An ion is an atom or a molecule with a positive or a negative charge due to the loss or gain of one or more electrons. Ionic solids are salts (such as NaCl) that are held together by a strong force of attraction between ions of opposite charge. Molecules are the smallest physical units of an element or a (chemical) compound. Ionic solids are also known as salts because salts are ionic compounds that are formed from a reaction between an acid and a base. Hydrates are inorganic salts which contain
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number of unit for counting is always constant. a. What is a mole? mole (mol): the SI unit used to measure the amount of a substance‚ number of representative particles. representative particle: any kind of particle such as atoms‚ molecules‚ formula units‚ electrons‚ or ions. Avogadro’s number: 6.022 136 7 x 10²³‚ volume of one mole of a gas determined by Amedeo Avagadro in 1811. B. Converting Moles to Particles and Partciles to Moles number of moles x 6.02 x 10²³ representative
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The Effects of Osmosis and Diffusion The experimentation of last week’s lab was in order to test the many effects of diffusion and osmosis amongst four experiments. One such experiment was testing the effects of molecular weight on diffusion in relation to the use of Agar. The methods performed included the use of two acids‚ HCl and acetic acid. Both acids were placed into an Agar-filled dish and‚ over increments of 15 minutes‚ data collection was taken based off the diffusion rate and the
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reaction wherein the reactant entities are given on the left-hand side and the product entities on the right-hand side. A Coefficient is the number that normally appears at the beginning of a term in a chemical equation. It indicates the number of molecules or atoms that were involved in the chemical reaction. 1. H2 + Br2 -----> 2HBr 2. Potassium Chlorate ----> Potassium Chloride + Oxygen = KClO3 ------> KCl + O2 KClO3 ------> KCl + O2 Balanced = 2KClO3 ------> 2KCl + 3O2 3. FeCl3 + 3NaOH
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is the monomethyl ether of hydroquinone. Another inhibitor that prevents the dimethylcrylate groups on the bis-GMA from polymerizing spontaneously is the use of butylated hydroxytoluene. In order for the matrix to be condensed‚ inorganic filler molecules are added to improve the properties of this organic matrix. The properties of the matrix are affected by the percentage of filler because there will be less room within the matrix for the polymer to shift or crack. With the addition of the filler
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WORKSHEET (Chemistry IB) 1. How many molecules are present in 27.0 g of distilled water? A. 2.7 x 1024 B. 1.5 C. 9.0 x 1023 D. 4.5 2. How many moles of carbon dioxide will be formed when 32.0 g of methane‚ CH4‚ burns completely in oxygen? A. 1.0 B. 2.0 C. 4.0 D. 8.0 3. How many oxygen atoms are present in 0.5 mole of pentahydrated copper(II) sulfate‚ CuSO4.5H2O? A. 2.5 B. 4.5 C. 3.0 x 1023 D. 2.7 x 1024 4. What is the total number of atoms in 3.0 molecules of propanone‚ CH3COCH3? A. 10 B. 30 C.
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SUNDAY 07th APRIL‚ 2013) PART B – CHEMISTRY Which of the following complex species is not expected to exhibit optical isomerism ? (1) [Co(en)3]3+ (2) [Co(en)2 Cl 2]+ (3) [Co(NH3)3 Cl3] (4) [Co(en) (NH3)2Cl2]+ Ans. (3) 32. Which one of the following molecules is expected to exhibit diamagnetic behaviour ? (2) N2 (1) C2 (3) O2 (4) S2 Ans. (2) 33. A solution of (–) –1–chloro–1–phenylethane in toluene racemises slowly in the presence of a small amount of SbCl5‚ due to the formation of :(1) carbanion (2)
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to predict properties of elements. * Recognize different blocks in the Periodic table. * Distinguish between group and period in relation to electron arrangement of atoms. * Know that elements are represented by symbols and form molecules with fixed atomicity Periodic trends. * Describe the change from metallic to non-metallic character
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Title: Benedict ’s test for Reducing Sugars Testable Question: Are all carbohydrates reducing sugars? Hypothesis: If the carbohydrate contains available ketone or aldehyde molecules then they are reducing sugars. Variables: a. Independent: Function groups react w/ reagent b. Dependent: Color change (red‚ orange‚ yellow) Control: Water Materials: - 4 mL of each solution (Water‚ Starch‚ Glucose‚ Maltose‚ Sucrose‚ Onion Juice‚ Potato slice‚ Milk) - 8 test tubes
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The basic building block of most carbohydrate compounds is the molecule glucose. Using the Dehydration Synthesis Gizmo™‚ you will learn about the structure of a glucose molecule and how glucose molecules can be joined together to make larger carbohydrate molecules. To begin‚ select the CREATE GLUCOSE tab. 1. Look at the chemical formula for glucose. How many carbon (C)‚ hydrogen (H)‚ and oxygen (O) atoms are found in a molecule of glucose? C:6 H:12 O:6 2. Turn on Show chemical structure
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