Which statement describes chemical reactions that take place at different rates?
a. one reaction produces more products than the other.
b. one reaction begins with more reactants than the other.
c. one reaction takes place in less time than the other.
d. one reaction involves a color change and the other does not.

Marcel just purchased 1.69 grams of iron fillings in order to make living putty for his 6 year old niece. how many moles of iron are made in his sample?

100 grams of molten lead (600°c) is used to make musket balls. if the lead shot is allowed to cool to room temperature (21°c), what is the change in entropy (in j/k) of the lead? (for the specific heat of molten and solid lead use 1.29 j/g⋅°c; the latent heat of fusion and the melting point of lead are 2.45 × 104 j/kg and 327°c, respectively.)

Which are forms of frozen water? check all that apply. dew frost hail rain sleet