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Pitanje 3
3.
This question is about Group 7, the halogens. (a) Which halogen has the palest colour
(b) Which halogen is a solid at room temperature?
(d) Lithium reacts with chlorine to form lithium chloride. (i) Write a chemical equation for the reaction of lithium with chlorine
This question is about gases in the atmosphere.
(a) Use the gases underneath to answer the following questions. Each gas may be used once, more than once or not at all.
Argon, carbon dioxide, helium, nitrogen, oxygen
(i) Identify the two noble gases.
(ii) Identify the gas that is a compound.
(iii) Identify the most abundant gas in the atmosphere.
(iv) Identify the greenhouse gas.
(b) Describe the test for oxygen.
This question is about the reactions of iron. (a) Iron rusts when exposed to water and oxygen.
(i) Give the chemical name of the compound that forms when iron rusts.
(ii) What type of reaction occurs when iron rusts?
(iii) Galvanising is a method used to prevent iron from rusting. Give the name of the metal used to galvanise iron.
(b) When iron reacts with dilute sulfuric acid, the products are iron(II) sulfate and hydrogen.
(i) Give a chemical equation for the reaction between iron and sulfuric acid.