Energy is needed to break bonds, is the best exemplifies the interaction of energy with chemical bonds.
What is chemical bond?
An enduring attraction between ions or atoms known as a chemical bond is what allows molecules and crystals to form. The bond may be created by the sharing of electrons in covalent bonds or by the electrostatic attraction of two oppositely charged ions, as in ionic bonds. Covalent, ionic, and metallic bonds are examples of "strong bonds" or "primary bonds," whereas dipole-dipole interactions, the London dispersion force, and hydrogen bonding are examples of "weak bonds" or "secondary bonds." The sharing or exchange of electrons between the involved atoms results in strong chemical bonds. The negatively charged electrons that surround the nucleus as well as the positively charged protons that make up a nucleus are attracted to one another because opposite electric charges are attracted to one another.
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What concentration of CH3NH3Br is necessary to buffer a 0.18 M CH3NH2 solution at pH = 10.00?
(The Kb for CH3NH2 is 4.4 x 10 -4)
The concentration of the specie is obtained as 0.79 M.
What is the concentration?We know that a buffer is a solution that is resistant to changes in acidity and alkalinity. Now, we know that we have the following information;
pH = 10.00
Concentration of base = 0.18 M
Kb = 4.4 x 10 -4
Hence;
pOH = 14 - 10.00 = 4
pKb = -log( 4.4 x 10 -4) 3.36
Using the formula;
pOH = pKb + log [A-/AH]
4 = 3.36 + log[A-/0.18]
4 - 3.36 = log[A-/0.18]
Antilog(4 - 3.36) = [A-/0.18]
A- = Antilog(4 - 3.36) * 0.18
A- = 0.79 M
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how do you think we can change freedom of movement in molecules.
We can change the freedom of movement in molecules of a substance by the addition or removal of heat.
What are molecules?Molecules are the smallest particles of a substance that are capable of independent existence and that still retain the properties of that substance.
The movement of the molecules of a substance is dependent on the strength of the force of attraction between the molecules of the substance.
The stronger the attractive forces between the molecules of a substance, the less free the molecules of the substance will be to move.
The molecules of a substance can acquire energy to overcome these attractive forces when heat is added to the substance.
Hence, an increase or decrease in the temperature of a substance will change the movement of the molecules of the substance.
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Use the periodic table to determine which of the following could be an isotope of bromine (Br). Check all that apply.
Z = 79, A = 196
Z = 35, A = 79
A = 79, N = 44
Z = 44, N = 44
The isotopes of bromine from the options would be Z = 35, A = 79.
What are isotopes?Isotopes are atoms of the same element with the same atomic number but different neutron numbers.
The atomic number of an atom is the number of protons present in the nucleus of the atom. Since elements are arranged according to their atomic number on the periodic table, isotopes of the same element will occupy the same position on the periodic table.
Now, considering the isotope of bromine (Br). The atomic number is 35. The atomic number is denoted as Z on the periodic table. The normal bromine atom has a mass number of 80. With 35 as the number of protons, the number of neutrons can be calculated as:
80 - 35 = 45.
Considering an atom with Z = 35, A = 79, means the atomic number is 35, which means it is a bromine atom. The mass number is 79 instead of 80.
79 - 35 = 44.
This means that the atom has 44 as the neutron number instead of 45. Thus, Z = 35, A = 79 is the only isotope of bromine.
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Calculate the energy, in kJ, is required to completely melt 20.0 g of ice initially at -45.0 °C.
Energy, in kJ, is required to completely melt 20.0 g of ice initially at -45.0 °C is 4.147kJ
Energy is the capacity for doing work
Here given data is
Mass = 20.0 g
Temprature = -45.0°C
Molar heat of fusion of ice = 6.02 kj/mol
We have to calculate energy in kJ = ?
