Year 8 Semester 2 Revision Flashcards
Chemical Properties
It is a type of substance that you can see/observe that does not change the chemical matter or has the same matter.
Eg Some examples of chemical properties are vapor, energy level, electric charge and toxicity.
Physical Properties
It is a matter that can be observed and measured without changing the physical matter.
Eg Some examples of physical properties are the smell, taste, touch, hearing, the appearance, colour, texture, odor and the weight of the substance/matter/objects.
Chemical Reaction
It is when a substance chemical changes from one or more chemicals are produce or made.
Reactants
It is when a substance takes part or undergoes through a chemical change.
Products
It is the new chemical substance that came or resulted from a chemical reaction.
Precipitate
It is a solid substance or product that came or resulted from a chemical reaction which can not dissolve in water.
Reaction Rate
The speed of the reaction occurred or took place.
Catalyst
It is the chemical that helps it start or speed up a chemical reaction but is still stayed there once the reaction has finished.
Rusting
It is the corrosion of the iron and it turns to a reddish orange colour.
Corrosion
It is a chemical reaction that wears away metal by exposing the metal to oxygen and water.
Rust
It is a reddish orange colour that is formed when a metal is exposed to oxygen and water.
Surface protection
It is the coating of metal to prevent or stop corrosion occurring on metals.
Galvanising
It is when you are protecting metal by covering it with more reactive metal that will corrode first and protect the other metal.
Burning
It is a combination of substance with oxygen to form a flame.
Oxidation
It was a chemical reaction which involving the loss of electrons by a substance
Fossil fuel
It is substances such as oil and coal which is produce from the remains of ancient organisms.
Combustion
It is the process of combining oxygen, most commonly burning with a flame.
What is digestion?
Digestion involves the breaking down of food so that the nutrients it contains can be absorbed into your blood and carried to each cell in your body.
What are the five key processes in supplying nutrients to cells?
- ingestion
- mechanical digestion
- chemical digestion
- absorption of the broken-down food into your cells 5. assimilation
What do teeth do?
Bite and chew food to break it down to smaller pieces.
What does saliva do?
Secretes enzymes from the saliva glands which begins the chemical digestion of some carbohydrates.
List the order of the organs in the digestive systems, in terms of when you first put food into the body to when waste comes out.
Mouth Oesophagus Stomach Small Intestine Large Intestine Anus
Peristalsis
Is the process of pushing food along the oesophagus or small intestine by the action of muscles
Villi are
Tiny finger-like projections from the wall of the intestine that maximize the surface area of the structure to increase the efficiency of nutrient absorption.
