There are 110 neutrons in the stable isotope of rhenium. The correct option is D.
What are neutrons?A neutron is a subatomic particle that exists in the nucleus of all atoms except simple hydrogen. The name of the particle comes from the fact that it has no electrical charge; it is neutral. Neutrons have a very high density.
With the exception of the single-proton hydrogen nucleus, nuclei require neutrons to be stable. Neutrons are abundantly produced during nuclear fission and fusion.
Through mainly the process of fission, fusion, as well as neutron capture processes, they are a major contributor to the nucleosynthesis of chemical elements within stars.
The element rhenium-185 is made up of 75 protons, 110 neutrons, and 75 electrons. The element rhenium-187 is made up of 75 protons, 112 neutrons, and 75 electrons.
Thus, the correct option is D.
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2. The four parts, or blocks, on the
periodic table are _d, and f.
s, P
a, b
Answer:
s, p
Explanation:
The four parts, or orbitals, on the periodic table are s, p, d, and f.
Which coupling method is sensitive to temperature changes?
Answer:
Direct coupling
Explanation:
Direct coupling is sensitive to changes that occurs in temperature. It is electrical energy transfer using physical contact through a medium that is conductive.
It is useful in the interconnection of 2 circuits. This kind of coupling method can be done by a wire, a resistor or through mettalic bonding.
Draw the product formed when 2-butanol undergoes reaction with TsCl and Et3N. CH3C6H4SO2Cl.
Answer:
Explanation:
In organic chemistry, the reaction between 2-butanol with TsCl and Et3N is known as the tosylation of the alcohol hydroxyl group. Alcohol is being changed to tosylate by the use of tosyl chloride under the influence of a base. Tosylation of alcohol is an example of a nucleophilic substitution reaction. From the image attached below, we will see how the reaction between 2-butanol proceed into the product by using tosyl chloride and a base(Et3N).
Which of the following is an extensive property? a. melting point b. hardness c. color d. volume e. temperature
The answer is d volume. This is because the melting point, color, temperature are all intensive properties. While hardness is neither extensive or intensive. Volume is the only one that is considered an extensive property.
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Answer: volume
explanation:
In which of does the convection only occur in
A. Gases
B. Fluids
C. Liquids
D. Solids
Answer:
B. Fluids
I hope this helps!
Answer:
B
Explanation:
I need help on this!!!!!
How many atoms are represented by one formula unit of aluminum carbonate A12(CO2)3
Answer:
well ,if I have done my sum rights there are
14 atom in the one formula unit of aluminium carbonate.
Answer:
14 atoms
Explanation:
How are most meteoroids formed? A. As the Sun burns, it throws off small, solid particles at a regular rate which are launched into the Solar System. B. They are created in the explosions that occur when stars die and eventually reach the Solar System. C. They are small pieces that are left over from the formation of the Solar System. D. They are small pieces of debris that are the result of collisions of asteroids, comets, moons, and even planets within the Solar System. Will give brainlist
Answer:
It is no. D
Explanation:
Many meteoroids are formed from the collision of asteroids, which orbit the sun between the paths of Mars and Jupiter in a region called the asteroid belt.
Which charts or graphs always use axes both labeled with quantitative values and show individual points of data, meaning that each point matches with one value on the x-axis and one value on the y-axis? Check all that apply.
The graphs which use axes both labeled with quantitative values and show individual points of data include:
Scatter plotsLine graphsBar graphs.What is a Graph?Thus is defined as a pictorial representation of data or variables in an organized or definite manner.
The graphs mentioned above always have each point matching with one value on the x-axis and one value on the y-axis.
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I am timed please help
Answer:
the substance is element.
because an element is pure substance which is made of only one kind of atom.
E
1
1 point
Which of the following is an elemental substance?
Select all the correct answers.
