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Class 6 Exam  >  Class 6 Tests  >  IGCSE Cambridge Science for Year 6  >  Test: Chemical Changes and Reactions -2 - Class 6 MCQ

Test: Chemical Changes and Reactions -2 - Class 6 MCQ


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15 Questions MCQ Test IGCSE Cambridge Science for Year 6 - Test: Chemical Changes and Reactions -2

Test: Chemical Changes and Reactions -2 for Class 6 2024 is part of IGCSE Cambridge Science for Year 6 preparation. The Test: Chemical Changes and Reactions -2 questions and answers have been prepared according to the Class 6 exam syllabus.The Test: Chemical Changes and Reactions -2 MCQs are made for Class 6 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Chemical Changes and Reactions -2 below.
Solutions of Test: Chemical Changes and Reactions -2 questions in English are available as part of our IGCSE Cambridge Science for Year 6 for Class 6 & Test: Chemical Changes and Reactions -2 solutions in Hindi for IGCSE Cambridge Science for Year 6 course. Download more important topics, notes, lectures and mock test series for Class 6 Exam by signing up for free. Attempt Test: Chemical Changes and Reactions -2 | 15 questions in 20 minutes | Mock test for Class 6 preparation | Free important questions MCQ to study IGCSE Cambridge Science for Year 6 for Class 6 Exam | Download free PDF with solutions
Test: Chemical Changes and Reactions -2 - Question 1
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Which of the following correctly represents the word equation for the reaction between sulfur and oxygen to form sulfur dioxide?

Detailed Solution for Test: Chemical Changes and Reactions -2 - Question 1
The correct representation of the word equation for the reaction between sulfur and oxygen to form sulfur dioxide is "Sulfur + Oxygen → Sulfur Dioxide." This equation clearly indicates the reactants (sulfur and oxygen) and the product (sulfur dioxide) involved in the chemical reaction.
Test: Chemical Changes and Reactions -2 - Question 2
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How are chemical reactions typically represented according to the model?

Detailed Solution for Test: Chemical Changes and Reactions -2 - Question 2

Chemical reactions are often represented by showing atoms as circles and their combinations in the provided model. This method helps in visualizing how atoms rearrange to form different compounds while following the law of conservation of mass. It simplifies the understanding of how elements combine to form new substances.

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Test: Chemical Changes and Reactions -2 - Question 3
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What types of changes indicate a chemical reaction ?

Detailed Solution for Test: Chemical Changes and Reactions -2 - Question 3

Several observable changes can indicate a chemical reaction, such as an increase in temperature, a change in color, the production of gas, or the formation of a precipitate. These changes signal that a chemical transformation is taking place, where substances are reacting to form new compounds with different properties.

