Somewhat of the same element, have same amount of protons but different number of neutrons. <span />
C.
They broke down mixtures by chemical means.
The answer is (d)
Electrons are outside the nuclues in energy levels. Protons have a positive charge, neutrons have no charge, and electrons have a negative charge. A neutral atom contains equal numbers of protons and electrons
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If it's an endothermic reaction, then that means heat is being added to the system therefore H>0. Entropy is disorder, and since there are more moles on the products side, entropy is increasing therefore S>0 as well.
Answer: A chemical reaction that stores energy is called an endothermic reaction. More energy might be released as products form than the energy needed to break the reactants apart.
Explanation: