Lab 2- Density and Chemical Reactions

Question 1

Aim

Answer 1

To determine density of solids and liquids, observe typical chemical reaction

Question 2

Density

Answer 2

The mass per unit volume of a substance. A physical property.

Question 3

Physical properties

Answer 3

Can be measured without changing the chemical identity

Question 4

Pure substances

Answer 4

All have unique densities.

Question 5

Chemical equations

Answer 5

Represent what transpires in a chemical reaction.

Question 6

Things to know writting a reaction

Answer 6

What the products are

Question 7

Products idnetifying

Answer 7

By their chemical and physical properties

Question 8

Identifying substances

Answer 8

By the use of instruments, by reaction characteristics, or both

Question 9

Test

Answer 9

Reactions that are characteristic of a substance

Question 10

Qualitative analysis

Answer 10

The area of chemistry concerned with identification of substances

Question 11

Increase precition

Answer 11

Repeat a test three or more times, a precision of human error and the equiptment

Question 12

Metals and acids

Answer 12

React to liberate hydrogen and form the metal salt of the acid

Question 13

Noble metals

Answer 13

Do not react with acids to produce hydrogen

Question 14

Unreactive metals

Answer 14

Can react with nitric acid, however gases that are oxides of nitrogen rather than hydrogen are formed

Question 15

Metathesis reaction names

Answer 15

Double replacement, exchange

Question 16

Presence of carbonate ion

Answer 16

They react with acids to liberate carbon dioxide

Question 17

Confirmatory test for CO2

Answer 17

Is to allow it to react with Ba(OH)2, and a white precipitate will formBaCO3

Question 18

Epsom salts use

Answer 18

As a purgative, and solutions of this salt are used to soak tired feet

Question 19

Why does H2SO4 liberate heat

Answer 19

In the reaction with MgSO4 and H2O, it is because of the water

Question 20

What is commercial bleach

Answer 20

A 5% solution of sodium hypochlorite

Question 21

Chlorine

Answer 21

A pale yellow-green gas with an irritating odor, and is toxic

Question 22

Iodine

Answer 22

Imparts a violet colour on mineral oil

Question 23

Colour from Iodide and sulphuric acid

Answer 23

Instantly turns dark brown, with violet fumes