HUBS1406 mid year 2026 Exam –
Verified Questions and Answers for an
A Grade
atomic number - CORRECT ANSWERS the number of protons in the nucleus of an atom,
which is characteristic of a chemical element and determines its place in the periodic table
atomic weight - CORRECT ANSWERS Another term for atomic mass which is the total
number of particles in the nucleolus , this the approximately equal to the number of protons and
neutrons, with a bit extra added by electrons. Calculated by adding the mass of protons and neutrons
molecular weight - CORRECT ANSWERS the sum of the atomic weights/ mass of all the
atoms in a molecule
ion - CORRECT ANSWERS an atom or molecule with a net electric charge due to the loss or
gain of one or more electrons. (An atom or molecule that has a positive or negative electric charge).
atom - CORRECT ANSWERS a particle of matter that uniquely defines a chemical element.
(smallest unit into which matter can be divided without the release of electrically charged particles).
molecule - CORRECT ANSWERS The smallest particle of a substance that has all of the
physical and chemical properties of that substance. (Two or more atoms joined via a covalent chemical)
proton - CORRECT ANSWERS A small, positively charged particle of matter found in the
atoms of all elements.
neutrons - CORRECT ANSWERS neutral subatomic particle that, in conjunction with
protons, makes up the nucleus of every atom except ordinary hydrogen (whose nucleus has one proton
and no neutrons).
, electron - CORRECT ANSWERS A small particle with a negative charge that is found in all
atoms.
electrolyte - CORRECT ANSWERS A substance that breaks up into ions (particles with
electrical charges) when it is dissolved in water or body fluids. (Soluble inorganic molecules whose ions
will conduct an electricalcurrent in solution). - keep body fluids in balance
pH - CORRECT ANSWERS a measure of how acidic/basic water is
acid - CORRECT ANSWERS A chemical that gives off hydrogen ions in water and forms salts
by combining with certain metals. (a substance that can donate one or more of its hydrogen ions to
another substance).
alkali - CORRECT ANSWERS A chemical that can dissolve in water, combine with acids to
form salts, and make acids less acidic.
matter - CORRECT ANSWERS physical substance in general, as distinct from mind and
spirit; (in physics) that which occupies space and possesses rest mass, especially as distinct from energy.
describe the makeup of an atom - CORRECT ANSWERS an extremely small, positively
charged nucleus surrounded by a cloud of negatively charged electrons. The nucleus is positively
charged and contains one or more relatively heavy particles known as protons and neutrons. Atoms are
the basic building blocks of matter.
ionic bonds - CORRECT ANSWERS an attractive force between opposite charges, -->
lattices of ions, cations and anions
covalent bond - CORRECT ANSWERS he simultaneous attraction of two nuclei for one or
more pairs of electrons. The electrons located between the two nuclei are bonding electrons.
Verified Questions and Answers for an
A Grade
atomic number - CORRECT ANSWERS the number of protons in the nucleus of an atom,
which is characteristic of a chemical element and determines its place in the periodic table
atomic weight - CORRECT ANSWERS Another term for atomic mass which is the total
number of particles in the nucleolus , this the approximately equal to the number of protons and
neutrons, with a bit extra added by electrons. Calculated by adding the mass of protons and neutrons
molecular weight - CORRECT ANSWERS the sum of the atomic weights/ mass of all the
atoms in a molecule
ion - CORRECT ANSWERS an atom or molecule with a net electric charge due to the loss or
gain of one or more electrons. (An atom or molecule that has a positive or negative electric charge).
atom - CORRECT ANSWERS a particle of matter that uniquely defines a chemical element.
(smallest unit into which matter can be divided without the release of electrically charged particles).
molecule - CORRECT ANSWERS The smallest particle of a substance that has all of the
physical and chemical properties of that substance. (Two or more atoms joined via a covalent chemical)
proton - CORRECT ANSWERS A small, positively charged particle of matter found in the
atoms of all elements.
neutrons - CORRECT ANSWERS neutral subatomic particle that, in conjunction with
protons, makes up the nucleus of every atom except ordinary hydrogen (whose nucleus has one proton
and no neutrons).
, electron - CORRECT ANSWERS A small particle with a negative charge that is found in all
atoms.
electrolyte - CORRECT ANSWERS A substance that breaks up into ions (particles with
electrical charges) when it is dissolved in water or body fluids. (Soluble inorganic molecules whose ions
will conduct an electricalcurrent in solution). - keep body fluids in balance
pH - CORRECT ANSWERS a measure of how acidic/basic water is
acid - CORRECT ANSWERS A chemical that gives off hydrogen ions in water and forms salts
by combining with certain metals. (a substance that can donate one or more of its hydrogen ions to
another substance).
alkali - CORRECT ANSWERS A chemical that can dissolve in water, combine with acids to
form salts, and make acids less acidic.
matter - CORRECT ANSWERS physical substance in general, as distinct from mind and
spirit; (in physics) that which occupies space and possesses rest mass, especially as distinct from energy.
describe the makeup of an atom - CORRECT ANSWERS an extremely small, positively
charged nucleus surrounded by a cloud of negatively charged electrons. The nucleus is positively
charged and contains one or more relatively heavy particles known as protons and neutrons. Atoms are
the basic building blocks of matter.
ionic bonds - CORRECT ANSWERS an attractive force between opposite charges, -->
lattices of ions, cations and anions
covalent bond - CORRECT ANSWERS he simultaneous attraction of two nuclei for one or
more pairs of electrons. The electrons located between the two nuclei are bonding electrons.
