Explanation:
Combustion produces energy. Where does all this energy come from? Energy is stored in the chemical bonds that hold the carbon and hydrogen atoms together. When the atoms are rearranged, the bonds are broken, releasing energy.
Assuming that the experiment started
with the magnesium and did not combine with oxygen, this extra mass would actually
decrease the amount of oxygen. This is because it only artificially increases
the original mass. Therefore this actually increases the error.
Answer:
<span>too low</span>
Answer:
they change the state of matter
Explanation:
Physical properties can be observed or measured without changing the composition of matter
Chemical properties are only observed during a chemical reaction and thus changing the substance's chemical composition
:)
Answer:
Eukaryotic (a plant cell)
Explanation:
The presence of a chloroplast indicates that the cell has membrane-bound organelles. This is not a feature of prokaryotic cells - only eukaryotic cells. Therefore, the cell is eukaryotic. The presence of a large vacuole, chloroplast, and rigid cell wall suggests its a plant cell as plant cells are the only eukaryotes with these features.