HSC Chemistry Assessment task 1 Nuclear Chemistry Research report 1. Distinguish between stable and radioactive isotopes and describe the conditions which a nucleus is unstable. To understand if an element is stable we first must understand what stability is. The stability of the nucleus is directly related to the strength of the forces that hold the nuclear particles together. These protons and neutrons of the nucleus are called nucleons.
Bonding Fill in the missing words, the first letter of the blank words are an anagram of a key bonding word. What is the mystery word??? Why do Chemical bonds form? Bonds between atoms involve their outer electrons. When atoms bond together they share or transfer electrons to achieve a more stable electron arrangement, often a full outer main level of electrons, like the noble gases.
When two different atoms are bonded together, each attracts the electrons differently like a tug-of-war between two unequal teams, producing a dipole. The positive part of one molecule is then attracted to the negative part of another molecule. The shape of a molecule also contributes to the formation of a dipole. Molecules containing three or more atoms may be linear in shape or bent. Depending on how symmetrical or how bent the molecule is, the formation of a dipole in molecules will differ.
Explain the difference between polar covalent and nonpolar covalent bonds. ________________________________________________________________________ ________________________________________________________________________ PART 3 1) Explain why beryllium loses electrons when forming ionic bonds, while sulfur gains electrons. ________________________________________________________________
Chemistry chapter 6.3 1) a. Cation b. Electrostatic forces 2) Ionic bond between metal and oxygen, the metals conduct electricity in a solid state using delocalised electrons. They are coated with a special kind of plastic e.g. Copper. 3) When they contain 8 valance electrons. 4) When naming an ionic compound, which ion is given first?
high melting point, hard, brittle, slightly soluble in water, conductor of electricity when melted or in solution Molecular solid - crystalline solid that has molecules arranged in a particular configuration. low melting point, generally insoluble in water, nonconductor of electricity. Metallic solid - crystalline solid that has atoms of metals arranged in a definite pattern. low to high melting point, malleable, ductile, conductor of electricity, insoluble in most solvents. Lesson 13.6 Changes of physical state: * necessary to draw a temperature-energy graph to see the change in temperature with a constant application of heat Heat of fusion - the amount of heat required to melt 1.00 g of substance.
Exothermic and endothermic reactions. First law of thermodynamics and enthalpies of reactions. Calculate standard enthalpies of formations (using the equation on page 191). Electromagnetic radiation, photoelectric effect and continuous and line spectra. Energy levels and electron configurations (including representation using orbital diagrams) of several common elements on the periodic table.
Bonding Formal Lab Introduction (with Background information): Any substance, whether it is a metal or nonmetal, people can determine it by seeing if it is shiny, soft, or reactive. Metals are shiny, reactive, and have high melting points, while nonmetals are soft, have low melting points and not very reactive, and that is how anyone can determine whether a substance is a metal or a nonmetal. Covalent bonding is when two atoms share electrons, but it only occurs in two nonmetals only. They have low melting points and they are not soluble. Although, Ionic bonding is when an atom gives away elections to another atom, which only happens in a metal and a nonmetal, and they have high melting points and are soluble.
Some chemical properties of phosphorus are that it is reactive with, air at times, and it is poisonous, it also has an electronic shell. Some physical properties of phosphorus are it is white, red, black, has a melting point, and a boiling point, and it also gives its color in a
Giant magnetoresistance, which is best to be called as GMR, where GMR refers to the resistance of two terminal devices consisting of alternating layers of non-magnetic and ferromagnetic films. The effect is manifested as a significant electrical resistance change depending on the relative magnetization direction of the adjacent ferromagnetic layers. The resistance is high when the ferromagnetic layers are in antiparallel configuration (magnetization direction opposite) and low for parallel configuration (magnetization direction