# C5

How do you work out molar mass?
Relative formular mass (Mr) times the amount of the element
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What is relative formula mass?
Amount of a substance in a chemic reaction (measure in mols per gram)
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What's the equation to to calc number of miles in element or compound?
No. Of moles = mass/molar mass
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What is conservative mass and how can it be changed?
It is when no mass is lost or gained during a chemical reaction, but night weight more due to gas being gained from air or water vapour escaping
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How can you calculate mass of elements in a compound?
If you know mass of compound and mass of elements you can find the missing element by taking away the element from the compound.
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What are the measurements usually used to measure a volume of a liquid?
Cm cubed Decimetres cubedW
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How do you convert Cm cubed to decimetres cubed and decimetres cubed to cm cubed??
Cm cubed/1000 = dm cubed Dm cubed x 1000 = cm cubed
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How can you dilute a solution?
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How can you work out the the amount you are meant to dilute something?
The concentration divided by the amount of concentration needed timse the overall solution. For example 5cm cubed of solution, concentration if 1mol/dm cubed, how much water for 0.1mol/dm cubed
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what is GDA?
guideline daily amounts of the food for a healthy person
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how can you work out the concerntration in (g/dm cubed or mol/dm cubed)?
g/dm cubed... concentration = mass of solute in g / volume of solvent dm cubed. concentration = amount of solute (mol) / volume of solvent in dm cubed
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work out the concentration of ... 2g of sodium chloride is dissolved in 100cm cubed of water.what is the concentration in g/dm cubed?
1. change in dm cubed (100/1000=0.01dm cubed) 2/0.01= 20g/ddm cubed
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what is titration?
when and acid or alkali react together also known as neutralisation, to find the titration is to find out how much acid is needed to neutralise the alkali
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what is the word equation for titration?
acid + alkali --> salt +water
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how can you carry out titration?
measure alkali by using pipette and filler. add drops of indicator to flask. fill burette with acid. record first volume of acid. add acid slowly (until alkali changed colour). then work out amount of acid used.
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what colour do these indicaters turn in an acid or an alkali? 1.limtus. 2.phenolphthalein. 3.universal indicator.
1.Limtus-(ACID-red) (ALKALI-blue). 2.Phenolphthalein-(ACID-colourless) (ALKALI-pink). 3.Universal indicator-(ACID-red) (ALKALI-blue)
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what are pH curves used for?
to show what happens to the pH in neutralisation
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what happens to the pH curve if an acid is added to an alkali, and when an alkali is added to an acid?
acid+alkali=ph increases. alkali+acid=ph decreases
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how do you work out concentration, volume and moles using an equation triangle?
BOTTOM: concerntration (mols/dm cubed) & volume (dm cubed). TOP: moles
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how can you measure gas volumes?
upturned measuring cylinder, gas seringe and an upturned burette
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how can you measure gas masses??
you can measure it by monitoring the change in mass. 1.measure mass of empty flask. 2.measure reactants. record all mass (reactants+flask). 3.add all together. 4.rcord weight at time intervals. 5.stop measuring weight when it stops changing
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what are the rules for sketching graphs for reactions?
1.Curve should be steepest at the beginning. 2.Curve should be shallower as the reaction goes on. 3.curve should go horizontal at end of reactionto show the reaction has stopped
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what volume of gas does all moles occupy? what can you use it do?
24 dm cubed. you can calculate volume of a known amount of gas. you can also calculate the amount of gas if the volume is known
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what is a reversible reaction?? whats an example of a reversible reaction??
a reaction that the reactants and the products can be constantly change back to each other. nitrogen + hydrogen ammonia.
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what is equilibrium?
a reverible reaction can reach equilibrium (a balance) which means the rate of the reaction going foward is exactly the same when you go back ward.
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how can you vhange the equilibrium?
the temp, the pressure, the concentration of reactants and/or products
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how can sulfur, air and water be made into sulfuric acid?
the contact process, by burning sulfure in a furnace to make sulfur dioxide. then sulfur dioixide combines with oxygen to make a reversible reaction (making sulfur trioxide), sulfur trioxide is then dissolved in water to make sulfuric acid.
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what are the uses of sulfuric acid?
paints and pigments, soaps and detergents, fibers, plastics and fertillisers
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what happens at the tart of an equilibrium reaction?
the foward reaction will slow down and the backward reaction will speed up. it will do this until it is even.
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how can the equilibrium be moved to te right of the equations to even it out?
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how can the equilibrium be moved to the left of the equation?
reducing the amount of reactant or increasing the amount of product
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what acids do to water? what does a strong and weak acid do?
they make the hydrogen ions (h+). strong acid=ionises completely in water. weak acid=only partically ionises the water.
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do the strong acids have a higher or lower pH than weak acids?
they have a lower pH
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How can the concentration of an acid be determined?
by howmany moles of the acid are dissolved in dm cubed.
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is it true or false that an acid with more H+ ions and weak acid and that is has a high pH?
flase, it is a strong acid and has a low pH
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do strong or weak acids work best as conductors?
strong acids do because it has more charged hydrogen ions to be carried around
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are the hydrogen atom attracted to the anode or cathode?
they are attracted to the cathode (negative electrode) because a hydrogen gas is made as the electroylsis turns them into a hydrogen molecule.
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what mathod can you use to make an insoluable fluid by mixing the two ionic substances together?
mix the reactants. filter off the insoluable fluid. wash residue in a filter funnel with small amount of distilled water. dry the product in an oven at 550 degrees.
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what is a precipitate solution? what happens to the ions?
it is am insoluable fluid. the ions from one solution collide with the ions from another solution and from and insoluable compound.
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how can you detect halides ions?
using silver nitrate, chlorides form white precipitates.bromides form a cream colour and iodies form a yellow preipitate.
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how can you detect sulphate ions?
using barium chloride and it will turn a white precipitation of barium sulfate
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## Other cards in this set

### Card 2

#### Front

What is relative formula mass?

#### Back

Amount of a substance in a chemic reaction (measure in mols per gram)

### Card 3

#### Front

What's the equation to to calc number of miles in element or compound?

#### Back ### Card 4

#### Front

What is conservative mass and how can it be changed?

#### Back ### Card 5

#### Front

How can you calculate mass of elements in a compound?

#### Back 