Which of the following is not a state of matter?

a. gas

b. plasma

c. solid

d. round

What is the percent yield for the reaction pcl3 (g) + cl2 (g) ? pcl5 (g) if 119.3 g of pcl5 (? = 208.2 g/mol) are formed when 61.3 g of cl2 (? = 70.91 g/mol) react with excess pcl3? a 66.3%?

Which of the following pairs of elements are likely to form ionic compounds? Check all that apply. Check all that apply. magnesium and chlorine sodium and potassium nitrogen and iodine chlorine and bromine helium and oxygen potassium and sulfur

What is the solution to the problem rounded to the correct number of significant figures? 12.77 + 0.8 = ? A. 14 B. 13.6 C. 13.57 D. 10

Calculate the amount of heat required to raise the temperature of an 84 g sample of water from 36 ∘C to 62 ∘C.

Which substance can not be broken down by a chemical change? (1) methane (3) tungsten (2) propanal (4) water

Which of the following statements about chemical formulas is FALSE? A) The subscripts represent the relative number each type of atom in the compound. B) The subscripts represent the relative mass of each type of atom in the compound.

The lowest possible concentration of free hydrogen ions is represented by a ph value of

Diseases that are inherited are caused by

Why do many metal ions produce acidic solutions when dissolved in water?

Which property of potential energy distinguishes it from kinetic energy? a. mass b. position c. force d. work and power