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2 years ago

Who developed the first scientific atomic theory?

Chemistry

1 answer:

Annette [7]2 years ago

7 0

Answer:

John Dalton

Explanation:

John Dalton (1766-1844) is the scientist credited for proposing the atomic theory. This theory explains several concepts that are relevant in the observable world.

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Which graph should be used to describe the

Tasya [4]

A I think that a bar graph would best represent this information.

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4 years ago

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Name each of the following species for the following acid-base reactions. (The equilibrium lies to the right in each case, i.e.,

DaniilM [7]

Answer: a) $H_3O^++CH_3O^-\rightleftharpoons CH_3OH+H_2O$

acid : hydronium ion

base : methoxide ion

conjugate acid : methanol

conjugate base: water

b) $CH_3CH_2O^-+HCl\rightleftharpoons CH_3CH_2OH+Cl^-$

acid : hydrogen chloride

base : ethoxide ion

conjugate acid : ethanol

conjugate base: chloride ion

c) $NH_2^-+CH_3OH\rightleftharpoons NH_3+CH_3O^-$

acid : methanol

base : amide ion

conjugate acid : ammonia

conjugate base: methoxide ion

Explanation:

According to the Bronsted-Lowry conjugate acid-base theory, an acid is defined as a substance which looses donates protons and thus forming conjugate base and a base is defined as a substance which accepts protons and thus forming conjugate acid.

The species accepting a proton is considered as a base and after accepting a proton, it forms a conjugate acid.

The species losing a proton is considered as an acid and after loosing a proton, it forms a conjugate base

For the given chemical equation:

a) $H_3O^++CH_3O^-\rightleftharpoons CH_3OH+H_2O$

acid : hydronium ion

base : methoxide ion

conjugate acid : methanol

conjugate base: water

b) $CH_3CH_2O^-+HCl\rightleftharpoons CH_3CH_2OH+Cl^-$

acid : hydrogen chloride

base : ethoxide ion

conjugate acid : ethanol

conjugate base: chloride ion

c) $NH_2^-+CH_3OH\rightleftharpoons NH_3+CH_3O^-$

acid : methanol

base : amide ion

conjugate acid : ammonia

conjugate base: methoxide ion

3 0

3 years ago

What type of decay characterizes the change of radioactive nuclides to their respective daughter products?

tigry1 [53]

I believe the correct answer is the second option. The type of decay that characterizes the change of nuclides to their respective daughter products would be exponential decay. This type of decay is characterized by the decrease of quantity of a material according to the equation y=ab^x.

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3 years ago

a molecule of two nitrogen atoms and four oxygen atoms what is the molecule formula for this compound

kiruha [24]

The formula would be N2O4

6 0

3 years ago

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How many molecules of CF₂Cl₂ are in 45.7 grams of CF₂Cl₂? (Show work)

posledela

Answer:

The answer to your question is: 2.20 x 10 ²³ molecules

Explanation:

Data

mass = 45.7 g

molecules of CF₂Cl₂ = ?

Process

1.- Calculate the mass number of CF₂Cl₂

C = 12 F =2 x 19 Cl = 2 x 35.5

total = 12 + 38 + 71

total = 121 g

2.- Use the Avogradro's number to solve the problem

121 g ------------------- 6.023 x 10²³ molecules of CF₂Cl₂

45.7 g --------------- x

x = (45.7 x 6.023 x 10²³) / 121

x = 2.75 x 10²⁵ / 121

x = 2.20 x 10 ²³ molecules

4 0

3 years ago