Which one of the following polymer is prepared by condensation polymerization?

(A) Dacron (B) Teflon

(C) Styrene (D) Rubber

Which of Earth's topographical features can affect weather patterns?* A. oceans B. lakes C. mountains D. all of these

Hydrogen gas and bromine gas react to form hydrogen bromide gas. How much heat (kJ) is released when 155 grams of HBr is formed in this reaction? ΔH° = - 72 kJ.

What the product and readucts of 2NaB+C12=2NaCI+Br2

Define density and erute the formula and units for calculating density

The charge per unit length on a glass rod is 0.00500 C/m. If the rod is 1 mm long, how many electrons have been removed from the glass rod?

What element has 8 valence electrons

Which of the following best describes a metal? Brittle, shiny, and solid Brittle, dull, and low density Malleable, shiny, and able to conduct heat or electricity Malleable, dull, and solid, liquid, or gas at room temperature?

Which of the following errors could cause your percent yield to be falsely high, or even over 100%? Select ALL that apply. A.) Heating the sample too vigorously. B.) Handling the crucible directly with your hands. C.

If 56.8 ml of bacl2 solution is needed to precipitate all the sulfate ion in a 554 mg sample of na2so4 (forming baso4), what is the molarity of the solution?

is the number of total atoms on the left side of a balanced equation always equal to the number of total atoms on the right side of the equation?