Use the information about igneous rocks a–d to classify each one as intrusive or extrusive and basaltic or granitic. fill in the chart with a, b, c, or d. rock a—dark-colored large grains rock b—large crystals, high percentage of silica rock c—fine-grained texture, light-colored rock d—from hawaiian volcano area, no visible crystals

I know this is an old question - but the other answer here is NOT correct. If anyone comes across this and is doing this practice again, the CORRECT answer is:

Rock A - Basaltic, Intrusive.

Rock B - Granitic, Intrusive.

Rock C - Granitic, Extrusive.

Rock D - Basaltic, Extrusive.

Rock A - Basaltic, Intrusive.

Rock B - Granitic, Intrusive.

Rock C - Granitic, Extrusive.

Rock D - Basaltic, Extrusive.

Explanation:

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.