Browse Worksheets

Topic: Chemical and Physical Changes

 

Name: ___________________________                                                  Date: ___________________________

 

Section A: Multiple Choice Questions

 

1. Which of the following is a physical change?
   a) Burning paper
   b) Ice melting
   c) Rust forming

2. Answer: ____________

3.  
4. What happens during a chemical change?
   a) Only the shape changes
   b) A new substance is formed
   c) The change can be reversed easily

5. Answer: ____________

6.  

Section B: True or False

 

1. Breaking a glass is a chemical change. (True/False)
2.  
3. Cooking an egg is a chemical change. (True/False)
4.  

Section C: Fill in the Blanks

 

1. A chemical change results in the formation of a ____________.
2.  
3. A ____________ change involves only the appearance or state of the substance, not its composition.
4.  

Section D: Short Questions

 

1. What is the main difference between a physical and chemical change?
2.  

 

 

 

1. Give one example each of a physical and a chemical change.
2.  

 

 

 

Section E: Diagram Activity

 

 

Study the diagram  and answer the questions:
(Image provided shows ice melting into water and paper burning into ash)

1. Label which side shows a physical change and which shows a chemical change.
2. Explain what happens to the particles in each type of change.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Answer the following questions 

 

1. Which of the following best describes adaptation?

   a) The process by which organisms change over time

   b) The process of developing new species

   c) The process of migration to different habitats

   d) The process of hibernation during winter

 

2. What is the main purpose of adaptation in living organisms?

   a) To increase their lifespan

   b) To prevent diseases

   c) To survive and reproduce in their environment

   d) To communicate with other organisms

 

3. Which of the following is an example of a structural adaptation?

   a) The ability of a chameleon to change its skin color

   b) The migration of birds during winter

   c) The hibernation of bears during the cold season

   d) The ability of a shark to detect electrical signals

 

4. Which of the following is an example of a behavioral adaptation?

   a) The long neck of a giraffe

   b) The camouflage of a chameleon

   c) The migration of monarch butterflies

   d) The sharp claws of a tiger

 

5. How does camouflage help an organism survive?

   a) It helps the organism find food more easily

   b) It helps the organism attract a mate

   c) It helps the organism hide from predators or prey

   d) It helps the organism communicate with others

 

6. Which of the following is an example of a plant adaptation?

   a) The ability of a cactus to store water

   b) The ability of a butterfly to fly long distances

   c) The ability of a squirrel to climb trees

   d) The ability of a snake to shed its skin

 

7. What is mimicry as an adaptation?

   a) The ability of an organism to produce toxins

   b) The ability of an organism to imitate the appearance of another organism

   c) The ability of an organism to run at high speeds

   d) The ability of an organism to change its body coloration

 

8. Which of the following is an example of a physiological adaptation?

   a) The ability of a bird to build a nest

   b) The ability of a fish to breathe underwater

   c) The ability of a plant to photosynthesize

   d) The ability of a mammal to change its fur color

 

9. How do organisms with adaptations have an advantage over those without?

   a) They can live longer lives

   b) They can reproduce more offspring

   c) They can communicate with other organisms more effectively

   d) They can survive and thrive in their environment

 

10. Which of the following is NOT an example of an adaptation?

    a) A polar bear's thick fur to keep it warm in the Arctic

    b) A cheetah's speed to catch its prey

    c) A peacock's colorful feathers to attract a mate

    d) A dog's ability to perform tricks for treats

 

11. What is an ecosystem?

   a) A group of organisms living together in a habitat

   b) The study of rocks and minerals in a given area

   c) The process of converting sunlight into food energy

   d) The interaction between predators and prey

 

12. What are the components of an ecosystem?

   a) Rocks and minerals

   b) Producers, consumers, and decomposers

   c) Sunlight and water

   d) Oxygen and carbon dioxide

 

13. What are producers in an ecosystem?

   a) Organisms that consume other organisms for energy

   b) Organisms that produce their own food through photosynthesis

   c) Organisms that break down dead organic matter

   d) Organisms that decompose waste materials

 

14. Which of the following is an example of a consumer in an ecosystem?

   a) Grass

   b) Rabbit

   c) Tree

   d) Fungus

 

15. What is the role of decomposers in an ecosystem?

   a) They break down dead organisms and recycle nutrients

   b) They produce food through photosynthesis

   c) They are the top predators in the ecosystem

   d) They help plants grow by providing them with nutrients

 

16. What is the primary source of energy in most ecosystems?

   a) Rocks and minerals

   b) Sunlight

   c) Oxygen

   d) Water

 

17. How do consumers obtain energy in an ecosystem?

   a) They produce their own food through photosynthesis

   b) They consume other organisms

   c) They break down dead organic matter

   d) They absorb nutrients from the soil

 

