Endothermic and Exothermic Reactions - Cloze Test Worksheet ... - Free Printable
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Step-by-step solution for: Endothermic and Exothermic Reactions - Cloze Test Worksheet ...
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Step-by-step solution for: Endothermic and Exothermic Reactions - Cloze Test Worksheet ...
Let's solve the worksheet step by step using the word bank provided. The goal is to fill in the blanks with appropriate words from the box.
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Word Bank:
- exothermic
- temperature
- cold
- acid
- removed
- combustion
- reversible
- products
- destroyed
- bond
- respiration
- less
- energy
- reactants
- destroyed
- bonding
- endothermic
- oxidation
- created
- heat
- photosynthesis
- energy
---
Now, let’s go through each question and fill in the missing words.
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1. During a chemical reaction what is always transferred? – ________
✔ Answer: energy
> Explanation: In all chemical reactions, energy is transferred, either absorbed or released.
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2. Described what is meant by the "conservation of energy" - In a chemical reaction energy cannot be ________ or ________.
✔ Answer: created or destroyed
> Explanation: The law of conservation of energy states that energy cannot be created or destroyed, only transformed.
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3. How is energy transferred in chemical reactions? – Through the breaking of chemical bonds in the ________ and creating new bonds in the ________.
✔ Answer: reactants, products
> Explanation: Energy is absorbed to break bonds in reactants and released when new bonds form in products.
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4. What name is given to reactions that transfer energy to the surroundings? – ________
✔ Answer: exothermic
> Explanation: Exothermic reactions release energy (usually as heat) into the surroundings.
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5. How do you know that an exothermic reaction has taken place? – Through an ________ in temperature from the reactants to the products.
✔ Answer: increase
> Explanation: Exothermic reactions release heat, so the temperature increases.
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6. What is the name given to chemical reactions that transfer energy from the surroundings to the reactants? – ________
✔ Answer: endothermic
> Explanation: Endothermic reactions absorb energy from the surroundings.
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7. Name 2 examples of an exothermic reaction. – oxidation, ________, or neutralisation
✔ Answer: combustion or respiration
> Explanation: Common exothermic reactions include combustion (burning), respiration, oxidation, and neutralisation.
So, possible answers:
- combustion
- respiration
(Both are valid; pick one.)
✔ Let's use: combustion
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8. Name 2 examples of an endothermic reaction – ________, sodium hydrogen-carbonate and citric acid or thermal decomposition
✔ Answer: photosynthesis
> Explanation: Photosynthesis is a classic endothermic reaction — it absorbs energy from sunlight.
Other options could include reversible reactions like dissolving ammonium nitrate (but not listed).
From the word bank, photosynthesis fits perfectly.
So, complete answer: photosynthesis
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1. During a chemical reaction what is always transferred? – energy
2. Described what is meant by the "conservation of energy" - In a chemical reaction energy cannot be created or destroyed.
3. How is energy transferred in chemical reactions? – Through the breaking of chemical bonds in the reactants and creating new bonds in the products.
4. What name is given to reactions that transfer energy to the surroundings? – exothermic
5. How do you know that an exothermic reaction has taken place? – Through an increase in temperature from the reactants to the products.
6. What is the name given to chemical reactions that transfer energy from the surroundings to the reactants? – endothermic
7. Name 2 examples of an exothermic reaction. – oxidation, combustion, or neutralisation
8. Name 2 examples of an endothermic reaction – photosynthesis, sodium hydrogen-carbonate and citric acid or thermal decomposition
---
✔ All answers are consistent with the word bank and scientific principles.
Let me know if you'd like this formatted for printing or need a version with explanations for students!
---
Word Bank:
- exothermic
- temperature
- cold
- acid
- removed
- combustion
- reversible
- products
- destroyed
- bond
- respiration
- less
- energy
- reactants
- destroyed
- bonding
- endothermic
- oxidation
- created
- heat
- photosynthesis
- energy
---
Now, let’s go through each question and fill in the missing words.
---
1. During a chemical reaction what is always transferred? – ________
✔ Answer: energy
> Explanation: In all chemical reactions, energy is transferred, either absorbed or released.
---
2. Described what is meant by the "conservation of energy" - In a chemical reaction energy cannot be ________ or ________.
✔ Answer: created or destroyed
> Explanation: The law of conservation of energy states that energy cannot be created or destroyed, only transformed.
---
3. How is energy transferred in chemical reactions? – Through the breaking of chemical bonds in the ________ and creating new bonds in the ________.
✔ Answer: reactants, products
> Explanation: Energy is absorbed to break bonds in reactants and released when new bonds form in products.
---
4. What name is given to reactions that transfer energy to the surroundings? – ________
✔ Answer: exothermic
> Explanation: Exothermic reactions release energy (usually as heat) into the surroundings.
---
5. How do you know that an exothermic reaction has taken place? – Through an ________ in temperature from the reactants to the products.
✔ Answer: increase
> Explanation: Exothermic reactions release heat, so the temperature increases.
---
6. What is the name given to chemical reactions that transfer energy from the surroundings to the reactants? – ________
✔ Answer: endothermic
> Explanation: Endothermic reactions absorb energy from the surroundings.
---
7. Name 2 examples of an exothermic reaction. – oxidation, ________, or neutralisation
✔ Answer: combustion or respiration
> Explanation: Common exothermic reactions include combustion (burning), respiration, oxidation, and neutralisation.
So, possible answers:
- combustion
- respiration
(Both are valid; pick one.)
✔ Let's use: combustion
---
8. Name 2 examples of an endothermic reaction – ________, sodium hydrogen-carbonate and citric acid or thermal decomposition
✔ Answer: photosynthesis
> Explanation: Photosynthesis is a classic endothermic reaction — it absorbs energy from sunlight.
Other options could include reversible reactions like dissolving ammonium nitrate (but not listed).
From the word bank, photosynthesis fits perfectly.
So, complete answer: photosynthesis
---
Final Filled Worksheet:
1. During a chemical reaction what is always transferred? – energy
2. Described what is meant by the "conservation of energy" - In a chemical reaction energy cannot be created or destroyed.
3. How is energy transferred in chemical reactions? – Through the breaking of chemical bonds in the reactants and creating new bonds in the products.
4. What name is given to reactions that transfer energy to the surroundings? – exothermic
5. How do you know that an exothermic reaction has taken place? – Through an increase in temperature from the reactants to the products.
6. What is the name given to chemical reactions that transfer energy from the surroundings to the reactants? – endothermic
7. Name 2 examples of an exothermic reaction. – oxidation, combustion, or neutralisation
8. Name 2 examples of an endothermic reaction – photosynthesis, sodium hydrogen-carbonate and citric acid or thermal decomposition
---
✔ All answers are consistent with the word bank and scientific principles.
Let me know if you'd like this formatted for printing or need a version with explanations for students!
Parent Tip: Review the logic above to help your child master the concept of endothermic and exothermic reactions worksheet.