Then q = n×ΔH
q = heat
n = number of moles
ΔH = enthalpy
First we calculate the m=number of moles
Number of moles = mass / molar mass
Number of moles = 12.4 g/ 18 g/mol
Number of moles = 0.69 mol
Now put this value in formula
q = n × ΔH
q = 0.69 mol×6.02 kj/mol
q = 4.147kJ
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Find the volume of 0.240 M sulfuric acid necessary to react completely with 75.5 g sodium hydroxide.
The volume of the 0.240M sulfuric acid required to completely react with sodium hydroxide will be
Firstly we will write the correct balanced equation for the reaction:
2NaOH + H₂SO₄ ==> Na₂SO₄ + 2H₂O
Next, determine moles of NaOH present:
75.5 g NaOH x 1 mole NaOH/151 g = 0.5 moles NaOH
Next, determine number of moles H₂SO₄ needed to react with 0.5 moles NaOH,
0.5 moles NaOH x 1 mole H₂SO₄ /2 moles NaOH = 0.25 moles H₂SO₄ needed
Finally, calculate the volume of H₂SO₄ needed to provide 0.25 moles H₂SO₄:
(0.240 mole/L)(x L) = 0.25 moles
Molarity= 0.25/ volume
volume = 0.25/ molarity
= 0.25/ 0.24
=1.04 L
= 1040 mL
So, the volume of the given solute required to completely react with sodium hydroxide will be 1040 mL.
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How many moles of a gas are in a 4.2L container at 310K at 0.36atm? *
*R value = 0.082 (atm x L)/ (mol x K)
0.357 mol
0.0594 mol
O1.872 mol
M
Considering the ideal gas law, the correct answer is the second option: 0.0594 moles of a gas are in a 4.2L container at 310K at 0.36atm
Ideal gas lawAn ideal gas is called a hypothetical or theoretical gas, which would be composed of particles that move randomly and without interacting with each other.
The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:
P×V = n×R×T
where:
P is the gas pressure.V is the volume that occupies.T is its temperature.R is the ideal gas constant. The universal constant of ideal gases R has the same value for all gaseous substances. n is the number of moles of the gas.Amount of moles in this caseIn this case, you know:
P= 0.36 atmV= 4.2 Ln= ?R= 0.082 (atm×L)/(mol×K)T= 310 KReplacing in the ideal gas law:
0.36 atm× 4.2 L = n× 0.082 (atm×L)/(mol×K)× 310 K
Solving:
(0.36 atm× 4.2 L)÷ (0.082 (atm×L)/(mol×K)× 310 K)= n
0.0594 moles= n
Finally, the number of moles of gas is 0.0594 moles.
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Acetone has a density of 0.7857 g/cm3. What would be the volume in mL of acetone if the mass was 0.3201lbs?
An acetone with a density of 0.7857 g/mL and a mass of 0.3201 lbs will have a volume of 184.796 mL.
What is density?
The density of a substance is a function of its mass and volume. The variables are related to each other, such that:
Density = mass/volume.
Thus, given any two of the 3 variables, the third variable can be calculated by making it the subject of the formula.
Now to the problem at hand. The acetone has a density of 0.7867 g/mL and a mass of 0.3201 lbs. Because the unit of density is g/mL, the mass in lbs first needs to be converted to grams.
1 lb = 453.592 grams
0.3291 lbs = 0.3201 x 453.592
= 145.194 grams
Now, let's make volume the subject:
volume = mass/density
= 145.194/0.7857
= 184.796 mL
In summary, acetone with a density of 0.7857 g/mL and a mass of 0.3201 lb will have a volume of 184.796 mL.
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The mass spectrum of an organic molecule is shown below with m+ peak explain the presence of the second peak labelled m+1
M+1 peak is a small line 1 m/z unit to the right of the main molecular ion peak and the small peak is called as M+1 peak
Mass spectrum is a analytical tool useful for measuring the mass to charge ratio means m/z of one or more molecules present in a sample and these measurement can often be used to calculate the exact molecular weight of the sample components as well and M+ peak is usually the highest intensity peak in the cluster of peak at highest m/z and M+1 peak is a small line 1 m/z unit to the right of the main molecular ion peak and the small peak is called as M+1 peak
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please help !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
Most likely A
PLEASE GIVE BRAINLIEST THANK YOU!!!
