6 marksFoundation and Higher
A student wants to investigate how the volume of sodium hydroxide solution added to 25 cm³ of dilute hydrochloric acid affects the temperature change.
Plan an investigation the student could carry out.
Include the variables to control and how to make the results as accurate as possible.
[6 marks]6 marksFoundation and Higher
A student investigates how the concentration of hydrochloric acid affects the rate of its reaction with magnesium ribbon. Hydrogen gas is produced.
Plan an investigation using a gas collection method.
Include the variables the student should control.
[6 marks]6 marksFoundation and Higher
Silicon dioxide (silica) melts at 1710 °C. Poly(ethene) softens at about 120 °C. Methane boils at −162 °C.
Explain the differences in these temperatures.
Refer to the structure and bonding of each substance.
[6 marks]4 marksFoundation and Higher
A faulty gas heater burns methane in a limited supply of air.
.1Which two substances could form from incomplete combustion but not from complete combustion? Tick two boxes.
[2 marks] .2Explain why carbon monoxide from a faulty heater is dangerous.
[2 marks] 4 marksFoundation and Higher
A student heats 2.40 g of magnesium ribbon in an open crucible. It all reacts to form 4.00 g of magnesium oxide.
2Mg+O2→2MgO.1Calculate the mass of oxygen that reacted with the magnesium.
[1 mark] .2The student says: "The mass went up, so mass was not conserved."
Explain why the student is wrong.
[2 marks] .3The student repeats the experiment in a sealed container full of air and weighs the whole container. Predict what happens to the total mass.
[1 mark] 