Answer:
The correct answer is - option b. We have discovered that atoms are made up of smaller particles, called subatomic particles.
Explanation:
Dalton made various postulates related to the atom which is an atomic theory that was first try to describe all properties of atoms. The major part of this atomic theory is that the atoms are unit that makes all the matter which is indivisible.
This postulate of the atomic theory is incorrect and changed as atoms are not indivisible and can divide into subatomic particles (proton, neutron and electron) however atoms are the unit that involves in reaction.
The way in which the atomic theory changed since John Dalton wrote his postulates is that: B. We have discovered that atoms are made up of smaller particles, called subatomic particles.
An atom can be defined as the smallest, indivisible, fundamental unit of matter that forms all chemical elements. Thus, it is the fundamental (basic) building blocks of matter.
The first model of an atom was proposed by a notable English chemist called John Dalton. In the early 1800s, John Dalton adopted Democritus' theory to formulate the first model of an atom.
Dalton's atomic theory postulated that the atom of a chemical element as an impenetrable, indivisible, very small (tiny) but movable hard sphere i.e it cannot be divided into subatomic particles.
However, it has been established by other atomic model that an atom comprises three subatomic particles such as:
ProtonsElectronsNeutronsRead more on atoms here: https://brainly.com/question/377844
If an atom has 15 protons, 12 neutrons, and 19 electrons, what is the atom's electrical charge? A. -7 B. +7 C. +3 D. -4
What is the volume of a gas balloon filled with 4.0 moles of tha gas, when the barometer reads pressure of 780 Torr and temperature is 30°C.
Answer:
V = 96.61 L
Explanation:
Given data:
Number of moles = 4.0 mol
Pressure = 780 torr (780/760 = 1.03 atm)
Temperature = 30°C
Volume of gas = ?
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
Now we will convert the temperature.
30+273 = 303 K
1.03 atm × V = 4.0 mol × 0.0821 atm.L/ mol.K × 303 K
V = 99.505 atm.L / 1.03 atm
V = 96.61 L
Ammonia is a covalent bonded compound because... I need helpppp!!!!
Please answer these two questions ASAP. Thanks.
Answer:
Speed and 0, at starting point
Answer:
Speed
0,at the starting point
Supongo que quiere preparar una solución al 10% de sulfato de magnesio en peso. El frasco del producto químico que se tiene indica que el sulfato de magnesio heptahidratado Cuántos gramos de hidratado serán necesarios para preparar 120 gramos de esta solución .Cuántos gramos de agua?
Answer:
Se requerirán 14.57 gramos de MgSO₄·7H₂O, que se disolverían en 105.43 gramos de agua.
Explanation:
Si tenemos 120 gramos de una solución al 10% de sulfato de magnesio en peso, habrán en la solución (120*10/100) 12 gramos de sulfato de magnesio (MgSO₄).
Sin embargo, el reactivo que está disponible es heptahidratado (MgSO₄·7H₂O), por lo que hay que calcular cuántos gramos de sulfato de magnesio heptahidratado contendrán 12 gramos de MgSO₄.
Calculamos las moles de 12 gramos de MgSO₄, usando su masa molecular:
12 g MgSO₄ ÷ 120.305 g/mol = 0.0997 mol MgSO₄.Después calculamos la masa de MgSO₄·7H₂O que contendrá 0.0997 mol MgSO₄, usando la masa molecular de MgSO₄·7H₂O:
0.0997 mol * 246.305 g/mol = 14.57 g MgSO₄·7H₂OPara saber la cantidad de agua en la que se disolverá el reactivo, restamos la masa de soluto de la masa total de la solución:
120 g - 14.57 g = 105.43 gA student was assigned to take water samples from a lake near his home he measured the Ph of one of the water samples to be 6.0. which of the following best describes this sample of water
Highly acidic
Slightly acidic
Highly basic
Slightly basic
Answer:
B. Slightly acidic
Explanation:
pH can be defined as a measure of the negative logarithmic concentration of hydrogen ion (H+) in an aqueous solution.
