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Worksheets3rd Monthly Test
Total questions: 20
Worksheet time: 15mins
a substance that consists of only one type or kind of atom.
element
compound
made up of two or more substances that are not chemically combined.
(a)
Has definite shape
Solid
Liquid
Gas
Plasma
Changes shape depending on container
Solid
Liquid
Gas
Plasma
is the process by which molecules undergo a spontaneous transition from a liquid phase to a gas phase.
(a)
the settling of particles or sediment onto a surface.
deposition
freezing
condensation
melting
the Science that deals with the materials of the universe and the changes that these materials undergo. The study of matter, its composition and structure, properties, and the changes it undergoes.
(a)
D = m/V
Volume
Matter
Density
Mass
is considered the smallest particle of matter which makes up the world around us.
(a)
“Atomos” greek word meaning “uncut”
J.J. Thompson
Aristotle
John Dalton
Democritus
He believed that matter was made up of four natural elements.
(a)
Billiard Ball Model
James Chadwick
John Dalton
Ernest Rutherford
Niels Bohr
When jumping from one orbit to another with lower energy, a light quantum is emitted
(a)
a tiny subatomic particle with a negative charge. It is often represented as e−, with the right superscript showing the negative charge.
Electron
Proton
Neutron
p+
proton
neutron
electron
the region where relatively massive protons and neutrons are collected in the center of an atom
(a)
The sum of the number of protons and neutrons in the nucleus
(a)
hydrogen atom based on quantum theory that energy is transferred only in certain well-defined quantities
Democritus
Niels Bohr
James Chadwick
J.J. Thompson
Cathode rays consist of negatively charged particles called electrons
Used the “plum - pudding” or “raisin bread” model
(a)
