I don't suppose this will come as a surprise to anyone but in case anyone is interested:

This morning I was out flying a C172 around in smooth air and I took a few measurements.

I trimmed for 90 knots in level flight with flaps up and zeroed out the attitude indicator. Then I took my hand off the yoke and quickly extended 10 degrees of flaps. The plane pitched up to 35 degrees, then stalled and recovered. I did this twice with the same results.

Then I did the same thing except I forced the airplane to maintain altitude. When the airspeed stabilized again, I was going 83 knots, and the pitch attitude was 3 degrees nose low. I did not change the power setting. Naturally, if I had increased power (airspeed), I would have had to decrease the pitch attitude further, and conversely if I had reduced power, I would have had to raise the nose to maintain altitude.

Then I extended full flaps (30 degrees). Initially of course I had to lower the nose to around 5 degrees below horizon to keep from climbing, but as the speed decreased to and stabilized at 62 knots, (again without changing the power setting), the pitch attitude was again at the same pitch attitude as at 90 knots with flaps up.

At 62 knots with flaps up, maintaining altitude, the nose is much higher than it is with the flaps extended, and of course requires much less power.