If the atomic number of an element is 6 and its mass number is 20, how many neutrons are in the atom's nucleus?

Calculate the atomic mass of silicon. The three silicon isotopes have atomic masses and relative abundances of 27.9769 amu (92.2297%), 28.9765 amu (4.6832%) and 29.9738 amu (3.0872%). Show your work.

Free radical chlorination of ethane can produce higher halogenation products (dichlorinated, trichlorinated, etc ...) in addition to chloroethane.

A sample of gold (Au) has a mass of 35.12 g. a. Calculate the number of moles of gold (Au) in the sample and record in Table 1. Show your work. b. Calculate the number of atoms of gold (Au) in the sample and record in Table 1. Show your work

Warming a gas at constant volume and a pressure of 1.50 atm from 27 degrees Celsius to 127 degrees Celsius gives a final pressure of

What final temperature (∘c) is required for the pressure inside an automobile tire to increase from 2.19 atm at 0 ∘c to 2.37 atm, assuming the volume remains constant?

What was the result of the atomic theory?

Explain mitosis and meiosis in your own words.

What device changes mechanical energy into electrical energy? Question 4 options: transformer generator copper wire light switch

Reaction rates are affected by how often the particles collide true false

A 25 N and 5 N force pull to the right. Friction is 10 N. If the object is 5 kg, find the net force and acceleration.