D. The students were in a hurry. 相关知识点: 试题来源: 解析 A。解析:测量物质质量不一致可能是因为天平没有正确校准,A 选项正确。B 选项物质颜色亮不会影响质量测量。C 选项实验室冷一般不会对质量测量产生直接影响。D 选项学生匆忙可能会导致操作不规范,但不一定直接影响质量测量结果。
What unit is used in measuring the mass of a substance? Identify the metric units cL, km, and cm3. What does each of them measure? What is the standard SI base unit of length? a. 1 km b. 1 m c. 1 N d. 1 mm e. 1 hr ...
What is mass ratio in chemistry? Stoichiometry: Stoichiometry refers to the calculations made to find amount of reactants and products in a chemical reaction. Stoichiometry is based on the law of conservation of mass, where the total mass of reactants will have to produce an equal amount of...
What is mass fraction in chemistry? What is the molar mass of PbI2? What is the molar mass of lysozyme? How do you find the molar mass of a gas? What is the molar mass of Pb(NO3)2? How to get the molar mass of a compound ...
Chemistry is the study of matter and how it changes. Matter is everything that has mass and takes up space, like the air we breathe, the water we drink, and the objects we use every day. Chemistry helps us understand what things are made of and how they interact with each other. ...
Key Takeaways: Mole in Chemistry The mole is anSI unitused to measure the amount of any substance. The abbreviation for mole is mol. One mole is exactly 6.02214076×1023particles. The "particles" could be something small, like electrons or atoms, or something large, like elephants or stars....
terms "mass" and "weight" are used interchangeably in ordinary conversation, but the two words don't mean the same thing. The difference between mass and weight is that mass is the amount ofmatterin a material, while weight is a measure of how the force of gravity acts upon that mass....
Another important milestone was thetheoryof conservation of mass, developed by Antoine Lavoisier in 1783. The law holds that no mass is created or destroyed in a chemical reaction — if someone burns a log in an enclosed container, the container will weigh exactly as much as it did prior to...
In chemistry, µ refers to the elementary particles muon and antimuon. A muon is similar to anelectron. However, its mass is about 207 times the mass of the electron. It is created when an electron collides with its antiparticle positron (e+). The collision creates a photon, which subs...
In chemistry, there are different types of mass. Often, the terms are called weight rather than mass and used interchangeably. A good example is molecular mass or molecular weight. Molecular Mass Definition Molecular mass is a number equal to the sum of theatomic massesof theatomsin amolecule...