18. Which of the following is an example of a decomposer in an ecosystem?

   a) Lion

   b) Grasshopper

   c) Mushroom

   d) Algae

 

19. What is the main difference between producers and consumers in an ecosystem?

   a) Producers produce their own food, while consumers consume other organisms for energy

   b) Producers are carnivores, while consumers are herbivores

   c) Producers are microscopic, while consumers are macroscopic

   d) Producers live in water, while consumers live on land

 

20. How are energy and nutrients transferred in an ecosystem?

    a) Energy flows from producers to consumers, while nutrients flow from consumers to producers

    b) Energy and nutrients flow from producers to consumers

    c) Energy and nutrients flow from consumers to producers

    d) Energy and nutrients flow randomly within the ecosystem

 

21. What is a food chain?

   a) A group of organisms living together in a habitat

   b) The study of rocks and minerals in a given area

   c) The process of converting sunlight into food energy

   d) The sequence of organisms where one organism eats another organism to obtain energy

 

22. What do arrows represent in a food chain?

   a) The direction of energy flow

   b) The movement of organisms

   c) The relationship between producers and consumers

   d) The process of photosynthesis

 

23. What is a food web?

   a) A single line of organisms that shows the flow of energy

   b) A diagram representing the interconnected food chains in an ecosystem

   c) A process where organisms convert food into energy

   d) The interaction between predators and prey

 

24. How are food chains and food webs different?

   a) Food chains show more complex interactions than food webs

   b) Food webs focus on energy flow, while food chains focus on species interactions

   c) Food chains are more accurate representations of ecosystems than food webs

   d) Food webs are linear, while food chains are interconnected

 

25. What is the primary source of energy in a food chain or web?

   a) Sunlight

   b) Producers

   c) Decomposers

   d) Consumers

 

26. What is the role of decomposers in energy flow within an ecosystem?

   a) They consume primary consumers for energy

   b) They produce food through photosynthesis

   c) They break down dead organisms and release nutrients back into the ecosystem

   d) They are the top predators in the food chain

 

27. How does energy flow in a food chain or web?

   a) Energy flows from consumers to producers

   b) Energy flows from decomposers to consumers

   c) Energy flows from producers to consumers

   d) Energy flows from predators to prey

 

28. What happens to the amount of energy as you move up the food chain or web?

   a) The amount of energy decreases

   b) The amount of energy increases

   c) The amount of energy stays the same

   d) The amount of energy fluctuates

 

29. What are trophic levels in a food chain or web?

   a) The different types of habitats within an ecosystem

   b) The different reproductive strategies of organisms

   c) The positions that organisms occupy in the energy pyramid

   d) The various biomes found in a specific region

 

30. How do disruptions in one part of a food chain or web affect the entire ecosystem?

    a) Disruptions only affect the organisms directly involved

    b) Disruptions lead to increased biodiversity within the ecosystem

    c) Disruptions can cause imbalances and negatively impact other organisms

    d) Disruptions have minimal impact on the overall functioning of the ecosystem

Break the code

Break even

breaking news

reading comprehension
regular vs irregular verbs

Breaking News Explosion in Neuquen 2022
Breaking News
Vocabulary
Regular and Irregular Verbs
Simple Past

S3-WINTER-BREAK-FLYERS-PRACTICE-trang-9-10

Break Even Calculation

Give teens a break

Complete the newspaper story with the correct form of the verbs.

Travel Worksheet: Past Continuous Tense for Describing Interrupted Actions

Name: _______________________

Date: _______________________

 

Instructions: Complete the exercises below using the past continuous tense to describe interrupted actions in the past. Part 1: Fill in the Blanks Complete the sentences using the past continuous tense of the verbs in parentheses.

 

1. While I ______________ (explore) the city, it ______________ (start) to rain.

2. We ______________ (take) a guided tour when the bus ______________ (break) down.

3. She ______________ (take) pictures of the monuments while her friends ______________ (shop) nearby.

4. They ______________ (enjoy) their dinner at the restaurant when the power ______________ (go) out.

5. He ______________ (relax) on the beach when someone ______________ (steal) his bag.

 

Part 2: Choose the Correct Option Select the correct verb form to complete each sentence.

 

1. We were having lunch when the tour guide __________ (was arriving / arrived).

2. She __________ (was looking / looked) at the map while they were waiting for the train.

3. The children __________ (were playing / played) at the park when it started to rain.

4. I __________ (was walking / walked) around the city center when I met an old friend.

5. They __________ (were booking / booked) their tickets when the website crashed.

 

 

Part 3: Rewrite the Sentences Rewrite the following sentences using the past continuous to show interrupted actions.

