Salam alaykum!
laughing loudly in islam is not allowed specially for a women ?
Wa'alaikuma s'salaam,
People laugh all the time. I don't think there is anything with it, only thing frowned upon is too much laughing. But a Muslim women should be firm with her voice when outside or among non-mahram. She can laugh at home among mahram only.
Aaishah, may Allaah be pleased with her, said: “I never saw the Messenger of Allaah (peace and blessings of Allaah be upon him) laughing so heartily that his back teeth showed; he would only smile.” (Reported by Abu Dawood, no. 5098).
According to a saheeh hadeeth, the Prophet (peace and blessings of Allaah be upon him) said: “Do not laugh too much, for excessive laughter kills the heart (i.e., spiritually) .”
(Reported by Ibn Maajah, no. 4193; Silsilah al-Saheehah, no. 506).
According to another report, he said: “… too much laughter corrupts the heart.”
a women should be always covered even a non mahram should not see her hands?
A woman should be properly covered in the presence of a non-mahram. Otherwise she can dress at home in what is normal and comfortable to wear among family. Regarding the hands, there's one hadith that everyone likes to quote that says a women should not show except this and this , referring to the hand and the face. Then there is also niqaab and covering of the hands which scholars say should be covered. You can read more on covering hands here inshallah:
http://islamqa.info/en/ref/45869/
and that when a nn mahram comes after her door to ask something, she must take her hand in front her mouth so that the none mahram should not hear her real voice?
There's a hadith on this but I don't remember if it was referring to the wives of the prophet (s) or women in general, but it stated that when a non-mahram approach, the women would cover their mouth with a cloth to muzzle their voice so it can't be told if it's voice of a young woman or old one. Since i don't have the hadith on me, inshallah you can check out the links below.
Manners when talking to women.
Etiquette of talking to women.
and that wearing pants is not allowed for a muslim girl?
Wearing the pants by themselves is not allowed, not only are they an imitation of the men but they do not provide proper covering per requirement of the shariah. Wearing them under a garment such as an abayah is ok and allowed as they become part of the under garments then. If you had lose pants with a long shirt coming to the knees, some scholars may say it's ok. The islamqa.com site is a conservative site and says its not ok. Anyways, the links below shed more light on this.
Women wearing pants .
Ruling on women wearing pants under a short garment.
Can a woman go out wearing a long shirt with pants beneath?.
while someone is dead if he or she were good and inocent they go to heaven or they remain in their grave till qiyamah?
Only the prophets are located in the 7 heavens. No one is in paradise. Heaven and paradise (jannah) are not the same. Regarding all of us, we stay in the grave. A good soul is shown his or her place in Jannah and their grave is widened and a window from jannah is open into their grave so they can enjoy the warmth and fragrance coming. A evil soul's grave is tightened till their ribs interlock like fingers of the two hands and a window from hell is opened in the grave so they can feel the heat and stuff coming from there.
when someone is thrown in the hell fire and then will be forgived she or he has a sighn that people recongnize that he or she was in the hell first ?
Those that come out of the hell fire will be chard black and then they will be washed in the river of life before going to Jannah. They will bear a mark that will differentiate them from those who went straight to Jannah. It could be the mark of sajood or something else, not sure and couldn't find that particular hadith.
Muslim reports a lengthy hadith from Abu Hurayrah, in which the Prophet (saw) describes the Hereafter, and in which he says: "...When Allah (swt) has finished judging mankind, and wants to bring whomever He wills out of Hell by His Mercy, He will order angels to bring forth those upon who He wishes to bestow His mercy of the people who never associated anything in worship with Allah (swt), and who said, "Laa ilaaha illaah Allah". The angels will recognise them in Hell, and will known them by the mark of sujood on their foreheads. The Fire will consume all of a man except the mark of sujood which Allah (swt) has forbidden the Fire to consume. They will be brought forth, having been burned in the Fire, the water of life will be poured on then, and they will grow like seeds left by still after a flood". [Saheeh Muslim, Kitaab al-Imaan, Baab ar-Ru'yah, 1/299, no. 182]
http://www.islaam.net/main/display.php?id=723&category=101