Podcast
Questions and Answers
International hazard symbols indicate dangers with chemicals. So we know what to...
International hazard symbols indicate dangers with chemicals. So we know what to...
- Do to be safe/what precautions to take (correct)
- Do in case of spillage or accident (correct)
- Avoid using chemicals altogether
- Ignore when seeing the symbols
What does this symbol mean, what does it indicate the substance can do, and what precautions should you take when you see it?
What does this symbol mean, what does it indicate the substance can do, and what precautions should you take when you see it?
This symbol means that the substance is corrosive. The substance attacks and destroys living tissue, such as skin and eyes. You should take precautions such as wearing gloves and eye protection.
What does this symbol mean, what does it indicate the substance can do, and what precautions should you take when you see it?
What does this symbol mean, what does it indicate the substance can do, and what precautions should you take when you see it?
This symbol means that the substance is toxic. The substance can cause death if swallowed, breathed or absorbed by the skin. You should take precautions such as wearing gloves, googles and having ventilation to keep safe at all times.
What does this symbol mean, what does it indicate the substance can do, and what precautions should you take when you see it?
What does this symbol mean, what does it indicate the substance can do, and what precautions should you take when you see it?
What does this symbol mean, what does it indicate the substance can do, and what precautions should you take when you see it?
What does this symbol mean, what does it indicate the substance can do, and what precautions should you take when you see it?
What does this symbol mean, and what is its typical hazard?
What does this symbol mean, and what is its typical hazard?
What does this symbol mean, and what is its typical hazard?
What does this symbol mean, and what is its typical hazard?
What does this symbol mean, and what is its typical hazard?
What does this symbol mean, and what is its typical hazard?
Why would a hazard symbol of a 'flame' be on an ethanol bottle?
Why would a hazard symbol of a 'flame' be on an ethanol bottle?
A concentrated solution is a _____ amount of dissolved solute in a given volume of water. A dilute solution is a _____ amount of dissolved solute in a given volume of water.
A concentrated solution is a _____ amount of dissolved solute in a given volume of water. A dilute solution is a _____ amount of dissolved solute in a given volume of water.
How could you create a dilute solution from a concentrated solution?
How could you create a dilute solution from a concentrated solution?
How could you create a concentrated solution from a dilute solution? (Select all that apply)
How could you create a concentrated solution from a dilute solution? (Select all that apply)
State the definition of a strong acid.
State the definition of a strong acid.
Select the examples of strong acids:
Select the examples of strong acids:
The pH values range from ___ in strong acids. The pH values range from ___ in weak acids.
The pH values range from ___ in strong acids. The pH values range from ___ in weak acids.
What is the definition of a weak acid?
What is the definition of a weak acid?
Select the examples of weak acids:
Select the examples of weak acids:
Hydrochloric acid is a solution of ____ acid and has a high _______ level. Therefore hydrochloric acid has ____ concentrations of hydrogen (H+) ions.
Hydrochloric acid is a solution of ____ acid and has a high _______ level. Therefore hydrochloric acid has ____ concentrations of hydrogen (H+) ions.
Ethanoic acid is a solution of ____ acid and has a low _______ level. Therefore ethanoic acid has ___ concentrations of hydrogen (H+) ions.
Ethanoic acid is a solution of ____ acid and has a low _______ level. Therefore ethanoic acid has ___ concentrations of hydrogen (H+) ions.
Explain why hydrochloric acid has a lower pH than ethanoic acid.
Explain why hydrochloric acid has a lower pH than ethanoic acid.
Explain why carbonic acid has a higher pH than sulfuric acid.
Explain why carbonic acid has a higher pH than sulfuric acid.
The higher the number of ______ ions in a certain volume, the _____ the hydrogen ion concentration, the more _____ the solution is, the lower the __ of the acidic solution.
The higher the number of ______ ions in a certain volume, the _____ the hydrogen ion concentration, the more _____ the solution is, the lower the __ of the acidic solution.
