Xiao Liang found that the collected oxygen accounted for the collected gas

1) When potassium permanganate is heated, manganese dioxide, potassium manganate and oxygen are generated, and the expression is potassium permanganate - heating - potassium manganate + manganese dioxide + oxygen;

2) Through experiments, it can be seen that the oxygen content reaches 35%, and the wooden strip with Mars can be rekindled, so the method of using the wooden strip with Mars to fill the oxygen is unreliable;

3) From the conditions provided by the question stem, it can be seen that the volume fraction of oxygen in the gas collector cylinder = the volume fraction of the collected oxygen in the volume + the volume fraction of the air in the cylinder The volume fraction of the oxygen in the air

4) As can be seen from the figure, when the volume fraction of oxygen reaches 35%, the wooden strip with sparks rekindles At this time, the air still accounts for 65%, so the amount of oxygen in the air is: 65% 21% 14%, so the fraction of total oxygen in the bottle at this time is: 14% + 35% = 49%;

5) Considering only the influence of the volume fraction of oxygen on the experimental results, in order to rekindle the wooden strip with Mars, the oxygen content needs to be 48% 49%, and the coordinates can be analyzed, and the temperature can be known to be about 82;

6) Take the "half-value method" ** to reduce the number of experiments, in fact, through the analysis of experimental data, reduce unnecessary experiments, the second group of experiments if the experiment is carried out in the order of the number, can determine that the volume fraction of the oxygen collected by the next group of experiments should be between 33% and 35%, so as to omit the number of experiments

Therefore, the answer is: (1), potassium permanganate potassium manganate + manganese dioxide + oxygen; 2), No;

49% (the calculation result is kept as an integer);

1) Potassium permanganate (condition is heating), potassium manganate, manganese dioxide, oxygen.

Hydrogen peroxide (conditioned as "manganese dioxide", manganese dioxide acts as a catalyst) water oxygen.

Potassium chlorate (Conditions: Catalyst "Manganese Dioxide, heated") Potassium chloride Oxygen.

Choose one. 2) Reliable.

1) Potassium permanganate can be decomposed.

2) Reliable. 3) 21 (mainly taking into account the volume fraction of oxygen in air).

4) Bring the volume fraction of the group that rekindles into the formula in (3).

(1) If potassium permanganate or potassium chlorate is used to make oxygen, it needs to be heated, potassium chlorate generates potassium chloride and oxygen under the condition of manganese dioxide as a catalyst and heating, and potassium permanganate is decomposed by heat to form potassium manganate and manganese dioxide and oxygen, and attention should be paid to balancing; So the answer is: 2kclo3

mno.2kCl+3O2 or 2kmNO4

k2mno4+mno2+o2↑

2) From the information given in the question, it can be seen that when the collected oxygen accounts for 60% of the volume of the gas collector cylinder (40% of the air), it can re-ignite the wooden strip with sparks, so this method of filling is unreliable So the answer is: no.

3) When the volume fraction of oxygen in the volume is at least 35%, the air is 65%, assuming that the gas mixture is 100L, then the oxygen is 35L, and the air is 65L Oxygen accounts for about 21% of the volume of air, so the oxygen in the air = 65L 21% =, then the volume fraction of oxygen = 35L+

100L100% 49%, so the answer is: 49

1) The chemical equation for heating potassium permanganate to produce oxygen is: 2kmNO4

k2mno4

mno2o2

2) Unreliable, because when the volume fraction of oxygen reaches 35%, the wooden strip with sparks can reignite So: No.

3) Volume fraction of oxygen in the gas collector cylinder = volume fraction of collected oxygen in volume + volume fraction of air in cylinder Volume fraction of oxygen in air Therefore, fill in: 21

4) As can be seen from the figure, when the volume fraction of oxygen reaches 35%, the wooden strip with sparks rekindles so fill in: 35

At this time, the volume fraction of oxygen in the gas collection cylinder is: 35%+65% 21%=49% Therefore, fill in: 49

1) Oxygen has combustible properties, which can rekindle the wooden strips with sparks, so the method of collecting oxygen by the laboratory exhaust method will put the wooden strips with sparks into the mouth of the gas collection cylinder, and if the wooden strips rekindle, it proves that the oxygen has been collected;

