Cho 70,5gam hỗn hợp CuO và Na2O tác dụng vừa đủ với 13,5g nước. a) TÍnh phần trăm khối lượng mỗi oxit trong hỗn hợp
b)Tính m dung dịch H2SO4 19,6% hoà tam hết oxit ban đầu

What will most likely happen in the absence of a cell membrane? a) photosynthesis will not take place. b) the cell will not store food, water, nutrients, and waste. c) energy will not be released during cellular respiration. d) substances will pass in and out of the cell in an uncontrolled manner.

What is a main difference between a mixture and a pure substance? a mixture is only a liquid, but a pure substance can be in any state.a mixture looks the same throughout, but a pure substance does not.1 a mixture can vary in composition, but a pure substance has a set composlo a mixture can be made up of a single compound, but a pure substance car

Rank the four gases (air, exhaled air, gas produced from from decomposition of h2o2, gas from decomposition of nahco3) in order of increasing concentration of co2