YR 9 -Chemistry revision - Chemical formulae

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Chemistry

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9th - 11th Grade

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Arunthathi Sankaran

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4 Slides • 6 Questions

YR 9 -Chemistry revision - Chemical formulae

Moles

A mole is just a (very large) number of particles.
Amount of substance is measured using a unit called the mole (mol for short) and given the symbol n.
One mole is roughly 6×10^23 particles which is Avagadro's constant

Molar mass

Molar mass is just the same as relative molecular mass (Mr)
Molar Mass of CaCO3 is 40.1 + 12 + (3 x 16) = 100.1g/mol
Moles= Mass/(Molar Mass (Mr))

Multiple Choice

How many moles are in 5.8g of CaCO₃?

0.58

0.058

5.8

0.0058

Multiple Choice

Calculate the mass of 0.36 moles of CaCO₃.

3.6

0.36

0.036

Multiple Choice

A molecule has a mass of 7g and its number of moles is 0.237. What is the molecular mass of this molecule?

1.7

0.03

0.30

Moles and volume

Moles=Conc. ×Volume

Multiple Choice

What would the concentration be if 3 moles where dissolved in 3 dm³?

100

0.09

Multiple Choice

What mass of H2SO₄ is needed to produce 25cm³ of 25M solution

0.01

62.5

0.625

Multiple Choice

What mass of sodium hydroxide (NaOH) needs to be dissolved in 500cm³ of water to make a 2M solution

0.004

250

1000

YR 9 -Chemistry revision - Chemical formulae

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