How does one recognize a periodic trend on the periodic table?

An ___ carries a negative electrcal charge, and is located outside an atoms central core

How many grams of CaF2 are present in 1.25 L of a 0.15 M solution of CaF2? How do I find the grams I am confused on that part?

Consider the following reaction: 4NH3 (g) 7O2 (g) → 4NO2 (g) 6H2O (l) Consider an experiment in which you react ammonia and oxygen. At the end of the experiment, you find that you produced 27.0 g of water, and 8.52 g of ammonia is left over.

Which of the following is a chemical reaction? Check all that apply. Check all that apply. Propane forms a flame and emits heat as it burns. Heat is felt when a warm object is placed in your hand. Acetone feels cold as it evaporates from the skin.

Which solution will have more gas dissolved in it, A solution under high-pressure or one under low pressure?

What happens to iron oxide during decomposition

What is the symbol for the second most common element in the universe? a. H b. C c. Fe d. He?

Which class of organic compound would neutralize a carboxylic acid? O aldehyde amine alkyl halide ether

Calculate the molarity of the solution. 29 g of NaCl (g. f. w. = 58.5 g/mol) in 0.030 liters. 0.015 M 17 M 67 M

How can scientists study the composition of distant stars?