Chemical analysis Flashcards

1
Q

what is filtration?

A

Filtration is used to separate an insoluble solid from a liquid.

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2
Q

What is precipitation?

A

Precipitation is the reaction of two solutions to form an insoluble salt called a precipitate.

You can recognise a precipitate from the state symbols in a balanced formula equation.

Precipitation can be used to prepare an insoluble salt.

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3
Q

What is the test for oxygen?

A

The test for oxygen gas is that it relights a glowing splint.

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4
Q

What is the test for hydrogen gas?

A

The test for hydrogen gas is that it makes a pop with a lighted splint.

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5
Q

What is the test for carbon dioxide?

A

The test for carbon dioxide gas is that it turns limewater from clear to cloudy.

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6
Q

How can insoluble or slightly soluble gases be collected?

A

Insoluble or slightly soluble gases like carbon dioxide, hydrogen and oxygen are collected by downward displacement of water.

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7
Q

How can gases that are denser than air be collected?

A

Gases that are denser than air, like chlorine and hydrogen chloride (both of which are very soluble in water), are collected by downward delivery. Sometimes a cold water bath is placed around the collection vessel to ensure that the gas does not escape.

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8
Q

How can gases that are soluble in water and less dense than air be collected?

A

Gases that are soluble in water and less dense than air are collected by upward delivery.
Ammonia gas is collected in this way.

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9
Q

What is a solute?

A

The substance that is dissolved in a solution.

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10
Q

What is a solution?

A

The product of dissolving a solute in a solvent.

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11
Q

What is a solvent?

A

The substance in which a solute is dissolved to make a solution.

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