Y9 How Fast... Flashcards
(17 cards)
Independent variable defenition
The variables you change to see what happens.
Control variable defenition
A variable that must be kept the same to prevent it effecting your result
Dependent variable
The variable you measure.
Define variable
A variable is anything that can change and be measured.
What is the activarion energy
It is the minimum energy needed for a reaction to take place
Is temperature of the acid a continuous va riable or a categor ic
va riable?
Continuous variable
Is time taken for the reaction to complete a continuous va iable or
a catego ic va iable?
Continuos variable
What is a catalyst?
A catalyst something that provides an alternet pathway that requires lower activation energy without being used up
How to increase surface area?
Cut up reactants.
What is the two rules for rate of reactions?
Quantity of reactants used / time taken or
Quantity of reactants formed / time taken.
Units for chemical reaction
G/s of cm^3/s
How do you draw a tangent
Find a point that you want to find the rate of reaction at then draw a line making sure the angles are the same and draw a 90degree angle thne find the what they are and divide by the straight up one by the horizontal
What is red shift?
It refers to the increase of of wavelength (moving toward red) of light from the object miving away from the observer. This is one of the pieces of eidance that supports big bang theory
3 pieces of evidance with explanation for the big bamh theory
CMBR cosmic microwave background radiation, he CMB is faint microwave radiation detected in all directions of space.This radiation is a snapshot of the early universe and its uniform presence and temperature distribution match predictions made by the Big Bang model.
Red shift of galaxies,This red shift indicates that the universe is expanding, which aligns with the idea that it started from a single point and has been growing ever since.
Abundance of light elements,Observations of old stars and gas clouds show exactly the same element ratios predicted by the theory, supporting the idea of a hot, dense origin.
What is the shape of oirbits
Eliptical
Ahat determines wether a star become s neutron star or black hole?
The mass of the stars core
What is the steady state theory?
The theory that the universe has always existed . As the universe expands new mater is constantly created. There is no beginning nor end. This has been disproved by cmb radiation which keans the universe was much hotter and denser
