Answer:
isotopes of elements with unstable nucleus releases nuclear radiation. generally the instability is related to the neutron to proton ratio in the nucleus of an atom
What is atomic radius and how is this value obtained
Answer:
Atomic radius is the radius of an atom. It can be attained through measuring the radius of an atom in a variety of bonds and averaging them to get it.
Explanation:
(b)Diborane, B₂H6, can be prepared by the following reaction:
NaBH4 (s) + BF3(g) B₂Hs(g) + NaBF4(s)
i. Balance the equation
ii. How many moles of NaBH, react with 1.299 mol of BF3?
iii.How many moles of B₂H, can be obtained from 0.893 mol of NaBH₂?
iv. If 1.987 mol of B₂H, is obtained, how many moles of NaBF, are produced?
[7 marks]
First we will balance the given equation:
NaBH4 (s) + BF3(g) B₂H6(g) + NaBF4(s)
The addition of stoichiometric coefficients to the reactants and products is necessary to balance chemical equations. This is significant because a chemical equation must adhere to the laws of conservation of mass and constant proportions, meaning that both the reactant and product sides of the equation must contain the same number of atoms of each element.Balanced equation:
3NaBH4 (s) + 4BF3(g) 2B₂H6(g) + 3NaBF4(s)
ii) 4 moles of BF3 reacts with 3 mole of NaBH4
1 mole of BF3 reacts with 3/4 = 0.75 mole of NaBH4
so the 1.299 moles of BF3 will react with 1.299× 0.75 = 0.974 moles of NaBH4
iii) 3 moles of NaBH4 gives 2 moles of B2H6
1 mole of NaBH4 gives 2/3 = 0.6 moles of B2H6
so, 0.893 mole of NaBH4 will give 0.893 × 0.6 = 0.535 molesof B2H6.
iv) 2 moles of B2H6 is produced with 3 moles of NaBF4
if 1 mole of B2H6 is produced then 3/2 = 1.5 moles of NaBF4 is produced with it.
so is 1.987 mol of B2H6 is obtained then 1.987 × 1.5 = 2.98 moles of NaBH4 will be obtained.
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the mass of a single tantalum atom is 3.01x10^-22 grams. how many tantalum atoms would there be in 119 milligrams of tantalum?
Answer:
7.51
×
10
24
The density
ρ
of a sample is its ratio of mass
m
to volume
V
:
ρ
=
m
V
.
To find the number of atoms in this sample, first multiply the volume by the density to get the mass. Then divide this mass by the mass of one atom.
133
c
m
3
T
a
(
17.0
g
1
c
m
3
)
(
1
atom
T
a
3.01
×
10
−
22
g
T
a
)
=
7.51
×
10
24
Ta atoms
Dr. R needs to make 153 mL of a 1.25 M solution of ZrCl2. What mass of ZrCl2 is needed to prepare this solution?
The mass of ZrCl₂ needed to prepare the solution, given the data is 30.98 g
How to determine the mole of ZrCl₂We'll begin by obtaining the mole of ZrCl₂. This can be obatined as follow:
Volume = 153 mL = 153 / 1000 = 0.153 LMolarity = 1.25 MMole of ZrCl₂ =?Mole = Molarity x Volume
Mole of ZrCl₂ = 1.25 × 0.153
Mole of ZrCl₂ = 0.191 mole
How to determine the mass of ZrCl₂ neededWe can obtain the mass of ZrCl₂ needed to prepare the solution as follo:
Molar mass of ZrCl₂ = 91.22 + (35.5 × 2) = 162.22 g/molMole of ZrCl₂ = 0.191 mole Mass of ZrCl₂ =?Mass = mole × molar mass
Mass of ZrCl₂ = 0.191 × 162.22
Mass of ZrCl₂ = 30.98 g
Thus, the mass of ZrCl₂ needed to prepare the solution is 30.98 g
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Calculate the moles of ammonia present in a 4.206 g sample of ammonia which has a molar mass of 17.30 g/mol
Answer:
The moles of ammonia present will be "0.274 moles".
