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Lembar kerjaINTRODUCTION TO CHEMISTRY FOR HERBAL PRODUCTION_CHAPTER 1
Total soal: 10
Worksheet time: 15mins
Find A.
(a)
Find B.
(a)
Write the correct chemical formula for lithium and nitrogen.
(a)
Choose a subatomic particle that has the smallest mass.
A proton
An electron
A neutron
An alpha particle
Identify the chemical formula that is a molecule.
Ca
CO
Cr
Cu
Select the best definition to describe a molecule.
A collection of two or more atoms bound together chemically.
A substance that cannot be separated by chemical reaction.
Composed of protons, electrons and neutrons.
Consists of neutral particles and are the smallest unit of an element.
The element that exists as diatomic molecule is
Boron
Silicone
Fluorine
Helium
State the number of neutrons, protons and electrons in the ion.
(Refer Image)
16 neutrons, 15 protons, 18 electrons
31 neutrons, 15 protons, 15 electrons
16 neutrons, 15 protons, 12 electrons
16 neutrons, 15 protons, 15 electrons
An atom has a mass number of 19 and atomic number 9. Identify the number of protons.
28
19
10
9
Identify the proton number of an ion that has 18 electrons, 20 neutrons and a charge of +2.
16
18
20
38
