1. On analysis‚ a compound with molar mass 60 g mol–1 was found to contain 12 g of carbon‚ 2 g of hydrogen‚ and 16 g of oxygen. What is the molecular formula of the compound? A. CH2O B. CH4O C. C2H4O D. C2H4O2 2. What is the total number of atoms in 0.20 mol of propanone‚ CH3COCH3? a. 1.2×1022 b. 6.0×102 C. 1.2×1024 D. 6.0×1024 Assuming complete reaction‚ what volume of 0.200 mol dm–3 potassium hydroxide solution (KOH(aq))‚ is required to neutralize 25.0 cm3 of 0.200 mol dm–3 aqueous
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with that atom in a compound. An element’s electronegativity value and other properties affect its oxidation state in different compounds. Decomposition: Some compounds decompose into more than one different element or compound as bonds are broken. Hydrogen peroxide (H2O2)‚ a chemical you may have around your house‚ is stored in a dark container to slow down decomposition‚ which can be caused by heat and light. clues that can indicate that a chemical change has occurred include: production of flames
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Chemistry and Matter Rich McConnell‚ CH-201 Grantham University Chemistry and Matter 1. A scientist who is trying to make an insecticide that is more toxic to mosquitoes than to humans would be involved in ________. 1. Basic research 2. Applied research 3. Technology 4. Serendipity 2. How is chemistry defined? Science can be looked at like at tree‚ within this tree there are different branches one of which is Chemistry which studies composition and properties of matter and the changes they go through
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products. This process is summarized by a chemical equation. In the Balancing Chemical Equations Gizmo™‚ look at the floating molecules below the initial reaction: H2 + O2 H2O. 1. How many atoms are in a hydrogen molecule (H2)? 2 2. How many atoms are in an oxygen molecule (O2)? 2 3. How many hydrogen and oxygen atoms are in a water molecule (H2O)? 2 H‚ 1 O 4. In general‚ what does a subscript (such as the “2” in H2) tell you about the molecule? The subscript tells you how many atoms of each element
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Oxidation occurs by: -The loss of electrons -The gaining of oxygen‚ -The loss of hydrogen -An increase in the oxidation state Reduction occurs by: -The gaining of electrons -The loss of oxygen -The gaining of hydrogen -A decrease in the oxidation state Objective: To find the redox reactions between a metal and dilute acid
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(3) Answer the questions related to each chemical formula. O2 CO2 5 H2 What element does the O represent? ___________________ How many atoms of each element are in the formula shown? C = ______ O = ______ How many atoms of Hydrogen are in this formula as shown? ______ 2C2H6 2Na2SO4 How many atoms each element are in the formula shown? C = ______ H = ______ How many atoms each element are in the formula shown? Na = ______ S = ______ O = ______ Part B: Label
Free Oxygen Nitrogen Methane
Chemical Reactions & Equations CHEMICAL REACTION : In a reaction when the original state of the particle changes and it cannot be reversed by simple physical means‚ this type of reaction is known as chemical reaction. Example :- Fermentation of grapes‚ burning of wood etc. In this reaction we have seen that after burning of wood‚ coal is formed and we cannot make wood from coal. PHYSICAL REACTION : In a reaction when original state of the particle can be recovered by any means then this type of
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mole ratio. Introduction The objective of the Get Charged Up lab was to determine the charge on a metal ion reacting with HCl by determine the mole ratio in a reaction by determining the amount of excess reactant‚ amount of product‚ and amount of hydrogen gas produced as well as finding the best research method to determine the charge. To accomplish this‚ three different methods were used. Titration was used to react NaOH with HCl to determine the amount of H+ left over after the reaction is complete
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beam by the pole. T = 392 N‚ H = 339 N‚ V = 0 6. A water molecule consists of an oxygen atom with two hydrogen atoms bound to it as shown in Figure 5. The bonds are 0.100 nm in length‚ and the angle between the two bonds is 106°. Use the coordinate axes shown‚ and determine the location of the center of gravity of the molecule. Take the mass of an oxygen atom to be 16 times the mass of a hydrogen atom. x = 6.69 x 10-3 mm‚ y = 0 7. A constant torque
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metal strip was placed in the lead(II) nitrate‚ magnesium sulfate and dilute(3M) sulfuric acid. Overall‚ putting these different strips of metal into different solutions will help determine the reactivity of copper‚ lead‚ zinc‚ magnesium‚ silver and hydrogen.
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