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Teams
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lifesaver
Give 15 points!
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seesaw
Swap points!
Okay!
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gift
Win 20 points!
Okay!
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lifesaver
Give 20 points!
Oops!
15
×
What adjective is the opposite of "dilute"?
concentrated
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eraser
Reset score!
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magnet
Take 10 points!
Okay!
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rocket
Go to first place!
Okay!
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banana
Go to last place!
Oops!
15
×
A substance contains an excess of OH- ions. What is its pH?
It is alkaline, so it is higher than 7.
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25
×
What does "pH" actually stand for, anyway?!?!
The German "potenz H(ydrogen)", which means the power of the hydrogen-ion concentration.
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baam
Lose 20 points!
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fairy
Take points!
5
10
15
20
25
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fairy
Take points!
5
10
15
20
25
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banana
Go to last place!
Oops!
15
×
The acidic oxides of sulfur, phosphorus, and carbon produce acids when dissolved in water. When pure, they are ________ molecules.
covalent
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15
×
Name a pH indicator other than litmus or Universal Indicator.
methyl orange or phenolphthalein (also hydrangea flowers, turmeric, and anthocyanins)
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15
×
Alkalis turn litmus paper ______.
blue
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15
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What is the most accurate method to measure pH?
Use a pH meter which uses an electrode to measure pH electrically.
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15
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Alkalis have a pH _________ than __.
greater than 7
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15
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Acids have a pH of _____ than __.
less than 7
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15
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Acids turn litmus paper _____.
red
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15
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Universal Indicator is green in the presence of a substance. What does this indicate?
The substance is neutral.
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15
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A substance contains an excess of H+ ions. What is its pH?
It is acidic, so it is lower than 7.
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15
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How can we use litmus paper to test the pH of gases?
The litmus paper must be damp.
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