A new discovered element, Z, has two natural occurring isotopes

Why is the first ionization of beryllium is greater than boron

Which of the following is true about mixtures and compounds?

What is the first letter of every species

Select all of the following which are examples of physical change. change of composition creation of a new substance change of appearance change in size and shape of a substance change in phase of a substance expansion or contraction of a substance

Five years ago, my grandfather was five times as old as I was. Three years from now, my grandfather will be three times as old as I will be. how old am I now?

How are protons, electrons, and neutrons correctly compared

You compare two layers to a because the crust and upper mantle are solid

A substance that speeds up the rate of a chemical reaction is called a. a catalyst. b. a lipid. c. a molecule. d. an element.

How many moles of Mgs203 are in 245g of the compound

A student was trying to obtain lithium by electrolysis of aqueous lithium chloride. Was he successful?