How many moles of helium would occupy a volume of 1.255 L at a pressure of 1.47 atm at a temperature of 21℃?

Which statement describes covalent bases? they have hydroxide ions. they produce hydrogen ions. they are often amines. they are named the same as ionic compounds.

How does a scientist the government? a. the scientist tells people in society what to do. b. the scientist determines the policies that the government spends money on. c. the scientist provides unbiased information to the government. d. the scientist makes laws based on his or her research results.

The mass of a neutron is equal to the mass of a proton plus the mass of an electron. true or false false true