Atomic number of helium

During the winter months, many locations experience snow and ice storms. It is a common practice to treat roadways and sidewalks with salt, such as NaCl. If a 11.

A water tank has a mass of 3.64 kg when it is empty and a mass of 51.8 kg when it is filled to a certain level. what is the mass of the water in the tank?

Which organisms can digest cellulose?

A solution containing HCl would likely have

What are the characteristics of a substance in the gas phase? made up of particles packed closely together, having both definite shape and definite volume made up of particles packed relatively close together, having an indefinite shape but a

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