Molar mass:
A particular element's molar mass would be the mass of either the material that contains 1 mole of material. It should be the weight of such mole of something in basic words.
To determine the molar mass, multiply the atomic mass per each substance by the component's subscript throughout the chemical equation.
Given:
Weight in grams, w = 4.652 g
Molar mass, m = 17.030 g/mol
We know,
→ Number \ of \ moles (n)= \frac{Weight(w)}{Molar \ mass(m)}Number of moles(n)=
Molar mass(m)
Weight(w)
By substituting the values,
n = \frac{4.652}{17.030}n=
17.030
4.652
= 0.274=0.274 moles
Thus the response above is right
Atoms of C-12, C-13, and C-14 have the
same number of protons but a different number of neutrons.
same number of neutrons but a different number of protons.
same number of electrons but a different number of protons.
same number of protons but a different number of electrons.
Answer:
same number of protons but different number of neutrons.
1.Differences between ions and charge??
A 25.0-g sample of pure iron at 85 °C is dropped into
75 g of water at 20. °C. What is the final temperature
of the water-iron mixture?
A sample of 25.0-g pure iron at the 85 °C is dropped into 75 g of water at 20°C. 22.25 °C is the final temperature of the water-iron mixture.
What is Specific Heat Equation ?The specific heat equation is represented as
Q = mcΔT
where,
Q = heat energy in Joules
m = mass of substance
c = specific heat
ΔT = change in temperature in K
For iron given that
m = 25 g
c = 0.45 J/g°C
T₁ = 85°C
Now by putting the values in the above formula then we get
Q₁ = mcΔT
= 25 × 0.45 × (T₂ - 85)
= 11.25 × (T₂ - 85)
For water given that
m = 75 g
c = 4.184 J/g°C
T₁ = 20°C
Now,
Q₂ = mcΔT
= 75 × 4.184 × (T₂ - 20)
= 313.8 × (T₂ - 20)
Now,
Heat is generated by the iron = Heat is gained by the water.
Q₁ = -Q₂
11.25 × (T₂ - 85) = - 313.8 × (T₂ - 20)
325.05 T₂ = 7232.25
T₂ = 22.25 °C
22.25 °C is the final temperature of the water-iron mixture.
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If 7.50 mol of NH₃ and 8.15 mol of O₂ react in the following reaction, how many moles of H₂O will be formed? 4 NH₃ (g) + 5 O₂ (g) → 4 NO (g) + 6 H₂O (g)
If 7.50 mol of NH₃ and 8.15 mol of O₂ react in the following reaction. The number of moles of H₂O that will be formed is 9.84 moles.
What are moles?The mole is a SI unit of measurement that is used to calculate the quantity of any substance.
Using the molar coefficients in the balanced equation, 6 moles of water are formed for every 4 moles of NH₃.
6 moles of water are formed for every 5 moles of O₂.
So (7.5 moles NH₃)(6 moles H₂O)/4 moles NH₃) = 11.25 moles water
For (8.20 moles O₂) / (6 moles H₂O)(5 moles O₂) = 9.84 moles H₂O.
So O₂ is the limiting reagent, and we can only make as much product as allowed by the limiting reagent.
Thus, the number of moles is 9.84 moles of water.
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How many electrons must each atom gain or lose to acquire an electron configuration identical to the noble gas nearest to it in atomic number?
Li lose one electron to acquire an electronic configuration. I must accept one electron, N accept three electron and Al lose three electron to acquire noble gas electronic configuration.
For Li,
Li belongs to first group of the periodic table and have 3 as atomic number. So, it lose one electron to acquire stable electronic configuration like as Helium.
For I,
I belongs to 17th group of the periodic table and have 53 as atomic number. So, it accept one electron to acquire stable electronic configuration like as Xenon.
For N,
N belongs to 15th group of the periodic table and have 7 as atomic number. So, it gain three electron to acquire stable electronic configuration like as Neon.
