NAS 2 CHALLENGE EXAM
(QUESTIONS AND THEIR EXPECTED
CORRRECT ANSWERS)
Define science
An organized way of gathering and analyzing evidence
about the natural world.
List the basic steps in the scientific method.
observation, hypothesis, experimentation, data analysis,
conclusion
Name the metric base unit for mass
gram
Name the metric base unit for volume
liter
Name the metric base unit for length
meter
Define body temperature in Celsius
37 degrees Celsius
Define room temperature in Celsius
20 degrees Celsius
At what point does water freeze in Celsius
0 degrees Celsius
At what point does water boil in Celsius
100 degrees Celsius
Define matter
Anything that has mass and takes up space
Define atoms
, smallest unit of matter
Define molecules
two or more atoms bonded together
Define elements
pure substances that cannot be broken down chemically
into simpler kinds of matter
Name the subatomic particles of an atom
proton, neutron, electron
Where is the proton located?
inside the nucleus
Where is the neutron located?
inside the nucleus
Where is the electron located?
around the nucleus
Which subatomic particle is responsible for
distinguishing one atom from another?
protons
Which subatomic particle is responsible for bonding?
electrons
Define atomic number
the number of protons in the nucleus of an atom
Name four elements most important to living
organisms
H - hydrogen
C - carbon
N - nitrogen
O - oxygen
What is an ionic bond?
A chemical bond that's formed when an atom transfers an
electron to another Atom
What is a polar covalent bond?
(QUESTIONS AND THEIR EXPECTED
CORRRECT ANSWERS)
Define science
An organized way of gathering and analyzing evidence
about the natural world.
List the basic steps in the scientific method.
observation, hypothesis, experimentation, data analysis,
conclusion
Name the metric base unit for mass
gram
Name the metric base unit for volume
liter
Name the metric base unit for length
meter
Define body temperature in Celsius
37 degrees Celsius
Define room temperature in Celsius
20 degrees Celsius
At what point does water freeze in Celsius
0 degrees Celsius
At what point does water boil in Celsius
100 degrees Celsius
Define matter
Anything that has mass and takes up space
Define atoms
, smallest unit of matter
Define molecules
two or more atoms bonded together
Define elements
pure substances that cannot be broken down chemically
into simpler kinds of matter
Name the subatomic particles of an atom
proton, neutron, electron
Where is the proton located?
inside the nucleus
Where is the neutron located?
inside the nucleus
Where is the electron located?
around the nucleus
Which subatomic particle is responsible for
distinguishing one atom from another?
protons
Which subatomic particle is responsible for bonding?
electrons
Define atomic number
the number of protons in the nucleus of an atom
Name four elements most important to living
organisms
H - hydrogen
C - carbon
N - nitrogen
O - oxygen
What is an ionic bond?
A chemical bond that's formed when an atom transfers an
electron to another Atom
What is a polar covalent bond?
