What is the half-life of sodium-25 if 1.00 gram of a 16.00-gram sample of sodium-25 remains unchanged after 237 seconds?

(1) 47.4 s (3) 79.0 s

(2) 59.3 s (4) 118 s

What is the name of amount of mass in a specific

How many molecules of oxygen are found in 3.00 moles of oxygen

True or False: Jumpstart is a fast-paced method for identifying problems and solutions in a single session that can be used within other methods such as Rummler-Brache, Scrum, and TQM.

Which statement is NOT true about the elements flourine, chlorine, and iodine? a) they are all halogens b) They react easily with metals c) They are similar to noble gases d) They are all nonmetals

Problem when you go camping and have a fire to roast marshmallows, what happen to the wood at the end of the night? it burns and we call this a chemical change. however the next morning there's less material in the fire pit than the night before.

A sample of methane gas occupies 4.50 gallons at a temperature of 80.0 F. If the pressure is held constant, what will be the volume of the gas at 100. degrees C?

Jack wants to know if it takes longer for warm water to freeze into ice cubes than cold water, so he performed the following experiment. Jack placed 50 mL of water in the refrigerator and allowed it to cool to a temperature of 4°C.

How to calculate average concentration

Suppose that you measure a pen to be 10.5 cm long. Convert this to meters.

How are amounts of hydrogen and oxygen gas made from the electrolytic decomposition of water related to the chemical formula of water?