Để kéo dài tuổi thọ bảo quản của vải Thanh Hà, vải sau khi thu hoạch ở độ chín sinh lý 80 % được xử lý với dung dịch carbendazim 0.1% trong 3 phút, axit oxalic 5.1 mM trong 10 phút. Sau khi bề mặt quả được làm khô nhờ không khí, vải được cho vào túi polypropylene có diện tích đục lỗ là 0.01% và được giữ trong kho lạnh ở 6 oC, áp suất 105Pa. Sau 40 ngày bảo quản người ta lấy mẫu khí trong túi polypropylene và đo được nồng độ phần mole của các khí như sau: O2: 13 %; CO2: 0.5 %; N2: 86.5 %.A) Anh (Chị) hãy tính nồng độ phần khối lượng của mỗi loại khí trong túi. B) Anh (Chị) hãy tính áp suất riêng phần của mỗi loại khíc) Anh (Chị) hãy tính nồng độ mole của mỗi khí trong túi biết thể tích của túi là 500 cm3.

Why is alchemy not considered to be a science ?

How many dots must be added to the symbol to properly represent a standard nitrogen ion? a) 1 b) 3 c) 5 d) 8

Need asap which of these is an example of a hypothesis? (2 points) a. adults were not interviewed b. the investigation was time consuming c. the source of information was biased d. very few teenagers were interviewed scientists in different parts of the world have conducted experiments to find the speed of light in vacuum. if the results of the experiments are identical, they would most likely be (2 points) a. valid b. biased c. unreliable d. non-observable which of these questions can be answered using science? (2 points) a. what is the best career? b. does water exist on venus? c. should the use of automobiles be stopped? d. which is the most interesting subject to study? the models can be best used to (2 points) recreate something which is easily observed in nature prove that all atomic theories have the same meaning demonstrate the transformation of atomic theory into law represent the locations of subatomic particles in different atomic theories 22. (bws.06) scientists earlier believed that the lowest measurable temperature is the freezing point of ice. however, modern scientists believe that temperatures below the freezing point of ice can also exist. what best accounts for these different opinions? (2 points) scientists propose contradictory ideas to include all possibilities scientists come up with different hypotheses without enough evidence scientists propose different ideas to avoid repetition of scientific knowledge scientists having different interests may interpret the same data in different ways based on the graph, what is the most likely mass of an apple chosen randomly from the basket? (2 points) between 0.10 kg and 0.12 kg between 0.12 kg and 0.14 kg between 0.14 kg and 0.16 kg between 0.16 kg and 0.18 kg a scientist studies a model of a widely accepted theory about the position of planets and sun. the model would most likely the scientist to (2 points) prove that the theory would not change in the future demonstrate how the theory can be changed into a law understand facts which cannot be easily observed prove that all other facts about the universe are incorrect one scientist discovered a new theory on the evolution of the universe. what is the next step for the scientist to take? (2 points) transform the results of the theory into universal laws of nature inform the scientific community so they can verify the results call a press conference to make the discovery popular among people encourage scientists worldwide to find an appropriate application for the results the students' observations are listed below. when an iron nail is taken near the north pole (n) of the bar magnet, it is pulled towards the magnet. when an iron nail is taken near the south pole (s) of the bar magnet, it is pulled towards the magnet. the experiment was repeated by several students using different bar magnets. based on the investigations, which of these theories would the students most likely propose? (2 points) magnets attract iron nails the poles of a magnet attract all materials iron nails are attracted towards all materials iron nails have the same properties as magnets