Practicals Flashcards by Amy Dolby

Q

What is a test for carbon dioxide?

A

when carbon dioxide is shaken with limewater, the limewater turns milky

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Q

What is the test for chlorine?

A

litmus paper
when damp, chlorine gas turns litmus paper bleached / white

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Q

What is the test for oxygen?

A

inset a glowing splint into a test tube of gas
if relights, in oxygen

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Q

What is the test for hydrogen?

A

burning splint at the edge of test tube of gas, if burns quickly with a pop sound, gas is hydrogen (squeaky pop test)

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Q

How do you test for hydrogen gas?

A

Lit /burning splint, burns with a squeaky pop

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Q

What is the test for chlorine?

A

damp litmus paper
if present, litmus paper bleached

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Q

Why are dissolved solids still present after filtration?

A

dissolved solids pass through filter paper
dissolved solids are very small

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Q

How does bioleaching extract low grade ores?

A

uses bacteria
to produce solutions containing copper compounds
from which copper is gained by electrolysis

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