You find a rock that contains equal amounts of potassium-40 and argon-40. how old is it?

2. When two forces act on an object in opposite directions, you calculate the net force by? A. Dividing the two forces. B. Subtracting the two forces C. Finding the average of the two forces D. None of the above

Draw Bohr model of atom with atomic number 16 and name the element. What is the valency of the atom? What type of ion does it form and what will be the value of the charge on the ion produced? Justify the answer.

Which electron transition in an excited atom results in a release of energy?

Who is the father of chemistry?

Why does the heat capacity decreases as atomic mass increases?

Can y'all give me some examples of physical changes

A nitrogen-containing compound shows no absorption band at ∼3400cm-1 and no absorption bands between ∼1700cm-1 and ∼1600cm-1. what class of compound is it

What is the mass of 35.2 ml of a solution that has a density of 1.12 g/cm (in dimensional analysis)

What is the molecular geometry, or shape, of beryllium chloride (becl2) ?

What is the best category for nf3? 1. amphoteric ion 2. lewis acid 3. salt 4. bronsted-lowry acid 5. arrhenius acid 6. arrhenius base 7. lewis base 8. weak electrolyte?