Which statement descibes the type of change and the chemical properties of the product and reactants

An isotope has a half-life of 10 minutes. after 20 minutes, what percentage of the original nuclei remain?

A 7.0 L sample of methane gas is collected at 50.0°C. Predict the volume of the sample at 0°C.

About how old is the sun? 1.2 billion years 4.6 billion years 6.4 billion years 8.2 billion years

The forces between water molecules are stronger than the forces between ethanol molecules. which illiquid would probably be most difficult for an insect to walk on?

What is the form of the Pythagorean triple generator? A. (x?+y? j * = (?-y? j * - (2xy) " O B. (x2+y? (x2 - y? j * + (2xy) ? O C. (x2 - y2) * (*? + y? y * - (2xy) ? O D. (x2 + y2) % = (+?] + (203)

A rock has 12.5 percent of its original amount of potassium-40 remaining in it; potassium-40 has a half-life of 1.25 billion years. How long ago was the rock formed? A. 1.25 billion years ago B. 2.5 billion years ago C. 3.75 billion years ago D.

Calcium is an element. What is the smallest particle of calcium that has all the chemical properties of calcium?

Which is the best term to use when describing the energy of motion

The pka of hypochlorous acid is 7.530. a 54.0 ml solution of 0.114 m sodium hypochlorite (naocl) is titrated with 0.337 m hcl. calculate the ph of the solution

An atom has no overall charg if it contains equal number of