WorksheetsChemistry Unit Exam 1 Review Part 1
Total questions: 13
Worksheet time: 34mins
Calculate the number of Carbon atoms in 2.5 gram sample.
1.25 x 1023 atoms C
0.208 atoms C
1.50 x 1024 atoms C
1.80 x 1025 atoms C
Calculate the number of moles of sodium in 72 grams of sodium.
1656 moles Na
1.88 x 1024 moles Na
0.319 moles Na
3.13 moles Na
Calculate the mass, in grams, of 4.00 moles of aluminum.
0.148 grams Al
107.92 grams Al
2.40 x 1024 grams atoms
52 grams Al
In a mass spectrometer you are measuring a sample of Zirconium. The mass spectrometer got reading for multiple isotopes, Zr- 90, Zr- 91, Zr- 92, Zr-94, and Zr- 96. Which of the following isotopes was deflected the most?
Zr- 90
Zr- 91
Zr- 92
Zr-94
Zr- 96
If you have 28 grams of copper what is the volume of the sample?
250 mL
1.68 x 1025 mL
3.13 mL
0.319 mL
Click all that apply: In Rutherford’s Golf Foil experiment he observed that--
The atom was mostly empty space
The atom had no mass
The nucleus was small
The nucleus was dense
The alpha particle was negative
Click all that apply: In Rutherford’s Golf Foil experiment he observed that--
The alpha particle was positive
The nucleus is positive
The nucleus is negative
Most particles deflected
The mass is contained in the nucleus
JJ Thomson used his cathode ray tube make an innovative discovery on the subatomic particles of an atom. One of them in particular. He discovered that the particle ---
Had no mass
Had very small mass
Had a very large mass
Carried a positive charge
Which total mass is the smallest?
The mass of 2 protons
The mass of 2 neutrons
The mass of 2 electrons
The mass of 1 electron plus the mass of 1 proton.
Which of the following is NOT an isotope?
Neon-20
Fluorine-20
Fluorine-21
1. Use the data in the chart…
a. What would our average atomic mass be closest to?
b. Calculate the percent abundance of each isotope
c. Calculate the average atomic mass of the sample.
d. Which element do you believe this is?
Which of the following is a true statement?
Al3+ has 16 electrons
S2- has 2 electrons
Br1- has 34 electrons
Ca2+ has 18 electrons
A neutral atom of 37Cl has :
37 protons, 37 neutrons, and 37 electrons
17 protons, 37 neutrons, and 17 electrons
17 protons, 20 neutrons, and 37 electrons
17 protons, 20 neutrons, and 17 electrons
