Comparisons of reaction heat and related calculation rules
1. **反应热大小比较规则** - **根据物质状态判断**：当物质由固态变为液态再变为气态时，这个过程需要吸收热量。所以在比较反应热大小时，如果反应产物状态不同，气态产物对应的反应通常比液态产物对应的反应吸收更多热量（反应热数值更大且为正值），液态产物对应的反应比固态产物对应的反应吸收更多热量（反应热数值更大且为正值）;反之，在放热反应中，气态反应物变为液态或固态反应物时，反应放出的热量更多（反应热数值更大且为负值）。 - **根据反应类型判断**：不同类型的反应热效应不同。例如，燃烧反应通常是放热反应，反应热为负值;而分解反应有些是吸热反应，反应热为正值。一般来说，放热反应的反应热（\(\Delta H\)）数值小于0，放热越多，\(\Delta H\)数值越小;吸热反应的反应热（\(\Delta H\)）数值大于0，吸热越多，\(\Delta H\)数值越大。 - **根据化学计量数判断**：在热化学方程式中，反应热数值与各物质的化学计量数成正比。例如，对于反应\(aA + bB=cC + dD\)，如果化学计量数变为\(2aA + 2bB = 2cC+2dD\)，则反应热\(\Delta H\)也变为原来的2倍。在比较反应热大小时，如果两个反应相似，化学计量数大的反应，其反应热数值也会按比例增大（吸热反应增大正值，放热反应增大负值）。 2. **反应热计算规则** - **根据盖斯定律计算** - 首先要明确所求反应的始态和终态、各物质的化学计量数及反应的吸、放热情况。不同途径对应的最终结果应一样。 - 当热化学方程式乘以或除以某一个数时，\(\Delta H\)也应乘以或除以同一个数;方程式进行加减运算时，\(\Delta H\)也同样要进行加减运算，注意各步反应\(\Delta H\)的正负。 - 将一个热化学方程式逆向书写时，\(\Delta H\)的符号也随之改变，但绝对值不变。 - **根据标准摩尔生成焓计算（定温定压过程）**：反应的标准摩尔焓变等于产物的标准摩尔生成焓之和减去反应物的标准摩尔生成焓之和，即\(\Delta_{r}H_{m}=\sum\Delta_{f}H_{m}\)（总生成物）\(-\sum\Delta_{f}H_{m}\)（总反应物）（如果有参考状态单质，则其标准摩尔生成焓为零）。 - **根据标准摩尔燃烧焓计算（定温定压过程）**：反应的标准摩尔焓变等于反应物的标准摩尔燃烧焓之和减去产物的标准摩尔燃烧焓之和，即\(\Delta_{r}H_{m}=\sum\Delta_{c}H_{m}\)（总反应物）\(-\sum\Delta_{c}H_{m}\)（总生成物）（参考状态单质只适用于标准摩尔生成焓，其标准摩尔燃烧焓不为零）。 - **根据化学键的键能计算**：化学反应中的反应热\(\Delta H=\)反应物的总键能 - 生成物的总键能;也可以根据\(\Delta H=\)生成物的总能量 - 反应物的总能量计算。 - **根据热化学方程式计算**：热化学方程式中反应热数值与各物质的化学计量数成正比。例如已知生成一定量某物质的反应热，可根据化学计量数比例关系计算其他量对应的反应热。 点击前往免费阅读更多精彩小说
I'm really not a sorrowful novel by a witch or a few people
" I'm Really Not a Witch " was a dark loli transformation novel created by a few sorrowful people. In the novel, the protagonist was killed in his previous life because his younger sister was involved in a dispute over the Force. After rebirth, the protagonist's gender changed from male to female and became the older sister. He even obtained a rabbit hairpin that could absorb resentment and strengthen himself. After the protagonist discovered that the world was not simple, he worked hard to change his fate. His style was decisive and decisive. It belonged to the dark type of transformation novel. Unlike many otaku, fujoshi, plagiarist, entertainment, and streamer types of transformation novels, it was a growth story of a villain boss. It included the plot of the protagonist's sisters. The total word count was 1,380,700 and it was completed. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Team Happy's Champion List Announced
Team Happy's champions were: Captain Ye Xiu, Team members Su Mucheng, Fang Rui, Qiao Yifan, Tang Rou, An Wenyi, Mo Fan, Bao Rongxing (Steamed Bun Invasion), Luo Ji, Wei Chen, An Wenyi (Little Cold Hands), Concealed Light, Yang Cong, Qiao Yifan, Zou Yuan, Chu Yunxiu, Qiu Fei, Yu Feng, Sun Xiang. While waiting for the anime, you can also click on the link below to read the classic original work of The King's Avatar!
