6.2. Rate of reaction
A subsection of Chemistry, 0620, through 6. Chemical reactions
Listing 10 of 319 questions
A student investigated the reaction between zinc and dilute hydrochloric acid by measuring the volume of hydrogen gas produced at one minute intervals. Zn + 2HCl ZnCl 2 + H2 Give the name of the salt formed in this reaction. The graph shows the results using small pieces of zinc and dilute hydrochloric acid. volume of hydrogen gas / cm3 time / minutes Deduce the volume of hydrogen gas produced in the first two minutes of the reaction.  cm3 Draw a letter S on the graph to show where the reaction is slowing down but has not stopped completely. Draw a line on the grid to show how the volume of hydrogen gas changes with time when the reaction is repeated with a catalyst. All other conditions are kept the same. What effect do the following have on the rate of this reaction? ● Decreasing the temperature at which the reaction is done. All other conditions are kept the same. ● Using zinc powder instead of small pieces of zinc. All other conditions are kept the same.  Describe a test for hydrogen. test result  The table gives some information about the rate of reaction of zinc and some other metals with cold water and with steam. metal rate of reaction with cold water with steam iron no reaction hot iron reacts very slowly magnesium reacts very slowly hot magnesium reacts rapidly mercury no reaction no reaction strontium reacts rapidly reacts rapidly zinc no reaction hot zinc reacts slowly Put the five metals in order of their reactivity. Put the most reactive metal at the top. most reactive least reactive  When 13.0 g of zinc reacts completely with sulfur, 19.4 g of zinc sulfide is formed. Calculate the maximum mass of zinc sulfide formed when 3.25 g of zinc reacts completely with sulfur.  mass of zinc sulfide formed = g 
0620_m19_qp_32
THEORY
2019
Paper 3, Variant 2
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This question is about the reactions of magnesium with nitricacid. The equation for the reaction of magnesium with concentrated nitricacid is shown. Mg + 4HNO3 → Mg(NO3)2 + 2NO2 + 2H2O The reaction is exothermic. What is the meaning of the term exothermic? Which word best describes the compound Mg(NO3)2? Draw a circle around the correct answer. acid base oxide salt Oxides of nitrogen are formed when fossil fuels are burned. What type of chemical reaction occurs when fossil fuels are burned? Draw a circle around the correct answer. combustion cracking fermentation neutralisation Oxides of nitrogen dissolve in rain water to form acid rain. State one adverse effect of acid rain on buildings. When very dilute nitricacid reacts with magnesium powder, hydrogen is produced. Describe a practical method for investigating the rate of this reaction. What effect would each of the following have on the rate of this reaction? ● ● Larger pieces of magnesium are used instead of magnesium powder. All other conditions stay the same. ● ● The temperature of the reaction mixture is increased. All other conditions stay the same.  
0620_m20_qp_32
THEORY
2020
Paper 3, Variant 2
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319