During her science fair project, mary discovered that solutions of ionic compounds in water conduct electricity. what type of investigation could mary perform to discover which type of ions conduct electricity best?

Mary could do two types of experiments

Type 1. She could hold the cation constant and vary the anion.

She could try solutions of NaCl, NaBr, NaI, Na₂SO₄, Na₃PO₄, etc.

These experiments would tell her which anions are the best conductors.

Type 2. She could hold the anion constant and vary the cation.

She could try solutions of NaNO₃, KNO₃, Mg(NO₃)₂, Ca(NO₃)₂, Al(NO₃)₃, etc.

These experiments would tell her which cations are the best conductors.

answer: option (4) is the correct answer.

explanation:

areas which are at low altitudes and near the equator tend to receive direct sunlight from the sun. hence, heat energy or radiations from the sun make these areas warmer and they have warmest water.

whereas areas which are at high altitudes and away from the equator do no receive direct sunlight. hence, no direct contact from the sun makes these regions colder and thus, they have colder water.

thus, we can conclude that the statement areas at low latitudes near the equator have the warmest water because they receive the most direct sunlight best explains the relationship between an area's geography and the temperature of its surface water.

the dependant variable is spilled water

the independent is the heat