- Introduction to Chemistry and Laboratory Apparatus | Week 15Topics1 Quiz
- Nature of Matter | Week 23Topics1 Quiz
- Separation Techniques I | Week 31Topic1 Quiz
- Separation Techniques II | Week 45Topics1 Quiz
- Particulate Nature of Matter I | Week 55Topics1 Quiz
- Particulate Nature of Matter II | Week 69Topics1 Quiz
- Symbols, Formulae & Oxidation Number | Week 77Topics1 Quiz
- Laws of Chemical Combination | Week 84Topics1 Quiz
- Chemical Equation & Chemical Combination (Chemical Bonding) I | Week 94Topics1 Quiz
- Chemical Combination (Chemical Bonding) II | Week 104Topics1 Quiz
- Chemical Combination (Chemical Bonding) III & Shapes of Covalent Molecules | Week 113Topics1 Quiz
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. Examples include – oxygen, hydrogen, chlorine, sodium, magnesium, etc.
Compound:
A compound is a substance which contains two or more elements, chemically combined together. Examples include water (H2O), carbon (IV) oxide (CO2), sodium chloride (NaCl), etc.
Mixture:
A mixture contains two or more constituents which can easily be separated by physical methods. The components of mixtures may be elements or compounds or both.
Types of Mixtures:
1. Homogenous Mixture.
2. Heterogeneous Mixture.
Homogenous Mixture: Sometimes called solutions are mixtures of relatively uniform composition, where the components are in the same phase. Example sugar solution, air, seawater, brass, salt solution, etc.
Heterogeneous Mixtures are mixtures in which their components are in different phases e.g kerosene and water, mud water, etc.
Other examples of mixtures are blood, crude oil, soil, urine, palm wine, milk, coca-cola.
Differences between Mixtures and Compounds
| Mixtures | Compounds | |
| 1 | May be homogenous or heterogeneous | Always homogenous |
| 2 | Constituent elements are not chemically bonded together and therefore can be separated by physical means. | Constituent elements are chemically bonded and cannot be separated by physical method. |
| 3 | Cannot be represented by chemical formula because the constituents are not in a fixed ratio. | Can be represented by chemical formula because the constituents are present in a fixed ratio. |
| 4 | Properties of mixtures are a sum of their individual elements. | Properties of a compound differ from those of its component elements. |
Essay Questions
1. (a) What is matter? Â
(b) Give three physical properties of matter.
View Answer2. Classify each of the following as physical change or chemical changeÂ
(i) Boiling of egg (ii) Melting of wax
(iii) Rusting of iron (iv) Digestion of Glucose
View Answer3. Write four examples in each case of
(a) Physical change (b) Chemical change
View Answer4. (a) define the following: (i) Compound (ii) Mixture
(b)Give three differences between Compound and Mixture
View Answer5. (a) State the difference between a homogeneous mixture and a heterogeneous mixtureÂ
(b) Classify the following into homogenous and heterogeneous mixtures; Brine, Sweat, Muddy water, Table salt, Sand, Blood
View Answer