: Modeling Chemical Reactions Due 02/01/21 11:59
Keesha performed a chemical reaction, and the products looked quite different from the reactants She knew the amount of matter had not changed due
to the law of conservation of mass According to the law or conspivation of mass, what happens in a chemical reaction?
A Matter is not created or destroyed and the same amount of mass remains
B A new kind of matter is created and the amount of mass either increases or decreases
C Matter is not created or destroyed and the amount of mass may change after the reaction
D. New matter is created and changes form so that the mass of the reactants and the products will almost be equal
no

May someone explain how to do this question?

Amarble, a bowling ball, a basketball, and a baseball are rolling across the floor at 10 m/s. which one has the greatest kinetic energy? the marble the bowling ball the basketball the baseball

Air is held within a frictionless piston-cylinder container, which is oriented vertically. the mass of the piston is 0.45 kg and the cross-sectional area is 0.0030 m2. initially (state 1) the pressure of the gas is sufficient to support the weight of the piston as well as the force exerted by the atmospheric pressure ( 101.32 kpa). the volume occupied by the air within the cylinder in state 1 is 1.00 liter. one end of a spring (with spring constant k = 1000 n/m) is attached to the top of the piston, while the other end of the spring is attached to a stage that can move vertically. initially the spring is undeflected and therefore exerts no force. then the stage is then moved quasistatically downward a distance of 10.0 cm, at which point the system reaches state 2. the piston-cylinder is not insulated; rather it remains in diathermal contact with the surroundings, which are at a constant temperature of 300 k. what is the change of pressure within the container?