Check all the phrases that accurately complete the following sentence:
A Bunsen burner can be ignited
when the gas supply is turned on.
when it is connected to a gas supply.
by holding the striker above the burner and
striking it.
when objects are nearby and can ignite.

when connected to a gas suply

a Bunsen burner can be ignited when gas supply is on

by holding a "striker" over it and striking it.

Explanation:

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.