Rates of Reaction Teacher Demo Quiz
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Questions and Answers

What is required for a chemical reaction to occur according to collision theory?

  • Reactant particles need to be mixed thoroughly.
  • Reactant particles must be in solid form.
  • Reactant particles must collide with sufficient energy. (correct)
  • Reactant particles must be heated above 100°C.

    • How does increasing the surface area of a solid reactant affect the reaction rate?

  • It makes the reaction slower due to increased complexity.
  • It increases the reaction rate by exposing more particles to collisions. (correct)
  • It decreases the reaction rate by limiting collisions.
  • It has no effect on the reaction rate.

    • What role does a catalyst play in a chemical reaction?

  • It increases the rate of reaction without being consumed. (correct)
  • It is consumed during the reaction.
  • It alters the products formed in the reaction.
  • It slows down the reaction process.

    • What is being measured in the teacher demonstration involving sodium thiosulfate and acid?

    <p>The time taken for the solution to become opaque. (C)</p> Signup and view all the answers

    Which factor does NOT affect the rate of a chemical reaction?

    <p>Size of the reaction vessel. (A)</p> Signup and view all the answers

    Which food group primarily provides energy?

    <p>Lipids (fats and oils) (B)</p> Signup and view all the answers

    What is the main function of proteins in the diet?

    <p>Repairs damaged tissues and builds new cells (B)</p> Signup and view all the answers

    Which of the following is a source of vitamins?

    <p>Fruit and vegetables (D)</p> Signup and view all the answers

    What role does fibre play in the digestive system?

    <p>Aids in preventing constipation (C)</p> Signup and view all the answers

    Which essential mineral is crucial for healthy blood?

    <p>Iron (A)</p> Signup and view all the answers

    What was the independent variable in the experiment?

    <p>The temperature of the reactants (D)</p> Signup and view all the answers

    What was the dependent variable measured in the experiment?

    <p>The time taken for the reaction to occur (B)</p> Signup and view all the answers

    How was the experiment designed to ensure fairness?

    <p>By using the same volume and concentration of reactants (B)</p> Signup and view all the answers

    What is a method to ensure reliable results in an experiment?

    <p>Repeat the experiment and find an average (B)</p> Signup and view all the answers

    What conclusion can be drawn about the relationship between temperature and reaction rate?

    <p>Higher temperatures increase the reaction rate (B)</p> Signup and view all the answers

    What is the primary function of amylase in the digestive process?

    <p>Breaks down starch into sugar (A)</p> Signup and view all the answers

    Which enzyme would be involved in breaking down proteins during digestion?

    <p>Protease (B)</p> Signup and view all the answers

    What role do enzymes play in chemical digestion?

    <p>They speed up the breakdown of food molecules (B)</p> Signup and view all the answers

    Which of the following statements is true about lipase?

    <p>It breaks down fats into fatty acids and glycerol (B)</p> Signup and view all the answers

    What happens to food that cannot be digested in the small intestine?

    <p>It enters the large intestine and is eliminated (D)</p> Signup and view all the answers

    What color change indicates a large amount of sugar during a food test?

    <p>Red color change (B)</p> Signup and view all the answers

    Which organ is responsible for producing bile?

    <p>Liver (A)</p> Signup and view all the answers

    What color change occurs when starch is present in a food test?

    <p>Blue-black color change (A)</p> Signup and view all the answers

    What process allows food to move from the mouth to the stomach through the esophagus?

    <p>Peristalsis (C)</p> Signup and view all the answers

    Which of the following statements about saliva is true?

    <p>It helps in the digestion process. (A)</p> Signup and view all the answers

    What condition is associated with a deficiency of Vitamin C?

    <p>Scurvy (A)</p> Signup and view all the answers

    Which of the following diseases is related to a deficiency in Vitamin D?

    <p>Rickets (A)</p> Signup and view all the answers

    What does BMI stand for in the context of health assessments?

    <p>Body Mass Index (C)</p> Signup and view all the answers

    Which symptom is commonly associated with anemia due to iron deficiency?

    <p>Lack of energy (D)</p> Signup and view all the answers

    What can malnutrition lead to in terms of health conditions?

    <p>Heart disease (A)</p> Signup and view all the answers

    How is total stopping distance calculated?

    <p>Thinking Distance + Breaking Distance (A)</p> Signup and view all the answers

    Which nutrient is primarily responsible for protecting internal organs?

    <p>Lipids (A)</p> Signup and view all the answers

    What is the formula to calculate speed?

    <p>Speed = Distance ÷ Time (D)</p> Signup and view all the answers

    Which mineral is essential for transporting oxygen in the body?

    <p>Iron (A)</p> Signup and view all the answers

    What is the main function of water in the body?

    <p>Needed for hydration (D)</p> Signup and view all the answers

    What is the correct equation for calculating average speed?

    <p>Average speed = total distance / total time (A)</p> Signup and view all the answers

    What units are used to express average speed?

    <p>Kilometers per hour (km/h) (A)</p> Signup and view all the answers

    What does a horizontal line represent on a distance-time graph?

    <p>Object stopped or stationary (C)</p> Signup and view all the answers

    What is the formula for total stopping distance?

    <p>Total stopping distance = thinking distance + breaking distance (B)</p> Signup and view all the answers

    If a car travels a distance of 6000 meters in 400 seconds, what is its average speed?

    <p>15 ms-1 (C)</p> Signup and view all the answers

    What happens to the particles when the temperature increases?

    <p>They gain more energy and move faster. (B)</p> Signup and view all the answers

    What is the impact of increasing the concentration of an acid on the reaction rate?

    <p>It increases the reaction rate. (B)</p> Signup and view all the answers

    What do catalysts do in a chemical reaction?

    <p>They lower the activation energy needed for the reaction. (D)</p> Signup and view all the answers

    Which of the following substances is produced when magnesium reacts with hydrochloric acid?

    <p>Hydrogen and Magnesium Chloride (A)</p> Signup and view all the answers

    What is the primary effect of increasing particle energy during a reaction?

    <p>Particles collide more easily and successfully. (C)</p> Signup and view all the answers

    What does the hazard symbol for 'Caution' indicate?

    <p>Harmful or Irritant (C)</p> Signup and view all the answers

    Which symbol represents a material that can cause environmental damage?

    <p>Environmental Damage (A)</p> Signup and view all the answers

    What potential risk does the 'Explosive' symbol signify?

    <p>May explode easily (D)</p> Signup and view all the answers

    Why are hazard symbols used in science?

    <p>They stand out and are universally understood (D)</p> Signup and view all the answers

    Which hazard symbol indicates a substance that may cause fires?

    <p>Oxidizing Agent (C)</p> Signup and view all the answers

    Study Notes

    Rates of Reaction - Teacher Demo

    • Conclusion: As the temperature increases, the rate of reaction also does.

    Exam Questions

    • What was the independent variable that was changed in the experiment?

      • The temperature of the reactant (water).

    • What was the time taken for the dependent variable that was changed in this experiment?

      • The time taken for the reaction to happen

    • How was this a fair test?

      • We used the same volume and concentration.

    • What would you do to make sure your results are reliable?

      • Repeat to find anomalies and find an average.

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    Description

    Test your understanding of the rates of reaction based on the teacher's demonstration. This quiz covers key concepts, such as independent and dependent variables, fairness in experiments, and ensuring reliable results. Perfect for students studying chemistry experiments and reactions.

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