Stage 5 Chemistry Quiz

  The element sodium occupies position 11 on the Periodic Table and it has an atomic mass of 23.

• p=10 n= 13 e= 10

• p=10 n= 13 e= 13

• p=11 n=12 e=23

• p=11 n=12 e=11

The diagram shows three isotopes of hydrogen.

 What feature makes all of the above isotopes of hydrogen?

• They all have one proton in the nucleus

• They all have one neutron in the nucleus

• They all have one electron in orbit

• They all have one neutron in orbit

The chemical equation shows the combustion reaction between a fuel (e.g. methane CH₄) and oxygen.

 

Fuel + oxygen --> carbon dioxide + X  +  energy

 

What is X?

• Hydrogen Peroxide

• Water

• Oxygen

• Carbon Monoxide

The flow chart is a key for acids and bases with the properties missing.

Which choice correctly identifies the missing properties W, X, Y and Z?

• W = blue, X = sour, Y= >7, Z = H⁺

• W = blue, X = bitter, Y= <7, Z = H⁺

• W = red, X = sour, Y= <7, Z = OH^-

• W = red, X = bitter, Y= >7, Z = OH^-

Which of the following chemical equations shows a neutralisation reaction?

• acid  +  carbonate -->  salt  +  water  +  carbon dioxide

• acid  +  carbonate -->    salt  +  water  +  carbon monoxide

• acid  +  base -->    salt  +  water 

• acid  +  base  -->  salt  +  water  +  carbon dioxide

Some students were given four pieces of magnesium ribbon, cut from the same strip. The four strips were placed into separate tests tubes each containing the same volume, but different concentrations of hydrochloric acid. The students measured how long it took each piece to react completely. They made the following observations over the 5 minutes of the experiment:

             

Strip W was the first disappear, strip Y was the second; strip X was the last to disappear completely. Some of strip Z was still remaining after the 5 minutes.

 

Which of the following conclusions is most justified by these observations?

• The acid used to react with Z was diluted with vinegar

• The acid used to react with W is more dilute than the acid used to react with Y.

• The acid used to react with X is more concentrated than the acid used to react with W.

• The acid used to react with Y is more concentrated than the acid used to react with Z.

When sulfuric acid reacts with potassium carbonate, there are three chemical products formed and energy is produced.

         

Which equation correctly summarises this reaction?

• Sulfuric acid + potassium carbonate → potassium sulfate + water + energy

• Sulfuric acid + potassium carbonate → potassium sulfate + carbon dioxide + energy

• Sulfuric acid + potassium sulphate → potassium carbonate + carbon dioxide +

  water + energy

• Sulfuric acid + potassium carbonate → potassium sulfate + carbon dioxide + water + energy

Consider the elements in vertical group 2 of the Periodic Table. Which statement about these elements is correct?

• They have similar chemical and physical properties.

• They have identical chemical reactivity.

• They have the same number of electrons.

• Their physical and chemical properties will be unrelated.

Which statement about chemical reactions is correct?

• Energy is always added to reactants to form new products.       

• Some atoms are rearranged and others are changed into different atoms.   

• Atoms are rearranged to form different compounds or substances.

• Atoms are lost as energy in the formation of new elements.     

The element aluminium occupies position 13 of the Periodic Table and has an atomic mass of 27.

 

Which alternative correctly shows the composition of an aluminium atom?

• p=14, n=13, e=13

• p=13, n=14, e=14

• p=14, n=13, e=14

• p=13, n=14, e=13