Many elements that are essential for life, including nitrogen, oxygen, and carbon, are part of what classification?

A. Metalloids

B. metals

C. noble gases

D. nonmetals

Why is the solubility of KHP in water greater than many fatty acids with six or more carbons?

Calculate how many kilograms are in 4 moles of Na2CO3?

When zinc pieces are are put in copper sulphate solution what happens?

How does entropy change with pressure?

Someone anyone give me tips to finish online homework because i have 30 assignments to do

Sulfur (S) has 16 protons and 16 neutrons. How many electron shells does an element of sulfur have?

Which one of the following statements about orbital energies is incorrect? A) The energy of a given orbital increases as the nuclear charge Z increases. B) In many-electron atoms the energy of an orbital depends on both n and l.

When solid lead (II) sulfide ore burns in oxygen gas, the products are solid lead (II) oxide and sulfur dioxide gas.? A. write the balanced equation B. how many grams of oxygen are required to react with 29.9 grams of lead II sulfide? C.

What are some differences between insect larvae and worms?

Suppose that 100 grams of water at 50.0°C is placed in contact with 200 grams of iron at 30.0°C. The final temperature is 46.5°C. The specific heats of water and iron respectively, are 4.18 and 0.45 joules per gram times Celsius.