A helium atom has - - - protons & - - - neutrons?

Which element is needed for a. Bone and teeth formation. b. Treatment of water.

If a pH of water is 5.3 then 4.3 is it 1.0 less acidic 1.0 less basic

If the atmosphere is like a green house, what parts of it function as the glass

Which equivalent factor should you use to convert from 4.28 * 10^19 molecules of oxygen to moles of O2

Who is known as the "father of modern chemistry" because he first organized all known elements into four different groups? Johann Wolfgang Döbereiner Antoine Lavoisier Dmitri Mendeleev Henry Moseley

Which is measured using a calorimeter

5) Solid lithium metal is added to an aqueous solution of magnesium chloride forming lithium chloride solution and solid magnesium a. If you begin the reaction with 15.0 g of lithium and 25.

Which element easily loses one electron to form a positive ion? A. Magnesium (Mg) B. Lithium (Li) C. Nitrogen (N) D. Fluorine (F)

What is an indication a chemical reaction has occurred? A.) Formation of gas B.) Boiling of a substance C.) Melting of a substance D.) Freezing of a substance

A saline solution contains 1.6 % NaCl by mass. How much NaCl is present in 57.2 g of this solution?