It does matter if they play at home or not. If Chelsea were to play this game away against Arsenal, I think it would almost be certain that Arsenal would win the game, but since this isn't a home game for Arsenal, I think that it is possible for Chelsea to play a better game than they would otherwise. Whether that is enough for a win for them, I don't know. But playing in front of their own fans is at least supposed to be a different atmosphere for them that should help them to put more effort into that game.
Play home or away its not really difference atmosphere for Chelsea because last winning match from away when defeating Burnley, but Arsenal opponent is difference than Burnley with consistency performance and they have more confidence after last match before international break out success beaten defending champion of Premier League teams Manchester City.
Chelsea is rarely winning the game once it was playing at home. It has proven when this club was losing even against nottingham forest. Arsenal is in a huge advantage here caused by the club is coming with a very strong squad unlike chelsea which is having tons of problem in the club and its players.
Im doubting chelsea to win the game. It's such a miracle if chelsea will able to beat arsenal even with small score. Many competitors are also counting on chelsea caused by beng able to take three points from arsenal will be helping a lot for manchester city.
People lack of confidence in chelsea and this is a common thing since chelsea was always playing so garbage in the previous games. We will see that whether chelsea is trying to comeback again or it will have clown performance like last season.
Otherwise, Arsenal have more motivate take first position standings from other London team Tottenham Hotspur, have the same points with lack goals productive I think three points against Chelsea will move to the first position place for awhile due Tottenham Hotspur vs Fulham will play on Tuesday.
There are some motivations owned by arsenal to win this game. To make the gap to the city becomes even bigger, keep unbeating record, add chances to win the EPL title this season.
It's all have been motivating arsenal to win the game and that's it. I don't see other reason.