An atom of magnesium has an atomic number of 12 and a mass number of 24. how many protons plus neutrons are in the nucleus

Calculate the pressure exerted by 66.0 g of CO2 gas at - 14.5°C that occupies a volume of 50.0 L

What volume will 145 g of butane occupy at 745 torr and 35 ∘c?

Which statement concerning elements is true

Why is galvanized steel preferred for outdoor uses?

Is always an that of the from The radius of a which it is derived. O atom, smaller, cation O anion, smaller, atom o cation, smaller, atom O atom, smaller, anion

Tear gas has the composition 40.25% carbon, 6.19% hydrogen, 8.94% oxygen, 44.62% bromine. what is the empirical formula of this compound?

Explain why ships traveling from east to west across the Atlantic take days longer than ships traveling the same distance from west to east.

In a titration 25.0 ml of a. 20 M NaOH solution is used to neutralize 10.0 ml of HCl. Write the equation for this neutralization reaction and calculate the molarity of the acid.

4*C: 4cm 8*C: 10cm 12*C: 14cm 16*C: 18cm 20*C:24cm 24*C: 12cm what is the independent variable, dependent variable and three constant variables?

In the chemical laboratory, why do scientists use a mortar and pestle? a. to increase surface area of a solute b. to decrease surface area of a solute c. to increase temperature of a solute d. to decrease temperature of a solute