The answer is a sound wave.
Answer:
Explanation:
When something is burned, it means that it is <u>reacted with oxygen</u>. Steel wool is made out of iron, which bonds with oxygen atoms to form iron oxide which is solid in this reaction. Since, there are now more solid atoms in the steel wool, it will weigh more than before it was burned.
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Answer:
the answer to your question above is D
Answer:
The uncertainty due to the equipment on chemistry equipment is equal to +-1/2 of the smallest unit marked in your equipment; in this case you have a pipette and its sameelst mark is 0.1 mL, so the uncertainty will be 0.05 mL. If you divide 0.05 mL / 3.2 mL and multiply it by 100 you get 1.56% of uncertainty if you measure 3.2 mL, so it will be proper to report the measurement and also the uncertainty.
it states that the atom is neutral, meaning the number of electrons and protons are the same. so if there are 13 electrons, there are 13 protons. And the mass number is neutrons plus protons. So 13+15 is 28