Which factor is most important to keep the same when comparing the hardness of solids? A. The temperature of the hot plate
B. The amount of each substance
C. The intensity of the light
D. The method of making a scratch on the material​

Amount of liquid measured in l or lm

Surface currents are caused by blank space . question 14 options: surface currents are caused by? differences in water temperature high salinity differences in density wind forces

At a certain temperature the rate of this reaction is first order in hi with a rate constant of : 0.0632s2hig=h2g+i2g suppose a vessel contains hi at a concentration of 1.28m . calculate how long it takes for the concentration of hi to decrease to 17.0% of its initial value. you may assume no other reaction is important. round your answer to 2 significant digits.