Which of the following steps in a star's life cycle takes the longest?

A.

fusion of carbon atoms

B.

formation of a protostar

C.

fusion of hydrogen atoms

D.

fusion of helium atoms

The diagram shows Niels Bohr's model of an atom. A small green circle labeled Proton is surrounded by 4 concentric circles.

Which of the following molecules or ions has a bent shape? A: CIO4 B: PH3 C: OF2 D: PCI5

If a 1.45 M solution has 2.43 g HCl dissolved, what is the volume of solution? (Change g Hl into mol using molar mass)

part of the SO2 that is introduced into the atmosphere by combustion of sulfur containing compounds ends up being converted to sulfuric acid, H2SO4. How many moles of H2SO4can be formed from 5.0 mol SO2., 4.0 mol O2 and 20.0 mol H2O?

1. What is the first step when calculating the molar mass of a compound? a) Multiply the total number of atoms in the compound by the combined molar mass. b) Add the total number of atoms for each element of the compound together.

If an element has 1 valence electrons, how many dots will be in the elements dot diagram?

What is the temperature of a gas at STP?

What is the numerical meaning of centimeter

You run an experiment to test the effects of temperature on solubility. What would you heat? A.) solvent B.) solute C.) the room B.) the beaker

What happens when a firework is ignited?