Acids and bases AS90944 year 11 revision.

by john west | Aug 29, 2012 | school posts, Year 11, K-12

Homework

End of term exams are looming. We revised the atomic structure aspects of this topic in class today and you may choose how you do your exam revision homework.

1) Print the practise test paper out at home and answer the questions on the printout

2) Download the practise paper onto your computer and answer the questions separately on your own paper.

3) Flick through the practise paper questions on the blog and answer them on your own paper.

DO QUESTION 1 TONIGHT

Practise paper

90944 sample paper-2010 acids and bases from johnwest

Atoms and atomic structure

A look at the periodic table

The Periodic Table of all the elements in the universe left after recycling through supernova on Prezi

The reaction between sodium and chlorine to produce sodium ions and chloride ions. Atoms gain lose or share electrons to end up with a full outer shell. Compounds containing ions are called ionic compounds.

Year 10, writing fully balanced chemical equations homework

by john west | Jul 24, 2012 | school posts, Year 10, K-11

Year 10, writing fully balanced chemical equations homework

A whole lot of the chemistry you have studied this year comes together in this exercise.

ions and how they are formed.
naming ionic compounds and writing their formula
word equations.

…….. and finally the last piece in the jigsaw writing a fully balanced chemical equation.

If you study NCEA chemistry at level 1 next year a rough guide is

Achievement: writing word equations.

Merit: Inserting chemical formulae into an equation.

Excellence: producing a fully balanced chemical equation.

Revise what we did today by watching the video then do the short exercise. In your notebook write down the word equation and complete it (achievement) Underneath the word equation insert the chemical formula of each substance (merit). Finally balance the equation (excellence) NOTE this usually involves sticking 2 in front of something

1 sodium hydroxide + sulphuric acid ——->

2 copper oxide + hydrochloric acid ——–>

Year 10 final atoms revision

by john west | Jun 20, 2012 | school posts, Year 10, K-11

Final homework on this topic. There are 20 questions so it will take longer than your usual homework. Good luck with the test on tuesday.

But where did all the atoms in periodic table come from?

by john west | May 29, 2012 | school posts, Year 09, K-10

In the beginning the universe was full of hydrogen atoms.

The sun uses a series of nuclear reactions called the hydrogen cycle. In the heart of the sun protons fuse together to give a Helium nucleus. The first reaction in this sequence is very slow and explains why the sun is still shining after 5 billion years.

Homework: Put a heading in your book with the date.

The universe started off with only one element, hydrogen. Our sun burns the protons from hydrogen atoms and converts them to helium. Do a bit of research to find out how the remaining elements in the periodic table are formed. (hint: think about supernova) Write a brief account outlining how other elements are generated. The best three answers win a Mars bar.

So much for atoms what about ions?

by john west | May 25, 2012 | school posts, Year 10, K-11

So much for atoms what about ions?

When we started this topic the big question was " what happens when atoms react"?

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When we started this topic the big question was ” what happens when atoms react”? We know enough now to answer this. Here is a review of the main points so far.

Elements with same number of outer electrons are arranged in columns on the Periodic Table called groups. Elements with the same number of electrons in their outer shell tend to have similar physical and chemical properties.
Finally atoms gain lose or share electrons to achieve a full outer shell like the inert gases.Now lets have a look at what happens when sodium and chlorine atoms react.