Answer:
true
Explanation:
Because water has a ability to flow electricity through it
How many atoms of oxygen are in 2. 50 moles of so2?
The number of atoms of oxygen are present in 2.50 moles of sulfur dioxide is 30.110 × 10²³.
What is Avogadro's number?Avogadro's number is define as the number of atoms present in one mole of any substance and it is equal to 6.022 × 10²³.
In the 1 mole of SO₂ 2 moles of oxygen are present. So that in 2 moles of SO₂, 2(2.5) = 5 moles of oxygen is present.
No. of atoms of oxygen in 5 moles of oxygen will be calculated as:
No. of atoms = 5 mole × 6.022 × 10²³atoms per mole = 30.110 × 10²³atoms
Hence number of atoms of oxygen is 30.110 × 10²³.
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What is the pressure (in atm) in a 5. 00 l tank with 37. 50 grams of oxygen gas at 350 k?
The pressure (in atm) in a 5 L tank with 37.50 grams of oxygen gas at 350 K is 6.715 atm.
How do we calculate the pressure of gas?Pressure of gas will be calculated by using the ideal gas equation as:
PV = nRT, where
P = pressure = ?
V = volume = 5 L
R = universal gas constant = 0.082 L.atm / K.mol
T = temperature = 350 K
n is the moles of gas and it will be calculated as:
n = W/M, where
W = given mass = 37.50 g
M = molar mass of oxygen = 32g/mol
n = 37.50/32 = 1.17 mol
On putting all these values, we get
P = (1.17)(0.082)(350) / (5) = 6.715 atm
Hence resultant pressure of the oxygen gas is 6.715 atm.
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How many total atoms are in one molecule of cobalt hydroxide?
Answer: Hello! I'm Jungkook. Here is your answer.....
1 Atom.
Explanation:
Hope this helps! Anneyong/Bye!
xoxoKookie
How many moles is 3.48 g of carbon?
[tex]\text{No. of moles } = \dfrac{\text{Mass of substance(C)} }{\text{Molar mass of substance(C)}}\\\\\\~~~~~~~~~~~~~~~~~~~=\dfrac{3.48}{12}~ \text{mol}\\\\\\~~~~~~~~~~~~~~~~~~~=0.29~ \text{mol}[/tex]
Pedro adds 1.25 moles of helium to a balloon that already contained 4.51 moles of helium creating a balloon with a volume of 8.97 liters. What was the volume of the balloon before the addition of the extra gas
Answer:
don't know what u mean by that
Explanation:
so help me
What occurs as energy is transferred through the radiative zone of the sun? check all that apply. gamma rays are produced. photons are absorbed and reemitted. energy is transferred through the large-scale movement of material. photons are scattered in many directions. energy is released into the photosphere.
Answers:
1) Photons are absorbed by hot gas atoms.
2) Energy is transferred through large-scale movement of material.
3) Energy is released into the photosphere.
The Sun interior is divided into three regions: the inner core, the radiative zone and the convection zone.
The inner core is the central region of the Sun and all solar energy is produced in the core by nuclear fusion.
Radiative zone is around the inner core and in this area energy is transported by radiation.
The convection zone is the outer-most layer of the interior and in this area energy is transported by convection.
when a 16.9 g sample of NaOH dissolves in 70.0 g of water in a calorimeter, the temperature rises from 22.4°C to 86.6°C. calculate ΔH for the process
NaOH(s) → Na(aq) + OH(aq) ΔH = ?
ΔH for the process is -252.3 cal/mol or -1056 j/mol.
What is Enthalpy of Solution ?A solid salt compound dissociates in liquid water to form an aqueous solution of its constituent ions.
This is a chemical reaction, with the required heat change at constant pressure termed the enthalpy of solution.
If this value is positive, then the final prepared solution will have a lower temperature than the starting pure solvent.
Conversely, a negative enthalpy value results in a solution temperature that is higher than the starting solvent temperature.
