When designing an experimental investigation, why is it important to test only one variable?

Given the following equations, calculate the ΔH of the reaction of ethylene gas (C2H4) with fluorine gas to make carbon tetrafluoride (CF4) gas and hydrogen fluoride gas. Show your work.

Which statement best explains why radon and krypton do not bond easily with other elements

Gold has a density of about 20g/mL. If I had a 60g sample, it should have a volume of about ___mL.

Determined that all animals were mad of cells

True or false The actual yield of a product in a chemical reaction should not exceed its theoretical yield.

Karen measures the volume of gas at 200 K and 100 kPa. To correct her measurement to standard temperature and pressure (STP), what must she do? A. make a volume correction based on a higher temperature of 273 K B.

How do the atomic number and the number of protons relate to one another? The atomic number tells us the number of protons The atomic number is protons + neutrons They do not Electron Cloud

Ethanedioic acid, a compound that is present in many vegetables, has a molar mass of 90.04 g/mol and a composition of 26.7% Carbon, 2.2% Hydrogen, and 71.1% oxygen. Calculate the empirical formula and determine the compound formula.

When designing an experimental investigation, why is it important to test only one variable?

A solution with a ph of 11 is first tested with phenolpthalein