Grade 9 Chemistry All Answers Graded A
States of Matter
Matter can exist in three main forms: solid, liquid, and gas. In a solid, particles are closely packed and
don't flow like liquids. Solids retain their shape and occupy a fixed volume. Liquids, on the other hand,
have particles that ar...
Grade 9 Chemistry All Answers Graded A
States of Matter
Matter can exist in three main forms: solid, liquid, and gas. In a solid, particles are closely packed and
don't flow like liquids. Solids retain their shape and occupy a fixed volume. Liquids, on the other hand,
have particles that are farther apart and can flow to take the shape of their container. The volume of a
liquid does not change unless it is compressed or expanded.
Physical Properties
Physical properties are characteristics that help identify a substance. These properties can be either
qualitative, describing the substance's appearance or texture, or quantitative, involving a measurable
value such as boiling or melting point. Chemical properties, on the other hand, describe how a
substance reacts with other substances.
Density
Density is a physical property that is defined as mass per unit volume. It is calculated using the formula
D=M/V or D=V/M. The density of water is 1 gram per milliliter.
GRASS Method
The GRASS method is a problem-solving approach that stands for Given, Required, Analysis, Solve, and
Statement. It is useful for solving problems involving density and other physical properties.
Elements and Atomic Structure
Elements are substances that cannot be broken down into simpler substances by chemical means.
Atoms are composed of protons, neutrons, and electrons. Protons have a positive charge and reside in
the nucleus, while neutrons have no charge and also reside in the nucleus. Electrons have a negative
charge and orbit around the nucleus in energy levels or electron shells.
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