• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Hypothesis: some metal carbonates decompose more easily than others when they are heated.

Page
  1. 1
    1
  2. 2
    2
  3. 3
    3
  4. 4
    4
  5. 5
    5
  • Essay length: 852 words
  • Submitted: 24/10/2012
  • Marked by teacher: (?) Louise Star
  • Awarding body: Edexcel (for GCSEs)
Share this essay:
GCSE Patterns of Behaviour

Teacher essay summary

3 star(s)

A reasonable write up which has a good beginning and method. It however loses momentum in the last section and does not give suggestions how the method could be improved. 3 Stars.

Marked by teacher Louise Star 21/06/2013

The first 200 words of this essay...

Thermal decomposition of carbonates

Introduction:

Carbonates decompose when they are heated, producing calcium oxide and carbon dioxide. Carbon dioxide can be detected using lime water.

Calcium carbonate calcium oxide + carbon dioxide

CaCO3 CaO + CO2

Other metal carbonates decompose in the same way. Here are the equations for the thermal decomposition of copper carbonate:

copper carbonate copper oxide + carbon dioxide

CuCO3 CuO + CO2

Hypothesis: some metal carbonates decompose more easily than others when they are heated.

Aim: The times taken for a chemical reaction to take place metals high up in the reactivity series (such as calcium) have carbonates that take a lot of energy to decompose them. Metals low down in the reactivity series (such as copper) have carbonates that are easily composed. This is why copper carbonate is often used at school to show these reactions. It is easily decomposed and its colour change, from green copper carbonate to black copper oxide, it is easy to see.

Risk Assessment

Lime water

Copper carbonate

Spillages

Bunsen burner

Boiling tubes

Hair

General lab

Read more
The above preview is unformatted text

Found what you're looking for?

  • Start learning 29% faster today
  • Over 150,000 essays available
  • Just £6.99 a month

  • "
    Certainly, the advantage of being able to see such a vast collection of examplars which comes with being a member of Markedbyteachers.com is astounding.
    "
    Telim Dars. Chemistry, Physics and English Literature. A Level Student.
  • "
    Markedbyteachers.com provide an excellent service by offering students useful exemplars to guide and shape their work.
    "
    Jackie Shanahan. Maths. A Level Student.

MbT essay summary

A reasonable write up which has a good beginning and method. It however loses momentum in the last section and does not give suggestions how the method could be improved. 3 Stars.

Marked by teacher Louise Star 21/06/2013

Marked by a teacher

This essay has been marked by one of our great teachers. You can read the full teachers notes when you download the essay.

Peer reviewed

This essay has been reviewed by one of our specialist student essay reviewing squad. Read the full review on the essay page.

Peer reviewed

This essay has been reviewed by one of our specialist student essay reviewing squad. Read the full review under the essay preview on this page.