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 reason for this difference in melting points? (3 points) Ionic compounds usually have higher melting points. This is because the atoms of covalent compounds are bound strongly to each other in stable molecules‚ but those molecules are in general not very strongly attracted to other molecules in the compound. On the other hand‚ the atoms in ionic compounds show strong attractions to other ions in their vicinity. http://hyperphysics.phy-astr.gsu.edu/hbase/chemical/bond2.html 2. Do ionic compounds
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found in the nucleus of an atom? Your Answer for Question 3 A and B Comments Correct!! Max Score: 5 Actual Score: 5 Question 4 The component of an atom or molecule that is most important in determining its chemical properties is the Your Answer for Question 4 electron. Comments Correct!! Max Score: 5 Actual Score: 5 Question 5
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This is because the magnesium not only reacted with the oxygen and the nitrogen in the air but also with the porcelain of the crucible. The reason for waiting for the crucible to cool before weighing it was because at higher temperatures‚ the molecules inside are still active‚ causing the weight to be off. During Trial 2‚ the magnesium was not properly burned off and caused the calculations to be off. The magnesium looked as if it had stopped glowing‚ but the inside coil was not completely
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human eye is between 390 to 700nm 3.Explain why “roses are red and Violets are blue Answer human eye can view only the color that is reflected‚ the remaining color in visible spectrum are being absorbed by the plant pigments for energy use. Molecule or Molecular ion | Valence shell Electron pairs | Bonding Electron pairs | Nonbonding Electron pairs | VSEPR Formula | Approx. Bond Angle | Geometric Shape | BrCl3 | 5 | 3 | 2 | AX3E2 | <90o | T-shaped | IF4- | 6 | 4 | 2 | AX4E2
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2.2 2.3 Shapes of molecules and ions 2.3a Electron pair repulsion theory a demonstrate an understanding of the use of electron-pair repulsion theory to interpret and predict the shapes of simple molecules and ions In a chemical species like a molecule or ion‚ pairs of electrons create negative centres that surround the central atom. These electron pairs repel each other and arrange themselves to be as far apart as possible‚ thus minimising repulsion. [pic](source: http://www.mikeblaber.org/oldwine/chm1045/notes/Geometry/VSEPR/Geom02
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(2) The molecular shape of a molecule with the formula AB 2 is … A linear or bent. B linear or trigonal planar. C linear or tetrahedral. D linear or trigonal bipyramidal. (2) The boiling point of CH 4 is much lower than that of HF. Which ONE of the following best explains this difference in boiling points? A HF molecules are more polar than CH 4 molecules. B CH 4 molecules are more polar than HF molecules. C There are hydrogen bonds between HF molecules. D There are dipole-dipole
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does a single chlorine molecule‚ Cl2‚ weigh? a) 5.887 x 10 g b) 1.177 x 10 g c) 35.45 g d) 70.90 g 9. How many grams are there in 0.500 mol of dichlorodifluoromethane‚ CF2 Cl2 ? a) 4.14 x 10 g b) 60.5 g c) 121 g d) 242 g 10. How many moles are there in 1.50 g of ethanol‚ CH3CH2OH? a) 0.0145 mol b) 0.0326 mol c) 30.7 mol d) 69.0 mol 11. How many molecules are there in 5.00 g of FeSO4? a) 5.46 x 10 molecules b) 1.98 x 10 molecules c) 1.83 x 10 molecules d) 4.58 x 10 molecules 12. How many grams
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Current‚ Voltage and Power * Electricity is the flow of electric charge. We can describe the flow of electric charge in several ways. These include the quantities Current‚ Voltage and Power. Current * Current (I) is the rate of flow of Charge Carriers‚ such as electrons. Current is usually thought of as moving in the direction of positive charge‚ so from the positive power supply to the negative. However‚ since in metals it is electrons that carry electric charge‚ the actually flow is opposite
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the universe. * Substances made up of more than one type of atom are called mixtures. * Mixtures are made up of groups of atoms called molecules. * Molecules that are made of one type of atom are called simple molecules. Examples: O3 ‚ N2 ‚ S8 * Molecules that are made of more than one type of atom are called compound molecules.
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