Answer:
Incomplete question. You didn't give the volume of HNO3
A radioactive nuclide is used to detect eye tumors. An atom of this radionuclide contains 15 protons, 15 electrons, and
17 neutrons. Which is symbol of this radionuclide?
Answer: ³²P
Explanation:
The radionuclide in question is known as Phosphorus-32. It is an isotope of Phosphorus that is radioactive and has one more neutron than the normal phosphorus does.
Phosphorus does not exist in nature and is created artificially by bombarding the normal stable phosphorus with neutrons. Due to its radioactive nature, it has proven to be useful in the medical industry where it has been used to detect eye tumors as well as in treating some diseases.
A voltaic cell consists of an Mn/Mn2 half-cell and a Pb/Pb2 half-cell. Calculate [Pb2 ] when [Mn2 ] is 1.1 M and E cell is 0.44 V.
Answer:
[Pb²⁺] = 2.31x10⁻²¹ M
Explanation:
Let's write the semi reaction for each half cell:
Pb²⁺ + 2e⁻ -----------> Pb(s) E° = -0.13 V
Mn²⁺ + 2e⁻ ----------> Mn(s) E° = -1.18 V
As we can see, the E° of Pb is higher than the E° of the Mn, thus, Pb is reducting and Mn is oxidizing:
Pb²⁺ + 2e⁻ -----------> Pb(s) E°₁ = -0.13 V
Mn(s) ---------> Mn²⁺ + 2e⁻ E°₂ = +1.18 V
E° = E°₁ + E°₂
E° = -0.13 + 1.18 = 1.05 V
Now, we can use the Nerst equation which is:
E = E° - 0.059/n log([Mn²⁺] / [[Pb²⁺])
From here, we just need to replace and then, solve for the [Pb²⁺]:
0.44 = 1.05 - 0.059/2 log(1.1 / x)
0.44 - 1.05 = -0.0295 log(1.1 / x)
-0.61 / -0.0295 = log(1.1 / x)
antlog(20.678) = 1.1 /x
x = [Pb²⁺] = 1.1 / 4.76x10²⁰
[Pb²⁺] = 2.31x10⁻²¹ MHope this helps
How many atoms of carbon are in 79.7 moles of carbon?
Answer:
[tex]4.8 x 10^{25\\}[/tex] atoms
Explanation:
Use the avogadro number
79.7 moles C x [tex]\frac{6.022 x 10^{23} }{ 1 mole C}[/tex] = [tex]4.8 x 10^{25\\}[/tex] atoms
Molecular distances are given in picometers, where 1 pm is equivalent to 1 x 10-12 meter.If the distance between carbon atoms in a diamond is 1.54 x 10-8 cm, what is this distance in picometers
Answer:
Distance = 154 pm
Explanation:
Given that,
The distance between carbon atoms in diamond is [tex]1.54\times 10^{-8}\ cm[/tex]
We need to find the distance in pm.
We know that,
[tex]1\ pm=10^{-12}\ m[/tex]
[tex]1.54\times 10^{-8}\ cm=1.54\times 10^{-8}\times 10^{-2}\ m\\\\=1.54\times 10^{-10}\ m[/tex]
Multiplying and dividing by 10⁻².
[tex]d=1.54\times 10^{-10}\times \dfrac{10^{-2}}{10^{-2}}\\\\=154\times 10^{-12}\ m\\\\=154\ pm[/tex]
So, the distance is 154 pm.
A student is creating a model of space and wants to include the Earth, the Milky Way galaxy, the universe, and the
solar system. How should the student scale the components of the model to make an accurate model? Select the
FOUR statements that apply.
A)
The universe should be the largest component of the model.
B)
The Earth should be a smaller component within the solar system.
C)
The solar system should be scaled smaller than the Milky Way galaxy.
D)
The solar system should be larger than the Earth but not larger than the
Milky Way
E)
The Milky Way should be larger than the Earth but smaller than the solar
system.
Answer:
the solar system should be larger than earth but not larger than the milky way
The universe is made of billions of galaxies, stars, planets, satellites of these planets dark matter and other small objects. Universe being the largest in the model and then milky galaxy in which the solar system is one component and the smallest in the model is earth.
