produced.
Write down the term that best describes the water molecule that is weakly bonded with salt.
Calculate the amount of water bonded with an unknown salt.
Write down the chemical symbol of this metal.
To which group does the metal belong?
Write down the chemical formula of an anhydrous salt above.
Calculate the mass of sodium chloride formed.
Calculate the volume of chlorine at STP if it reacts with 3.5 moles of sodium.
Use relevant calculations to determine the empirical formula of this compound.
Define the term electrolyte.
Write down the formula of ions present in this set-up.
What will happen to the brightness of the bulb in the set-up above if sodium chloride is replaced by calcium chloride? Write down INCREASE, DECREASE or REMAIN THE SAME. Give a reason for your answer.
Which of the reactions is an ion exchange reaction? Give a reason for your answer.
Which of the reactions is a redox reaction? Give a reason for your answer.
Write down an equation to show how solid calcium carbonate dissociates in water.
Write down the name of the chemical they would use to test for the presence of halides.
How can they distinguish between the THREE types of halides used during the test mentioned in QUESTION 10.3.2?
Write down the name of the compound that was tested in: Test-tube B.
Write down the name of the compound that was tested in: Test-tube C.
What type of reaction takes place between the precipitation in B and the nitric acid?
Of which sphere in the earth’s system is the water cycle a part of?
Briefly describe the process of precipitation.
Process A takes place in living plants. Name process A.
Write down ONE advantage of infiltration.
Name process B.
Name TWO significant factors which endanger the hydrosphere as a result of human interactions.
A mixture is defined as...
the combination of two or more pure substances that are bonded together.
the combination of two or more pure substances that are not bonded together.
the combination of two or more pure substances in a fixed ratio.
any substance that cannot be separated by physical methods.
Which one of the following substances is a pure substance?
O2
Air
Sand
Sea water
Which one of the following is correct regarding an atom of magnesium (Mg)? Number of Core Electrons Number of Valence Electrons
24 12
12 2
12 0
10 2
Which one of the following lists shows elements in the order of increasing atomic radius?
C,N,O,F
O,N,P,Na
Be,Mg,Aℓ,Ga
Xe,Kr,Ar,Ne
Which one of the following statements is FALSE? A chemical change is a change in which...
new substances are formed.
energy changes are relatively large.
mass is conserved.
the number of atoms change.
The chemical formula of iron (III) sulphate is...
FeS
FeSO4
Fe2(SO4)3
Fe3(SO4)2
Which one of the following pure substances has the greatest number of particles?
50 g aluminium foil
50 g copper wire
100 g silver coin
150 g gold ring
Define the term boiling point.
Write down the boiling point of substance X.
Give the phase(s) of substance X from A to B.
Give the phase(s) of substance X from D to E.
Give the name of the phase change that occurs between B and C.
Define the term isotopes.
Using the periodic table, write down the NAME or SYMBOL of the element to which the isotope X47 112 belongs.
Define the term ion.
How many protons, neutrons and electrons are there in Cu+ 29 65?
Define the term first ionisation energy.
Explain why the first ionisation energy decreases moving down the group.
Would the first ionisation energy of chlorine be GREATER THAN, LESS THAN or EQUAL TO the first ionisation energy of sodium? Give a (single sentence) reason for your answer.
Why is the second ionisation energy of lithium significantly greater than its first ionisation energy?
Define the term covalent bond.
Draw the Lewis diagram of methane (CH4).
Is the C−H bond in methane POLAR or NON-POLAR? Support your answer with an appropriate calculation.
Give the Couper notation of CO2.
Balance the chemical equation.
Is this reaction EXOTHERMIC or ENDOTHERMIC? Briefly explain.
Is this an example of a PHYSICAL or CHEMICAL change?
Write down the formula of Potassium iodide.
Write down the formula of Lead (II) nitrate.
What type of bonding exists in potassium iodide?
Predict the NAME or FORMULA of the yellow solid which formed.
Define the term one mole.
If 35 g of N2 reacts, calculate: The number of moles of N2 which react.
The number of molecules of H2 which react.
The mass of NH3 produced.
Calculate: The molar mass of (NH4)2HPO4.
The concentration of 10 g of (NH4)2HPO4 dissolved in 500 cm3 of water.
Write down the phase of ZnCl2.
Use the metallic bonding model to explain why Zn (s) is a moderately good conductor of electricity.
If 800 cm3 of 0,25 mol.dm-3 HCl solution reacts completely with excess zinc, calculate the volume of H2 produced at standard temperature and pressure.
How would the volume of H2 calculated in question 8.3 change? Write only INCREASES, DECREASES or REMAINS THE SAME.
Briefly explain your answer to question 8.4.1.
