A chemical change occurs when

a. Dissolved minerals freeze to form a crystal.

b. Ethanol is purified through distillation.

c. Salt deposits form from evaporated sea water.

d. A leaf changes color from green to red.

Which renewable energy source depends on changing water levels?

If a gas is cooled from 425.0K to 275.15K and the volume is kept constant what final pressure would result if the original pressure was 770.0 mm Hg?

What type of bond forms between two water molecules

A gas occupies a volume of 444 mL at 273 K and 79.0 kPa. What is the final kelvin temperature when the volume of the gas is changed to 1880 mL and the pressure is changed to 38.7 kPa? (1) 31.5 K (3) 566 K (2) 292 K (4) 2360 K

Finish balancing the following equation: _Al (s) + 3Zn (NO3) 2 (aq) → __AI (NO3) 3 (aq) + _Zn (s) What coefficient does Zn (s) have in the balanced equation?

Which indicator would be the best to use for a titration between 0.10 m hcooh with 0.10 m naoh? you will probably need to consult the appropriate table in the book. 1. methyl red, color change at ph 3-5 2.

How are elements group into families

How many moles of lithium are in 83 grams of lithium?

Ocean constitutes most of ___ of water a) Evaporation b) Precipitation c) Condensation d) Transpiration e) Sublimation Don't choose a random letter.

In the reaction, Zn + HCl-> ZnCl2 + H2, 25 grams Zn are reacted with 17.5 grams HCl. How many grams of H2 will be produced? A. 0.382 g of H2 B. 0.479 g of H2 C. 0.7865 g of H2 D. 0.484 g of H2