CHAPTER 10 - Radioactivity and Nuclear Processes Composition of atomic nucleus - neutrons and protons Nuclides are nucleus of different isotopes, which is represented by the symbol [pic]X - X being symbol of the element. A is the mass number, which is the sum of number of protons & neutrons; Z is the atomic number, the number of protons, which also represents the nuclear charge. Number of neutrons = (A – Z). For example, the symbol of carbon-14 nuclide is [pic]C, which means a carbon-14 nuclide has 6 protons and 8 neutrons. The nuclide symbol of lead-206 is [pic]Pb.
Main – group metals usually for one cation (positive ion). In a binary ionic compound the metal (cation) is named first. Then the nonmetal (anion) is named, and the suffix -ide is added. To create the formula, you switch the charges, and that tells you how many of each element you will need. For example: Cation Anion Formula Name of Compound Ba2+ I- Ba2+ I- Barium Ion Iodide Ion BaI2 Barium Iodide Type 2: Binary Ionic Type 2 Binary Ionic compounds consist of a metal and a nonmetal.
Manganese(III) acetylacetonate is an one- electron oxidant. Manganese(III) acetylacetonate is high spin. It has also a distorted octahedral structure. This distortion is due to the Jahn-Teller effect. (Absolute Astronomy, 2009).
Chemistry Design Lab Kim Li Feb 20th,11 Investigating the effect of different concentration of nitric acid on the its drop volume DESIGN Introduction: Intermolecular forces are forces that hold molecules together. They play important roles in determining the properties of a substance, properties such as boiling point, volatility, viscosity, miscibility, and electrical conductivity. [6] Examples of intermolecular forces include Van der Waals forces, dipole-dipole forces, and hydrogen bonding. Van der Waals forces are temporary dipole all species can form due to uneven distribution of electrons. Dipole-dipole forces are permanent dipoles due to different electronegativity.
(2) hydrogen ion contains 1 electron and 1 proton, H+ ion forms when H ion lost an electron, and therefore it’s is the same thing as a proton 6. What is the chemical formula for a hydronium ion? (1) H3O+ 7. Show the relationship between a proton and a hydronium ion. Explain why one is essentially the same as the other.
Gallium, indium, aluminium, boron. Indium, gallium, aluminium, boron. JSC 2006, Physical Science [Turn over 2 5 The combination of protons, neutrons and electrons for a neutral atom of magnesium, 24 Mg, is: protons electrons A 10 14 11 B 11 13 12 C 12 12 12 D 6 neutrons 12 12 10 Which structure represents an atom of the noble gas in the first period. e e e pn np np pn n np p e e e e e e A 7 e e e pnn pnn npp e B C e e e D A mixture containing a soluble salt, sand and iron filings, can be separated into its components using techniques: R: use of
Title: Investigating the properties of period 3 oxides Objective: To examine the oxides of period three elements and describe their structure and bonding. Introduction: Generally, there are here are three types of oxide which is the basic oxide, acidic oxide and amphotheric oxides. The metals have basic oxide, the semi-metals have amphotheric oxide and the non-metals have basic oxide. Structurally there are covalent or ionic compounds. In period 3 oxides, a few oxides are tested which is sodium peroxide, magnesium oxide, phosphorus (V) oxide, silicon (IV) oxide, sodium sulphite and concentrated sulphuric acid.
5. 5. II. Mass Defect and Nuclear Binding Energy Consider a helium-4 atom: (_______ protons, _________ neutrons, and __________ electrons) Recall: 1 proton = 1.007277 u, 1 neutron = 1.008665 u, and 1 electron = 0.000548 u We would expect the mass of a helium-4 atom to be as follows: 2(1.007277 u) + 2(1.008665) + 2(0.000548) = 4.032980 u However the observed mass of a helium-4 atom is 4.002596 u!!!!!! There is a difference of 0.030384 u between the observed mass and the calculated mass.
Maximum absorbance occur when mole fraction of ligand is 0.65. [pic] = [pic] = [pic] = [pic] = [pic] mole fraction of metal ion : mole fraction of ligand = 1 : 2 ≈ 1 : 2 Therefore, formula of the complex: [Cu(en)2]2 Table 2 |Solution |Color Of Solution |Absorbance |Mole Fraction of Ligand | |1 |Very Light blue |0.224 |[pic] = 0.30 | |2 |Lighter blue |0.280 |[pic] = 0.40 | |3 |Light blue |0.420 |[pic] = 0.45 | |4 |Blue
A. barium sulphate B. calcium carbonate C. silver chloride D. sodium nitrate 3. An element X forms a hydroxide, which dissolves, both in acids and in alkalis. What could X be? A. aluminium B. calcium C. copper D. iron 4. In which reaction is dilute sulphuric acid not behaving as an acid?