The first-order decay of radon has a half-life of 3.823 days. How many grams of radon remain after 7.22 days if the sample initially weighs 250.0 grams?

Methane, or CH4, is an example of a molecule whose atoms are held together by which of the following? A. hydrogen bonds B. covalent bonds C. metallic bonds D. ionic bonds

How many electrons in a silicon atom have n = 3 as one of their quantum numbers? How many electrons in a potassium atom have l = 0 as one of their quantum numbers? How many electrons in a mercury atom have n = 4 as one of their quantum numbers?

What is the definition of chemical equilibrium (p. s. I'm 13 and in college)

To what pressure must a gas be compressed in order to get into a 3.00 cubic foot tank the entire weight of a gas that occupies 400.0 cu. ft. at standard pressure?

When placed in a 100 mL cube-shaped box, a substance fills the cube and has a volume of 100 mL. When placed in a 50 mL tube, that same amount of substance fills the tube and thus has a 50 mL volume. What is the state of the substance?

In a closed system, the total heat given off by warmer substances equals the total heat energy gained by cooler substances (qwater = - qliquid).

What compound will not give oxygen on heating

Choose one property of water that makes it unique. Describe the property and explain the chemical or physical?

An object is dropped onto the moon (g m = 5 ft/s 2). how long does it take to fall from an elevation of 250 ft.?

Which type of luster gives the mineral the appearance of metal?