Scientific Method and Research
What is the first step of the scientific method?
Ask a question
What is a theory?
Explain why something happens, It can be supported but never proved because you can't see it
What is an example of a derived unit?
More than one base unit. M/s, Volume, Density
What is 6500 in scientific notation ?
6.5x10^3
You can look at atoms how? A. Macroscopically B. Microscopically C. Submicroscopically
Submicroscopically
The symbol for sodium is Na, it has a grey colour and its melting point is 897.4. What is a QUANTITATIVE DATA of sodium
Melting Point, 897.4
What does the ozone layer protect us from?
Ultraviolet (UV) radiation from the sun
Name the 7 base units
Time (s), Mass (kg), Length (m), Temperature (K), amount of substance (mol), Luminous intensity (cd), Electric Current (A)
Salama measured 10.1, 15.6 and 13.4 in her experiment. The accepted value is 20. Is she accurate or precise?
Not accurate or precise
What do we use to look at atoms
Scanning Tunnelling Microscope
Name the 7 steps of the scientific method
Ask a question, Do background research, Make a hypothesis, Do the experiment, Analyse Results, Make a conclusion, Share results
What was damaging the ozone layer?
Chloroflurocarbons (CFCs)
Convert 2.5 milligrams to decigrams
0.025 decigrams
How many significant figures are in 0.004005?
Four
Name the 3 scientists that made theories on matter. Who was the least correct?
Democritus, John Dalton, Aristotle
Aristotle was the least correct as he said matter was made of earth fire air or water
A scientist is measuring the effects of temperature on the growth of chickens. What is the independent and dependent variable here?
Independent = WE CHANGE, Temperature
Dependent = WE MEASURE, Growth of chickens
My mass is 62kg and my weight is 100N. I go to the top of a mountain. What is my mass and weight now?
My mass is the same, my weight is less on the mountain because there is less gravity
What is (2x10^3) x (4x10^5)
(8x10^8)
What is (6.2x10^7) + (4.1x10^8)?
4.72x10^8
Name the 3 scientists that discovered the electron and what they did
Sir William Crookes, used cathode ray tubes
Robert Millikan, used oil drop apparatus
JJ Thomson, plum pudding model
Name the 3 types of research and their definitions
Pure research: To learn more
Applied research: To solve a problem
Chance Discovery: Accidental find
How is the ozone layer made?
O2 splits to become O. The O then joins an O2 to become O3
What is the difference between linear INTERPOLATION and linear EXTRAPOLATION
Extrapolation is estimating the data after the line has stopped
What is the % error when a scientist gets 41 in the experiment but the accepted value is 50?
41 - 50 = -9
-9/50 x 100 18%
Describe what Ernest Rutherford discovered and what the experiment was
Protons and a nucleus. Gold foil experiment. Shot alpha particles at gold foil. Some of the particles went straight through, some bounced back and some went to the side.