The element oxygen, represented by the symbol O, is classified as

A. a compound.

B. a mixture.

c. a pure substance.

D.

a solution.

True or false climatologist use weather balloon stethoscope and satellite

The noble gases are grouped together in the periodic table. where are the noble gases in the table? a. the top row b. the bottom row c. the far left column d. the far right column user: where on the periodic table are the metals found? a.

The individual dipole moments in ammonia (NH3) do not cancel each other out. What is the strongest force that exists between molecules of ammonia?

An aqueous solution of iron (II) sulfate (FeSO4) is prepared by dissolving 2.00 g in sufficient deionized water to form a 200.00 mL solution. Calculate the molarity of the solution.

How many water molecules (H2O) can be produced from 6 molecules of hydrogen gas (purple) reacting with 6 molecules of oxygen gas (turquoise) ? Which reactant is the limiting reactant? Oxygen and hydrogen molecules A.

Which of the following transitions would release energy? n=2->n=3 n=1 - > n=3 n=3 - >n=1 n=3->n=2

Which animal group actually saw a drop in the number of endangered and threatened species between 1995 and 2005? a Fish b. Reptiles c. Birds d. Mammals

Why does burning fossil fuels put ecosystems under pressure?

What is the quantum number set of the ground-state electron that is found in helium (He) but not in hydrogen (H) ? (1, 0, 0, - ½) (1, 0, 1, - ½) (1, 1, 0, - ½) (1, 1, 1, - ½)

What must be true in order for magnetism to induce an electric current in a wire? There needs to be a switch in the circuit. There cannot be a switch in the circuit. The wire must be part of a closed circuit. The wire must be part of an open circuit.