For Al,
Al belongs to 3rd group of the periodic table and have 13 as atomic number. So, it lose three electron to acquire stable electronic configuration like as Neon.
Thus, we concluded that Li lose one electron to acquire an electronic configuration. I must accept one electron, N accept three electron and Al lose three electron to acquire noble gas electronic configuration.
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Initially, 0.880 mol of A is present in a 3.00 L solution.
2A(aq)↽−−⇀2B(aq)+C(aq)
At equilibrium, 0.150 mol of C is present. Calculate K.
The equilibrium constant is 0.026.
What is the equilibrium constant of the reaction?Let us recall that the equilibrium constant is a number that shows us the extent to which reactants are converted into products. In other words, a large positive value of the equilibrium constant indicates that most of the reactants have been converted into products.
Initial concentration of A = 0.880 mol /3.00 L = 0.29 M
Equilibrium concentration of C = 0.150 mol /3.00 L = 0.05 M
We can set up the ICE table thus;
2A(aq) ⇄ 2B(aq) + C(aq)
I 0.29 M 0 0
C -2x +2x +x
E 0.29 - 2x 2x 0.05 M
Where
x = 0.05
At equilibrium;
[A] = 0.29 - 2(0.05 ) = 0.19 M
[B] = 2(0.05) = 0.1 M
[C] = 0.05 M
K = [B] [C] /[A]
K = 0.1 * 0.05/ 0.19
K = 0.026
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The first four ionization energies for element “X” (not in kJ/mol) are 170, 350, 1800, 2500. The first four ionization energies for element “Y” are 200, 400, 3500 and 5000. Identify elements “X” and “Y”. Explain your choice.
The elements involved could be ba--rium and strontium.
What is the ionization energy?We know that the ionization energy refers to the energy that must be supplied in order for an electron to leave the atom. The energy could bee supplied in the form of heat or light.
In the question, we have the first four ionization energies of the elements X and Y. The lower first and second ionization energies suggest that the electrons are removed from the outermost shells and that the two elements are divalent. That explains the quantum jump that occurs after the second ionization energy in each case.
The low first and second ionization energies implies that the elements are highly electropositive and are likely to be ba--rium and strontium.
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The densities of zinc, chromium and iron are 7.89, 7.20 and 7.86 g/cm³, respectively. A
metal with a volume of 12.3mL has a mass of 96.7g. What is this metal? Remember that
1 cm³ is the same as 1 ml
Taking into account the definition of density, the metal with a volume of 12.3 mL and a mass of 96.7 g is iron.
Definition of densityDensity is defined as the property of matter, whether solid, liquid, or gas, that allows the amount of mass in a given volume of a substance to be measured.
The expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
density= mass÷ volume
Density in this caseIn this case, you know that:
Mass= 96.7 gVolume= 12.3 mL= 12.3 cm³ (being 1 mL= 1 cm³)Replacing in the definition of density:
density= 96.7 g÷ 12.3 cm³
Solving:
density= 7.86 g/cm³
On the other hand, you know that the densities of zinc, chromium and iron are 7.89, 7.20 and 7.86 g/cm³, respectively.
Finally, the metal with a volume of 12.3 mL and a mass of 96.7 g is iron.
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Calculate the number of nitrogen atoms in a 80.0 g sample of dinitrogen tetroxide (N₂O4).
Be sure your answer has a unit symbol if necessary, and round it to 3 significant digits.
The number of atoms of nitrogen in an 80.0 g sample of dinitrogen tetroxide (N₂O4) is 1.047 * 10²⁴ atoms.
What is the number of nitrogen atoms in an 80.0 g sample of dinitrogen tetroxide (N₂O4)?The number of nitrogen atoms in an 80.0 g sample of dinitrogen tetroxide (N₂O4) is calculated as follows:
Molar mass of N₂O4 = 92 g/mol
Moles of N₂O4 in 80.0 g sample = 80/92
Moles of N₂O4 in 80.0 g sample =0.87 moles
Moles of nitrogen in the sample = 0.87 * 2
Moles of nitrogen in the sample = 1.74 moles
1 mole of nitrogen contains 6.0 * 10²³ atoms
Number of atoms of nitrogen = 1.74 * 6.0 * 10²³ atoms
Number of atoms of nitrogen = 1.047 * 10²⁴ atoms
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What is the chemical formula for the compound formed between cobalt (iii) and borate ion?
