Which of the following describes the Bohr atomic model?A. Protons, neutrons, and electrons orbit around each other in set paths.
B. The nucleus contains protons and neutrons and is orbited by electrons.
C. Protons, neutrons, and electrons occupy the same spaces within the atom.
D. Protons occupy the center of an atom, with neutrons and electrons circling.

Answers

Answer 1

Answer: Answer: option B. The nucleus contains protons and neutrons and is orbited by electrons.

This is the planetary model, which is so known nowadays, but it is not correct. The quantum model is based in orbitals (not orbits), which are regions around the nucleus where are the electrons, but they are not circling around the nucleus.

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a mixture of oxygen, hydrogen, and nitrogen gases exerts a total pressure of 282 kpa. if the partial pressures of oxygen and hydrogen are 110 kpa and 106 kpa respectively, what is the partial pressure exerted by nitrogen?

Answers

Answer : The partial pressure of $N_2$ is, 66 Kpa

Solution :

According to the Dalton's law, the total pressure of the gas is equal to the sum of the partial pressure of the mixture of gasses.

$P_T=p_(N_2)+p_(O_2)+p_(H_2)$

where,

$P_T$ = total partial pressure = 282 Kpa

$P_(N_2)$ = partial pressure of nitrogen = ?

$P_(O_2)$ = partial pressure of oxygen = 110 Kpa

$P_(H_2)$ = partial pressure of hydrogen = 106 Kpa

Now put all the given values is expression, we get the partial pressure of the nitrogen gas.

$282Kpa=p_(N_2)+110Kpa+106Kpa$

$p_(N_2)=66Kpa$

Therefore, the partial pressure of $N_2$ is, 66 Kpa

pressures oxygen and hydrogen + pressure nitrogen

110 Kpa + 106 Kpa = 216 Kpa

Partial pressure:

total pressure - exerted by nitrogen:

282 Kpa - 216 Kpa

= 66 Kpa

hope this helps!

What is the formula mass for fe(no3)3

Answers

Calculando a massa molar (molar peso) Para Calcular a massa molar de hum Composto químico, ponha SUA fórmula E clique em 'Calcular'. Na Fórmula química that rápido Você PODE USAR: QUALQUÉR elemento químico Grupos Funcionais: D, Ph, Me, Et, Bu, AcAc, Para, Ts, Tos, Bz, TMS, tBu, Bzl, Bn, Dmg PARENTESIS () UO colchetes [] . Nomes Comuns de Compostos. Os Exemplos de Cálculos de Massa molar: NaCl , o Ca (OH) 2 , K4 [Fe (CN) 6] , CuSO4 * 5H2O , água , ácido nítrico , permanganato de potássio , etanol , frutose . Peso Computação molecular (massa molecular) para calcular o peso molecular de um composto químico entrar em sua fórmula, especifique seu número de massa isotópica depois de cada elemento entre colchetes. Os Exemplos de Cálculos de peso molecular: C [14] o [16] 2 , S [34] O [16] 2 . Definição de massa molecular, o peso molecular, uma massa molar e do peso molar Massa molecular ( peso molecular ) e uma massa de uma molécula de uma substancia e e Expressa nsa unificadas unidades de massa atómica (u). (1 u E igual a 1/12 da massa de hum átomo de carbono-12) Massa Molar ( molar peso ) E uma massa de Uma toupeira de Uma substancia ê ê expresso em g / mol. Pesos dos Átomos e isótopos São de NIST Artigo . DEIXE Seu comentário Sobre a SUA Experiência com uma calculadora de Peso Molecular Pesos moleculares de Aminoacidos: Relacionados

The formula mass of fe(no3)3 is179.87.

Which of the following is a chemical property of vinegar? A. The pH of vinegar is around 2.4. B. Vinegar freezes at around 2°C. C. Vinegar boils at about 100°C. D. The color of vinegar ranges from colorless to brown. E. Vinegar is a transparent liquid.

Answers

I think the correct answer from the choices listed above is option A. The chemical property of a vinegar is that the pH of vinegar is around 2.4. It tells something about the concentration of hydrogen ions in the solution. The other choices given only describe the physical properties of the substance.

Answer:

Explanation:

trust me bro

In an experiment, Ann mixes concentrated sulfuric acid with water in a reaction test tube. The walls of the test tube turn hot.Which of the following type of reaction has occurred?A) endothermic
B) exothermic
C) reversible
D) irreversible

Answers

B) Exothermic
The reaction released heat energy to its surrounding, thus, it was exothermic.
"exo" is to expel or put outside
"thermic" means heat

Answer: B) exothermic

Explanation:

Endothermic: The chemical reactions in which reactants form products by absorption of energy are called as endothermic reactions.

Exothermic : The chemical reactions in which reactants form products along with release of energy are called as exothermic reactions. Thus if walls turn hot that means the energy has been released.

Reversible: The chemical reactions in which reactants form products and products can also be converted back to reactants are called as reversible reactions.

Irreversible: The chemical reactions in which reactants form products but products can not be converted back to reactants are called as irreversible reactions.

Argon-39 has a half-life of 269 years. How long will it take for 52.5 g of a 60.0 g sample to decay to its daughter isotope?

Answers

The years that will take or 52.5 g of a 60.0 g sample to decay to its daughter isotope is 807 years.

What is half-life?

Half-life is the time required to decay or undergo half the process of any element.

Given the sample is 60.0 g in which 52.5 g sample has to be decay

so, 60 - 52.5 = 7.5 g

It can be seen that it goes three half life

60 >30 >15 >7.5

Now, the half life is 269

269 × 3 = 807 years.

Thus, the years taken are 807 years.

Learn more about isotopes

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For 60.0 g sample, if it remains 60-52.5=7.5 g, it will go through 60->30->15->7.5, 3 half-life. So the time being taken is 269*3=807 years.

The most easily polluted groundwater reservoirs are ______ aquifers?

Answers

Water-table aquifers.

The most easily polluted groundwater reservoirs are water-table aquifers.

Infiltration is the process by which rainwater becomes groundwater. In the water cycle, which involves primarily; evaporation, condensation and precipitation. Henceforth, after precipitation comes infiltration in the land areas leaving the rainwater aggregated in a single location which accumulates over time. Then this process is followed by runoff and subsurface flow by which water flows through other bodies of water, either in river, sea or ocean, even lake. Other rainwaters that has segregated and wasn’t able to transport itself stays in the process of infiltration, thus groundwater.

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