A ___ is a substance made up of only one type of atom.相关知识点: 试题来源: 解析 element 题目询问的是“由仅一种原子构成的物质”,通过化学知识可知,这种物质称为元素。元素是纯净物,其基本单位是同种原子。选项中的其他可能如化合物(由不同原子组成)或混合物(不同物质混合)均不符合条件,因此...
<p>To find the atomic mass of element X given the mass of a single atom, we can follow these steps:</p><p><strong>Step 1: Understand the relationship between atomic mass and the mass of a single atom.</strong> The atomic mass of an element can be calcula
Carbon chains that contain the maximum number of hydrogens per carbon; only single C-C bonds 饱和键,化合物中C-C之间都是单键 Unsaturated: Carbon chains that don’t have the maximum number of hydrogens per carbon; contain C=C double bonds 不饱和键,C和C之间是双键(Double bond)或者三键(Tripl...
What was the net energy absorbed by the atom in this process? We know photons are what gives light to all objects it touches, but why exactly do they glow/create light? What is the energy of a photon that, when it is absorbed by a hydrogen atom,...
The atom/group of atoms which provide the chemical properties of a substance 官能团,是决定有机化合物的化学性质的原子或原子团。常见官能团碳碳双键、碳碳三键、羟基、羧基、醚键、醛基、羰基等。有机化学反应主要发生在官能团上,官能团对有机物的性质起决定作用,如—X、OH、-CHO、-COOH、-NO2、-SO3H、-...
One mole of substance represents one gram-formula of the substance. One mole of a gas at standard temperature and pressure occupies 22.4 litres. What is the mass in grams of a single atom of chlorine? (Atomic mass of chlorine = 35.5) A6.54×1023g B5.9×10−23 g C0.0025 g D35.5 ...
Which particles in the atom of an element designate the atomic number? Is a single atom or a single molecule considered a substance? What are the electrons in the outermost shell of an atom called? What is an atom that has a different number of neutrons than other atoms of the sa...
An example of a small subset of novel applications are spectroscopy, where the thermoacoustic signal might change depending on the composition of a substance (e.g., CO2 sensors25, oil contamination in water26). In Metrology/thermometry, since the thermoacoustic signal amplitude changes with the ...
A general perception among researchers is that boiling points, which is a key property in the optimization of lubricant performance, are difficult to predict successfully using a single-parameter model. In this contribution, we propose a new graph parame
【题目】微积分求atom A radioactive substance decays exponentially:T he mass at time t is m(t) = m(0)ekt, where m(0) is the initial mass and k is a negative constant. T he mean life M of an atom in the substance is M= from o to in finity -kt(e)^kt dt ...