A) Combustion
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Answer:
Explanation:
Repeated tests help determine whether the hypothesis is always true in different circumstances. Repeatedly testing a hypothesis qualifies it to be accepted as a theory.
An isotope is different from an element by the number of neutrons it has.
Answer:
its atomic number is 92 and its atomic mass is 238(92+146).
Explanation:
For example,Silicon has 14 protons and 14 neutrons.its atomic number is 14 and its atomic mass is 28
Answer:
the source of energy for food is sunlight energy and the inside the cells of plants, algae, and photosynthetic bacteria, chlorophyll, and enzymes use the light energy to rearrange the atoms of the reactants to form the products. molecules of the glucose and oxygen gas
