Unit 1 Scientific Method and Measurement
Write 49,045,000,000 in scientific notation.
4.9045x1010
If volume is lowered, what happens to the pressure of a gas?
increases
How many neutrons are in Cu-65?
36
The attraction an element has to electrons is known as its:
electronegativity
Convert 5 Km to mm
5,000,000
5.0 g of magnesium reacted with oxygen gas to produce 8.3 g of magnesium oxide. How many grams of oxygen reacted with the magnesium?
3.3 g O2
How many electrons would iron have if it has a charge of +3?
23
Same valence electrons, oxidation number, chemical properties, same electron configuration ending (s2, p4, etc.)
How many sig figs? 0.002040
4
A helium balloon at 25oC and 1.40 L is brought outside, where the temperature is 14oC. What is the new volume of the balloon?
1.35 L
What type of nuclear decay is responsible for the energy of the sun and other stars?
fusion
What is the noble gas notation for Bismuth?
[Xe]6s24f145d106p3
The sum of 44.56 + 2.0 + 0.00058 + 3000 =
(Report your answer to the correct number of sig figs)
3047
What is the density of a 54.0 gram object that has a length of 5.0 cm, width of 6.0 cm, and height of 7.0 cm?
0.26 g/mL
If Radon - 226 undergoes alpha decay, what element does it become? What about beta decay?
alpha - Polonium
beta - Francium
Which of the following elements has the least ionization energy? Mg, K, Ca, Rb
Rb
If you go to school for 180 days each school year and each school day is 7 hours long, how many hours are spent in school in one school year? Bonus points: If you are 17, currently finishing up your junior year and have been in school since kindergarten, what percentage of your life (in hours) have you spent in school (assume same length of school day and school year as above)?
1,260 hours
~10%
500.0 liters of a gas in a flexible-walled container are prepared at 700.0 mmHg and 200.0 °C. The gas is placed into a tank under high pressure. When the tank cools to 20.0 °C, the pressure of the gas is 30.0 atm. What is the volume of the gas?
9.51 L
A 200 g sample of Iodine - 135 has been decaying for 33 hours. Now only 6.25 g remain. What is it's half-life?
6.6 hours
For Beryllium, what is its valence electron #, oxidation number, period #, group #, classification (m, nm, ml), family name, and orbital notation?
2, +2, 2, 2, m, alkaline earth metals, 1s[^v] 2s [^v]