Which of these is not an indicator of a chemical reaction. question 7 options: change in color production of heat, cold or light precipitation of a solid change of state

Which compound contains both ionic and covalent bonds? a) hbr b)cbr4 c)nabr d) naoh

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

Click the button that shows the correct relationship of the electron affinities of the elements sodium and phosphorus. sodium’s electron affinity value is more negative than the electron affinity value of phosphorus. phosphorus’ electron affinity value is more negative than the electron affinity value of sodium. this information cannot be determined using the periodic table. answer is b on e2020.