Time

If you really repent and decide not to do it again, then you feel weak and commit the sin again, it does not mean Nifaaq (hypocrisy).

You need to strengthen your will power and your remembering and fearing Good, to be able to avoid the sin.

Wassalam.

Monopoly of food required by people is not allowed in Islam. If the items of food are not required in people daily life and keeping it in storage does not harm general public, then can be permissible but if keeping it is storage harms people in anyway, then it is not allowed at all.

Wassalam.

If he is sure that he touched the item which was in fact Najis, with a wet hand or the item was wet, then his hand became Najis even if he was unaware that it was Najis when he touched it. If he is not sure that his hand was wet or the item was wet when was touched by him, then his hand is Najis. Same also is the rule for other items touched by him later on whether he was sure that his hand was wet or the item itself was wet when it was touched by his Najis hand.

Wassalam.

The prayer will not be invalid but it is always better to keep our intention concentrated in our Prayers during performing Salah.

Wassalam.

Khums is obligatory on everything you lawfully own, on the date of your Khums, if it is not in use for your day to day life requirements. There is Khums on items you have purchased and started using like jewelry, clothes, car, house where you live, etc.

Wassalam.

Slavery rules were never started by Muslims but were already existing in different societies of the time when Islam came. Slavery rules are an outcome of wars. Islamic rules aimed to diminish slavery and finish it off. Slavery rules can not be taken as permanent rules for life but only in war and after war under many conditions.

Slave female from war between Nin Muslims against Muslims is not like a full wife of the owner who has the full rights of justice between her and other wife and inheritance from her husband. When the Muslims marries his owned female (Aman), she will then have all rights if the wife. With out marriage, she is called Sariyyah.

Wassalam.

Mut'ah is a time fixed Islamic marriage which ends automatically on the end of the agreed time. Both can renew the Mut'ah by reciting another Mut'ah contract with a Mahr and a new period of time if they wish. 
'Wassalam.

We must perform every obligatory Prayer on its time and never delay it till its time goes away. If you did not pray your Dhuhr Prayer, you must perform it before performing your ASR Prayer. Dhikr is highly recommended after every obligatory Prayer. Tasbeeh of Fatima (SA) is highly recommended after every Prayer and it is more beloved to Allah (SWT) than one thousand recommended Rak'ats, according to Hadeeth from Imam Ja'far Al-Sadiq (AS). Reciting Ayatul Kursi is also highly recommended after prayers.

Wassalam.

Fasting starts from Fajr and ends on Maghrib.

Wassalam,

No. She must observe the waiting period (Iddah) after the end of the Mut'ah fixed time. The Iddah time required is two menstrual periods.

Wassalam.

It is obligatory to perform every obligatory Prayer on its time and ir us sinful to deliberately miss any obligatory Prayer. We must make every possible arrangement to perform our obligatory Prayers on time and never miss any of them.

We need to organize our sleeping time to be able to get up and perform our obligatory Prayers.

We might use an alarm or request some one to wake us up for obligatory Prayers.

Wassalam.