Yes Chelsea have really done well in their recent games this season but it will be very difficult for them to win arsenal. Arsenal is in a good firm and dangerous this season. Arsenal meeting with Chelsea is an important game to arsenal that if winning it will lead them having more points and to be at the top of the game, so I don't think this will be a game arsenal would want to lose. It will be Interesting seeing Chelsea performing with their new quality but may not be possible for them to win.
Chelsea did perform well in the last 2 matches in the Premier League and they won, but those were matches against lower-class teams, different from Arsenal.
Arsenal's team this season is very strong and they have just beaten Manchester City which will definitely increase the confidence and mentality of this team.
So in my opinion it is very likely that Arsenal will win this match and I even predict that Arsenal will win with a big score.

looking at the tempting Odds of course I will bet on Arsenal completely because Arsenal has performed well so far in the English league and has not received a defeat at all, losing against Lens is a bad thing even though in fact we don't know the potential of the Lens club in league 1 so they can beat Arsenal in the Champions League match.
The Chelsea vs Arsenal match will certainly be a fairly easy match for Arsenal knowing Chelsea's current condition is not good, and I am sure Arsenal will get full points in that match.
I agree with you, and in my opinion Odds @ 2.17 is very tempting for the possibility of a fairly large win.
I will not miss this match to bet on and in fact I plan to bet a large amount on Arsenal winning.
I think my great confidence in Arsenal's victory is very natural because the Arsenal team is currently in top form, in contrast to the Chelsea team which so far has not performed optimally (even though it has managed to win in its last 2 matches).