Which is a correct comparison between the modern quantum model and John Dalton’s model of the atom?A.The modern model is not as widely accepted by scientists as Dalton’s model.
B. The modern model states that atoms of all elements are identical, whereas Dalton’s model does not.
C. The modern model recognizes particles in the atom, whereas Dalton’s model does not.
D. The modern model does not explain emission spectra, whereas Dalton’s model does.

Answers

Answer 1

Answer:

The modern model recognizes particles in the atom, whereas Dalton’s model does not. The correct option is C.

What is an atom?

An atom is a matter particle that truly represents a chemicalelement. An atom is made up of a central nucleus encircled by one or more electrons.

Each electron carries a negative charge. The nucleus is positively charged and encompasses one or more protons and neutrons, which are relatively heavy particles.

According to current theory, electrons are in orbits all over the nucleus, which is made up of protons and neutrons.

It also indicates that all orbits are not the same and that their structures differ. According to quantumtheory, waves are associated with the properties of matter.

Dalton'smodel does not recognize particles in the atom, whereas the modern model does.

Thus, the correct option is C.

For more details regarding an atom, visit:

brainly.com/question/1566330

#SPJ6

Answer 2

Answer: Depends on your definition of the modern model. The one created by Neils Bohr differs from the quantum mechanical model.

For the Quantum mechanical model, A is untrue. The QM model is far more accepted than Dalton's because it explained the workings of the atom far better than any before.
For the NB model however, that was not accepted as much because it only worked when working with Hydrogen.

B: No model states that each atom is identical.

C: Dalton's model did NOT recognize particles in the atom, but the NB and QM models do.

D: The reverse is true.

So the answer is C.

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The weight of a substance is defined as its mass divided by its volume. Please select the best answer from the choices provided T F

Answers

Answer: The given statement is false.

Explanation:

Weight :It is defined as the measure of force exerted upon the object by the gravity. It is measured in Newtons.

$W=mg$ , where W= Weight , m = mass of the object , g = acceleration due to gravity = $9.8m/s^2$

Here the given statement is False, the correct statement will be:

The density of a substance is defined as its mass divided by its volume.

I would say false :D

Which sample of matter is a mixture?
(1) Br2(ℓ) (3) KBr(s)
(2) K(s) (4) KBr(aq)

Answers

Answer:

KBr (aq) is a mixture.

Explanation:

Mixture is defined as the combination of two non reacting species. Let's discuss each option one by one.

a) Br₂(l):

This Bromine is not a mixture because the bracket specifying the state of Br₂ is liquid. Hence, as bromine is a liquid at room temperature, so this compound is purely Br₂.

b) KBr (s):

KBr is also present in pure form because in bracket solid is written.

c) K (s):

Potassium is also present in pure form as the bracket is specifying solid, as KBr is solid at room temperature.

d) KBr (aq):

This is a mixture of KBr and water. Because KBr being an electrolyte when dissolved in water it is hydrated as follow,

KBr (s) -----water------> K⁺ (aq) + Br⁻ (aq)

$\boxed{\left( {\text{4}} \right){\text{ KBr}}\left( {aq} \right)}$ is a mixture.

Further explanation:

Mixture:

It is formed by the physical combination of two or more different substances. Mixtures do not have any fixed formula and their composition is also variable. There is retention in the properties of constituents even after the formation of mixtures.

(1) ${\text{B}}{{\text{r}}_2}\left( l \right)$

Bromine is present in liquid in its pure state. The “l” written in the parenthesis after denotes its physical state which is the same as that of its pure form. So it is not a mixture.

(2) K (s)

Potassium is present in solid in its pure form. The “s” written in the parenthesis after K describes its physical state which is the same as that of its pure form. So it is not a mixture.

(3) KBr (s)

It is an ionic salt which is solid in nature. The “s” written in the parenthesis after KBr denotes its physical state which is the same as that of its pure form. So it is not a mixture.

(4) KBr (aq)

The “aq” written in the parenthesis after KBr indicates that it is present in the aqueous phase. This means it is formed by the combination of KBr and water so it is a mixture.

Learn more:

The major contribution of Antoine Lavoisier to chemistry: brainly.com/question/2500879
Example of physical change: brainly.com/question/1119909

Answer details:

Grade: High School

Chapter: Elements, compounds, and mixtures

Subject: Chemistry

Keywords: mixture, physical combination, substances, fixed formula, variable, composition, retention, properties, Br2, K, KBr.

Draw a model that compares the arrangement of the subatomic particles of oxygen-16 to another isotope, oxygen-18.

Answers

Explanation:

Answer and Explanation:

Oxygen-16 and oxygen-18 differ in structure only in that oxygen-18 has two more neutrons in its nucleus than oxygen-16 has.

There are three known stable isotopes of oxygen (8O): 16O, 17O, and 18O. Radioactive isotopes ranging from 11O to 26O have also been characterized, all short-lived.

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Which best describes an element? a pure substance a type of a mixture a pure compound an impure substance

Answers

An element is a pure substance. It is the purest and most basic form of any substance on Earth. There are a total of 118 discovered elements, 94 of which naturally occur on Earth. The 24 other elements are synthetic or man-made. Elements are atoms that are made of subatomic particles known as protons, electrons, and neutrons.

Answer:

an element is a pure substance

Explanation:

Where does the equilibrium point occur in a reaction system

Answers

The equilibrium point for a reaction is the point at which the rate of the forward reaction equals that of the reverse reaction. At this point there will not be a net change in the amount of products or reactants observed.

I hope this helps. Let me know if anything is unclear.

Write balanced complete ionic equation for AgNO3(aq)+NaCl(aq)→AgCl(s)+NaNO3(aq)

Answers

AgNO3(aq)+NaCl(aq)→AgCl(s)+NaNO3(aq)
the coefficients are 1 because the equation is balanced already

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