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3 years ago

Please help I will mark you brainiest

Chemistry

1 answer:

leonid [27]3 years ago

7 0

Answer:

Ethylene glycol is a syrupy liquid at room temperature whereas polyethylene glycol is a solid material. The main difference between ethylene glycol and polyethylene glycol is that ethylene glycol has a fixed value for molecular weight whereas polyethylene glycol has no fixed value for molecular weight.

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During a solvent extraction, a student lost track of which layer was the aqueous layer and which layer was the organic layer. Wh

KatRina [158]

Answer:

a. add a little distilled water to see which layer the water adds to

Explanation:

The problem tells us to keep in mind two major aspects of the test: It has to be <em>simple</em>, as well as <em>non-destructive</em>:

Adding distilled water can be made in under a minute, without requiring specialized laboratory equipment, unlike IR.
It is also non-destructive, because the contents on either layer won't change due to the added distilled water.

4 0

3 years ago

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Given that a chlorine-oxygen bond has an enthalpy of 243 kJ/mol , an oxygen-oxygen bond has an enthalpy of 498 kJ/mol , and the

Alecsey [184]

Explanation:

The chemical equation is as follows.

$\frac{1}{2}Cl_{2}(g) + \frac{1}{2}O_{2}(g) \rightarrow ClO(g)$

And, the given enthalpy is as follows.

$\frac{1}{2}Cl_{2}(g) + O_{2}(g) \rightarrow ClO_{2}(g)$ ; $\Delta H$ = 102.5 kJ

Cl-Cl = 243 kJ/mol, O=O = 498 kJ/mol

Since, the bond enthalpy of Cl-Cl is not given so at first, we will calculate the value of Cl-Cl as follows.

$\Delta H = \sum \text{bond broken in reactants} - \sum \text{bond broken in products}$

102.5 = $[(\frac{1}{2})x + 498] - [(2)(243)]$

102.5 = $(\frac{1}{2})x + 498 - 486$

102.5 - 12 = $\frac{x}{2}$

x = 181 kJ

Now, total bond enthalpy of per mole of ClO is calculated as follows.

$\Delta H = \sum E(\text{bond broken in reactants}) - \sum (\text{bond broken in products})$

x = $[(\frac{1}{2})181 + (\frac{1}{2})498] - 243$

= 339.5 - 243

= 96.5 kJ

Thus, we can conclude that the value for the enthalpy of formation per mole of ClO(g) is 96.5 kJ.

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3 years ago

Minerals with the silicon-oxygen structure shown in Figure 2-1 are classified into what group?

egoroff_w [7]

B----------- oxide is the correct answer

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3 years ago

Which is greater, the moons period of rotation or its period of revolution?

balu736 [363]

C. they are equal

This is because it takes about the same amount of time for the moon to rotate around its axis that it does to rotate around the Earth.

3 0

3 years ago

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H2SO4 + Ba(OH)2à BaSO4 + H2O is an unbalanced chemical equation. What is the coefficient for sulfuric acid (H2SO4) when this equ

Ivanshal [37]

H₂SO₄ + Ba(OH)₂ -----> BaSO₄ + 2H₂O

Coefficient for sulfuric acid: 1

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2 years ago

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