【单选题】在NH3.H2O溶液中,加入少量NH4Cl溶液,溶液的pH值将 ( )。
【单选题】下列离子方程式书写正确的是( )
A.
在Fe(OH) 3 中加入HI溶液:Fe(OH) 3 +3H + ═Fe 3+ +3H 2 O
B.
在稀氨水中通入少量CO 2 :NH 3 ?H 2 O+CO 2 ═NH 4 + +HCO 3 -
C.
向澄清石灰水中加入足量NaHCO 3 溶液:Ca 2+ +OH - +HCO 3 - ═CaCO 3 ↓+H 2 O
D.
在酸性KMnO 4 溶液中加入H 2 O 2 :2MnO 4 - +5H 2 O 2 +6H + ═2Mn 2+ +5O 2 ↑+8H 2 O
【简答题】(8分)化学平衡移动原理同样也适用于其他平衡,已知在氨水中存在下列平衡: NH 3 +H 2 O===NH 3 .H 2 O===NH 4 + +OH - (1)向氨水中加入MgCl 2 固体时,平衡向______________移动,OH - 的浓度_______, NH 4 + 的浓度_______。 (2)向氨水中加入浓盐酸,此时溶液中浓度减小的微粒有_______、_______、____...
【简答题】Make a dialogue: How does a cabin attendant make a self-introduction to the passengers?
【简答题】A.用氨水吸收少量SO 2 气体:2NH 3 ·H 2 O+SO 2 =2NH 4 + +SO 3 2- +H 2 O B.NaHSO 4 溶液中滴入Ba(OH) 2 溶液至中性:H + +SO 4 2- +Ba 2+ 十OH - ===BaSO 4 ↓+H 2 O C.在H 2 O 2 中加入酸性KMnO 4 溶液:2MnO 4 - +5H 2 O 2 +6H + ====2Mn 2+ +5O ...
【多选题】The following scenario relates to questions 82 - 86 Your audit firm Cal & Co has just gained a new audit , Tirrol Co, in a tender in which Cal & Co offered competitively low audit fees. You are ...
A.
We should budget for the extra time required to document an understanding of the entity, its environment and its systems, and to verify material opening balances.
B.
Given the tight reporting deadline, a combined approach should be adopted on the audit, relying on tests of controls wherever possible.
C.
We must agree a clear timetable with the for the testing of the computerized inventory systems, setting out availability of access to the system, files and personnel required to complete testing.
D.
As this is our first year of audit, we should agree separate fees with the for any additional audit procedures required. If the refuses, we should consider withdrawing from the audit as Cal & Co would be deemed to be lowballing.
【单选题】下列离子方程式正确的是 [ ]
A.
向NH 4 HSO 4 溶液中滴加少量的Ba(OH) 2 溶液:Ba 2+ +2OH - +NH 4 + +H + == BaSO 4 ↓+NH 3 ·H 2 O+H 2 O
B.
向漂白粉溶液中通入过量的SO 2 气体:ClO - +SO 2 +H 2 O== HSO 3 - +HClO
C.
向偏铝酸钠溶液中通入少量CO 2 气体:AlO 2 - +CO 2 +2H 2 O== Al(OH) 3 ↓+HCO 3 -
D.
海水中的Fe 2+ 在铁细菌的催化下被氧化成Fe 2 O 3 :4Fe 2+ +8OH - +CO 2 ==2Fe 2 O 3 +HCHO+3H 2 O
【单选题】事业单位从财政国库取得的预算资金属于 ( )。
【单选题】常温下,对下列各溶液的叙述不正确的是( )
A.
CH 3 COONa溶液中:c(OH - )=c(H + )+c(CH 3 COOH)
B.
在pH=8的NaF溶液中,c(Na + )-c(F - )=9.9×10 -7 mol/L
C.
pH=2的盐酸与pH=12的Ba(OH) 2 溶液等体积混合后,溶液中一定有c(H + )=c(OH - )
D.
向0.1mol/L氨水中加入少量NH 4 Cl固体,溶液中c(OH - )/c(NH 3 ?H 2 O)增大
【单选题】下列离子方程式书写正确的是
A.
在Fe(OH) 3 胶体中加入HI溶液:Fe(OH) 3 + 3H += Fe 3+ + 3H 2 O
B.
在稀氨水中通入少量SO 2 :NH 3 ?H 2 O+SO 2= NH 4 + +HSO 3 -
C.
向澄清石灰水中加入足量NaHCO 3 溶液: Ca 2+ + OH - +HCO 3 -= CaCO 3 ↓+ H 2 O
D.
在酸性KMnO 4 溶液中加入H 2 O 2 : 2MnO 4 - +5H 2 O 2 + 6H + =2Mn 2+ +5O 2 ↑+ 8H 2 O