Which is the oldest?

A.

Precambrian

B.

Mesozoic

C.

Paleozoic

D.

Cenozoic

Extracting oil from shale deposits a has been initiated on a large scale in the United States and will soon surpass Canada's production. b involves removing and refining waxy hydrocarbons called kerogen.

What is the answer to it

A marshmallow gets black when toasted too long in a campfire. chemical property or change

A tumor is injected with 0.8 grams of iodine-125, which has a decay rate of 1.15% per day. to the nearest day, how long will it take for half of the iodine-125 to decay?

Gold is alloyed (mixed) with other metals to increase its hardness in making jewelry. A) Consider a piece of gold jewelry that weighs 9.40 g and has a volume of 0.675 cm3. The jewelry contains only gold and silver, which have densities of 19.

Determine the number of moles of sulfur trioxide produced when 3.5 moles of oxygen gas is consumed in the reaction

For each of the following balanced oxidation-reduction reactions, (i) identify the oxidation numbers for all the elements in the reactants and products and (ii) state the total number of electrons transferred in each reaction. 1.

Hypervitaminosis is a serious health threat associated with excessive amounts of ingested fat-soluble vitamins. why do water-soluble vitamins not commonly pose the same threat?

Hydrogen is an element with two naturally occurring isotopes: 2 H and 3 H. This means that 2 H, which has a mass number of 2, has fewer than 3 H, which has a mass number of 3. True/False

C₂H₂ + O2 - CO₂ + H₂ How many moles of oxygen are necessary to react completely with 4.0 moles of propane (CH) ?