How many moles of NaF are produced in the reaction between sodium bromide and calcium fluoride when 550 grams of sodium bromide are used? 2NaBr + CaF2 + 2NaF CaBr2

Which of the following statements is not true? • a. covalent compounds have low melting and boiling points. • ob. covalent bonds between atoms of a compound are relatively weak compared to bonds between molecules. • c. covalent bonds occur between nonmetals. • d. covalent compounds are often gases or liquids.

The blackbody curve for a star name zeta is shown below. what is the peak wavelength for this star ?

When hydrochloric acid reacts with potassium hydroxide solution, the following reaction occurs. hcl (aq) + koh (aq) h2o (l) + kcl (aq) the reaction gives off heat energy, so it is an reaction.