2) Through experiments, it can be seen that the oxygen content reaches 35%, and the wooden strip with Mars can be rekindled, so the method of using the wooden strip with Mars to fill the oxygen is unreliable;

3) The volume fraction of oxygen in the gas collector cylinder = the volume fraction of the collected oxygen in the volume + the volume fraction of the air in the empty field in the cylinder Volume fraction of oxygen in the air, where the volume fraction of oxygen in the air is 21%;

4) As can be seen from the figure, when the volume fraction of oxygen reaches 35%, the blind strip with sparks rekindles; At this time, the air still accounts for 65%, so the amount of oxygen in the air is: 65% 21% 14%, so the fraction of total oxygen in the bottle at this time is: 14% + 35% = 49%, if the oxygen accounts for one-fifth of the air volume, the result is 48%;

5) Considering only the influence of the volume fraction of oxygen on the experimental results, in order to rekindle the wooden strip with Mars, the oxygen content needs to be 48% 49%, and the coordinates can be analyzed, and the temperature can be known to be about 82;

6) Take the "half-value method" ** can reduce the number of experiments, in fact, through the analysis of experimental data, reduce unnecessary experiments, if the second group of experiments are carried out in the order of numbering, you can determine that the volume fraction of oxygen collected by the next group of experiments should be between 33% and 35%, so as to omit the number of experiments, so the answer to this question is:

Therefore, the answer is: (1) put the wooden strip with sparks into the mouth of the gas collection cylinder, if the wooden strip rekindles, it proves that the oxygen has been collected; Combustion; 2), No;

4) State ridge empty 35; 49；

5) 82 (81 and 84 are evenly scored);

（1）2h2o2

mno.o2↑+2h2o．

2) Through experiments, it can be seen that the oxygen content reaches 35% and the wooden strip with Mars can be rekindled, so the method of using the wooden strip with Mars to fill the oxygen is unreliable, so the answer to this question is: No, 3) The volume fraction of oxygen in the gas collection cylinder = the volume fraction of the collected oxygen in the volume + the volume fraction of the air in the bottle The volume fraction of oxygen in the air Therefore, fill in: 21

4) As can be seen from the figure, when the volume fraction of oxygen reaches 35%, the wooden strip with sparks rekindles so fill in: 35At this time, the air still accounts for 65%, so the amount of oxygen in the air is: 65% 21% 14%, so the fraction of total oxygen in the bottle at this time is:

14% + 35% = 49%, if calculated with oxygen as one-fifth of the volume of air, the result is 48%, so the answer to this question is: 35, 48 or 49;

5) Considering only the influence of the volume fraction of oxygen on the experimental results, in order to rekindle the wooden strip with Mars, the oxygen content needs to be 48% 49%, and the coordinates can be analyzed, and the temperature can be known to be about 82;

6) Take the "half-value method" ** can reduce the number of experiments, in fact, through the analysis of experimental data, reduce unnecessary experiments, if the second group of experiments are carried out in the order of numbering, you can determine that the volume fraction of oxygen collected by the next group of experiments should be between 33% and 35%, so as to omit the number of experiments, so the answer to this question is:

So the answer is: (1) 2H2O2

mno.o2 +2h2o (all other reasonable answers are scored) 2) No.

5) 82 (81 and 84 are evenly scored);

【Theory**】Because the iron wire begins to melt due to the increase in temperature and then reaches the ignition point of combustion, the temperature needs to reach the melting point of iron, and because the product is ferric oxide, the temperature cannot be higher than the decomposition temperature of ferric tetroxide, otherwise the ferric oxide will not be obtained, so the temperature is between 1535 and 1538; Since the iron oxide has decomposed at this temperature, the iron oxide cannot be obtained;

So the answer is: 1535---1538; fe2 o3 ．

【Theory**】Because the iron wire begins to melt due to the increase in temperature and then reaches the ignition point of combustion, the temperature needs to reach the melting point of iron, and because the product is ferric oxide, the temperature cannot be higher than the decomposition temperature of ferric tetroxide, otherwise the ferric oxide will not be obtained, so the temperature is between 1535 and 1538; Since the iron oxide has decomposed at this temperature, the iron oxide cannot be obtained;

So the answer is: 1535---1538; fe2o3