Chemical Changes Flashcards
What is cellular respiration?
A process which living cells of plants and animals take in oxygen to release the energy stored in the glucose.
Describe the composition of air.
78% is nitrogen.
21% is oxygen
1% is carbon dioxide and water vapor etc…
What is the word equation for cellular respiration in plants?
glucose + oxygen -> carbon dioxide + water
What is the word equation for photosynthesis in plants?
Carbon dioxide + water -> glucose + oxygen
What is the difference between cellular respiration and photosynthesis?
Photosynthesis requires the presence of light to perform the chemical change, while cellular respiration requires the presence of oxygen.
Photosynthesis converts carbon dioxide and water into oxygen and glucose, while cellular respiration converts oxygen and glucose into water and carbon dioxide.
What is something to take note about decomposition?
It has only 1 reactant that produces 2 products.
What is photosynthesis?
A process which green plants make food in the presence of sunlight.
What is M.O.L.E.H?
Mixing, Oxygen/oxidation, Light, Electricity and Heat
They are all types of chemical changes.
What is the difference between physical change and chemical changes?
Physical changes can be reversible while chemical change cannot be reversed easily.
Chemical changes produce new substances while physical change does not produce new substance.
The properties of the physical remain the same while the properties of the products in a chemical change is different from that of the reactants.
Chemical change causes the rearrangement of elements in reactants to form products while physical change doesn’t.
What is electrolysis?
It is a chemical decomposition of substances with the passage of an electric current.
Is the exposure of film in the presence of light considered a decomposition?
Yes, silver bromide would be broken down into silver and bromine.
Must heat be involve in a physical change of matter?
No.
Which of the following is an example of combustion?
1) hydrogen = chlorine -> hydrogen bromide
2) Hydrogen + oxygen -> water vapour
3) Iron + oxygen -> iron (III) oxide
2) is the answer.
3) cannot be the answer as it is oxidation.
Which of the following chemical term is used correctly to describe the change of potassium chloride into potassium and chlorine gas by using electricity?
Electrolysis.
Explain why rotten fruits is a chemical change?
It is because the change is permanent and the new product made is the rotten food.
