biology, chemistry, physics Flashcards
nucleus?
controls the cells activity
mitochondria?
this is where aerobic respiration takes place
choloroplast?
this is where photosynthesis occurs
permanent vacuole?
where the cell sap is stored
ribosomes?
where the protein is made
cytoplasm?
where the chemical reactions take place
cell wall?
supports the cell
cell membrane?
controls what goes in and out of the cell
plasmid?
circular loop of dna
prokaryotic cell?
cell with no nucleus
eukaryotic cell?
cell with a nucleus
sperm cell?
passes on biological information by swimming towards to egg cell (this is called fertilization)
red blood cell?
contains protein that helps carry oxygen from lungs to the rest of the body and has no nucleus
egg cell?
reproduces offsprings
nerve cell?
have long fibre called axon that can carry messages to your brain
muscle cell?
muscle contraction
root hair cell?
absorbs water and mineral from plants
specialised cell?
a cell that has a specific job to carry out
magnification?
enlarging a physical apperance
compounds?
contains 1 type of element chemically bonded together
elements?
contains 1 type of element
chromotography?
separation of solutes in a solvent
what does chromatography separate?
colour dyes
how do you carry out chromatography?
- put spots of dye on chromatography paper
- dye would travel up the paper
- the separation can be told by the RF value
how do you work out the RF value?
distance moved by substance//distance moved by solvent
what colour does the litmus paper go if chlorine is present?
white, it would get bleached
2 phases of chromatography?
measuring phase (measuring the RF VALUE) and separating phase (separating the dyes)
how do you test for oxygen?
- use a glowing splint
- insert into test tube
- the splint with relight if oxygen is present
how do you test for chlorine gas?
blue litmus paper bleaches white if chlorine is present
how do you test for carbon dioxide?
limewater turns milky if hydrogen gas is produced
how do you test for hydrogen gas?
place a lighted splint in test tube. if hydrogen is present it produces a squeaky pop sound
what is active transport?
movement of particles
what is osmosis?
movement of water from a low concentration to a high concentration
what is mitosis?
-cell division
what is a pure substance?
made of 1 atom and 1 particle
how can you distinguish a pure substance from a impure substance?
the boiling point and the melting point
what is a formulation?
a mixture that is useful
what are everyday formulations?
- paint
- food
- medicine
- fuels
- fertilisers
- alloys
describe how sodium thiosulfate can react with hydrochloric acid in a practical?
flash is put over a paper with a large x
once the reactants are mixed, the x will start to disappear
time it
the reaction should look black
what is a catalyst?
a substance that changes the speed of a reaction but doesn’t affect the reaction
a reversible reaction is endothermic in one direction and …
exothermic in the other
on a graph if there’s curve it means…
the reaction slowed down
what does it mean if a reaction is in equilibrium?
the position moves
what happens to particles if they are heated?
they get more energetic
