10 questions
The energy level diagram for the reaction between magnesium and hydrochloric acid is shown.
Energy is given out during the reaction
The products are at a lower energy level than the reactants
The reaction is endothermic.
Which reaction is endothermic?
acid neutralising alkali causing a temperature increase
adding magnesium to hydrochloric acid
calcium carbonate decomposing when heated combustion of fossil fuels
Which statements about exothermic and endothermic reactions are correct?
During an exothermic reaction, heat is given out
The temperature of an endothermic reaction goes up because heat is taken in
Burning methane in the air is an exothermic reaction
Which is an endothermic process?
Burning hydrogen
Distilling petroleum
Reacting potassium with water
Using petrol in a motor car engine
A power station was designed to burn gaseous fuels only. Which two substances could be used?
carbon dioxide and hydrogen
carbon dioxide and 235U
Hydrogen and Methane
Which fuel does not produce carbon dioxide when it burns?
Coal
Hydrogen
Methane
Which substance is not a fossil fuel?
coal
kerosene
wood
Statement 1 Hydrogen is used as a fuel.
Statement 2 When hydrogen burns in the air to form water, heat energy is produced.
Which is correct?
Both statements are correct and statement 2 explains statement 1
Both statements are correct but statement 2 does not explain statement 1
C Statement 1 is correct but statement 2 is incorrect
. Which substance does not require oxygen in order to produce energy?
Coal
235U
Natural gas
Some white anhydrous copper(II) sulfate powder is put into a beaker of water and stirred. What would show that the process was exothermic?
A blue solution is formed
The beaker feels cooler
The beaker feels warmer