Which of the following chemical equations proves that the law of conservation of mass is in effect? Question 2 options:

Mg2 + LiBr ---> LiMg + Br

2KCl + F2 ---> 2KF + Cl2

Na +O2 ---> Na2O

H20 ---> H2 + O2

Acontrol during an experiment. might change remains constant does not exist does change

Astudent is trying to create a table that compares hypotheses, theories, and laws. hypothesis theory law do scientific researchers formulate it? yes yes yes does it explain why things happen? yes yes no yes yes yes is it used to make predictions? no yes yes which of the following questions would most likely fill the blank in the table? is it an intelligent guess? is it newly formulated? is it based on observations? has it been proved?

The reactions of photosynthesis occur in the of plant cell? a.mitochondria. b. lysosomes. c. chloroplasts. d. chlorophyll