Trivia: Elements And Compounds Test! Ultimate Quiz

1. This compound has the formula FeO. It is also known as 'rust'. What elements are bound together by chemical bonds in this compound?

Lead and oxygen

Iron and oxygen

Fluorine and oxygen

Fennel and oxygen

Remember, some element symbols, like Fe are from the Latin name for a type of atom or substance.

Explanation

Remember, some element symbols, like Fe are from the Latin name for a type of atom or substance.

2. Aluminum oxide is a compound with the formula Al₂O₃. How many ATOMS IN TOTAl (both Al and O) are in this formula?

2

3

5

There are TWO aluminium atoms (the 2 is after the Al) and THREE oxygen atoms (the 3 is after the O). This makes 2 + 3 = 5 atoms in total.

Explanation

There are TWO aluminium atoms (the 2 is after the Al) and THREE oxygen atoms (the 3 is after the O). This makes 2 + 3 = 5 atoms in total.

3. CaCl₂ is another compound. Although it is a type of chemical called a 'salt' it is not edible like table salt. It would burn a person's mouth if they ate it! How many chlorine atoms do you think are in each particle of calcium chloride?

1

2

3

None

The little 2 (or other numbers) in chemical formulae tell us how many of each type of atom (elements) would be in one particle. The number goes AFTER the element it is for. If there is only one of an element, we don't bother to show the little 1. So calcium chloride's formula shows ONE Ca and TWO Cl (this would be THREE atoms in total)

Explanation

The little 2 (or other numbers) in chemical formulae tell us how many of each type of atom (elements) would be in one particle. The number goes AFTER the element it is for. If there is only one of an element, we don't bother to show the little 1. So calcium chloride's formula shows ONE Ca and TWO Cl (this would be THREE atoms in total)

4. Silver sulfide (also written 'silver sulfide') has the formula Ag₂S. It is the 'tarnish' or black coating that forms on silver plates, spoons, and even coins over time. How many silver atoms are in this formula?

1

2

3

This is a trick question, Ag is not the symbol for silver!

The formula Ag2S indicates that there are two silver atoms present in each molecule of silver sulfide.

Explanation

The formula Ag2S indicates that there are two silver atoms present in each molecule of silver sulfide.

5. Which one of these elements is found in the compound called calcium oxide (CaO)?

Oxygen

Carbon

Oxide

Calcide

Calcium oxide (CaO) is a compound composed of the elements calcium and oxygen. Oxygen is present in the compound as it combines with calcium to form calcium oxide. Therefore, the correct answer is oxygen.

Explanation

Calcium oxide (CaO) is a compound composed of the elements calcium and oxygen. Oxygen is present in the compound as it combines with calcium to form calcium oxide. Therefore, the correct answer is oxygen.

6. Match the following

NaCl

MgO

FeS

AgI (that is a capital i)

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7. How many atoms are in one particle of FeO?

1

2

3

4

The correct answer is 2 because FeO is a compound consisting of one iron (Fe) atom and one oxygen (O) atom. Therefore, there are two atoms in one particle of FeO.

Explanation

The correct answer is 2 because FeO is a compound consisting of one iron (Fe) atom and one oxygen (O) atom. Therefore, there are two atoms in one particle of FeO.

8. What do you think the Science name for 'rust' is?

Iron oxygen

Iron oxate

Tarnish

Iron oxide

Iron oxide is the correct answer because rust is a form of iron oxide. When iron reacts with oxygen and moisture in the presence of air, it undergoes oxidation and forms iron oxide, commonly known as rust. This reddish-brown compound is formed on the surface of iron or steel objects and is responsible for their corrosion. Therefore, iron oxide is the scientific name for rust.

Explanation

Iron oxide is the correct answer because rust is a form of iron oxide. When iron reacts with oxygen and moisture in the presence of air, it undergoes oxidation and forms iron oxide, commonly known as rust. This reddish-brown compound is formed on the surface of iron or steel objects and is responsible for their corrosion. Therefore, iron oxide is the scientific name for rust.

9. How many ATOMS IN TOTAL are in the formula for aluminum chloride? AlCl₃

2

3

4

5

There is only ONE Al atom because there is NO LITTLE NUMBER after the Al. Remember, we don't write a little number if there is only one of the elements.

Explanation

There is only ONE Al atom because there is NO LITTLE NUMBER after the Al. Remember, we don't write a little number if there is only one of the elements.

10. Select all the ones that are true for Ag₂S

This formula has 3 atoms in total

This compound contains silver and sulphur

The name of this compound is silver sulphur

This compound forms when oxygen in the air reacts with silver on plates or coins

This compound forms when sulphur in the air or in food reacts with things made from silver

There are tiny amounts ('traces' or sulphur in our food and in the air we breathe. Especially the air near hot pools like those found in Rotorua! The rotton egg smell is our nose detecting sulphur atoms or sulphur dioxide gas! The silver and sulphur react to form silver sulphide.

Explanation

There are tiny amounts ('traces' or sulphur in our food and in the air we breathe. Especially the air near hot pools like those found in Rotorua! The rotton egg smell is our nose detecting sulphur atoms or sulphur dioxide gas! The silver and sulphur react to form silver sulphide.

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