<span> no particles are created or destroyed: the atoms are simply rearranged from the reactants to the products. The products may have different </span>properties<span> to the reactants. </span>Mass<span> is never lost or gained in </span>chemical reactions<span>. We say that </span>mass<span> is always conserved.</span>
(4) electrolysis requires an external power source <span />
V(H₂O)=500 mL
p(H₂O)=0.9982 g/mL
m(H₂O)=V(H₂O)p(H₂O)
mass of salt solution:
m=m(H₂O)+m(CuSO₄)=V(H₂O)p(H₂O)+m(CuSO₄)
w = m(CuSO₄)/m
w=m(CuSO₄)/{V(H₂O)p(H₂O)+m(CuSO₄)}
w=2.5/{500*0.9982+2.5}=0.004984 (0.4984%)
Answer:
B. The order in which specific traits may have evolved
Explanation:
