OCR C2 Chemistry

What element is present in the centre of the Earth?

• Iron
• Aluminium
• Zinc
• Magnesium

What type of rock is granite?

• Metamorphic
• Sedimentary
• Igneous
• Crushed

How is cement made?

• Cool limestone and clay
• Heat limestone and clay
• Heat limestone and gravel
• Heat clay and gravel

Complete the equation for the thermal decomposition of
CaCO_{3 -->} 

• Ca₂O + CO
• CaO + CO
• CaO + CO₂
• CaO₂ + CO₂

What is a use of amalgam?

• Filling teeth
• Sticking two metals together
• Making car bodies
• Taps

Name the process:
N₂ + 3H₂ --> 2NH₃

• Contact Process
• Contract Process
• Haber Process
• Harber Process

Complete the following equation:
Magnesium Oxide + Hydrochloric acid -->

• Magnesium Chloride + Oxygen
• Magnesium Chloride + Water
• Magnesium Oxide + Water
• Magnesium Oxide + Carbon Dioxide

What is the molecular formula for sulfuric acid? 

• HSO₂
• HSO₄
• H₂SO₂
• H₂SO₄

Which essential elements are found in fertilisers?

• NPK
• MPK
• NFK
• NPP

What occurs at the anode during the electrolysis of brine?

• 2H⁺ + 2e^- --H₂
• H₂ --> 2H⁺ + 2e^-
• 2Cl^- -2e^- --> Cl₂
• Cl₂ --> 2Cl^- - 2e^-