In chemical reactions that occur in nature, are atoms and mass conserved

What role does the rock play

Why do transition metals often have more than one possible ion, and why we distinguish these ions in the form of roman numerals in brackets?

Units accepted according to the international system are called?

Write a balanced chemical equation for each of the following reactions: a. Phenol + sodium hydroxide b. Product of part (a) + ethyl bromide c. Product of part (a) + butyl p-toluenesulfonate d. Product of part (a) + acetic anhydride e.

it is 240km from monroe to boston. How much will it cost to drive from monroe to boston if the price of gas is $3.75 gallon and your car gets 27 miles to the gallon

You are conducting an experiment on plant growth. You take a plant fresh from the soil that weighs 5 kilograms (kg). Then you dry the plant overnight and determine the dry weight to be 1 kg.

What is the ratio of Fe+3 ions to O2 - ions in a neutral compound? a. 1:2 b. 2:1 c. 2:3 d. 3:2

What is the specific heat capacity of a 17.5g sample of an unknown metal that releases 6700J of heat when it cools from 90 to 25 degrees C?

How can equilibrium of a closed system chemical reaction be disturbed? Select all that apply. Adding or removing products or reactants. Keeping the concentration of products and reactants the same. Keeping the temperature of the system constant.

Why does an exothermic reaction need activation energy?