Why is helium in group 18 on the periodic table though it only has 2 valence electrons?

What causes a solid solute to dissolve faster?

Which of the following describes an exothermic reaction? Thermal energy is absorbed by the system. Thermal energy is absorbed by the surroundings. Thermal energy is not transferred. The initial and final temperatures of the system remains the same.

93 mL of water has a given mass of 93 g. which object was more accurate in determining volume, the graduated cylinder or the beaker? why?

Which of the following is least to produce potentially harmful products or byproducts? A. Radioactive decay B. Nuclear fusion C. Uncontrolled nuclear fission D. controlled nuclear fission

Question 1 how many moles of helium are found in a balloon that contains 5.5 l of helium at a pressure of 1.15 atm and a temperature of 22.0 ºc?

Uses of iron oxide in nanotechnology (biomedicine)

Organic chemistry is the study of compounds containing A. carbon. B. nitrogen. C. hydrogen. D. oxygen.

Explain why fermentation would occur in your muscle cells as opposed to cellular respiration.

How do intra-specific and inter-specific relationships within a community maintain biodiversity by preventing competitive exclusion?

Which of the following processes is endothermic? A. a hot cup of soup (system) cools on a countertop B. the combustion of butaneC. the chemical reaction in a "hot pack" often used to treat sore musclesD. the vaporization of rubbing alcohol E.