What substances make up water?Water:Elements are referred to as pure substances that are comprised from atoms. Water is considered as a purest substance. It comprises of two different kind of atoms. The molecular formula of water is {eq}{{\rm{H}}_{\rm{2}}}{\rm{O}}. {/eq}...
What substances make up water? What are the physical properties of pure iron? What are the two types of iron? a) What do you get when you burn metals and non-metals? b) What do you get when you put these products in water? Explain the difference between iron in the b...
(of)13.take after17.cut off14.set up18.get out of15.make a difference19.be in control of三、根据汉语提示完成句子20.give up1.could visit;cheer them up三、根据汉语提示完成句子2.listen to;care for1.too much;enough water3.by herself at the age of four2.without thinking twice4.once a...
51. make a decision 52. take risks 53. give up What's the matter I have a stomachache. You shouldn't eat so much next time. What's the matter with Ben He hurt himself. He has a sore hack. He should lie down and rest. Do you have a fever Yes, I do./No,I don't./I do...
to one's surprise 7. be used to10. hand out8. get out of 9. 胃痛 10.躺下 11.量体温 12.发烧13.休息 14.下车 15.冒险 16.切除 17.放弃11. fix upUnit 2 I'll help to clean up the city parks.12. give away13. take after一、重点单词14. set up1.欢呼:喝彩(v.)15. make a ...
Warming-up What Are Substances Composed of? The theory of four elements As recently as a few thousand years ago,western scientists considered the whole earth to be made of 4 elements:Earth,Air,Fire,and Water.Air was the underlined element:this single substance made up everything in the world...
Water is a powerful drink and a universal solvent. As such, it can dissolve and absorb molecules from several substances. Thetotal dissolved solids (TDS) levelis the number of particles dissolved in a volume of water. TDS has two forms:organicandinorganic. Understanding and calculatin...
23. We need to ___ (mix) the flour with water to make dough. 24. The ___ (bake) cake smelled delicious and attracted everyone. 25. He ___ (store) the leftover food in the fridge after the party. 26. The ___ (host) of the cooking show introduced a new recipe for pasta. 2...
due to the oxygen atoms that have many pairs of unshared electrons. Substances that are soluble in oil and water, such as lecithin, are known as emulsifying agents. Phospholipids also play an important role in the body. Because they are able to form lipid bi-layers, phospholipids are a maj...
Make sure your child spits all of the toothpaste out. He or she does not need to rinse with water. The small amount of toothpaste that stays in your child's mouth can help prevent cavities. From 3 to 6 years, your child needs to have his or her teeth brushed with fluoride toothpaste...