1. The elements most likely to form more than one type of ion are the

a. transition metals

b. alkali metals

c. halogens

d. alkaline earth metals

What laboratory activities involve chemical changes

According to some scientists, which is a cause of global warming? decrease of nitrous oxide changes in cloud cover decrease of methane gas changes in solar energy

Calculate the molality of a 27.0% (by mass) aqueous solution of nitric acid.

Which item has more thermal energy? Question 6 options: a.) 500 ml of water at 50 degrees Celsius b.) 100 ml of water at 50 degrees Celsius c.) They both have the same thermal energy

A student titrates an unknown amount of potassium hydrogen phthalate (khc8h4o4, abbreviated khp) with 20.46 ml of 0.1000 m naoh solution. khp has one acidic hydrogen. what mass (in grams) of khp was titrated by the sodium hydroxide solution?

Which are the hybrid orbitals of the carbon atoms in the following molecules? (a) H3C-CH3 sp sp2 sp3 (b) H3C-CH═CH2 sp sp2 sp3 (c) CH3-C≡C-CH2OH sp sp2 sp3 (d) CH3CH═O sp sp2 sp3

Which of the following pollutants is NOT created by fossil fuels? a. sulfur dioxide c. nitrogen dioxide b. phosphodioxide d. carbon dioxide

What causes velocity to change?

A radioactive sample is 555 years old. It's half life is 111 years. How many half lives?

An ion of magnesium has 12 protons and a charge of + 2. how many electrons are in this ion? A. 2 B. 20 C. 12 D. 14