Why must scientists use standard units of measure in their experiments

A solution is prepared by dissolving 150 mL of ethanol in enough water to make a 500 mL solution. What is the percent by volume of ethanol in the solution? 10% 30% 70%

In viewing a chemical equation, how do you determine the ratios that relate reactants and products?

Which reactant will be in excess, and how many moles of it will be left over?

How can evaporation be used to find out how much salt is in a solution?

Change 23 degrees Celsius to F

A neutral atom has an atomic number of 20 and a mass number of 41; how many protons, neutrons, and electrons are found within the atom?

Which of the following are dwarf planets Ceres Nama is Eris Charon Haumea Makemake Pluto

Which set of factors changes igneous or sedimentary rock into metamorphic rock? heat and weathering water and weathering heat and pressure water and pressure

What is the standard cell potential (E°cell) for the voltaic cell based on the reaction below? Sn2 + (aq) + 2Fe3 + (aq) → 2Fe2 + (aq) + Sn4 + (aq)

G oil of wintergreen, c8h8o3 is prepared when methanol, ch3oh, is reacted with salicylic acid, c7h6o3. what is the percent yield of a reaction in which 15.3 g of oil of wintergreen is collected after 16.