Who are the post-2000 songwriters? Girls sing
There were Zhang Yuqi, Chen Xuening, Faougia, and other female singers who wrote after 2000. Zhang Yuqi performed well on the stage of "The Son of Tomorrow" and participated in "Singer 2024" and was successfully unveiled. Chen Xuening was well-known for "White Mountain Tea" when she was 15 years old. Her original songs such as "Pretend","Green" and "Your Tavern Closed to Me" were favored by netizens. Faougia Fansia was a female singer born in the 2000s. She won the championship with her superb music performance and strong stage control in the show "Singer 2024" with the song "Desert Rose." <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Thousand-Year Wolf Demon
In the Xianxia drama " Praying for the Present," there was a role of a thousand-year-old wolf demon, played by Fu Xinbo. Xian Qing was unrestrained and could even selflessly lend his cultivation to others. Luo Zhaoyan's father had once used his life to ask Xian Qing for half of his cultivation to extend his daughter's life. However, although Luo Zhaoyan had half of Xian Qing's cultivation, he could not live forever and was still short-lived. Xianqing also had his own love. In order to be together with Luo Zhaoyan, after Luo Zhaoyan and the others joined forces to defeat Lord Ming, he taught Luo Zhaoyan how to cultivate demons. This way, Luo Zhaoyan would become a demon and be able to stay with him forever. This was because the curse of the Luo family was targeted at humans, not demons. In addition, there was also the plot of Qing Xue accidentally awakening the thousand-year-old wolf demon at the bottom of the lake while helping Tu Su heal his injuries, but this plot had nothing to do with the wolf demon Xianqing in Praying for the Present. While waiting for the TV series, you can also click on the link below to read the classic original work of "Dafeng Nightwatchman"!
The latest novel in the urgent storm collection
His works include "China's Secret Telegram Code" and so on, but his latest novel was not found. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Who sang the pop song 2018 Japanese singer?
In 2018, there were many Japanese singers who sang. For example, Mystique Master Yonezu sang " Lemon " and Da Punch sang " U.S.A." Sakasaka46 sang "Burasakure!" Daoko x Mystical Master Yonezu sang " The Flower Fire," Hoshino Yuan sang " Duo La E Mo," and Nokizaka46 sang " Se Ni Si Te " and "!" Suga Masaki sang "ー" and other songs. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The Wind Chaser's novel is recommended by my favorite works.
Some of Junhua's works could be recommended, such as "Master of Regret", which was Junhua's last article in Jinjiang. The story revolved around Qiao Xiaocheng's first interview with her ex-boyfriend after graduating from university. It was about the female protagonist, as a master of regret, helping people reverse the stupid things they had done, but she needed the other party to prepare the money. There was also "The First Pet," which was an ancient novel about Xianxia cute pets. In the early stages, the female protagonist's behavior as a dog was very realistic and funny, but in the later stages, the male protagonist's setting and plot were a little difficult to wrap up. In addition,"The Lord's Respect/The Windchaser" was also once written by Junhua. It told the story of a transmigrator making a living under the imperial power. The plot of the female protagonist in the early stage was interesting when she became a writing god in ancient times. The later stage of the story reflected the situation of human life in society at that time. The novel was meaningful and had a discussion of human nature. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Is the Phantom of Transformers dead?
In " Transformers: The Rise of the Super Warriors ", it was revealed that the " Phantom " who fought the " plague " to the brink of death was still alive and would continue to extend the brotherhood between Transformers and humans. " Transformers: Origins " was not enough. Everyone, please click to read the novel!
A dazzling array of replacement words
The words "dazzling array" were similar to the words "resplendent and beautiful". The novel " Glittering Four Seasons " is equally exciting. Everyone is welcome to click and read it!
This Killer Is Not Too Cold
The movie had two versions, 110 minutes and 133 minutes. Watching Léon: The Assassin wasn't satisfying enough. Everyone is welcome to click to read the novel!