Mercury
2
Oxygen (O2)
3
Platinum
Chlorine (C12)
Carbon Dioxide (CO2)
Answer:
oxygen and Carbon dioxide
From a 2.875 g sample containing only iron, sand, and salt, 0.660 g of iron and 1.161 g of sand were separated and recovered. What was the percent of salt in the original sample
Answer:
36.66%
Explanation:
Step 1: Given data
Mass of iron: 0.660 gMass of sand: 1.161 gMass of the sample: 2.875 gMass of salt: ?Step 2: Calculate the mass of salt
The mass of the sample is equal to the sum of the masses of the components.
m(sample) = m(iron) + m(sand) + m(salt)
m(salt) = m(sample) - m(iron) - m(sand)
m(salt) = 2.875 g - 0.660 g - 1.161 g
m(salt) = 1.054 g
Step 3: Calculate the percent of salt in the sample
We will use the following expression.
%(salt) = m(salt) / m(sample) × 100%
%(salt) = 1.054 g / 2.875 g × 100% = 36.66%
The percent of salt in the original sample containing only iron, sand, and salt is 36.66%.
What is salt?Salt is a mineral made up of primarily sodium chloride.
Seawater contains a vast amount of salt.
Given,
The total mass of the sample is 2.875 g
Mass of iron is 0.660 g
Mass of sand is 1.161 g
Step 1: To find the mass of salt
The total mass of the sample = the sum of the masses of the compounds
m(sample) = m(iron) + m(sand) + m(salt)
2.875 g = 0.660 g + 1.161 g + m(salt)
m(salt) = 2.875 g - 0.660 g - 1.161 g
m(salt) = 1.054 g
Step 2: Calculate the percent of salt in the sample
[tex]\%(salt) = \dfrac{m(salt) }{m(sample)} \times 100\%\\\\\\\%(salt) = \dfrac{1.054 g }{2.875 g} \times 100\% = 36.66\%[/tex]
Thus, the percentage of salt in the sample is 36.66%.
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4. A solution contains 62.1 g of ethylene glycol dissolved in 250.0 g of H2O. Calculate the mass % of ethylene glycol
Answer:
Explanation:
% mass of Ethylene glycol =( mass of ethylene glycol/ mass of solution )x100%
= 62.1 g/ (62.1 + 250 ) x 100%
= 24.24%
Mass percentage is a term that represents the concentration, basically mass by mass percentage. It tells about the percentage of a component in a whole component. Therefore, the mass % of ethylene glycol is 24.24%.
What is percentage by mass?Mass percentage represents the the percentage of each element that is making a particular compound. Mass percentage does not have any unit as numerator and denominator contains the same unit.
Mathematically,
Percentage of mass = (component’s mass ÷ total mass) x 100%
% mass of Ethylene glycol =( mass of ethylene glycol/ mass of solution)x100%
% mass of Ethylene glycol = 62.1 g/ (62.1 + 250 ) x 100
= 24.24%
Therefore, the mass % of ethylene glycol is 24.24%.
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In run 1, you mix 7.9 mL of the 43 g/L MO solution (MO molar mass is 327.33 g/mol), 3.13 mL of the 0.040 M SnCl2 in 2.0 M HCl solution, 5.49 mL of 2.0 M HCl solution, and 3.43 mL of 2.0M NaCl solution. What is the [H3O+]? Remember that there is a contribution of H3O+ from two solutions.
Answer:
Concentration of H3O⁺ [H3O⁺] = 0.864 M
Explanation:
Given that:
The mass concentration of MO = 43 g/L
The volume of MO = 7.9 mL = 7.9 × 10⁻³ L
Recall that
The mass number of MO = Mass concentration of MO × Volume of MO
The mass number of MO = (43 g/L) * (7.9 × 10⁻³ L)
The mass number of MO = 0.3397 g
number of moles of MO = (mass number of MO) / (molar mass of MO)
number of moles of MO = (0.3397 g) / (327.33 g/mol)
moles of MO = 0.00104 mol
The total volume = 7.9 mL + 3.13 mL + 5.49 mL + 3.43 mL
The total volume = 19.95 mL = 19.95 × 10⁻³ L
Concentration of MO [MO} =(number of moles of MO) / (total volume)
[MO] = 0.00104 mol / 19.95 × 10⁻³ L
[MO] = 5.2130 × 10⁻⁸ M
the number of moles of H3O⁺ = molarity of HCl in the solution × the volume of HCl in solution
the number of moles of H3O⁺ = [(2.0 M) * (3.13 mL)] + [(2.0 M) * (5.49 mL)]
the number of moles of H3O⁺ = 17.24 mmol
Concentration of H3O⁺ [H3O⁺] = (the number of moles of H3O⁺) / (total volume)
Concentration of H3O⁺ [H3O⁺] = (17.24 mmol) / (19.95 mL)
Concentration of H3O⁺ [H3O⁺] = 0.864 M
The Concentration of H3O⁺ [H3O⁺] is 0.864 M
Calculation of the H3O⁺ concentration:But before that following calculations should be needed.
