Answer: caffeine is a compound.
Explanation:
1) As stated c<span>affeine contains hydrogen, carbon, nitrogen, and oxygen atoms in a fixed ratio.
2) The definition of compound is a pure substance formed by chemical bonding of two or more fifferent elements. That means a defined ratio of the elements in the compound, which conferes uniform and equal properties to every part of the compound.
Some examples of compounds are salt (NaCl), water (H2O), vinegard (CH3 COOH).
A mixture combines several elements or compounds, not bonded by chemical bonds but mixed in ratios which may vary.
</span>
Answer:
heat flow
Explanation:
heat flow moves to a higher temperature to a lower temperature
Answer:
Only the number of neutrons change.
Combustion=heat and light
decomposition=taking something away
single means one element changes
and double means two elements change l.
Answer:
60-20=40km west because the direction Will favour whichever direction is bigger
