Pure water freezes at a. 0 °c. b. 32 °c. c. 100 °c. d. 273 °c.

What is the electron configuration of the calcium ion?

A chemical solution contains 2% salt. how much salt is in 4 ml of solution?

What does the number next to isotopes signify?

Lead + Nitric Acid discplacment

Which type of radiation is identical in mass and charge to a helium nucleus? a. beta b. alpha c. proton d. positron

Which pair of nitrogen bases will form a bond in a DNA molecule? a. cytosine and adenine b. adenine and thymine c. guanine and thymine d. thymine and cytosine

Most meteors that fall into the earths atmosphere burn up before reaching the ground. Why is this?

Imagine a chemist is in the lab and trying to make some chemical reactions happen. In one reaction she reacts chemicals in an exothermic reaction and there is an increase in entropy.

Which of the following requires an oxidizing agent? Al yields Al3+ 2 O yields O2 Cl2 yields 2 Cl- Ag + yields Ag

Type of ion formed by group 2A elements