What are the numbers that must be placed in the black to balance the chemical equation

1,2,1,2
2,1,1,2
2,1,2,1
1,2,2,1

Biology 1c cumulative exam i need awsners

What happens whenever a net force acts on an object

Graded assignment lab report answer the questions below. which combinations of substances resulted in a chemical change? for each metal that participated in a chemical change, write the type of metal it is, based on your examination of the periodic table. were there any metallic compounds that did not react with either the acid or the base? write the type of metal, based on your examination of the periodic table. make a general statement about the reactivity of the metals in this experiment.