Answer:
1.22gram of hydrogen is needed to react
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 0.40 g mass of hydrogen is needed to react with 32 g of copper oxide.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
Mathematically,
CuO + H[tex]_2[/tex]→ Cu + H[tex]_2[/tex]O
mole of copper oxide= 32 /79.54
=0.40 mole
The mole ratio between copper oxide and hydrogen is 1:1
mole of hydrogen= 0.40 mole
mass of hydrogen = 0.40 mole×1g/mol
= 0.40 g
Therefore, 0.40 g mass of hydrogen is needed to react with 32 g of copper oxide.
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I need HELP A.S.P
B. A +ion (positive ion, one with extra positive charge)?
calculate the mass of butane needed to produce 64.1 g of carbon dioxide to three significant figures and appropriate units
Answer:
21.2 gm
Explanation:
calculate the mass of butane needed to produce 64.1 g of carbon dioxide to three significant figures and appropriate units
butane is the hydrocarbon C4H10
in combustion, we react hydrocarbons with O2 to form CO2 and H2O
so
C4H10 + O2----------------> CO2 + H2O
BALANCE
2C4H10 + 1302--------> 8CO2 + 10 H2O
the molar mass of CO2 is 12 + 16X2 = 44
64.1 gm of CO2 is
64.1/44 = 1.46 MOLES OF CO2,
FOR EVERY 8 MOLES OF CO2 WE NEED 2 MOLES OF BUTANE IT IS A
8:2 OR 4:1 RATIO. THE MOLES OF C4H10 ARE 1/4 THE MOLES OF CO2
SO
THE MOLES OF C4H10 H10 ARE 1.46/4 =0.365 MOLES
THE MOLAR MASS OF BUTANE IS 58.12
0.365 MOLES OF C4H10 HAS A MASS OF 0.365 X 58.12 = 21.2 gm
2. Which is true regarding water? A. Compound of element B. Element of gases C. Mixture of gases D. Substances of gases
D or A im not fully sure about my answer on that
how does the molecular geometry change if you replace a bond with a lone pair?
Answer:
The overall molecular shape (the molecule geometry) changes because of the lone pairs repulsion, but the electron geometry does not change because whether an atom or a lone pair is added there's still two electrons being added.
Explanation:
hope that helps :D
Answer:
Un par solitario o par de electrones no compartidos es un par de electrones de valencia que no se encuentra formando un enlace, ni compartido con otros átomos. Cuando un átomo se agrupa con otros para formar una molécula, sus electrones más externos -también conocidos como electrones de capa de valencia- dejan de pertenecer únicamente al átomo del que provienen, pasando a pertenecer a la molécula formada. Los orbitales atómicos de valencia dejan de existir como tales y pasan a formar orbitales moleculares con características diferentes a las originales. Como los pares solitarios se encuentran en la capa más externa de los átomos, cuando estos átomos forman moléculas pasan a formar parte del conjunto de electrones de valencia de la molécula. De esto se deduce que los pares solitarios son, de hecho, un subconjunto de los electrones de valencia de la molécula a la que pertenecen.
Explanation:
espero que te sirva :)
An Oxygen atom Isotope has an overall charge of -1. How many electrons does it have?
Answer:
8 electrons.
Explanation:
4 Fe + 3 O2 ----> 2 Fe2O3
How many moles of iron(III) oxide, Fe2O3 , will be produced if 4 moles of iron, Fe, are consumed.
Answer:
320 gm
Explanation:
4 Fe + 3 O2 ----> 2 Fe2O3 How many moles of iron(III) oxide, Fe2O3 , will be produced if 4 moles of iron, Fe, are consumed
for every 4 moles of Fe, 2 moles of Fe2O3 are produced.
Fe2O3 has a molar mass of (56 X 2) + (16 X 3) = 112 + 48 =160
160 X 2 =320 gm
Please someone help WHATS the answer
What is the wavelength, in nm, of the light photon emitted by a hydrogen atom when an electron goes from n
Answer:
Hence, the wavelength of the photon associated is 1282 nm.
Explanation:
how many electrons does Fe-55 have
Iron-55 (55Fe) is a radioactive isotope of iron with a nucleus containing 26 protons and 29 neutrons.
