First Half Life
Second Half Life
You Matter
Mixed Bag
100
I am atomic number 19... I am helpful before most sporting events...
What is Potassium?
100
Write the strengths of the radioactive particles in order from strongest to weakest.
What is gamma > beta > alpha
100
What separation technique separates substances based on their density.
What is decantation?
100
What did Rutherford discover?
What is a nucleus?
200
Barium has a charge of 2+. How many electrons does it have?
What is 54 electrons?
200
Write an example of fusion. Your example must involve chemical formulas.
element + element - > new element
i.e. H + H --> He
200
Give an example of a heterogeneous and homogenous mixture
several examples:
heterogeneous: salad, cookie, opened soda bottle
homogenous: vanilla milkshake, ketchup, vinegar
200
What is the length of the line below?
What is 3.20 cm?
300
How many protons, neutrons, and electrons are in the following atom:
What is:
31 protons, 40 neutrons, and 31 electrons?
300
A 64.0 gram sample of radioactive isotope decays to 1.00 grams in 360.0 seconds. What is the half-life of the isotope?
What is 60 seconds?
300
List all the phase changes that are exothermic.
What is condensation, freezing, and deposition?
300
Solve the problem:
56.098 m x 349.23 m x 23.0 m = ?
What is 4.51 x 105 m3 (has to be three sig figs)
400
John Dalton was one of the first scientists to propose a comprehensive atomic theory. However, later scientific discoveries showed that some of his original ideas were incomplete or incorrect.
List both of the false theories for full points.
1) atoms of an element are completely identical
and
2)Atoms are indivisible and indestructible
400
What atom is produced when Tungsten (W) -184 undergoes beta decay? Write the equation.
(184,74) W -> (184,75) Re + (0,-1) e
400
Using the heating curve below:
list the letter segments for the phase changes that are exothermic.
What are segments E->D and C->B?
400
A chemist has a sample containing 2.50 moles of pure copper (Cu). How many copper atoms are in this sample?
How much is 1.51 x 1024 atoms?
500
Magnesium has two naturally occurring isotopes. Magnesium – 24 and Magnesium -25. What are the percent abundances of each isotope? Average atomic mass of Magnesium = 24.30 amu
Mg -24 = 69.00%
Mg - 25 = 31.00%
500
The half-life of a radioactive isotope is 5,730 years. You currently have 25.0 grams of the original sample. How many grams would have been in the sample 11,460 years ago?
What is 100 grams?
500
Using the phase diagram below:
What is the approximate melting and boiling point of this substance?
What is a melting point of ~100 Celsius and a boiling point of ~400-430 Celsius?
500
The half life of element A is 250.0 years.
You currently have 48.5 grams of the original sample. How many grams would have been in the sample 1500 years ago?
How much is 3,104 grams?