Answer:
To calculate the no. of moles you must know mass and molar mass of the product
Explanation:
# of moles = mass/molar mass
The radioactive decay of Uranium-238 releases alphas particles and results in a mass change of 0.135 g. Determine the amount of energy released by this reaction
a) 1.22 x 10^13J
b) 1.22 x 10^16J
c) 4.05 x 10^4J
d) 4.05 x 10^7J
This question involves the concept of binding energy.
The amount of energy released by this reaction is "a) 1.22 x 10¹³ m/s".
What amount of energy is released?The amount of energy that is released during the radioactive decay of any element is known as binding energy. This can be given by using the following formula:
[tex]E=\Delta mc^2[/tex]
where,
E = energy released = ?Δm = mass change = 0.135 g = 1.35 x 10⁻⁴ kgc = speed of light = 3 x 10⁸ m/sTherefore,
E = (1.35 x 10⁻⁴ kg)(3 x 10⁸ m/s)²
E = 1.22 x 10¹³ m/s
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Two identical metal spheres at 8 °C are put in equal amount of water in two beakers, as shown below.
Two beakers are side by side; one is labeled Beaker A and the other is labeled Beaker B. Both beakers are the same shape, size, and are about two-thirds full with water. Both beakers have a metal sphere with a temperature of eight degrees Celsius submerged in the water.
Heat flows from the metal sphere to the water in Beaker A and from the water to the metal sphere in Beaker B. Which statement is correct? (4 points)
The temperature of the water is greater than 8 °C in Beaker A.
The temperature of the water is lower than 8 °C in Beaker B.
The temperature of the water in Beaker A will increase.
The temperature of the water in Beaker B will increase.
Answer:The temperature of the water in both beakers is greater than 8 °C. in beaker B
Explanation:
What is the total number of moles of solute in 2.0 liters of 3.0 m naoh
a) 1.0 mole
b) 2.0 moles
c) 3.0 moles
d) 6.0 moles
Answer:
d) 6.0 moles
Explanation:
M = moles of solute/liters of solution
3 0M = x/2.0
2.0L×3 0M = x/2.0L×2.0L
6.0 moles = x
Use the information in the tables to determine whether the solution of the salt formed from the given acid base combinations will be acidic, basic, or neutral. hcl naoh: hcl nh4oh: ch3cooh koh:
The table should be included, but that's okay
hcl naoh: salt neutral (both strong)
hcl nh4oh: salt acidic(strong acid+weak base)
ch3cooh koh: salt basic(weak acid+strong base)
In a spontaneous fission reaction, the total mass of the products is _______________ the mass of the original elements.
Explanation:
is equal to the mass of the original elements
Based on log rules and the way ph is calculated, what is the difference in [oh– ] concentration between point a and point b. 101 105 106 107
Based on their pOH values, the difference in [OH– ] concentration between point A and point B is 10^6.
What is pH of a substance?The pH is determined by the concentration of Hydrogen ions [H+]. The higher the concentration of H+ ions, the lower the pH of a substance. If the concentration of H+ is greater than OH-, the material is acidic, i.e. the pH value is less than 7
In this case, the formula for this will be:
[tex]pH= -log[H+][/tex]
So we have:
[tex][OH]= 14-1= 10^{-13}\\[OH] = 14-7=10^{-7}[/tex]
Therefore, the difference in [OH– ] concentration between point A and point B is 10^6.
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Answer: 10^6
Explanation: edge2023
One atom has 11 protons and 13 neutrons. Another has 11 protons and 12 neutrons. Are they the same or different elements?
Answer:
deferent elements
Explanation:
because 11n 12 is not the same as well as13
Answer: They are the same elements
Explanation:
They're same elements because the number of electrons are same (number of protons=electrons).
The number neutrons don't matter.
If any two atoms have the same number of Electrons and protons and has different number of neutron's they still are the same element.
Which of the following ions is formed when the positive hydrogen ions from an acid bond to water molecules?
H−
OH−
H2O+
H3O+
Answer:
H20 +
Explanation:
The ion that is formed when the positive hydrogen ions from an acid bond to water molecules is H₂O⁺. The correct option is C.
What are hydrogen ions?
Hydrogen is an element that is present in the first place on the periodic table, and its atom's number is 1. The nucleus of hydrogen contains only one electron, and it contains a positive 1 charge.
Hydrogen is called hydrogen ion when it participates in any chemical reactions. They become charged and participate in electron bonding to form compounds.
The positive Hydrogen ions, when forming a bond to water molecules, will be represented as H₂O⁺ because hydrogen only contains a positive charge on it. The unit positive charge on the hydrogen is the proton present in its nucleus.
