Explanation:
charged particles=8 which is proton and proton=no.of electron. That's why 8 particles are revolving round this center. And this atom structure is of oxygen
If the center of an atom has 8 charged particles that are protons as the neutrons are neutral there will be 8 negative charges that are electrons revolving around the center nucleus.
What is an atom?An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether it is solid,liquid or gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged particles and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged particles and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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90 is 50% of what number?
Part = Whole x Percent
P:
W:
%
Answer:
90 is 50% of 180
Explanation:
Just multiply 80 by 2 for 50%
two lamps (with a resistance of 10 Ohms each) are connected in a parallel circuit and are supplied with 100- volts of power. which of the following statements are true of the voltage that each lamp receives
a. Each lamp will recieve 50 volts
B. Each lamp will recieve 100 volts
C. The first lamp will recieve more voltage than the second lamp
In the parallel circuit, each lamp will receive 100 volts.
Equivalent resistance of the parallel circuitThe equivalent resistance of the parallel circuit is the inverse sum of the resistance of the two resistors in the circuit. This is as a result of different current flowing in each resistor parallel circuit arrangement.
The equivalent resistance is calculated as follows;
1/R = 1/10 + 1/10
1/R = 2/10
R = 10/2
R = 5 ohms
Current in each resistorI = V/R
I = 100/10 = 10 A
Voltage in each resistorV = IR
V = 10 X 10 = 100 V
Generally, for a circuit in parallel connection, same voltage will flow in each resistor of the circuit while different current will flow in the resistors.
Thus, the correct statement is, "Each lamp will receive 100 volts".
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Magnesium oxide does not readily decompose into magnesium and oxygen. the reaction is shown below. mgo(s) 601.7 kj right arrow. mg(s) ½o2(g) which factor plays the most important role in allowing this reaction to occur? temperature concentration pressure surface area
Temperature factor plays the most important role in the decomposition reaction of magnesium oxide.
What is spontaneous reaction?
Those reactions which are exothermic in nature or release heat during the reaction are spontaneous reactions.
Given decomposition reaction of magnesium oxide is:
MgO(s) + 601.7 kJ → Mg(s) + ½ O₂(g)
From the above reaction, it is clear that during the decomposition of magnesium oxide heat is absorbed. So, for the feasible decomposition of compound accurate temperature is wanted.
Hence, correct option is temperature.
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Answer:
temperature
A.
Explanation:
edgen
Which force controls the size of an atomic nucleus?.
Answer:
strong nuclear force
Explanation:
1, a force that acts on charged particles
2, a force that holds atomic nuclei together
3, gravity, weak nuclear, electromagnetic, strong nuclear
4, strong nuclear force
5, Gravity and the electromagnetic force have infinite ranges while the nuclear forces have very small ranges.
100% :)
Who was the first person to suggest the existence
of atoms?
Dalton
Democritus
Proust
O
Thomson
Answer is C
Answer:
democritus is the first person
Escribe la configuracion electronica de 2 elementos no metalicos y dos elementos pertenecientes a los gases nobles.
IMPORTANTE AYUDA
ND DE RESPUESTAS RARAS SOLO POR PUNTOS PLS!!
Answer:
(See explanation)
Explanation:
2 Non-Metal Elements:
Oxygen:
[tex]1s^{2} 2p^{2} 2p^{4}[/tex]
or it's noble gas configuration: [He] 2s² 2p⁴
Carbon:
[tex]1s^{2} 2p^{2} 2p^{2}[/tex]
ot its noble gas configuration: [He] 2s² 2p^2
Noble Gasses:
Xenon:
[Kr] 4d¹⁰ 5s² 5p⁶
Argon:
[Ne] 3s² 3p⁶
Burning hydrogen is an example of a chemical reaction. The reaction is
shown in the diagram. Which of the following statements about energy in
this reaction is the most accurate?
There is no energy in this reaction
Describe how continents change over time.
Which of the following is the name of the process occurs in the sun, in which two hydrogen nuclei combine to make when helium nucleus 
Answer:
This is called nuclear fusion. It takes four hydrogen atoms to fuse into each helium atom.
Petroleum lowest boiling point
plssssss
95 C/ 203 F
Explanation:
Which organelle stores water, sugar, and waste products in plant cells?
vacuoles
the cell wall
chloroplasts
ribosomes
Answer:
The first one - Vacuoles
Explanation:
Hope this helps. :)
How many C8H18 particles would be in 12.6 moles of octane (C8H18)?
Taking into account the definition of Avogadro's number, 7.59×10²⁴ particles of C₈H₁₈ would be in 12.6 moles of octane.
Definition of Avogadro's NumberAvogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.
