Grade 8 revision Flashcards
is anything that has mass and takes up space.
matter
the amount of matter in an object.
mass
the gravitational force on an object.
weight
a tool used to determine mass
triple beam balance
a tool used to measure weight
spring scale
the amount of space that an object
takes up, or occupies.
volume
the amount of matter in a given volume.
Density
is a measure of how well electric currents move
through a substance.
electric conductivity
is the rate at which a substance transfers heat.
thermal conductivity
the temperature at which it changes from a solid to a
liquid.
melting point
the point at which the substance boils.
boiling point
the ability of a substance to dissolve
in another substance.
solubility
the ability of a substance to be
rolled or pounded into various shapes.
malleability
describes the ability of a substance to
change into a new substance with different properties.
chemical property
the ability of a substance to burn.
flammability
the ability of a substance to interact
with another substance and form one or more new
substances.
reactivity
The change in appearance, shape, or
size of a substance.
physical change
the process by which one or more substances change into entirely new substances.
chemical change
states that in ordinary chemical and
physical changes, mass is not created or
destroyed. It is only transformed into
different substances.
The law of conservation of mass
first organized the
elements by arranging them in order
of increasing atomic mass.
Dmitri Mendeleev
reorganized Mendeleev’s periodic
table in order of increasing number of protons, or
atomic number.
Henry Moseley
an abbreviation for the element’s name.
chemical symbol
the weighted average of the masses of all the naturally
occurring isotopes of that element.
average atomic mass
elements that are shiny and conduct
heat and electricity well.
metals
poor conductors of heat and electricity,
and are often dull and brittle.
non-metals
elements that have some properties of
metals and non-metals. They border the zigzag line.
Metalloids
elements placed below the
table to allow the table to be narrower.
lanthanides and actinides
