1. 由第一段第二句“It is a way to get more oxygen.”可知。 2. 由第一段最后一句“Yawning is one thing that newborn babies do often.”可知此句错误。 3. 由第一段第三句“they yawn to help stay awake.”可知。 4. 由第二段第一句可知。 5. 由短文最后一句“Even small mice and huge...
Why is oxygen from moon dust difficult to use? A. It is tough for human beings to get moon dust. B. It is chemically fixed in the form of minerals or glass. C. The conditions of moon dust are terrible. D. There E. xits only a little of it. 答案: B 分析: 答案B 解析 细节...
Why is glucose important to a plant cell? Why is oxygen needed in the electron transport chain? Why are enzymes important to the human body? Why is the cell cycle important? Why does O2 come from H2O in photosynthesis? How does your heart deliver oxygen to your body cells? Why do large...
A 4: Many products are sensitive to oxygen. Fats and oils upon exposure to oxygen—especially in the presence of light—undergo chemical changes which lead to flavor alterations referred to as rancidity.doi:10.1007/978-1-4615-3908-7_4FAIC Arthur Hirsch Ph. D....
What is the oxidation number of the oxygen atom in H2O2? Explain how to find the oxidation number of an element. How to find oxidation number What are the oxidation numbers for ClO-? What is the reactant in a redox reaction that readily donates electrons ...
Hydrogen is the simplest, cleanest and most abundant element in the universe. Fuel cells generate electricity through an electro-chemical process that combines hydrogen and oxygen to produce pure water as a by-product. Winning technology Organisations who operate in off-grid environments are looking ...
Step-by-Step Solution:1. Determine the Percentage of Oxygen in Air: - The composition of air is made up of various gases. The most significant component is nitrogen, which makes up about 78% of the atmospher
根据文中Yawning is one thing that newborn babies do often.打哈欠是新生儿经常做的一件事。可知新生儿是知道如何打哈欠的,故填B。 【3】细节理解题。根据文中When people are sleepy, they yawn to help stay awake. This is because of fresh oxygen.当人们困倦时,他们打哈欠帮助保持清醒。这是因为新鲜的...
Prior to the lab component a brief presentation is given and questions are asked (e.g. "When you lose weight, where does it go? Literally, where is the mass you lost?") to help students understand the chemistry of the breakdown of fat stores with inhaled oxygen and subsequent carbon ...
O2 C6H12O6 Fish and aquatic animals cannot split oxygen from water (H2O) or other oxygen-containing compounds. Only green plants and some bacteria can do that through photosynthesis and similar processes. Virtually all the oxygen we breath is manufactured by green plants. A total of three-fourths...