Amount of C₈H₁₈ particlesThen you can apply the following rule of three: If by definition of Avogadro's number 1 mole of C₈H₁₈ contains 6.023×10²³ particles, 12.6 moles of the compound contains how many particles?
amount of particles of C₈H₁₈= (6.023×10²³ particles × 12.6 mole)÷ 1 mole
amount of particles of C₈H₁₈= 7.59×10²⁴ particles
Finally, 7.59×10²⁴ particles of C₈H₁₈ would be in 12.6 moles of octane.
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A sample of gas has an initial volume of 20 L and an initial pressure of 2.5 atm. If the pressure changes to 3.1 atm, what is the new volume, assuming that the temperature remains constant?
Answer:
The answer is 16.12 L
Explanation:
2.5 * 20 = 3.1 * V2
V2 = 50/3.1
V2= 16.12 L
hope this helps
The new volume can be calculated using Boyle's law. If the pressure increases from 2.5 atm to 3.1 atm, then volume decreases from 20 L to 16.1 L.
What is Boyle's law ?Boyle's law is a fundamental law of physics that describes the relationship between the pressure and volume of a gas at a constant temperature. It is named after the Irish physicist Robert Boyle, who first stated the law in the mid-17th century.
Boyle's law states that at a constant temperature, the pressure of a gas is inversely proportional to its volume. This means that as the volume of a gas decreases, its pressure increases proportionally.
Hence,
P1V1 = P1V2.
given,
P1 = 2.5 atm
V1 = 20 L
P2 = 3.1 atm
then V2 = P 1 V1 /P2
V2 = 2.5 atm × 20L/3.1 atm = 16.1 L.
Therefore, the new volume of the gas is 16.1 L.
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If Earth is in between the sun and the Moon in both Image 1 and Image 2, why do you think a lunar eclipse is only happening in Image 2?
Answer:
In image 1, the moon is in a certain spot in its tilted elliptical orbit, so it is effectively under the Earth from the Sun's perspective. But in image 2, The moon is actually behind the Earth from the Sun's perspective.
Explanation:
I kinda' explained in my answer
In image 2, the lunar eclipse because the earth's shadow falls on the surface of the moon when Earth, moon, and sun all are aligned in a straight line.
What is a lunar eclipse?A lunar eclipse usually takes place when the Moon moves into the shadow of the earth. This eclipse happens only when the Sun, Earth, and Moon are exactly aligned with Earth between the other two, which can occur only on the night of a full moon when the Moon is close to the lunar node.
When the moon is eclipsed by the Earth, it gets on a reddish color that is caused by the planet when it fully blocks direct sunlight from reaching the Moon's surface, as only the light reflected from the lunar surface has been refracted by the atmosphere of the earth. Due to the Rayleigh scattering of blue light, this light appears reddish.
A total lunar eclipse lasts up to nearly 2 hours, lunar eclipses are safe to view. Therefore, image 2 represents the lunar eclipse.
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What is the constant movement
of water from the ground, to the
sky, and back again called?
A rain
B snow
C water cycle
D rain clouds
Answer:
C the water cycle
Explanation:
The water gets evaproated, then it becomes clouds and thn it makes precipitation! The correct answer is the water cycle!
Have an amazing day!!!
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Which if the following help a tropical storm become a hurricane? making landfall a cold wind an earthquake warm water
making landfall
a cold wind
an earthquake
warm water
Answer:
a cold wind
Explanation:
It starts as a tropical disturbance. Then, with cyclonic circulation and faster wind speeds, it becomes a tropical depression. If the wind keeps getting faster, it becomes a tropical storm and then a hurricane if winds are more than 74 miles per hour (mph).
Radon-22 has a half –life of approximately 6 days. If you begin with a sample containing 40 grams of radon, how many grams of radon will be left after 24 days?
Calculate the pH for the following solutions and indicate whether each solution is acidic or basic.
[OH-] = 1.0 × 10-2M pH = __________ Acid/Base
Answer:6=base
Explanation:
Which statement best describes why electrons are typically not included when determining the mass of an atom?
Answer:
Are there any letters? if so. Letter B
Explanation:
Answer:
The charge of a proton cancels the charge of an electron.
Explanation:
if i thing you have the same paper as me it is B
help!
If the distance between a proton and electron is cut in half, how will that affect the electric force?
A. Cut in half
B. Doubles
C. Quadruples
D. Decreased by four times
Answer:
it will doublethe force attraction
A gas has a volume of 9.3 L at 27C . What is it’s temperature at 7.5 L? (DONT FORGET TO CONVERTVRO KELVIN)
Answer:
T2 = 242.06
Explanation:
Follow this equation to find T2: V1/T1 = V2/T2
V1 = 9.3L
T1 = 27C (to convert to Kelvin + 273.15) ---> 27 + 273.15 = 300.15K
V2 = 7.5L
T2 = ?