It is given that
NaOH (s) → Na (aq) + OH (aq)
mass of NaOH is 16.9 g
mass of water = 70 g
ΔT = 86.6-22.4 °C = 64.2 °C
q = m × Cg × ΔT
q = amount of energy released or absorbed
m = mass
Cg = specific heat capacity
ΔT = change in temperature
n = m ÷ M
n = moles of solute
m = mass of solute
M = molar mass of solute
ΔHsoln = q ÷ n
ΔHsoln = molar enthalpy (heat) of solution
q = amount of energy (heat) released or absorbed
n = moles of solute
Cg= 1 cal/gm/°C
Now substituting the values in the equation
q = m × Cg × ΔT
q = 16.9 * 1 * 64.2
q = 1085 cal
n = m ÷ M
M= 70/18=3.9
n=16.9/3.9
n=4.3
ΔH = q ÷ n
ΔH =1085 /4.3
ΔH= -252.3 cal/mol or -1056 j/mol
Therefore ΔH for the process
NaOH(s) → Na(aq) + OH(aq)
is -252.3 cal/mol or -1056 j/mol
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How many moles of hydrogen gas would be required to produce 25 moles of H2O?
Answer:
There would be 25 moles
Explanation:
This is the equation for water (synthesis):
2H₂ + O₂ → 2H₂O
Since there are 25 moles of water, the moles of hydrogen gas will have 25 moles.
What is the concentration of cu2 in the other half-cell? (assume the concentration in the unknown cell to be the lower of the two concentrations. )
The concentration of the copper half cell with 0.22 V is [tex]\rm \bold{5.7\;\times\;10^{-11}\;M}[/tex].
What is half cell?In the electrochemical cell, the reduction and oxidation takes place in different electrodes, and thereby it is termed as half cell. The standard cell potential of the given cell is 0 V.
The reduction potential of one half cell cathode is considered to be given as 1.6 mM. The cell potential is 0.22 V.
The potential of the half cell is given as:
[tex]\rm E=E^\circ_{cell}-\dfrac{0.059}{n}\;log\dfrac{anode}{cathode}\\\\0.22\;V=0-\dfrac{0.059}{2}\;log\dfrac{anode}{1.6\;\times\;10^-^3\;M}\\\\Anode\;conc.=5.7\;\times\;10^{-11}\;M[/tex]
The concentration of the copper half cell with 0.22 V is [tex]\rm \bold{5.7\;\times\;10^{-11}\;M}[/tex].
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Based on your observations, do you think any of the samples are the same substance?
Yes
Yes
No
No
Explain your answer below.
How many molecules are in 368 g of potassium hydroxide (KOH)?
Answer: 6.559055381954511
Explanation:
Which place has the best conditions for using solar energy?
A.
Somewhere with long days that is always cloudy
B.
A place that has long days with the sun out all day
C.
Somewhere with short days with the sun out all day
D.
A place that has short days and is mostly overcast
how many moles of sodium sulfate will be formed if you start with 2.00 moles of sodium
Answer:
The molecular weight of sodium sulfate is 142.1 g/mol. To calculate the mass of sodium sulfate, substitute the values in the formula. Therefore, the mass of sodium sulfate formed when we start with 200.0 grams of sodium hydroxide and you have excess sulphuric acid is 355.25g.
When a stone is dipped in a glass containing some water, the level of water rises but when a
spoon of sugar is added to it and stirred, the water level does not rise? why?
Explanation:
It's so because we know that stone is insoluble, ain't it, so it takes space in water & the water level rises.
But, when a spoon of sugar is added to water, it is soluble & hence mixes with water, so it doesn't rise.
I Hope this helps! (ㆁωㆁ)
list the symbols for the noble gases
Answer:here:
Explanation:helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson (Og).
Which model states that an acid is a substance that contains hydrogen and ionizes to produce hydrogen ions?.
Answer:
The Arrhenius model
Explanation:
The Arrhenius state that an acid is a substance that contains hydrogen and ionizes to produce hydrogen ions in aqueous solution.
How many moles of hydrogen are required to react with 2 moles of oxygen?
Answer:
4 moles of H2
Explanation:
From the equation, twice as many
2 moles of O2 requires 4 moles of H2
1mol of Oxygen requires 2 moles of Hydrogen
Moles of oxygen=2Moles of Hydrogen
2(2)4molesDuring photosynthesis and cellular respiration plus carry out processes that involve both light and energy and chemical energy. Sort each tile into the correct column.
