Back to Course

SS1: CHEMISTRY - 1ST TERM

0% Complete
0/0 Steps
  1. Introduction to Chemistry and Laboratory Apparatus | Week 1
    5 Topics
    |
    1 Quiz
  2. Nature of Matter | Week 2
    3 Topics
    |
    1 Quiz
  3. Separation Techniques I | Week 3
    1 Topic
  4. Separation Techniques II | Week 4
    5 Topics
    |
    1 Quiz
  5. Particulate Nature of Matter I | Week 5
    5 Topics
    |
    1 Quiz
  6. Particulate Nature of Matter II | Week 6
    9 Topics
    |
    1 Quiz
  7. Symbols, Formulae & Oxidation Number | Week 7
    7 Topics
    |
    1 Quiz
  8. Laws of Chemical Combination | Week 8
    4 Topics
    |
    1 Quiz
  9. Chemical Equation & Chemical Combination (Chemical Bonding) I | Week 9
    4 Topics
    |
    1 Quiz
  10. Chemical Combination (Chemical Bonding) II | Week 10
    4 Topics
    |
    1 Quiz
  11. Chemical Combination (Chemical Bonding) III & Shapes of Covalent Molecules | Week 11
    3 Topics
    |
    1 Quiz



Lesson 2, Topic 3
In Progress

Elements, Compounds and Mixtures

Lesson Progress
0% Complete

Topic Content:

  • Element
  • Compound
  • Mixture
  • Differences between Mixtures and Compounds
  • Theory Questions and Answers

Matter may be classified into elements, compounds, and mixtures.

Element:

An element is a substance which cannot, by any chemical process, be split up into two, or more, simpler substances. There are over 100 known elements scattered in different percentages all over the world. They occur naturally alone or in combination with other materials.

 

You are viewing an excerpt of this Topic. Subscribe Now to get Full Access to ALL this Subject's Topics and Quizzes for this Term!

Click on the button "Subscribe Now" below for Full Access!

Subscribe Now

Note: If you have Already Subscribed and you are seeing this message, it means you are logged out. Please Log In using the Login Button Below to Carry on Studying!

avataravataravataravataravataravatar

Responses

Your email address will not be published. Required fields are marked *

Theory Question 1

(a) What is matter?

Answer: Matter is defined as anything that has mass and occupies space.

 

(b) Give three physical properties of matter.

Answer:

(i) Colour (ii) texture (iii) melting point

Theory Question 2

Classify each of the following as physical change or chemical change 

(i) Boiling of egg                     (ii) Melting of wax 

(iii) Rusting of iron                 (iv) Digestion of Glucose

Answer:

Physical Change

Chemical Change

Melting of wax

Rusting of iron

Boiling of egg

Digestion of glucose

Theory Question 3

Write four examples in each case of

 (a) Physical change     (b) Chemical change

Answer:

a. Physical Change

  1. Melting of wax
  2. Magnetization of iron
  3. Liquefaction of gases
  4. Freezing of liquid to solid

b. Chemical Change

  1. Rusting of iron
  2. Changes in an electrochemical cell
  3. Slaking of lime
  4. Fermentation of substance

Theory Question 4

(a) Define the following: (i) Compound (ii) Mixture

(b) Give three differences between Compound and Mixture

Answer:

(i) A compound is a substance that contains two or more elements chemically combined together. E.g. water (H2O)

(ii) A mixture contains two or more constituents which can easily be separated by physical compounds. E.g. Blood.

 

b. 

Answer:

  Compound Mixture
(i) Always homogenous May be homogenous or heterogenous
(ii) Can be represented by chemical formula because the constituents are present in a fixed ratio Constituent elements are chemically bonded and cannot be separated by physical method
(iii) Constituents elements are chemically bonded and cannot be separated by physical method Constituent elements are not chemically bonded together and therefore can be separated by physical means

Theory Question 5

(a) State the difference between a homogeneous mixture and a heterogeneous mixture 

Answer:

Homogenous mixtures are mixtures of relatively uniform compounds where the components are in the same phase e.g. air

While

Heterogeneous mixtures are mixtures whose components are in different phases e.g. kerosene and water.

 

Classify the following into homogenous and heterogeneous mixtures: Brine, Sweat, Muddy water, Table salt, Sand, Blood

Answer:

Homogenous mixture

Heterogeneous mixture

Sweat, Table salt

Muddy water, Blood, Sand

error: Alert: Content selection is disabled!!