Why did oceans not exist on Earth nearly 4 billion years ago?

a. No water molecules were present.

b. Water remained a gas because Earth was very hot.

c. Water existed as ice because Earth was very cold.

d. There was no oxygen gas in the atmosphere.

Which type of bonding involves the complete transfer of a valence electron from a less electronegative atom to a more electronegative one?

Why do nonmetals tend to gain electrons to from negative ions?

Which statement correspond to a cellular respiration

How many moles are present in 2.45E23 moles of carbon tetrahydride

Which substance can not be broken down by a chemical reaction? (1) ammonia (3) methane (2) argon (4) water

What two chemical mechanisms change pyruvate to acetyl-CoA in the pyruvate dehydrogenase complex? Group of answer choices a) Decarboxylation and condensation. b) Oxidation and decarboxylation. c) Condensation and dehydrogenation.

Which earth cycle does the suns energy drive

How many moles are in 10 grams of CaCl2?

Which is the correct formula for phosphorus pentachloride? PCl4 because a subscript of 4 indicates four Cl atoms PCl5 because a subscript of 5 indicates five Cl atoms P5Cl because a subscript of 5 indicates five P atoms P5Cl3 because a subscript of

Why are the elements in groups 3 to 12 often used to make dyes?