Answer:
E
Explanation:
This is because all steps from A-D are important to obtain an accurate result
<span>C. Cooking rice because it needs heat to be cooked. D. A chemical cold pack it's obvious if it generates cold then it needs heat
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Atomic number is same number as the protons...
Neutrons = Mass number - Atomic number ( protons)
Electrons are same number as protons unless the element has a charge..
If it has a charge of +2 it means that the element has 2 less electrons than the neutral atom. If it has a charge of -2 it means that the element has 2 more electrons than what it is supposed to..
I believe its B. <span>The chemical formula for water H2O represents 2 hydrogen and 1 oxygen in the compound. </span>