The pH of a solution of H₂SO₄ that has [H₃O⁺] is 5.45 × 10⁻⁵ M, is 4.26.
What is pH?pH is define as the negative logarithm of the concentration of H⁺ or H₃O⁺ ions, and it is represented as:
pH = -log[H⁺]
Concentration of H₃O⁺ in H₂SO₄ solution = 5.45 × 10⁻⁵ M
pH of H₂SO₄ solution will be calculated as:
pH = -log(5.45 × 10⁻⁵)
pH = -(-4.26)
pH = 4.26
Hence required pH is 4.26.
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Answer:
4.26 is the answer
Explanation:
edge 2022
What element is commonly used to reduce iron oxide?
Answer:
The element that is commonly used to reduce iron oxide would be carbon.
Explanation:
:)
Iron oxide is reduced to a lower oxide or metal by gaseous carbon monoxide or solid carbon.
What is Reduction?Reduction is defined as the chemical reaction which involves addition of hydrogen or removal of oxygen or gain of electrons.
For example,
2Na + H2 → 2NaH (addition of hydrogen)
CuO + H2 → Cu + H2O(removal of oxygen)
Fe3+ + e- → Fe2+ (gain of electron)
Above example of reduction reaction is when oxygen reacts with iron to form rust. In this reaction oxygen is reduced because it accepts electrons from iron, which is oxidized.
Thus, Iron oxide is reduced to a lower oxide or metal by gaseous carbon monoxide or solid carbon.
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5.0 g of copper was heated from 20°C to 80°C. How much energy was used to heat Cu? (Specific heat capacity of Cu is 0.38 J/g °C)
114°
Explanation:
ΔE = mcΔT
ΔE = 5(0.38)(80 - 20)
ΔE = 1.9(60)
ΔE = 114°
I have 5 questions that need help to answer 1) What are covalent bonds and how do they form ? 2) How do you know which elements and how many of each are in a compound ?
3) How can you find how many valence electrons an atom has ?
4) How many valence electrons do atoms need to be happy? Which elements are the exceptions?
Answer:
covalent bond- a chemical bond that is the sharing of electron pairs between atoms
Determine the empirical formula of a compound containing 48. 38 grams of carbon, 6. 74 grams of hydrogen, and 53. 5 grams of oxygen.
In an experiment, the molar mass of the compound was determined to be 180. 15 g/mol. What is the molecular formula of the compound?
For both questions, show your work or explain how you determined the formulas by giving specific values used in calculations
Answer:
I recently answered this question. The response I submitted is included below. I beleive my answer should be correct.
Explanation:
Question 1:
C: 48.38g(1mol/12g) = 4.0317
H: 8.12g(1mol/1.01g) = 8.12
O: 53.5g(1mol/16g) = 3.34375
Divide by the smallest amount (3.34375)
C = 4.0317/3.34375 = 1.206 = 1
H = 8.12/3.34375 = 2.42 = 2
O = 3.34375/3.34375 = 1
Empirical formula = CH2O
Question 2:
Molecular formula = n(empirical formula)
n = molar mass (compound)/molar mass (empirical)
Empirical formula: CH2O
Molar mass of CH2O = 12 + 2x1 + 16 = 30 g/mol
Molar mass of compound: 180.15 g/mol
[tex]n=\frac{180.15g/mol}{30g/mol}= 6[/tex]
Molecular formula = C6H12O6
Nitrogen is contained in which of the following?
a. adenine.
b. cytosine.
c. guanine.
d. thymine. d. uracil.
Answer:
DNA contains four nitrogen bases: adenine, thiamine, guanine and cytosine. Adenine and thymine pair, and guanine and cytosine pair.
Explanation:
In combination, nitrogen is found in the rain and soil as ammonia and ammonium salts and in seawater as ammonium (NH4+), nitrite (NO2−), and nitrate (NO3−) ions...
How much heat will be absorbed in
boiling 5 grams of ice at 100°c and
at 1 atm?
How does acid react to water mixed with clorine eyedrops
Answer: Chlorine gas is produced when sulfuric acid is mixed with chlorine bleach.
Explanation: This reaction is a function of the change in pH of the solution from alkaline to acidic combined with the strong oxidant properties of hypochlorous acid.
Make sure to reword this in your words!!!Step 5: place the remaining hydroxy and hydrogen substituents. Review the previous steps to determine the position of the substituents on carbons 1 and 5
Based on the functional groups present in organic compounds, the compound formed from adding hydroxy and hydrogen substituents to carbon atoms is an alcohol.
What are alcohols?Alcohols are organic compounds whose functional group is the hydroxy radical.
The simplest alcohol is methanol whose molecular formula is CH3OH.
