2. $$$ Review $$$
Atomic Theory
Matter
Measurement

3. $1 How many significant figures does the following number have? 40.0085 $1

4. How many significant figures does the following number have? 0.005460$1

5. $1 How many significant figures does the following number have? 10000

6. $1 How many significant figures does the following number have? 10000.5 $1

7. The density of an object is 12 g/ml and it has a mass of 4 grams
The density of an object is 12 g/ml and it has a mass of 4 grams. What is its volume?
0.33 mL $2

8. $3 Name the three fundamental subatomic particles of the atom.
neutron, proton, electron $3

9. The smallest particle of an element that has the properties of that element
atom $1

10. $1 Is orange juice a homogeneous or heterogeneous mixture?

11. $1 The number of protons in an element is known as its ______.
atomic number $1

12. $2 The mass number is defined as the number of …….
protons plus neutrons $2

13. An element has an atomic number of 51
An element has an atomic number of 51. How many protons and electrons must this atom have if it is neutral?
51 protons, 51 electrons $2

14. The data is precise, but inaccurate
A cup is supposed to weigh g. You weigh it 5 times and get the following gram measurements , 433.1, 432.6, 433.0, What can be said about this data in terms of precision and accuracy?
The data is precise, but inaccurate $2

15. A cup is supposed to weigh 500. 0 g
A cup is supposed to weigh g. You weigh it 5 times and get an average mass of g. What is the percent error in the mass?
13.4% $2

16. Which subatomic particle has differing amounts in isotopes?
neutrons $1

17. How many protons, electrons, and neutrons does a neutral atom with an atomic number of 85 and a mass number of 210 have?
85 p, 85 e, 125 n $3

18. How many protons, electrons, and neutrons does a -3 charged atom with an atomic number of 85 and a mass number of 210 have?
85 p, 88 e, 125 n $3

19. Who discovered the electron?
J.J. Thompson $2

20. What device did J.J. Thompson use to discover electron?
Cathode Ray Tube $2

21. Which researcher discovered the proton?
Ernest Rutherford $1

22. Can you name three conclusions from Rutherford’s gold foil experiment.
Atom is mostly empty space (the nucleus is small compared to entire size of atom)
Most of the mass of the atom is in the center
The positive charged particle (proton) must be in the center of the atom $3

23. Who is considered the father of modern chemistry?
Robert Boyle $1

24. Element X contains three naturally occurring isotopes with masses of 78.0, 79.0, and 80.0 amu. What data is needed to calculate its average atomic mass?
The natural abundance in percent of each isotope (Can you do these calculations?) $2

25. $2 What was John Dalton’s main contribution to the theory of the atom?
Elements are made of very small particles called atoms $2

26. T or F. An electron has very little mass when compared to a proton.
True $1

27. Which element is shown below.X 93 41 Nb $1

28. T or F. A neutron and proton have roughly the same mass and charge.
False, almost same mass but different charge $1

29. T or F. A neutron and electron have different masses but the same charge.
False, different masses but different charge $1

30. $4 What are the names of the quarks?
Up, down, strange, charm, beauty (bottom), truth (top) $4

31. Which type of cell has a nucleus. A prokaryote or an eukaryote
Which type of cell has a nucleus? A prokaryote or an eukaryote? (Can you remember your biology
eukaryote $1

32. You should be able to calculate average atomic masses.
You should understand the atomic theory timeline and the various models of the atom as they developed!!!
You should be able to calculate average atomic masses.