Physics
Chemistry
Biology
Energy and Forces
Energy Circuits
100
What are the SI units for these:
distance?
speed?
distance: metres
speed: metres per second
100
What is activation energy?
The minimum amount of energy required for a chemical reaction
100
What does DNA stand for?
Deoxyribonucleic acid
100
What are non contact forces?
Forces that occur between two objects that are not physically touching
100
What is current?
The rate at which electrical charge is flowing
200
What is inertia?
Linked to Newton's first law. the tendency of an object in motion to stay in motion and an object at rest to stay at rest unless acted on by an unbalanced force.
200
What is the equation for a neutralisation reaction?
Acid + Base --> Salt + Water
200
What are the bonds in DNA?
Adenine and Thymine
Guanine and Cytosine
200
What are contact forces?
Forces where they are physically touching
200
What is voltage?
The amount of energy being pushed
300
What is Newton's 3rd Law?
Every action has an equal and opposite reaction.
300
Outline the 4 factors affecting rate of reaction.
Temperature (higher temperature causes particles to move faster, causing more frequent and higher energy collisions)
Concentration/pressure (more particles in a small space increases likelihood of successful collisions)
Catalysts (provide energy, speeding up reactions without changing the products)
Surface area (higher surface area allows more particles to collide at the same time. This is why powders react faster than solids)
300
What is mitosis?
A process where a cell replicates its DNA, then divides its nucleus into two. Results in two identical daughter cells.
300
What are the 6 most common contact forces?
Tension
Friction
Air resistance/drag
upthrust
thrust
normal reaction force
300
Compare alternating and direct current
Alternating current periodically reverses direction and changes magnitude.
Direct current has one directional flow of electric charge
400
What is the difference between vectors and scalars? Give examples.
Vectors have a magnitude and direction, such as acceleration.
Scalaras only have a magnitude, such as mass.
400
What is the equation for cellular respiration?
Glucose + oxygen --> carbon dioxide + water + ATP
400
What is meiosis?
Cell division resulting in 4 non-identical daughter cells. PMAT occurs twice
400
Name the three main types of non contact forces.
Magnetic
Electrostatic
Gravitational
400
What 4 things does an electrical circuit need?
load/component
conducting path
control/switch
power supply
500
What does this image represent?
Stationary
500
Outline collision theory
States that for a reaction to occur, particles must collide, with enough energy, at the right orientation.
A collision is defined as two molecules approaching close enough to disturb chemical bonds, allowing new ones to be formed.
500
What is incomplete dominance and co-dominance?
incomplete = phenotype appears as a blend of each allele. (eg beige cows)
co = both phenotypes of both alleles are expressed, neither dominant over the other. (eg spots on a cow)
500
What is the difference between energy transfer and energy transformation?
Energy transfer moves locations, energy transformation is when it changes types
500
What is the difference between conventional current and electron flow?
Conventional current (incorrect): flows from positive to negative terminals
Electron flow (correct): flows from negative to positive terminals