The hydroxy group in alcohols are responsible for their properties such as:
solubility- alcohols are soluble in waterhigh boiling points polarityTherefore, the compound formed from adding hydroxy and hydrogen substituents to carbon atoms is an alcohol.
Why is carbon dioxide called a gas and not vapour?
Explanation:
CO2 is called as gas because it exist in single thermodynamics state i.e CO exist in gases state only at room temperature.
really need help with this
This is a microscope.
Hope this clears that up for you.
How many moles of hydrochloric acid are in 500. Ml of a 0. 300 m solution?.
Answer:
300
Explanation:
because it's not highly concentrated
Explain the role of gravity in the waterfall.
Explanation:
A water fall falls and hits the base with force depending on the distance from which it fell.This force is caused by gravity pulling the water molecule as well as some other particles like eroded soil rapidly downwards.
Define acid and base according to lewis theory, arrhenius theory and lawn theory
Answer:
Three principal theories about acid-base are,
1. Arrhenius theory
2. Bronsted-Lowry theory
3. Lux-Flood definition
4. Lewis theory
5. Usanovich definition
1. According to the Arrhenius, acids give up hydrogen ion in aqueous medium and a base give up hydroxyl ion in its aqueous medium. Examples are aqueous solution of HCl, CH3COOH, PhCOOH, and H2SO4. These give up H+ in an aqueous medium. Aqueous solutions of NaOH, Ca (OH)2 are Arrhenius bases.
Arrhenius theory has some limitations. This theory cannot explain the acidic nature of BF3 or basic behavior of NH3. This theory fails to give any explanation about acidity and basicity which does not produce H+ and OH- in their aqueous solutions.
2. According to the Bronsted-Lowry, an acid releases proton and a base accepts proton. NH3 accepts proton and forms ammonium ion, so ammonia acts as a base.
But this theory also has limitations. According to this theory acidic behavior of BF3 still cannot be explained.
3. Lux-Flood describes the acid-base theories based on oxide ion transformation. It gives clear explanation for acid-bases theories of non-protonic system. According to them, a base will donate the oxygen atom and an acid will accept oxygen atom.
4. According to the Lewis theory, acids are those substances which accept electron pair and base are those substances which donates electron pairs. Lewis theory can explain the acidic nature of BF3. In BF3, B is two electrons short to fulfil its octet. So it can accept a pair of electrons from an electron donating substituent. So it is an electron pair acceptor compound and acts as an acid.
Substances which have π electrons can donate electron pair to an electron deficient substance and acts as a base. Ethylene and acetylene is Lewis bases. AlCl3, PCl3 are Lewis acids.
5. According Usanovich, an acid is some chemical species which would react with bases and yields cations or accepts anions or electrons. A base is some chemical species which would react with acids, yield anions or electrons or combine with cations.
Explanation:
_______ oxides are oxides of certain non metals
acidic in naturenature
Generally, Oxides of non-metals are acidic in nature. When non-metals are reacted with water it forms an acidic solution. The common oxides of Sulphur, Selenium, and Bromine are strongly acidic.
A gas has a mass of 3.82 g and occupies a volume of 0.854 L. The temperature in the laboratory is 302 K, and the air pressure is 1.04 atm. calculate the molar mass of the gas.
1) 93.4 g/ mol
2) 72.3 g/ mol
3) 107 g/ mol
4) 35.8 g/mol
The molar mass of the gas that has a mass of 3.82 g and occupies a volume of 0.854 L is 106.66g/mol.
How to calculate molar mass?The molar mass of a substance can be calculated by dividing the mass of the substance by its number of moles.
However, the number of moles of the gas in this question needs to be calculated first using the ideal gas law equation:
PV = nRT
Where;
P = pressureV = volumen = number of molesT = temperatureR = gas law constant1.04 × 0.854 = n × 0.0821 × 302
0.888 = 24.79n
n = 0.888/24.79
n = 0.036mol
Molar mass of gas = 3.82g/0.036mol
Molar mass = 106.66g/mol
Therefore, the molar mass of the gas that has a mass of 3.82 g and occupies a volume of 0.854 L is 106.66g/mol.
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An atom moving at its root mean square velocity at 100. °c has a wavelength of. Which atom is it? assume that the atom is the most abundant isotope of an element.
The atom that moves at its rms velocity at 100°C with a wavelength of 2.31 * 10 m is : SULPHUR ( s )
Determine the molar mass of the atomTo determine the atom we will have to determine the molar mass of the atom
Applying De Broglie equation
λ = h / mv
Vrms = [tex]\sqrt{\frac{3RT}{M} }[/tex] ---- ( 1 )
Where : λ = 2.31 * 10⁻¹¹, R = 8.314 J / k.mol, T = 373 K, h = 6.626 * 10⁻³⁴ J.s
From equation ( 1 )
M = ( h² Ua ) / 3RT*λ² --- ( 2 )
where : Ua ( mass of an atom ) = 6.022 * 10²³, h = 6.626 * 10⁻³⁴, R = 8.314 J / k.mol, λ = 2.31 * 10⁻¹¹, T = 373 K
Insert values into equation ( 2 )
M ( molar mass ) = 32 g/mol
Sulphur has a molar mass of 32 g/mol therefore the atom is sulphur.
