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Chemistry iGCSE - Chemical Formulae, Equations, Calculations -1

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sam bailey
Flashcards by sam bailey, updated more than 1 year ago
sam bailey
Created by sam bailey almost 2 years ago
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Question Answer
where heat is applied.
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What is the purpose of the ice?
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to condense the (water) vapour / steam
(3)
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The name of the salt formed in the student’s experiment is zinc sulfate zinc sulfide zinc sulfite zinc sulfur
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zinc sulfate
The student could have used two other metals in this experiment to make hydrogen. copper iron magnesium potassium silver
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iron magnesium
Describe a test to show that the gas collected is hydrogen.
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use burning flame to see if pop/squeak
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2 (1) 2
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hydrated
When the product in equation 1 is gently heated, another reaction occurs. Equation 2 represents this reaction. What do equations 1 and 2 suggest about the reactions?
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reversible or can go in both directions or can go backwards and forwards
Give the name of this piece of apparatus.
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measuring cylinder
What volume of hydrochloric acid is in the apparatus? (2)
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Use the volume of hydrochloric acid in the apparatus to calculate the amount, in moles, of hydrochloric acid in the apparatus.
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What effect would this change have on the rate at which the hydrogen is given off?
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(rate) increases/faster reaction
What effect would this change have on the volume of hydrogen produced?
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no effect/same volume (of hydrogen) produced
Look at question 5 on the paper, it's worth 8 marks 8 MARKS!!
In 1774, the scientist Joseph Priestley produced oxygen by heating mercury (II) oxide, (HgO). When heated, mercury (II) oxide breaks down into its elements. Write a chemical equation for the breakdown of mercury (II) oxide into its elements.
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In 1774, the scientist Joseph Priestley produced oxygen by heating mercury (II) oxide, (HgO). When heated, mercury (II) oxide breaks down into its elements. What name is given to this type of reaction? redox
Give the name of the apparatus that contains the hydrogen peroxide solution.
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funnel
Suggest how the first sample of gas collected may be different from the samples collected later.
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the gas contains air from the conical flask
A catalyst increases the rate of decomposition of the hydrogen peroxide. Describe a method you could use to show that the manganese(IV) oxide is acting as a catalyst in this reaction.
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Write a chemical equation for the reaction that takes place when sulfur dioxide dissolves in water.
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Universal indicator is added to the solution formed in (d)(i). Explain the effect that the solution has on the universal indicator.
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