Knowledge of atomic structure has evolved over time. Thomson discovered that atoms contain electrons, Rutherford discovered that most of the mass of an atom is concentrated in its center, and Bohr discovered that electrons orbit the nucleus. Taken together, what do these discoveries demonstrate

Answers

Answer 1

Answer: J.J. Thompson's plum pudding model was devised after thediscovery of electron but before the discovery of the nucleus of the atom.Rutherford, who overturned Thompson's plum pudding model proposed that onhis experiment (Rutherford model) he discovered that the atom has a tiny, heavynucleus, which is named as nucleus of the atom. While the most important properties of atomic and molecular structure was explained using the simple [picture ofan atom called the Bohr Model. This model was proposed by Niels Bohr. He alsoconcluded that an atom is a small, positively charged nucleussurrounded by orbiting electrons. Thedifferent theories and discoveries by the great scientists mentioned abovedemonstrate the atomic model and composition of atoms.

Answer 2

Answer:

Answer:

A. The cumulative nature of science.

Explanation:

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A sample of sodium hydroxide (NaOH) has a mass of 160.0 g. The molar mass of NaOH is 40.00 g/mol. How many moles of NaOH does this sample contain?A) 4.000 B) 40.00 C) 160.0 D) 6,400

When forces attracting solvent particles to each other are broken what is provided for a solution. 1. Energy for the solute to precipitate
2. Space for the solute in the solvent
3.Inertia for the solute to move into the solvent
4. Nothing is provided

Answers

The correct answer among the choices given is option 2. When forces attracting solvent particles to each other are broken, space is provided for the solute in the solvent. This is one of the steps in the dissolving process of a solute in a solvent.

Answer: Option (2) is the correct answer.

Explanation:

A solution consists of a solute and a solvent. A solute is present in less amount as compared to the solvent in a solution.

When forces attracting solvent particles are broken down then particles of the solvent move away from each other.

As a result, spaces will be formed between the solute particles and solvent molecules can easily react with it.

Thus, we can conclude that when forces attracting solvent particles to each other are broken then space for the solute in the solvent is provided for a solution.

What is the wavelength, in nanometers, of light with an energy content of 1898 kJ/mol ?Express your answer using four significant figures.

Answers

The energy of phton can be determined through the formula E= speed of light * Planck's constant divided by the wavelength of light. Placnk's constant is equal to 6.62607004 × 10-34 m2 kg / s while speed of light is equal to 3x10^8 m/s. Hence, the wavelength of light is 1.0465 x10^-22 nanometers.

Which of the following is not a physical change? Melting ice

Breaking glass

Filtering a mixture

Burning paper

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When you burn paper you are chemically altering it so that is the correct answer. When you do all the other choices all of the components stay the same. Just because it changes shapes doesn't mean it'll change chemically toom

Which two gases make up most of the atmosphere?

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nitrogen wich comprises 78% of the atmosphere and oxygen wich accounts for 21%

Which molecule has a nonpolar covalent bond?

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Nonpolar covalent bonds are chemical bonds where two atoms share a pair of electrons with each other and the electronegativities of the two atoms are equal. An example is methane. It has four carbon-hydrogen single covalent bonds. These bonds are nonpolar because the electrons are shared equally.

Final answer:

Nonpolar covalent bonds form when two atoms of the same element or different elements share electrons equally, resulting in a balanced charge distribution. Examples include Methane (CH4) and molecular oxygen (O2). Another case is the CO2 molecule, which is nonpolar because its polar bond moments cancel out.

Explanation:

This leads to a balanced distribution of charges in the molecule, making it nonpolar. Methane, for instance, consists of a carbon atom that shares four electrons equally with four hydrogen atoms, resulting in a bond where the difference in electronegativity between the carbon and hydrogen atoms is minimal.

Another case is CO₂ where the molecule, though consisting of polar bonds, is overall nonpolar because the geometric layout of the molecule allows for the bond moments to cancel each other out, hence no region of the molecule is more positive or negative than any other. Considering the geometry of the molecule is essential when determining the polarity of a molecule with more than one bond.

Learn more about Nonpolar Covalent Bonds here:

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Use two analogies to describe quantized change.

Answers

The two analogies that I used to describe quantized change are;

- Notes on a Piano

- Digital Clock

Quantized change is simply means that the change is definite under certain restrictions such as the gears in our cars. This means that change comes in discreet amounts.

The 2 analogies that I can use to describe it are as follows;

1) Notes on a Piano; When we are turn on a piano, the notes on the piano are fixed and as such we can only play the notes that the keys can hit.

2) Digital clock; The representation of time in digital clocks is in terms of numbers which can be said to be discrete variables.

Read more at; brainly.com/question/12508919

Answer:

See explanation

Explanation:

1) A flight of stairs because there is a specific number of steps one may take at a particular time. That is, the number of steps that can be taken at a given time is not continuous.

2) The gear system of a car: The gear system of a car can only take whole number integer values. It is not continuous and only one level of gear can be attained at a given time.

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