Which number represents a basic pH, 4 or 9

When elements with four electrons in the outermost shell react chemically, they A. Always gain 4 electrons B. Always lose 4 electrons C. May lose, gain, or share 4 electrons D. May lose or gain 4 electrons

What is the correct formula of nickel (ii) oxide

What is the molar mass of Sr?

For the A groups (Groups 1A to 8A), what does the group number indicate about an atom?

What is the value for ∆Soreaction for the following reaction, given the standard entropy values? C6H12O6 (s) + 6O2 (g) 6CO2 (g) + 6H2O (l) A+131 J/K B - 131 J/K C + 262 J/K D - 262 J/K E + 417 J/K

How can a neutral atom become a positively-charged particle?

Mineral oil can be used in place of mercury in manometers when small pressure changes are to be measured. What is the pressure of an oxygen sample in mm of mineral oil if its pressure is 28.5 mm Hg? (d of mineral oil = 0.88 g/mL; d of Hg = 13.

To identify an unfamiliar organism, you could use a field guide and an

What is the value of Kw at 25°C? 1.0 x 10-14 1.0 x 10-7 1 7 14

Which statement best describes a bacterial cell? A It contains more than one cell. B It is a complete organism. C It is part of a larger organism. D It contains different kinds of cells