A powder and a liquid with total mass of 20 grams are combined in an open beaker. A reaction occurs, as indicated by the production of gas of bubbles. The final mass of solution is less than 20 grams. what best explains the difference in mass? A. Not all reactions obey the law of conservation of mass.

B. Mass escaped as a gas from the open container.

C. Some mass was consumed in the reaction.

D. The bubbles show that mass was added to the system.

To protect all four receptacles on a branch circuit that surrounds a swimming pool, you would install which of the following configurations? a. gfci feed-through receptacle at the end of the load's circuit b. gfci-terminated receptacle at the beginning of the load's circuit c. gfci feed-through receptacle at the beginning of the load's circuit and the other receptacles connected to the load side of that receptacle d. gfci-terminated receptacle at each end of the load's circuit

The frequencies refer to the sample data collected from a population of interest when performing a hypothesis test comparing two or more population proportions.

Abatter hits a 0.140-kg baseball that was approaching him at 30 m/s and, as a result, the ball leaves the bat at 40 m/s in the reverse of its original direction. the ball remains in contact with the bat for 2.0 ms. what is the magnitude of the average force exerted by the bat on the ball?