Answer:
At standard temperature and pressure, hydrogen is a colorless, odorless, tasteless, non-toxic, nonmetallic, highly combustible diatomic gas with the molecular formula H2. Since hydrogen readily forms covalent compounds with most nonmetallic elements, most of the hydrogen on Earth exists in molecular forms such as water
Explanation:
Answer:
TRIAL 1:
For “Event 0”, put 100 pennies in a large plastic or cardboard container.
For “Event 1”, shake the container 10 times. This represents a radioactive decay event.
Open the lid. Remove all the pennies that have turned up tails. Record the number removed.
Record the number of radioactive pennies remaining.
For “Event 2”, replace the lid and repeat steps 2 to 4.
Repeat for Events 3, 4, 5 … until no pennies remain in the container.
TRIAL 2:
Repeat Trial 1, starting anew with 100 pennies.
Calculate for each event the average number of radioactive pennies that remain after shaking.
Plot the average number of radioactive pennies after shaking vs. the Event Number. Start with Event 0, when all the pennies are radioactive. Estimate the half-life — the number of events required for half of the pennies to decay.
Explanation:
Answer:
Mass of each weight = 56.7 gram per piece
Explanation:
Given:
Lead’s density = 11.34 g/mL
Number of weights = 50
Volume of box = 250 mL
Find:
Mass of each weight
Computation:
Mass = volume x density
Mass = 250 x 11.34
Mass = 2,835 gram
Mass of each weight = Total Mass / Number of weights
Mass of each weight = 2,835 / 50
Mass of each weight = 56.7 gram per piece
Answer:
a) Theoretical yield of ethanol = 34.778 g
b) % yield of ethanol = 37.38%
Explanation:
a)
C6H12O6 → 2 C2H5OH + 2 CO2
Molar mass of glucose = 180.156 g/mol
Molar mass of ethanol = 46.07 g/mol
amount of glucose taken = 68.0 g
No. of mole = Amount of substance in g/Molar mass
[text]No. of mole = \frac{68.0\;}{180.156\; g/mol} =0.37745 mol[\text]
from reaction stoichiometry, one mole of glucose fermented two form 2 mole of ethanol.
therefore, 0.37745 mol of glucose will form 0.37745*2 moles of ethanol.
No. of moles of ethanol formed = 0.7549 mol
theoretical yield of ethanol = 0.7549 x 46.07 = 34.778 g
b)
Actual yield = 13.0 g
Theoretical yield = 34.778 g
= 37.38%
Explanation:
What happened to the ruler when you suddenly released it