Basically, the pH scale is used to measure the level of acidity or basicity of an aqueous solution based on a scale of 0 to 14.
An acidic solution has a pH lower than 7 (0 - 6), a basic solution has a pH higher than 7 (7 - 14) and a neutral solution has a pH of exactly 7.
In this scenario, a student was assigned to take water samples from a lake near his home he measured the Ph of one of the water samples to be 6.0. Therefore, this sample of water can be said to be slightly acidic its pH is slightly below 7.
Old photographic flashbulbs burn magnesium metal in a reaction that causes a flash of brilliant white light. A photographer would need to take care not to suffer burned fingers when trying to replace the hot bulb. What best identifies the energy transformation that occurs in the flashbulb? chemical energy to electromagnetic energy and thermal energy electromagnetic energy to chemical energy and thermal energy chemical energy to electromagnetic energy thermal energy to chemical energy
Answer:
A
Explanation:
Answer:
A
Explanation:
Not D or B
Step 4: Measuring the Volume of Air Near 0°C
°C
Temperature of gas:
Height of the column of gas.
cm DONE
Temperature of gas
Answer:
Temperature of gas: 3 Celsius
Temperature of gas: 276 K
Height of the column gas: 5.7 c.m
Volume of gas (V=TTr^2h):cm^3: 0.72
Explanation:
There is a pictucre below to help also
Hopes this helps
Answer:
I hope this helps!
Explanation:
Which organelle is like the brain of the cell?
vacuole
endoplasmic reticulum
cytoplasm
nucleus
Answer:
nucleus
Explanation:
Answer:
The nucleus
Explanation:
The nucleus can be thought of as the brains of a cell.
-CancerQuest
2) Convert 2.65*10^ ^ 25 atoms of Chlorine to moles of CI
Answer:
22 mol
Explanation:
Given data:
Number of atoms of Cl = 2.65×10²⁵ atom
Number of moles of Cl = ?
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
2.65×10²⁵ atom × 1 mol / 6.022 × 10²³ atoms
0.44×10² mol
22 mol
Where is there higher air pressure, above the land or above the water?
Answer:
The air above land also warms faster than air above the sea. Cooler higher pressure air above the ocean moves toward warmer lower pressue air above land.
Answer:
Use the sources to help you, but I would say above the water.
Explanation:
"However, water heats up much more slowly than land and so the air above the land will be warmer compared to the air over the ocean. The warm air over the land will rise throughout the day, causing low pressure at the surface. Over the water, high surface pressure will form because of the colder air."
AND
"The depth (distance from top to bottom) of the atmosphere is greatest at sea level and decreases at higher altitudes. With greater depth of the atmosphere, more air is pressing down from above. Therefore, air pressure is greatest at sea level and falls with increasing altitude."
I hope this helps you!
Is H20 > H2 + O2 a balanced equation?
Answer:
No
Explanation:
H2O > H2 + O2
There is an uneven amount of oxygen on the right side
it will look like this balanced:
2H2O(l) > 2H2(g) + O2(g)
on plato
Which sphere includes rocks and minerals?
A.
atmosphere
B.
biosphere
C.
geosphere
D.
hydrosphere
Answer:
c. Geosphere
Explanation:
thats it hope this will help
Answer:
The answer is C- Geosphere.
Explanation:
I just took the test and got it right.
The word Geo means earth and it's rocks and minerals.
Hope this helps! (:
Difference between absolute atomic mass and relative atomic mass with example
“Atomic mass” is relative to the isotope carbon-12 weighing exactly 12 atomic mass units. Therefore “atomic mass” is precisely the same as “relative atomic mass.”
