Measurments In Chemistry Flashcards Preview

Chemistry > Measurments In Chemistry > Flashcards

Flashcards in Measurments In Chemistry Deck (18)
Loading flashcards...
1
Q

What is the s i unit for measuring volume and what are some instruments to measure volume?

A

The s i unit for measuring volume is Cubic metre
Small volumes are measured in cubic centimetre
Where are the large volumes are measured in cubic decimeter

A beaker and conical flask can hold approximate volumes of 200 cm cube

2
Q

What is the accuracy of measuring cylinder?

A

Approximately measure the volume of a liquid to the nearest 0.5 CM
Example 24 cm cube or 32.5cm³

3
Q

What is the accuracy of a burette?

A

Accurately measures the volume of a liquid to the nearest 0.05 centimetre
For example 23.00 CM 34.45 CM³

4
Q

What is the accuracy of a pippete ?

A

Accurately measure with a fixed volume
Of liquid
Example 24 cm cube A 25 cm cube

5
Q

What are the usual laboratory thermometer?

A

The usual laboratory thermometer is mercury in glass or alcohol in glass type

6
Q

What is the s i unit of Temperature?

A

Laser unit with temperature is Kelvin

7
Q

What is the difference between kelvin and Celsius?

A

Temperature in kelvin is equal to temperature in Celsius plus 273.

8
Q

What is the lowest temperature theoretically possible on the Kelvin scale?

A

Lowest temperature possible on Kelvin scale is zero degrees which is equal to minus 273 degrees which is known as absolute zero.

9
Q

What is the SI unit for time?

A

Measured in hours minutes seconds

10
Q

What is Mass?

A

Is the measurement of the amount of matter contained in a body.

11
Q

What is the SI unit for mass?

A

Mass is measured in kilograms smaller masses are measured in grams

12
Q

What two types of instruments are used to measure masses in chemistry?

A

Triple beam balance and an electronic top balance.

13
Q

To what accuracy does a triple beam balance measure up to.

A

It was up to 0.1 gram

14
Q

What accuracy does a electronic top Pan balance measure to?

A

It measures to the nearest 0.001g

15
Q

When is displacement of Water used for the collection of gases?

A

It is used to collect the gases that are insoluble or slightly soluble in water for example hydrogen carbon dioxide and oxygen.

16
Q

When is downwards delivery used to collect gas?

A

This is used for the collection of gases that are soluble in water and more dense than air for example chlorine.

17
Q

When is upward delivery used for the collection of gases

A

It is used when the gases are soluble in water and is less dense than air. For example Ammonia and hydrogen

18
Q

Why would you use a gas change to collect gas?

A

this is particularly useful when you want to collect and measure the volume of gas over a period of time gas produced from the reaction of a substance in the conical flask is collected in the gas syringe the Apparatus is useful in experiments on speed of reaction.