Answer:
The mass of oxygen will be 19.53g
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:
Answer:
C
Explanation:
If you move the decimal to the left it transforms the expression into scientific notation.
