How do ionic bonds form? Transferring the electron forms an ionic bond. After transferring the electron‚ the two atoms become ion n will attract together because they have the opposite charges. Then an ionic bond is formed. How do covalent bonds form? A covalent bond is for sharing of electrons. I remember it like co-existing electrons to share (Eg H20). It is usually between two non-metals. Which compound‚ sugar or salt‚ is a better conductor of electricity? Explain your answer. Salt
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VCE Chemistry Week 1 - Chemical Analysis (1) Horizen Education February 8‚ 2013 1 1.1 Review: Gravimetric and Volumetric Analysis Gravimetric Analysis Solubilities Always soluble: Usually soluble: Exceptions: Na+ ‚ K+ ‚ NO3− ‚ CH3 COO− ‚ NH+ 4 Cl− ‚ I− ‚ Br− i. Sodium carbonate and Silver nitrate ii. Iron (II) sulfate and Lead (II) nitrate iii. Sodium nitrate and Nickel sulfate iv. Potassium hydroxide and Copper (II) nitrate v. Sodium sul de and Cadmium sulfate Ho
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Describe radioactive isotopes as a source of energy. eg. 235U * Describe the build-up of electrons in `shells` and understand the significance of the noble gas electronic structures and of valency electrons. * Understand that formation of ions implies gain or loss of valence electrons. 2. The Periodic Table. * Describe the Periodic Table as a method of classifying elements in groups and periods and its use to predict properties of elements. * Recognize different blocks in
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The quantitative and qualitative analytical techniques used‚ suggesting improvements for Future investigations D1 Titration: positive aspects of experiment in terms of accuracy -Checking to see if any air bubbles were present and if the burette was leaking before doing the titration. If I did not do this‚ it would alter the end point and hence the titre results. -Recording the volume reading before doing the titration. -Making sure I was
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Date: 20/03/13 Flame Test – Investigating Compounds Aims To identify the presence of a relatively small amount (ie low concentration) of a metal ion in a compound. Method 1. Clean a platinum or nichrome wire by dipping it into concentrated hydrochloric acid. 2. Hold the platinum or nichrome wire at the hottest or blue part of a non-luminous Bunsen flame. 3. Repeat until the wire does not produce any colour in the flame (note: do not touch the wire‚ as salt in sweat will produce
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raise the temperature of 1 gram of a pure substance by 1 degree Celsius Surface tension is a contractive tendency of the surface of a liquid that allows it to resist an external force Dielectric constant is the diminishing of the attraction of the ions for one another by the solvent Osmotic pressure is the pressure which needs to be applied to a solution to prevent the inward flow of water across a semipermeable membrane Hypotonic refers to less solute concentrations. These conditions will cause
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facilitated diffusion? Lipid-insoluble solutes are transported across the membrane by a carrier protein. Coupled transporters that move solutes in the same direction are called ___ Symporters Which of the following describes the concentration of ions when the cell is at rest? The concentration of potassium is higher inside the cell. Which of the following is the driving
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Physical properties of Group II metals Ionization The process of removing an electron from an isolated atom (or an ion) to form a cation. First ionization: M(g) M+(g) + 1e- Second ionization: M+ (g) M2+(g) + 1e- Ease of ionization All the Group II elements have two electrons in their outer shell. They can lose these electrons to form positive ions. e.g. Ca Ca2+ + 2e- In the neutral atoms the electrons are held to the nucleus by the electrostatic attraction
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the dead bodies. I am going to explain what Ions are including Cations and Anions because it is the background information needed to carry out this investigation. An ion is an atom or molecule which the total number of electrons isn’t equal to the total number of protons giving the atom a positive or negative electrical charge. When an atom is attracted to another atom because it has an unequal number of electrons and protons‚ the atom is called an Ion. If the atom has more electrons than protons
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Chapter 2 Chapter 2 is about Molecular level of life/ the chemical component of life. What does chemistry have to do with our life? Chemical aspect of life. Matter: anything in the universe that has weight and occupies space. The weight is called mass. The mass will remain constant regardless of gravity. Can exist in our body in three different forms Three states of matter in our body. * Solid: in our body are organs‚ Bones‚ they will have different shapes. * Liquid: In our body
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