Hence we can conclude that The atom that moves at its rms velocity at 100°C with a wavelength of 2.31 * 10 m is : SULPHUR ( s ).
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The compound below is treated with chlorine in the presence of light. Draw the structure for the organic radical species produced by reaction of the compound with a chlorine atom. Assume reaction occurs at the weakest c-h bond.
Explanation:
A carbon radical is a reaction intermediate, which is produced during a free-radical reaction. These carbon radicals contain one unpaired electron on a carbon atom. Hence, these radicals are highly reactive in nature.
A free-radical reaction results in the production of a carbon radical as a reaction intermediate.
What is radical in chemistry?A radical in chemistry is indeed an atom, molecule, and ion that possesses one least one unpaired electron electron. The term "radical" is sometimes used to refer to a free radical. These unpaired electrons provide radicals, with a few exceptions, a high degree of chemical reactivity. Radicals frequently dimerize on their own. The majority of organic radicals have brief lives.
A free-radical reaction results in the production of a carbon radical as a reaction intermediate. One unpaired electron is present on the carbon atom in these radical forms of carbon. As a result, the nature of these radicals is very reactive.
Therefore, a free-radical reaction results in the production of a carbon radical as a reaction intermediate.
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Which staternent about all the noble gases is correct?
A The number of protons in the atoms equals the number of neutrons.
B Their atoms each have a stable arrangement of electrons.
C Their atoms each have eight electrons in their outer shell
D They exist as molecules containing two atoms.
Answer:
B
Explanation:
The electrons in all noble gases are filled with electrons and don't need to involve in a reaction to gain or loss
The answer A is wrong because not all of them has same number of protons equal the neutrons
Answer C is wrong because we can see helium with 2 electrons in outer shell
and Answer D is wrong as we say above each atom doesn't need to react with another to be stable
A mixture of h2 and water vapor is present in a closed vessel at 20.00°c. the total pressure of the system is 755.0 mmhg. the partial pressure of the water vapor 17.50 mmhg. what is the partial pressure of h2? type in your answer using the correct number of significant figures. mmhg
The partial pressure is the pressure exerted by a single gas in a volume of the mixture. The partial pressure of dihydrogen is 737.5 mmHg.
What is Dalton's law?According to Dalton's law, the sum of partial pressure of non-reacting gases gives the total pressure of the system.
Given,
Total pressure = 755.0 mmHg
The partial pressure of water = 17.5 mmHg
The partial pressure of dihydrogen = ?
The partial pressure of dihydrogen is calculated as:
[tex]\begin{aligned}\rm p_{total} &= \rm p_{H_{2}O} + p_{H_{2}}\\\\755.0 &=\rm 17.5 + p_{H_{2}}\\\\&= 737.5 \;\rm mmHg\end{aligned}[/tex]
Therefore, the partial pressure of dihydrogen is 737.5 mmHg.
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Answer:
737.5Explanation:
Complete and balance the equation for the reaction of sodium with water.
Na+_H2O+ H2
2Na + 2H2O → 2NaOH + H2
The balanced equation
What is meant by the phrase “a consistent method of measurement"?
A. Things are measured the same way each time.
B. All measurements are in Sl units.
C. Every measurement is exactly the same numerical value.
D. The same person performs all measurements.
Answer:
A. Things are measured the same way each time.
Explanation:
Complete and balance the following half-reaction in acidic solution mno4 ---> mno2
The completely balanced reaction of the half-reaction in acidic solution is ; MnO₄⁻ (aq) + 3e⁻ + 4H⁺ ------> MnO₂(s) + 2H₂O(l)
Given data :
The half-reaction in acidic solution
MnO₄⁻ (aq) --> MnO₂(s)
Complete and balance the Half-reactionDetermine the oxidation number on both sides
Oxidation number of Mn in MnO₄⁻ = +7
Oxidation number of Mn in MnO₂ = +4
First step : Balance the oxidation number
MnO₄⁻ (aq) + 3e⁻ ------ > MnO₂(s)
Next step : Balance the charge in the reaction
MnO₄⁻ (aq) + 3e⁻ + 4H⁺ ------> MnO₂(s)
Final step : Completely balance the half reaction
MnO₄⁻ (aq) + 3e⁻ + 4H⁺ ------> MnO₂(s) + 2H₂O(l)
Hence we can conclude that The completely balanced reaction is :
MnO₄⁻ (aq) + 3e⁻ + 4H⁺ ------> MnO₂(s) + 2H₂O(l)
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Write a full note on Infectious diseases. please I need it now and no links please thanks
Answer:
diseases where microbes are the immediate cause are called infectious diseases. Infectious diseases are disorders caused by organisms — such as bacteria, viruses, fungi or parasites. Many organisms live in and on our bodies. They're normally harmless or even helpful.
