AS MOVE COURSE

SUMMERTIME 2012

PART 1: MEASURING AMOUNT OF SUBSTANCE

MASSVOLUMEMOLAR MASSAVOGADRO

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CONCENTRATIONATOMIONMOLECULE

PROGRAM OUTLINE

OCR Chemistry A

Unit one particular – Slide Term 2012

• Atoms and Electron Structure

• Moles, Equations and Acids

• Framework and Bonding

• Redox, Group two and Group 7

Device 1 Exam – January 2013 – 1 hour – 90 UMS – thirty percent of total

Unit two – Springtime Term 2013

• Basic Concepts in Organic Biochemistry

• Alkanes and Alkenes

• Haloalkanes and Alcohols

• Enthalpy Changes

• Rates and Equilibrium

• Modern Synthetic Techniques

• Chemistry from the Air

• Sustainability

Unit 2 Test – May well 2013 – 1 hr 45 a few minutes – 150 UMS – 50% of total

Unit 3 – Autumn Term 2012 and Spring Term 2013

Inside Assessments – 60 UMS – 20% of total

MEASUREMENTS IN CHEMISTRY

Mass

Convert this into grms:

a) zero. 25 kilogram

b) 15 kg

c) 100 tonnes

d) two tonnes

Volume level

Convert the subsequent into dm3:

a) 100 cm3

b) 25 cm3

c) 50 m3

d) 50000 cm3

Tip – always use normal form pertaining to very large and incredibly small amounts!

What is a mole?

Atoms and molecules are very small – far too promising small to count individually!

It is important to be aware of how much of something we have, but all of us count contaminants in SKIN MOLES because you get easier numbers

1 mole sama dengan 6. 02 x 1023 particles

(6. 02 back button 1023 is called Avogadro's number)

a) For those who have 2 . five x 1021 atoms of magnesium, how many moles do you have?

b) If you have zero. 25 skin moles of co2, how many molecules do you have?

How can you work out how various moles you could have?

a) From a measurement of MASS:

You can find the quantity of moles of the substance in case you are given it is mass therefore you know the molar mass:

number of moles=mass/molar mass

n=m/mr

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Mass MUST be scored in grms!

Molar mass has units of gmol-1

|1. Calculate the number of skin moles present |2. Calculate the mass of: |3. Determine the molar mass in the | |in: | |following substances: | |a) 2 . 3 g of Na |a) 0. 05 skin moles of Cl2 |a) zero. 015 skin moles, 0. forty two g | |b) installment payments on your 5 g of UNITED KINGDOM |b) 0. 125 moles of KBr |b) zero. 0125 skin moles, 0. 60 g | |c) 240 kg of CO2 |c) 0. 075 moles of Ca(OH)2 |c) 0. fifty-five moles, 88 g | |d) doze. 5 g of Al(OH)3 |d) two hundred and fifty moles of Fe2O3 |d) 2 . twenty-five moles, 63 g | |e) five. 2 g of PbO2 |e) zero. 02 moles of Al2(SO4)3 |e) 0. 00125 skin moles, 0. 312 g

b) Coming from a way of measuring of AQUEOUS VOLUME:

You will discover the number of skin moles of a element dissolved in water (aqueous) if you are provided the volume of solution therefore you know the molar attention:

number of moles=aqueous volume xmolar concentration

n=VxC

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Aqueous volume Should be measured in dm3!

attentiveness has units of moldm-3

If you know the dimensions of the molar mass of the material, you can convert the molar concentration to a mass focus:

Molar attentiveness (moldm-3) xmr=mass concentration (gdm-3)

|1. Compute the number of moles of |2. Calculate the molar attentiveness and |3. Calculate the molar focus and | |substance within each of the following |the mass concentration in the following |the mass attentiveness of the subsequent | |solutions: |solutions: |solutions:...

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