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Explain how melting and boiling points are influenced by intermolecular forces

All matter is made up of particles and there are three states of matter that particles can be in: solid, liquid, or gas. We can represent the different states of matter using the simple Particle Model, where...
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Answered by Nicola H. • Chemistry tutor
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67.2 g of iron was found to react with 28.8 g of oxygen. What is the empirical formula of iron oxide?

The first step is to calculate how many moles of iron and oxygen react together. Remember that moles = mass (g)/Ar (relative atomic mass). Given that the Ar of iron is 56 and the Ar of oxygen is 16, the mole...
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Answered by Harry H. • Chemistry tutor
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What exactly is meant by 'balancing equations'?

Chemical reactions can be written as an equation with molecules on each side of the equation. Balancing equations is about ensuring that the number of atoms of each element on the left hand side of an equati...
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Answered by Michael F. • Chemistry tutor
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What is a method that you can use for balancing equations?

Below is 2 examples of questions that you could be asked. During the session, I will run through on the whiteboard, a good method of completing this style of question. _GaF 3 + _Na 3 PO 4 -----> _GaPO 4 +...
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Answered by Adit B. • Chemistry tutor
2449 Views

Calculate the pH of the buffer solution resulting from mixing 250 cm^3 of 0.3 moldm^-3 ethanoic acid with 250cm^3 of 0.2 moldm^-3 sodium hydroxide. The Ka of ethanoic acid is 1.8 x 10^-5.

As an acid is being added to a base, you first need to calculate what is left after they react. Without doing any calculations, we can already see that the acid is in excess as both solutions have the same v...
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