How many liters of carbon gas are in 13.7 moles of carbon dioxide gas at STP?
At STP
1 mol weighs 22.4LNo of moles=13.7mol
Total volume:-
13.7(22.4)306.88L[/tex]The volume of gas occupied by 13.7 moles at STP is 306.88L.
What is STP?
STP stands for standard temperature and pressure. STP refers to a specific pressure and temperature used to report on the properties of matter.
According to IUPAC( International Union of Pure and Applied Chemistry), it is defined as -
Temperature of 0 degree celsius (273K)Pressure of 1 atmIt is generally needed to test and compare physical and chemical processes where temperature and pressure plays an important role as they keep on varying from one place to another.
One mole of a gas under STP conditions occupies a volume of 22.4L.
Given,
Moles of carbon dioxide gas = 13.7 moles
We know that,
1 mole of a gas occupies 22.4 L of volume at STP.
Thus, 13.7 moles will occupy 13.7 × 22.4 L
= 306.88 L
Therefore, the volume of gas occupied at STP is 306.88L.
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What impact will sea level rise have on farming and water supply?
I
Even a small increase can have devastating effects on coastal habitats farther inland, it can cause destructive erosion, wetland flooding, aquifer and agricultural soil contamination with salt, and lost habitat for fish, birds, and plants.
Explanation:
I hope this helps
How many grams of bicarbonate will produce 40. Ml of co2 gas?
The reaction equation must first be put down and the stiochiometry is used to calculate the mass of the bicarbonate produced as 0.11 g.
What is a reaction?A reaction refers to the transformation of reactants into products. We have the equation of this reaction as;
CO2 + H2O ---->H2CO3
If 1 mole of CO2 gas occupies 22400mL
x moles of CO2 occupies 40 mL
x = 0.0018 moles
If 1 mole of CO2 yields 1 mole of bicarbonate
0.0018 moles yields 0.0018 moles of bicarbonate
Mass of bicarbonate = 0.0018 moles * 61 g/mol = 0.11 g
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A neutralization reaction between HCl and NaOH has taken place in the lab, below is the data. Please determine the concentration of the unknown HCl solution. Please make sure all final answers are written using the correct number of significant figures and using scientific notation.
1 HCl + 1 NaOH 1 H2O + 1 NaCl
Molarity of NaOH = 1.00 M
What is the change in volume of NaOH?
From the table showing the data involving the neutralization reaction between HCl and NaOH, the concentration of the HCl solution would be 0.864 M
Titration calculationFrom the available data:
Volume of acid used = 0.0351 - 0.0131 = 0.022 L
Volume of base used = 0.0575 - 0.0385 = 0.019 L
Concentration of base = 1.00 M
Number of moles of acid and base = 1
Using the equation: CaVa/CbVb = Na/Nb = 1
Ca = 1x0.019/0.022 = 0.864 M
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What term describes a solution in which the dissolved solute is in equilibrium with the undissolved solute?
Saturated solution refer to a solution in which the dissolved solute is in equilibrium with the undissolved solute.
What is a saturated solution?A saturated solution is a chemical solution that contain maximum amount of a solute which is dissolved in the solvent. The addition of anotheg solute will not dissolve in a saturated solution. The amount of solute that can be dissolved in a solvent to form a saturated solution depends on a variety of factors.
Therefore, Saturated solution refer to a solution in which the dissolved solute is in equilibrium with the undissolved solute
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The term that describes a solution in which the dissolved solute is in equilibrium with the undissolved solute is saturated solution.
What is a saturated solution?A saturated solution is one in which there is so much solute that it would not dissolve if there was anymore.
When a saturated solution comes into contact with more solute, the extra solute does not dissolve or deposit.
Thus, the term that describes a solution in which the dissolved solute is in equilibrium with the undissolved solute is saturated solution.
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Which bonds are formed when elements share electrons and form molecules?.
Answer:
A covalent bond
Explanation:
the atoms bond by sharing electrons. Covalent bonds usually occur between nonmetals. For example, in water (H2O) each hydrogen (H) and oxygen (O) share a pair of electrons to make a molecule of two hydrogen atoms single bonded to a single oxygen atom.
what is the valency and symbol of chromium ?
Answer:
two valence states: trivalent chromium (Cr III) and hexavalent chromium (Cr VI)
hope this helps, i can change it if it doesn't.