The mass number of MO = Mass concentration of MO × Volume of MO
= (43 g/L) * (7.9 × 10⁻³ L)
= 0.3397 g
Now
number of moles of MO = (mass number of MO) / (molar mass of MO)
= (0.3397 g) / (327.33 g/mol)
= 0.00104 mol
Now
The total volume = 7.9 mL + 3.13 mL + 5.49 mL + 3.43 mL
= 19.95 mL
= 19.95 × 10⁻³ L
Now
Concentration of MO [MO} =(number of moles of MO) / (total volume)
= 0.00104 mol / 19.95 × 10⁻³ L
5.2130 × 10⁻⁸ M
Now
the number of moles of H3O⁺ = molarity of HCl in the solution × the volume of HCl in solution
= [(2.0 M) * (3.13 mL)] + [(2.0 M) * (5.49 mL)]
= 17.24 mmol
Now
Concentration of H3O⁺ [H3O⁺] = (the number of moles of H3O⁺) / (total volume)
= (17.24 mmol) / (19.95 mL)
= 0.864 M
Hence, The Concentration of H3O⁺ [H3O⁺] is 0.864 M
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what is Corona virus And explain breifly in
Answer:
it is a viral disease . it is infected by one person to other .
why is a lot of energy needed to break covalent bonds
Answer:
The strength of a bond between two atoms increases as the number of electron pairs in the bond increases.
Explanation:
The particles in a gas have more space between them because
Answer:
They are more spread out.
Explanation:
The atoms and molecules in gases are much more spread out than in solids or liquids. They vibrate and move freely at high speeds. A gas will fill any container, but if the container is not sealed, the gas will escape. Gas can be compressed much more easily than a liquid or solid.
Answer:
Explanation:
Explanation:
Gas – In a gas, particles are in continual straight-line motion. The kinetic energy of the molecule is greater than the attractive force between them, thus they are much farther apart and move freely of each other. In most cases, there are essentially no attractive forces between particles
What does the 2+ mean??
Convert a speed of 933 cm/s to units of inches per minute
Answer:
220000 in/min
Explanation:
Step 1: Write out conversions
1 in ≈ 2.54 cm
60 sec = 1 min
Step 2: Set up dimensional analysis
[tex]\frac{933cm}{s} (\frac{60s}{1min} )(\frac{1in}{2.54cm} )[/tex]
Step 3: Evaluate
220039.4 in/min
Step 4: Sig figs
There are 3 sig figs
220039.4 in/min ≈ 220000 in/min
The value of ΔG°′ΔG°′ for the conversion of glucose-6-phosphate to fructose-6-phosphate (F6P) is +1.67 kJ/mol+1.67 kJ/mol . If the concentration of glucose-6-phosphate at equilibrium is 2.95 mM2.95 mM , what is the concentration of fructose-6-phosphate? Assume a temperature of 25.0°C25.0°C .
Answer:
The concentration of fructose-6-phosphate is 1.50x10⁻³M
Explanation:
Gibbs Free energy, ΔG°, is defined as:
ΔG° = -RTln K
Where ΔG° = 1670J/mol
R is gas constant = 8.314J/molK
T is absolute temperature (25°C + 273.15 = 298.15K)
Thus, equilibrium constant, k, is:
1670J/mol = -8.314J/molK* 298.15K ln K
-0.6737 = ln K
0.5098 = K
K of the reaction:
G6P ⇄ F6P
is:
K = 0.5098 = [F6P] / [G6P]
As [G6P] is 2.95x10⁻³M:
0.5098 = [F6P] / [2.95x10⁻³M]
[F6P] = 1.50x10⁻³M
The concentration of fructose-6-phosphate is 1.50x10⁻³MWhy do fireworks produce different colors
Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Energy is the only factor that determines the color of light of fireworks.
