3. the chemical equation for what happened to the zinc in the boiling sodium hydroxide is written below:
zn (s) + 2 naoii (aq) + 2 h20 (1) ► nazzn(oii)4 (aq) + ii2 (g)
does this equation represent a physical change or a chemical change? how do you know?
physical change

How many moles are in 7.2 x 10^23 carbon molecules? (*round to the nearest hundredth and include the unit "mol c" after your number) question 6 options:

Which of your 24 wells had indications that a chemical reaction occurred? how were you able to tell that a chemical reaction occurred? which of your 24 wells had indications that a physical reaction occurred? how were you able to tell that a physical reaction occurred? report on both mixing and evaporation. make a general statement about whether your hypotheses were validated or rejected. must your hypotheses be correct for this to be a successful laboratory?

How many grams of ammonia would be produced by the decomposition of 16.93 mlof hydrazine? (the density of hydrazine is 1.021g/ml)