Toggle Navigation
Games
Blog
News
Class PIN
Join for Free
Sign in
Toggle Navigation
Games
PIN
Join for Free
Blog
Pricing
News
Contact us
Help center
Sign in
Study
Combined and Co-ordinated Sciences (Chemistry)
0
%
0
0
0
Back
Restart
What substance has the formula NH3?
ammonia
Oops!
Okay!
What is the formula for limewater?
CaOH (calcium hydroxide)
Oops!
Okay!
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)
Oops!
Okay!
Why might someone swallow the insoluble magnesium hydroxide?
It is an antacid.
Oops!
Okay!
What is the formula for ammonia?
NH3
Oops!
Okay!
What is the formula for caustic potash?
KOH (used in making soap)
Oops!
Okay!
Alkalis feel _____ to the skin (They convert the oils in your skin into _______).
soapy/soap
Oops!
Okay!
Why are these hydrangea flowers different colors?
Each one is a pH indicator.
Oops!
Okay!
How can we summarize a neutralization reaction?
acid + base -> salt + water
Oops!
Okay!
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%)
Oops!
Okay!
What is the formula for lye (caustic soda)?
NaOH (used in making paper, soaps, and in cleaners)
Oops!
Okay!
Which gas is used in the Haber process to manufacture ammonia and fertilizers?
nitrogen
Oops!
Okay!
A flue-gas desulfurizer reduces emissions of what gas?
sulfur dioxide
Oops!
Okay!
What do ALL metal oxides and hydroxides do?
They all neutralize acids, whether soluble or not. They are bases.
Oops!
Okay!
What kind of reaction occurs when an acid is mixed with a base?
a neutralization reaction
Oops!
Okay!
How can excessively acidic soil be dealt with?
It can be neutralized with lime (calcium oxide, calcium hydroxide, calcium carbonate=limestone, or chalk).
Oops!
Okay!
What do factories have to spray acidic waste with jets of slaked lime before the gases leave the chimneys?
a flue-gas desulfurizer
Oops!
Okay!
What do you call a base that is soluble in water?
an alkali
Oops!
Okay!
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)
Oops!
Okay!
What is KOH?
caustic potash (potassium hydroxide)
Oops!
Okay!
Which gas fills bags of chips and snacks to make sure the food doesn't go rancid from exposure to oxygen?
nitrogen
Oops!
Okay!
Which letter is bases and which letter is alkalis?
A is alkalis. B is bases.
Oops!
Okay!
Name one of the substances commonly referred to as "lime".
calcium oxide, calcium hydroxide, calcium carbonate=limestone, or chalk
Oops!
Okay!
How can excessively alkaline soil be handled?
Add peat, compost or manure
Oops!
Okay!
What is NaOH?
sodium hydroxide (lye)
Oops!
Okay!
Your experience on this site will be improved by allowing cookies.
Allow cookies