Answer:
210 82Pb-----> 206 80Hg + 4 2 He
55 24 Cr----->55 25 Mn + 0 -1 e
76 35 Br + 0 -1 e-----> 76 34 Se
Explanation:
Alpha decay occurs with atoms having high atomic number number. As the atomic number increases, the repulsions between the protons make the nucleus unstable. A point is reached where the attractive forces in the nucleus are unable to hold the nucleons together anymore. Part of the nucleus now breaks off as an alpha particle or a helium nucleus.
Beta decay involves the transformation of a neutron to a proton, electron and neutrino. It decreases the neutron-proton ratio.
The capture of an orbital electron converts a proton into a neutron with the emission of a neutrino. The atomic number of the product nucleus decreases. Orbital electron capture increases the neutron-proton ratio.
PLZ HELP For the reaction: 2NO2(g) → N2O4(l),
the ΔH of the reactants, two moles of NO2 (g), is + 66 kJ/mol,
and the ΔH of the products, N2O4 (l), is -20 kJ/mol.
Which of the following shows the ΔH (change in enthalpy) for the reaction as a whole?
Question 8 options:
ΔrxnH =(- 20 kJ/mol) / (+66 kJ/mol)
ΔrxnH = (+66 kJ/mol) + (- 20 kJ/mol)
ΔrxnH =(-20 kJ/mol) - (+ 66 kJ/mol)
ΔrxnH =(+66 kJ/mol) - (- 20 kJ/mol)
Answer: [tex]\Delta H_{rxn}=-20kJ/mol-(+66kJ/mol)[/tex]
Explanation:
Heat of reaction or enthalpy change is the energy released or absorbed during the course of the reaction.
It is calculated by subtracting the enthalpy of reactants from the enthalpy of products.
[tex]\Delta H=H_{products}-H_{reactants}[/tex]
[tex]\Delta H[/tex] = enthalpy change = ?
[tex]H_{products}[/tex] = enthalpy of products
[tex]H_{reactants}[/tex] = enthalpy of reactants
For the given reaction :
[tex]2NO_2(g)\rightarrow N_2O_4(l)[/tex]
[tex]\Delta H=H_{N_2O_4}-2\times H_{NO_2}[/tex]
[tex]\Delta H=-20kJ/mol-(+66kJ/mol)[/tex]
Why would an unstable radioactive isotope (nuclide) emit a beta particle (high energy electron)?
A)It has too many neutrons
B)It has too many protons
C)It has too many electrons
D)It has too few electrons
Answer:
A)It has too many neutrons
Explanation:
Electrons are emitted from the nucleus when a neutron is converted to a proton, an electron and a neutrino. This process is popularly known as beta emission. It reduces the neutron-proton ratio of a nuclide. The neutrino is a particle of zero mass and zero charge that carries off the excess energy and balances spins.
The loss of an electron from the nucleus occurs when there are too many neutrons in the nucleus. The process of beta emission usually reduces the number of neutrons in an atom thereby decreasing the neutron-proton ratio.
What is the molar mass of Ca(OH)2?
a
b
57.008 g/mol
74.092 g/mol
73.080 g/mol
73.088 g/mol
Ос
d
Answer: the molar mass is 74.092 g/mol
Explanation:
Which of the following samples contains the greatest number of atoms?
a. 9 mole of CO2 b. 10 moles of Xe
c. 11 moles of N2O d. 12 moles of CO
Answer:
C. 11 moles of N2O
Explanation:
A. CO2 exists as a molecular compound. The number of atoms present = 1 atom of Carbon and 2 atoms oxygen = 3 atoms * 9 = 18 atoms
B. Xe exists as an atom. Number of atoms present = 10 * 1 atom = 10 atoms
C. N20 contains 3 atoms; 2 atoms of Nitrogen and 1 atom of oxygen.
Number of atoms present = 3 * 11 = 33 atoms
D. CO contains 2 atoms, 1 each of carbon and oxygen.
Number of atoms present = 12 * 2 = 24 atoms
What is the name of this molecule?
Answer:
Pentane
Explanation:
Answer:
Hexane
Explanation:
alkane
single bonds and saturated hydrocarbon
the formula is C6H14
Which topic is commonly used to explain activation energy and how chemical reactions happen? reaction rate collision theory velocity distribution spontaneous reaction
Collision theory
B. in edge
When a cube of manganese oxide was added to a solution of hydrogen peroxide, water and oxygen were produced. Manganese oxide
was not used up in the reaction. Which of the following is likely to decrease the rate of the reaction?
Using a larger amount of solution
O Increasing the mass of the cube
O Chilling the hydrogen peroxide solution
O Smashing the cube into pieces
Answer: chilling the hydrogen peroxide solution
This will Decrease the rate of reaction
Chilling of hydrogen peroxide solution will cause a decrease in the rate of the reaction. The correct option is C.
