(a) acids, bases and salts (b) chemical (c) negative (d) electroplating.
The solution allows electric current to pass, and current in the tester wire produces a magnetic effect that deflects the needle.
Lemon juice, vinegar and salt solution.
The liquid may be a poor conductor, current may be too weak, the bulb may be fused, cells may be weak, or connections may be loose.
- i. liquid A is a better conductor than liquid B
- ii. liquid B is a better conductor than liquid A
- iii. both are equally conducting
- iv. conducting properties cannot be compared
(i) liquid A is a better conductor than liquid B.
Pure water is a poor conductor. Adding a small amount of salt, acid or base makes it conducting.
Ordinary water conducts electricity. Shutting off supply prevents electric shock.
Seawater contains more dissolved salts, so it conducts electricity better.
No. Rainwater with dissolved salts conducts electricity and increases risk of electric shock.
Rainwater dissolves gases, dust and salts from air and containers, so it can conduct electricity.
Chrome-plated taps, bicycle handles, artificial jewellery, tin-plated food cans, and gold- or silver-plated ornaments.
The impure copper rod should be connected to the positive terminal. Copper dissolves from it into solution and deposits on the thin pure copper plate connected to the negative terminal.