We use the periodic table to determine a mineral's hardness true or false

Who was John Dalton? A. A schoolteacher who published ideas about the atom B. The scientist who discovered the electron C. The physicist who came up with the oil-drop experiment D. A physicist who studied the nucleus of the atom

Group the following electronic configurations of neutral elements in sets according to those you would expect to show similar chemical properties. a. 1s^22s^22p^63s^23p^3 b. 1s^22s^22p^63s^23p^63d^104s^24p^5 c. 1s^22s^22p^63s^23p^6 d. 1s^22s^22p^3

Which is an example of the strong force in action? A battery-powered radio produces sound. A magnet keeps a cabinet door closed. The Sun pulls on Earth as Earth moves around the Sun. The protons in the nucleus of a carbon atom are held together.

In determining the  Hreaction for formation of MgO, why didn't we directly burn the Mg metal in air and measure the heat produced?

Which ocean zone has the most sunlight?

A solution of orange juice that weighs 500 g contains liquid juice and solid pulp. All of the pulp is removed from the juice. The pulp is found to weigh 50 g. How much would the remaining liquid juice weigh? A. 50 g B. 250 g C. 450 g D. 500 g

Assume 3 molecules of Fe react according to the following equation. 3Fe + 4H2O Fe3O4 + 4H2 How many molecules of H2 are produced? How many water molecules are required? What is the mole ratio of Fe to H2O?

10.0 mL of a HF solution was titrated with a 0.120 N solution of KOH; 29.6 mL of KOH were required to completely neutralize the HF. Calculate the normality of the HF solution.

The number of grams present in 1.35 mol of Fe is

Which can associate a suspect's gun with a crime?