Answer:
sorry i donntttt understand make it clear
Water forms according to the equation below: 2H2(g) + O2(g) 2H2O(g) Hrxn = -483.64 kJ How much energy is released during the formation of 1 mol H2O(g)?
Answer:
Hrxn = -241.82 kJ
Explanation:
2H2(g) + O2(g) --> 2H2O(g) Hrxn = -483.64 kJ ............. (i)
The equation for formation of 1 mol of H2O is given as;
H2(g) + 1/2O2(g) --> H2O(g) ................. (ii)
Eqn (ii) is obtained by dividing eqn (i) by 2
That means the heat of reaction for eqn (ii) is given as;
Hrxn = -483.64 kJ / 2
Hrxn = -241.82 kJ
Answer:-241.82 kJ
Explanation:
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When polluted water runs off into rivers and groundwater, it reduces the amount
of
available for sustaining life.
Answer:
Sewage pollutes our waters with pathogens, excess nutrients, heavy metals, and other toxins. It kills aquatic life and creates algal blooms that can suffocate fisheries. Sewage carries pathogens that can end up in our drinking water supplies and swimming areas.
Missing:
Explanation:
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Protons are a subatomic particle. Which description below accurately describes a proton's charge, location, and mass?
a) A proton is in the nucleus, has no charge, and atomic mass of 1 amu.
b) A proton is outside the nucleus, has a negative charge, and is so small it doesn't contribute to the mass.
c) A proton is in the nucleus, has a positive charge, and an atomic mass of 1 amu.
d) A proton is outside the nucleus, has a positive charge, and is so small it doesn't contribute to the mass.
Answer: C) a proton is in the nucleus, has a positive charge, and an atomic mass of 1 amu.
Explanation:
Protons are positive so they give a positive charge, they are also never outside of the nucleus. Only electrons are outside the nucleus.
Consider the reaction Mg₂Si(s) + 4 H₂O(ℓ) → 2 Mg(OH)₂(aq) + SiH₄(g). How many grams of silane gas (SiH₄) are formed if 25.0 g of Mg₂Si reacts with excess H₂O?
Answer:
10.60 grams of silane gas are formed.
Explanation:
From the reaction:
Mg₂Si(s) + 4H₂O(l) → 2Mg(OH)₂(aq) + SiH₄(g)
We know that the limiting reactant is Mg₂Si, so to find the mass of SiH₄ formed we need to calculate the number of moles of Mg₂Si:
[tex]\eta_{Mg_{2}Si} = \frac{m_{Mg_{2}Si}}{M_{Mg_{2}Si}}[/tex]
Where:
m: is the mass of Mg₂Si = 25.0 g
M: is the molar mass of Mg₂Si = 76.69 g/mol
[tex]\eta_{Mg_{2}Si} = \frac{m_{Mg_{2}Si}}{M_{Mg_{2}Si}} = \frac{25.0 g}{76.69 g/mol} = 0.33 moles[/tex]
Now, the stoichiometric relation between Mg₂Si and SiH₄ is 1:1 so:
[tex] \eta_{Mg_{2}Si} = \eta_{SiH_{4}} = 0.33 moles [/tex]
Finally, the mass of SiH₄ is:
[tex] m_{SiH_{4}} = \eta_{SiH_{4}}*M_{SiH_{4}} = 0.33 moles*32.12 g/mol = 10.60 g [/tex]
Therefore, 10.60 grams of silane gas are formed.
I hope it helps you!
What happens to electrons in an ionic bond?
Answer:
the metal loses electrons to become a positively charged cation
Explanation:
HELP PLEASE || TEN PTS WILL MARK BRAINLEST ||Reaction B could produce a substance with a pH of...
Group of answer choices
4.
14.
10.
7.
Answer:
the answer is 4
Explanation:
i took the test and got it right and i would recommend using quizlet it has these flash cards and the answers are there you just click on the one that says your question and it will say your answer on the back. It helps with most of my test! Hope this helps (:
Which organelle in cytoplasm is responsible for carrying hereditary information?
Answer:
Nucleus
Explanation:
The nucleus serves as the cells command center, sending direction to the cell to grow, mature, divide, or die
What is the molarity of NaOH if 300.mL of
5.00M HCl is titrated with 200.mL of NaOH?
which basic postulates of Dalton's atomic theory are modified by the modern atomic theory
Answer:
Dalton's atomic theory has been modified as
Explanation:
Atoms of same element may not have same atomic mass. For example, some atoms of chlorine have atomic mass 35 amu while others have atomic mass 37 amu. Such atoms of same element having different atomic masses are called isotopes
Answer:
On the basis of new experimental facts, Dalton's atomic theory has been modified as: ... Atoms of same element may not have same atomic mass. For example, some atoms of chlorine have atomic mass 35 amu while others have atomic mass 37 amu. Such atoms of same element having different atomic masses are called isotopes.
Explanation:
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How many atoms are in 5.31 mol of Iron?
Answer:
3.77 moles of Fe contain 2.27 × 10, 24 as an exponent
how many moles of MgO can be made from 10 moles of fe2O3?
Answer:
Fe 2 O3 .
Explanation:
What are chemical formulaes?
give your own response!!
Answer:
is a way of presenting information about the chemical proportions of atoms
Explanation:
A volume of 20.0L of oxygen is warmed from -30.0C to SATP condition. What is the new volume if the pressure is kept constant
Which is the most important part of the food web? Producers, decomposers, carnivores, or herbivores
Answer:
All parts of the food chain are very important for if one is part of the food chain is tooken away than other parts of the food chain will be affected.