¿What is a sulphurous gas?
¿What is a sulphurous gas?
Sulfur dioxide (SO) is a colorless gas with a pungent odor particular. Also called sulfite, it was used from centuries ago and its purpose is to preserve the aromas of the wine and the elimination of bacteria. It is also used in preservatives and antioxidants, and the food industries
They use it in dried fruit juices, jams and juices.
What is this compound
Answer:
Boron trifluoride |
Explanation:
Boron trifluoride is a colorless gas
18- Separate the following mixtures by using sep-
aration methods, and indicate the minimum amount
of steps necessary for separation.
a. Chalk dust + table salt
b. Iron powder + water + wood
c. Alcohol + water + pepper
Explanation:
A mixture of a solid and a liquid
The small clay particles become suspended in the water. This kind of mixture is called a suspension. Suspensions are opaque; that means they are cloudy and we cannot see through them very well. The sugar dissolves in the water and the mixture is called a solution. Solutions are clear; that means we can see through them.
A mixture of a liquid and a liquid
Milk is not a single substance, but actually a mixture of two liquids! The one liquid component in milk is water, and the other is fatty oil. The reason milk is opaque is that tiny droplets of the oil is suspended in the water. When some liquids are suspended in liquid, we call the mixture an emulsion. Like suspensions, emulsions tend to be opaque.A mixture of vinegar and water is clear, and that is a clue that the mixture is a solution.
Solutions are special kinds of mixtures in which the particles are so well mixed that they are not separated from each other. We cannot make out separate substances.
A mixture of a gas and a gas
We learnt in that Materials that the particles of gases are far apart. This means that gases can mix very easily, because it is easy for their particles to move in amongst each other. The air we breathe is not a single gas but actually a mixture of gases
Consider the following equilibrium system:
2HI ⇌ H2 + I2
At constant temperature and volume, more I2 is added to the above equilibrium. A new state of equilibrium results from a shift to the:
A) Left with a net decrease in [H2]
B) Left with a net Increase in [H2]
C) Right with a net decrease in [H2]
D) Right with a net increase in [H2]
At constant temperature and volume, more I2 is added to the above equilibrium. A new state of equilibrium results from a shift to the:
Left with a net decrease in [H2].
Hence, Option A is correct .
What do you mean by equilibrium in chemistry?
Chemical equilibrium, can be defined as the reversible chemical reaction in which there is no net change in the amounts of reactants and products. Types of chemical equilibrium are Homogeneous Equilibrium and Heterogeneous Equilibrium
It plays a important role in chemical reaction
It tells us about direction of chemical reaction. It leads in setting up of certain desired products. It helps in calculation of composition of final reactionRate of forward reaction = Rate of backward reaction.
Hence , At constant temperature and volume, more I2 is added to the above equilibrium. A new state of equilibrium results from a shift to the:
Left with a net decrease in [H2].
Hence, Option A is correct .
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Predict the products of the following reaction:
HCN + RbOH
Answer:
Rubidium Cyanide and Water
Explanation:
Fill in the blanks to complete the table
The atomic number(Z) is equal to the number of protons to equal to number of electrons.
The number of neutrons is equal to atomic mass minus the atomic number
n=A-Z
For Zn^2+, Z=28, e=28
For iron, Z=25,A=55
The number of neutrons is 55-25=30
The charge is zero
For O^2-, Z=8+2=10, n=p=10
The number of neutrons is 16-10=6
For sulfur, Z=16,A=34
For S2-, Z=16+2=18, A=34
The charge is 2-
The atomic number is the basis of the periodic table.It is equal to the number of protons.The number of neutrons is atomic mass minus atomic number.To learn more about atomic number visit:
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Part A
Draw the Lewis structure for H3COCH3
Draw the molecule by placing atoms on the canvas and connecting them with bonds. Include all lone pairs of electrons. Include all hydrogen atoms.
