Answer:
Explanation:The ratio of Coulomb force to gravitational force for an electron and a proton is given as,
r
1
=
R
2
Gm
1
m
2
4πε
0
1
×
R
2
q
1
q
2
=
6.67×10
−11
×9.1×10
−31
×1.67×10
−27
9×10
9
×(1.6×10
−19
)×(1.6×10
−19
)
=
1
2.27×10
39
The ratio of Coulomb force to gravitational force for two protons is given as,
r
2
=
R
2
Gm
2
4πε
0
1
×
R
2
q
1
q
2
=
6.67×10
−11
×(1.67×10
−27
)
2
9×10
9
×(1.6×10
−19
)×(1.6×10
−19
)
=
1
1.24×10
36
(b)
The magnitude of Coulomb force between electron and proton is given as,
F=
4πε
0
1
×
R
2
q
1
q
2
=
(10
−10
)
2
9×10
9
×(1.6×10
−19
)×(1.6×10
−19
)
=2.304×10
−8
N
The acceleration of electron is given as,
a
1
=
m
1
F
=
9.1×10
−31
2.304×10
−8
=2.5×10
22
m/s
2
The acceleration of proton is given as,
a
2
=
m
2
F
=
1.67×10
−27
2.304×10
−8
=1.4×10
19
m/s
2
Which of the following reactions depicts a decompostion reaction?
Answer:
B it is decomposition reaction
Explanation:
In decomposition reaction compound is broken into two or other elements
0. 820 mole of hydrogen gas has a volume of 2. 00 l at a certain temperature and pressure. What is the volume of 0. 125 mol of this gas at the same temperature and pressure?
The volume of 0.125 mole of the gas at the same temperature and pressure 0.30 L
Data obtained from the question Initial mole (n₁) = 0.82 moleInitial volume (V₁) = 2 LNew mole (n₂) = 0.125 molePressure = ConstantTemperature = ConstantNew Volume (V₂) =? How to determine the new volumeThe new volume can be obtained as illustrated below
PV = nRT
Divide both side by P
V = nRT / P
Divide both side by n
V / n = RT / P = Constant
Thus,
V₁ / n₁ = V₂ / n₂
2 / 0.82 = V₂ / 0.125
Cross multiply
0.82 × V₂ = 2 × 0.125
Divide both side by 0.82
V₂ = (2 × 0.125) / 0.82
V₂ = 0.30 L
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which experimental technique was most likely used by the students to determine the rate of reaction?
The most common way to monitor the rate of reaction is by observing the increase in the absorbance of the solution.
What is the rate of reaction?The rate of reaction is the rate at which reactants are converted into products or the rate at which the reactants disappear.
Given that the reaction is a colorimetric reaction, the most common way to monitor the rate of reaction is by observing the increase in the absorbance of the solution.
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Identify 3 chemicals that produce a potentially dangerous reaction with hydrochloric acid.
If 0.507J of heat leads to a 0.007 degree C change in water, what mass is present?
Answer:
17.25g
Explanation:
From our question, we have been asked to find the mass of water present.
The formula for finding specific heat is given by;
Q = mCp∆T
We have, Q = 0.507 J, ∆T = 0.007° C and we know that Cp of water is 4.2 J/g°C
Rearrange the formula making m the subject.
Which is given by;
m = (Q)/(Cp∆T)
Substituting for the known values
[tex]m \: = \frac{0.507}{4.2 \times 0.007}[/tex]
= 17.24489 g
= 17.25g
Answer:
17.32 gm
Explanation:
Specific heat of water is 4.182 J / g- c
4.182 J /g-c = .507/ ( .007 * gm)
solve for gm = 17.32 gm
A gaseous hydrogen is stored at 500 Bar and 25 oC in a composite storage with an internal volume of 220 liters. Determine the mass of the hydrogen in the tank. Use a compressibility factor Z
The mass of the hydrogen gas in tank, given the data is 6.17 Kg
Data obtained from the questionPressure (P) = 500 Bar = 500 × 0.986923 = 493.4615 atmTemperature (T) = 25 °C = 25 + 273 = 298 K Volume (V) = 220 L Gas constant (R) = 0.0821 atm.L/Kmol Compressibility factor (z) = 1.45Molar mass of hydrogen gas = 2.016 g/molMass of hydrogen gas (m) =? How to determine the mass
PV = znRT
Divid both sides by zRT
n = PV / zRT
but
mole (n) = mass (m) / molar mass (M)
Thus,
m / M = PV / zRT
m = MPV / zRT
m = (2.016 × 493.4615 × 220) / (1.45 × 0.0821 × 298)
m = 6169 g
Divide by 1000 to express in Kg
m = 6169 / 1000
m = 6.17 Kg
Complete question
A gaseous hydrogen stored at 500 Bar and 25°C in a composite storage with an internal volume of 220 liters. Determine the mass of the hydrogen in the tank. Use a compressibility factor Z = 1.45
3.06 kg
6.17 kg.
