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Combined Chemistry > Chapter 1: Experimental Chemistry > Flashcards

Chapter 1: Experimental Chemistry Flashcards

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1
Q

What is the SI unit for time?

A

Second (s)

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2
Q

What is the SI unit for temperature?

A

Kelvin (K)

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3
Q

How is temperature in Kelvin calculated from degrees Celsius?

A

Temperature in K = Temperature in °C + 273

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4
Q

What is the SI unit for mass?

A

Kilogram (kg)

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5
Q

What is the SI unit for volume?

A

Cubic metre (m³)

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6
Q

What are the two types of thermometers commonly used in laboratories?

A

Alcohol and mercury thermometers

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7
Q

What is the advantage of digital thermometers?

A

They have a wider temperature range and can record data using data loggers

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8
Q

What is the accuracy of a pipette?

A

Measures fixed volumes accurately, e.g., 10.0 cm³ or 25.0 cm³

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9
Q

What is the accuracy of a volumetric flask?

A

Measures accurate fixed volumes that are larger, e.g., 100 cm³ or 250 cm³

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10
Q

What is the accuracy of a measuring cylinder?

A

Measures a range of volumes to the nearest 0.5 cm³, e.g., 31.5 cm³ or 23.0 cm³

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11
Q

What is the accuracy of a burette?

A

Measures a range of volumes to the nearest 0.05 cm³, e.g., 31.55 cm³ or 23.00 cm³

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12
Q

Which method is used to collect gases insoluble in water?

A

Water displacement

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13
Q

How are gases less dense than air collected?

A

Using upward delivery

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14
Q

How are gases denser than air collected?

A

Using downward delivery

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15
Q

What is an example of a gas collected using water displacement?

A

Hydrogen, oxygen, or carbon dioxide

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16
Q

What is an example of a gas collected using upward delivery?

A

Ammonia

17
Q

What is an example of a gas collected using downward delivery?

A

Chlorine, hydrogen chloride, or sulfur dioxide

18
Q

Which drying agent is used for most gases but not ammonia?

A

Concentrated sulfuric acid

19
Q

Why must quicklime (calcium oxide) be freshly heated before use?

A

It absorbs moisture from the air and reacts with carbon dioxide

20
Q

In filtration, what is the substance left on the filter paper called?

A

Residue

21
Q

What is crystallization used for?

A

To obtain a pure solid from its saturated solution

22
Q

How is pure copper(II) sulfate obtained via crystallization?

A

By cooling a saturated copper(II) sulfate solution to form crystals

23
Q

What is simple distillation used for?

A

To separate a pure liquid from a solution

24
Q

How does fractional distillation differ from simple distillation?

A

It separates miscible liquids with different boiling points

Combined Chemistry (3 decks)

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