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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The purpose of this experiment was to determine the percent by mass in a hydrated salt‚ as well as to learn to handle laboratory apparatus without touching it. The hydrated salt‚ calcium carbonate‚ was heated with high temperature to release water molecules. Gravimetric analysis was used in this experiment to determine the percent by mass of water in a hydrated salt. The hypothesis of this experiment was accepted on the basis that the percent by mass of volatile water in the hydrated salt would be fewer
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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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pear pieces of a given size. Define osmosis: Osmosis is a net movement of water/ solution molecules from a region of high concentrated area to a region of lower concentrated area through a semi-permeable membrane which lets smaller molecules such as water through but does not allot bigger molecules like glucose to pass through. The molecules will continue to diffuse until the area in which the molecules are found reaches a state of equilibrium (evenly distributed). Hypothesis: In this investigation
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the functional group‚ and the molecular/scientific formula (ie. Methyl group‚ - CH3) 5. Be able to identify all the organic and inorganic molecules that you built in lab. Be ready to identify the models‚ name the molecule‚ and the molecular/scientific formula (ie. ethyl alcohol‚ CH3CH2OH). You should know the difference between organic and inorganic molecules. 6. Be familiar with the biochemical tests performed in lab-including the Millon test‚ Biuret test‚ Benedict’s test‚ Iodine test‚ Grease spot
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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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earliest determinations of the actual dimensions of the molecules‚ whilst physical phenomena observable in liquids have not‚ up to the present‚ served for the calculation of molecular dimensions. The explanation of this doubtless lies in the difficulties‚ hitherto unsurpassable‚ which discourage the development of a molecular kinetic theory of liquids that will extend t b details. It will be shown now in this paper that the size of the molecules of the solute in an undissociated dilute solution
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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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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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