Question

true or false???
1. Physical reactions can change the physical properties of a substance.

2. In a physical reaction, the chemical properties of the substances change.

3. If the bonds in the reactants are broken, a chemical reaction has occurred.

4. Reactants can be found to the right of the arrow in a chemical equation.

5. The products are the things that are mixed together to start a reaction.

6. In Element X bonds with Chemical Y, the product will have a combination of the properties of the original elements.

7. The products of a reaction can be found to the right of the arrow in a chemical equation.

8. Tearing a piece of paper in half is a physical change.

9. Burning a match is a chemical change.

10. Gas production is a sign of a chemical change.

11. Boiling is a sign of a chemical change.

12. All phase changes are physical changes.

13. Food coloring is dissolved in water. This is a chemical change.

14. Dry ice sublimates from a solid to a gas. This is a physical change.

15. A precipitate is formed when two solutions mix to form a solid.

16. An acid and a base mix to form something neutral. The pH change indicates a chemical reaction occurred.

17. The leaves change color in the fall. This is a sign of a chemical change.

18. A student makes a volcano for a science fair project. She mixes vinegar and baking soda together and carbon dioxide gas is formed. The vinegar and baking soda are the products.

19. A student makes a volcano for a science fair project. She mixes vinegar and baking soda together and carbon dioxide gas is formed. The gas production is a sign of a chemical change.

20. After a chemical reaction, you would expect to find the same molecules that you started with.

21. If the chemical properties of the reactants change, a physical change has occurred.

22. Photosynthesis is a chemical reaction.

23. Adding energy, adding a solute, and tearing matter are ways to cause a physical change to occur.

24. Dissolving is a physical change.

25. Water is boiling in a pot and bubbles are rising to the top of the water. The gas production indicates a chemical change.

26. Color change, temperature change, and pH change are all signs of a chemical change.

27. Anytime something is burned by fire, there is a chemical reaction.

28. Adding salt to water increases the boiling point. This is an example of a chemical change.

29. Physical and chemical reactions change the properties of the substances involved.

30. Chemical changes cause changes to both physical and chemical properties.

Answer 1

• True
• False
• False
• True
• True
• False

Hope it's help you