1018730
Questão 1
Questão
The graph on the left shows the maximum dissolved oxygen concentration in water as a function of temperature at normal atmospheric pressure. What is the volume of O2 that can dissolve n 10.0L of water at \(25\,^{\circ}\)C and normal atmospheric pressure?
Responda
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62.0 mL
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63.5 mL
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80.0 mL
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124 mL
Questão 2
Questão
Bromine, \(Br_2\), dissolves in unsaturated hydrocarbons and reacts immediately. Which of the following is the best description of this process?
Image:
bromine (image/jpg)
Responda
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Bromine is polar and reacts by adding bromine atoms across the double bond
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Bromine is polar and reacts by substituting hydrogen atoms with bromine atoms
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Bromine is non-polar and reacts by substituting hydrogen atoms with bromine atoms
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Bromine is non-polar and reacts by adding bromine atoms across the double bond
Questão 3
Responda
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Antacid tablets, baking soda, laundry detergents
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Blood, oven cleaner, sea water
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Milk, tea, drain cleaner
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Vinegar, wine, aspirin
Questão 4
Questão
What flame colour is produced by barium ions in a flame test?
Image:
bunsen_burner (image/jpg)
Responda
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Red
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Blue
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Green
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Orange
Questão 5
Questão
In a fermentation experiment, 6.50g of glucose was completely converted to ethanol and carbon dioxide. What is the mass of carbon dioxide produced?
Image:
glucose (image/jpg)
Responda
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1.59g
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3.18g
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9.53g
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13.0g
Questão 6
Questão
Which of the following cations can be identified using a flame test?
Image:
flame_test (image/jpg)
Responda
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\(Al^3+\)
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\(Cu^2+\)
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\(Mg^2+\)
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\(Zn^2+\)
Questão 7
Questão
A group of students produced a red solution by boiling red cabbage leaves in water. When dilute sodium hydroxide was added to the solution, it turned purple. When dilute hydrochloric acid was added to the red solution, no colour change occurred. Which of these substances, when added, is most likely to cause the red solution to change colour?
Image:
red_cabbage (image/jpg)
Responda
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Cleaning solution containing ammonia
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Concentrated hydrochloric acid
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Orange juice
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Vinegar
Questão 8
Questão
An understanding of Le Chatelier's principle is important in the chemical industry. Which prediction can be made using this principle?
Image:
le_chatelier (image/jpg)
Responda
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The identity of products of a chemical reaction
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The effects of change in temperature on the rates of reactions
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The effects of catalysts on the position of equilibrium reactions
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The effect of changes in the concentration of chemical substances in equilibrium
Questão 9
Questão
What did the Bronstead-Lowry definition of acids identify that made it a significant improvement over earlier definitions?
Image:
chem_def (image/jpg)
Responda
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Acids contain hydrogen
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Acids contain proton donors
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Acids contain oxygen
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Acids are electron-pair acceptors
Questão 10
Responda
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Allotropes
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Conjugates
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Isomers
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Isotopes
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