List four common signs that a chemical reaction has occurred.

Which of these is indication that a chemical reaction has occurred? A. Freezing of a substance B. Melting of a substance C. Boiling of a substance D. Formation of a Preciptate

Choose all the answers that apply. Which of the following usually indicates a chemical reaction? gas bubbles color change increase in temperature decrease in temperature release of light energy

What is 409,614 rounded to the nearest thousand

A 4 gram metal object displaces 2 mL of water in a graduated cylinder. What is the density of the metal object?

Explain how salinity and temperature affect water density and how the salinity of the oceans can be both increased and decreased.

BaBr2 is a ionic compound, Covalent compound or a acid

What are the structural features of purines and pyrimidines?

Why does bromine not react with sulphur?

What happens to the size of the atom of anon-metal as it becomes an anion? A. it decreases B. it increases C. it remains the same D. it is impossible to tell unless you know the specific element

How is oxygen and nitrogen alike