-Used to directly power cell growth
-Used to directly power photosynthesis
-Released through cellular respiration
-Captured by chloroplyll
Chemical energy power cell growth, solar radiation power photosynthesis and is captured by chlorophyll, and carbon dioxide is released through cellular respiration.
Photosynthesis and RespirationDuring photosynthesis, solar radiation is captured by chlorophyll in green plants, and this is used to fix inorganic carbon dioxide and water to produce plant food in the form of carbohydrates.
During respiration, the carbohydrates synthesized via photosynthesis are broken down chemically to extract the energy locked in them. Carbon dioxide is produced as a by-product.
The energy extracted by respiration is used to power metabolic processes in plants.
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Which answer choice best explains why atoms of carbon-14 (c-14) are unstable? atoms of c-14 have too many negatively charged electrons and too few positively charged protons. atoms of c-14 have too many positively charged protons and too few negatively charged electrons. there are 2 more protons than neutrons in the nucleus. there are 2 more neutrons than protons in the nucleus.
The best choice that explains why atoms of carbon-14 (c-14) are unstable is there are 2 more protons than neutrons in the nucleus
What is a stable atom?An atom is said to be stable if the number of neutrons in the nucleus is greater than number of protons in the nucleus, because the the neutrons increases the nuclear force which keeps the atom stable.
Thus, the best choice that explains why atoms of carbon-14 (c-14) are unstable is there are 2 more protons than neutrons in the nucleus.
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Answer:
D. there are 2 more neutrons than protons in the nucleus.
Explanation:
What is the ph of a solution that is 0. 50 m in hcooh (aq)? pka = 3. 75 for hcooh (aq)?
The pH of a solution that is 0.50 M in HCOOH is 2.045.
How do we calculate the pH?pH of the solution will be calculated by taking the negative logarithm of the concentration of H⁺ ion.
Given chemical reaction will be:
HCOOH(aq) ⇄ H⁺(aq) + HCOO⁻(aq)
Initial: 0.50 0 0
Equilibrium: 0.50-x x x
Given that, pKa = 3.75
Ka = [tex]10^{-pKa}[/tex]
Ka = [tex]10^{-3.75}[/tex] = 0.000178
Ka for the above equation will be written as:
Ka = [H⁺][HCOO⁻]/[HCOOH]
Ka = (x)² / (0.50-x)
x is negligible as compared to 0.5, so the equation becomes
0.000178 = (x)² / 0.50
x² = (0.000178)(0.5) = 0.000089
x = 0.009
[H⁺] = 0.009M
pH will be calculated as:
pH = -log(0.009) = -(-2.045) = 2.045
Hence pH of the solution is 2.045.
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The chemical formula for glucose (sugar) is C6H12O6. What are the individual numbers called in a chemical formula?
Subscript
Superscript
Coefficient
Exponent
The individual numbers which are present in chemical formula is subscript.
What is chemical formula?Chemical formula of any compound of chemistry consist more than one atoms in it and gives idea about the number of atoms present in that compound.
Given chemical formula of glucose is C₆H₁₂O₆.
In the given chemical formula of glucose, number which shows the amount of carbon, hydrogen and oxygen are known as subscripts.
Hence, individual number are subscript.
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!! How much has CO2 in the atmosphere increased since the Industrial Revolution? In the 10,000 years before the Industrial Revolution in 1751, carbon dioxide levels rose less than 1 percent. Since then, they've risen by
Answer:
Im pretty sure its B) 43
Explanation:
What is created by the fusion of three helium nuclei?
- nitrogen
- iron
- oxygen
- carbon
- hydrogen
Answer:
carbon nuclei...........
Write the equation for the reaction between hcl and naoh
The chemical equation for the reaction between HCl and NaOH is HCl+NaOH → NaCl+H₂O.
What is neutralization reaction?Neutralization reactions are those in which an acid and base reacts for the formation of water molecule and salt.
Chemical reaction between the hydrochloric acid and sodium hydroxide base is shown by the below equation
HCl + NaOH → NaCl + H₂O
Where sodium chloride is a salt.
Hence the chemical equation is HCl + NaOH → NaCl + H₂O.
