Of the following prefixes which is the largest?
centi
kilo
micro
milli
kilo
100
A series of logical steps that is followed in order to solve a problem is called...
The scientific method
100
Matter is anything that has ______ and takes up ______. The law of conservation of mass states that matter can not be _________ or _________.
Fill in the blanks.
mass
space
created
destroyed
100
What is the smallest unit of matter that cannot be broken down by chemical means?
an atom
100
What type of simple machine is an axe?
wedge
200
What are the base metric units for measuring mass, length and volume?
mass - grams
length - meters
volume - liters
200
How would a scientist test a hypothesis?
By conducting an experiment.
200
What is occurring when a liquid rapidly changes from a liquid to a gas?
the liquid is boiling
200
What is the charge of an electron?
negative
200
What is a compound machine?
two or more simple machines working together
300
If Jimmy is 1.45 meters tall what is his height in centimeters?
145 cm
300
For a hypothesis to become a theory what must happen?
it must be tested by many observations.
300
the process of a gas becoming a liquid would be known as...
condensation
300
Is combining hydrogen with oxygen to form water a physical or chemical change?
chemical
300
How can you increase the efficiency of a machine?
reduce friction
400
Express the following number in scientific notation.
56,300,000,000
5.63 x 10^10
400
How could you describe technology?
the application of science.
400
Would saltwater be a homogeneous or heterogenous mixture?
homogeneous
400
What two subatomic particles are located in the nucleus of an atom? What is the charge of a nucleus?
protons and neutrons
positive
400
How does a machine make work easier?
by decreasing the amount of force, changing the direction of the force or increasing the distance over which the force is applied.
500
How is accuracy different than precision?
accuracy - close to the true value
precision - exact measurement
500
What are the three main branches of natural science?
life science, physical science, and earth science
500
How could you make salt dissolve more quickly in water?
heating, stirring, adding more water
500
The horizontal rows on the periodic table are _________ while the vertical columns are __________.
rows - periods
columns - groups
500
How could you increase the amount of pressure inside a balloon?