13.0 kg
5.05 kg
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n
What is an isotope?
why is the nitrogen important to humans
Nitrogen is important for all humans because it is a major part of amino acids, which are the building constituents of proteins and of nucleic acids such as deoxyribonucleic acid, which transfers genetic information to the next generation.
What is the nitrogen cycle?It is the biogeochemical circuit that supplies nitrogen to living things and keeps it circulating in the biosphere.
Importance of the nitrogen :
The nitrogen that is part of the atmosphere in the form of N₂ cannot be used by animals and plants, and for this reason, this mechanism is needed to convert the N₂ into usable forms.Following the order of the food chain, the nitrogen in the plants passes to the herbivorous animals and then to the carnivores, spreading between the different links of the food pyramid.Humans use nitrogen to make amino acids, proteins, nucleic acids, and DNA.Therefore, we can conclude that the nitrogen is a vital circuit for the existence of Humans and all other living organism since we are unable to fix nitrogen from its gaseous form.
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how can one establish whether a liquid sample extracted from a plant is pure
lewis acids and bases are most closely with which process?
Answer:
Lewis acids and bases are most closely associated with ELECTRON TRANSFER. A Lewis acid is defined as as a chemical specie that can accept an electron pair from a Lewis base to form a Lewis adduct while a Lewis base is defined as a specie which can donate an electron pair to a Lewis acid or an acceptor compound. Thus, Lewis base and acid has to do with electrons transfer.
Explanation:
An intravenous solution is noted as having a concentration of glucose equal to 0.312 M. What volume of solution (in mL) is needed to deliver 0.078 moles of glucose to the patient?
The volume of the solution in mL needed to deliver 0.078 moles of glucose to the patient is 250mL.
How to calculate volume?The volume of a solution can be calculated by using the following formula:
Molarity = n/V
Where;
n = number of molesV = volumeAccording to this question, an intravenous solution is noted as having a concentration of glucose equal to 0.312 M. The volume that will be needed is as follows:
volume = 0.078 moles ÷ 0.312M
volume = 0.25L = 250mL
Therefore, the volume of the solution in mL needed to deliver 0.078 moles of glucose to the patient is 250mL.
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Question 1 of 32
How does soil begin to form?
A. Rock particles clump together in an aggregate.
B. Sediment stays and settles in a location.
C. Bedrock breaks down into smaller particles.
D. Sediment moves to a new location.
Which of the following is an example of a change from gravitational potential
energy to kinetic energy?
A. Hands being rubbed together
B. A skater coasting up a ramp
C. Fuel being burned in a car engine
D. A person going down a waterslide
Answer:
D. A person going down a water slide
Explanation:
There is a store of gravitational potential energy when they are at the top of the waterslide which is then converted to kinetic energy as they travel down. The gravitational potential energy is transferred because the person loses height as they go down the slide
Samantha opened a tin of white paint. The paint consisted of a liquid and particles of titanium dioxide that are insoluble in the liquid.The paint had separated into two layers What type of substance in the titanium dioxide
Titanium dioxide is a type of mixture if particles of titanium dioxide are insoluble in the liquid.
What is a mixture?A mixture is composed of one or more pure substances in varying compositions.
A mixture is a material made up of two or more components joined together, but not chemically combined. In a mixture, a chemical reaction does not occur and each of its components maintains its identity and chemical properties.
A compound is a substance formed by the chemical combination of two or more different elements from the periodic table. The elements of a compound cannot be divided or separated by physical processes. They are not mixtures or alloys
An element is a type of matter made up of atoms of the same class. It is an atom with unique physical characteristics, a substance that cannot be decomposed by a chemical reaction.
