以下哪种方式能够最快、最简单分辨酸奶和水？

Which one is the fastest and eastest way to distinguish between yogurt and water?

• Touch

• Taste

• Look

• Smell

左侧方程式是正确的复分解反应的是？

Which one is the correct double decomposition reaction?

• A

• B

• C

• D

下列哪个是无氧酸？

Which acid is without Oxygen?

• 氢硫酸

  H2S

• 硫酸

  H2SO4

• 硝酸

  HNO3

• 醋酸

  CH3COOH

下列不属于酸根的是？多选。

Which of the following is not an acid group? More than 1 answer.

• Carbonate

  CO3

• Hydroxide

  OH

• Sulfate

  SO4

• Carbon dioxide

  CO2

下列不属于浓盐酸物理性质的是？

Which of the following does not belong to the physical properties of concentrated hydrochloric acid?

• 酸性

  Acidity

• 挥发性

  volatility

• 无色液体

  Colorless liquid

• 有刺激性气味

  Pungent smell

以下溶液敞口放置在空气中，溶质浓度减少而质量增加的是？

Which of the following solutions is exposed to air, the concentration of the solute decreases and the mass increases？

• 稀盐酸

  Dilute

  Hydrochloric acid

• 浓盐酸

  Concentrated

  Hydrochloric acid

• 稀硫酸

  Dilute

  Sulfuric acid

• 浓硫酸

  Concentrated

  Sulfuric acid

能和酸反应生成盐和水的金属氧化物又可以叫做____________。

以下气体都能够用浓硫酸干燥的是？

Which of the following gases can be dried with concentrated sulfuric acid?

• H2

  NH3

  CO2

• CO

  H2

  CH4

• CO

  NH3

  H2S

• SO2

  NH3

  CH4

人体被蜜蜂叮咬时，蜜蜂会向人体注射一种酸以至于人会感到瘙痒、疼痛。

下列哪种方式可以缓解这种症状？

• 食盐水

• 食醋

• 糖水

• 肥皂水

Please write down the equation.

Al2O3 + H2SO4 → ？？

• Al2(SO4)3 + H2O

• Al2(SO4)3 + 3H2O

• Al2SO4 + 3H2O

• AlSO4 + H2O