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HIA International — Grade 6

Unit 1: Cells and organisms

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Unit 2: States of matter, atoms and compounds

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Unit 3: The Solar System and energy

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Unit 4: Living organisms and classification

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Unit 5: Metals, non-metals, acids and alkalis

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Unit 6: Sound, the Earth and eclipses

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Unit 7: Microorganisms and food webs

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Unit 8: Chemical reactions

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Unit 9: Electricity and circuits

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Quiz

Checkpoint Grade 6 Unit 2 – 2.6 Compounds And Formulae

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Compounds And Formulae Checkpoint Chemistry quiz: free practice for Cambridge Checkpoint (chemistry). Work through this Compounds And Formulae Checkpoint Chemistry quiz and get instant feedback on every answer. If you get stuck, review the 9.6 Compounds and formulae lesson. More practice: Cambridge Checkpoint (chemistry) — all units. Syllabus: Cambridge Lower Secondary programme.

  • Questions count: 47
  • Passing grade: B+
  • Time limit:
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1.
Which statement best expresses the lesson objective about Compounds and formulae?
Explain the difference between elements and compounds
The terms bonding and compound are always interchangeable
Evidence is unnecessary when studying Compounds and formulae
Every model is an exact copy of reality
2.
Which practical work belongs to Compounds And Formulae?
Measure temperature and volume while heating water and identify patterns in results
Model particles physically to represent melting, freezing, evaporation and condensation
Use observations to classify materials and evaluate a particle model
Build simple particle models of compounds and interpret chemical formulae
3.
The diagram shows the particles in four boxes, A to D. Grey and orange circles are atoms of two different elements, and a line between atoms is a bond. Which box contains only a compound?
Dr Dabour Hub Academy - figure 1
Box A only
Box B only
Box C only
Box D only
4.
The diagram shows one particle of substance Z. Which formula correctly represents this particle?
Dr Dabour Hub Academy - figure 2
The formula N3H
The formula NH3
The formula H3N3
The formula NH
5.
Particles P and Q in the diagram are made from the same two elements. One of these gases is the gas you breathe out; the other is a deadly poison. Which gas is the deadly poison?
Dr Dabour Hub Academy - figure 3
Q, which is carbon monoxide
P, which is carbon dioxide
Q, which is carbon dioxide
P, which is carbon monoxide
6.
Rania heats magnesium ribbon in the crucible shown to make magnesium oxide. Her teacher tells her to lift the lid slightly from time to time. What is the main reason for lifting the lid?
Dr Dabour Hub Academy - figure 4
To let air in, so magnesium atoms can bond with oxygen
To let the magnesium atoms escape so the crucible gets lighter
To cool the magnesium so that it does not form a compound
To let the oxygen out of the crucible so the product is pure
7.
The diagram shows the particles in a small sample of gas from a room. How many different compounds are shown in the sample?
Dr Dabour Hub Academy - figure 5
Two compounds
Five compounds
Four compounds
One compound only
8.
Lina's group recorded the observations in the table. Which statement uses the evidence best to show that a compound was made by heating?
The black solid is a different colour, so it must still be a mixture
The stirred powder has grey specks, so iron and sulfur had already bonded
The black solid contains iron yet is not magnetic, so it has new properties
Sulfur is not magnetic, so the black solid must be only sulfur
9.
Hamid burned three samples of magnesium completely and recorded the results in the table. Magnesium oxide always has a fixed ratio of magnesium to oxygen. Predict the mass of magnesium oxide made from 0.60 g of magnesium.
About 0.84 g
About 0.60 g
About 1.20 g
About 1.00 g
10.
Chen named four compounds from the elements in them, as shown in the table. Which row has the correct name?
Row 1 only
Row 2 only
Row 3 only
Row 4 only
11.
Ivan counted the total number of atoms in one particle of each compound. Which of his answers is wrong?
Magnesium carbonate; it should be 4 atoms
Lithium sulfate; it should be 7 atoms
Hydrogen sulfide; it should be 2 atoms
Methane; it should be 4 atoms
12.
Farah classified six substances by counting the symbols, as shown in the table. Which answer did she get wrong, and why?
FeS – two symbols joined in a formula show a mixture
N2 and O2 – substances written separately show a compound
