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marysya [2.9K]
3 years ago
5

You were tasked to check if the liquid sample you have is substance or a mixture.which among these tests is the BEST way to do s

o?
I.COLOR COMPARISON
II.TASTE COMPARISON
III.BOILING POINT TEST
IV.MELTING POINT TEST


A. 1,2,3,4
B. 1,2,3 ONLY
C.1,2,4 ONLY
D.1 AND 3 ONLY
Chemistry
1 answer:
mr Goodwill [35]3 years ago
7 0
D. 1 and 3 only because you never taste, and a liquid cannot melt
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All the members of this family (inner transition metals) are both ______________ and _____________.
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3 years ago
When 125.0 g of ethylene (C2H4) burns in 60.0 grams of oxygen to give carbon dioxide and water, how many grams of CO2 are formed
gizmo_the_mogwai [7]

Answer:

             66 g of CO₂

Solution:

The Balance Chemical Reaction is as follow,

                             C₂H₂  +  5/2 O₂    →    2 CO₂  +  H₂O

Or,

                             2 C₂H₂  +  5 O₂    →    4 CO₂  +  2 H₂O    -------  (1)

Step 1: Find out the limiting reagent as;

According to Equation 1,

            56.1 g (2 mole) C₂H₂ reacts with  =  160 g (5 moles) of O₂

So,

                  125 g of C₂H₂ will react with  =  X g of O₂

Solving for X,

                      X =  (125 g × 160 g) ÷ 56.1 g

                      X =  356.5 g of O₂

It means for total combustion of Ethylene we require 356.5 g of O₂, but we are only provided with 60.0 g of O₂. Therefore, O₂ is the limiting reagent and will control the yield.

Step 2: Calculate Amount of CO₂ produced as;

According to Equation 1,

              160 g (5 mole) O₂ produces  =  176 g (4 moles) of CO₂

So,

                  60.0 g of O₂ will produce  =  X g of CO₂

Solving for X,

                      X =  (60.0 g × 176 g) ÷ 160 g

                      X =  66 g of CO₂

8 0
3 years ago
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