Answer:
Cobalt(III) Borate CoBO3 Molecular Weight -- EndMemo.
Explanation:
A + B <-------> AB is an example of what type of chemical reaction
Answer:
Synthesis reaction
Explanation:
In synthesis reactions, two or more atoms/molecules combine to form a larger molecule.
These reactions follow the general structure: A + B <-----> AB.
What is the correct IUPAC name for 3,3,4-Trimethylpentane
describe the features of organic compounds
Answer:
Organic compound features:
Explanation:
Complex structures
High molecular weights
Depend on Carbon, Hydrogen and Water
Combustile in nature
Form covalent bonds
Low melting and boiling points
Scrub all right, had to drink a poisonous substances that paralyzes body resulting in death what is most likely the exclamation for how the substance produced paralysis
The body's muscles become increasingly paralyzed as a result of tetrodotoxin's interference with the signaling process from nerves to muscles. Toxic exposure to tetrodotoxin may be lethal.
Scrub all right, had to drink a poisonous substances that paralyzes body resulting in death.
What is most likely the exclamation for how the substance produced paralysis?
Tetrodotoxin (TTX), a neurotoxin, is extremely poisonous.
Tetrodotoxin is a sodium channel blocker. It stops neurons from firing action potentials by clinging to the voltage-gated sodium channels in nerve cell membranes and obstructing sodium ions from entering the neuron, which are crucial for an action potential's rising phase.
Due to the neurological system's inability to communicate, muscles are unable to contract in response to nerve inputs. It works by selectively blocking sodium channels.
The majority of its occurrences are in the livers and sex organs of several fish species, such as puffer fish, globefish, and toadfish (order Tetraodontiformes) (gonads).
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Common table salt is 39.3 % sodium by mass. What mass of table salt
provides the upper safe limit in the recommended daily requirement of sodium
which is 2300. mg?
5.845 mg of table salt provides the upper safe limit in the recommended daily requirement of sodium.
How to calculate mass percent of sodium?Molar mass of common table salt that is sodium chloride is 23.0+35.5=58.5 g/mole which is the addition of molar masses of sodium and chlorine,the constituents of sodium chloride.
As the common table salt is 39.3% sodium by mass therefore it has 23.01975 g or 23019.75 mg of sodium.
39.3/100×58.5=23019.75
As 58.5 g of sodium chloride has 23.019 g of sodium therefore 2.3 g of sodium is present in 5.845 g, which is 5.845×10[tex]^-3[/tex]mg.
2.3×58.5/23.019=5.845 mg.
Mass percent of any compound is usually calculated as mass of the compound divided by it's total mass and then multiplied by hundred.It is a way of expressing concentration of a component.It describes how much solute is present in 100 grams of solution.
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Explain how fomation of lines indicate the presence of energy level
Name 3 sources for ions in seawater
Write a net ionic equation for the reaction that occurs when aqueous solutions of potassium hydroxide and perchloric acid are combined
The net ionic equation of potassium hydroxide and perchloric acid combined in aqueous solutions is
H⁺ + OH⁺ → H₂O
How to write a net ionic equation?Step 1: Complete the equation, write the correct chemical formula for each compound both in reactant and product
Step 2: Separate the compounds in ionic form.
Step 3: Stike out the common element in the product and the reactant side.
Demonstration: KOH (aq) + HCLO₄ (aq) → KCLO₄(aq) + H₂O(lq)
Total ionic equation: K⁺ + OH⁻ + H⁺ + CLO₄ → K⁺ + CLO₄ + H₂O
Net ionic equation: H⁺ + OH⁻ → H₂O
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The facts you find in reference source that support your data in an experiment
The facts you find in reference source that support your data in an experiment is known to be called research.