What is rate of reaction?The reaction rate or in some other words the rate of reaction is actually the rate at which a chemical reaction takes place.
It is usually classified as proportional to the alter in product concentration per unit time and the decrease in concentration of reactant per unit time. The rates of reaction of different chemical reactions can vary.
The reaction rate is determined by the amount of the reactants, the temperature, and the catalyst.
As in the given reaction, the cube of manganese oxide was added to a solution of hydrogen peroxide, water and oxygen were produced. Manganese oxide was not used up in the reaction.
By chilling the hydrogen peroxide, the reaction will get altered as the temperature will not be appropriate for the reaction.
Thus, the correct option is C.
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balance
KClO3 ⟶ KCl + O2
Answer:
[tex]2KCl O_3 \to 2KCl + 3O_2[/tex]
Explanation:
Balance both sides.
Insulin is a protein that is used by the body to regulate both carbohydrate and fat metabolism. A bottle contains 225 mL of insulin at a concentration of 30.0 mg/mL . What is the total mass of insulin in the bottle?
Answer:
13,000 mg
Explanation:
40mg for every mL so you take 40x325 to wind up with 13,000mg of insulin or 13 grams.
Quickly Please!!!!!!
1. How many moles of a gas are contained in a 101 liter flask at a pressure of 2.0 atm and a temperature of 600K? (R = 0.0821)
G
U
E
S
S
Answer:
[tex]n=4.1mol[/tex]
Explanation:
Hello,
In this case, we can use the ideal gas equation:
[tex]PV=nRT[/tex]
So we know the temperature, pressure and volume, therefore we can easily compute the required moles as shown below:
[tex]n=\frac{PV}{RT}=\frac{2.0atm*101L}{0.082\frac{atm*L}{mol*K}*600K} \\\\n=4.1mol[/tex]
Best regards.
Answer:
4.1 moles
Explanation:
The following data were obtained from the question.
Number of mole (n) =..?
Volume (V) = 101L
Pressure (P) = 2atm
Temperature (T) = 600K
Gas constant (R) = 0.0821atm.L/Kmol
The number of mole of the gas can be obtained by using the ideal gas equation as illustrated below:
PV = nRT
2 x 101 = n x 0.0821 x 600
Divide both side by 0.0821 x 600
n = (2x 101) / (0.0821 x 600)
n = 4.1 moles.
Therefore, the number of mole of the gas in the container is 4.1 moles
Round to 4 significant figures.
35.5450
Answer:
35.5450 will be rounded to 35.55
Explanation:
=35.5450
if the last digit is less than 5 then it will be ignored
=35.545
when the dropping digit is 5 then the retaining digit will increse by a factor of 1
=35.55
i hope this will help you
Answer:
35.5450 to 4 significant figures is 35.55
Hope this helps.
Kostya randomly chooses a number from 1 to 10. What is the probability he chooses a number less than 5?
A. 1/2
B. 4/9
C. 2/5
D. 3/5
When writing the shorthand notation for sulfur, S, which element would you put in brackets?
HELP HELP HELP HELP HELP HELP!!!!!!
Barry is 62 years old. He runs every single day. His BMI is 15. He would like to gain weight, and increase muscle in his upper body, chest, and back.
what exercise should he do?
Answer:
He should eat fruits and vegetables and also skip
Molly just started a new job. She needs to fill out a _____ so that her employer knows how much tax to take out. 1099 form tax return form W-4 form W-2 form
Answer:
The answer is "W-4 form".
Explanation:
The W-4 form is part of the Internal Revenue Service tax form, which is used to submitted by the U.S. government form the customer to information and his or her tax situation. This form informs the customer of the right amount of tax to deduct from his or her salary.
That's why she filled out a W-4 form and know-how often tax he will subtract in the payroll depending on provisions dealing, dependents, potential tax deductions, and credits, etc.
3. The volume of a gas is reduced from 4 L to 0.5 L while the temperature is held
constant. How does the gas pressure change?
Answer:
The new pressure is 8 times the original pressure.
Explanation:
Data obtained from the question include:
Initial volume (V1) = 4L
Final volume (V2) = 0.5L
Initial pressure (P1) = P
Final pressure (P2) =..?
The new pressure can be obtained by using the Boyle's law as shown below:
P1V1 = P2V2
P x 4 = P2 x 0.5
Divide both side by 0.5
P2 = P x 4 / 0.5
P2 = 8P
Therefore, the new pressure is 8 times the original pressure.
ASAP PLEASE !!
What are some factors that causes the actual reaction enthalpy to vary from the accepted reaction enthalpy?
Answer:
Well, Here's some factors:
The concentrations of the reactants and the products.
The temperature of the system.
