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.

This is what i found on google “according to the collision theory, the following criteria must be met in order for a chemical reaction to occur: molecules must collide with sufficient energy, known as the activation energy, so that chemical bonds can break. molecules must collide with the proper orientation.” i hope this information you.

Ithink it is c ,i hope i you

The figure is missing but we can answer anyway.the correct answer is "releasing the string". in fact, when the person is holding the bow and the arrow, the kinetic energy of the arrow is still zero (because the arrow is not moving). the moment the arrow is released, it acquires a velocity v, so its kinetic energy will become different from zero: where m is the mass of the arrow and v its velocity.  all the other options, instead, do not increase the kinetic energy of the system: -  pulling farther back on the string : this will just increase the elastic potential energy of the system-  holding the arrow higher: this will increase the gravitational potential energy of the system (which is given by u=mgh, where h is the height above the ground)-  decreasing the mass of the arrow: this will decrease the gravitational potential energy of the system (which is given by u=mgh, where m is the mass)