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Notes and Questions: Aqa Gcse

1. Pure substances are single elements or compounds not mixed with any other substances. They melt and boil at specific temperatures. 2. Formulations are designed mixtures that have been developed as useful products. Common products are chemical mixtures where each component has a particular purpose, such as cleaning products. 3. Chromatography can be used to separate mixtures and provide information to help identify substances. It involves two phases where substances separate depending on how they are distributed between the phases, which can be measured by the Rf value.

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96 views10 pages

Notes and Questions: Aqa Gcse

1. Pure substances are single elements or compounds not mixed with any other substances. They melt and boil at specific temperatures. 2. Formulations are designed mixtures that have been developed as useful products. Common products are chemical mixtures where each component has a particular purpose, such as cleaning products. 3. Chromatography can be used to separate mixtures and provide information to help identify substances. It involves two phases where substances separate depending on how they are distributed between the phases, which can be measured by the Rf value.

Uploaded by

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AQA GCSE

Notes and Questions

Chemical Analysis
Pure Substances:
In Chemistry, a pure substance is a single e_____ or
c________ not mixed with any other s___________.
Pure e________ and c__________, m______ and b_____ at
specific temperatures.

1. What name is given to the temperatures at which pure


substances change states.

2. How would impurities affect the temperature at which


substances change state .

Sometimes we use the word p_____ to describe substances that


have had nothing added to them. In other words the substance is
u_________ and in its n________ state.

2. Give an example of above.


Formulations:

A formulation is a mixture that has been d________ as a useful


p_______.
Many products are c_________ mixtures in which each
c________ has a particular purpose.

4. How are formulations made?.

5. Give examples of formulations


Chromatography:

Chromatography can be used to s_______ mixtures and can give


information to help i______ substances.

6.Chromatography involves which two phases?

S__________ depends on the distribution of substances


between the phases.

7.What is meant by the Rf value?

8.Write an equation to calculate the Rf value?

Different c_________ have different _____ values in


different s________, which can be used to help i_________ the
compounds. The compounds in a m________ may s_______ into
different s______ depending on the s______ but a p_____
compound will produce a s_______ s________ in all s__________.
9.Write a description of how to carry out paper
chromatography.

10.Explain how paper chromatography separates mixtures?


11.Calculate the Rf values of the three colours.?
Identification of common gases:

Gas Test

Hydrogen L_______ splint goes out with a s_______ p____

Oxygen R_________ a g_________ splint

Carbon Dioxide Turns l___________, m_________.

Turns damp b_______ l________ paper red then


Chlorine
w________ (the paper has been b_________).

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