Two further points:
First, atomic mass as stated on the periodic table is a average of the masses of an element’s naturally-occurring isotopes, weighted by their abundance. This is because atomic mass as normally used is a bulk property: we weigh out many trillions of atoms at a time, because we usually deal in macroscopic quantities. And that means that an average mass is more useful to us.
Second, all masses are relative masses (until the new, physical-constant-based kilogram comes online; and arguably even then). We mass something by comparing it to some standard of reference: until later this year, that something is a chunk of alloy in Paris, France. When the new standard comes into use, we will be comparing the kilogram’s gravitational mass to the strength of the electromagnetic force.
But that’s kind of trivial; it just stems from the fact that any and every measurement is a comparison to something else.
Edit: IUPAC, the world’s premier organization for the imposition of picky definitions that most people never need to use, has the following:
Atomic mass is the mass of a single atom; the unit is the Dalton or unified atomic mass unit. (I would use “isotopic mass” to specify the mass of a particular atom, but that’s not sanctioned by IUPAC.)
Relative atomic mass is the measured average mass of all atoms of a particular element in a particular sample. To make it unitless, it’s divided by the value of the unified atomic mass unit.
Standard atomic weight is the value you read off of the periodic table; it’s an Earth-based average over many samples, of experimental values of the relative atomic mass. Values are promulgated by the IUPAC Commission on Atomic Weights and Isotopic Abundances, and are revised every two years.
Most chemists refer to standard atomic weight as “atomic mass” or “atomic weight” and get on with their lives.
The unified atomic mass unit is 1/12 of the mass of an atom of carbon-12. It is sometimes called the Dalton.
Definitions taken from the IUPAC Gold Book.
As far as I can tell, relative atomic masses and standard atomic weights are made unitless so that they can be used with any convenient macroscopic mass unit to determine correct proportions for a desired chemical reaction.
How many electrons surround the
nucleus of an atom of Thallium?
Answer:
81
Explanation:
What are three elements in the same period
Explanation:
lithium hydrogen sodium oxygen
Which of the following situation Is the best example of long-term movement? A- Take a quick trip to the store B- Go to school each day C- Move to a new state D- Visit the library after school?
Answer:
The Answer Is C
Which of the following of elements would have all four valence electrons
B, Si, As, Te
C, Si, Ge,Sn
O, S, Se, Te
Ga, Ge, As, Se
Answer:
D
they are used for manufacturing Of diodes
Answer:
is the answer D
Explanation:
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The net force on a car accelerating
at a rate of 2.5 m/s2 is 2,000
newtons. Calculate the mass of the
car.
Answer:
800 kgExplanation:
The mass of the car can be found by using the formula
[tex]m = \frac{f}{a} \\ [/tex]
f is the force
a is the acceleration
From the question we have
[tex]m = \frac{2000}{2.5} \\ [/tex]
We have the final answer as
800 kgHope this helps you
A folded rock formation with the label A at the top of one of the folds. A geologist sees this folded rock when studying in the field. He is drawn to the sample that is labeled A. He determines this formation was caused by compression. What type of landform did he find at label A? anticline syncline plateau fault-block mountain
Answer:
Anticline
Other than that Just A C:
Explanation:
Answer:
A
Explanation:
2. Which of the following element has no neutron partied particle?
A. Hydrogen B. Helium
C. Lithium
D Sodium
Answer:
A.hydrogen
Explanation:
A normal hydrogen (H) atom does not have any neutrons in its tiny nucleus
What element is found in liver and is needed to prevent anemia or “tired” blood?
Answer:
Iron (Fe)
Explanation:
Which has the highest boiling point?
natural gas
lubricating oil
gasoline
kerosene
fuel oil
Answer:
lubricating oil
Explanation:
Of the given fractions, lubricating oil has the highest boiling point of all.
It is a petroleum fraction used for lubrication and reducing friction between moving parts of machineries .
