Which of these is an element, oxygen, sodium chloride, water, or air

In the mechanism for cyanohydrin formation, why is HCN the acid that protonates the alkoxide ion, instead of HCl?

The element bromine is a reddish-brown liquid at room temperature, with a density of 3.103g/mL. What is the mass, in grams, of 19.8 ML of bro mine? Use the formula D=M/V (where D equals density, M am equals mass, V equals volume).

How to tell how reactive an element is on the periodic table?

How many sublevels are contained in each of the principal energy levels?

A double replacement reaction is a reaction in which one element replaces a similar element within a compound True or false

Which of these is produced when fossil fuels are burned? A) oxygen Eliminate B) nitrogen C) hydrogen D) carbon dioxide

Predict the sign of ΔSsys for each of the following processes. Which are positive? (a) Gasoline vapors mix with air in a car engine. (b) Hot air expands. (c) Humidity condenses in cold air.

A system consists of two components, each of which must activate if the system is to activate. One component has a reliability of. 99. The other has a reliability of. 95. The components are independent of one another with respect to reliability.

Which of the following energy level changes for an electron is most energetic? 3 → 2 5 → 2 4 → 2

Is baking soda a element compound homogeneous mixture or heterogeneous mixture?