Which is a chemical change?

O A. water boiling

O B. wood burning

OC. glass breaking

OD. ice melting

E. molding iron

Which energy change best relates to a boulder that is rolling down the side of a hill? potential energy transforming into kinetic energy mechanical energy transforming into thermal energy potential energy transforming into electromagnetic energy

Is mixing sodium chloride and silver nitrate a chemical or physical change?

When 2.246 grams of a calcium chloride hydrate was heated, 0.728 grams of water were released. Determine the formula of the hydrate (Hint: take the same approach as for the copper (II) sulfate hydrate).

Which organism is an herbivore? A. grass B. bacterium C. spider D. grasshopper

Who many weeks in a year?

Car Q and z are put though an endurance test to see if they can travel at 120 km/h for 5.0 hours. Each car has a 45-L fuel tank. Car z must stop to refuel after traveling for 4.2 hours. Car Q, however, travels for 5.4 hours before running out of gas.

What happened to the atoms in the heated metal ball so that it didn't fit through the ring?

A 3.00 L flexible container holds a sample of hydrogen gas at 153 kPa. If the pressure increases to 203 kPa and the temperature remains constant, what will the volume be?

Measurement of the functions of a nephron reveals a glomerular capillary pressure of 69 mm Hg, and a pressure in the capsular space of 15 mm Hg.

Water is unique because the density of it's solid is less than the density of it's liquid. Describe how life would be different if this weren't true