Measurments In Chemistry

Question 1

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

Answer 1

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

Question 2

What is the accuracy of measuring cylinder?

Answer 2

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

Question 3

What is the accuracy of a burette?

Answer 3

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

Question 4

What is the accuracy of a pippete ?

Answer 4

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

Question 5

What are the usual laboratory thermometer?

Answer 5

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

Question 6

What is the s i unit of Temperature?

Answer 6

Laser unit with temperature is Kelvin

Question 7

What is the difference between kelvin and Celsius?

Answer 7

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

Question 8

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

Answer 8

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

Question 9

What is the SI unit for time?

Answer 9

Measured in hours minutes seconds

Question 10

What is Mass?

Answer 10

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

Question 11

What is the SI unit for mass?

Answer 11

Mass is measured in kilograms smaller masses are measured in grams

Question 12

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

Answer 12

Triple beam balance and an electronic top balance.

Question 13

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

Answer 13

It was up to 0.1 gram

Question 14

What accuracy does a electronic top Pan balance measure to?

Answer 14

It measures to the nearest 0.001g

Question 15

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

Answer 15

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

Question 16

When is downwards delivery used to collect gas?

Answer 16

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

Question 17

When is upward delivery used for the collection of gases

Answer 17

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

Question 18

Why would you use a gas change to collect gas?

Answer 18

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.