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chemistry

Ameyelshrkawy

منذ 6 سنوات

اجابة 1 مشاهدة 23

9. Calculate the mass of hydrogen formed when 25 grams of aluminum reacts with an excess amount of hydrochloric acid.

$2Al + 6HCl\rightarrow AL_{2}Cl_{6}+3H_{2}$

$(AL=27, H= 1 , Cl=35.5)$

A. 0.41 g

B. 1.2 g

C. 1.8 g

D. 2.8 g

10. If 5.0 g of each reactant were used for the following process:

$2KMnO_{4} + 5Hg_{2}Cl_{2} + 16HCl\rightarrow 10HgCl_{2} + 2MnCl_{2}+ 2KCl+8H_{2}O$

The limiting reactant would be:

A. $kMnO_{4}$

B. HCl

C. $H_{2}O$

D. $Hg_{2}Cl_{2}$

11. In the equation: $HF + H_{2}O \rightarrow H_{3}O^{+} + F^{-}$

A. $H_{2}O$ is a base and HF is its conjugate acid.

B. $H_{2}O$ is an acid and HF is the conjugate base.

C. HF is an acid and $F^{-}$ is its conjugate base.

D. HF is a base and $H_{3}O^{+}$ is its conjugate acid.

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Ameyelshrkawy

منذ 6 سنوات

اجابة 1 مشاهدة 38

You have got four conical flasks, each of them contains 500 ml of water and an amount of sugar as follow:

flask 4	flask 3	flask 2	flask 1
0.5 g	450 g	250g	150g

Which flask contains a saturated solution?

A. Flask 1

B. Flask 2

C. Flask 3

D. Flask 4

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