What is known to be a research?Research is known to be a term that is defined as as a kind of "creative and methodical form of activity done to improve the body of knowledge.
It entails the objective gathering, organizing, and analysis of data in order to improve comprehension of a subject or issue.
The Research is described as the thoughtful analysis of studies pertaining to a certain issue or problem utilizing scientific methodologies.
Therefore, since Research is a methodical inquiry, one can say that he facts that you find in reference source that support your data in an experiment is known to be called research.
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need help on chemistry homework
Use the density of palladium (d = 12.1 g/cm3) to determine the volume in cubic centimeters of a sample that has a mass of 44.1 ounces.
(1 ounce = 28.35 grams)
The volume of the palladium is 103.3 cubic centimeters.
What is the density?The term density has to do with the ratio of the mass to the volume of a substance. We can see here that the density of the palladium has been given as 12.1 g/cm3. However, the mass of the substance has been given in ounces.
We know that;
1 ounce = 28.35 grams
44.1 ounces = 44.1 ounces * 28.35 grams/1 ounce
= 1250.23 g
Density = mass/volume
volume = mass/Density
volume = 1250.23 g/12.1 g/cm3
volume = 103.3 cubic centimeters
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Explain how the interdependent relationship between advances in technology and scientific discoveries has enhanced
our understanding of the universe.
The interdependent relationship between advances in technology and scientific discoveries has enhanced our understanding of the universe. schooling, merchandising, and different multidisciplinary efforts by way of fostering higher information about the multidimensional nature of research.
Development in technological know-how and technology studies seeks to improve the techniques of technology and technology studies, Clinical expertise is used to create new technologies. New technology regularly allows scientists to explore nature in distinct ways and make new discoveries.
Technological know-how is the have a look at the natural world through a scientific approach i.e. collecting facts via a systematic procedure. And era is in which we observe science to create gadgets that can solve issues and perform distinct responsibilities. technology is literally the utility of science.
Society drives technological improvements and scientific inquiry. technology offers us a perception of what form of technology we should doubtlessly create and a way to create them, even as technology allows us to behave in addition to medical studies.
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express the number 0.000114 in scientific notation.
its correct
The correct symbol for Cl with 20 neutrons and 14 electrons is
Select one:
a. 1735 CI+
b.1735 Cl
C. 1737C15+
d. 1735Cl
e. 1737 C1³+
E. The oxidation number of chlorine with 14 electron is written as 17, 37 CL⁺³.
What is oxidation number?Oxidation number of an atom/ion is the number of electrons an atom/ion that the molecule has either gained or lost compared to the neutral atom.
What is oxidation number of chlorine?Chlorine is a non metal with atomic number of 17 (17 electron, and 17 proton).
Chlorine also has an oxidation number of -1.
When the number of electron of the chlorine has been reduced to 14, it implies that the chlorine ion has been reduced by losing 3 electrons.
The oxidation number of chlorine with 14 electron is written as follows;
= CL (14) = 17 CL⁺³
mass number = 17 + 20 = 37
= 17, 37 CL⁺³
Thus, the oxidation number of chlorine with 14 electron is written as 17, 37 CL⁺³.
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could chuck could chuck wood chuck?
What is the relationship between KMT and Sea Level Rise?
CER format
3-4 sentences
Sea level may rise as a result of the expansion of seawater and the melting of land-based ice due to a warming environment.
What is the sea level?The sea level is the fundamental level for calculating height and depth on Earth. Since the ocean is one continuous body of water, its surface tends to seek a constant level. The sea surface is not actually level due to winds, currents, river discharges, fluctuations in gravity, and temperature.
Why is sea level important?People are impacted by sea level changes through flooding, the inability of rivers to empty into the ocean due to the sea being too high, and the surge of seawater onto the land during storms. Our drinking water and the ability to cultivate crops could be harmed if sea water gets into farms and reservoirs.
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