What is necssesary for a plant to exhibit phototropism

If 10.g of agno3 is available, what volume of 0.25 m agno3 can be prepared

Given the following reaction: c3h8+5o2=3co2+4h20 how many grams of co2 will be produced 7 g of c3h8 and 98 g of o2

Which of these is not an example of chemical weathering? a. iron-rich mineral rusting b. feldspar turning into clay c. limestone reacting with acid d. granite breaking up into sand