What change in the mass number of a nucleus occurs when the nucleus emits an alpha particle? 1. the mass number decreases by 2. the mass number decreases by 4. the mass number increases by 4 the mass number increases by 2.

To separate a mixture of hard candies nd marbles the most efficient method would be

An experiment is conducted to see if cats preferred skim milk or 2% milk. a cup of skim milkwas put out for 5 kittens and then measured how much the kittens drank over the course of aday. following a cup of 2% milk was purout for the skittens and then masured how much thekittens drank over the course of a day. the same kittens were used and the milk was served atthe same temperature. it was discovered that the cats liked the 2% milk more than the skimmilk. what is the dependent variable in this experiment?

0.070g of hydride of carbon occupies 56cm^3 at s.t.p when vaporized and contained 14.29% by mass of hydrogen.what is the formula for the hydrocarbon