Test: Chemical Changes and Reactions -2 - Question 4
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What color change is observed when zinc metal reacts with a copper sulfate solution?
Detailed Solution for Test: Chemical Changes and Reactions -2 - Question 4
When zinc metal reacts with a copper sulfate solution, the color change observed is from clear to blue. This color change is indicative of a chemical reaction taking place between the zinc metal and the copper sulfate solution, leading to the formation of a new compound.
Test: Chemical Changes and Reactions -2 - Question 5
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How is the presence of carbon dioxide typically confirmed in a chemical reaction?
Detailed Solution for Test: Chemical Changes and Reactions -2 - Question 5
Carbon dioxide is confirmed in a chemical reaction by its characteristic reaction with limewater, turning the limewater milky. This change occurs due to the formation of calcium carbonate when carbon dioxide reacts with the calcium hydroxide present in the limewater. This test is a reliable method for detecting the presence of carbon dioxide in various chemical processes.
Test: Chemical Changes and Reactions -2 - Question 6
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What gas evolution test confirms the presence of hydrogen in a reaction?
Detailed Solution for Test: Chemical Changes and Reactions -2 - Question 6
The 'pop' sound when a burning splint is held near a gas confirms the presence of hydrogen. This distinctive sound is a result of the rapid combustion of hydrogen gas. It's a characteristic test for hydrogen and is a reliable method for its identification in chemical reactions.
Test: Chemical Changes and Reactions -2 - Question 7
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Which gas test involves using a glowing splint to detect the presence of a specific gas?
Detailed Solution for Test: Chemical Changes and Reactions -2 - Question 7
The test involving a glowing splint to detect the presence of oxygen is a classic method. When a glowing splint is introduced to an oxygen-rich environment, the oxygen reignites the splint. This unique property of oxygen allows for its identification through this simple yet effective test.
Test: Chemical Changes and Reactions -2 - Question 8
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Which principle states that no new atoms are created or destroyed, only rearranged in a chemical reaction?
Detailed Solution for Test: Chemical Changes and Reactions -2 - Question 8
The Law of Conservation of Mass states that in a closed system, mass is neither created nor destroyed in a chemical reaction; it is conserved. This means that the total mass of the reactants must equal the total mass of the products. This principle was formulated by Antoine Lavoisier in the late 18th century and is a fundamental concept in chemistry.
Test: Chemical Changes and Reactions -2 - Question 9
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What defines soluble substances in a solution?
Detailed Solution for Test: Chemical Changes and Reactions -2 - Question 9
Soluble substances dissolve in water to form a clear solution, where the dissolved particles are too small to be seen. An interesting fact is that this process involves the solute particles being surrounded by solvent molecules, which keeps them separated and prevents them from recombining.
Test: Chemical Changes and Reactions -2 - Question 10
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What is the primary purpose of handling hot water or chemicals with careful planning in experiments?
Detailed Solution for Test: Chemical Changes and Reactions -2 - Question 10
Handling hot water or chemicals with careful planning in experiments is crucial to avoid burns or reactions. Heat and chemicals can pose significant hazards in the lab, leading to injuries or dangerous reactions if not handled properly. By taking precautions, such as using appropriate protective equipment and following safety protocols, researchers can minimize the risks associated with working with these substances.
Test: Chemical Changes and Reactions -2 - Question 11
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Which property distinguishes colored solutions from colorless solutions?
Detailed Solution for Test: Chemical Changes and Reactions -2 - Question 11
The distinguishing property between colored solutions and colorless solutions is transparency. Colored solutions, like copper sulfate solution which appears blue, maintain their transparency despite having a distinct color. In contrast, colorless solutions like sodium chloride solution are transparent and do not exhibit any noticeable color. This difference in appearance is due to the presence or absence of colored particles in the solution.
Test: Chemical Changes and Reactions -2 - Question 12
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When do precipitation reactions occur in a solution?
Detailed Solution for Test: Chemical Changes and Reactions -2 - Question 12
Precipitation reactions occur when soluble reactants combine to form an insoluble product, known as a precipitate. This precipitate is unable to dissolve in the reaction mixture, leading to its formation and causing the solution to become cloudy. An interesting fact is that precipitation reactions are commonly used in laboratory settings to identify the presence of specific ions in a solution.
Test: Chemical Changes and Reactions -2 - Question 13
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What are the limitations associated with models like word equations and particle diagrams in chemistry?
Detailed Solution for Test: Chemical Changes and Reactions -2 - Question 13
While word equations and particle diagrams are valuable in simplifying and visualizing chemical reactions, they have limitations. One major limitation is that they do not display all the atoms involved in a reaction. They provide a simplified representation and do not show the intricate details of the atomic and molecular interactions that take place during a chemical change.
Test: Chemical Changes and Reactions -2 - Question 14
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Why is it important to have detailed particle interaction models in chemistry, especially when dealing with solubility of substances?
Detailed Solution for Test: Chemical Changes and Reactions -2 - Question 14
Detailed particle interaction models are crucial in chemistry, particularly when assessing the solubility of substances. These models help definitively determine whether a substance is soluble or insoluble in a given solvent based on the interactions between particles. Understanding solubility is essential in various chemical processes and for predicting the behavior of substances in solution.
Test: Chemical Changes and Reactions -2 - Question 15
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What is the primary function of pH meters in measuring pH levels?
Detailed Solution for Test: Chemical Changes and Reactions -2 - Question 15
pH meters are designed to directly measure the pH of a solution. They consist of a probe connected to a meter, providing a more precise and accurate measurement of the pH level compared to using chemical indicators. This direct measurement is essential in various scientific and industrial applications where knowing the exact pH value is crucial for the desired outcome.
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