CHEMISTRY MIDDLE SCHOOL

Which term identifies a type of organic reaction?(1) deposition (3) esterification
(2) distillation (4) sublimation

Answers

Answer 1
Answer: The answer is (3) esterification. Note that deposition, distillation and sublimation are not chemical changes, they are physical changes, so you can solve this question by elimination if you know that. Regarding sterification it is a well known chemical reaction that consists on the formation of esters from carboxilic acids.
Answer 2
Answer:

Answer:

(3) esterification

Explanation:

1) Deposition is a process in which a vapor directly condenses into a solid. It is the reverse of sublimation and therefore a process which involves a physical/phase change.

2) Distillation is a process in which a liquid mixture is separated based on the differences in their boiling points. This is a physical separation and not any form of a chemical change.

3)Esterification is an organic reaction in which a carboxylic acid is treated with an alcohol to form an ester.

4) Sublimation is again a physical/phase change process in which a solid gets converted into a gas.

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How does a metallic bond differ from an ionic bond

Answers

A metallic bond is held together by electrostatic forces of interaction, while an ionic bond is held together by electrostatic forces of attraction by oppositely charged cations and anions. The ionic bond has one atom donate electrons to become positively charge while the other atom receives electrons and becomes negatively charged. The opposite charges then attract one another to create the electrostatic force of attraction. In contrast, the electrons in a metallic bond are delocalised, then the nucleus attracts this free moving electrons to establish electrostatic forces of interaction. The structure shows positive charge surrounded by negative charge.

What effect does observing a substance's physical properties have on the substance?

Answers

There is no effect. When you observe a substance's physical properties, you're not doing anything that would catalyze a chemical change. For example, you most often observe with your eyes, and/or, if safe, you waft the substance's smell to your nose. Neither of these observations will effect the substance's physical properties.

Why is no dew formed on a windy day or when the sky is cloudy?

Answers

Dew forms when the air just above the ground is cooled to its dew point. The air above the ground is cooled because the ground radiates heat into space. If there are clouds overhead the clouds reflect the heat back to the ground so it does not cool and o dew forms. If it is windy then the air just above the ground to the dew point and no dew forms. Thus to form dew you need a still clear keeps on getting mixed with the air higher up and the air does not cooled to the dew point and no dew forms. 

What is the ratio of atoms in carbon dioxide , or CO2

Answers

the formula shows the ratio of atoms. CO2. it shows that for each atom of Carbon. there are 2 oxygen atoms so the ratio is 1:2

8. What is the heat of reaction when hydrogen and oxygen combine to form water?2H2(g) + O2(g) → 2H2O(1)
(AHC H20(I) = -285.8 kJ/mol)
A -120.9 kJ
B-241.8 kJ
C-571.6 kJ
D-285.8 kJ

Answers

Answer:

The heat of reaction when hydrogen and oxygen combine to form water is :

C. 571.6 kJ

Explanation:

Enthalpy Change = The enthalpy change for the formation of 1 mole of the substance from their standard state is called the enthalpy of formation.

This is intensive quantity as it is fixed for 1 mole .

Intensive properties = Those properties which are independent on the amount of the substance are intensive properties.

The value of these quantities does not get halve if you divide the substance into two equal parts. example , density, refractive index.

However , the enthalpy of reaction is extensive. Because on increasing the amount the value of the enthalpy also get doubles

Hence for this reaction :

2H_(2)(g)+O_(2)\rightarrow 2H_(2)(l)

Its value is -285.8 kJ for 1 mole

And here two moles are present . so the value of molar enthalpy is:

-285.8 x 2 = -571.6 kJ

flight of a bald eagle is about 50 km a scientist measured an eagle flying 80 km how is this possible

Answers

The AVERAGE flight of a bald eagle is 50 km/h. so that means it can go higher or lower than that speed. it's not that it can only go a maximum of 50 km/h 
Hope this helps. :)
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