Which grouping identifies chemical properties? a. density, luster, boiling point b. melting point, hardness, conductivity c. malleability, ductility, texture d. combustibility, flammability, reactivity

Explanation:

        Typical examples of physical properties are: mass, volume, density, boiling point, melting point, hardness, specific heat.

        Typical examples of chemical properties are reactivity with oxygen, reactivity with water, and any reactitivy in general.

Hence, applying those definitions to the set of choices you get:

A. Density, luster, boiling point (incorrect)

All of them are physical properties since they are observable and measurable without altering the composition of the sample.

B. Melting point, hardness, conductivity (incorrect)

They all are also physical properties. For example, melting point can be measured with a thermometer during the phase change.

C. Malleability, ductility, texture (incorrect)

Again, all physical properties. Ducitlity, for example, is the ability of the metals to form this wires.

D. Combustibility, flammability, reactivity (correct answer)

       All these properties can only be measured by producing the correspondant chemical reaction (change), so they are chemical properties.

d: the voltage of the secondary coil is less than that of the primary coil.

im not suree sorry if wrong

b. examine and describe cells