Use chemical formulas to write the equation for the reaction between oxygen and hyrdogen

Why was the sample heated in step 5? describe the chemical principles involved in the reasoning behind this step?

Looking at this image, what relationship can be drawn from it? the lower the degree of latitude, the lower the degree of temperature there is no relationship between latitude and temperature the higher the degree of latitude, the higher the degree of temperature the lower the degree of latitude, the higher the degree of temperature

How does food concentration affect yeast activity