Lubricating oil is a heavier fraction of oil. Heavier fractions of oil usually have higher boiling points. Natural gas and gasoline are lighter fractions. They are the first set of fractions to come out in distillation column.Which answer best describes what is happening in the following reaction?
2C8H18 + 25O2 Right arrow. 16CO2 + 18H2O
This is not a redox reaction. It is an example of combustion.
This is a redox reaction in which octane (C8H18) is oxidized.
This is a redox reaction in which carbon dioxide (CO2) burns due to ignition.
This is not a redox reaction, because a solution of carbon dioxide and water results.
Answer:
b. This is a redox reaction in which octane (C8H18) is the reducing agent.
Explanation:
edge 2021 i just did it
The statement which best describes the reaction is:
This is not a redox reaction. It is an example of combustion.
What is redox reaction?This is a reaction which is accompanied by a change in the oxidation number of the reacting elements
What is combustion reaction?This is a reaction in which a substance burns in air (oxygen) to produce carbon dioxide, CO₂ and water, H₂O
Considering the equation given
2C₈H₁₈ + 25O₂ —> 16CO₂ +18H₂O
we can see that C₈H₁₈ burns in air (oxygen) to produce carbon dioxide, CO₂ and water, H₂O
Thus, we can conclude that the reaction is not redox but an example of combustion reaction
Learn more about combustion reaction:
https://brainly.com/question/13134296
#SPJ2
write a balanced chemical equation for the reaction between iron and hydrochloric acid?and explain the foul smell
Answer:
Fe(s) + 2(H+ , Cl-)(aq) → (Fe2+ , 2Cl-)(aq) + H2(g)
Explanation:
If 14.8 L of ammonia (NH3) are collected at STP, how many moles of water have reacted?
__ mol H20
Li3N(S) + 3 H20(1) --> NH3(g) + 3 LiOH(aq)
**Report your answer to the correct number of significant digits!
Answer: what is it I need help
Explanation: step by step
Answer:
First you need to get liters to moles to mass. So 14.8 times 1 mol over 22.4 times the mole ratio 1:3 times molar mass over one mol. There you have it. Sorry I haven’t solved it yet and don’t know the right answer as soon as I do know I’ll edit this and say the correct answer
Explanation:
The day to day condition of atmosphere is known as
A) climate
B) weather
C) climactic zone
D) atmosphere pressure
Answer:
d) atmosphere pressure
Answer:
B.) weather
Explanation:
weather is constantly changing everyday and each day presents a new condition:)
Help This is due in 30 mins! PLEASE?
What climate condition occurs during El Niño?
dry heat throughout North America
warm water moving toward the coast of South America
heavy rain moving toward the coast of South America
flooding throughout North America
Answer:
flooding throughout North America
Explanation:
An El Niño condition occurs when surface water in the equatorial Pacific becomes warmer than average and east winds blow weaker than normal. The opposite condition is called La Niña. During this phase of ENSO, the water is cooler than normal and the east winds are stronger. El Niños typically occur every 3 to 5 years.
Hope this helps
Answer:
warm water moving towards the coast of South America
What happen when molten zinc bromide is electrolysised
Answer:
Molten lead bromide, PbBr 2(l), is an electrolyte. During electrolysis: Pb 2+ ions gain electrons at the cathode and become Pb atoms. Br - ions lose electrons at the anode and become Br atoms, which pair up to form Br 2 molecules.
Explanation:
hope it helps
Please answer as fast as possible
1. density of liquid: 1 g/cm³
2. density of unknown liquid: 2.7 g/cm³
Further explanationDensity is a quantity derived from the mass and volume
Density is the ratio of mass per unit volume
The unit of density can be expressed in g/cm³ or kg/m³
Density formula:
[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]
ρ = density
m = mass
v = volume
1
.[tex]\tt \dfrac{156-56}{100}=1~g/cm^3[/tex]
2.[tex]\tt \dfrac{27}{(\dfrac{30-20}{1}) }=2.7~g/cm^3[/tex]