B2 C2 P2

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  • Created by: Sarah
  • Created on: 22-05-13 18:28
What is Nuclear fusion?
joining together of two or more atomic nuclei to form a larger atomic nucleus
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What is a half-life of a radioactive isotope?
a measurement of time it takes for the rate of decay (count-rate) to halve
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What's terminal velocity?
resultant force becomes 0 as the weight and resistive forces balance.. steady speed
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equation for acceleration?
acceleration = change in velocity/time difference
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What is an alloy?
A mixture that contains a metal and at least one other element to improve properties
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Why do polymers have different properties?
different catalysts and temparatures and conditions used
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An ionic bond occurs between what?
a metal and a non-metal
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A covalent bond gives away electrons or shares a pair?
Shares a pair of electrons
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What is tissue?
A group of similar/same cells grouped together
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3 plant organs?
stem, roots, leaf
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3 factors affecting photosynthesis?
temparature, Carbon dioxide concentration and light intensity
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Aerobic respiration equation?
Glucose + Oxygen -> Carbon dioxide + Water + Energy can be remembered as GO=CWE
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What is the stopping distance?
Distance covered in the time between the driver spottin hazard&vehicle coming to a stop
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Factors that affect the braking distance?
How, dopey, how fast you're going, how good tyres, how good the grip is
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What happens when a force moves an object through a distance?
Energy is transferred and work is done
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Formula for work done and units?
WD (J) = Force (Newtons) x Distance (m)
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What is the gravitational field strength of earth?
10N
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Gravitational potential energy formula and units?
GPE= mass (kg) x height (m) x gravity (always 10N)
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What is it called when an elastic object takes a maximum force until its not directly proportional anymore?
Limit of proportionality
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The greater the resistance across a component the...?
smaller the current
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What does resistance increase of and why?
Temperature, resistance increases with temperature, energy transferred to heat the ions vibrate more, this makes it harder for the electrons to get through the resistor
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What is the UK mains supply in Volts?
230 volts
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What temperature do enzymes in the body work best at?
37
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What is a catalyst?
a substance that increases the speed of a reaction without being changed or used up in the reaction
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Where is bile produced, stored and released into?
produced- liver. stored- gall bladder. released into- the small intestine.
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What is respiration?
respiration is the process of releasing energy from glucose which goes on in every cell
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What do amylase covert starch into? wheres it made?
Sugars. Made in the 1) pancreas 2) small intestine 3) the salivary gland
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what do protease convert proteins into where are they found?
Amino acids. Found in: 1) small intestine 2) pancreas 3) stomach (called pepsin there)
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What does bile do?
it neutralises the stomach acid and emulsifies fats
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Why does the stomach produce hydrochloric acid?
1) to kill bacteria 2) to give the right pH for the protease enzymes to work (pH 2- acidic)
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What do animal cells have?
Nucleus, cytoplasm, cell membrane, mitochondria and ribosomes
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what are mitochondria and ribosomes?
Mitochondria- where most of the reactions for respiration take place. ribosomes- where proteins are made in the cell
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What is diffusion?
The spreading out of particles from an area of high concentration to low concentration
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Equation for photosynthesis?
CW=GO Carbon dioxide+Water --light---> Glucose + oxygen
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What is the pigment that absorbs oxygen?
haemoglobin
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Why does temperature increase the rate of reaction?
the particles get more energy+move faster, the particles collide more frequently,more sucessful collisions= enough activation energy
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What is the ionic neutralization reaction?
H+ + OH- -> H20
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Advantages of gas chromotography over paper chromotography?
sensitive (detects small amounts), fast, accurate
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What information does mass spectroscopy give?
identifies substances, relative molecular mass
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Why are stars stable for the 'main sequence' period of the life cycle?
forces within the star are balanced
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What isthe difference between a prostar and main sequence star?
a prostar hhas lower temperatures, emits less radiation as fusion reactions have not started
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Other cards in this set

Card 2

Front

What is a half-life of a radioactive isotope?

Back

a measurement of time it takes for the rate of decay (count-rate) to halve

Card 3

Front

What's terminal velocity?

Back

Preview of the front of card 3

Card 4

Front

equation for acceleration?

Back

Preview of the front of card 4

Card 5

Front

What is an alloy?

Back

Preview of the front of card 5
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Comments

AmberFDavies

this is so useful

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