When zinc metal was added to some sulphuric acid, small bubbles of gas were observed. Describe a test that would show if the gas produced was hydrogen.
Important Questions on Chemical Reactions
Explain what is meant by the statement:
“New compounds are formed during a chemical reaction.”
Give an example in your answer.
Making copper chloride crystals:
Aki wanted to make some copper chloride crystals. He started by reacting copper oxide with hydrochloric acid. After filtering off the excess copper oxide, he put the blue copper chloride solution into an evaporating basin and evaporated off the water to obtain the crystals.
- Read the description and underline the reactants.
Making copper chloride crystals:
Aki wanted to make some copper chloride crystals. He started by reacting copper oxide with hydrochloric acid. After filtering off the excess copper oxide, he put the blue copper chloride solution into an evaporating basin and evaporated off the water to obtain the crystals.
- To get the reaction to work, Aki had to heat the reactants. Draw a labelled diagram of the equipment he should use.
Making copper chloride crystals:
Aki wanted to make some copper chloride crystals. He started by reacting copper oxide with hydrochloric acid. After filtering off the excess copper oxide, he put the blue copper chloride solution into an evaporating basin and evaporated off the water to obtain the crystals.
- Describe safety precautions Aki should take whilst heating the mixture.
Making copper chloride crystals:
Aki wanted to make some copper chloride crystals. He started by reacting copper oxide with hydrochloric acid. After filtering off the excess copper oxide, he put the blue copper chloride solution into an evaporating basin and evaporated off the water to obtain the crystals.
- Draw the apparatus showing how Aki should evaporate off the water.
Making copper chloride crystals:
Aki wanted to make some copper chloride crystals. He started by reacting copper oxide with hydrochloric acid. After filtering off the excess copper oxide, he put the blue copper chloride solution into an evaporating basin and evaporated off the water to obtain the crystals.
- Read the description and underline the products.
Making copper chloride crystals:
Aki wanted to make some copper chloride crystals. He started by reacting copper oxide with hydrochloric acid. After filtering off the excess copper oxide, he put the blue copper chloride solution into an evaporating basin and evaporated off the water to obtain the crystals.
- Write a word reaction for the equation.
Making copper chloride crystals:
Aki wanted to make some copper chloride crystals. He started by reacting copper oxide with hydrochloric acid. After filtering off the excess copper oxide, he put the blue copper chloride solution into an evaporating basin and evaporated off the water to obtain the crystals.
- Aki was so pleased with the final crystals that he decided to make some more, but there was no copper oxide left. Name another chemical he could use.
