Các dung dịch: NH 3 , FeCl 3 , Na 2 S lần lượt làm quỳ tím hóa màu: A.

xanh – đỏ – đỏ
B.

xanh – đỏ – xanh
C.

xanh – xanh – đỏ
D.

đỏ – xanh – đỏ

The ph of carrots are 5.0 how it is classified a.acidic b.basic c.indicator d.neutral

Acalorimeter is to be calibrated: 51.203 g of water at 55.2 degree c is added to a calorimeter containing 49.783 g of water at 23.5c. after stirring and waiting for the system to equilibrate, the final temperature reached is 37.6 degree c. specific heat capacity of water (s = 4.18 j/g∙degree c). calculate the calorimeter constant. (smδt)warm water = -[(smδt)cold water + (calorimeterδtcold water)]

Does the number of ions in solution increase, decrease, or remain constant? it continuously decreases. it continuously increases. it decreases at first, then increases. it increases at first, then decreases.