IC
Q
Lewis structure is a very simplified representation of the valence shell electron in a molecule
For Lewis structure of acetone then calculate the total number of valence electron for the acetone molecule and after determining how many valence electron there are in acetone and place them around the central atom to complete the octet and there are total 24 valence electron in the Lewis structure for acetone and it is used to show how electron are arranged around individual atom in molecule and electron are shown as dot or for bonding electron as a line between the two atom
The Lewis structure of acetone are shown below
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What is the mass of 2.00 moles of Ca(OH)2?
Answer:
(e) 148.2. However, it should be expressed only to 3 significant figures since 2.00 only has 3.
Oxygen is inhaled to the lungs, and brought into the blood, which is a . Our bodies exchange the oxygen for carbon dioxide, which is a . The carbon dioxide is forced out of lungs by increasing the pressure of the lungs.
Oxygen is inhaled to the lungs, and brought into the blood, which is known as diffusion . Our bodies exchange the oxygen for carbon dioxide, which is called respiration .The carbon dioxide is forced out of lungs by increasing the pressure of the lungs.
What is meant by respiration?Respiration can simply be defined as the exchange of gases between an organism and its environment. In order words, it refers to the breathing in of oxygen and breathing out of carbon dioxide.
That being said, some few categories, levels or classes of respiration are known in living organisms:
External respirationInternal respirationAerobic respirationAnaerobic respirationSo therefore, we can now confirm from the simple note given above that when substances such as oxygen moves from a region where it is highly concentrated to a region where it is of a lesser amount, it is known as diffusion.
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Macmillan Learning
A 2.95 L container at 734 °C contains 5.10 g of N₂0,(g). The N₂O, gas decomposes completely, producing NO₂(g) and
NO(g). Assuming the container volume and the temperature do not change, calculate the pressure of the gas mixture after the
complete decomposition of N₂O,.
The container volume and the temperature do not change, the pressure of the gas mixture after the complete decomposition of N₂O is 3 atm.
The reaction is given as :
2N₂O ----> 2N₂ + O₂
volume = 2.95 L
temperature = 734 + 273 = 1007 K
mass = 5.10 g
moles = mass / molar mass
= 5.10 / 44
= 0.11 mol
using ideal gas equation here:
P V = n RT
P = (0.11 × 0.082 × 1007) / 2.95
P = 3 atm
Thus, The container volume and the temperature do not change, the pressure of the gas mixture after the complete decomposition of N₂O is 3 atm.
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For each of the substances below, label them as acids (A), bases (B), or neutral (N), then place them where they best belong on the pH scale. You may need to research some substances' pH if you are not familiar with them.
__ baking soda
__ Vinegar
__ Distilled water
__ “Pure” rain
__ Ammonia
__ Lemon juice
__ Hair and skin
To research some substances pH 0 to less than 7 is acidic, 7 is neutral and more than 7 is neutral.
baking soda - base
Vinegar - acid
Distilled water - neutral
Pure rain - neutral
Ammonia - nasic
Lemon juice - acid
Hair and skin - acidic
An acid is a molecule or ion capable of both donating a proton, referred to as a Brønsted–Lowry acid, or forming a covalent bond with an electron pair, known as a Lewis acid. the first class of acids are the proton donors, or Brønsted–Lowry acids.
An acid is any substance that in water answer tastes sour, adjusts blue litmus paper to red, reacts with a few metals to liberate hydrogen, reacts with bases to form salts, and promotes chemical reactions (acid catalysis). An acid is a substance that produces hydrogen (H+) ions when it's far delivered to water. A hydrogen ion is simply the proton and no electron
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Q5: If you were to sketch another graph on top of this one, how the graph would look if you pulled the
stick back further?
