What do the presence of fish and a wide diversity of invertebrates in a river indicate regarding water quality?

A chemistry student needs 50.0 g of dimethyl sulfoxide for an experiment. By consulting the CRC handbook of chemistry and physics, the student discovers that the density of dimethyl sulfoxide is 1.10 g*10^-3.

Assume that the density and heat of combustion of E85 can be obtained by using 85 % of the values for ethanol and 15 % of the values for gasoline. How much energy could be released by the combustion of 3.5 L of E85?

If the reaction uses 140 grams of iron, how much rust could be produced?

What is the outcome of all chemical changes when two substances are combined?

Complete the following sentence: "During a chemical reaction." Select one: O the number of atoms in the product (s) is less than those of the reactant (s). O the mass of the atoms of the product (s) is greater than those of the reactants).

How many moles of methane are produced when 25.1 moles of carbon dioxide gas react with excess hydrogen gas?

Which reaction releases the greatest amount of energy per kilogram of reactants? A) neutron + uranium-235 ➡️ barium-141 + krypton-92 + 3 neutrons B) 2C + H2 ➡️ C2H2 C) C3H8 (g) + 5O2 (g) ➡️ 3CO2 (g) + 4H2O (l) D) NaOH (aq) + HCl (aq) ➡️ NaCl (aq) +

Name the hardest artificial substance known?

Suzzane has type A - blood. Which thpe of blood could she receive in a blood transfusion?

What can I draw or write about that's related to science?