3. A scientist compared the acidity of four gases to see which gas might cause acid rain. She used four balloons to collect the gases. She then bubbled the gases, in turn, through a fresh sample of green, neutral, universal indicator solution. (a) Three of the gases caused the indicator to change colour. The scientist added drops of alkali to the indicator until the indicator changed back to green. Her results are shown in the table below. gases collected change in colour of indicator number of drops of alkali needed to change the indicator back to green exhaust gases from a car green to red 31 carbon dioxide green to red 160 air no change 0 human breath green to yellow 10 Use information in the table to answer part (i) and part (ii) below. (i) Which gas dissolved to form the most acidic solution? Explain your choice.
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in turn, through a fresh sample of green
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Thunderstorms develop in hot and humid areas. High temperature in this areas cause hot humid (with water vapours) air to rise up. So, strong upward rising winds with water droplets are generated. ... Upward movement of air and downward movement of water drops, together, cause lightning
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