Answer:
Zn2+ is colourless
Explanation:
We know that transition metal salts are usually coloured due to the possibility of d-d transition.
This d-d transition can only occur when there are vacant d-orbitals. The electronic configuration [Ar] 4s23d8 suggests the presence of vacant d-orbitals and the possibility of the compounds of Zn2+ being coloured.
However, the absence of colours in Zn2+ compounds shows that there is no d-d transition(electronic) spectra observed for Zn2+ because the d orbitals are completely filled. This means that the correct electronic configuration of the ion is [Ar] 3d10.
Under identical conditions, separate samples of O2 and an unknown gas were allowed to effuse through identical membranes simultaneously. After a certain amount of time, it was found that 7.88 mL of O2 had passed through the membrane, but only 3.69 mL of of the unknown gas had passed through. What is the molar mass of the unknown gas
Answer:
146.5g/mol
Explanation:
The volume of gas effused is directly proportional to the square root of its relative molecular mass.
Let the volume of oxygen gas be V1
Let the volume of the unknown gas be V2
Let the molar mass of oxygen be M1
Let the molar mass of the unknown gas be M2
V1/V2 =√M2/M1
7.88/3.69 = √M2/32
2.14 = √M2/32
(2.14)^2 = M2/32
4.58 = M2/32
M2 = 32*4.58
M2 = 146.5g/mol
An initial substance used in a chemical reaction is called a
1.
chemical reaction
2.
reactant
3.
product
4.
new substance
CH4(g) gas reacts with F2(g) to produce CH3F(g) and HF(g) .
a) A particulate representation of F2(g) is shown above its formula in the equation below. Using the key provided, draw particulate representations of CH4(g) and the two product molecules of the reaction above their formulas in the equation.
Answer:
I am looking for this as well. Can someone please help!
Explanation:
Answer:
here you go :)
Explanation:
i know it isn't pretty but i hope you use it well
what causes deep ocean currents to flow
Answer:Deep ocean currents (also known as Thermohaline Circulation) are caused by: ... The sinking and transport of large masses of cool water gives rise to the thermohaline circulation, which is driven by density gradients due to variations in temperature and salinity. The earth's rotation also influences deep ocean currents.
Explanation:
What force on Earth can affect the pull of gravity?
Objects with more mass have more gravity. Gravity also gets weaker with distance. So, the closer objects are to each other, the stronger their gravitational pull is. Earth's gravity comes from all its mass.
Answer:
the moon or the sun
Explanation:
1.24 moles of magnesium arsenate are dissolved in 1.74 kg of solution. Calculate the molality of the solution.
Answer:
Molality of the solution = 0.7294 M
Explanation:
Given:
Number of magnesium arsenate = 1.24 moles
Mass of solution = 1.74 kg
Find:
Molality of the solution
Computation:
Molality of the solution = Mole of solute / Mass of solution = 1.74 kg
Molality of the solution = 1.24 / 1.7
Molality of the solution = 0.7294 M
The octane rating of gasoline is a relationship of the burning efficiency of the given gasoline mixture to the burning efficiency of octane (C8H18). Like most hydrocarbons, octane reacts with oxygen gas to produce carbon dioxide and water. The unbalanced equation for this reaction is
Answer:
C₈H₁₈(l) + O₂(g) ⇒ CO₂(g) + H₂O(l)
Explanation:
Let's consider the unbalanced equation for the combustion reaction of octane.
C₈H₁₈(l) + O₂(g) ⇒ CO₂(g) + H₂O(l)
We can begin balancing H atoms by multiplying H₂O by 9, and C atoms by multiplying CO₂ by 8.
C₈H₁₈(l) + O₂(g) ⇒ 8 CO₂(g) + 9 H₂O(l)
Finally, we get the balanced equation by multiplying O₂ by 12.5.
C₈H₁₈(l) + 12.5 O₂(g) ⇒ 8 CO₂(g) + 9 H₂O(l)
Answer:
The coefficents will be 2, 25 --> 16, 18
Explanation:
The ground below your feet moves at the rate at which... Look at the picture.
Answer:
i dont know
Explanation:heheheheh
Splitting of a signal in a proton NMR spectrum tells us the number of chemically non-equivalent hydrogens in the immediate vicinity of the hydrogen giving the signal.
a. True
b. False
Answer:
True
Explanation:
In a given molecule protons in the same chemical environment absorb at the same applied field strength; whereas protons with different chemical environments absorb at different applied field strengths.
A set of protons in the same chemical environment are said to be equivalent. Hence, the number of signals in the NMR spectrum tell us the number of sets of equivalent protons present in the molecule.
