Chemical changes

Questão	Responda
What is a Universal indicator?	A dye which determines the ph of a substance
What is a Ph Probe?	pH probes are devices used to measure the acidity or alkalinity of a substance accuratley
Ion produced by acid?	H+
Word equation for neutralization between acid and alkali?	Acid + Alkali = Salt + Water
What is a Base?	A substance that can neutralize the acid by reacting with hydrogen ions
Ionic equation for a neutralization reaction in terms of hydrogen ions and hydroxide ions?	(H+) + (OH–) --> H2O
Why is a Burette useful for identifying the endpoint of a titration?	A Burette helps add the acid into the alkali drop by drop which will help determine the endpoint more accurately.
What should you do to increase accuracy of a Titration?	Repeat the experiment to spot anomalies
Strong acid	Completely ionizes, More amounts of H+ ions
Weak acid	Partially ionizes, Less amounts of H+ ions
To increase the Ph of an acid you can...	Add water to the solution, add less acidic solutions.
What reaction occurs when acid reacts with alkali?	Neutalization
Metal Carbonate + Dilute acid -->	salt, carbon dioxide and water.
Carbon dioxide can be identified in a reaction between a Metal Carbonate + Dilute acid by?	Fizzing
Word equation for Sulfuric acid and Lithium hydroxide	Lithium sulfate + water
Balanced Symbol equation for Sulfuric acid + Lithium Hydroxide	H2SO4 + 2 LiOH --> LiSO4 + 2 H2O
Difference in the products of Sulfuric acid + Lithium Carbonate and Sulfuric acid + Lithium Hydroxide	Sulfuric acid + Lithium Carbonate produces Salt + water + Carbon Dioxide while Sulfuric acid + Lithium Hydroxide produces Salt + water
Word equation for Magnesium + Hydrochloric acid	Magnesium + Hydrochloric acid --> Magnesium Chloride + Hydrogen
What does the reaction of Magnesium with Hydrochloric acid produce?	Positive Magnesium ions
Why does Iron react less vigorously with hydrochloric acid than Magnesium?	Magnesium is higher up in the reactivity series
Metal + Water -->	Metal + Water --> Metal Hydroxide + Hydrogen
Symbol equation for Calcium and water	Ca + 2 H2O --> CaOH2 + H2
Suggest a Metal that reacts more vigorously with water than calcium?	Lithium/Sodium/Potassium as they are higher in the reactivity series.
Why are most metals in the Earth found as compounds?	Many metals can react with other elements to form compounds
Why can Magnesium not be extracted using Carbon?	Magnesium is more reactive than Carbon
Symbol equation for Iron (III) oxide Fe2 O3	2 Fe2O3 + 3C --> 4 Fe + 3 CO2
How can you tell if something has been oxidized or reduced in a reaction?	If it has gained oxygen or if it has lost oxygen
Why is Magnesium Extraction very costly compared with Iron extraction?	Magnesium Extraction would have high energy costs to provide the high temperature needed while Iron doesn't need to be continuously heated.
Reduction in the terms of electron transfer?	Reduction is the gain of Electrons
Oxidation in terms of electron transfer?	Oxidation is the Loss of Electrons
Does Hydrogen lose or gain Electrons? Zn + 2HCl --> ZnCl + H2	Hydrogen Gains electrons as it has gone back to being a diatomic meaning it has been reduced.
Write an Ionic equation for this reaction Mg + FeCl --> MgCl + Fe	Mg + Fe(2+) --> Mg(2+) + Fe
What is an electrolyte?	A liquid that can conduct Electricity
Word equation for Lead Bromide	Lead Bromide --> Lead + Bromine Bromine doesn't change into oxygen as it is a Halide (group 7 element)
What charge does a Cathode have?	Negative (Cations)
What charge does a Anode have?	Positive (Anions)
What Ions move towards the Anode?	Negatively Charged Ions such as Br(-)
What reaction happens at the anode?	Oxidation
What reaction happens at the Cathode?	Reduction
Why does Lead Bromide Have to Molten?	So that the Ions can Move to the Electrode
What is the purpose of Mixing Cryolite with Aluminum Oxide?	To reduce the melting point of the electrolyte
Why do the Electrodes need to be replaced often?	This is because the Carbon in the electrode reacts with the oxygen to form Carbon Dioxide, so they degrade over time.
What does Aqueous mean?	Made from or in Water
Ions present in an Aqueous solution of Iron Chloride	Iron Ions, Hydroxide Ions, Chloride Ions, Hydrogen Ions
What are the products at each Electrode for Iron Chloride in Electrolysis?	Cathode- Hydrogen Discharged Anode- Chlorine Discharged
What des inert mean?	A Substance that is not Chemically Reactive
What is produced if a Metal is more reactive than Hydrogen?	Hydrogen
What is produced if a Metal is Less reactive than Hydrogen?	The metal Itself for example Copper
What happens when Potassium Nitrate solution is electrolyzed?	Potassium isn't discharged as Potassium is more reactive than hydrogen instead Hydrogen is produced. Nitrate isn't produced as there isn't a Halide Ion so oxygen and water is discharged.
What is the 2 Half equations that occurs when Water is electrolyzed?	Cathode: 2H(+) + 2e(-) --> H2 Anode: 4OH(-) - 4e(-) --> O2 + 2 H2O

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	Criado por Henok Joseph 9 meses atrás