Answer:
54
Explanation:
yep
:) help please I sent in a photo
Answer:
I think it's C I think that's the answer
Which objects are scratched?
Answer:
We would need a picture to help you out with this.
Explanation:
What is the frequency of radiation whose wavelength is 2.40×10
Answer:
24
Explanation:
2.40*10=24.0
a substance that cannot be broken down into simpler substances
Elements are pure substances that cannot be broken down into simpler substances by ordinary chemical means.
the electron pair geometry around the central iodine in I3- is
The electron pair geometry around the central iodine in I3- is trigonal bipyramidal.
The shapes of molecules is determined by the Valence Shell Electron Pair Repulsion theory (VSEPR). According to this theory, The shape of a molecule depends on the number of electron pairs that surround the valence shell of the central atom in the molecule.
In the structure I3-, the iodine is sp3d hybridized and has a bond angle of 180°. There are three iodine atoms. The central iodine atom is surrounded by two bond pairs and three lone pairs. The electron pair geometry around the central iodine in I3- is trigonal bipyramidal.
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Help here plz you guys
Recognize: What happens if a hypothesis is not supported.
Explain: Why do scientists practice scientific inquiry?
Describe: The behaviors scientists use in their work.
Answer:
If the initial hypothesis is not supported, you can go back to the drawing board and hypothesize a new answer to the question and a new way to test it. ... Either way, the process of experimentation often leads to whole new questions to explore.
Scientific inquiry uses evidence from observations and investigations to create logical explanations to answer questions related to science. Scientific inquiry is different from the scientific method. ... Scientific inquiry helps you think outside the box to understand the natural world.
Unlike social scientists, behavioral scientists collect empirical data and use experimental methods, including testing, controls and manipulated settings.
Explanation:
which molecule or ion has a trigonal planar geometry around its central atom?
Answer:
Structure of boron trifluoride, an example of a molecule with trigonal planar geometry.
Explanation:
Having studied the data for patterns and trends, you should now be able to draw
some conclusions about how knowing the half-life of the element Lokium would
help you determine the absolute age of rock in which this element is found. In a
paragraph, create an imaginary example of finding a given amount of Lokium and
DOL in a rock, and then determining the absolute age of that rock. Assume that
each trial represents 1,000 years
Answer:
The situation given here is imaginary such that the life of Rock has to be found using the half-life of the element lokium that has been found inside the rock.
Half-life of any material is the amount of time taken by that particular material to decay. Now the amount of lokium found in rock can show after how many half-lives this amount has been left out.
The time elapsed will be log (L) atoms X half-life.
Explanation:
How
many
moles is 2.55 X 1026 atoms of Neon?
Answer:
423.44 moles
Explanation:
A 0.100 g sample of phosphoric acid (H3PO4, MW 99.0 g/mol), a tri-protic acid, requires 35.0 mL of a NaOH solution for neutralization. What is the molarity of the NaOH solution
Answer:
0.0866 M
Explanation:
answer key
The molarity of the NaOH solution has been 0.0865 M.
The neutralization reaction of the Phosphoric acid and NaOH results in the formation of sodium phosphate and water.
The balanced chemical equation can be given as;
[tex]\rm H_3PO_4\;+\;3\;NaOH\;\rightarrow\;Na_3PO_4\;+\;3\;H_2O[/tex]
Thus for the neutralization of 1 mole of Phosphoric acid, 3 moles of NaOH has been used.
The moles of phosphoric acid in 0.100 grams sample:
Moles = [tex]\rm \dfrac{weight}{molecular\;weight}[/tex]
Moles of phosphoric acid = [tex]\rm \dfrac{0.100}{99}[/tex]
Moles of phosphoric acid = 0.001 mol
For the neutralization of 0.001 moles of NaOH:
1-mole Phosphoric acid = 3 moles NaOH
0.001-mole Phosphoric acid =0.003 moles of NaOH.
The molarity of the NaOH solution:
Molarity = [tex]\rm \dfrac{moles}{Volume\;(L)}[/tex]
Molarity of NaOH = [tex]\rm \dfrac{0.003}{0.035}[/tex]
Molarity of NaOH = 0.0865 M
The molarity of the NaOH solution has been 0.0865 M.
