12. Which type of test helps forensic scientists to narrow down the possibilities of what drug a substance may be? Confirmatory test
Positive test
Presumptive test
Beta test

How does a hydroelectric power plant converts energy into energy.

How many atoms are there in 5.70 mol of mg

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.