In what type of change is matter conserved? select one:

a. physical only

b. chemical only

c. physical and chemical

In a solution of salt and water if the concentration of salt molecule is greater outside a cell than inside then water molecules will

What was the plum-pudding atomic model? A. A description of atoms being balls of positive charge with electrons scattered outside B. A description of electrons orbiting the nucleus of the atom C.

If HA, an acid, is 15 percent dissociated in a 2.00 molar solution, what is the Ka for the solution? A. 5.3 * 10-2 B. 6.4 * 10-3 C. 1.1 * 10-2 D. 1.2 * 10-2

What's the formula for carbon monoxide

What was first responsible for changing the formerly poisonous atmosphere to an oxygen-rich atmosphere as we have today? Meteor impacts Volcanic gases Earthquakes Photosynethic bacteria (Cyanobacteria)

Identify the spectator ions in the following complete ionic equation. 2k (aq) s2 - (aq) pb2 (aq) 2no-3 (aq) →pbs (s) 2k (aq) 2no-3 (aq) express your answers as ions separated by a comma.

4. A bird left its post and flew in a triangular path. It flew 21 yards south, 72 yards east and 75 yards diagonally to end back at the post. Is it a right triangle?

Condension occurs in the inside of your windows in Winters, why?

How can you use Hess's law to determine a reaction's enthalpy?

7. How much energy in KJ is released when 15.0 g of steam at 100.0 degrees Celsius is condensed and then frozen to ice at 0.0 degrees Celsius?