Acids
BONUS 500 Points!
Name 3 properties of acids
Tastes sour
Preserves things
Contains H at the front
Reacts with metals and carbonates
Name 3 properties of bases.
Taste bitter
Feel slippery
Contain a hydroxide group (OH)
Accept hydrogen atom
What is another name for "basic"?
alkaline
What does it mean to neutralize a solution?
mix acid and base to make neutral pH
What is a chemical equation?
A way to describe a chemical change using symbols instead of words.
On the pH scale, which numbers indicate that a substance is acidic?
0-6
What color would a pH test strip turn if dipped in an extremely basic substance?
Purple or dark blue
Give an example of an acid in everyday life.
stomach acid
lemon juice
What is the definition of a salt?
metal bonded to a nonmetal
Is boiling water an example of a chemical or physical change?
Physical change! No new substance was created.
How do we define an acid?
A substance that donates a hydrogen atom
Give an example of a very basic liquid.
Cleaning products!
I dip pH paper in a solution and it comes out green. Is the solution acidic, basic, or neutral?
neutral
I have a purple substance that looks shiny and does not taste salty. Can it still be a salt? Why or why not?
Yes, not all salts have to be dull, white, and salty
BONUS 500 POINTS!
Describe the difference between a physical and a chemical change.
Physical change: The appearance changes but no bonds are broken.
Chemical change: Chemical bonds are broken and new molecules are formed!
Which of these is an acid? How do you know?
HCl NaOH
HCl; has an H in front
Bonus 500!
If a liquid has 5 hydrogen ions and 7 hydroxide ions, is it acidic or basic?
Basic!
What is an "indicator"? Give one example.
Changes color to tell how acidic or basic a substance is.
pH paper, cabbage juice
I just got stung by a wasp! Its venom has a pH of 9. What should I do to treat the sting?
Put an acid on it to neutralize the alkaline venom. Lemon juice or hydrogen peroxide or vinegar.
What is the Law of Conservation of Mass?
In a chemical reaction, no mass is created or destroyed.
The total mass of the reactants will be equal to the total mass of the products.
What color would the pH paper turn if dipped into an acid?
red
If Ca(OH)2 were placed in water, what would happen?
Ca would dissociate from OH.
Bananas have a pH of 5. Are they acidic or alkaline?
Slightly acidic
Why does toothpaste clean your teeth?
Its alkaline and neutralizes the acids on your teeth.
Balance the following equation:
CH4 + O2 --> CO2 + H2O
CH4 + 2O2 --> CO2 + 2H2O