Answer: Because it is a giant fire ball
To calculate the average atomic mass, multiply the fraction by the mass number for each isotope, then add them together.
Answer:
Explanation:
Earth is considered a closed system because only energy, not matter, is exchanged. A closed system like Earth can be easily represented by a sealed jar. When the lid is sealed, matter like air or water can neither enter nor exit the jar. If you placed that same jar in a 100-degree oven, the air inside the jar would eventually increase in temperature to 100 degrees, representing an exchange of energy known as heat.
Answer:
b and c
Explanation:
the problem was solved through the experiment and tested
1. Direct Combination or Synthesis ReactionIn a synthesis reaction two or more chemical species combine to form a more complex product.
2. Chemical Decomposition or Analysis ReactionIn a decomposition reaction a compound is broken into smaller chemical species.
3. Single Displacement or Substitution ReactionA substitution or single displacement reaction is characterized by one element being displaced from a compound by another element.
