Chemical Effects of Electric Current (electroplating, conductivity of liquids, LED test)

Grade 6 Science — Chemical Effects of Electric Current (electroplating, conductivity of liquids, LED test): 25 practice questions with instant scoring and explanations.

1. When electric current passes through a substance and causes a chemical change, it is called:
2. The process of depositing a layer of one metal on another metal using electric current is called:
3. In electroplating, the object to be plated is connected to the _______ terminal of the battery.
4. Electroplating is used to:
5. Which metal is commonly used for electroplating to prevent rusting of iron?
6. A substance that allows electric current to pass through it is called a:
7. Which of the following liquids is a good conductor of electric current?
8. Pure water is a poor conductor of electricity because:
9. When salt (NaCl) is dissolved in water, it becomes a conductor because:
10. An LED (Light Emitting Diode) test is used to:
11. When testing a liquid with an LED circuit, the LED glows if:
12. In an LED test circuit, which component completes the circuit to allow current to flow?
13. When electric current flows through lemon juice, it acts as a:
14. Chromium electroplating on iron is done to:
15. Which of the following is a chemical effect of electric current?
16. In electroplating, the metal to be deposited is called the:
17. Nickel electroplating is commonly used on:
18. The electrolyte in an electroplating cell is:
19. When a battery is connected to an LED tester dipped in salt solution, the LED:
20. Distilled water does not glow an LED because:
21. The process by which electric current breaks down a compound into simpler substances is called:
22. Electroplating requires:
23. When a conducting liquid completes a circuit in an LED test, the current flows through the:
24. Gold electroplating is used on:
25. The brightness of an LED in a conductivity test depends on: