What is the oxidation number of tin (Sn) in the compound Na2SnO2? A. - 2 B. 0 C. + 2 D. + 3

1) During the formation of an ionic bond, the atom that transfers its valence electron is the atom with the A) higher electronegativity value B) lower electronegativity value C) lower ionization energy D) higher atomic mass 2) Which type of bonding

Question 1 If the enthalpy of a system increases, what value of ΔH describes the process? ΔH is positive. ΔH is negative. ΔH is zero ΔH increases.

In the reaction, 2h2 o2 - - > 2h2o, how many hydrogen molecules are needed to produce two water molecules? a. 1b. 2c. 3d. 4

Fluorine and Aluminum oxide react to produce Aluminum fluoride and oxygen

What makes a pure substance different from a heterogeneous mixture? A.) The components of a pure substance are mixed unevenly instead of evenly within the pure substance. B.

What is temperature in science, how fast molecules move or how cold or hot something is?

Which describes an object's speed when free falling in a vacuum? The object accelerates until it reaches its terminal velocity. The object falls at a constant speed because only one force acts on it.

If you had 20,000 liters of NO2 how many moles would you have?

What does the name amino acid tell you about the structure of this molecule?

Fluorine is a toxic, reactive gas. which representation (structural formula, electron dot structure, or three-dimensional model) would you use to explain why fluorine is so reactive, why?