Lesson 3.01: History of the Periodic Table 1. Explain how scientific observations led to the development of‚ and changes to‚ the periodic table. Dmitri Mendeleev- first periodic table‚ organized 63 known elements according to properties‚ organized into rows and columns. He wrote names‚ mass and chemical properties on each. Julius lothar Meyer- independently worked in German ‚ similar to Mendeleev Henry Gwyn Jeffrey’s Moseley: worked with Ernest Rutherford experimented with 38 metals‚ he found that
Free Periodic table Atom
basic or amphoteric oxides | Form acidic or neutral oxides | Ionisation | Lose electrons to form positively charged ions | Gain electrons to form negatively charged ions | Why are Alloys stronger & harder than pure metals? * Different sizes of atoms * Disruption in the orderly arrangement of atoms * Layers of atoms cannot slide over each other easily Reactivity of Metals Metals | Reaction with oxygen | Reaction with water | Reaction with steam | Reaction with dilute acid |
Premium Oxygen Iron Carbon dioxide
Atomic radius: size o atom (picometrs) (increases down cuz more levels outweigh nuc charge‚ increases to the left cuz of less nuc charge for same number of lvls) * Ionic Radius: radius as an atom becomes an ion (decreases since an element has one fewer energy level as it becomes a positive ion loses electrons) *increases downwards cuz more energy lvls to begin with even after losing‚ *increases to theleft cuz of less
Free Atom Chemical bond VSEPR theory
Results and discussion: I. a. How would you compare that relative reactivity of Na and k -Sodium and potassium react somewhat similar when reacting with water however they are slightly different. Sodium moves because of the hydrogen coming off of it and has a low melting point while potassium’s reaction is faster and enough heat is produced to set light to the hydrogen coming off of it. Each leaves a pink color hue in the water. Discuss the similarities and differences in the behavior of the metals
Premium Chemistry Chemical reaction Water
preparation‚ properties and uses; compounds of nitrogen: preparation and properties of ammonia and nitric acid‚ oxides of nitrogen (structure only); Phosphorous-allotropic forms; compounds .of phosphorous: preparation and properties of Phosphine‚ halides (PCl3‚ PCl5) and oxoacids (elementary idea only) Group 16 elements: |Symbol |Atomic |Electronic configuration | | |number | | | |8 |[He]2s22p4
Premium Oxygen Electronegativity Chlorine
Chemistry Summary The particle theory: 1. Matter is made of tiny particles 2. Particles of matter are in constant motion 3. Particles of matter are held together by very strong electric forces 4. There are empty spaces between the particles of matter that are very large compared to the particles themselves. 5. Each substance has unique particles that are different from the particles of other substances 6. Temperature affects the speed of the particles. The
Free Atom Electron Covalent bond
to smaller alkenes and alkanes‚ until ethene‚ propene‚ (or both) are formed. Catalytic Cracking allows greater output of high-demand products. Identify that ethylene‚ because of the high reactivity of its double bond‚ is readily transformed into many useful products Ethylene‚ because of the high reactivity of its double bond‚ can form many useful products‚ such as plastics (polyethylene). For example‚ ethene can react with water to form ethanol‚ with a H3PO4 catalyst at 300oC. Ethene can react
Free Carbon dioxide Oxygen Electrochemistry
Chapter 1 Chemical Reactions and Equations Q.1. Why should magnesium ribbon be cleaned before burning in air ? Ans: Magnesium ribbon is a very reactive metal. When stored it reacts with oxygen to form a layer of magnesium oxide on its surface. This layer of magnesium oxide being a stable compound prevents further reaction of magnesium with oxygen. The magnesium is cleaned before burning in air to remove this layer so that the metal can be exposed to air properly. Q.2. Write the balanced
Premium Hydrochloric acid Hydrogen Chlorine
pair of electrons to form a new bond. They can also be called Lewis bases as they accept proton from electrophilic species. Grignard reagent can be simply prepared by redox reaction of magnesium metal and alkyl halide in dry diethyl ether solvent. In this experiment the alkyl halide use is bromobenzene‚ to form the reagent phenylmagnesium bromide. Figure 1: reaction of Mg and bromobenzene. Phenylmagnesium bromide was expected product of this reaction however there are some by-product such as
Premium Nucleophile Magnesium Alcohol
Peak at 57 is the molecular ion less one hydrogen: C3H5O+ (the H may be lost from any carbon: you do not need to be able to predict which one will lose it) Peak at 29 could be CH3-CH2+ OR else CHO+. (These two could be distinguished by very accurate and precise high resolution
Premium Oxygen Ethanol Alcohol