Thus, the correct option is C. H₂O⁺
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Convert 65 grams of oxygen to moles
65 grams of oxygen is approximately equal to 2.03125 moles.
To convert 65 grams of oxygen to moles, we need to use the molar mass of oxygen (O₂), which is approximately 32.00 g/mol. Oxygen exists as a diatomic molecule (O₂), so we use the molar mass of O₂ to convert from grams to moles.
The formula for converting grams to moles is:
Moles = Mass (in grams) / Molar mass (in grams per mole)
Given:
Mass of oxygen = 65 grams
Molar mass of oxygen (O₂) = 32.00 g/mol
Moles of oxygen = 65 grams / 32.00 g/mol
Moles of oxygen ≈ 2.03125 moles
Therefore, 65 grams of oxygen is approximately equal to 2.03125 moles.
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If you could travel to any TIME PERIOD, when would go and why.
Answer:
I Would Go Back To When There Were Cavemen Because I Would Love To See How Things Went On And How Women/Men Handled Themselves
Explanation:
Why Would I Travel To When Cavemen Were Here?
Because I Have A Fuji Film And I Would Love To Come Back To This Day And Show Everyone That Cavemen/Dinosoars ARE Real
distance in space is measured in
A helium balloon with an internal pressure of 1.00 atm and a volume of 4.50 L at 20.0˚C is released. What volume will the balloon occupy at an altitude where the pressure is 0.600 atm and the temperature is –20.0˚C?
GAS LAW:
Given:
Unknown:
Formula:
Solution:
FInal Answer: V2 =
trru or false
The atomic number for lithium is 17.
Answer:
False; the correct atomic number for lithuim is 3
Explanation:
Answer to back it up
~rere
Compare the properties of the four state of matter in terms of particle arrangement, particle motion, shape,
size, and compressibility
Solid-
shape-retains a fixed volume and shapenot easily compressibledoes not flow easily , Particles in a solid are tightly packed, usually in a regular pattern. Particles in a solid vibrate (jiggle) but generally do not move from place to place.liquid-
shape-assumes the shape of the part of the container which it occupiesnot easily compressibleParticles in a liquid are close together with no regular arrangement. Particles in a liquid vibrate, move about, and slide past each other.Gas-
shape-assumes the shape and volume of its containercompressibleParticles in a gas are well separated with no regular arrangement. Particles in a gas vibrate and move freely at high speeds.Plasma-
shape-variable volume and shapePlasma is slightly different from the other phases of matter, in that the high temperatures cause the atoms/particles to break apart into electrons and nuclei. This mixture of electrons and nuclei act similarly to gas particles, moving freely and have no distinct arrangement.3 Apply Use context clues to write your own definitions for the words definite and occupy.
Example sentence
Solid is the state of matter that has a definite shape and volume.
definite:
__________
Example sentence
A larger container will allow a gas to occupy more space.
occupy:
__________
Answer:
Explanation:
own definitions for the words definite and occupy.
Example sentence
Solid is the state of matter that has a definite shape and volume.
definite:
__________
Example sentence
A larger container will allow a gas to occupy more space.
occupy:
For your experiment in part B, which factors would you keep constant?
Heating Different Amounts of a Substance
Use the word bank below to complete the statement. Not all of the words will be used.
Word Bank:
sum. Enthalpy. Heat. Total.
Temperature. Moles. -ΔH. +ΔH.
Hess’s Law describes how the ____ energy of a reaction consists of the ___ of the energy changes of the individual step reactions.
Hess’s Law describes how the heat energy of a reaction consists of the total of the energy changes of the individual step reactions.
What is the statement if Hess's law of constant heat summation?Hess's law of constant heat summation states that the total heat changes that occur in a reaction is independent of the several intermediate pathways of the reaction, but is a sum of all the heat changes that occur.
Hess’s Law describes how the heat energy of a reaction consists of the total of the energy changes of the individual step reactions.
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1 Defing polymerization
Answer:
Polymerization, any process in which relatively small molecules, called monomers, combine chemically to produce a very large chain-like or network molecule, called a polymer. The monomer molecules may be all alike, or they may represent two, three, or more different compounds.
Explanation:
:^)
Joanne added iron filings to copper sulphate solution. she observed the reaction after one week. what is the name of the compound formed in this reaction?
The iron filings react with copper sulfate, the copper is displaced and iron sulfate results.
Copper sulfate + Iron reactionThe reaction between iron filings and copper sulfate is represented by the equation below:
[tex]Fe + CuSO_4--- > FeSO_4 + Cu[/tex]
The iron filings displace the copper from copper sulfate to form iron sulfate. Thus, elemental copper and iron sulfate are formed.
