Introduction to Science
What are the main branches of natural science are
Life, Physical and Earth Science
Molar mass is defined as..
the mass in grams of one mole of a substance
the process of a liquid becoming a gas is called
evaporation
The gases nobles are located in.
Group 18
Which SI prefix means one one-hundred (1/100)?
centi-
Scientific law is..
a description of a natural event
An atom's mass number equals the number of..
protons plus the number of neutrons
the process of a liquid becoming a solid is called
freezing
The halogens are located in
group 17
a tool used by physicists to smash atoms is a..
particle accelerator
Scientist test a hypothesis by..
doing experiments
A unified atomic mass unit is equal to..
one-twelfth the mass of a carbon-12 atom.
A state of matter that is not a fluid is
solid
What common thing have the elements of group 1?
That are alkali metals
when ice melts to form liquid, energy is
released
A loaf of bread weighs 1,362 g. the weight in kilograms is.
1.362 kg
Avogadro's number is defined as the number of particles in..
One mole substance
which state of matter has a definite volume, but not a definite shape
liquid
What common thing have the elements of group 2?
That are alkaline-earth metals
atoms have no electric charge because they
have equal number of electrons and protons
What do scientist who do pure science do?
they do experiments to find out about the world.
Atoms of the same element are exactly alike, this according to
Dalton's theory
Unlike gas, plasma...
conduct electric current
What common thing have the elements of group 3-12?
That are transition of metals
what is the mass number of an element that has 19 protons, 19 electrons and 20 neutrons?
39