Chemistry Reactions Quiz

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Chemical reaction indicators

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Jeivy gwen Cate

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Chemistry Reactions Quiz


Chemistry Reactions QuizVersión en línea Chemical reaction indicators por Jeivy gwen Cate 1 Key Indicators of chemical reaction. 1. change-may indicate that the composition of the substance has been cg=hanged, forming new elements or compound 2. Precipitation -the formation of an insoluble solid called a precipitate during the chemical reaction 3. Production of bubbles -may indicate that gaseous products are formed and released during a reaction Note: not all bubbling indicates a chemical reaction 4. Temperature changes- occur due to energy being released or absorbed when chemical bond a Temperature changes- occur due to energy being released or absorbed when chemical bonds or break or form b Production of bubbles -may indicate that gaseous products are formed and released during a reaction c Change may indicate that the composition of the substance has been changed, forming new elements or compound d Precipitation -the formation of an insoluble solid called a precipitate during the chemical reaction 2 ACID, BASE AND SALT a Is responsible for the sour taste of foods like calamansi b Changes blue litmus paper to red c Decreases the pH level of a solution below 7 d A substance that produces hydrogen ions (H+) when dissolved in water 3 Types of Chemical Reactions A chemical reaction is a process in which one or more substances are transformed into new substances with different properties. Scientists classify chemical reactions according to the way atoms are rearranged during the reaction. Combination (Synthesis) Reaction A combination reaction occurs when two or more reactants combine to form a single product. General Equation A + B → AB Example: 2H₂ + O₂ → 2H₂O Hydrogen combines with oxygen to produce water. a Single Replacement Reaction b Combination (Synthesis) Reaction c Double Replacement Reaction d Decomposition Reaction 4 Decomposition Reaction A decomposition reaction occurs when one compound breaks down into two or more simpler substances. These reactions usually require heat, electricity, or light. General Equation: AB → A + B Example: 2H₂O₂ → 2H₂O + O₂ Hydrogen peroxide decomposes into water and oxygen. a Single Replacement Reaction b Combination (Synthesis) Reaction c Double Replacement Reaction d Decomposition Reaction 5 Single Replacement Reaction A single replacement reaction occurs when one element replaces another element in a compound. The more reactive element replaces the less reactive one. General Equation: A + BC → AC + B Example: Zn + CuSO₄ → ZnSO₄ + Cu a Combination (Synthesis) Reaction b Double Replacement Reaction c Single Replacement Reaction d Decomposition Reaction 6 Double Replacement Reaction A double replacement reaction occurs when the positive ions of two compounds exchange partners to form two new compounds. General Equation: AB + CD → AD + CB Example: AgNO₃ + NaCl → AgCl + NaNO₃ Silver nitrate reacts with sodium chloride to form a white precipitate of silver chloride a Decomposition Reaction b Double Replacement Reaction c Single Replacement Reaction d Combination (Synthesis) Reaction

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Chemistry Reactions Quiz

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Chemistry Reactions QuizVersión en línea

por Jeivy gwen Cate

ACID, BASE AND SALT

Single Replacement Reaction A single replacement reaction occurs when one element replaces another element in a compound. The more reactive element replaces the less reactive one. General Equation: A + BC → AC + B Example: Zn + CuSO₄ → ZnSO₄ + Cu