Atomic Theory
Who was the first person to describe matter as "atomos"
Democritus
What are subatomic particles that are neutral in charge
Neutrons
Change from regular notation to scientific notation: 670,400
6.704 x 105
This variable in an experiment is the one being changed by the scientist.
Independent Variable
How many significant figures are in 4.23 cm
What two particles are part of the nucleus of an atom
Protons and Neutrons
What are subatomic particles with a positive charge
Protons
Change from Scientific notation to regular notation: 4 x 105
400,000
Which step of the scientific method is an educated guess or a prediction
Hypothesis
How many sig figs are there 0.000008
1
Who created the model in which electrons orbit the nucleus in specific levels
Niels Bohr
Who is the first scientist to think that the atom was the smallest unit of matter
Democritus
Change from scientific notation to regular notation: 7.2 x 10-3
0.0072
What are the two types of data
Quantitative and Qualitative data
How many significant figures are there 100.000
6
Protons and Neutrons
How many protons are in an atom with an atomic number of 20, an atomic mass of 45?
20
Change from regular notation to scientific notation: 735,000,000
7.35 x 108
True or False: Experiments should be repeated over and over to see if the results are the same each time
True
Round 1047.78 to three sig figs
1050
What is the name of the experiment that Thomson did in which he passed an electric current through a vacuum tube
Cathode Ray Tube
Who was the scientist that shot particles at an atom and realized that the atom is made of mostly empty space
Rutherford
Change from scientific notation to regular notation -5.6 x 10-3
-0.0056
Name the steps of the scientific method in order
1. Observation / Asking a Question 2.Form a Hypothesis 3.Design a Controlled Experiment 4.Record and Analyze Results 5.Draw Conclusion
How many significant figures are there in 0.002040
4