An element that speeds up chemical reactions is called a/an

a. substrate.

b. enzyme.

c. calorie.

d. solvent.

Helium in a 100 L container at a pressure of 65.6 atm and temperature of 250 K is transferred to a container with a volume of 250 L and a temperature of 300 K. What is the new pressure?

When a neutral atom loses an electron what happens to its size

a classmate examines a substance that conducts electricity and is shiny but has no color. He says that is must be silver. What is his error?

An aerosol can of compressed air has the following warning label: "Warning: contents under pressure. Do not expose can to heat or flame. Do not crouch can. "Using what you know about volume, pressure and temperature, explain this warning

To determine the density of corn syrup, a student poured 3.0 mL of the liquid into a 10.0 mL graduated cylinder and massed the cylinder and contents. He determined the density to be 10.5 g/cm3. The accepted value for the density of corn syrup is 1.

Consider a reaction of chemicals depicted as a + b → c + d. suppose reaction of 21.8 grams of a with 40.7 grams of b gave 31.8 grams of c. however, the theoretical yield of c for this reaction was 49.9 grams.

If 0.40 mol of H₂ and 0.15 mol of O₂ were to react as completely as possible to produce H₂O, what mass of reactant would remain?

Based on Reference Table F, which solution will contain the highest concentration of iodide ions? A lead iodide silver iodide mercury (II) iodide iron (11) iodide

What is the volume of 2.25 moles on neon gas at STP? A-0.01L B-50.4L C-0.1L D-60.8L

What type of bonds do inorganic compound make