7. You dissolve 15 g of NaCl in 400 mL of water, then mix 100 mL of 1.0 MNaCl in with the

solution you made. What is the resulting concentration?

Two substances, A and Z, are to be identified. Substance A can not be broken down by a chemical change. Substance Z can be broken down by a chemical change. What can be concluded about these substances? (1) Both substances are elements.

Name the complex ion [cu (cn) 6]4-. the oxidation number of copper is + 2. enter the name.

2. Where are valence electrons located?

Which state of matter has an indefinite volume and takes the shape of its container? Liquid Gas Both liquid and gas

What is the gasoline doing to our environment?

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