What do pH scales measure?
What do pH scales measure?
Match the following types of solutions with their corresponding pH levels:
Match the following types of solutions with their corresponding pH levels:
The lower the pH, the more _____ the solution is. The higher the pH, the more _____ the solution is.
The lower the pH, the more _____ the solution is. The higher the pH, the more _____ the solution is.
Match the common acids with their correct symbol:
Match the common acids with their correct symbol:
Match the common alkalis with their correct symbol:
Match the common alkalis with their correct symbol:
Neutral solutions have an equal number/concentration of ______ and ______ ions.
Neutral solutions have an equal number/concentration of ______ and ______ ions.
What is an indicator?
What is an indicator?
Match the indicator with their colour when in an acidic solution:
Match the indicator with their colour when in an acidic solution:
Match the indicator with their colour when in an alkaline solution:
Match the indicator with their colour when in an alkaline solution:
What is a base?
What is a base?
acid + base -> ___ + ____
acid + base -> ___ + ____
A reaction between an acid and a base is called a ________ reaction.
A reaction between an acid and a base is called a ________ reaction.
Select the substances that can act as a base.
Select the substances that can act as a base.
What is an alkali?
What is an alkali?
Match the following chemical reactions with their products:
Match the following chemical reactions with their products:
A salt forms when _______ ions in acid are replaced by _____ ions or _______ ions.
A salt forms when _______ ions in acid are replaced by _____ ions or _______ ions.
Match the name of the acid with the type of salt produced:
Match the name of the acid with the type of salt produced:
Describe the process of the carbon dioxide test.
Describe the process of the carbon dioxide test.
Describe the process of the hydrogen test.
Describe the process of the hydrogen test.
When aqueous solutions are dissolved in water acid ____ and produces _______ ions. This means there is a _____ hydrogen ion concentration. This means that the solution is more _____ and the pH is _____.
When aqueous solutions are dissolved in water acid ____ and produces _______ ions. This means there is a _____ hydrogen ion concentration. This means that the solution is more _____ and the pH is _____.
When aqueous solutions are dissolved in water, alkalis produce _______ ions. This means there is a _____ hydroxide ion concentration. This means that the solution is more _____ and the pH is _____.
When aqueous solutions are dissolved in water, alkalis produce _______ ions. This means there is a _____ hydroxide ion concentration. This means that the solution is more _____ and the pH is _____.
What are the two ways of making soluble salts?
What are the two ways of making soluble salts?
Match the order of the steps with their description in relation to making insoluble salts:
Match the order of the steps with their description in relation to making insoluble salts:
Explain how you could go about making insoluble salts.
Explain how you could go about making insoluble salts.
Match the method of making a soluble salt with when to use which one:
Match the method of making a soluble salt with when to use which one:
Match the method of making a soluble salt with its equation:
Match the method of making a soluble salt with its equation:
When making a soluble salt (method 1) you should firstly ____ the acid in a water bath because a higher temperature will lead to a _____ reaction. You should then slowly add the ____ (metal oxide) to the acid and mix until some remains at the _____ of the beaker. This will make sure that all the acid has _____. Next, you will need to _____ to remove the unreacted solid left from the solution. You should then _____ the filtrate containing the soluble salt and water into the evaporating dish. Next, heat the solution by gently using a bunsen burner to ________ some of the water. You will have to then leave the solution to ____ to allow the salt to cyrstalise. Filter off the solid salt and then leave it to ___.
When making a soluble salt (method 1) you should firstly ____ the acid in a water bath because a higher temperature will lead to a _____ reaction. You should then slowly add the ____ (metal oxide) to the acid and mix until some remains at the _____ of the beaker. This will make sure that all the acid has _____. Next, you will need to _____ to remove the unreacted solid left from the solution. You should then _____ the filtrate containing the soluble salt and water into the evaporating dish. Next, heat the solution by gently using a bunsen burner to ________ some of the water. You will have to then leave the solution to ____ to allow the salt to cyrstalise. Filter off the solid salt and then leave it to ___.
