Test Revision Flashcards
List as many facts about bases as possible
bitter Slippery May be corrosive Neutralised by acids Affect the colour of certain dyes Ph is greater than 7
On which side of the equation is the reactants?
Left
Which number range on the ph scale would a weak acid have?
Ph 3-6
Explain how a cold pack works
Cold packs work to draw heat out of an injury and reduce swelling and bruising
List as many facts about acids as possible
Sour Corrosive Dissolve in water to produce hydrogen Neutralised by bases Affect the colour of some dyes Ph is less than 7
An example of a substance with a ph of 7
Uncontaminated water
On which side of the equation do the products appear?
Right
List as many examples of acids as possible
Stomach acid Nitric acid Battery acid Carbonic acid Phosphoric acid Vinegar Citric acid
Do the products of an exoteric reaction have more or less energy than the reactants?
Exothermic reactions produce energy so there is more energy in the products
What number range, on the ph scale would a strong base have
Ph 10-14
What are the types of chemical reactions?
Synthesis Decomposition Single replacement Double replacement Combustion
What is synthesis?
A+B->AB
2 becomes 1
What is decomposition?
AB->A+B
1 becomes 2
What is single replacement?
A+BC->B+AC
A+BC->C+BA
Loners got a friend
What is double replacement?
AB+CD->CB+AD
Wife swap
What is combustion?
CH4 + 2O2 -> 2H2O + CO2
C3H3 + 5O2 -> 4H2O + 3CO2
Organic compounds react with oxygen to form carbon dioxide and water
What number range on the ph scale would a weak base have?
Ph 7-10
What is an endothermic reaction?
A reaction that needs energy to start so it would have more energy in the reactants
What are some examples of bases?
Sodium hydroxide Potassium hydroxide Calcium hydroxide Calcium carbonate Sodium carbonate Calcium bicarbonate Ammonia Ammonium hydroxide
Is a chemical reaction the same thing as a physical reaction?
A chemical reaction is a permanent change where as physical changes are reversible
What is the law of conservation of mass?
When matter cannot be created or destroyed in a chemical reaction, just rearranged
What is an example of a chemical reaction
Baking a cake because you cannot separate the components again
What is an exothermic reaction?
When energy is released from a reaction, that is, there is more energy in the products than the reactants
In what number range on the ph scale would pure water be?
If it it completely pure- ph7
Does potassium nitrate cause an endothermic reaction or an exothermic reaction?
Endothermic reaction
An example of a physical reaction
Water evaporating because it is only a change of state and is reversible
What is cellular respiration?
The conversion of glucose into energy- the oxidisation of glucose- the opposite of photosynthesis
What number range on the ph scale would a strong acid be?
Ph 0-3
What is photosynthesis?
The opposite to cellular respiration, the process by which plants, some bacteria and some protistans use sunlight energy to produce glucose from carbon dioxide and water
Do the products of an endothermic reaction have more or less energy than the reactants?
Reactants
Does calcium chloride cause an endothermic or exothermic reaction?
Endothermic
How does a hot pack work?
Hot packs help to relieve pain by stimulating your sensory receptors to block pain signals to the brain
What is the best way to combat the swelling of a rolled ankle?
Use RICE: rest, ice, compression &a elevation. The ice, compression and elevation reduce the amount of blood rushing to the are to reduce the amount of swelling, bruising and long term pain
