What is the definition of half-life?

A block of ice with a total mass of of 25 grams is beginning to melt. How will this physical change affect the mass of the block ice.

Which of the following should you always wear to avoid being thrown from a vehicle and then crushed if it tips over?

How do you solve a combustion reaction

A molecular biologist measures the mass of cofactor a in an average yeast cell. the mass is 41.5 pg. what is the total mass in micrograms of cofactor a in a yeast colony containing 105 cells? write your answer as a decimal.

C12H22O11 (s) + H2SO4 (aq) + 1/2 O2 (g) → _C (s) + CO2 (g) + 12H2O (g) + SO2 (g) What law is demonstrated by this chemical reaction shown by the equation above, when this equation is balanced?

For most compounds with a single keto group in the molecule, equilibrium favors the keto form over the enol form of the compound. this is due largely to what?

The partial negative charge in a molecule of water occurs because the electrons shared between the oxygen and hydrogen stoms spend more time around the oxygen atom nucleus than around the hydrogen atom nucleus?

An electron moved from a higher energy level to a lower energy level. What most likely happened during the transition?

As the average kinetic energy of the particles in a gas increases, which of the following occurs? The temperature of the gas increases. The temperature of the gas decreases. The number of particles increases. The number of particles decreases.

What is the type of strong chemical bond between carbon, hydrogen, and oxygen atoms in a single organic molecule?