Splitting of a signal in a proton NMR spectrum tells us the number of chemically non-equivalent hydrogens in the immediate vicinity of the hydrogen giving the signal.
which properties represent a metal ( select all that apply )
a. malleable
b. shiny
c. dull
d. brittle
e. good conductors
Why is the combined gas law the most practiced gas law
Which word best describes gamma rays?
A)Weak
B)Destructive
C)Visible
D)Harmless
Answer:
Explanation:
Destructive :D
According to the position of gamma rays in electromagnetic spectrum,the word which best describes gamma rays is destructive as they have high energy.
What is electromagnetic spectrum?The electromagnetic spectrum consists of electromagnetic radiation which consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.
The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.
In vacuum ,all the electromagnetic waves travel at the same speed that is with the speed of air.The position of an electromagnetic wave in an electromagnetic spectrum is characterized by it's frequency or wavelength.They are emitted by electrically charged particles which undergo acceleration and subsequently interact with other charged particles.
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Each year, due to growing population and energy demands, the United States faces increasing dependency on conventional fossil fuels. However, in the past few decades renewable energy has begun to expand in both residential and commercial sectors of the United States.
a)
i. The U.S. uses roughly 4.0 million Gigawatt-hours per year in electricity. Currently 50% of our electricity comes from coal. If every 1.0 kilowatt-hour of coal burned releases 2 lbs. of carbon dioxide, how much carbon dioxide is released from burning coal for electricity each year in the US?
ii. What will be the reduction of carbon dioxide entering the atmosphere each year if coal usage could be reduced by 15% by utilizing solar energy?
iii. List and discuss TWO advantages to using wind energy to generate electricity.
b) Identify and describe a type of passive OR active solar heating method.
c) Give one advantage and one disadvantage to the method you described above in question b).
Answer:
A) (i) 4*10^12 Ibs , (ii) 600 * 10^9 Ibs
(iii)
Wind energy is a clean energy : this is because there is no consumption of fossil fuels when using wind energy to generate electricityWind energy is a renewable energy : wind is reusable and it is always available for useB) The use of bricks or stone that can absorb the solar heat easily when the sun rays heat them up and this solar heat absorbed . is a typical example of a passive solar heating system.
C) Advantage : It is mostly cost free
disadvantage : there is no storage mechanism
Explanation:
A) Given that U.S uses roughly 4 million Gigawatt-hours per year in electricity and 50% of the electricity comes from coal
i) Determine how much carbon dioxide is released from burning coal each year
since 50% of electricity comes from coal
The Total energy produced by coal =2*10^12 Kw-h. also
1.0 kilowatt-hour of coal burned releases 2 lbs.
hence the Total amount of Carbon dioxide released from burning coal each year = 2 * 2 * 10^12 = 4 * 10^12 Ibs
ii) Determine the reduction of carbon dioxide entering the atmosphere each year if coal usage could be reduced by 15% by utilizing solar energy
= 15% 0f 4*10^12
reduction of coal usage by 15% = 600 * 10^9 Ibs hence the amount of coal entering the atmosphere is reduced by 600 * 10^9 Ibs
iii) Advantages of using wind energy to generate electricity
Wind energy is a clean energy : this is because there is no consumption of fossil fuels when using wind energy to generate electricityWind energy is a renewable energy : wind is reusable and it is always available for useB) Passive solar heating system
The use of bricks or stone that can absorb the solar heat easily when the sun rays heat them up and this solar heat absorbed . is a typical example of a passive solar heating system.
C) advantage and disadvantage of solar heating system
Advantage : It is mostly cost free
disadvantage : there is no storage mechanism
The unit cell for tin (Sn) has tetragonal symmetry, with a and b lattice parameters of 0.583 and 0.318 nm, respectively. If its density, atomic weight, and atomic radius are 7.30 g/cm3, 118.69 g/mol, and 0.151 nm, respectively. Determine its atomic packing factor.
Answer:
0.1334
Explanation:
The number of atoms per unit (n) is given by:
[tex]n=\frac{\rho a^2bN_a}{A} \\\\where\ a=5.83*10^{-8}cm,b=a=3.18*10^{-8}cm,\rho=7.3\ g/cm^3,\\N_a=Avogadro\ number=6/022*10^{23} mol^{-1},A=atomic\ weight\\=118.68 \ g/mol\\\\n=\frac{7.3* (5.83*10^{-8})^2*(3.18*10^{-8})*6.02*10^{23}}{118.69}\\\\n=4\ atoms/unit[/tex]
The atomic packing factor (APF) is:
[tex]APF=\frac{n(\frac{4\pi R^3}{3} )}{a^2b} \\\\But\ R=atomic\ radius=1.51*10^{-8}\ cm\\\\APF=\frac{4(\frac{4\pi (1.51*10^{-8})^3}{3} )}{(5.83*10^{-8})^2*3.18*10^{-8}}\\\\APF=0.1334[/tex]
Please help asap! Brainliest to correct answer.