O2 – it has only one kind of symbol, so it is an element
H2O – the small 2 means it is a mixture of two waters
13.
A laboratory broke down pure water from three sources into hydrogen and oxygen. Which conclusion is best supported by the results in the table?
Water is a mixture, because the masses are different for each sample
Sea water contains more oxygen than rain water, so it is a different compound
Water is an element, because every sample gave the same two gases
Water is a compound, because oxygen and hydrogen are always in the same ratio
14.
Maya is using modelling clay balls and sticks to build one particle of hydrogen sulfide (H2S). Which set should she use?
One hydrogen ball, two sulfur balls and two sticks
Two hydrogen balls, one sulfur ball and two sticks
Two hydrogen balls and two sulfur balls with three sticks
One hydrogen ball, one sulfur ball and one stick
15.
After heating iron and sulfur, Omar sees a black solid. He writes: "The black colour proves that a new compound formed." How could his conclusion be made stronger?
Repeat the heating until the solid turns completely yellow again
Taste a tiny amount of the solid to see whether it is salty
Weigh the magnet before and after holding it near the solid
Also test a property, such as magnetism, and compare it with the starting materials
16.
Priya wants to get hydrogen and oxygen back out of pure water. Which method could work?
Pouring the water through filter paper
Using a magnet to pull out the oxygen atoms
Leaving the water to settle so the hydrogen floats
A chemical reaction, such as passing electricity through the water
17.
Magnesium is a shiny metal and oxygen is a colourless gas. When magnesium burns, a white powder called magnesium oxide forms. Why does the white powder not look like either element?
The atoms have bonded into a new substance with new properties
The magnesium atoms have been changed into oxygen atoms
The magnesium has been mixed with oxygen but not joined
The white powder is made of only one type of atom
18.
A compound is made of potassium, nitrogen and oxygen. What is its name?
Potassium nitride
Nitrogen potassium oxide
Potassium nitrate
Potassium nitrogen
19.
Aluminium oxide has the formula Al2O3. Which description of one particle is correct?
Two aluminium atoms and two oxygen atoms, four atoms in total
Two aluminium atoms and three oxygen atoms, five atoms in total
One aluminium atom and three oxygen atoms, four atoms in total
Two aluminium atoms and three oxygen atoms, six atoms in total
20.
Leila says one particle of sulfur dioxide has two sulfur atoms. Tom says it has one sulfur atom and two oxygen atoms. Who is right?
Leila, because di- always refers to the first element
Leila, because sulfur is written before oxygen in the name
Tom, because the prefix di- belongs to the oxide part of the name
Neither, because sulfur dioxide contains no oxygen atoms
21.
Sam wants to write one rule that lets classmates decide from a formula alone whether a substance is an element or a compound. Which rule works for every formula?
Any formula with a small number in it is a compound
Any formula with more than two atoms in it is a compound
Any formula that includes the symbol O is an element
One kind of symbol means an element; two or more different symbols means a compound
22.
Chlorine is a poisonous gas, yet people sprinkle sodium chloride on their food. Which is the best explanation?
Only a tiny amount of chlorine gas is mixed into the salt
The chlorine atoms are bonded to sodium in a compound with new properties
Cooking the food removes the chlorine from the salt
Sodium chloride contains no chlorine atoms at all
23.
Match the prefix to what it tells you in a compound name. Which pairing is correct?
mono- – two atoms of that element
di- – one atom of that element
mono- – three atoms of that element
di- – two atoms of that element
24.
Match the compound to the elements it contains. Which pairing is correct?
Magnesium carbonate – magnesium and carbon only
Hydrogen sulfide – hydrogen and sulfur
Calcium nitrate – calcium and nitrogen only
Sodium chloride – sodium, chlorine and oxygen
25.
Match the key term to its meaning. Which pairing is correct?
Formula – a drawing of atoms shown as coloured circles
Bonding – mixing two elements without joining them
Particle diagram – a drawing showing which atoms make up a particle
Compound – a substance made of one type of atom only
26.
Match each substance to its properties. Which pairing is correct?
Sodium – a white solid that is safe to eat
Chlorine – a green, poisonous gas
Sodium chloride – a soft grey metal
Chlorine – a soft, reactive grey metal
27.
Which term is described as: the small number written after a symbol showing how many of those atoms there are?
subscript
symbol equation
word equation
chemical formula
28.
In CO2 there are _____ oxygen atoms.
one
four
two
three
29.
The bar chart shows the atoms in one particle of compound W. Using the naming rules, compound W is called _____.
Dr Dabour Hub Academy - figure 6
calcium carbide
carbon calcium oxide
calcium oxide
calcium carbonate
30.
Bonding is the chemical term for two atoms _____.
mixing without joining
changing into new atoms
joining tightly together
separating from each other
31.
The ending -ate in the name calcium nitrate tells you the compound also contains _____.
sodium atoms
oxygen atoms
hydrogen atoms
carbon atoms
32.
In a formula, a small number such as the 3 in NH3 applies to _____.
the symbol just before it
every symbol in the formula
the symbol just after it
the first symbol only
33.
The formula H2O means two hydrogen atoms joined to one oxygen atom. - True or false?
True
False
34.
The formula of a compound changes from country to country. - True or false?
True
False
35.
Sodium and chlorine form sodium chloride. - True or false?
True
False
36.
In CO2 there are two carbon atoms and one oxygen atom. - True or false?
True
False
37.
Look again at the four boxes of particles. A student says: "Box B contains atoms bonded together into molecules, so box B must be a compound." True or false?
Dr Dabour Hub Academy - figure 7
False, because each molecule in B has only one kind of atom
True, because any atoms bonded together make a compound
True, because box B has more atoms than box A
False, because the atoms in box B are not bonded at all
38.
Using the table, Aarav concludes: "Compounds made from the same two elements always have similar properties." True or false?
False – same elements with different numbers of atoms give very different compounds
True – both compounds contain carbon and oxygen atoms
True – both have the same number of carbon atoms per particle
False – carbon monoxide does not contain any oxygen atoms
39.
In a practical, a magnet can be used to tell apart a mixture of iron filings and sulfur from the iron sulfide made by heating them. True or false?
True – iron in the mixture is still magnetic but iron sulfide is not
False – both contain iron, so a magnet attracts both of them
False – a magnet attracts neither, because sulfur blocks it
True – the magnet attracts iron sulfide but not the mixture
40.
A school laboratory should not make table salt by reacting sodium with chlorine, because sodium is a very reactive metal and chlorine is a poisonous gas. True or false?
True – the elements are dangerous even though the salt is safe
False – the elements are as safe as the salt they make
False – sodium and chlorine do not react to make salt
True – the salt made would be as poisonous as the chlorine
41.
A compound made only of magnesium and sulfur is called magnesium sulfate. True or false?
False – with two elements the name ends in -ide: magnesium sulfide
True – every compound containing sulfur ends in -ate
True – the metal comes first, so the name is correct
False – the correct name is sulfur magnesium
42.
Copper sulfate is made of three different elements. True or false?
False – it contains only copper and sulfur
False – it contains only copper, so it is an element
True – it contains copper, sulfur and sodium
True – it contains copper, sulfur and oxygen
43.
In the formula MgCl2 (magnesium chloride), the 2 shows that there are two magnesium atoms. True or false?
True – the 2 applies to every atom in the formula
True – the metal always has the small number
False – the 2 applies to Cl, so there are two chlorine atoms
False – the 2 means there are two particles of the compound
44.
The elements are all listed in the Periodic Table, but compounds such as water are not listed there. True or false?
True – the Periodic Table lists elements, not compounds
False – compounds are listed on the right of the table
False – water is listed because it is very common
True – but only metal elements are listed there
45.
When iron and sulfur form iron sulfide, the iron atoms are destroyed and replaced by brand-new atoms. True or false?
True – that is why iron sulfide is not magnetic
False – the same atoms are still there but are now bonded
True – a compound is made of new kinds of atom
False – the iron atoms turn into sulfur atoms
46.
Water (H2O) and hydrogen peroxide (H2O2) contain the same two elements, so they must have the same properties. True or false?
True – compounds of the same elements always behave the same
True – both particles contain two hydrogen atoms
False – hydrogen peroxide contains no hydrogen atoms
False – different numbers of atoms make a completely different compound
47.
In one particle of lithium sulfate, Li2SO4, there are more oxygen atoms than atoms of any other element. True or false?
True – there are 4 oxygen, 2 lithium and 1 sulfur atom
False – there are more lithium atoms than oxygen atoms
False – there are equal numbers of each kind of atom
True – there are 4 oxygen atoms but no sulfur atoms
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Part of Unit 2: States of matter, atoms and compounds — see every lesson and quiz in this unit.
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