What is the chemical formula for water?a) H2Ob)CO2c) CH4d) NaCl 相关知识点: 试题来源: 解析 a) H2O 题目要求判断水的化学式。水由两个氢原子和一个氧原子组成,化学式为H₂O(对应选项a)。其他选项中: - **b) CO₂**:二氧化碳,由碳和氧组成,与水的组成无关。 - **c) CH₄**:甲烷,...
about关于,of……的,表示所属关系,on关于,在……上面,for为了,表示目的,symbol后接of sth,表示象征;后接for sth.表示符号,记号,根据the chemical symbol...water可知,此处指的是"水的化学符号"。故选:D。 【思路点拨】水的化学符号是什么? 【点评】本题考查介词的用法,在熟知所供词的含义基础上,根据句...
For that reason, we began research focusing on the metabolites in green coffee beans that change according to the maturity of the coffee cherries. Roasted coffee beans (left) and raw beans before roasting (right) There are numerous compounds in green coffee beans, some of which exist in very...
Notes to Instructors Chapter 2 Water and Carbon : The Chemical Basis of Life What is the focus ?Basis, The ChemicalWhat, LifeWhat, Compounds
cardboard boxes, styrofoam padding, and bubble wrap are some common examples that protect goods during transport. Before a parcel arrives safely at the consumer’s door, it has already left a trail of environmental destruction in its wake. And all too often, this excess ...
百度试题 结果1 题目1. What is the chemical (化学) formula (符号)of water?相关知识点: 试题来源: 解析 H2O 水的化学式是H₂O,表示每个水分子由两个氢原子和一个氧原子组成。反馈 收藏
What is the chemical symbol for water?A) H2OB) CO2C) NaClD) O2 相关知识点: 试题来源: 解析 A) H2O 1. **选项A分析**:水(H₂O)由两个氢原子(H)和一个氧原子(O)组成,符合水的分子结构,选项正确。2. **选项B分析**:CO₂是二氧化碳的化学式,与水的组成无关,错误。3. **选项C分析**...
Artificial Intelligence (AI) has the potential to be a powerful tool for tackling some of the world’s most pressing problems. Here are a few key areas where AI could make a significant impact: Climate Change and Sustainability Modeling and Prediction:AI can analyze vast datasets on climate pat...
There are over three million known compounds,with no end in sight as to the number that can and will be prepared in the future.Each compound is unique and has characteristic physical and chemical properties.Let us consider in some detail two compounds——water and mercuric oxide.Water is a ...
Ameh, Tiffany. What Are The Solutions To Water Pollution? last modified March 24, 2022. https://www.sciencing.com/solutions-water-pollution-7202971/ Recommended Anna Usova/Getty Images While some scientists are hard at work investigating phenomena beyond Earth, others are still making new discoveri...