Acids and bases
How do acids taste?
How d bases taste?
Acids - sour
Bases - bitter
Neutral pH
7
General equation for acid and base reaction
Acid + base --> salt + water
Reactions that absorb heat energy
endothermic
The mass of reactants and products must be the same. What Law is this?
Law of Conservation of Mass
Name two acidic drinks
Coke,
Orange juice
(other correct)
Orange
Identify the products
Nitric acid + iron
Iron nitrate + hydrogen
Double prize!!!
Describe how you would test for the gas produced.
All combustion reaction are exothermic/endothermic
Exothermic
Double prize!!!
Explain your answer
Compounds always have the same ratio of elements. For example, carbon dioxide is always CO2
Which Law is this?
Law of Constant Proportions
Name two household bases
Toothpaste
Dishwashing liquid
Bleach
(Other correct)
What are the three colours of bases in UI (from weakest to strongest)
Blue --> Indigo --> Violet
Which acid produced these salts?
A) sodium sulphate
B) copper acetate
A) sulphuric acid
B) acetic acid
General equation for burning a candle
fuel + oxygen --> carbon dioxide + water
500 kg of wood is completely burned with 20 kg of oxygen
What is the total mass of the products?
Double Prize!!!
Name the products.
Name a strong acid
Hydrochloric acid
sulphuric acid
(other correct)
The reaction of turning a ph 1 solution to a pH 7 solution is called
Neutralisation
Identify the reactants
--> sodium chloride + carbon dioxide + water
sodium carbonate + hydrochloric acid
Write the word equation for burning iron with oxygen
iron + oxygen --> iron oxide
30 grams of nitric acid reacts with 10 grams of sodium carbonate.
The resulting solution only has a mass of 36 grams. Account for the difference between the mass of reactants and products
4 grams of carbon dioxide escape
What property is similar between acids and bases
Both are corrosive
An ant bite hurts because of formic acid. Which substance will most likely ease the pain.
A) lemon juice
B) tap water
C) vinegar
D) Soap
D) Soap
Double prize!!!
Explain your answer.
Fill in the blanks
lead __A__ + __B__ acid --> _C_ citrate + water
A) hydroxide (or oxide)
B) citric acid
C) lead
A reaction occurs in a test tube. Beads of water start to form on the outside of the test tube. What type of reaction is it?
Endothermic
To defend raising livestock, farmers claim:
- methane given off from cows has fewer carbon atoms than the methane given off by oil refineries.
- thus, methane from cows is not as bad for the climate as methane from oil refineries.
Can this be true? Briefly explain
No. The Law of Constant Proportions states that methane will always have the same relative amounts of each element, no matter how it is produced.
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Fact Check: The 'claim' was completely made up for this question. Farmers don't claim this :)