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3 years ago

According to Dalton's atomic theory:

Chemistry

1 answer:

miv72 [106K]3 years ago

3 0

Answer:

An atom cannot be subdivided into smaller particles. (Option A).

Explanation:

According to Dalton's atomic theory: All matter is composed of tiny particles called as atoms. Some postulates of this theory are given below:

1) An atom cannot be subdivided into smaller particles it means they are indivisible.

2) Different element atoms have different masses, and chemical properties.

3) All atoms which are present in an element are identical in all respects such as mass, chemical properties, etc.

4) Atom cannot create or destroyed in a closed system.

5) The types of atoms, and relative number are constant in a given compound.

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What is true about the valence shell of the noble gasses?

lana [24]

Answer:

The valence shell of noble gases has all 8 valence electrons which means it is full.

Explanation:

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4 years ago

Susan was frantic: the small diamond had disappeared from her wedding ring! It had been there this morning, before she made brea

Bezzdna [24]

Answer:

No. 1 Susan was Frantic

No.2 panicked

No.3 determined

No.4 Despair

No.5 Releif

I really hope this helps, Good luck! :D

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3 years ago

A 50.00-mL solution of 0.0350 M aniline ( Kb = 3.8 × 10–10) is titrated with a 0.0113 M solution of hydrochloric acid as the tit

nexus9112 [7]

Answer:

pH = 3.70

Explanation:

Moles of aniline in solution are:

0.0500L × (0.0350mol / 1L) = 1.750x10⁻³ mol aniline

Aniline is in equilibrium with water, thus:

C₆H₅NH₂ + H₂O ⇄ C₆H₅NH₃⁺ + OH⁻ Kb = 3.8x10⁻¹⁰

HCl reacts with aniline thus:

HCl + C₆H₅NH₂ → C₆H₅NH₃⁺ + Cl⁻

At equivalence point, all aniline reacts producing C₆H₅NH₃⁺. C₆H₅NH₃⁺ has its own equilibrium with water thus:

C₆H₅NH₃⁺(aq) + H₂O(l) ⇄ C₆H₅NH₂(aq) + H₃O⁺(aq)

Where Ka is defined as:

Ka = [C₆H₅NH₂] [H₃O⁺] / [C₆H₅NH₃⁺] = Kw / Kb = 1.0x10⁻¹⁴ / 3.8x10⁻¹⁰ = 2.63x10⁻⁵ (1)

As all aniline reacts producing C₆H₅NH₃⁺, moles in equilibrium are:

[C₆H₅NH₃⁺] = 1.750x10⁻³ mol - X

[C₆H₅NH₂] = X

[H₃O⁺] = X

Replacing in (1):

2.63x10⁻⁵ = [X] [X] / [1.750x10⁻³ mol - X]

4.6x10⁻⁸ - 2.63x10⁻⁵X = X²

0 = X² + 2.63x10⁻⁵X - 4.6x10⁻⁸

Solving for X:

X = -2.3x10⁻⁴ → False answer, there is no negative concentrations

X = 2.0x10⁻⁴ → Right answer

As [H₃O⁺] = X, [H₃O⁺] = 2.0x10⁻⁴.

Now, pH = -log[H₃O⁺]. Thus, pH at equivalence point is:

pH = 3.70

7 0

3 years ago

Why do you think large differences in temperature between the wet bulb and dry bulb thermometers are possible only at higher tem

olganol [36]

Answer:

This is the temperature indicated by a moistened thermometer bulb exposed to the air flow. The evaporation is reduced when the air contains more water vapor. The wet bulb temperature is always lower than the dry bulb temperature but will be identical with 100% relative humidity.

Explanation:

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3 years ago

Determine if the phrases below are true for catabolic pathways only, anabolic pathways only,or can apply to both pathways, by so

Ivan

Answer:

Catabolic pathways;

Pathway produces more ATP than it consumes

Supplies NADH for oxidative phosphorylation

Anabolic pathways only:

Consumes more ATP than it produces

Can require reducing agent

Both pathways;

At least one enzyme is regulated

All reactions are catabolized by enzymes

One or more reactions are endergonic without ATP

Explanation:

Catabolic pathways;

Complete oxidation of glucose and then produces more ATP. Oxidative phosphorylation is an example of catabolic pathway.

From the given following conversions are considered as catabolic pathways.

Pathway produces more ATP than it consumes

Supplies NADH for oxidative phosphorylation

Anabolic pathways:

Anabolic pathways produces new molecules and it requires energy in the form of ATP for the formation of new bonds.

From the given following conversions are considered as anabolic pathways.

Consumes more ATP than it produces

Can require reducing agent.

Both pathways;

Metabolic pathways are occuring in the cell only few enzymes are regulate these pathways.

At least one enzyme is regulated

All reactions are catabolized by enzymes

One or more reactions are endergonic without ATP

6 0

4 years ago