According to the law of conservation of matter, how must a chemical equation be
written?
The same coefficient must be applied to every molecule i the equation.
The subscript of every element must be the same on tal side of the equation.
An equal number of compounds must appear on each side of the equation.
An equal number of atoms must be on both sides of the equation.

For this car, predict the shape of a graph that shows distance (x) versus time (t). note that time is the independent variable and will be on the bottom axis. need asap

Car batteries are often rated in amp-hours. this rating indicates the quantity of charge that can pass through the battery before the battery's chemical energy must be restored by the car's generator or some other source. the amp-hour unit is convenient for simple calculations. for example, a 60-amp-hour battery can supply a current of 1.0 a for 60 h (or 60 a for 1.0 h) before going dead. find the energy stored in the following. (a) a 58 a-h, 10 v car battery(b) a 1.3 a-h, 1.7 v flashlight battery

Eof 20 degrees. the index of refraction of air is 1.0003, and the index of refraction of water is 1.33. the angle of refraction rounded to the nearest whole number is °.