What is the chemical formula for helium gas?

What is the oxidation state for S in SO4^2-

Is each genus of organisms is divided into classes

Which is true of all covalent compounds? A). They share electrons in bonds. B). They are electrically charged. C). They are good conductors in water. D). They are usually made of a metal and a nonmetal.

Draw the structure of trans-6-bromo-3-heptene. be sure the stereochemistry is drawn clearly.

For a chemical reaction it is usually found that the reaction rate is faster at higher temperature. The rate increases because (a) the concentrations of reactants increase (b) more reactants collide with energy equal to or greater than the

Why does metal need to be extracted from an ore before it can be used?

If heat is released, how does the solution feel?

What is the mass number of an ion with 107 electrons, 157 neutrons, and a 1 charge?

Which of the following is true about compounds

According to the chart, which substance has the lowest OH' concentration? A) urine lemon juice tomato juice D) black coffee