Podcast
Questions and Answers
Which of the following mixtures is most likely to be classified as a colloid?
Which of the following mixtures is most likely to be classified as a colloid?
- Brine (salt in water)
- Muddy water
- Mayonnaise (correct)
- Carbon dioxide
Considering intermolecular forces, what primary interaction explains water beading up on a freshly waxed car surface?
Considering intermolecular forces, what primary interaction explains water beading up on a freshly waxed car surface?
- A combination of cohesion and gravity overcoming adhesion.
- Cohesion, because water molecules are more attracted to each other than to the wax. (correct)
- The hydrophobic nature of the wax repels the water.
- Adhesion, because water is attracted to the wax.
If a reaction vessel feels cold to the touch, what type of reaction is likely occurring within the vessel, and what is the sign of its enthalpy change?
If a reaction vessel feels cold to the touch, what type of reaction is likely occurring within the vessel, and what is the sign of its enthalpy change?
- Exothermic; positive \$\Delta H\$
- Endothermic; negative \$\Delta H\$
- Endothermic; positive \$\Delta H\$ (correct)
- Exothermic; negative \$\Delta H\$
Which of the following is a pure substance that is also an element?
Which of the following is a pure substance that is also an element?
In an exothermic reaction, how does the enthalpy of the reactants compare to the enthalpy of the products, and what happens to the temperature of the surroundings?
In an exothermic reaction, how does the enthalpy of the reactants compare to the enthalpy of the products, and what happens to the temperature of the surroundings?
Which of the following is most likely to be a solution?
Which of the following is most likely to be a solution?
Why is soda classified as a solution, while muddy water is classified as a suspension?
Why is soda classified as a solution, while muddy water is classified as a suspension?
Which of the following scenarios best illustrates the principle of adhesion?
Which of the following scenarios best illustrates the principle of adhesion?
Which of the following changes would indicate an endothermic chemical reaction?
Which of the following changes would indicate an endothermic chemical reaction?
If a scientist observes that the enthalpy of the products in a reaction is significantly lower than the enthalpy of the reactants, what can they conclude about the reaction?
If a scientist observes that the enthalpy of the products in a reaction is significantly lower than the enthalpy of the reactants, what can they conclude about the reaction?
Flashcards
Cohesion Definition
Cohesion Definition
Intermolecular attraction between like molecules.
Adhesion Definition
Adhesion Definition
Attraction between unlike molecules.
Endothermic Reaction
Endothermic Reaction
Chemical reactions that absorb heat energy from the surroundings, leading to a decrease in temperature. Reactant enthalpy is lower than product enthalpy, resulting in a positive change in enthalpy (ΔH).
Exothermic Reaction
Exothermic Reaction
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Suspension
Suspension
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Colloid
Colloid
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Solution
Solution
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Pure Substances
Pure Substances
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Study Notes
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Suspensions and colloids are heterogeneous mixtures.
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Solutions are homogeneous mixtures.
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Pure substances can be either compounds or elements.
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Antacids are suspensions.
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Diamonds are pure substances.
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Muddy water is a suspension.
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Honey is a colloid.
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Ink is a suspension.
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Brine is a solution.
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Mayonnaise is a colloid.
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Cement mix is a suspension.
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Carbon dioxide is a pure substance.
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Cream is a colloid.
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Soda is a solution.
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Quartz is a pure substance.
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River water is a suspension.
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Ice cream is a colloid.
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Air is a solution.
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Alloys are solutions.
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Jelly is a colloid.
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Soup is a suspension.
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Water is a pure substance.
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Iron is a pure substance.
Properties of Liquids
- Cohesion is the attraction between like molecules.
- Adhesion is the attraction between unlike molecules.
Endothermic Reactions
- Endothermic reactions absorb heat energy from the surroundings.
- Temperature decreases as the reaction progresses.
- Reactants have lower enthalpy than products.
- The change in enthalpy (ΔH) has a positive value.
- Energy must be added to the system.
Exothermic Reactions
- Exothermic reactions release heat energy to the surroundings.
- Temperature increases as the reaction progresses.
- Reactants have higher enthalpy than products.
- The change in enthalpy (ΔH) has a negative value.
- Energy is released from the system.
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