Which of the following statements best describes the relationship between elements and compound

How many liters of oxygen gas, at standard temperature and pressure, will react with 35.8 grams of iron metal? 4 fe (s) + 3 o₂ (g) → 2 fe₂o₃ (s)

Take a look at this dandelion. the yellow flower on the right is pollinated and the seeds on the left are transported by

Which change to the system wood cause the freely-moving piston to lower?