If there are any actual values of x for which f(x) = zero then the curve isn't always absolutely above or beneath the axis.
Check the values of y. All values positive -> curve is above y-axis. All values negative -> curve is beneath y-axis. There also are different cases. The curve might (for example) intersect the x-axis.
Adding to the output of a feature actions the graph up. Subtracting from the output of a feature actions the graph down. Here are the graphs of y = f (x), y = f (x) + 2, and y = f (x) - 2.
If the slope of f(x) is negative, then the graph of f'(x) might be beneath the x-axis. If the slope of f(x) is positive, then the graph of f'(x) might be above the x-axis. All relative extrema of f(x) turns into x-intercepts of f'(x).
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Which naming rule would apply to CaCO3?
Answer:
A metal + polyatomic anion.
Explanation:
If a sample of a certain solution is determined to have a pH of 11.4, what is the concentration of [H3O+] in the solution? Write your answer in scientific notation and
round the significand to two decimal places.
Answer
The pH of acid is between 0-7 on pH scale while for base pH range is from 7-14. Therefore, the concentration of [H3O+] in the solution is [tex]10^{11.4}[/tex]. pH is a unitless quantity
What is pH?pH is a measurement of amount of hydronium ion H₃O⁺ in a given sample. More the value of hydronium ion concentration, more will be the solution acidic.
On subtracting pH from 14, we get pOH which measures the concentration of hydroxide ion in a given solution. pH depend on the temperature. At room temperature pH scale is between 0 to 14. pH of neutral solution is 7.
Mathematically,
pH=-log[H⁺]=11.4
Solving this
[H⁺]=[tex]10^{11.4}[/tex]
Therefore, the concentration of [H3O+] in the solution is [tex]10^{11.4}[/tex].
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1. How many days would it take to count 10Lb of rice grains? A single grain of rice weighs 0.000064 lb (6.4x10-5 lb) Assume: 1grain/second
If a single grain of rice weighs 0.000064 lb and assuming 1 grain of rice is counted per second, the number of days to count 10 lb of rice would be 1.8084 days.
Dimensional analysisAccording to the analysis:
1 grain = 0.000064 lb
This means that 0.000064 lb is counted per second according to the rate given.
There is a total of 10 lb of rice, how many 0.000064 lb can be deducted from 10 lb?
10/0.000064 = 156250
In other words, there are 156250 grains of rice in total.
1 grain = 1 sec
How many seconds will it take to count 156250 grains?
156250 x 1 = 156250 seconds
60 seconds = 1 minute
60 minutes = 1 hour
124 hours = 1 day
Total number of seconds in a day (24 hours) = 60 x 60 x 24
= 86400 seconds
So, how many 86400 seconds can be deducted from 156250 seconds?
156250/86400 = 1.8084
Thus, it will take a total of 1.8084 days to count 10 lb of rice grains.
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How many liters of O2 are needed to react completely with 10.0 L of H2s at STP?
2H2S(g) + 3O2(g) --> 2SO2(g) +2H20(g)
Taking into account the reaction stoichiometry,14.9856 L of O₂ are needed to react completely with 10.0 L of H₂S at STP?
Reaction stoichiometryIn first place, the balanced reaction is:
2 H₂S + 3 O₂ → 2 SO₂ + 2 H₂O
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
H₂S: 2 molesO₂: 3 molesSO₂: 2 molesH₂O: 2 molesSTP conditionsThe STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.