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Calculate the energy needed to vaporize 37.8 g of diethyl ether
The energy i.e. needed is 26.8 kJ of energy
The calculation is as follows:
the moles of diethyl ether is
= 1.01 moles
Since one mole of diethyl ether require heat = 26.8 kJ
Now the energy should be the same i.e. 26.8
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Some greenhouse gases, such as fluorocarbons (CFCs, HFCs, PFCs, etc.), are human-made. Others, such as water, methane, and carbon dioxide, are naturally produced. Which type of greenhouse gas (human-made or natural) is more difficult to control and eliminate? Which types are easier? In three to five sentences, provide evidence for your argument.(4 points)
The natural types of greenhouse gases are more difficult to control and eliminate while the human-made type are easier.
What are greenhouse gases?Greenhouse gases are specific type of gases that have the ability to trap and release heat in their bonds.
Greenhouse gases are the cause of global warming, which is the gradual increase in temperature of the Earth's atmosphere.
However, greenhouse gases can either occur naturally or be synthesized artificially. The naturally-occuring greenhouse gases like CO2 are more difficult to control because they are not produced by humans.
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How many grams of nacl are present in 350 ml of a 0. 277 m solution of sodium chloride? a 1. 66 g b 16. 2 g c none of these d 97. 0 g e 5. 67 g
A NaCl solution of 350 mL volume and a concentration of 0.277 M will contain 5.67 grams of the salt.
Mole calculationRecall that:
Mole = molarity x volume.
Also:
Mass = mole x molar mass
Hence;
Mole of 350 mL, 0.277 NaCl = 0.350 x 0.277 = 0.097 moles
Mass of 0.097 moles NaCl = 0.097 x 58.44 = 5.67 grams
Thus, a 350 mL, 0.277 M NaCl solution will contain 5.67 grams of the salt.
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What else is produced during the replacement reaction of silver nitrate and potassium sulfate? 2agno3 k2so4 ag2so4 ________ kno3 2kno3 k2 2agno3
When silver nitrate reacts with potassium sulfate, the products would be silver sulfate and potassium nitrate.
Products from reactionsThe reaction between silver nitrate and potassium sulfate is a double replacement reaction that is represented by the following equation:
[tex]2 AgNO_3 + K_2SO_4 --- > Ag_2SO_4 + 2 KNO_3[/tex]
Thus, the products are silver sulfate ([tex]Ag_2SO_4[/tex]) and potassium nitrate ([tex]KNO_3[/tex]).
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Answer:
A
Explanation:
Question 1 (1 point)
The term insoluble refers to substances that readily dissolve
True
False
Question 2 (1 point)
Ionic solids will most likely dissolve in
a liquid water, which is a nonpolar solvent
b liquid water, which is a polar solvent
c liquid carbon tetrachloride, which is a nonpolar solvent
Question 3 (1 point)
Carbon dioxide gas is most soluble in water under conditions of
a high pressure and low temperature
b high pressure and high temperature
c low pressure and low temperature
d low pressure and high temperature
Question 4 (1 point)
The amount of a salt that will dissolve in a given volume of water depends primarily on the
a surface area of the salt crystals
b temperature of the water
c rate at which the salt and water are stirred
d pressure on the surface of the water
Question 5 (1 point)
The attraction between water molecules and an Na+ ion or a Cl– ion occurs because water molecules are
a linear
b symmetrical
c polar
d nonpolar
Answer:
Substances that dissolve most readily in water include ionic compounds and polar covalent compounds. aqueous solution. water that contains dissolved substances. solvent. the dissolving medium in a solution.
Explanation:
The isotope tritium has a half-life of 12. 3 y. Assume we have 11 kg of the substance. How much tritium will be left after 51 y? answer in units of kg
Half-life is a time in which the concentration of the substance gets reduced to 50% of the initial concentration. The number of tritium that will be left after 51 years is 0.624 kg.
What is an isotope?Isotopes are chemical substances that have the same atomic number but different atomic mass because they have a different number of neutrons in the nuclei.
The half-life of the isotope, tritium is 12.3 years. Assuming we have 11 kg of substance and a number of years 51 years.
[tex]11 \times 2 ^{\frac{-51}{12.3}} = 0.6239 \;\rm kg[/tex]
Therefore, the number of tritium that will be left after 51 years is 0.624 kg.
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