Answer:
water because the other two were formed through a chemical process
Answer:
The time taken the same amount of ammonia to effuse through the same barrier under the same conditions is 2.76 minutes.
Explanation:
Let the volume of the helium gas be = V
Time taken by the helium gas = t = 1.34 min
Effusion rate of helium gas = 
If V volume of ammonia effuse through same porous barrier the effusion rate of ammonia gas will be given as:
Using Graham's Law.
This law states that the rate of effusion or diffusion of gas is inversely proportional to the square root of the molar mass of the gas. The equation given by this law follows the equation:
Molar mass of helium gas = M = 4 g/mol
Molar mass of ammonia gas = M' = 17 g/mol
The time taken the same amount of ammonia to effuse through the same barrier under the same conditions is 2.76 minutes.
Answer:
The atomic number is the number of protons in the nucleus and also the number of orbiting electrons. The mass number is the number of protons and neutrons in the nucleus.
The mass number minus the atomic number is the number of neutrons in the nucleus.
An isotope will have a different atomic mass.
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:
Alchemists advanced the tools and procedures for working with chemicals. Alchemists also developed methods for sorting out mixtures and cleansing chemicals. They designed equipment that is still in use today including beakers, flasks, tongs, funnels, and the mortar and pestle. Also, Alchemists backed to an unbelievable variety of what would later be acquainted as chemical industries: basic metallurgy, metalworking, the invention of inks, dyes, paints, and cosmetics, leather-tanning, and the preparation of extracts and liquors.
