C4: Inorganic chemistry: acids, alkalis and indicators

Give as many key words associated with acids and alkalis that you can

How do we know that a chemical reaction has taken place?

• Light is given off

• Heat is given off

• Bubbles of gas (effervescence)

• All of these

Match the indicator to the colour change when an acid is added

• Red/orange

• Universal indicator

• Red

• Litmus paper

• Red

• Phenolphthalein

• Colourless

• Methyl orange

Match the indicator to the colour change when an alkali is added

• Pink

• Universal indicator

• Blue/purple

• Methyl orange

• Blue

• Phenolphthalein

• Yellow

• Litmus paper

Which of the following substances would turn phenolphthalein indicator pink?

• Lemon juice

• Sodium hydroxide

• Vinegar (acetic acid)

• Toothpaste

Click the value of the pH that universal indicator would turn in water

Click the value of the pH that is strongly alkaline

Drag and drop the formulae for acids into the spaces:​ (a)   ​ ​ (b)   ​ ​ (c)   ​ (d)  

• HCl
• NaOH
• MgOH
• NaCl

Alkalis that are able to dissolve in water are also known as:

Complete the text using the drop down boxes below:

When dissolved in ​ (a)   acids will break apart. This is known as ​ (b)   The acid gives up ​ (c)   ions when it splits apart. ​ (d)   acids do not easily break apart when dissolved in water.

• water
• dissociation
• Weak