For which substance does (triangle) Hf = 0

A. H2O (l)

B. C (s, diamond)

C. O3 (g)

D. Br2 (l)

Which of the following would decrease current flow in a circuit made originally from a 1.5 volt battery, a loop of wire and a switch? A. original battery, thicker wire B. original battery, thinner wire C. 3V battery, thicker wire D.

A function of a cell membranes in humans is the

you are given 500 mL of a 5M stock solution of ammonium chloride but for your experiment, you only need 100 mL of a 0.65M solution. Explain how to make the solution you need?

How much energy is required to decompose 612 g of PCl3, according to the reaction below? The molar mass of PCl3 is 137.32 g/mol and may be useful. 4 PCl3 (g) → P4 (s) + 6 Cl2 (g) ΔH°rxn = + 1207 kJ

What sets an atom of one element apart from atoms of all other elements?

What is the correct order of sediment size from smaller particles to bigger particles?

How do the chemical properties of oxides change from left to right across a period? From top to bottom within a particular group?

A mixture is different from a compound because each substance in a mixture a. retains its own properties. c. forms an ion. b. changes its electric charge. d. changes from a solid to a liquid.

Gamma ray Ultra- violet Infrared Radio H. X-rays Visible Microwave Which electromagnetic wave transfers the most energy? infrared microwaves radio waves X-rays Frequency (Hz) 1015 1013 1021 1019 107 10" 109 107 Intro Done

If a 9.983 g sample of calcium sulfate dihyrate was heated in a crucible under the correct conditions, how many grams of water should be lost?