What best explains why the box's final kinetic energy is less than its initial potential energy

Which of the following could result from a substance that undergoes a physical change? a) Its chemical composition is altered. b) It has an irreversible change. c) It forms a new substance. d) Its shape is altered.

What is the total number of electron pairs shared between the two atoms in an O2 molecule? (1) 1 (3) 6 (2) 2 (4) 4

A mylar balloon is filled with helium gas to a pressure of 107 kPa when the temperature is 22°C. If the temperature changes to 45°C, what will be the pressure of the helium in the balloon?

Write the acid-base reaction that occurs when an aqueous solution of HCl is added to an aqueous solution of NaOH. (Use the lowest possible coefficients. Omit states-of-matter in your answer.

Compared with the electronegativities of the elements on the left end of a particular period, the electronegativities of the elements on the right side of that same period tend to be A. lower. B. higher. C. the same. D. unpredictable.

How is steel made from iron?

8. True or false: Half-life is half the time it takes for a radioactive sample to completely decay.

Given the equation representing a reaction: sn4 + (aq) + 2e - → sn2 + (aq) which term best describes this reaction?

Calculate the root means square velocity of nitrogen molecules in 25 degrees Celsius

How many bonds are present in Cl20? a. 2 b. 4 c. 1 d. 3