V2×T1/V1 = T2
7.5×300.15/9.3 = T2
242.06 = T2
So 242.06 is the answer!
A sample of sodium hydroxide (NaOH) has a mass of 160. 0 g. The molar mass of NaOH is 40. 00 g/mol. How many moles of NaOH does this sample contain? 4. 000 moles 40. 00 moles 160. 0 moles 6,400 moles.
4 moles of NaOH is present in the given 160 grams of NaOH.
How we calculate moles?Moles of any substance will be calculated as:
n = W/M, where
W = given mass of NaOH = 160 grams (given)
M = molar mass of NaOH = 40 g/mole
Moles of NaOH is calculated as:
n = 160g / 40g/mol = 4 moles
Hence, moles of sodium hydroxide (NaOH) is 4 moles.
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Imagine you are working in the lab and your chemical bottle is labeled Fe2O3. Explain how you could
determine if the iron in the compound is Fe+2 or Fe+3. Provide the name of the compound in your
answer.
Using the reaction below, calculate how many grams of CO2 is produced from 100 grams of CH4. CH4 + 2 O2 → CO2 + 2 H2O Round your answer to the 2nd decimal place (hundredths).
Answer:
274.08 g of CO2
Explanation:
please see paper for work!
Help↷
The efficiency of a fuel is expressed in terms of its ________.
A. density
B. calorific value
C. volume
D. purity
⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻
[B] Calorific Value
⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻
Explanation:
The correct answer is [B] Calorific value
Calorific Value ⇒ Amount of energy (heat) produced on burning 1 kg of a fuel completely in air. Which expressed in a unit called kilojoule per kilogram. (kj/kg)
Hence, [B] Calorific value is the answer.
~Lenvy~
Answer:
B. calorific value
Explanation:
Fuel efficiency is measured in terms of calorific value, which is measured in kilojoules per kilogramme. It is the amount of heat produced by the complete combustion of one kilogramme of fuel.
I am joyous to assist you at any time.
What are at least 3 places carbon can be found?
Answer:
Carbon can be found in the ocean, rocks, and the atmosphere around us.
B. from 52 moles of nitric acid, how many moles of silver nitrate will be produced?
Answer:
39 mol AgNO3
Explanation:
We have the equation 4HNO3 + 3Ag -----> 3AgNO3 + NO + 2H2O
We want to calculate the number of silver nitrate (AgNO3) moles that would be produced from 52 moles of nitric acid ( HNO3 )
We can calculate this by using mole ratio as well as dimensional analysis.
The mole ratio of Silver nitrate to nitric acid based on the balanced equation is 3AgNO3:4HNO3.
Using this we can create a table: The table is attached.
Breakdown of the table.
The moles of nitric acid cancel out and we multiply 52 by 3/4 to get 39 moles of Silver nitrate.
What aspect of sound waves does the student observe? A. absorption B. refraction C. resonance D. transmission
Resonance and transmission are the two aspects of sound waves that the student observe.
What is resonance?Resonance is defined as when one object vibrating at a specific natural frequency and compels the second object into vibrational motion.
We know that sound waves required medium and transmit from one place to other by transferring the sound energy to its neighbouring particles so we can conclude that Resonance and transmission are the two aspects of sound waves that the student observe.
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A gas occupies 30. L at 2.0 atm pressure and 27°C. Calculate the volume of the gas if
the pressure remains at 2.0 atm, but the temperature is raised to 54°C.
Answer:
V2 = 33L
Explanation:
KNOW THAT:
V1 = 30L
P1 = 2.0atm
T1 = 27 + 273.15 = 300.15k (it's help to be in Kelvin)
P2 = 2.0 atm
T2 = 54 = 273.15 = 327.15
V2 = ?
We have an equation: P1V1/T1 = P2V2/T2
Multiply both side for T2 to remove it, divided both side for P2 to remove it. So we can left with V2, and that is what we want to find.
T2P1V1/T1P1 =>> V2= 33L
A 5.00 L sample of helium expands to 15.0 L, at which point the pressure is measured to be 0.720 atm. What was the original pressure of the gas
The original pressure of a gas that has 5.00 L of its sample expanded to 15.0 L, at which point the pressure is measured to be 0.720 atm is 2.16atm.
How to calculate pressure?The pressure of a gas can be calculated using the Boyle's law equation as follows:
P1V1 = P2V2
Where;
P1 = initial pressureP2 = final pressureV1 = initial volumeV2 = initial volumeP1 × 5 = 15 × 0.720
5P1 = 10.8
P1 = 10.8 ÷ 5
P1 = 2.16atm
Therefore, the original pressure of a gas that has 5.00 L of its sample expanded to 15.0 L, at which point the pressure is measured to be 0.720 atm is 2.16atm.
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