Which technique is the best for separating pure water from a solution of sodium chloride in water?
Which statement shows that lead is a metal?
When
What mass of C would burn to form
What is the relative formula mass of sodium carbonate, Na2CO3?
The size of a nanoparticle is similar to the size of a molecule. What is the approximate size of a nanoparticle?
The bar chart shows the melting points of Group 1 elements.
Melting Point (°C)
What are the melting points of rubidium and caesium?
A student separates the colours of black ink using paper chromatography.
He puts a spot of black ink onto a piece of filter paper.
He dips the filter paper into ethanol in a beaker.
What phase describes ethanol in this experiment?
Look at the chromatogram.
What is the best description of the particles in a liquid?
Look at the energy changes in the reaction profile for the reaction between hydrogen and chlorine.
Which energy change shows the enthalpy change of reaction?
What is the empirical formula of decene?
Two isotopes of neon are
A hydrocarbon has a boiling point which is 3.5 times the boiling point of petrol. Which fraction contains the hydrocarbon?
A student measures the pH on an acid and an alkali.
He adds magnesium metal to the acid and to the alkali.
What results should he expect?
Which row in the list shows the correct results?
