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Anonymous users2024-01-24(1) The gas is flammable and explosive, and turning on the range hood immediately may produce an electric spark, which will ignite the gas and cause an explosion, so C is wrong;
2) When the metal reacts with acid, the stronger the activity of the metal, the more violent the reaction, and vice versa, so it can be seen from the figure that magnesium reacts most violently, followed by zinc, then iron, and copper that does not react, so it can be judged that the order of the activity of these four metals from strong to weak is: Mg Zn Fe Cu;
According to the order of metal activity of copper, iron, and magnesium, it can be known that in the presence of iron wire, copper sulfate solution and magnesium sulfate solution should be selected to verify the activity order of these three metals
So the answer is: (1) AB; （2）①Mg、Zn、Fe、Cu； ②CuSO4；MgSO4．
If you can't connect the gas, the range hood is easy to say.
The heat burned by gas is relatively large, so it is saved.
Some obsessive-compulsive disorder. It doesn't matter if you just close the gas tank door and open it. Don't forget to turn off the gas canister. If you forget to turn off the gas tank, it's dangerous to leave the door open and closed!
Hello, the kitchen is equipped with a gas alarm, and the gas stove can be used with a windshield. Because the alarm is placed near the gas meter.
Residents generally do in their homes. Gas is cheaper than electricity. Those who don't use gas are generally rented by working outside the home. Convenient and safe.