How is the number 3.91 x 10 - 4 expressed in regular numbers?

A. 0.3910000

B. 0.0000391

C. 0.0391

D. 0.000391

Explain how most fish reproduce similarly?

Hydrogen gas reacts rapidly with oxygen gas in the presence of a platinum catalyst. Which equation correctly represents this reaction?

Consider the following three-step mechanism for a reaction: Cl2 (g) ⇌2Cl (g) Fast Cl (g) + CHCl3 (g) →HCl (g) + CCl3 (g) Slow Cl (g) + CCl3 (g) →CCl4 (g) Fast What is the overall reaction?

Which of the following polyatomic ions will form an ionic compound with a single sodium ion? CO32- HCO31- SO42- SO32-

Which element do you expect to be most like magnesium? Why? a.) potassium b.) silver c.) bromine d.) calcium e.) lead

A cylinder has a height of 5.3 cm and a diameter of 3.0 cm. What is its volume?

Define density and erute the formula and units for calculating density

A student intended to make a salt solution with a concentration of 10.0 grams of solute per liter of solution. When the student's solution was analyzed, it was found to contain 8.90 grams of solute per liter of solution.

What value is the closest to the atomic mass of cerium? Isotope Percent Abundance 136Ce 0.185% 138Ce 0.251% 140Ce 88.450% 142Ce 11.114%

Which element could chlorine bond with to form an ionic compound? helium oxygen fluorine sodium