Show:
LD50
Counting by Weighing
Avogadro's Number
Molar Mass
Regular vs Diet Soda
100
What does the LD50 stand for?
The Lethal Dose of a toxic substance that kills 50% of the population exposed to it.
100
How can you count a large number of jellybeans easily?
Find the mass of all the jellybeans, and then divide that by the mass of 1 jellybean.
100
What is Avogadro's Number?
6.02 x 10^23 or 602 sextillion
100
What is the unit for Molar Mass?
grams per mole, or g/mol
100
What is the sweetener used in regular soda?
What is fructose or table sugar?
200
What is more toxic: Bleach (LD50 = 850mg/kg) or Caffeine (LD50 = 150mg/kg). Why?
Bleach, because its LD50 is smaller.
200
A pile of pennies weighs 175g, and an individual penny weighs .25g. How many pennies are in the pile?
700 pennies
200
What is Avogadro's Number used for in chemistry?
To count atoms.
200
What does the Molar Mass measure?
The mass of a molar quantity.
200
What is the sweetener found in Diet Soda?
Aspartame
300
What is the lethal dose of bleach (LD50 = 850mg/kg) for a 60kg person?
51,000mg
300
A bag of arsenic pills weighs 165g, the bag itself weighs 15g, and a single pill weighs 6g. How many arsenic pills are in the bag?
25 arsenic pills.
300
What contains more atoms, 1 g of Hydrogen or 12 g of Carbon?
They contain the same amount of atoms, because each is 1 moles worth.
300
What is the Molar Mass of Carbon monoxide (CO)? Include the proper units.
28 g/mol
300
What is the Molar Mass of Fructose (C6H12O6)?
180 g/mol
400
What is the lethal dose of caffeine (LD50 = 150mg/kg) for a 110lb person? (1lb = 2.2kg)
7,500mg
400
Suppose that you have 50g of small rice, and 50g of large jellybeans. What sample has more pieces?
The sample of rice.
400
How many atoms of Oxygen are in a 16g sample?
602 sextillion or 6.02 x 10^23 atoms of Oxygen.
400
What is the Molar Mass of Potassium Cyanide (KCN)? Use the proper units.
65g/mol
400
From class, what had more moles of sweetener, Regular Soda or Diet Soda?
Regular Soda
500
How many 300mg caffeine pills (LD50 = 150mg/kg) would a 50kg person have to take to die?
25 caffeine pills
500
Suppose that you calculated the number of beans as 1327, but the actual value is 1342. What is the percent error?
1.1%
500
How many moles of Oxygen are in a 32 g sample?
2 moles
500
How many moles are in a 195g sample of Potassium Cyanide?
3 moles
500
What is sweeter, the sugar found in regular soda, or the artificial sweetener found in diet soda?
The artificial sweetener is sweeter.