From his experiment j.j. Thomson concluded that

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QUESTION POSTED AT 18/04/2020 - 07:23 PM

Answered by admin AT 18/04/2020 - 07:23 PM

Particles as small as atoms exist.
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Which pairing below does not correctly match the scientist with the contribution to the understanding of the atom? A. Proust and the realization that the elements of compounds are found in certain proportions by mass B. Rutherford and the understanding that the atom has a small, dense nucleus with a positive charge C. Thomson and the law of definite proportions D. Dalton and the initial proposal of the atomic theory of matter

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QUESTION POSTED AT 02/06/2020 - 01:36 AM

Which of the following applies to valid data? Check all that apply. .The data is inaccurate. .The data is collected with care. .The data does not answer the questions of the experiment. .The data is related to the variables of the experiment. its earth science

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QUESTION POSTED AT 01/06/2020 - 04:38 PM

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QUESTION POSTED AT 01/06/2020 - 04:37 PM

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QUESTION POSTED AT 01/06/2020 - 02:56 PM

A student conducts an experiment to determine how the amount of water given to a plant affects its growth. What is the independent variable for this experiment? a. the amount of water b. the height of the plant c. the amount of sunlight d. the amount of soil

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QUESTION POSTED AT 01/06/2020 - 02:10 PM

In a hurry to finish the experiment, Sylvia did not allow all the magnesium to react. Will her reported magnesium to oxygen ratio be reported be too high or too low?

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QUESTION POSTED AT 29/05/2020 - 04:33 PM

Which atomic model was proposed as a result of J.J Thomsons work?

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QUESTION POSTED AT 29/05/2020 - 04:03 PM

Magnesium and nitrogen react in a combination reaction to produce magnesium nitride. 3 mg + n2 ? mg3n2. in a particular experiment, a 9.27 g sample of n2 reacts completely. the mass of mg consumed is

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QUESTION POSTED AT 29/05/2020 - 02:17 PM

Silver's weighted average atomic mass is 107.86, leading one to assume that its most abundant isotope would be silver-108 (or 108Ag). Silver does have two naturally occurring isotopes, but 108Ag is not one of them. Which of the following best explains this phenomenon? a) When one is determining atomic masses in the laboratory, a significant amount of experimental error occurs. b) When the two isotopes of silver experience radioactive decay, their most abundant end product is silver-108. c) Although silver-108 is not naturally occurring, it is synthetically created in large quantities to meet consumer demands. d) The two silver isotopes have atomic masses of approximately 107 and 109 and are found in similar abundance in nature.

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QUESTION POSTED AT 29/05/2020 - 12:45 PM

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QUESTION POSTED AT 29/05/2020 - 12:22 PM

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QUESTION POSTED AT 29/05/2020 - 10:46 AM

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QUESTION POSTED AT 28/05/2020 - 09:48 PM

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QUESTION POSTED AT 28/05/2020 - 03:18 PM

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QUESTION POSTED AT 28/05/2020 - 01:25 AM

Why did Thomson’s results from experimenting with cathode rays cause a big change in scientific thought about atoms? His results gave people a picture of what atoms look like for the first time. His results gave the first clues that atoms could be created and destroyed. His results gave the first experimental evidence that matter is made up of atoms. His results gave the first evidence that atoms were made up of smaller particles.

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QUESTION POSTED AT 26/05/2020 - 07:46 PM

Why are large amounts of energy required to separate a nucleus into protons and neutrons even though the protons experience electrostatic repulsion?

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QUESTION POSTED AT 26/05/2020 - 05:17 PM

In a nuclear experiment a proton with kinetic energy 1.0 MeV moves in a circular path in a uniform magnetic field. What energy must ( a. an alpha particle (q = +2e, m = 4.0 u) and ( b. a deuteron (q = +e, m = 2.0 u) have if they are to circulate in the same circular path?

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QUESTION POSTED AT 26/05/2020 - 03:08 PM

Two atoms have the same number of protons but different number of neutrons. what can you conclude about these masses

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QUESTION POSTED AT 26/05/2020 - 01:01 PM

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QUESTION POSTED AT 26/05/2020 - 12:58 PM

In Thomson’s experiment, why was the glowing beam repelled by a negatively charged plate? 1.) The beam contained lightweight particles which were easily deflected. 2.) The beam contained negatively charged particles. 3.) The beam contained positively charged particles.

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QUESTION POSTED AT 26/05/2020 - 11:44 AM

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QUESTION POSTED AT 26/05/2020 - 10:54 AM

Sort these six events from the earliest to the most recent. Democritus proposes the existence of atoms- Dalton's atomic theory- J.J.Thomson discovers the electron- Rutherford's gold foil experiment-Bohr model- or Schrodinger's wave

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QUESTION POSTED AT 26/05/2020 - 09:24 AM

If a molecule has four hybrid sp3 orbitals, it can be concluded that the molecule has a

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QUESTION POSTED AT 26/05/2020 - 09:14 AM

Over the last 100 years the number of lives lost during major storms like hurricanes has steadily dropped what could be concluded as the primary reason for this decrease

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QUESTION POSTED AT 26/05/2020 - 12:07 AM

Over the last 100 years the number of lives lost during major storms like hurricanes has steadily dropped what could be concluded as the primary reason for this decrease

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QUESTION POSTED AT 26/05/2020 - 12:07 AM

In an experiment, 1.75 g sample of acetic acid, CH3COOH, was burned in oxygen in a calorimeter. The calorimeter contained 925g of water and had a heat capacity of 2.53 kJ/°C. the temperature of the calorimeter and its contents increased from 22.2°C to 26.5°C. use these data to determine the molar heat of combustion of acetic acid? (specific heat capacity of water = 4.18 kJ/Kg·°C) Show ALL Work

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QUESTION POSTED AT 11/05/2020 - 06:29 AM

The results of Rutherford’s gold foil experiment disproved the model of the atom that his mentor and colleague had proposed. How does this example represent part of the necessary process for developing a scientific theory?

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QUESTION POSTED AT 11/05/2020 - 01:09 AM

Experimenting to determine the fundamental properties of X-rays would be an example of basic research. (A) True (B) False

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QUESTION POSTED AT 09/05/2020 - 07:00 AM

A substance is made up of slow-moving particles that have very little space between them. Based on this information, what can most likely be concluded about this substance? It is not a gas because its particles do not move continuously. It is a gas because its particles move continuously in a straight line. It is not a gas because its particles do not have large spaces between them. It is a gas because its particles move in many different directions

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QUESTION POSTED AT 22/04/2020 - 07:28 PM

J.J. Thomson 's experiment disproved the theory that an atom??

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QUESTION POSTED AT 22/04/2020 - 07:24 PM