What is the result of multiplying (2.5 * 1010) * (3.5 * 10-7) ? Use the correct number of significant digits.

Who discovered that a dense positively charged atomic nucleus is at the core of every atom? Ernest Rutherford Erwin Schrödinger Antoine Lavoisier John Dalton

In your own words, describe two patterns on the periodic table. Write at least two sentences, and be as specific as you can.

What is the partial pressure of oxygen that the diver experiences at this depth?

Which statement is true? Rocks do not contain any mineral matter. Most rocks are composed of a single mineral. Most rocks are made up of a mixture of minerals.

Identify the items in the list below that are examples of matter. Check all that apply

How many milliliters of a 0.7% stock solution are required to make 2 l of 0.2% solution? how many ml of solvent will be required to carry out the dilution?

What percentage of the naphthalene molecules emitted a photon?

In an endothermic reaction, heat is absorbed from the surroundings. How does this affect entropy? A. The particles in the surroundings move slower and have decreased entropy. B.

The temperature of a sample of liquid water changes from 50°C to 30°C. Which statement best explains the change that must happen at the molecular level? A. The molecules move more quickly and their average kinetic energy increases. B.

The most important reason why solid sodium hydroxide is not used as a primary standard is