Iron is able to displace copper from copper sulfate because iron ranks higher than copper in the reactivity series.
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What’s the question??
Answer:
the phenotype of TT is the right answer
A photon of light has a wavelength of 0.050 cm. Calculate its energy.
Answer:
3.96×10^−22J
Explanation:
First find the frequency of the photon from the equation
c=fλ
∴f=c/λ
=3×10⁸m/s / 0.050×10^−2m
=6×10¹¹Hz.
Energy of such photons is quantized and given by
E=hf
=(6.6×10^−34)(6×10¹¹)
=3.96×10^−22J
Among electromagnetic waves, UV rays are most dangerous because exposure to these radiation cause serious problems in living organism. The energy of photon is 3.96×10⁻²²J.
What is electromagnetic wave?Electromagnetic wave is a wave which contain two component one is electric component and other is magnetic component. The electric and magnetic component are perpendicular to each other. There are so many wave that comes under electromagnetic wave like infrared wave , radio wave
There is a relation between energy of wave. frequency of wave, and wavelength of wave
Mathematically,
E=hc/λ
where,
E = energy of electromagnetic wave
h is planks constant having value 6.67×10⁻³⁴js
c is speed of light that is 3×10⁸m/s
λ is the wavelength of electromagnetic wave
frequency=speed of light/wavelength
=3×10⁸m/s / 0.050×10⁻²m
=6×10¹¹Hz.
E=h×frequency
=(6.6×10⁻³⁴)(6×10¹¹)
=3.96×10⁻²²J
Therefore, the energy of photon is 3.96×10⁻²²J.
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describe one advantage and one disadvantage of obtaining energy from nuclear fission
Answer:
one advantage: no air pollutants, one disadvantage: gives off radioactive waste
A police siren passes you with a frequency of 5000 Hz. Which correctly describes the sound wave after the police car passes you? The speed of sound is 340 m/s.
A. siren wavelength of 0.0068 meters, frequency you hear = less than 5000 Hz
B. siren wavelength of 0.0068 meters, frequency you hear = 5000 Hz
C. siren wavelength of 0.0068 meters, frequency you hear = more than 5000 Hz
D. siren wavelength of 5000 meters, frequency you hear = 5000 Hz
Answer:
siren wavelength of 0.0068 meters, frequency you hear = less than 5000 Hz
Explanation:
Q.A police siren passes you with a frequency of 5000 Hz. Which correctly describes the sound wave after the police car passes you? The speed of sound is 340 m/s.
(a) siren wavelength of 0.0068 meters, frequency you hear = less than 5000 Hz
(using doppler's effect)
What is the Doppler effect?Doppler effect is the apparent difference between the frequency at which sound or light waves leave a source and that at which they reach an observer, caused by the relative motion of the observer and the wave source.
Who discovered the Doppler Effect?Christian Johann Doppler, an Austrian mathematician, and physicist discovered the Doppler effect in 1842.
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Why do ice cubes float to the top of a glass of water.
Answer:
Since the water is heavier, it displaces the lighter ice,
Explanation:
hope that helps
The original amount of a radioactive sample should be multiplied by which expression to calculate the amount of the sample that remains after n half-lives have passed? (one half) times n. (startfraction 1 over n endfraction) squared. (one half) superscript n. startfraction 1 over (2 n) endfraction.
The original amount of a radioactive sample should be multiplied by (one half) superscript n to calculate the amount remaining.
What is half-life?This is the time taken for half a substance to decay.
Description of number of half-livesThe number of half-lives a substance has undergone is related to its original amount as and amount remaining according to the following equation:
N = N₀ × (½)ⁿ
Where
N is the amount remainingN₀ is the Original amount n is the Number of half-livesFrom the above equation, we can conclude that the original amount of a radioactive sample should be multiplied by (one half) superscript n
to calculate the amount remaining.
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Answer:
c. (1/2)^n
Explanation:
Sally fell off of her bike and scraped her knee. What cellular process would aid in the healing of her scrape? Group of answer choices meiosis mitosis
Answer:
Mitosis
Explanation:
you scrape your knee and the skin repairs itself
What is the process of removing salt from seawater.
Answer:
Explanation:
Process of desalination is used to remove salt from seawater for provision of fresh water
ANSWER THIS QUESTION PLEASE!
Calculate the molarity of a 1.0l solution that contains 96g of nahco3
Answer:
1.1 M
Explanation:
The formula mass of sodium hydrogen carbonate is about 23+1+12+3(16)=84 g/mol, so 96 g is about 1.142 mol.
molarity = (moles of solute)/(liters of solution) = 1.1 M
How many moles are in 1.24 * 10^25 of carbon?
Answer:
2.059800664 x 10^47 moles
Explanation: