10.3. Air quality and climate
A subsection of Chemistry, 0620, through 10. Chemistry of the environment
Listing 10 of 389 questions
This question is about gases. The following substances are gases at room temperature. letter A B C D E F G H substance SO2 Ar CO Cl 2 NH3 CO2 CH4 C3H8 Identify, by letter: a gas which combines with water to form acid rain two gases which exist as diatomic molecules a gas which bleaches damp litmus paper a gas which is used as an inert atmosphere in lamps two gases which are found in clean dry air two gases which are found in refinery gas. NF3 has covalent bonds. What is a covalent bond? Complete the dot-and-cross diagram to show the electron arrangement in a molecule of NF3. Show outer shell electrons only. N F F F  Air is a mixture. Nitrogen and oxygen are the two most common gases in air. What is meant by the term mixture? State the percentage of oxygen, to the nearest whole number, in clean dry air. Describe the steps in the industrial process which enables nitrogen and oxygen to be separated from clean dry air. Use scientific terms in your answer. Which physical property of nitrogen and oxygen allows them to be separated? 
0620_m18_qp_42
THEORY
2018
Paper 4, Variant 2
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