During which era did plants first appear on an island?

a. CenozoicB. Mesozoic

c. PaleozoicD. Precambrian

A pentavalent cation atom has 20 and 15 neutrons as protons. Find the electron quantity and mass number respectively. (40 pts.) a) 20 and 15 b) 15 and 20 c) 15 and 35 d) 35 and 15 e) 10 and 20

Which statement best explains the relationship between the electric force between two charged objects and the distance between them?

What is the difference between the electron shells, the subshells, and the orbitals?

Sulfur dioxide gas (SO2) and oxygen gas (O2) react to form the liquid product of sulfur trioxide (SO3). How much sulfur dioxide would you need to completely react with 6.00 g O2 such that all reactants could be consumed?

How many grams of o2 are in a 5.0 mol of the element?

The distance from santa maria to los Alamos is 15.9 mi. what is the distance in cm?

50*12*1 over 100 slove

Radiation used in the processing of food is intended to

Chandra wants to know how many moles are contained in 150.0 g CCl4 (carbon tetrachloride). What quantity of CCl4 should she use to make this conversion? a. number of moles b. molecular mass c. molar mass d. mole ratio

The equation for the production of methane is c + 2h2 (g) → ch4 (g). how many liters of hydrogen are needed to produce 20. l of methane?