What experimental evidence did Thomson have for each statement? A. Electrons have a negative charge.
B. Atoms of all elements contain electrons.

Answers

Answer 1

Answer: Thomson studied electric discharge in a vacuum and found that the deflection of rays was evidence of atoms containing much smaller particles. He calculated that these particles would have a large charge in relation to their mass. While he did not name electrons, he knew they existed.

Answer 2

Answer:

Answer : In the experiment of Cathode Ray, Scientist J.J. Thomson found that a stream of electricity was attracted to the positive portion of an electrical plate, which helped him to conclude that there must be a negative aspect to matter. He called this discovery as the electron.

He was the one who suggested that these small, negatively charged particles were actually subatomic particles. Which are now called as "electrons".

Since atoms are found to be neutral, when it contain negatively charged electrons it must also contain some positively charged material.

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An ionic solid is placed in a beaker of water. Which of the following occurs when there is a strong attraction between the solute and the solvent?A. The solute melts.
B. The solute dissolves.
C. The solute remains intact.
D. The solute reacts to form a precipitate.

Answers

Answer: Option (B) is the correct answer.

Explanation:

An ionic solid is a substance which has ionic bonds, that is, formed by the transfer of electrons.

Ionic bonds have strong force of attraction because ionic solids have opposite charges which strongly attract each other.

When we dissolve ionic solid in a beaker of water, it completely dissociate into its ions because polar molecules or solutes dissolve in polar solvents.

For example, when NaCl is dissociated into ions then the reaction is as follows.

$NaCl \rightarrow Na^(+) + Cl^(-)$

Thus, we can conclude that when an ionic solid is placed in a beaker of water then the solute dissolves in it.

The answer is B. the solute dissolves. The ionic solid has attraction between ions and when there is strong attraction between solute and solvent, the ion will separate and dissolve in water.

What is the concentration of a solution, in parts per million, if 0.02 gram of Na3PO4 is dissolved in 1000 grams of water?(1) 20 ppm (3) 0.2 ppm
(2) 2 ppm (4) 0.02 ppm

Answers

ppm = mass of solute in mg / mass of solvent in kg

0.02 x 1000 = 20 mg (solute )

1000 / 1000 = 1.0 kg

ppm = 20 / 1.0

= 20 ppm

Answer (1)

hope this helps!

Compare the three subatomic particles in terms of location in the atom mass and relative charge

Answers

The protons are located inside the nucleus and have a positive charge.

The electrons are located outside the nucleus and have a negative charge.

The neutrons are located inside the nucleus and have no charge.

Explanation:

Atom is defined as the smallest unit of a matter.
Atom is made up of three subatomic particles: protons, electrons, and neutrons.
Protons and neutrons are collectively known as nucleons.
Protons are located inside the nucleus of an atom and are positively charged.
Electrons are located outside the nucleus of an atom and are negatively charged.
Neutrons are located inside the nucleus of an atom and have no charge.
It is electrically neutral because they have the same number of protons and electrons.

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Protons and neutrons are located in the nucleas and makes up most of the mass. Electrons orbit around the nucleus in the electron cloud and have very little mass. Protons have a positive (+) charge, Neutrons have neutral (≠) charge, and Electrons have a negative (-) charge.

The element with 8 electrons in its 3d sublevel isa. O.
b. Ne.
c. Ar.
d. Ni.

Answers

According to the electronic configuration, the element with 8 electrons in its 3 d sublevel is nickel.

What is electronic configuration?

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.

Learn more about electronic configuration,here:

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The element with 8 electrons in its 3d sublevel is Ni, Nickel. The answer is letter D. The rest of the choices do not answer the question above.

The fuel used in many disposable lighters is liquid butane, C4H10. Butane has a molecular weight of 58.1 grams in one mole. How many carbon atoms are in 1.50 g of butane?

Answers

Doesnt the number of carbon atoms stay the same.
Though the weight of carbon in 1.5g is 1.24g.

This is because the RAM of C4 is 48.

The RFM of C4H10 is 58. Therefore, 48/58 is carbon in butane.

48/58 x 1.5 = 1.24g

Which of the following is not true of alloys?a. Alloys are made of two or more metals combined physically.
b. The mixture of metals in an alloy is based upon the desired use.
c. Alloys can be substitutional or interstitial.
d. An example of an alloy is copper.