1.Which of these statements about the conservation of mass is not correct?
A. The mass of the products will be equal to the
mass of the reactants.
B. During a chemical reaction, no mass is
created or destroyed.
C. There will be the same number and type of
atoms before and after a chemical reaction.
D. All of the above are correct.

For the following, determine the type of reaction and then give products.

When a spring is compressed, the energy changes from kinetic to potential. which best describes what is causing this change?

Balance and in which category does it fit in? single or double displacement or synthesis or decomposition? (a) k2 o → k + o2 (b) na + i2 → nai (c) cu(no3 )2 + naoh → cu(oh)2 + nano3 (d) kclo3 → kcl + o2 (e) ca(no3 )2 + hbr → cabr2 + hno3 (f) sn(oh)2 → sno + h2 o (g) p4 + n2 o → p4 o6 + n2 (h) fe + al2 (so4 )3 → feso4 + al (i) alcl3 + na2 co3 → al2 (co3 )3 + nacl (j) c3 h6 + o2 → co2 + h2 o