In an endothermic reaction, is heat absorbed or is heat given off?

A high diffusion rate is characteristic of what state of matter?

Determine the oxidation number of the underlined element in the following compound. Be sure to indicate if the oxidation number is positive or negative. NaNO3

Look at the heating/cooling curve for water diagrammed below. Between which two letters is the phase changing of condensation taking place? Response should be in the form “x and y”. 

When a nonmetal forms an ion, will the charge on the ion be positive or negative?

In an endothermic reaction, is heat absorbed or is heat given off?

Balance the equation below by placing the correct coefficients in the blanks. Your response should list the coefficients in order from left to right, separated only by commas; no spaces. If no coefficient belongs in a blank, represent it with a “1”. For example the equation 2 H2O  → 2 H2+O2 would be represented as 2,2,1.  ____H3(PO4)  +  ____ Rb(OH)   →   ____H2O + ____Rb3 (PO4)   

Balance the equation below by placing the correct coefficients in the blanks. Your response should list the coefficients in order from left to right, separated only by commas; no spaces. If no coefficient belongs in a blank, represent it with a “1”. For example the equation 2 H2O →  2 H2+O2 would be represented as 2,2,1. ____Cr + ____H2(SO4)  →  ____H2  +   ____Cr2(SO4)3  

Which of the following pairs of elements would you expect to form an ionic bond?

Which of the following statements best describes an ionic bond?