Volume of O₂ requiredFirst of all, you know that 10.0 L of H₂S react at STP. You can apply the following rule of three: if by definition of STP conditions 22.4 L of H₂S are occupied by 1 mole, 10 L of H₂S are occupied by how many moles?
moles of H₂S= (10 L× 1 mole)÷ 22.4 L
moles of H₂S= 0.446 moles
To calculate the number of moles of O₂ required, the following rule of three can be applied: If by reaction stoichiometry 2 moles of H₂S react with 3 moles of O₂, 0.446 moles of H₂S react with how many moles of O₂?
moles of O₂= (0.446 moles of H₂S× 3 moles of O₂)÷2 moles of H₂S
moles of O₂= 0.669 moles
Now, you can apply the following rule of three: if by definition of STP conditions 1 mole of O₂ occupies a volume of 22.4 liters, 0.669 moles occupies how much volume?
volume= (0.669 moles× 22.4 L)÷ 1 L
volume= 14.9856 L
Finally, 14.9856 L of O₂ are needed.
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Help me on this question
Answer:
Example problem
Explanation:
A 6.00 L sample at 25.0 °C and 2.00 atm contains 0.500 mol of gas. If we add 0.250 mol of gas at the same pressure and temperature, what is the final total volume of the gas?
Solution
The formula for Avogadro's law is:
V1/n1=V2/n2
V1=6.00 L
n1=0.500 mol
V2=?
;m
ml
n2=0.500 mol + 0.250 mol = 0.750 mol
V2=V1×n2/n1
V2=6.00 L×0.750mol
0.500
mol=9.00 L
Learn at brainlyAn electrical heater delivers 7.070 kJ of energy (as heat) to a system consisting of the gas inside a cylinder having a movable piston. As a result, the piston moves against a constant external pressure such that P ∆V = 1.414 kJ. What is the change in internal energy for the system?
Answer to the nearest 0.001 kJ.
The change in internal energy for the system is 5.656 kJ/ mole.
What is internal energy?Internal energy is defined as the quality or state function that describes a substance's energy in the absence of capillary effects and the impacts of external magnetic, electric, and other fields. Geothermal heat from the earth's core and high-temperature mantle is the main source of internal energy for the planet.
Given,
Δq = 7.070 kJ
P∆V = 1.414 kJ
As we know that
Δq = ΔU + P∆V
So, ΔU = Δq - P∆V
ΔU = 7.070 kJ - 1.414 kJ
ΔU = 5.656 kJ / mole
Thus, the change in internal energy for the system is 5.656 kJ/ mole.
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An aqueous solution of barium hydroxide is standardized by titration with a 0.170 M solution of nitric acid.
If 27.2 mL of base are required to neutralize 10.4 mL of the acid, what is the molarity of the barium hydroxide solution?
The molarity of the barium hydroxide solution is 0.065M.
How to calculate molarity?Molarity is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution.
The molarity of a substance can be calculated using the following formula:
CaVa = CbVb
Where;
Ca = initial concentrationCb = final concentrationVa = initial volumeVb = final volumeAccording to this question, an aqueous solution of barium hydroxide is standardized by titration with a 0.170 M solution of nitric acid. If 27.2 mL of base are required to neutralize 10.4 mL of the acid, the molarity of the barium hydroxide solution can be calculated as follows:
0.170 × 10.4 = Cb × 27.2
1.768 = 27.2Cb
Cb = 0.065M
Therefore, 0.065M is the molarity of the barium hydroxide solution.
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when a KR-89 captures an electron, what is the particle that is formed?
When a Kr-89 captures an electron, the particle that is formed is bromine with atomic number of 35.
What is radioactivity?Radioactivity is the spontaneous emission of ionizing radiation as a consequence of a nuclear reaction, or directly from the breakdown of an unstable nucleus.
The radiation emitted includes the following;
gamma raysalpha particlesneutronselectronspositronsAn electron is a negatively charged subatomic particle that can be either bound to an atom or free (not bound). It has a charge of -1.
According to this question, when a Kr-89 captures an electron, the particle formed can be deduced as follows:
89/36Kr + 0/-1e = 89/35Br
This suggests that the particle formed when a particle of krypton captures an electron is bromine.
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Why add ammonia to test solution when checking the percent copper in a penny
Answer: it erases the blue oxidized copper and returns it to its pristine original look
Explanation:
The more cooper there is the better the ammonia will work