1. Polar molecules A. have bonds with an unequal distribution of electric charge. B. must form ions in water solution. C. have bonds with an equal distribution of electrical charge. D. have bonds with an overall negative charge. E. have bonds with an overall positive charge. Correct See Section 2.2: How Do Atoms Bond to Form Molecules? Points Earned: 1/1 Correct Answer: A Your Response: A 2. Hydrocarbons are _______ and _______‚ whereas salts are _______ and _______. A. nonpolar;
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the ion. The ionic charge of an atom can be determined by consulting a periodic table. Generally‚ metals on the left will be positive and non-metals on the right will negative. The periodic table below shows the general trend for ionic charges 3) Hydrogen is either a +1 (with nonmetals) or a -1 (with metals) Oxygen is a -2 except when in a peroxide (H2 02) then it will be a -1 4) In compounds‚ all other atoms are given an oxidation number so that the sum of the oxidation number on all atoms in the
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Substances that neutralize acids are called alkalis. An acid is a substance that forms hydrogen ions (H+ ) when placed in water. It can also be described as a proton donor as it provides H+ ions. An example of an acid is hydrochloric acid (HCl)‚ Sulphuric acid (H2SO4) etc. An alkali is a soluble base and forms hydroxyl ions (OH-) when placed in water. It can be called a proton acceptor and will accept hydrogen ions to form H2O. An example of an alkali is Sodium Hydroxide (NaOH). Neutralization
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We breathe it and burn fuels in it. Plants use it to grow. It is all around us but we hardly notice it except when the wind blows. Aircraft and birds fly in it. More than one hundred kilometres above us‚ satellites look down through it. In the apparatus shown here‚ air is passed from one syringe to the other while the copper in the tube is heated. The oxygen from the air joins with the copper‚ so the volume of the air gets smaller. The amount of oxygen in the air is the difference in
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fine magnesium powder tends to burn rather more slowly than a strip of magnesium ribbon‚ for example. Imagine a reaction between magnesium metal and a dilute acid like hydrochloric acid. The reaction involves collision between magnesium atoms and hydrogen ions. How does surface area affect a chemical reaction? If one of the reactants is a solid‚ the surface area of the solid will affect how fast the reaction goes. This is because the two types of molecule can only bump into each other at the liquid
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chemical reaction are Exothermic‚ for example when a gas is formed when Copper II Chloride and Aluminum are mixed‚ and Endothermic‚ for example when copper II Hydroxide is heated. There are many substances used in this experiment‚ the elements are Hydrogen Gas‚ Aluminum‚ and solid Copper‚ the compounds are Copper II Nitrate‚ Sodium Hydroxide‚ Copper II Hydroxide‚ Copper II Oxide‚ Hydrochloric Acid‚ Sodium Nitrate‚
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Activity 1.7.2 Synthesis of Esters Purpose- the Purpose of this lab is to synthesize Esters by combining Carboxylic Acid and Alcohols. In this lab we will synthesize and then detect the odour of Esters formed. Materials- Materials that will be used in this lab are as follows:- Ethanol 7. Acetic Acid Eye Protection 11. Test tube rack Procedure- Prepare a hot-water by half filling a 500-mL beaker with water and heating it carefully on a hot plate until it comes to a gentle
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Valuable Experience Gained During the Training Period The valuable experience that I gained during the training is when we are in the furnace of the boiler where the combustion takes place. The furnace is a internal parts of the boiler so we are taking the advantage to see what’s inside the boiler. We saw the generating tubes‚ bunker fuel injector‚ grates that we need to fix because of mis-alignment of the grates base. Grate is use for de ashing to avoid clogging up of the boiler. The second
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John Dalton was an English chemist‚ physicist‚ and meteorologist. Dalton was born in 1766. He is best known for his work in color blindness‚ and of course‚ his Atomic Theory. His theory gave us an idea about what the universe is really made up of‚ and he paved the way for many more important scientific discoveries after he died in 1844. His theory was simple: He stated that all matter is made of atoms. He based his theory on two laws: the law of conservation of mass and the law of constant composition
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adhesion which is the attraction of molecules in different substances. There are two sides to a pH scale‚ base and acid. Acids are a compound of substances that release hydrogen ions in a solution. Acids taste sour‚ are corrosive to metal‚ and it turns litmus paper red. Bases on the other hand are compounds that removes hydrogen ions in a solution. Bases taste bitter‚ makes good cleaning supplies(soap‚ detergent‚ bleach‚ Windex) and turns litmus paper blue. A pH scale gives a numerical value to
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