Natural Sciences and Technology for Classroom 1 (NST1501)
Exam (elaborations)
NST1501 Assignment 3 2024 | Due 28 June 2024
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Course
Natural Sciences and Technology for Classroom 1 (NST1501)
Institution
University Of South Africa (Unisa)
QUESTION 1
1.1
Define the following terms:
1.1.1 Solvent
1.1.2 Matter
(4)
1.2
Give an example of a heterogenous mixture.
(2)
1.3
Identify 2 different ways of separating homogenous mixtures
(4)
1.4
State the three different states of matter.
(3)
1.5
Identify the process:
1.5.1 Chang...
Natural Sciences and Technology for Classroom 1 (NST1501)
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Question 1
1.1. Define the following terms:
1.1.1. Solvent
A solvent is a substance capable of dissolving other substances to form a solution. It is typically the
component of a solution present in the largest amount. Solvents are commonly used in various
processes, such as chemical reactions, cleaning, and extraction, to dissolve and disperse other
substances. (Tutorial Letter - Page 21)
1.1.2. Matter
Matter refers to any physical substance that occupies space and has mass. It encompasses everything
around us, including solids, liquids, gases, and plasma. Matter is composed of atoms, which can
combine to form molecules and compounds. It is the fundamental building block of the universe and
is subject to various physical and chemical properties. (Study Guide - Page 7)
1.2. Give an example of a heterogeneous mixture.
Water and sand. In this case, the sand particles are suspended in the water but do not dissolve,
leading to a non-uniform appearance. This type of mixture can be separated through methods like
filtration. (Tutorial Letter - Page 21)
[OR]
Oil and water. When oil and water are combined, they do not mix uniformly, and the oil forms
distinct droplets within the water. This makes it a heterogeneous mixture, and it can be separated
using techniques like decantation or centrifugation.
1.3. Identify 2 different ways of separating homogenous mixtures.
Distillation is a process that separates the components of a liquid mixture based on differences in
their boiling points. When the mixture is heated, the component with the lower boiling point
vaporizes first, and then it is condensed back into a liquid, resulting in the separation of the
components.
Chromatography is a technique used to separate the components of a mixture based on their ability to
move through a medium. The mixture is dissolved in a fluid and then passed through a stationary
phase. The components move at different rates, leading to their separation.
(Study Guide - Page 10-11)
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