During a camping trip, sierra collected dry branches and broke them into smaller pieces. she then placed the sticks in a fire pit and used a match to light the sticks on fire. next, she propped a metal pan of water over the fire and heated it until the water boiled. which list correctly describes physical and chemical changes that occurred in this scenario? physical change: breaking sticks chemical changes: lighting the fire, boiling water physical change: boiling water chemical change: breaking sticks, lighting the fire physical changes: lighting the fire, boiling water chemical change: breaking sticks physical changes: breaking sticks, b

Lab reagent, hypothesis test. a reference solution used as a lab reagent is purported to have a concentration of 5 mg/dl. six samples are taken from this solution and the following concentrations are recorded: (5.32, 4.88, 5.10, 4.73, 5.15, 4.75) mg/dl. these six measurements are assumed to be an srs of all possible measurements from solution. they are also assumed to have a standard deviation of 0.2, a normal distributin, and a mean concentration equal to the true concentration of the solution. carry out a significance test to determine whether these six measurements provide reliable evidence that the true concentration of the solution is actually not 5 mg/dl.

How can a give a full method for the experiment of separating sand from water by filtration? 1-materials 2-steps 3-conclusion also for water and salt separated by the evaporation or distillation process

Increasing the substrate concentration in an enzymatic reaction could overcome which of the following? a) the need for a coenzymeb) allosteric inhibitionc) competitive inhibitiond) insufficient cofactors