Explanation:
Answer:
all is important
Explanation:
What is the relationship between melting/boiling point and intermolecular forces
How do movement of rocks cause earthquakes?
Answer:
Well its actually the movement of tectonic plates under the earths surface that when the slide along each other, pull away from each other, or push up against each other they create earth quakes.
Explanation: yes.
Answer ASAP Homework
Answer:
1.98 ×10^2 g
Explanation:
follow the method in the above image
Which diagram shows two waves with different amplitudes and the same wavelengths?
Answer: a
Explanation:
im big brain
The diagram that shows two (2) waveforms with different amplitudes but the same wavelengths is: Diagram A.
A wave can be defined as a disturbance that is created in a medium, which progressively transports energy from a source to another location without the transportation of matter. Some of the parameters that are associated with a waveform include the following:
SpeedCrestFrequencyWavelengthAmplitudeAmplitude refers to the maximum displacement of a wave when measured from its equilibrium position.
In the attached diagram, the amplitudes are 1 meter and 0.5 meter.Wavelength refers to the distance between two (2) successive crests (troughs) of a wave.
In the attached diagram, the wavelengths are 2 meters respectively.Note: Amplitude is measured vertically from an equilibrium position while wavelength is measured horizontally.
In conclusion, Diagram A shows two (2) waveforms with different amplitudes but the same wavelengths.
Find more information on wave here: https://brainly.com/question/23460034
why the iron nail not rusted on a chemical to absorb water vapour
Answer:
Thus there was no accumulation of ions on the nails, as the dissolved gases were already removed, hence no rust formation. In test tube C, a chemical was added to absorb the water vapour. We know that rust formation takes place when a metal is exposed to water vapour.
Explanation:i hope u have a wonderful night and stays safe
5.Explain how to convert the mass of a substance into mole
Answer:
............................................
The diagram shows the different models of the atom that eventually led to the modern atomic theory.
Which model was proposed as a result of Rutherford's scattering experiment where positive particles did not pass straight through a foil as expected? (5 points)
Model A
Model B
Model C
Model D
Answer:
B.
Explanation:
The atomic model represents the position of the sub-atomic particles. Model A was proposed after Rutherford's scattering experiment where the positive particles were deflected in the middle. Thus, option A is correct.
What was Rutherford's atomic model?Rutherford's atomic model proposed the presence of the positive nucleus in the middle of the atom while the electrons surrounded them in their orbitals with a negative charge.
He performed the scattering experiment where alpha particles emitted by the radioactive element were used to locate the positions of the electrons, neutrons, and protons.
According to the experiment, model A, best fits as the nucleus made of protons and neutrons takes the center of the atom with negative electrons surrounding them. The nucleus is small as compared to the entire atom.
Therefore, option A. model A best proposes Rutherford's model.
Learn more about Rutherford's model here:
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Red is dominant to white for flower color in a particular plant. If a red flowered plant (RR) is crossed with a white flowered plant (rr), what color will the offspring be?
Answer:
The offspring will all have red-colored flowers
Explanation:
A dominant character is one that is always expressed when it is present.
A recessive character or trait is one that is only expressed in the absence of the dominant character. Thus, when the dominant and recessive character are both present in an organism, the recessive character will be hidden while the dominant character will be expressed.
According to Menedel's laws of inheritance, in the cross between the dominant (RR) red-flowered plant and the recessive (rr) white-flowered plant, the genotype of the offspring will be as follows:
RR x rr = Rr, Rr, Rr,Rr
The offspring are all heterozygous for flower color. However, since red flower color is dominant over white flower color, all the offspring produced will have red-colored flowers.
Need quick! Please help rn! THANK YOU!
Answer:
B. Unbalanced force
Explanation:
Answer:
I think its unbalanced force
Explanation:
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(HELP ASAP) what is the reaction for Si + S₈ --> Si₂S₄
Answer:
Synthesis reaction~~~~~~~
Explanation:
Two or more substances combined but not chemically, are called what?
Answer:
a mixture
Explanation:
Two or more substances combined chemically, are called a compound
Argon atom can exist freely in nature, why
Answer:
Argon can exist freely in nature because it has a full octet of electrons the way its found in the nature is the same way its found in periodic table of element in vast amouts of stabilization.
Difference girteen tungsten and nichrome
Answer:Tungsten is made of tungsten while Nichrome is made of nickel chromium. ... Tungsten is used to make filament of bulbs. Nichrome have high resistivity than tungsten.
Explanation:i hope u have a wonderful night and stay safe
Arrange these Alkaline Earth metals from lowest to highest electronegativity: Ca, Be, Ba, Sr
Ca is -2
Be is stabilized
Ba is -4
Sr is -3
so it would be => Ba, Sr, Ca, Be
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The arrangement of the alkaline earth metals from the lowest to highest electronegativity is; Ba< Sr< Ca<Be
Electronegativity refers to the ability of the atoms of an element in a compound to attract the shared electrons of that bond towards itself. It is a property that decreases down the group but increases across the period.
Electronegativity increases across the period as atoms of elements become smaller in size and decreases down the group because of increase in distance between the valence electrons and nucleus.
Since electronegativity decreases down the group, the order of electronegativity from lowest to highest is; Ba< Sr< Ca<Be
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Which of the following factors is the most in-
fluential in the formation of soil?