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3 years ago

What is the most likely reason why scientists change a model?

1 answer:

5 0

A doesn't change the model, that's what google's for, B can be easily used with the current model, and D is ridiculous.

The model of, for example, the atom, has changed over the years with multiple experiment sand multiple models. There was plum pudding, for example, with protons and electrons scattered throughout, until Rutherford's experiments (a new discovery) changed that because he found a dense nucleus.

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Oxygen and nitrogen are both gases at room temperature. Explain why oxygen has a greater force of attraction between its particl

RideAnS [48]

Answer:

Explanation:

Oxygen molecules and Nitrogen molecules forms in a very similar way. The attraction between particles of oxygen is great due to its very high electronegativity value. Oxygen has a higher electronegative value compared to nitrogen.

Electronegativity of an atom is the relative tendency with which atoms of an element attracts valence electrons in a chemical bond. Valence electrons are used in forming chemical bonds. They can be transferred from one atom to the other or they can be shared.

Oxygen is the second most electronegative atom on the periodic table. To form a bond, it shares the valence electrons in order for its octet to be complete. Pull for the valence electrons between the contributing atoms is very strong due to their large electronegative values. This pull is stronger compared to that between nitrogen atoms.

8 0

3 years ago

What is the oxidation number of Pb(NO3)2

ivanzaharov [21]

Answer:

Explanation:

The nitrate ion is a radical with an overall charge of -1. To get the oxidation number of lead, add up all the oxidation numbers and equate to zero. Therefore the oxidation state of lead is +2.

6 0

3 years ago

Read 2 more answers

2. Identify items in your life that are made of each type of element: metal, nonmetal, and metalloid. For each item, explain why

Bad White [126]

Metalloids:alloys of metallods are commonly used in discs like compact discs, CDs ,and DVDs .These materials change from glassy to crystalline with the application of heat which makes them useful as data storage media

3 0

3 years ago

How many milligrams of CO exist in 12000 liters of air with 10 ppm of CO?

VARVARA [1.3K]

Answer:

The mass of CO in 12,000 Liters of air is $12\times 10^4 mg$ .

Explanation:

The ppm is the amount of solute (in milligrams) present in one Liter of a solvent. It is also known as parts-per million.

To calculate the ppm of oxygen in sea water, we use the equation:

$\text{ppm}=\frac{\text{Mass of solute}(mg)}{\text{Volume of solution}(L)}$

The ppm concentration of CO = 10 ppm

Mass of CO = m

Volume of air = 12,000 L

$10 =\frac{m}{12,000 L}$

$m=10\times 12,000 mg=120,000 mg=12\times 10^4 mg$

The mass of CO in 12,000 Liters of air is $12\times 10^4 mg$ .

3 0

3 years ago

Based on nuclear stability, what is the symbol for the most likely product nuclide when iodine-123 undergoes decay?

MissTica

Answer is: Te (tellurium).
During electron capture, iodine-123 form the nearly-stable nuclide tellurium-123.
In beta plus decay (atomic number Z is decreased by one), a proton is converted to a neutron and positron and an electron neutrino, so mass number does not change.
Iodine-123 is a radioactive isotope of iodine used in nuclear medicine imaging.

6 0

3 years ago