1. A ____________________ occurs when two or more substances interact forming a new substance.
A. Physical change
B. Chemical change ****
C. Ecosystems
D. Physical reaction
2. Is iron rusting a Physical or Chemical Change?
A. Physical Change
B. Chemical Change ****
3. Is paper tearing a Physical or Chemical Change?
A. Physical Change ****
B. Chemical Change
4. Is wood burins a Physical or Chemical change?
A. Physical Change
B. Chemical Change ****
5. Which of the following is NOT a sign of a Chemical Change?
A. Combustion/burning
B. Bubbling/fizzing
C. Precipitate
D. Changing shape ****
6. Which is NOT a sign of a Physical Change?
A. Unexpected color change ****
B. Changing texture
C. Changing temperature
D. Changing state of matter
7. Is chopping vegetables a Physical or Chemical Change?
A. Physical ****
B. Chemical
8. Is fireworks going off (exploding) a Physical or Chemical Change?
A. Physical
B. Chemical ****
9. Is boiling water a Physical or Chemical Change?
A. Physical
B. Chemical ****
I used to be a baker, but I couldn't make enough dough. Now I'm a bot, and I'm in the "bot"ness of making jokes!
10. Why did the clown go to school?
A. To improve his sillyness!
11. How do you organize a space party?
A. You just planet!
12. Why don't scientists trust atoms?
A. Because they make up everything!
13. Why did the scarecrow win an award?
A. Because he was outstanding in his field!
14. What do you call a fish with no eyes?
A. Fsh!
15. Why don't skeletons fight each other?
A. They don't have the guts!
16. How does a penguin build its house?
A. Igloos it together!
17. What did one wall say to the other wall?
A. I'll meet you at the corner!
18. Why don't eggs tell jokes?
A. Because they might crack up!
19. Why did the tomato turn red?
A. Because it saw the salad dressing!
20. How do you make a tissue dance?
A. Put a little boogie in it!
1. B. Chemical change occurs when two or more substances interact forming a new substance.
2. B. Iron rusting is a Chemical Change.
3. A. Paper tearing is a Physical Change.
4. B. Wood burning is a Chemical Change.
5. D. Changing shape is NOT a sign of a Chemical Change.
6. A. Unexpected color change is NOT a sign of a Physical Change.
7. A. Chopping vegetables is a Physical Change.
8. B. Fireworks going off (exploding) is a Chemical Change.
9. A. Boiling water is a Physical Change.
To answer these questions, we need to understand the difference between physical and chemical changes.
1. A chemical change occurs when two or more substances interact, forming a new substance. Therefore, the correct answer is B. Chemical change.
2. Iron rusting involves a chemical reaction between iron and oxygen in the presence of moisture, which results in the formation of iron oxide (rust). This is a chemical change, so the correct answer is B. Chemical Change.
3. Paper tearing is a physical change because it only affects the physical properties of the paper, such as the shape or size, without forming any new substances. Therefore, the correct answer is A. Physical Change.
4. Wood burning involves a chemical reaction between wood and oxygen, which produces heat, light, carbon dioxide, and ashes. This is a chemical change, so the correct answer is B. Chemical Change.
5. Changing shape is a physical change because it does not involve the formation of a new substance. Therefore, the correct answer is D. Changing shape.
6. An unexpected color change is a sign of a chemical change, not a physical change. Therefore, the correct answer is A. Unexpected color change.
7. Chopping vegetables is a physical change because it only affects the physical properties of the vegetables, such as their size or shape. Therefore, the correct answer is A. Physical.
8. Fireworks going off (exploding) involve various chemical reactions that release energy in the form of light, heat, and sound. This is a chemical change, so the correct answer is B. Chemical Change.
9. Boiling water is a physical change because it only changes the state of matter from a liquid to a gas (water vapor) without forming any new substances. Therefore, the correct answer is A. Physical.