Which material is a mixture? a water b methane c air d magnesium

Which explains the change in ionization energy that occurs between removing the first and second electrons from an atom? a. The ionization energy decreases because the ratio of the protons to electrons increases. b.

Calculate the percent of lead in Pb (Co3) 2

at which type of plate boundary do most earthquakes occur? A. convergent B. transform C. divergent D. trench

The reaction represented by the equation: xA + yB - --> productsis started by mixing 1.00 mol of A with 2.00 mol of B in a 1.00 L container at a certain temperature. These concentrations are measured after a certain time.

1.) Rust forms when Fe, O₂, and H₂O react in the balanced equation below; 2Fe (s) + O₂ (g) + 2H₂O (l) - -> 2Fe (OH) ₂ (s) In an experiment 10.0g of Fe is allowed to react with 4.00g of O₂ A.) Which of these reactants is the limiting reagent? B.

In an acid-base titration, of 20 ml of a m HCI solution with 1 m NaOH. How many ml of NaOH are needed

Which of the following is not a source of air pollution related to human activities

Objects and substances in motion is I

If you were to remove an electron from a sodium atom that has eleven protons, what would be the electrical charge of the ion?

The atomic mass of fluorine in 19.0 amu, so the molar mass is?