The acidic oxides of sulfur, phosphorus, and carbon produce acids when dissolved in water. When pure, they are ________ molecules.
covalent
A substance contains an excess of OH- ions. What is its pH?
It is alkaline, so it is higher than 7.
Metals form oxides that are solids. If they dissolve in water, these oxides give _______ solutions.
alkaline
What is an OH- ion called?
a hydroxide ion
What kind of acid is in the atmosphere of Venus?
sulphuric acid (due to volcanic activity)
What does "pH" actually stand for, anyway?!?!
The German "potenz H(ydrogen)", which means the power of the hydrogen-ion concentration.
Alkalis turn litmus paper ______.
blue
Non-metals generally form _______ oxides that dissolve in water to form _______ solutions.
acidic
The more acidic the solution, the ______ the pH.
lower
What adjective is the opposite of "dilute"?
concentrated
Give an exception to the rule that "Oxides of non-metals are acidic oxides."
Water. It can be considered hydrogen oxide and a neutral oxide.
How can we use litmus paper to test the pH of gases?
The litmus paper must be damp.
What adjective means "can eat through material"
corrosive
What is the most accurate method to measure pH?
Use a pH meter which uses an electrode to measure pH electrically.
A substance contains an excess of H+ ions. What is its pH?
It is acidic, so it is lower than 7.
What acid is present in vinegar?
acetic acid (ethanoic acid)
Universal Indicator is green in the presence of a substance. What does this indicate?
The substance is neutral.
A substance turns the Universal Indicator bright red. What does this "indicate"?
It is very acidic.
Acids have a pH of _____ than __.
less than 7
Name a pH indicator other than litmus or Universal Indicator.
methyl orange or phenolphthalein (also hydrangea flowers, turmeric, and anthocyanins)
What adjective is the opposite of "concentrated"?
dilute
Acids turn litmus paper _____.
red
Which acid is present in orange juice?
citric acid
Alkalis have a pH _________ than __.
greater than 7