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Citric acid (C6H8O7) is an important intermediate in the Krebs cycle and a triprotic acid. What is the normality of a solution made by weighing 128 g of citric acid into a volumetric flask and diluting it to 2 L with water
Answer:
2.67 N
Explanation:
The normality equation looks like this:
Normality = Molarity (M) x Number of Equivalents
In this formula, the number of equivalents represents how many moles of the acidic species exist in the molecule. In other words, how many hydrogen atoms are in citric acid? This value would be 8 equivalents (as denoted by the subscript).
So, to find the normality, you need to (1) convert grams C₆H₈O₇ to moles (via molar mass), then (2) calculate the molarity (via molarity equation using moles and volume), and then (3) calculate normality (via normality equation using molarity and # of eq.).
(Step 1)
Molar Mass (C₆H₈O₇): 6(12.011 g/mol) + 8(1.008 g/mol) + 7 (15.998 g/mol)
Molar Mass (C₆H₈O₇): 192.116 g/mol
128 g C₆H₈O₇ 1 mole
---------------------- x ---------------------- = 0.666 moles C₆H₈O₇
192.116 g
(Step 2)
Molarity = moles / volume (L)
Molarity = 0.666 moles C₆H₈O₇ / 2 L H₂O
Molarity = 0.333 M
(Step 3)
C₆H₈O₇ -----> 8 hydrogen atoms
Normality = molarity x number of equivalents
Normality = 0.333 M x 8
Normality = 2.67 N
A chemist divides a large sample of a mixture into three smaller portions. each of these portions contains different ratios of the component substances that make up the mixture. which description best fits the mixture? a. compound b. element c. heterogeneous mixture d. homogeneous mixture e. pure substance
A heterogeneous mixture is not uniform in composition. Hence, option C is correct.
What is a heterogeneous mixture?A heterogeneous mixture is a mixture in which the composition is not uniform throughout the mixture.
This substance is not an element or compound, because different components could be observed in the substance.
A pure substance is made up of only one type of atom (element) or only one type of molecule (compound), mixtures and solutions are made from two or more types of pure substances.
For example, aluminium is an element and ammonia is a compound.
This substance is not a homogeneous mixture, because different samples of the substance appeared to have different proportions of the components.
Hence, this substance is a heterogeneous mixture.
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Answer:
heterogeneous mixture
Explanation:
Use the periodic table to answer the following questions.
What is the predicted order of first ionization energies from highest to lowest for beryllium, calcium, magnesium, and strontium?
Be > Ca > Mg > Sr
Be > Mg > Ca > Sr
Ca > Sr > Be > Mg
Sr > Ca > Mg > Be
From the highest to lowest Ionization Energies for beryllium, calcium, magnesium, and strontium, the order is: Be > Mg > Ca > Sr
How to use the periodic table?Ionization energy is defined as a measure of the difficulty in removing an electron from an atom or ion or the tendency of an atom or ion to give off an electron.
Now, ionization energy usually decreases as it descends in a group. Thus, from the highest to lowest for beryllium, calcium, magnesium, and strontium, the order is determined as:
Be > Mg > Ca > Sr
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Answer: B (BE > MG > CA > SR)
Explanation: ON EDGE
the teacher prepares 2.50 liters (l) of a salt solution for a class experiment. how many quarts (qt) are in 2.50 l? (1 l =1.06 qt)
The amount of quarts in 2.50 L is 2.65 qt
How many quarts are in 2.50 l?Since the teacher prepares 2.50 liters of salt solution for a class experiment, we require how many quarts there are in 2.50 liters.
Since we know that 1 L = 1.06 qt, converting liters to quarts, we have
2.50 L = 2.50 × 1 L
= 2.50 × 1.06 qt
= 2.65 qt
So, the amount of quarts in 2.50 L is 2.65 qt
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In the nebular hypothesis, why did the nebula start to collapse?
1. List two features of the solar system that provide clues about its formation.
2. In the nebular hypothesis, why did the nebula start to collapse?
3. Describe how the sun formed, according to the nebular hypothesis.
4. How does the nebular hypothesis account for the formation of planets?
5. Based on the nebular hypothesis, why are the inner planets denser than the outer planets?
1.Four major features provide clues:
(1) The Sun, planets, and large moons generally rotate and orbit in a very organized way.
(2) With the exception of Pluto, the planets divide clearly into two groups: terrestrial and jovian.
(3) The solar system contains huge numbers of asteroids and comets.