What is galaxy?Galaxy is a group of stars, dust and dark matter connected with a gravitation pull. The Universe is made of billions of galaxies in which the one which is near to the earth is called milky-way.
There are number of planets in the universe and some of them are not identified yet. The solar system is a group of planets which revolving around the sun.
Earth is one planet in the solar system. Galaxies are bigger than solar system. Thus in the model earth being the smaller component and solar system smaller than milky way.
Universe be the largest in this model containing all these galaxies, solar system and planets. Hence the options A, B,C and D are correct.
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Fill in the blank: The bonds in an ionic compound________
electrons.
Answer:
Ionic bonding is the complete transfer of valence electron
Explanation:
In ionic bonds, the metal loses electrons to become a positively charged cation, whereas the nonmetal accepts those electrons to become a negatively charged anion.
PLZ HELP ASAP!!!
What is the percent by mass of CaCl2, when 35 grams are dissolved in enough water to produce 3 kg of solution?
A) 12%
B) 8.6%
C) 86%
D) 1.2%
Answer:
A) 1.2%
Explanation:
ou discover that the complex decomposes in water. When 0.1000 g of the complex is dissolved in water with excess NaHg(SCN)4, all of the Co(II) is precipitated as CoHg(SCN)4 (s). After the precipitate is washed and dried, its mass is found to be 0.1102 g. How many grams of cobalt are contained in the original 0.1000 grams of the complex
Answer:
6.28x10⁻³ g
Explanation:
First we convert 0.1102 grams of CoHg(SCN)₄ into moles, using its molar mass:
0.1102 g ÷ 491.9 g/mol = 2.24x10⁻⁴ mol CoHg(SCN)₄There is 1 Co mol per CoHg(SCN)₄ mol, meaning there's also 2.24x10⁻⁴ moles of Co.
We now convert 2.24x10⁻⁴ moles of Co into grams, using its molar mass:
2.24x10⁻⁴ mol Co * 28.01 g/mol = 6.28x10⁻³ gstructural formula for alkene with double bond st carbon 2 that shows no trans -cis isomerism C6H12
Answer:
Explanation:
Read up on this:
https://chem.libretexts.org/Bookshelves/Introductory_Chemistry/Book%3A_The_Basics_of_GOB_Chemistry_(Ball_et_al.)/13%3A_Unsaturated_and_Aromatic_Hydrocarbons/13.02%3A_Cis-Trans_Isomers_(Geometric_Isomers)
I think the answer is going to structure of 2-methyl-2-pentene.
The density of a 25.0% HCl solution (by mass) is 1.05 g/mL, what is the molality of the solution?
(MW HCI: 36.46g/mol, H2O: 18.015g/mol)
a. 9.60 m
b. 6.86 m
c. 7.20 m
d. 9.14 m
e. None of the above
Answer:
[HCl] = 14.7M in HCl
Explanation:
Definition of Molarity (M) = moles solute / Liters of Solution
Given 25.0% HCl (aq) => 25g HCl/100g Solution => ? moles HCl/Liter Solution
Convert 25g HCl to moles = moles solute
moles HCl => moles HCl = 25g HCl / 18.015g HCl/mole HCl = 1.387732 mole HCl = 1.4 moles HCl (2sig.figs.)
Determine Liters of Solution as follows:
Given 25% HCl Solution => 25g HCl/100 g Solution
100 g Solution = (100 g solution) / (1.05 g Solution/ml Solution )
= 95.2381 ml Solution x 1 Liter Solution/1000 ml Solution
= 0.0952 Liters Solution
Apply above mole and volume data to definition of mole.
∴Molarity = moles solute / Liters solution
= 1.4 moles solute (HCl)/0.0952 L solution
= 14.7 Molar in HCl(aq)
A mixture of 14.0 grams of H2, 84.0 grams of N2, and 64.0 grams of O2 are placed in a flask. The partial pressure of the O2 is 78.00 torr. What is the total pressure in the flask
Answer:
[tex]P_{tot}=465.27torr[/tex]
Explanation:
Hello there!
In this case, according to the given information, it will be possible for us to use the Dalton's law, in order to solve this problem. However, we first need to calculate the mole fraction of oxygen by firstly calculating the moles of each gas:
[tex]n_{H_2}=\frac{14.0g}{2.02g/mol} =6.93mol\\\\n_{N_2}=\frac{84.0g}{28.02g/mol}=3.00mol\\\\n_{O_2}=\frac{64.0}{16.00g/mol} =2.00mol[/tex]
Next, we calculate such mole fraction as follows:
[tex]x_{O_2}=\frac{2}{6.93+3+2} =0.168[/tex]
Then, given the following equation:
[tex]P_{O_2}=P_{tot}*x_{O_2}[/tex]
So we solve for the total pressure as follows:
[tex]P_{tot}=\frac{P_{O_2}}{x_{O_2}} \\\\P_{tot}=\frac{78.00torr}{0.168} \\\\P_{tot}=465.27torr[/tex]
Regards!
Hello I need help please
Answer:
The concentration of an acid in a solution can be determined by making an acid-base titration. To do this, a known volume of the acid solution is gradually added alkali solution whose concentration is known, until a neutral pH is reached.
Explanation:
Today, nuclear power plants rely on fission. While fusion reactions have been used in nuclear bombs, many scientists and engineers hope that in the future we can use fusion to produce energy. What are some possible advantages of fusion energy over fission energy?
Explanation:
nuclear fusion yields more energy than nuclear fission and the products of the reaction are not radioactive
When the two nuclei merge to form a single nucleus is called fusion and the splitting of the nucleus to form two nuclei is called fission. Fusion can create more energy.
What is the difference between Nuclear fusion and fission?Nuclear fusion and fission are the nuclear reactions that yield energy as the end product. They are different as fusion is the combination of two nuclei and fission is the splitting of the two nuclei.
Fission involves the decay of radioactive substances and formation of the energy. It is used for the formation of nuclear power plants and fusion is involved in the production of the bombs.
Fusion is the more powerful reaction that occurs in the sun and can yield more energy as compared to fission reactions. It is more advantageous as the radioactive substances are not formed at the end of the reaction.
Therefore, fusion is more powerful than fission.
Learn more about fusion and fission here:
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A chemistry student needs 90.00 g of thiophene for an experiment. She has available 0.50 kg of a 12.3% w/w solution of thiophene in ethanol.
Calculate the mass of solution the student should use. If there's not enough solution, press the 'No solution" button
Round your answer to 3 significant digits. Put the answer in terms of the amount of grams.
Answer: The correct answer is No solution.
Explanation:
We are given:
Given mass of thiophene for the experiment = 90.00 g
12.3% w/w solution of thiophene
This means that 12.3 g of thiophene is present in 100 g of solution
Applying unitary method:
If 12.3 g of thiophene is present in 100 g of solution
So, 90.00 g of thiophene will be present in [tex]\frac{100g}{12.3g}\times 90.00g=731.7g [/tex] of solution
Converting it into kilograms:
1 kg = 1000 g
So, 731.7 g = 0.7317 kg
As the given amount of solution is 0.50 kg which is less than the required amount.
Thus, there is not enough solution the student should use.
Matter is never created or destroyed.
Lesson 5.04
Question 7 options:
True
False
Climate change as we know it today is
characterized by a(n) __change in the
earth's temperature.
slow
abrupt (sudden)
rough
Please help and explain how to do it need the answer asap, please.
Answer:
45 and 20 c2 Or4
Explanation:
an erlenmeyer flask contains 15.00mL of 0.030 M HCI before titration. 5.00 mL of 0.050 of M NaOH is added to the HCI in the flask during titration. What is the mole ratio of acid (HCI) to base (NaOH) in the balanced neutralization equation?
0.05 to 0.03
1:1
1:2
which expression. gives the actual moles of base added?
0.050x5.00
0.030x0.015
0.050x0.005
How many moles of H+ will be present following neautralization?
0.25
0.00025
0.025
Answer:
1.1
0.050*0.005
0.00025
Explanation:
What is the pH when the hydrogen ion concentration is 1 x 10-3 M?
O a. 3.3
O b. 4
O c. 2.7
O d. 2
O e. 3
Answer:
e. 3
Explanation:
In order to solve this problem we need to keep in mind the definition of pH:
pH = -log[H⁺]As stated by the problem, the hydrogen ion concentration, [H⁺], is 1x10⁻³ M.
As all required information is available, we now can calculate the pH:
pH = -log(1x10⁻³ M)pH = 3The correct option is thus e.
2 HCl + Na2SO4 > 2 NaCl + H2SO4
If you start with 20 grams of hydrochloric acid, how many grams of sulfuric acid will be produced?
Answer:
15
Explanation:
Chemical Reactions:Question 3
The graph shows the energy change that occurs during a chemical reaction.
Graph 1
Energy
Reaction Progress
What conclusion can be reached based upon the graph?
Select one
The energy of the reactants is less than the energy of the products,
The energy of the products and the energy of the reactants are equal.
The energy of the products is less than the energy of the reactants
Energy was neither absorbed not released during this reaction
Answer:
because of how big it is
Explanation:
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The graphs shows the energy change of an exothermic reaction. Hence, the energy of products is less than the energy of reactants. Thus, option c is correct.
What is an exothermic reaction?The reaction in which heat energy is evolved to the surroundings is called an exothermic reaction. The reaction where, the heat energy is absorbed by the system is called endothermic reaction.
An energy diagram is used to describe the energy change in a reaction and the energy difference between reactants and products. In an endothermic reaction, the reactants are absorbing sufficient energy and thus easily overcome the barrier potential.
In exothermic reactions, products are absorbing energy and overcome the barrier potential. Therefore, in exothermic reactions, the potential energy of products is less than that of reactants as shown in the diagram.
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it refers to the length of the entire path the object travelled
Answer:
Path length is the overall distance traveled following the path of where the object travel. ... Displacement is the distance from the starting point of the object to its final point irregardless where it travels.
The diameter of a circle is 17 cm. Find its circumference in terms of \piπ.
Answer: sorry I didnt know the answer it wont let me get off
Explanation:
How many formula units are there in 14.50 moles of Ba(NO2)2?
Answer:
I am pretty sure that there is 3325.401 formula units. I might be wrong. Hope this helps!
Explanation:
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Explanation:
Simply multiply the # of moles of O2 by a molar ratio to give the # of moles of MgO:
#moles O2 × (2 mol MgO/1 mol O2) = # moles of MgO
where the quantity inside the parenthesis is the molar ratio between MgO and O2.
What are the characteristics of acids and bases, and some examples of each? (20%)
Answer:
Acid :
1) they are sour in taste
2) if we put litmus paper in an acid they turn blue litmus to red and ( red litmus paper colour doesn't change )
3) acids use to react with metals
4) it releases hydrogen (H+) when dissolved in water
5) example : Hydrochloric acid , sulphuric acid , nitric acid etc..
base :
1) they are bitter in taste
2) and the red litmus paper trunes to blue and ( red litmus paper colour doesn't change )
3) it doesn't react with metals
4) it releases hydroxide (OH+) when dissolved in water
5 example : sodium hydroxide, potassium hydroxide etc...
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Answer:
hkdhmfewavs,nxzjrgjngrnjm
Explanation:
Answer:h hed chd dechgde chsxqwertyuioplkjhgfdsaazxcvbnm
Explanation:
Which type of fuel uses combustion to produce energy?
O A. Hydroelectric
B. Nuclear
O C. Biomass
D. Geothermal
Answer:
nuclear im not sure but the chances of the answer getting correct is high
For the following electrochemical cell, determine the oxidizing agent, reducing agent, and whether the cell is a voltaic cell or electrolytic cell.
Fe(s) / Fe2 (aq) (1.0 M) // Ni2 (aq) / Ni(s).
a. NiB.
b. Ni2+
c. Fe
d. Fe2+
e. voltaic
f. electrolytic
If 45.6 g of Fe2O3 reacts with excess water, how much heat is required?
Explanation:
I
have not yet learnt chemistry so sorry
Answer:
350
Explanation: