How many dots are shown in the electron dot diagram for calcium, in group II and period 4 with 20 protons and 20 electrons? a. four c. eight b. two d. twenty

What part of the graph would indicate a change is taking place

According to the below equation, how many moles of SO2 are required to generate 1.43*1024 water molecules? 2H2S+SO2→3S+2H2O

Does mercury have any reconnaissance satellites? (science)

What's a chemical change that could occur with a piece of wood?

When swimming the 5000 meter freestyle race, a swimmer travels at a steady pace of 68 seconds for each lap. Each lap of the pool is 100 meters. How long will it take for this swimmer to swim the 5000 meters

A reaction is in equilibrium as shown: a + b c + d. calculate the equilibrium constant if the final concentrations stabilize at: a = 9.60 m b = 10.0 m c = 4.00 m d = 4.00 m 0.167 0.408 2.45 5.99

When 10 liters of a gas at 1 atm is compressed to 3 liters at constant temperature, what property of the gas changes?

What happens to the particles of a substance when thermal energy is added to the substance? A.) it's particles do not vibrate at all. B.) it's particles move faster. C.) it's particles move closer together. D.). It's particles move slower.

Suppose that you drop three objects into a glass of water: a piece of styrofoam, a piece of oak, and a gold ring. Which float, and which sink? density of styrofoam: 0.005 density of gold ring: 19.32 density of oak: 0.70

How many molecules following formula 3Al2 (SO4) 3