Plz hurry it's urgent! which describes a process where a precipitate is formed? a. a solution of agno3 is added to a solution of cacl2 to produce solid agcl and a solution of cano3. b. propane gas combusts to form co2 and h2o. c. a solution of hcl mixes with a solution of ca(oh)2 to produce h2o and cacl2. d. a solution of h2so4 mixes with a solution of naoh to produce water and na2so4.

Group control group #1 experimental group yes yes yes control group #2 no new drug orange juice bed rest no yes no yes ves which of the following is the best explanation of why a second control group was included in this experiment? o a. to provide the volunteers in the study with something to drink o b. to prove that the common cold cannot be cured c. to confuse anyone who is trying to steal their new drug and sell it as their own invention o d. to researchers conclude that results are related to the new drug and not to the orange juice submit e previous