Which of the following situations violates the law of conservation of energy? A ball dropped from the top of a building increases in speed until it hits the ground
A block sliding freely on level ice increases in speed until it hits a wall.
A child playing on a swing moves fastest at the bottom of the swing's path.
The height a ball bounces decreases with each bounce

This classification of drug typically changes the brain's chemistry and reduces its ability to create its own endorphins.

Astable electron arrangement for an atom is one that does not easily change. how is this arrangement arrived at? a. valence electrons are transferred or shared to create a full outer shell of electrons. b. valence electrons are discarded into space to create a full outer shell of electrons. c. protons (positive charge) pair with valence electrons (negative charge) to create a strong bond. d. outer shells with valence electrons are transferred or shared.

Reacting masses1 calcium carbonate breaks down on heating to produce calcium oxide and carbondioxide gas.caco3 + cao + co2a student heats 15 g of calcium carbonate strongly in a crucible.relative atomic masses (a): ca = 40, c = 12, o = 16.calculate the mass of calcium oxide produced by this reaction.(5 marks)