Two substances each have a temperature of 23 degrees Celcius. After they are combined the temperature rises to 27 degrees Celcius. What evidence proves a chemical reaction occurred?

What is the name of the compound PbS2 • 4H2O?

Calculate the number of CC atoms in 0.183 molmol of CC. Express the number of atoms of carbon numerically.

Select all that apply. A beta particle: -is electromagnetic energy -is an electron -has zero charge -is emitted from the nucleus -has a + 2 charge -has a - 1 charge

What is a polyatmic atom?

What is the percent yield for the reaction pcl3 (g) + cl2 (g) ? pcl5 (g) if 119.3 g of pcl5 (? = 208.2 g/mol) are formed when 61.3 g of cl2 (? = 70.91 g/mol) react with excess pcl3? a 66.3%?

In which substance do the molecules have the strongest attractions to one another? a. sugar, a solid c. sulfuric acid, a liquid b. hydrogen, a gas d. water, a liquid

How to you separate kool-aid that's already dissolved in water? Their should only be 1 step

What is the world's biggest source of power after fossil fuels

Which best describes a stock solution that is used in a dilution?

Why does one Oxygen atom bond with two Hydrogen atoms to form water? Why don't they bond in a different ratio?