2. Give two examples of forces you exerted on objects today. What factors were different about

each force you mentioned?

Which of the following represent kinetic energy? A) water behind a dam B) a roller coaster at the top of a hill C) gasoline D.) Riding a bicycle E.) An apple falling from a tree F.) Wind

C. in the reaction of copper and silver nitrate, a new substance appeared in the test tube. describe the physical appearance of the substance and identify its chemical formula

What happens when HCl gas is passed through a saturated PbCl2 solution?

Calculate the enthalpy of the reaction h2 (g) f2 (g) → 2hf (g) using bond enthalpies and compare this value to the result obtained by using the standard enthalpies of formation.

how long was all the matter in the universe theorized to be compressed into a minuscule scalding mass?

A vertical piston-cylinder device contains water and is being heated. During the heating process, 70 kJ of heat is transferred to the water, and heat losses from the side walls amount to 8 kJ.

Which of the following functions occurs in the part of the digestive system indicated by the arrow? Secretion of buffers and digestive enzymesAcid breakdown of swallowed foodsSecretion of bile and buffersAbsorption of water and ions

Sodium metal and water react to create sodium hydrogen and hydrogen gas through the unbalanced equation. Na + H20 - NaOH H2 By determining the limiting reactant, calculate the theoretical yield of hydrogen gas (in grams) if 79.

1) Mg (s) + 2 H + (aq) - --> Mg2 + (aq) + H2 (g)  H°12) Mg2 + (aq) + H2O (l) - --> MgO (s) + 2 H + (aq)  H°23) H2 (g) + 1/2 O2 (g) - --> H2O (l)  H°34) Mg (s) + 1/2 O2 (g) - --> MgO (s)  H°4

A substance has a solubility of 350 ppm. how many grams of the substance are present in 1.0l of a saturated solution