 

1. I visited the museum. I met some interesting people. o While I __________, I __________.

2. She was eating lunch. Her phone rang. o While she __________, __________.

3. They were hiking in the mountains. It started to snow. o While they __________, __________.

4. We were watching a movie. The fire alarm went off. o While we __________, __________.

5. He was reading a book. His friend called him. o While he __________, __________.

 

Part 4: Travel Story Write a short travel story (about 5-6 sentences) describing a situation where one action was interrupted by another. Use the past continuous tense in your story.

 

Part 5: Check Your Understanding Answer these questions about the past continuous tense.

1. When do we use the past continuous tense? o To describe actions that __________.

2. How do we form the past continuous tense? o We use __________ + __________ + __________.

3. Give an example sentence using the past continuous tense to describe an interrupted action.

 

 

Answer Key (for teacher reference): Part 1: 1. was exploring, started 2. were taking, broke 3. was taking, were shopping 4. were enjoying, went 5. was relaxing, stole Part 2: 1. arrived 2. was looking 3. were playing 4. was walking 5. were booking Part 3: 1. I was visiting the museum when I met some interesting people. 2. While she was eating lunch, her phone rang. 3. While they were hiking in the mountains, it started to snow. 4. While we were watching a movie, the fire alarm went off. 5. While he was reading a book, his friend called him. Part 4: (Students’ answers will vary. Ensure the past continuous is used correctly.) Part 5: 1. To describe actions that were in progress when another action occurred. 2. was/were + verb + -ing 3. Example: While I was exploring the city, I bumped into an old friend.

Students need to catch up - week after mid term break

Mission 1: The Hunt 🔍

• Read the passage about Gotipua dancers.
• Identify the sentence that is NOT a complex sentence.
• DRAG it and DROP into the ‘ODD 1 OUT BOX'.

Mission 2: The Surgery ✂️

• Break each complex sentences into two parts.
• Type the Independent Clause to the Main Clause column.
• Type the Dependent Clause to the Subordinate Clause column.

a short conversation to practice rules and the use of should

BREAK TIME ACTIVITIES

ice break for pre-intermediate

Breaking words into syllables for pronunciation

1. Simple Sentence

A simple sentence contains only one independent clause (a complete thought). It has a subject and a verb, and it expresses a complete idea.

Structure:

Subject + Verb (and sometimes an object or complement)

Examples:

1. I eat lunch every day.
   (Subject: "I", Verb: "eat")
2. She studied for the exam.
   (Subject: "She", Verb: "studied")
3. The dog barked loudly.
   (Subject: "The dog", Verb: "barked")

2. Compound Sentence

A compound sentence consists of two or more independent clauses joined by a coordinating conjunction (for, and, nor, but, or, yet, so), or by a semicolon.

Structure:

Independent clause + coordinating conjunction + independent clause

Examples:

1. I wanted to go to the party, but I was too tired.
   (Two independent clauses: "I wanted to go to the party" and "I was too tired," joined by "but")
2. She likes reading books, and he enjoys playing sports.
   (Two independent clauses: "She likes reading books" and "He enjoys playing sports," joined by "and")
3. I am studying for my test; I will take a break later.
   (Two independent clauses joined by a semicolon)

3. Complex Sentence

A complex sentence contains one independent clause and at least one dependent clause (a clause that cannot stand alone and does not express a complete thought). Dependent clauses are connected to the independent clause by a subordinating conjunction (because, although, if, when, since, etc.).

Structure:

Independent clause + subordinating conjunction + dependent clause

Examples:

1. I stayed home because it was raining.
   (Independent clause: "I stayed home" and dependent clause: "because it was raining")
2. Although she was tired, she finished her homework.
   (Independent clause: "She finished her homework" and dependent clause: "although she was tired")
3. We will go to the park if it doesn't rain.
   (Independent clause: "We will go to the park" and dependent clause: "if it doesn't rain")

4. Compound-Complex Sentence

A compound-complex sentence is a combination of both a compound sentence and a complex sentence. It contains at least two independent clauses and at least one dependent clause.

Structure:

Independent clause + coordinating conjunction + independent clause + subordinating conjunction + dependent clause

Examples:

1. I wanted to go to the beach, but it started raining, so we stayed home.
   (Independent clauses: "I wanted to go to the beach" and "it started raining," joined by "but"; dependent clause: "so we stayed home")
2. Although I studied hard, I didn't pass the test, and I felt disappointed.
   (Independent clauses: "I didn't pass the test" and "I felt disappointed," joined by "and"; dependent clause: "Although I studied hard")
3. She loves reading books, and she often reads late into the night, because she finds it relaxing.
   (Independent clauses: "She loves reading books" and "She often reads late into the night," joined by "and"; dependent clause: "because she finds it relaxing")

Breaking the low 3a