The what of an element is the average mass of all isotopes of that element

How many hydrogen atoms are in a cycloalkane with 8 carbon atoms?

Care needs to be taken when adding acid to base because

Will a double replacement reaction occur if a potassium hydroxide solution is mixed with a lead (II) nitrate solution? Briefly explain.

Which process would most likely be employed to separate a mixture of sand and water?

Intermolecular forces Select one: a. form dissociated ions. b. are electrostatic attractions between different molecules. c. evenly distribute electrical charge among all atoms in a sample. d. separate atoms and ions from one another. e.

A gas has a volume of 27.5 L at 302 K and 1.40 atm. How many moles are in the sample of gas? A. 0.0401 mol B. 0.645 mol C. 1.55 mol D. 2.14 mol

Why does the body of the bird covered with feathers?

One molecule of caffeine contains 8 atoms of carbon, 10 atoms of hydrogen, 2 atoms of oxygen, 4 atoms of nitrogen. write the formula for caffeine with the elements in the order they are given.

A piece of magnesium metal is heated in the presence of chlorine gas, and a reaction takes place. What compound will most likely be produced? A. Mg2C1 B. MgCl3 C. MgCl2 D. MgCI

What is the pressure of the gas in this mercury manometer if h = 81 mm and atmospheric pressure is 749 mmHg