（7） 42-5 junior high school chemistry, what is the wrong description of these two particles? Give reasons There are two kinds of particles, the total number of protons in their nucleus is different, but the total number of electrons outside the nucleus is equal. The description of these two kinds of particles is wrong () A. It may be atoms and ions of the same element. B. it may be atoms and ions of different elements C. It cannot be atoms and ions of the same element D. it may be molecules and ions composed of the same element

（7） 42-5 junior high school chemistry, what is the wrong description of these two particles? Give reasons There are two kinds of particles, the total number of protons in their nucleus is different, but the total number of electrons outside the nucleus is equal. The description of these two kinds of particles is wrong () A. It may be atoms and ions of the same element. B. it may be atoms and ions of different elements C. It cannot be atoms and ions of the same element D. it may be molecules and ions composed of the same element

A

In the following report, what do you think is scientific A. A fire broke out in a pit well and burned pedestrians. It is estimated that the combustible gas and nitrogen produced in the pit well were caused by an open fire B. Identify the fake silver dollars sold on the street, soak them in copper sulfate solution and observe whether the color changes C. Using the principle that the dry ice in the balloon releases carbon monoxide, the balloon is always in a fully inflated state D. Either enterprises eliminate pollution or enterprises eliminate pollution

A. When other combustible gases are mixed with oxygen to a certain extent, they will explode in case of open fire, and the pit well will burst into fire. It is estimated that the mixture of combustible gas and oxygen produced in the pit well is caused by open fire;
B. False silver dollar is a copper zinc alloy. If the false silver dollar is put into copper sulfate solution, the metal zinc in the silver dollar can react with copper sulfate to form red metal copper, so it is correct
C. Dry ice is solid carbon dioxide. Using the principle that the dry ice in the balloon releases carbon dioxide, the balloon is always in a state of sufficient gas, so C error;
D. Either enterprises eliminate pollution or enterprises eliminate pollution, which shows the importance of controlling environmental pollution, so D is correct
Therefore, BD

Judge right and wrong and correct them 1: Water is a compound composed of hydrogen and oxygen 2: The reaction of water electrolysis belongs to decomposition reaction 3: All substances containing oxygen are oxides

1: Water is a compound composed of hydrogen and oxygen
yes.
2: The reaction of water electrolysis belongs to decomposition reaction
yes.
3: All substances containing oxygen are oxides
Wrong. The compound formed by the combination of elements and oxidation is called oxide

In the reaction of sulfuric acid and sodium hydroxide, H + and oh - form water molecules and Na + and SO42 - form Na2SO4 molecules The reaction of water electrolysis is the process of breaking molecules and atoms and then reassembling them into new molecules

When sulfuric acid and sodium hydroxide react in solution, they exist in the form of ions. Sodium ions and sulfate ions do not participate in the reaction at all. They still exist in the form of ions in the solution, and no sodium sulfate molecules are generated at all. The actual micro process is the reaction of hydrogen ions and hydroxyl ions to produce water

Seeking the reflection and phenomenon of chemistry in junior middle school

2mg + O2 ignition or Δ 2MgO burns violently, dazzling white light, generates white solid, releases heat, produces a large amount of white smoke, and the white signal bomb 2hg + O2 ignites or Δ 2hgo silver white liquid, forming red solid, lavatin experiment 2Cu + O2 ignition or Δ 2CuO red metal turns black solid 4Al + 3O2 ignites or Δ 2al2o3 silver

The description of the following experimental phenomena is incorrect 1. The description of the following experimental phenomena is incorrect A. White phosphorus spontaneous combustion produces a large amount of white smoke and releases heat B. Charcoal burns in oxygen to produce a bright white flame C. The fine iron wire burns violently in oxygen, sparks shoot everywhere, and releases a lot of heat to form a black solid D. When electrolyzing water, the volume of gas generated by the positive electrode is smaller than that generated by the negative electrode (mainly a and b)

B charcoal burns violently in oxygen, emits white light, emits a lot of heat, and produces a gas that can turbidity the clarified lime water, not a white flame
A yes, phosphorus burns and emits white smoke