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3 years ago

The modern atomic model is sometimes called the ________ or quantum mechanics model

Chemistry

2 answers:

Ksivusya [100]3 years ago

7 0

THE answer is D is correct

Marat540 [252]3 years ago

4 0

I believe the correct answer from the choices listed above is option D. The modern atomic model is sometimes called the electron cloud or quantum mechanics model. It <span>uses complex shapes of orbitals (sometimes called electron clouds), volumes of space in which there is likely to be an electron. </span>
Hope this answers the question. Have a nice day.

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What is the mass of a metal block with a volume of 3.1cm3 and a density of 3.82 g/cm3

zepelin [54]

Answer:

11.842g

Explanation:

To find mass the formula is volume times density.

4 0

4 years ago

Calculate the % dissociation of 0.10 M solution of acetic acid (pKa = 4.75)

madreJ [45]

Given :

Molarity of acetic acid solution, M = 0.10 M.

pKa of acetic acid, pKa = 4.75 .

To Find :

Percentage dissociation of 0.10 M solution of acetic acid.

Solution :

We know, $pK_a = -log\ K_a$

Taking antilog both side, we get :

$K_a = 1.78\times 10^{-5}$

Since, acetic acid has 1 hydrogen atom to loose , so it is a monoprotic acid.

Now, percentage dissociation of monoprotic acid is given by :

$\alpha = \sqrt{\dfrac{K_a}{C}}\\\\\alpha =\sqrt{ \dfrac{1.78\times 10^{-5}}{0.1}}\\\\\alpha = 0.0133\times 100 = 1.33 \%$

Hence, this is the required solution.

3 0

3 years ago

The pH of a solution is 2.0. Which statement is correct?

Natalka [10]

Answer:

The relationship of pH and concentration of H+ ion is pH = -lg[H+]. So the concentration of H+ is 10^(-2). And [OH-][H+]=10^(-14). pOH + pH = 14. So the right answer is A.

6 0

3 years ago

Read 2 more answers

Lead (II) carbonate decomposes to give lead (II) oxide and carbon dioxide: PbCO 3 (s) PbO (s) CO 2 (g) ________ grams of lead (I

blsea [12.9K]

Answer:

We will have 7.30 grams lead(II) oxide

Explanation:

Step 1: Data given

Mass of lead (II)carbonate = 8.75 grams

Molar mass PbCO3 = 267.21 g/mol

Step 2: The balanced equation

PbCO3 (s) ⇆ PbO(s) + CO2(g)

Step 3: Calculate moles PbCO3

Moles PbCO3 = mass / molar mass

Moles PbCO3 = 8.75 grams / 267.21 g/mol

Moles PbCO3 = 0.0327 moles

Step 4: Calculate moles PbO

For 1 mol PbCO3 we'll have 1 mol PbO and 1 mol CO2

For 0.0327 moles PbCO3 we'll have 0.0327 moles PbO

Step 5: Calculate mass PbO

Mass PbO = moles PbO * molar mass PbO

Mass PbO = 0.0327 moles * 223.2 g/mol

Mass PbO = 7.30 grams

We will have 7.30 grams lead(II) oxide

7 0

4 years ago

Density differences in different materials are able to change the of a wave. A)Amplitude B)Crest C)Speed D)Trough

Maurinko [17]

Answer:

C. Speed

Explanation:

Density differences in different materials are able to change the speed of a wave.

Wave speed is dependent on the frequency and wavelength of a wave.
As a wave travels from one medium to another, the speed of the wave changes.
Speed of a wave is medium dependent.
The denser a medium, the slower the speed of waves will be be.
A less dense medium will have waves traveling through faster.

6 0

3 years ago

Read 2 more answers