(4) There are some notable exceptions to these general patterns.
2. Gravity causes the early solar nebula to collapse. The solar nebula flattens and warms at its core as it revolves. Within the spinning disk, planetesimals (early planets) begin to form.
3. Because the center of the revolving disk had the least amount of centripetal force, the majority of the mass from the nebula cloud was drawn to it by gravity. The majority of the material was hydrogen gas that was subjected to extreme pressure, which heated it to a critical point, causing it to fuse with another hydrogen atom, resulting in the formation of helium and the birth of the sun.
4. Nebular Theory: argues that when the Sun formed in the nebula, it created planets, asteroids, and other bodies from a spinning disk of materials known as the accretion disk. Almost all revolve in the same direction on their axes. Venus and Uranus are moving backwards on their axes.
5. In the inner solar nebula, only dense materials could condense. The Jovian planets are really denser than the terrestrial planets. Gravity compresses terrestrial planets to a greater extent, causing them to become denser. The gravity of the Sun drew dense materials into the inner solar system.
The nebular hypothesis has been given to states about the spinning dust cloud. The nebula started collapsing due to the force of gravity. It was formed by the rotation of the planets and celestial bodies.
What is a nebular hypothesis?The nebular hypothesis was to give the idea about the origin of the solar system based on dust and gases. According to the nebular hypothesis, the nebula started to collapse due to the force of gravity and the shock of the explosion from the Supernova.
The movement and rotation of the planets in orbits, revolutions, and motions suggest that the formation of the nebula along with asteroids and comets is the reason for its formation.
According to the hypothesis, the Sun was formed by the collapse of the heavy helium and hydrogen clouds that resulted in an increase in the temperature at the core and started to increase its temperature even more.
The hypothesis also accounts for the formation of the planets as the formation of the Sun and rotating dust and gases resulted in a rotating solar system that contained planets in it that was first released as planetesimals. The inner planets are denser compared to the outer planets because of the gravitation force.
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What mass of YCL3 forms when 10.0 grams of each reactant are combined?
The mass of [tex]YCl_3[/tex] that would be formed will be 18.22 grams
Stoichiometric calculationsLet us first look at the balanced equation of the reaction:
[tex]2Y + 3Cl_2 --- > 2YCl_3[/tex]
The mole ratio of Y to [tex]Cl_2[/tex] is 2:3.
Mole of 10.0 grams of Y = 10/88.9 = 0.11 moles
Mole of 10.0 grams [tex]Cl_2[/tex] = 10/71 = 0.14 moles
3/2 of 0.11 = 0.165. Thus, [tex]Cl_2[/tex] is limiting in availability.
Mole ratio of [tex]Cl_2[/tex] and [tex]YCl_3[/tex] = 3:2
Equivalent mole of [tex]YCl_3[/tex] = 2/3 x 0.14 = 0.093 moles.
Mass of 0.093 moles [tex]YCl_3[/tex] =0.093 x 195.26 = 18.22 grams
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What is the name of this molecule?
Answer:
The name of this molecule structure is 1-Butyne
The name of the given molecule according to IUPAC is 1-Butyne. Thus, option C is correct.
What is IUPAC nomenclature?The IUPAC nomenclature is given as the standard naming technique that is used to name a chemical compound. It is named with the following main rules.
The triple bond compound is an alkyne with the suffix -yne. The development of the name to the given structure is therefore given by counting the number of carbon atoms, and the location of the triple bond.
There are 4 carbon atoms in the structure with the triple bond at carbon 1, therefore the name will be 1-Butyne. Hence, option C is correct.
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what is the mass in grams of ba(io3)2 can be dissolved in 500 ml of water at 25 degrees celcius?
The mass of Ba(IO3)2 that can be dissolved in 500 ml of water at 25 degrees celcius is 2.82 g
What mass of Ba(IO3)2 can be dissolved in 500 ml of water at 25 degrees celcius?The Ksp of Ba(IO3)2 = 1.57 × 10^-9
Molar mass of Ba(IO3)2 = 487 g/mol?