Explain how you could go about making soluble salts (method 1).
Explain how you could go about making soluble salts (method 1).
Why, when making a soluble salt, should you first heat the acid in a water bath?
Why, when making a soluble salt, should you first heat the acid in a water bath?
Why should you leave some remaining base (metal oxide) at the bottom of the beaker when adding it slowly?
Why should you leave some remaining base (metal oxide) at the bottom of the beaker when adding it slowly?
When making a soluble salt (method 2) you should start with measuring the set volume of _____ into a conical flask using a ______. Then you should add 3-4 drops of an ______ (e.g. phenolphthalein). Then, slowly add the acid to the alkali using a ______, until the indicator changes ____ - this is called the ___ ____. You should note the exact number of ____ that was needed for the indicator to change colour and react with the alkali. Next, carry out the reaction in a beaker, using the ____ volume of alkali and acid, but without the ______ so that the salt formed isn't _________ with it. You should then _____ the solution containing the salt and water into an evaporating dish. Next, heat the solution by gently using a Bunsen burner to ________ some of the water. You will have to then leave the solution to ____ to allow the salt to crystallise. Filter off the solid salt and then leave it to ___.
When making a soluble salt (method 2) you should start with measuring the set volume of _____ into a conical flask using a ______. Then you should add 3-4 drops of an ______ (e.g. phenolphthalein). Then, slowly add the acid to the alkali using a ______, until the indicator changes ____ - this is called the ___ ____. You should note the exact number of ____ that was needed for the indicator to change colour and react with the alkali. Next, carry out the reaction in a beaker, using the ____ volume of alkali and acid, but without the ______ so that the salt formed isn't _________ with it. You should then _____ the solution containing the salt and water into an evaporating dish. Next, heat the solution by gently using a Bunsen burner to ________ some of the water. You will have to then leave the solution to ____ to allow the salt to crystallise. Filter off the solid salt and then leave it to ___.
Explain how you could go about making soluble salts (method 2).
Explain how you could go about making soluble salts (method 2).
Why should you repeat the reaction in a beaker without the indicator this time in method 2 of making soluble salts?
Why should you repeat the reaction in a beaker without the indicator this time in method 2 of making soluble salts?
When making insoluble salts, what are the products of the reaction: Lead nitrate + Sodium chloride?
When making insoluble salts, what are the products of the reaction: Lead nitrate + Sodium chloride?
When making soluble salts, what are the products of the reaction: Magnesium oxide + Sulfuric acid?
When making soluble salts, what are the products of the reaction: Magnesium oxide + Sulfuric acid?
When making soluble salts, what are the products of the reaction: Sodium hydroxide + Sulfuric acid?
When making soluble salts, what are the products of the reaction: Sodium hydroxide + Sulfuric acid?
What is another name for a hydroxide?
What is another name for a hydroxide?
When making soluble salts, what are the products of the reaction: Sodium carbonate + Hydrochloric acid?
When making soluble salts, what are the products of the reaction: Sodium carbonate + Hydrochloric acid?
When acid reacts with metal, what are the products of the reaction: Magnesium + Hydrochloric acid?
When acid reacts with metal, what are the products of the reaction: Magnesium + Hydrochloric acid?
Water forms when ______ ions from the acid combines with ____ ions (in metal oxide) or ______ ions (in metal hydroxide) to form water.
Water forms when ______ ions from the acid combines with ____ ions (in metal oxide) or ______ ions (in metal hydroxide) to form water.
How does water form?
How does water form?
Salt is formed by replacing what with what?
Salt is formed by replacing what with what?
Carbon dioxide and water forms when what combines with what?
Carbon dioxide and water forms when what combines with what?
Match the base with its chemical symbol:
Match the base with its chemical symbol:
Match the base with its chemical symbol:
Match the base with its chemical symbol:
