How many moles of ZnCl2 will be produced from 21.0g of Zn assuming CuCl2 is available in excess

True or false, the three major scales used to measure earthquakes are mercalli scale, richter scale and magnitude scale

Why does his teacher ask him to balance the equation by including the correct coefficient

2pos suppose an object in free fall is dropped from a building. its starting velocity is 0 m/s. ignoring the effects of air resistance, what is the speed (in m/s) of the object after falling 3 seconds? give your answer as a positive decimal without units. answer here