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Combined and Co-ordinated Sciences (Chemistry)
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Why are these hydrangea flowers different colors?
Each one is a pH indicator.
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How can excessively acidic soil be dealt with?
It can be neutralized with lime (calcium oxide, calcium hydroxide, calcium carbonate=limestone, or chalk).
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Which gas fills bags of chips and snacks to make sure the food doesn't go rancid from exposure to oxygen?
nitrogen
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Why might someone swallow the insoluble magnesium hydroxide?
It is an antacid.
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What is KOH?
caustic potash (potassium hydroxide)
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Alkalis feel _____ to the skin (They convert the oils in your skin into _______).
soapy/soap
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Which letter is bases and which letter is alkalis?
A is alkalis. B is bases.
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What substance has the formula NH3?
ammonia
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Name one of the substances commonly referred to as "lime".
calcium oxide, calcium hydroxide, calcium carbonate=limestone, or chalk
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What do ALL metal oxides and hydroxides do?
They all neutralize acids, whether soluble or not. They are bases.
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What kind of reaction occurs when an acid is mixed with a base?
a neutralization reaction
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What is the formula for lye (caustic soda)?
NaOH (used in making paper, soaps, and in cleaners)
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What is NaOH?
sodium hydroxide (lye)
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Each plant grows best in certain pH soils. Which prefers more acidic soil, potatoes or onion?
potatoes (prefer 4.5-6.0, whereas onions prefer 6.0-7.5)
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The atmosphere is 78% nitrogen and 21% oxygen. Name the next three most common gases.
argon (.9%) carbon dioxide (.04%) neon (.002%)...water vapor also OK (0%-3%)
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Which gas is used in the Haber process to manufacture ammonia and fertilizers?
nitrogen
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What is the formula for limewater?
CaOH (calcium hydroxide)
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What is the formula for ammonia?
NH3
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Most bases are insoluble in water. Name a common alkali, a base that IS soluble.
sodium hydroxide, potassium hydroxide, calcium hydroxide (limewater), ammonia (ammonium hydroxide)
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What do you call a base that is soluble in water?
an alkali
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A flue-gas desulfurizer reduces emissions of what gas?
sulfur dioxide
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What do factories have to spray acidic waste with jets of slaked lime before the gases leave the chimneys?
a flue-gas desulfurizer
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How can excessively alkaline soil be handled?
Add peat, compost or manure
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How can we summarize a neutralization reaction?
acid + base -> salt + water
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What is the formula for caustic potash?
KOH (used in making soap)
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