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Add 6 M NaOH and smell cautiously. The odor of ammonia indicates the presence of ammonium ions. If you do not smell ammonia, warm the beaker and again smell the emitted vapors. The liberated ammonia will also change the color of a moistened strip of red litmus paper held at the entrance of the test tube. NH 4 + (aq) + OH-(aq) → NH 3 (g) + H 2 O Discovery ftp
Chemical Changes: A chemical change occurs when the atoms making up matter rearrange to form a new substance with new properties. This usually occurs during a chemical reaction. Evidence of a chemical change: Evidence What You Might Observe production of a gas bubbles foaming odor fizzing smoke color change *not all color changes are chemical!!

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Chemical Reactions – Thermodynamics has two major aspects: • Conservation of energy (1st law) • Direction of processes (2nd law) 20.1 The 2nd Law of Thermodynamics • Spontaneous changes – occur without any external influence Examples: Aging, rusting, heat transfer from hot to cold, expansion of gases into vacuum, etc.

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Add 6 M NaOH and smell cautiously. The odor of ammonia indicates the presence of ammonium ions. If you do not smell ammonia, warm the beaker and again smell the emitted vapors. The liberated ammonia will also change the color of a moistened strip of red litmus paper held at the entrance of the test tube. NH 4 + (aq) + OH-(aq) → NH 3 (g) + H 2 O

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According to law of conservation of mass, “Matter can neither be created nor destroyed in a chemical reaction Therefore the chemical equations are balanced to satisfy the law of conservation of mass in chemical reactions. (b) Al 2 O 3 + 2NaOH → 2NaAlO 2 + H 2 O. Question 5. Write balanced chemical equations for the following reactions:

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In a chemical reaction, the chemical bonds in the reactant molecules are broken. New bonds are formed in the product molecules. An example would be the combustion reaction between methane (CH 4) oxygen (O 2) (the reactants) that produces carbon dioxide (CO 2) and water (H 2 0) molecules (the products). Bonds are broken in the methane and oxygen ...

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Chemical change occurs when the atoms that make up one or more reactants rearrange themselves in such a way that new substances, called products, are formed. The reactants and products are the components of the chemical reaction system. A given chemical reaction system is defined by a balanced net chemical equation which is conventionally ...

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Jan 24, 2020 · S N 2 reactions are fast. S N 1 - Rate depends only on the concentration of the haloalkane. The carbocation forms much slower than it reacts with other molecules. This makes S N 1 reactions slow. Role of solvent: S N 2 - Polar aprotic solvents favored. Examples: Acetone, THF (an ether), dimethyl sulfoxide, n,n-dimethylformamide ...

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•Chemical reactions - which rearrange the atoms to form different molecules (for example, molecules of gaseous hydrogen can be combined with molecules of gaseous oxygen to form liquid water). • Nuclear reactions - which rearrange and possibly transform subatomic particles to create different atoms (for example, fusion in the Sun's core, in ...

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Mar 03, 2016 · Odor is generated when substances change composition. A very common example is rotting of eggs, that have a very different odor from fresh eggs. During the process of rotting, chemical reactions...

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Add 6 M NaOH and smell cautiously. The odor of ammonia indicates the presence of ammonium ions. If you do not smell ammonia, warm the beaker and again smell the emitted vapors. The liberated ammonia will also change the color of a moistened strip of red litmus paper held at the entrance of the test tube. NH 4 + (aq) + OH-(aq) → NH 3 (g) + H 2 O

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May 23, 2011 · A person’s ability to smell can vary, depending on genetic factors or current health conditions. The second experiment demonstrates the Maillard reaction, in which new compounds are created by the chemical reaction between the amino acid powder and glucose in the corn syrup. These new compounds create a variety of odor molecules.

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