What two quantities are conserved in every chemical reaction?

a. moles and mass

c. volume and mass

b. mass and atoms

d. moles and atoms?

What energy transformation happens in a toaster? A. Mechanical - > thermal B. Thermal - > chemical C. Mechanical - > electrical D. Electrical - > thermal What is an example of kinetic energy? A. A ball lodged in a tree B. A car in the garage C.

Which of these elements is a metal? hafnium (Hf) radon (Rn) silicon (Si) sulfur (S) selenium (Se)

Which electron configuration represents the electrons of an atom in an excited state? (1) 2-1 (3) 2-8-7 (2) 2-7-4 (4) 2-4

Which of the following is not a common property or characteristic of an acid? A. Reacts with active metals to produce hydrogen gas B. Slippery feel C. Sour taste D. Reacts with a base to produce a salt

What do sulfuric acid and nitric acid not have in common?

When 0.880 g of an organic compound containing carbon, hydrogen and oxygen is burned completely in oxygen, 1.760 g of co2 and 0.720 g h2 o are produced. what is the empirical formula of the compound?

In ammonium chloride salt (nh4cl) the anion is a single chloride ion, cl. what is the cation of nh4cl

What does copper II sulfate do to the enzyme activity?

In a closed system, if a gas is transported to a container with double the volume of the previous container, gas was held in, What is the gases' new volume?

Rebekah is studying a molecule and trying to determine if it is DNA or RNA. Which kind of molecule is she studying? carbohydrate protein nucleic acid lipid