Heelp

Balance the chemical reactions:

Na2O + H2O - - - > 2NaOH

K2O + H2O - - - > KOH

MgO + H2O - - - > Mg (OH) 2

CaO + H2O - - - > Ca (OH) 2

SO2 + H2O ⇄ H2SO3

SO3 + H2O - - - > H2SO4

Which pair of atoms has the most polar bond? (1) H-Br (2) H-Cl (3) I-Br (4) I-Cl

If you're standing on the beach looking out at the ocean as far as you can see, where's your zenith? a) on the local horizon B) straight over your head C) above the local horizon D) behind you as far as you can see

Propane camping stoves produce heat by the combustion of gaseous propane (C3H8). Balance the skeletal equation for the combustion of propane. C3H8 (g) + O2 (g) →CO2 (g) + H2O (g)

What is the molar mass for chlorine gas

The polarity of the water molecule aids in dissolving compounds. This is demonstrated by all but which statement?

Which change is most likely to occur when a molecule of H2 and a molecule of I2 collide with proper orientation and sufficient energy? 1. a chemical change, because a compound is formed 2. a chemical change, because an element is formed 3.

Which substance is a diatomic molecule? a. he b. o2 c. co2 d. h2o?

What is the difference between the electronegativity values of sodium and bromine?

Which of the following elements is the most stable element? argon, manganese, phosphorus, robidium

List results of Chemical Reactions.