Iron reacts with oxygen in the air to make rust. Which of the chemical equations matches the reaction above?
A.
4Fe + 3CO2 2Fe2C3O3
B.
4Fe + 3O2 2Fe2O3
C.
2I2 + 3O2 2I2O3
D.
2I2 + 3CO2 2C3I2O3

Which element is the least metallic between cadmium, silver, zinc, or iron?

Select all the correct answers. which compounds have the empirical formula ch20? (multiple answers)a. c2h4o2b. c3h603c. ch2o2d. c5h1005e. c6h1206

Consider a culture medium on which only gram-positive organisms such as staphylococcus aureus colonies can grow due to an elevated nacl level. a yellow halo surrounds the growth, indicating the bacterium fermented a sugar in the medium, decreasing the ph as a result and changing the color of a ph indicator chemical. this type of medium would be referred to as a differential and enrichment culture.