Dissociation of Ba(IO3)2 produces 3 moles of ions as follows:
[tex]Ba(IO_{3})_{2} \leftrightharpoons Ba^{2+} + 2\:IO_{3}^{-}[/tex]
[tex]Ksp = [Ba^{2+}]*[IO_{3}^{-}]^{2}[/tex]
[tex][Ba(IO_{3})_{2}] = \sqrt[3]{ksp} =
\sqrt[3]{1.57 \times {10}^{ - 9} } \\ [Ba(IO_{3})_{2}] = 1.16 \times {10}^{-3} moldm^{-3}[/tex]
moles of Ba(IO3)2 = 1.16 × 10^-3 × 0.5 = 0.58 × 10^-3 moles
mass of Ba(IO3)2 = 0.58 × 10^-3 moles × 487 = 2.82 g
Therefore, mass Ba(IO3)2 that can be dissolved in 500 ml of water at 25 degrees celcius is 2.82 g.
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Which are the two major greenhouse gases?
OA. CO₂ and CH4
OB. 0₂ and H₂0
OC. CH₂0 and CO
OD. NO and NO₂2
Answer:
A. CO2 and CH4
The two major greenhouse gases are CO₂ and CH₄ and the correct option is option A.
What are Greenhouse Gases?Greenhouse gases are gases in Earth’s atmosphere that trap heat. They let sunlight pass through the atmosphere, but they prevent the heat that the sunlight brings from leaving the atmosphere.
These gases have the property of absorbing infrared radiation (net heat energy) emitted from Earth’s surface and reradiating it back to Earth’s surface, thus contributing to the greenhouse effect.
Each of these gases can remain in the atmosphere for different amounts of time, ranging from a few years to thousands of years.
Examples of greenhouse gases are carbon dioxide, methane and water vapour.
Therefore, the two major greenhouse gases are CO₂ and CH₄ and the correct option is option A.
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ls zinc qnd hydrogen chloride combining into sinc chloride and hydrogen gas a chemical or physical change?
Answer:
chemical because it turned into a new compound
Explanation:
is zinc and hydrogen chloride combining into zinc chloride and hydrogen gas a chemical or physical change?
physical change is like boiling, melting, freezing, and shredding
but its still the same compound
chemical is like it turns into something else like a new compound
Zn + 2HCl = ZnCl2 + H2(g)
Metal + Acid → Hydrogen + Acid Anion
new compound forms in this reaction
quora
Les McLean
toppr
What volume of a 3.95 M
potassium chloride solution would
be needed to make 325 mL of a
2.76 M solution by dilution?
[?] mL of 3.95 M KCl
Read about Flexon below. What scientific name is given to this kind of alloy?
Flexon :
Flexon is the trademarked name for a special material that is used to make frames for spectacles. It is light and extremely flexible. If it is bent it will 'remember' its original shape and return to it.
IBUPROFEN-400MG + PARACETAMOL-325MG is the scientific name Flexon.
What does Flexon mean?Flexon is the trademark for a shape memory alloy of titanium that is used to make eyeglass frames.
The metal alloy used by Flexon in their eyewear was actually destined for a very different path when, in 1961, US Naval Scientists creating a missile heat shield discovered that the alloy they were using automatically returned to its original shape, even after being hit by a hammer.
Flexon is the trademarked name for a special material that is used to make frames for spectacles. It is light and extremely flexible. If it is bent it will 'remember' its original shape and return to it.
Flexon eyeglasses are all made of memory metal titanium.
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two different substance can have the same properties
Yes, you're absolutely correct
what is chica's email
how are we (brainly users) supposed to know. unless its just me that doesn't know.
sorry that this isn't really much help. :/
Which of the following reactions depicts a synthesis reaction?
Answer:
C combination reaction (synthesis) reaction
Explanation:
two chemicals are combined
q5:- Some green food colouring was carefully added to the bottom of a beaker of water using a syringe. The beaker was then covered and left untouched for several days.
Describe what would you observe after:-
a)
i) a few hours
ii) several days
b) explain your answer to question 5a using ideas of the kinetic particle theory.
c) state the physical process that takes place in this experiment.
The molecules of the green food coloring would disperse throughout the water.
Diffusioni) In a few hours, the molecules of the green food coloring would have started dispersing throughout the water from the region of higher concentration to the region of lower concentration.
ii) In several days, the molecules would have uniformly dispersed through the water.
b) According to the kinetic theory of particles, matters, irrespective of their nature, are made up of small molecules that are in constant random motion. The direction and pace of movement depend on the energy they possess as well as the kind of relationship that exists between the small molecules.
c)The process that takes place in the experiment is known as diffusion.
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