1 what is the scientific method? steps scientists use to answer questions and solve problems
TRANSCRIPT
1
What is the scientific method?
Steps scientists use to answer questions and
solve problems.
2
What is the first step of the Scientific Process?
Ask a question or identify the problem
3
After you have asked the question, you are ready
to…
Form a hypothesis
4
Is it ok if your results do not support your
hypothesis?
YES
5
What should you do if your results do not
support your hypothesis?
Repeat investigation and change hypothesis if
necessary
6
What is the importance of the International System
of Units (SI)?
It is the oldest and most widely used system
7
What are the SI units for measuring LENGTH,
MASS, and VOLUME?
Meter, Kilogram, and Liter
8
What happens to a solid object with a density that is less than
water when it is placed in water?
It floats on top of the water
9
Is the explosion of fireworks is an example of a PHYSICAL
or CHEMICAL change?
Chemical change
10
Is grounding/grinding flour an examples of PHYSICAL
or CHEMICAL change?
Physical Change
11
What has mass and takes up space?
MATTER
12
What change of state happens if you open a bottle of perfume
after a period of time?
Evaporation
13
What is the melting point of ice the same as?
The freezing point of water
14
Will a liter of water boil at the same temperature as
a milliliter of water?
YES!
15
What change of state is solid to gas?
Sublimation
16
What change of state is EVAPORATION?
Liquid to gas
17
What change of state is liquid to gas?
CONDENSATION
18
What change of state is MELTING?
Solid to Liquid
19
Are boiling point, melting point and density examples of
physical or chemical properties?
PHYSICAL
20
What is a pure substance made of two or more elements that
are CHEMICALLY combined?
COMPOUND
21
Is FLAMMABILITY an example of a physical or
chemical property?
CHEMICAL PROPERTY
22
When elements form mixtures, do the elements keep their properties or form a new
substance?
KEEP their same properties
23
Which is NOT an method of separating a mixture of solids:
filtering, screening, evaporation?
EVAPORATION
24
What is the smallest particle in which an element can be divided and still be
the same substance?
ATOM
25
Which of the following has a POSITIVE charge:
proton, neutron, electron?
PROTON
26
Which of the following has a NEGATIVE charge:
proton, neutron, electron?
ELECTRON
27
Which of the following has a NEUTRAL charge:
proton, neutron, electron?
NEUTRON
28
Where is the nucleus of an atom and what does it
contain?
Center and hold the protons and neutrons
29
What is the type of change when a new substance is
formed with different properties?
CHEMICAL CHANGE
30
With a hair dryer, electrical energy is changed into
which type of energy: light, nuclear, thermal, chemical?
THERMAL
31
When you eat fruits and vegetables, what type of energy
are you taking in: thermal, sound, chemical, electrical?
CHEMICAL ENERGY
32
When is POTENTIAL ENERGY the greatest in
a roller coaster?
At the top of the first hill
33
What is THE ABILITY TO DO WORK called?
ENERGY
34
Conduction, convection, or radiation: when the end of a spoon in hot soup gets warm.
CONDUCTION
35
Conduction, convection, or radiation: when water boils in a pot, the water
moves in circular patterns?
CONVECTION
36
Conduction, convection, or radiation: when the coils of a portable heater warm a room?
RADIATION
37
Particles move fast, slide past one another.
LIQUIDS
38
Particles move very fast independent of each other,
bumping into each other wildly.
GAS
39
Particles are attracted to each other and vibrate in
place close together.
SOLID
40
Why are protons and electrons attracted to each other?
Protons have a positive charge and electrons have a negative charge…opposites
attract!
41
What do you see by sprinkling iron filings around a magnet?
Magnetic field lines
42
WHAT can be measured by counting how many waves pass by in a certain amount
of time: frequency, wavelength, or wave speed?
FREQUENCY
43
WHAT is the distance from any point on a wave to an identical point of the next
wave: frequency, wavelength, wave speed?
WAVELENGTH
44
WHAT is the speed at which a wave travels through a
medium: frequency, wavelength, wave speed?
WAVE SPEED
45
The SPEED of a sound wave depends on what?
The substance through which it travels: the
medium
46
WHITE LIGHT is the entire range of what?
All the colors of visible light combined together
47
Which results in a helpful INCREASE of friction:
sandpaper on wood, wax on skis, sand on an icy sidewalk?
Sand on an icy sidewalk
48
Which results in a helpful DECREASE of friction: force applied while scrubbing, oil added to a car engine, deep tread added to snow tires?
Oil added to a car engine
49
What illustrates MOTION by relating it to a reference point: hands of a clock relative to the
numbers, the distance a race car travels, the velocity of a train?
The hands of a clock
50
What are two factors used to determine the formula for speed: acceleration, velocity, distance, time, motion, reference point?
DISTANCE and TIME
51
Explain the difference between speed and
velocity.
One has direction
52
To produce a change in motion, a force must be
WHAT?
UNBALANCED FORCE