What is element?Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.
Fireworks has many different types of element. When any element is given an energy. Then the process of excitation of electrons takes place from its outermost shells. Every element absorb characteristic wavelength of energy and releases light to the corresponding wavelength.
Therefore, energy is the only factor that determines the color of light of fireworks.
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To obtain the number of meters from a distance measured in centimeters, you must
By the number
Answer:
Divide by 100
Explanation:
Which of the following changes lead to a decrease in entropy?
a. mixing of pure gases
b. sugar dissolving in coffee
c. melting snow
d. the sublimation (vaporization) of dry ice (solid carbon dioxide)
e. halving the volume of a gas
Answer:
halving the volume of a gas
Explanation:
Entropy refers to the degree of disorderliness of a system. The greater the volume of a gas, the greater its entropy. The entropy of a system is directly proportional to its volume.
Hence a decrease in the volume of a gas leads to a decrease in its entropy. Ultimately, if the volume of a given mass of gas is halved, its entropy decreases according.
Observations made during an experiment are called
What property of matter is a
measure of the force of
gravity on an object?
Answer:
No matter where that object is in the vast universe, it will have the same mass. Weight, on the other hand, is a measure of how much gravitational force is exerted on an object.
what is formed when polyatomic ions bond with other ions.
A) ionic compounds.
B) neutral compounds.
C) ionic elements.
D) neutral elements.
Answer:
iconic compounds is your anwser
Answer:
Iconic Compounds
Explanation:
I watched a video about it.
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Use the drop-down menus to identify the career that matches each description Helos employees and management negotiate: Oversees payment of employees Maintains employee records, such as contact information: Oversees the Human Resources department of a company.
Answer:
✔ Labor Relations Specialist
✔ Compensation and Benefits Manager
✔ Human Resources Assistant
✔ Human Resources Manager
B
D
A
C
Answer:
Helps employees and management negotiate:
✔ Labor Relations Specialist or B.)
Oversees payment of employees:
✔ Compensation and Benefits Manager or D.)
Maintains employee records, such as contact information:
✔ Human Resources Assistant or A.)
Oversees the Human Resources department of a company:
✔ Human Resources Manager or C.)
Imagine that you are developing a TLC plate, but you get distracted and forget to take the TLC plate out. Later, when you remove your TLC plate from the developing chamber, you notice that the solvent front has reached the top of the TLC plate. How will the Rf values from this TLC plate compare with those of a student who stopped developing their TLC plate before the solvent front reached the top of the plate
Answer:
The full form of TLC is Thin layer chromatography which is used in separating non volatile mixtures.
Explanation:
In the context, the Rf values could not be read properly or determined properly and accurately if the solvent front flows to the top of the plate. If the solvent reaches the plate's top, then the Rf values reading will be different from the TLC plate where the solvent did not reach the plate's top.
If the solvent front reaches the top, then it is not possible to accurately determine draw the line and to determine how far the spot went. And thus it would be difficult to solve the ratio as the plate would keep advancing or developing and also the compound spot keeps rising. As a result, spots reaches higher or rises than the normal rise but the solvent front does not change, it remains same. Thus, the Rf value would be completely off.
convert 5 liters into kiloliters
Answer:0.005
Explanation:kilo means 1000 do you divide 5 by 1000 and you get.005
Answer: 0.005 kilolitres
Explanation:
5 liters = 0.005 kilolitres
Why? Because liters - kilolitres: ÷ 1000
Cuci
what is the formula?
Answer:
Copper(I) chloride, commonly called cuprous chloride, is the lower chloride of copper, with the formula CuCl. The substance is a white solid sparingly soluble in water, but very soluble in concentrated hydrochloric acid. Impure samples appear green due to the presence of copper(II) chloride.
Explanation:
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