Answer:
The sign is negative (-)
Explanation:
it shows that heat was give off to the surrounding
Answer:
The line of sight must be perpendicular to measuring scale to avoid parallax error. Formation of bubbles inside the cylinder should be completely avoided.
Explanation:
Answer:
Physical
Explanation:
No new properties were added, a blue liquid and a clear liquid making a blue liquid is just a mixture because they have not chemically combined.