What is the volume of 2.1 moles of nitrogen gas at standard temperature and pressure (STP)?
Select one:
a. 11 L
b. 22 L
c. 47 L
d. 82 L
Answer:
47 L will be the volume STP
Explanation:
24 * All the following hormones help in the appearance of beard in the adult male,
except
Answer:21
Explanation:sadadasdasdad
Answer:
Facial hair growth is largely propelled by testosterone, a hormone. Testosterone levels can vary. For men between 19 and 38, the normal range is 264 to 916 nanograms per deciliter
Where is ocean water the densest?
1.The surface
2.The bottom
3.The middle
4.Lake Michigan
Answer:
your answer should be the bottom
sorry if im wrong
Explanation:
Pleas answer ASAP!! If the empirical formula of an organic compound is CH2O then the molecular mass of the compound could be? 15 grams 45 grams 60 grams 135 grams
Answer:
uhh 60??
Explanation:
The molecular mass of the compound could be 60g, the correct option is option c among all the given options.
What is molecular mass?The weight of a molecule is measured by its molecular mass. Atomic weight is another name for it. It usually involves multiplying the total mass of all the atoms in the molecule by the overall number of the element's atoms.
For instance, there are two hydrogen atoms and one oxygen atom in water. The atomic weight of oxygen multiplied by two or more to get the typical hydrogen atomic mass gives the water molecule its mass. The atoms that make up the molecule are what determine an element's molecular mass.
Empirical formula is CH[tex]_2[/tex]O
Mass of Empirical formula =12+12+16=30g
Vapour density = Molar mass of compound/2
30= Molar mass/2
Molar mass of compound =60g
Therefore, the molecular mass of the compound could be 60g, the correct option is option c among all the given options.
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The surface area of a star can be estimated based on the stars
Can someone answer this question please. Is this a physical change or chemical change?
Answer:
Chemical
Explanation:
the acid is a chemical and the molecules are getting torn apart by the acid
How does photosynthesis affect food chains and food webs?
Answer:
Throughout the clarification section, the description of the situation is summarized.
Explanation:
Plant species mostly with such as photosynthesis have been providing us with just the very first food processing commodity.
They are always the component of the environment, the meals they consume, our clothing, and sometimes even our appliances, and plenty of other components or consumables. Seedlings often extract the greenhouse effect from either the environment, offer additional shelter for far too many species.A student says that since the atomic theory is just a theory, it should not be considered useful. Which statement best argues against the student's opinion? (2 points) Scientific theories change over time. Scientific theories are the results of many experiments and observations. Scientists often do not agree about specific details of scientific theories. Scientists often propose competing theories. Scientific theories do not become Scientific Laws.
Answer:
Scientific theories are the results of many experiments and observations.
Explanation:
I think this is ti sorry if I'm wrong :|
what is the force on a 1,000 kg elevator that is falling freely at 9.8 m/s2
Answer:
The only force on it is its weight, w=9800N
Explanation:
Where does the light that makes the moon visible come from?
A. another planet
B. the moon
C. Earth
D. the sun
correct name for PtO.
Answer:
It may stand for 'Paid Time Off'
Explanation:
I need more context but that's probably it.
Answer:
gracias
Explanation:
please help me ill give you 9 points for your help
Answer:
it should be Robert Boyle
Answer:
Robert Boyle
Explanation:
he relationship between the volume and pressure of a given amount of gas at constant temperature was first published by the English natural philosopher Robert Boyle over 300 years ago.
14.) Analyze: What pattern do you see?
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Q
1
The process by plant cells to use sunlight to create glucose is called Photosynthesi, cellular, active, passive, or osmosis
Answer:
PHOTOSYNTHESIS
Explanation:
Photosynthesis is the process by which plant take in Carbondioxde and water in the present of sunlight in order to produce glucose and oxygen
Organelles_____are specialized structures that carry out particular jobs and functions?
Answer:
Cell or cellular
Explanation:
Heyy!! Not sure, but cell and cellular are the same. They carry out particular jobs and functions. Hope this helps, thank you :) !!
One mole (mol) of ethanol (C2H60) has a mass of 46.0684 g.
How many moles of ethanol are in an 18.0 g sample?
Need to see how the calculation was done.
Answer:
the number of moles of ethanol is 18 g sample is 0.390 mol
Explanation:
The computation of the number of moles of ethanol is 18 g sample is shown below:
= Mass of ethanol sample ÷ molar mass of ethanol
= 18 g ÷ 46.064=84 g
= 0.390 mol
Hence, the number of moles of ethanol is 18 g sample is 0.390 mol