Whose work directly resulted in the development of an atomic model that has negative electrons stuck within a sea of positive material?
Answers
The discoverer of the electron was Thomson. J. J. Thomson portrayed his atom model to look like a plum pudding. In his model, he described that an atom is composed mainly of electrons stuck within a sea of positive material.
Final answer:
The 'plum pudding' model of the atom, which depicted negative electrons embedded in a positively charged mass, was proposed by J.J. Thomson in 1904. This model was later superseded by Ernest Rutherford's nuclear model, which described the atom as having a central, positively charged nucleus surrounded by orbiting electrons.
Explanation:
The atomic model that portrays negative electrons embedded within a sea of positive material is known as the 'plum pudding' model. This model was proposed by J.J. Thomson in 1904. It describes an atom as being primarily composed of an unknown positively charged mass, with negative electrons interspersed within, akin to plums in a pudding.
Thomson's model was a significant step forward in atomic theory, but it was also fundamentally flawed. It was eventually superseded by the nuclear model of the atom, proposed by Ernest Rutherford and his colleagues in 1911. Rutherford's model proposed that most of the atom's mass and its positive charge is concentrated in a central nucleus, with the negative electrons orbiting this central core, rather like the planets orbit the sun. This model more accurately accounts for atomic behavior and structure as we understand them today.
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What is the frequency of an event?Group of answer choicesProbabilityDegreeExpected occurrenceIdentification
Answers
The chemical formula for quartz is SiO_2
The chemical formula for quartz is SiO_2, which represents one silicon atom and two oxygen atoms in each formula unit.
Quartz is composed of silicon (Si) and oxygen (O) atoms bonded together in a specific arrangement. Its chemical formula, SiO2, represents this composition.
In quartz, each silicon atom is bonded to two oxygen atoms, and each oxygen atom is bonded to one silicon atom. This arrangement forms a three-dimensional network structure, making quartz a crystalline mineral.
The chemical formula SiO_2 provides a precise representation of the elements and their ratios in quartz.
Silicon and oxygen are the two elements that make up the mineral, and they are combined in a 1:2 ratio, meaning that for every silicon atom, there are two oxygen atoms.
This ratio is essential for understanding the stoichiometry and structure of quartz.
Quartz has various applications due to its unique properties, such as its hardness, transparency, and ability to transmit certain wavelengths of light, making it valuable in electronics, optics, and various industrial processes.
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(1) CaCO3(s) --> CaO(s) + CO2(g)
(2) 2 Mg(s) + O2(g) --> 2 MgO(s)
(3) H2O(g) --> H2O(l)
(4) CO2(g) --> CO2(s)
Answers
Answer:
Was this correct? I am pretty sure it is since you are going from a solid to a gas in the first reaction.
Explanation:
(1) CaCO3(s) --> CaO(s) + CO2(g) --- solid to solid & gas ** most entropy here
(2) 2 Mg(s) + O2(g) --> 2 MgO(s) solid & gas to a solid
(3) H2O(g) --> H2O(l) gas to a liquid
(4) CO2(g) --> CO2(s) gas to a solid
As temperature rises and a substance transforms from a solid to a liquid to a gas, entropy increases. Because they have the most flexibility to move, gases have the highest entropy values. Here the first reaction has high entropy. The correct option is 1.
The level of unpredictability in a system is known as entropy. The degree of randomness is highest when comparing the three forms of matter solid, liquid, and gas because the gas particles move freely.
(1) CaCO3(s) --> CaO(s) + CO2(g) --- solid to solid & gas - most entropy here
(2) 2 Mg(s) + O2(g) --> 2 MgO(s) solid & gas to a solid
(3) H2O(g) --> H2O(l) gas to a liquid
(4) CO2(g) --> CO2(s) gas to a solid
Thus the correct option is 1.
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Answers
Explanation:
Neon is in group 8/0, which means that it has a full outer shell. Atoms react to get a full outer shell but as neon already has a full outer shell, it doesn't react and stays monatomic.
However, chlorine is in group 7, so it needs 1 more electron to complete its outer shell, two chlorine atom share one electron each with each other so they have full outer shells. This is why chlorine is diatomic.
Answers
Answer:
Moles of Carbon in the product = 0.183 mol
Explanation:
Complete combustion of an organic compound in the presence of excess oxygen will give carbon dioxide (CO2) and water vapour(H2O).
Equation of reaction
CxHyOz(s) + (2x + y/2 - z)/2 O2(g) --> x CO2(g) + y/2 H2O(l)
Moles of products
CO2
Molar mass of CO2 = 12 + (16*2)
= 44 g/mol
n(CO2) = 8.07/44.0
= 0.183 mol
One compound of CO2 has 1 Carbon atom and 2 Oxygen atom.
So if we have,
0.183 moles of carbon dioxide then
0.183 moles of carbon.
The mass of carbon in the product, m = 0.183*12
= 2.20 g
H2O:
Molar mass of H2O = (1*2) + 16
= 18 g/mol
Number of moles of H2O =
= 3.3/18
= 0.183 mol
One compound of H2O has 2 Hydrogen atom and 1 Oxygen atom.
0.183 moles of water then we also have
= 2*(0.183)
= 0.367 moles of hydrogen in the sample.
The mass of hydrogen in the compound, m
= 0.367*1
= 0.367 g
Adding these two values together will give us the mass of our compound that C and H;
2.2 + 0.367
= 2.567 g
So for the Oxygen,
5.5 g - 2.567
= 2.933 g
Moles of Oxygen;
Molar mass of O = 16 g/mol
= 2.933/16
= 0.183 mol
There are 0.030 moles of carbon in the original sample as per the mole concept.
Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.
It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.
It is given by the formula,
The given values are,mass=
molar mass=
Substitution of values in formula gives,
Thus, there are 0.030 moles of carbon in the original sample as per the mole concept.
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density
electrical conductivity
thermal conductivity
Answers
thermal conductivity
Answer:
Thermal conductivity
Explanation:
What is a crosscutting concept for global temperature, explain.
Answers
Answer:
They include patterns; cause and effect; scale, proportion, and quantity; systems and system models; energy and matter; structure and function; and stability and change.
Explanation:
As such, they are a way of linking the different domains of science.