C8 Chemical Analysis

Question 1

What does it mean if a substance is pure

Answer 1

Only contains one compound or element .Not mixed with anything else

Question 2

A chemixally pure substance will melt or boil at

Answer 2

Speicific temperatures

Question 3

What are formulations ?

Answer 3

Formulations are useful mixtures that have been designed for a particular use

Question 4

How can you test for chlorine

Answer 4

Chlorine bleaches a damp litmus paper , turning it white

Question 5

How do you test for oxygen

Answer 5

If you put a glowing splint inside a test tube containing oxygen , the oxygen will relight the glowing splint

Question 6

How so yountest for carbon dioxide

Answer 6

You can test for carbon dioxide by bubbling it through a solution of sodium hydroxide.If the gas is carbon dioxide, the solution will turn cloudy

Question 7

What is the test for hydrogen

Answer 7

If you hold a lit splint at the open end of a test tube containing hydrogen, you’ll get a squeky pop

Question 8

Practical of chromotography

Answer 8

Step 1 - Cut out a rectangular piece of filter paper a little bit longer than the height of a beaker.Make sure your paper is narrower than the beaker
Step 2 - Draw a line in pencil , 1 cm from the bottom of the paper
Step 3 - Put a dot of the solution that you want to separate onto the pencil line .Wrap the top of the paper around the splint
Step 4 -Put a small amount of water in the beaker.
Step 5 -Balance the splint on the rim of the beaker.The bottom of the paper should just dip into the water.The pencil line and the sample solution must stay above the water
Step 6 - Leave until the water has soaked up to near the top of the paper