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Which of the following solutions represents a good buffer system? a solution that is 0. 10 mol L-1 HF and 0. 10 mol L-1 CH3COONa a solution that is 0. 10 mol L-1 HCl and 0. 10 mol L-1 NH4 a solution that is 0. 10 mol L-1 CH3COOH and 0. 10 mol L-1 CH3COOLi a solution that is 0. 10 mol L-1 NaOH and 0. 10 mol L-1 KOH a solution that is 0. 10 mol L-1 HCl and 0. 10 mol L-1 KCl.
Answer:
first
Explanation:
0. 10 mol L-1 HF and 0. 10 mol L-1 CH3COONa a solution that is 0 is a good buffer system. so, option A is correct.
What is buffer system ?When acids or bases are introduced, a buffer system is a solution that resists changing in pH. Acidic solutions have pH values under seven and significant hydrogen ion ( H+ ) concentrations. Basic solutions have pH values higher than seven and high quantities of hydroxide ions ( OH- ).
The carbonate, carbonic acid buffer, the phosphate buffer, and the buffering of plasma proteins make up the body's chemical buffer system.
Plasma proteins, phosphate, bicarbonate, and carbonic acid buffers are among the buffer systems active in blood plasma. By excreting hydrogen ions and producing bicarbonate, which helps keep blood plasma pH within a normal range, the kidneys contribute to the regulation of acid-base balance.
Thus, option A is correct.
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2. For each of the six elements aluminium (Al), boron (B), nitrogen (N), oxygen (O) phosphorus (P), sulfur (S), write down:
a. the period of the periodic table to which it belongs.
b. its group number in the periodic table.
c. its proton number (atomic number).
d. the number of electrons in one atom.
e. its electronic configuration.
f. the number of outer-shell electrons in one atom.
g. Which of the above elements would you expect to have similar properties?
Elements in the same group of the periodic table tend to have similar chemical properties
What is the periodic table?For Al;
a. Period: Period 3
b. Group: Group 13
c. Proton Number (Atomic Number): 13
d. Number of Electrons: 13
e. Electronic Configuration: 1s² 2s² 2p⁶ 3s² 3p¹
f. Number of Outer-Shell Electrons: 3
g. Similar Properties: Boron (B)
For Boron (B):
a. Period: Period 2
b. Group: Group 13
c. Proton Number (Atomic Number): 5
d. Number of Electrons: 5
e. Electronic Configuration: 1s² 2s² 2p¹
f. Number of Outer-Shell Electrons: 3
g. Similar Properties: Aluminium (Al)
For Nitrogen (N):
a. Period: Period 2
b. Group: Group 15
c. Proton Number (Atomic Number): 7
d. Number of Electrons: 7
e. Electronic Configuration: 1s² 2s² 2p³
f. Number of Outer-Shell Electrons: 5
g. Similar Properties: Phosphorus (P)
For Oxygen (O):
a. Period: Period 2
b. Group: Group 16
c. Proton Number (Atomic Number): 8
d. Number of Electrons: 8
e. Electronic Configuration: 1s² 2s² 2p⁴
f. Number of Outer-Shell Electrons: 6
g. Similar Properties: Sulfur (S)
For Phosphorus (P):
a. Period: Period 3
b. Group: Group 15
c. Proton Number (Atomic Number): 15
d. Number of Electrons: 15
e. Electronic Configuration: 1s² 2s² 2p⁶ 3s² 3p³
f. Number of Outer-Shell Electrons: 5
g. Similar Properties: Nitrogen (N)
For Sulfur (S):
a. Period: Period 3
b. Group: Group 16
c. Proton Number (Atomic Number): 16
d. Number of Electrons: 16
e. Electronic Configuration: 1s² 2s² 2p⁶ 3s² 3p⁴
f. Number of Outer-Shell Electrons: 6
g. Similar Properties: Oxygen (O)
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Describe how to do an experiment to show that when you dissolve salt in water the salt is still there.
Answer:
When salt is dissolved in water, the particles of salt get into the spaces between particles of water and starts dissolving and disappear.