And, The partial pressures of the gases involved.
Good Luck!~
Which type of fuel can only be used in certain geographic area? A. natural gas B. nuclear C. solar D. Biomass
Answer:
Solar
Explanation:
Ap e x
The type of fuel which can only be used in certain geographic area is nuclear fuel.
What is fuel?The substance which on reacting with other materials will produces energy in the form of thermal energy and heat will be known as fuels.
• Natural gas, solar energy and biogas fuel provides acceptable amount of energy which never causes harm to the environment then they all will be used in all areas.
• Nuclear fuels produces a tremendous amount of energy which has an ability to destroy many lives and environment, so it would be used only is those geographical area where no lives are living.
Hence, nuclear fuel can only be used in certain geographic area.
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The following reaction is at equilibrium. What would be the effect of adding an excess of N2 and O2?
N2 + O2 ↔ 2NO
Question 16 options:
The equilibrium will shift to the right.
The equilibrium will shift to the left.
Less product will be produced.
Twice the product will be produced.
Answer:
B
Explanation:
Balance this equation. If a coefficient of "1" is required, choose "blank" for that box.
____ CH 4 + ___ O 2 → ____ CO 2 + ____ H 2 O
Answer:
CH4 + 2O2 → CO2 + 2H2O
Explanation:
CH4 + O2 → CO2 + H2O
Left Side
C = 1
H = 4
O = 2
Right Side
C = 1
H = 2
O = 3
Ok so we'll balance the H first
CH4 + O2 → CO2 + 2H2O
Left Side
C = 1
H = 4
O = 2
Right Side
C = 1
H = 4
O = 4
Now we'll balance the O
CH4 + 2O2 → CO2 + 2H2O
Left Side
C = 1
H = 4
O = 4
Right Side
C = 1
H = 4
O = 4
Ethanol, C2H5OH, is considered clean fuel because it burns in oxygen to produce carbon dioxide and water with few trace pollutants. If 325.0 g of H2O are produced during the combustion of ethanol, how many grams of ethanol were present at the beginning of the reaction?
Answer:
277.8 grams of ethanol
Explanation:
C2H5OH(l)+3O2(g)⟶2CO2(g)+3H2O(l)
It is important to understand that before we can proceed with solving any problem that has to do with stoichiometry, we must first note down the correct and balanced chemical reaction equation.
Number of moles of water formed= mass of water/ molar mass of water
Molar mass of water = 18gmol-1
Number of moles of water = 325g/18 gmol-1= 18.1 moles of water
From the balanced reaction equation;
1 mole of ethanol yields 3 moles of water
x moles of ethanol yields 18.1 moles of water
Hence;
x= 18.1 × 1 / 3 = 6.03 moles of ethanol
Molar mass of ethanol= 46.07 g/mol
Therefore mass of ethanol originally present= 6.03 moles × 46.07 g/mol = 277.8 grams of ethanol
4HCl(g) + Si (s) ⇌ SiCl4 (l) + 2H2 (g) would be classified as a(n):
Answer:
it will be classical as gas
state symbol for ammonium nitrate solution (Can anyone help with this please?)
Answer:
NH^4NO^3
Explanation:
Ammonium nitrate, (NH4NO3), a salt of ammonia and nitric acid, used widely in fertilizers and explosives.
Select the word or phrase from the drop-down menu to describe ionic compounds. A formula unit represents the simplest ratio of elements in a of an ionic compound. A crystal is made up of There are two magnesium ions for every two sulfide ions in magnesium sulfide. The ratio of Mg to S in the formula unit is .
Answer:
A formula unit represents the simplest ratio of elements in a
✔ crystal
of an ionic compound.
A crystal is made up of
✔ many atoms that are arranged in a regular pattern.
There are two magnesium ions for every two sulfide ions in magnesium sulfide. The ratio of Mg to S in the formula unit is
✔ 1:1
.
Explanation:
did it on edge 2020
In a crystal of an ionic compound, a formula unit denotes the most basic elemental ratio.
What do you mean by ionic compound?
Ions, which have positive and negative charges respectively, are the building blocks of ionic compounds, which are neutral substances.
In a crystal of an ionic compound, a formula unit denotes the most basic elemental ratio.
A crystal is composed of several atoms that are organised in a predictable way.
In magnesium sulphide, there are two magnesium ions for every two sulphide ions. The formula unit has a 1:1 Mg to S ratio.
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In the reaction, 2K (s) + 2H2O (l) produces 2KOH (aq) produces H2 (g), which of the reactants is a solid
Answer:
k
Explanation:
2K (s) + 2H2O (l) produces 2KOH (aq) produces H2 (g),
2K (s) + 2H2O (l) --> 2KOH (aq) + H2 (g)
(s) = solid
(l) = liquid
(g) = gas
Left hand side are reactants
2K (s) + 2H2O (l)
Right hand side are products
2KOH (aq) + H2 (g)
4. How many grams of ammonium carbonate are needed to decompose in order to produce
6.52g of carbon dioxide? Ammonium oxide is the other product.
