A group of students collected the following data to determine whether compounds were ionic or covalent in nature. They placed each compound in a small bowl and stuck two open ends of a battery powered circuit in the compound. If the light bulb lit up they marked the substance as electrically conductive, and if the bulb did not light up they marked it as not electrically conductive. Compound:

HCl KCl CaO SiO2

Conductive?

No No No No

Based on the student’s data, can they determine which substances are ionic and which are covalent?

A.
Yes, because all of these compounds are ionic since they are not conductive.

B.
Yes, because all of these compounds are covalent since they are not conductive.

C.
No, because ionic compounds are only conductive in an aqueous solution.

D.
No, because covalent compounds are only conductive in an aqueous solution.

Porque crees que el agua no podia subir mas de 10 m de altura con ese tipo de bomba

Apossible explanation for a set of facts that can be tested by further investigation is called

Search coils and credit cards. one practical way to measure magnetic field strength uses a small, closely wound coil called a search coil. the coil is initially held with its plane perpendicular to a magnetic field. the coil is then either quickly rotated a quarter-turn about a diameter or quickly pulled out of the field. (a) derive the equation relating the total charge q that flows through a search coil to the magnetic-field magnitude b. the search coil has n turns, each with area a, and the flux through the coil is decreased from its initial maximum value to zero in a time ∆t. the resistance of the coil is r, and the total charge is q = i∆t, where i is the average current induced by the change in flux. (b) in a credit card reader, the magnetic strip on the back of a credit card is rapidly “swiped” past a coil within the reader. explain, using the same ideas that underlie the operation of a search coil, how the reader can decode the information stored in the pattern of magnetization on the strip. (c) is it necessary that the credit card be “swiped” through the reader at exactly the right speed? why or why not?