What existed before the universe.

Which of the following pairs of elements is most likely to form an ionic compound? a. nitrogen and sulfurb. sodium and aluminumc. magnesium and fluorined. oxygen and chlorine

What changes do you shown in the model

Explain what it means to say "Nothing in nature happens in isolation".

All formulas of mole concept

Which symbol represents a particle that has the same total number of electrons as S2-? A) O2- B) Si C) Se2- D) Ar

Coefficients in a chemical equation are used to: balance the number of atoms on both sides of the equation ensure that all subscripts on both sides of the equation are the same indicate energy changes that occur during the reaction indicate the type

What determines your blood cholesterol level?

Describe two ways that water moves through earthy atmosphere in the water cycle.

which of the following questions can use science as a method of inquiry? a. is cloning appropriate b. how can we protect crops from drought c. why is jazz a great type of music d. did dinosaurs exist

How many moles of CO will be produced, if 32.5grams of H2O are produced? C6H6S+6O2=>6CO+3H2O+SO3