Just to be more sure of the cleanliness of the floor they pray upon. It is not a religious obligation.
It is called rag or "Sejjadah"
A Muslim can pray on any colour provided it is clean, and not made of silk or Gold.
The mats that the Muslims use for worship are called prayer mats. In the Islamic culture, the name for the prayer mat is sajjada.
Muslims DO NOT PRAY TO MOHAMMAD (peace be upon him),Muslims pray to ALLAH.
Muslims pray in mosques.
No, Muslims pray at 5 times a day: dawn, noon, afternoon, sunset, evening. Muslims do not pray while sleeping.
in the Pray hall
in the Pray hall
Muslims are ordered to pray directly to ALLAH without any human or spiritual intermediaries. Muslims do not pray to anyone but ALLAH and they do so directly. An Imam may lead the prayers, but he does not pray on behalf of the others, to each his own prayer.
Muslims face towards the Kaaba in Mecca when they pray.
Graveyard. On the grave or on the tombstone. Muslims do not worship people in graves. Also, Muslims can not pray on top of Kabah. You can pray inside it but not on top of it.
Muslims are not allowed to pray in whether it is a chapel or church. Muslims pray facing Qibla which is in Mecca.