Explanation:
life situation scenario that portrays the modernization and professionalism of the Philippine National Police Organization as per discussed under RA 6975.
Answer:
members shall perform their duties with integrity, intelligence and competence in the application of specialized skill and technical knowledge with excellence and expertise.
Explanation:
any members on duty should be wiling and ready to help at all times
How many molecules of H2O are there in 200,000,000L of gas at STP?
1. Describe what happens when two substances at different temperatures come into contact. Describe how the
law of conservation of energy applies to this system.
Answer:
Explanation:
When two substances at different temperatures like into contact, the substance that is at higher temperature will transfer energy, in the form of heat, to the substance that is at lower temperature, until their temperatures get equal.
In this case, if the two substances are isolated of the rest of the universe, the law of conservation of energy states that the heat released by the substance initially at higher temperature is the same amount of heat gained by the substance originally at lower temperature.
6. A 10.0 g sample of krypton has a temperature
of 25 °C at 575 mmHg. What is the volume, in
milliliters, of the krypton gas?
Considering the definition of ideal gas law, the volume of the Krypton gas is 3840 mL.
An ideal gas is a theoretical gas that is considered to be composed of point particles that move randomly and do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.
The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:
P×V = n×R×T
where P is the gas pressure, V is the volume that occupies, T is its temperature, R is the ideal gas constant, and n is the number of moles of the gas. The universal constant of ideal gases R has the same value for all gaseous substances.
Now, taking into account this law, and isolating the pressure variable (P), you get:
[tex]V=\frac{nxRxT}{P}[/tex]
In this case, you know:
n= [tex]10 gramsx\frac{1 mole}{83.80 grams} =[/tex]0.119 moles, where 83.80[tex]\frac{grams}{mole}[/tex] is the molar mass of Krypton, that is, the amount of mass that a substance contains in one mole.R= 0.082 [tex]\frac{atmL}{moleK}[/tex]T= 25 C=298 kP= 575 mmHg=0.756579 atm (being 1 atm=760 mmHg)Replacing in the ideal gas law:
[tex]V=\frac{0.119 molesx0.082 \frac{atmL}{moleK}x298K}{0.756579 atm}[/tex]
Solving:
V=3.84 L= 3840 mL (being 1 L=1000 mL)
Finally, the volume of the Krypton gas is 3840 mL.
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What mass of KBr (in grams) do you need to make 250. 0 mL of a 1. 50 MKBr solution?.
Answer:
KBr final solution:
V = 250mL --> 0.25L
Concentration/Molarity = 1.5 mol/L
To find the amount of moles of KBr here, just multiply the volume by the concentration (0.25 x 1.5 = 0.375 mol)
So the amount of moles for KBr is 0.375 mol. Now we know that the mass divided by the molar mass (the atomic mass values of K and Br in the periodic table added together) would give us the amount of moles aswell.
n = moles
m = mass
M = molar mass
n = m/M
so if we rearrange this equation to find mass, we would get:
m = n x M
Molar mass for KBr: (39.09) of K + (79.90) of Br = 118.99
m = 0.375 mol x 118.99
m = 44.62g
Therefore 44.62g of KBr is needed to make 250mL of a 1.5 M KBr solution.
A red car and a black car begin to accelerate from rest at the same time. The red car accelerates at a constant rate of 3 meters per square second. The motion of the black car is shown in the graph below.imageWhich of the following statements correctly compares the acceleration of the two cars?A.While the cars are accelerating, the red car accelerates faster than the black car.B.While the cars are accelerating, the black car accelerates faster than the red car.C.The red car only accelerates faster than the black car for the first second of acceleration.D.The black car only accelerates faster than the red car for the first second of acceleration.
That car moves or accelerates faster which has the higher speed.
If the red car accelerate at higher speed than black car then the red car reach first on the destination but if the black car moves with higher speed than red car then the black car reach its destination earlier than the red car.
The conclusion can be drawn when the image is present or any data but there is no data or image present which provides us accurate information so we can conclude logically that car which moves at higher speed will move faster than the other car.
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What is the
name of the
compound
Na2Co3?
Answer:SODIUM CARBONATE
Explanation:
column table in two words?
Answer:
a table is a grid of rows and columns that intersect to form cells
Explanation: