Answer:The green growing on the penny of copper and the rust forming on the nail of iron are chemical changes. Boiling away salt water, scraping iron filings from a mixture of sand with a magnet, and breaking a rock with a hammer, are physical changes.
Explanation:
The most abundant of all of the isotopes of an element will be the one who's mass the mass of element is closest to. In this case, the mass of atomic carbon is closest to the mass of carbon-12.
Thus, Carbon-12 is the most abundant isotope.
Answer:
Respiritation
Explanation:
Its Respiration because the process of breathing is known as respiration and also read the paragraph hhhhhhhhhhhhhhhhhhhhhhhh
Answer:(16)(2000)m/s=32000m/s
Explanation: A diatomic oxygen has a molar mass of 16
