After a chemical reaction, the atomic nuclei are a. split b. combined c. unchanged d. three times larger

After a chemical reaction, the atomic nuclei are unchanged. (C)

The nucleii don't know a thing about the outside world during

physical or chemical processes ... not until NUCLEAR things

happen.

answer: 2×10^-2kg

explanation: density= mass per volume

vol=mass/density

converting to s.i units we have;

3÷1000kg = 0.003

1.5÷100m = 0.15

0.003/0.15 = 0.02kg