1. Which gas used to freeze water . 2. which gas used to prevent food items . 3. What is pH of substances 4. What is neutralisation?
Answers
Answer:
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Explanation:
1.liquid nitrogen
2.nitrogen (N2), or carbon dioxide (CO2),
3.The reaction of an acid and a base is called neutralisation. In this reaction, the acidity of an acid is neutralised by an alkali. At the same time, the alkalinity of the alkali is neutralised by the acid. A salt and water are the only products of neutralisation.
GE1
or
GE2
Answer:
1. The temperature of liquid nitrogen can readily be reduced to its freezing point 63 K (−210 °C; −346 °F) by placing it in a vacuum chamber pumped by a vacuum pump.
2. pH is a measure of how acidic or basic a chemical is when it's in aqueous (water) solution. A neutral pH value (neither an acid nor a base) is 7. Substances with a pH greater than 7 up to 14 are considered bases.
3. When foods such as crisps are packaged, the bag's empty space is filled with an inert gas such as nitrogen to prevent the food spoiling too quickly. Gas is used to replace oxygen which causes food to oxidise, the chemical reaction that turns crisps stale and apples brown.
4. Slaked lime (calcium hydroxide) or limestone (calcium carbonate) may be worked into soil that is too acidic for plant growth. Fertilizers that improve plant growth are made by neutralizing sulfuric acid (H2SO4) or nitric acid (HNO3) with ammonia gas (NH3), making ammonium sulfate or ammonium nitrate.