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Bella S1

S1 Chemical Reactions

QuestionAnswer
Name 3 signs of a Chemical reaction. New substance formed Colour change Gas production Energy produced (heat or light)
Name 4 variables that can affect the rate of a chemical reaction. Particle size Temperature Concentration of reactants presence of catalysts or Enzymes
Name a catalyst. Manganese dioxide Platinum
Where are enzymes produced? Inside living cells
What do enzymes or catalysts do They speed up chemical reactions
What are Physical changes? Changes of state (solid to liquid to gas), no new substance formed
What are Chemical changes? When a new substance is formed.
Is burning paper a chemical or physical change? Chemical change
Is dissolving sugar a chemical or physical change? Physical Change
Are Chemical changes easily reversed? NO
Are Physical changes easily reversed? YES
Is baking a cake a chemical or physical change? Chemical change
Is boiling water a chemical or physical change? Physical change
Is neutralisation a chemical or physical change? Chemical
Are fireworks exploding a chemical or physical change? Chemical
Is ice melting a chemical or physical change? Physical
What range of pH's identify a liquid as an acid? 1 to 6
Name an everyday(household) acid. Coke (any fizzy juice), vinegar, ketchup, milk, tea, coffee, orange juice (any citrus juice).
Name a laboratory acid. Hydrochloric ACID Nitric ACID Sulfuric ACID Carbonic ACID
What can be used to measure pH? pH paper Universal indicator pH meter
What pH is a neutral solution? pH7
Name a neutral solution. Water, salt water, sugar solution
What colour does pH paper turn in a neutral solution? Green
What colour does pH paper turn in a very Acidic solution? Red
What colour does pH paper turn in a very Alkaline solution? Purple
Name an everyday (household) Alkali Soap, toothpaste, oven cleaner, bleach, ammonia solution, indigestion tablets.
Name a laboratory Alkali Sodium HYDROXIDE, Calcium HYDROXIDE, Lithium HYDROXIDE, Potassium HYDROXIDE (any metal then HYDROXIDE)
What is always formed in a neutralisation reaction? A salt AND water
Give an everyday example of everyday neutralisation toothpaste on a bee sting vinegar on a bee sting indigestion tablets swallowed for heart burn Lime added to acidic soil
Name the salt formed when Sodium hydroxide is neutralised by Nitric acid Sodium nitrate
Name the salt formed when Calcium hydroxide is neutralised by Sulfuric acid. Calcium Sulfate
Name the salt formed when Hydrochloric acid is neutralised by Magnesium hydroxide. Magnesium chloride
What is an enzyme? A biological catalyst
Where are enzymes made? Inside living cells.
What is a variable in a chemical reaction? A factor that can affect the rate of a chemical reaction.
Created by: nscobie
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