(NH4)2(CO,) – (NH4)2O + CO2
Answer:
14.23g of (NH4)2CO3
Explanation:
We'll begin by writing the balanced equation for the reaction.
(NH4)2CO3 –> (NH4)2O + CO2
Next,, we shall determine the mass of (NH4)2CO3 that decomposed and the mass of CO2 produced from the balanced equation. This is illustrated below:
Molar mass of (NH4)2CO3 = 2[14+(4x1)] + 12 + (16x3)
= 2[14 +4] + 12 + 48
= 2[18] + 60 = 96g/mol
Mass of (NH4)2CO3 from the balanced equation = 1 x 96 = 96g
Molar mass of CO2 = 12 + (2x16) = 44g/mol
Mass of CO2 from the balanced equation = 1 x 44 = 44g.
Summary:
From the balanced equation above,
96g of (NH4)2CO3 decomposed to produce 44g of CO2.
Finally, we can determine the mass of (NH4)2CO3 that decomposed to produce 6.52g of CO2 as follow:
From the balanced equation above,
96g of (NH4)2CO3 decomposed to produce 44g of CO2.
Therefore, Xg of (NH4)2CO3 will decompose to produce 6.52g of CO2 i.e
Xg of (NH4)2CO3 = (96 x 6.52)/44
Xg of (NH4)2CO3 = 14.23g
Therefore, 14.23g of (NH4)2CO3 is needed to produce 6.52g of CO2.
Main group elements have valence electrons in which suborbitals? Question 5 options: A) d and f B) s and d C) p and f D) s and p
Answer:
s and p
Explanation:
The main group elements includes elements in Groups 1-2 and Groups 13-18. Groups 1-2 on the periodic table are the s block elements which means the valence electrons are located in the s suborbital. Groups 13-18 on the periodic table are the p block elements which means the valence electrons are located in the s and p orbitals.
Calculate the theoretical yield and percent yield for this experiment
Answer:
A. Theoretical yield of KCl is 36.49g
B. Percentage yield of KCl is 90.4%
Explanation:
The balanced equation for the reaction is given below:
2KCLO3 —> 2KCl + 3O2
Next, we shall determine the mass KClO3 that decomposed and the mass KCl produce from the balanced equation. This is illustrated below:
Molar mass of KClO3 = 39 + 35.5 + (16x3) = 122.5g/mol
Mass of KClO3 from the balanced equation = 2 x 122.5 = 245g
Molar mass of KCl = 39 + 35.5 = 74.5g/mol
Mass of KCl from the balanced equation = 2 x 74.5 = 149g.
From the balanced equation above,
245g of KClO3 decomposed to produce 149g of KCl.
A. Determination of the theoretical yield of KCl. This is illustrated below:
From the balanced equation above,
245g of KClO3 decomposed to produce 149g of KCl.
Therefore, 60g of KClO3 will decompose to produce = (60 x 149)/245 = 36.49g of KCl.
Therefore, the theoretical yield of KCl is 36.49g
B. Determination of the percentage yield of KCl. This can be obtaine as follow:
Actual yield = 33g
Theoretical yield = 36.49g
Percentage yield =..?
Percentage yield = Actual yield /Theoretical yield x 100
Percentage yield = 33/36.49 x 100
Percentage yield of KCl = 90.4%
What color would you expect a weak base to turn the paper?
Which fourth-period element, X, forms the compound Lewis structure of the molecule X O 3. The X atom is central with three oxygen atoms connected by double bonds. Each oxygen atom has two lone pairs of electrons. As Br Kr Ga Ge Se
Answer:
Ga
Explanation:
The fourth period element that is able to form a compound whose lewis structure is XO3 with X as the central atom and three oxygen atoms must be an element in group thirteen in the periodic table.
Gallium is known to form a trioxo- compound in which all gallium atoms are connected to oxygen atoms via double bonds. We don't have this type of compound formed by any other atom listed among the options hence the answer given above. The compound is written as GaO3.
The central atom is a gallium atom, which has the symbol Ga.
We can arrive at this answer because:
According to the octet rule, an atom must have 8 electrons in the valence layer to achieve electrical stability.These atoms can achieve this stability through covalent or ionic bonds.According to the above question, we can state that an X atom received 6 electrons, as three oxygen atoms shared 2 atoms each with the X atom.In this case, the atom x must have 2 atoms in the valence layer, to reach 8 atoms with the bonds it made with the oxygens.Among the response options, Ga is the only one that has 2 electrons in the valence layer, being able to form bonds with oxygen.
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