After three half-lives, a sample contains 20 grams of parent isotopes. How many grams of the parent isotope were present to start?

What is the total number of electrons in the valence shell of an atom of aluminum in the ground state? (1) 8 (3) 3 (2) 2 (4) 10

What is the name of the reaction of chlorine and potassium iodide?

A solution containing HCl would likely have

How can the rate of a reaction be increased? Having a lower concentration of reactants Having less surface area decreasing the amount of reactants increasing the temp

How do you find theoretical yield?

Read the following chemical equation. Fe (s) + O2 (g) → Fe3 + O2 - What most likely happens during this reaction? Iron loses three electrons. Iron gains three electrons. Oxygen loses two electrons. Oxygen gains two electrons.

What is a possible charge of an anion? +3 -2 0 +1

What is the oxidizing agent in the reaction fe + agno3 fe (no3) 3 + ag?

If the pituitary gland is inhibited, then what stops

Which mass measurement contains four significant figures? 1. 0.086 g 2. 0.431 g 3. 1003 g 4. 3870 g