Answer:
The number of carbon atoms is twice the number of magnesium atoms
Use the bond energy to calculate an approximate value of δh for the following reaction. Which is the more stable form of fno2?
The enthalpy of reaction or ∆H reaction is the difference between the bond energy of the reactants and the bond energy of the products.
What is ∆H reaction?The term ∆H reaction refers to the heat that is evolved or absorbed in a chemical reaction. It is also known as the enthalpy of reaction.
The question is incoherent but I will try to answer as much as possible. Using the values of bond energy, ∆H reaction = Bond energy of reactants - bond energy of products. This will give us the enthalpy of reaction.
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7.
Which substance, if added to a saturated solution of
NH4OH, would cause the pH of the solution to increase?
A. HCI
B. NH4C1
C. LiOH
D. CH3OH
Answer:
C LiOH
Explanation:
because it is an hydroxide as well as it is alkaline
Answer:
C. LiOH
Explanation:
LiOH is a strong base while the others are acids
can someone pls help me
Answer:
the picture is blurd
Explanation:
Which mineral reacts readily with cool, dilute hydrochloric acid to produce visible bubbles of carbon dioxide gas?.
Answer:
The acid reacts with the mineral to release CO2 gas that is bound into the crystal as carbonate ion.
Explanation: i got it corrcet
A chemistry teacher adds 50. 0 mL of 1. 50 M H2SO4 solution to 200 mL of water. What is the concentration of the final solution? Use M subscript i V subscript i equals M subscript f V subscript f. 0. 300 M 0. 375 M 6. 00 M 7. 50 M.
The concentration of the final solution after mixing water into the H₂SO₄ is 0.375 M.
How do we calculate the concentration?Concentration in terms of molarity will be calculated by using the below formula as:
M₁V₁ = M₂V₂, where
M₁ = molarity of H₂SO₄ = 1.50 M
V₁ = volume of H₂SO₄ = 50 mL
M₂ = molarity of water = ?
V₂ = volume of water = 200 mL
On putting all values on the above equation, we get
M₂ = (1.50)(50) / (200) = 0.375 M
Hence option (2) is correct.
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Balance the chemical equation
Explanation:
please mark me as brainlest
Name two elements that are extracted from
their compounds by electrolysis.
Answer:
Hydrogen and oxygen
Explanation:
This is the most common compound water
When water goes through electrolysis it produces two elementsH_2 and O_2The reaction is given by
H_2O-->H_2+O_2Answer:
Hydrogen and helium is the answer
The number of protons and neutrons in an atom is that atoms __ number.
If the density of lead is 11.34g/.what is the density in kg/l
Answer:
0.01134kg
Explanation:
You divide by 1000 to get the kg
Hello people ~
CO2 extinguishers help extinguish fires by –
A. Cutting supply of nitrogen.
B. Limiting the supply of fuel.
C. Reducing the heat of the surroundings.
D. Cutting the supply of oxygen
Answer:
Cutting the supply of oxygen
Explanation:
We know that a thing need three things to burn
Oxygen Heat flammable object .Co_2 stops oxygen supply so fire gets extinguished
What three things does force cause?
Forces can cause objects to accelerate , decelerate , stop , start moving , change direction , change shape , or even turn
On all aerosol cans you see a warning that tells you to keep the can
away from heat because of the danger of explosion. What is the
potential volume of the gas contained in a 500.0 mL can at 25°C if it
were heated to 54°C. In other words if the can could expand to allow
the gas to take up a greater volume, what would be the new volume of
the gas when heated as previously described?
Gas laws show the relationship between tempertaure, pressure, volume, volume and number of moles. The new volume of the gas is 549 mL.
What is Charles law?Charles law states that, the volume of a given mass of gas is directly proportional to its temperature at constant pressure .
Given that;
V1 = 500.0 mL
T1 = 25°C or 298 K
V2 = ?
T2 = 54°C + 273 = 327 K
Since;
V1/T1 = V2/T2
V1T2 = V2T1
V2 = V1T2/T1
V2= 500.0 mL * 327 K/298 K
V2 = 549 mL
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HELP1!!!!!!!!!!!!!!!!!!!!!!!!!!!111
Answer:
I believe c
Explanation:
For 480. 0 mL m L of pure water, calculate the initial pH p H and the final pH p H after adding 2. 0×10−2 mol m o l of HCl H C l
Given that the volume of the pure water is 480 mL and the mole of HCl added to the water is 2×10¯² mole. Therefore, the Initial and final pH of the water are:
1. The initial pH of the pure water is 7
2. The final pH of the water is 1.38
What is pH ?This is simply a measure of the acidity / alkalinity of a solution.
The pH measures the hydrogen ion concentration while the pOH measures the hydroxide ion concentration
pH scaleThe pH scale is a scale that gives an understanding of the variation of the acidity / alkalinity of a solution.
The scale ranges from 0 to 14 indicating:
0 to 6 indicates acid 7 indicates neutral (pure water) 8 to 14 indicate basicHow to determine the molarity Volume = 480 mL = 480 / 1000 = 0.48 L Mole of HCl = 2×10¯² mole Molarity =?Molarity = mole / Volume
Molarity = 2×10¯² / 0.48
Molarity = 4.17×10¯² M
Dissociation equationHCl(aq) —> H⁺(aq) + Cl¯(aq)
From the balanced equation above,
1 mole of HCl contains 1 mole of H⁺
Therefore,
4.17×10¯² M HCl will also contain 4.17×10¯² M H⁺
How to determine the pH Hydrogen ion concentration [H⁺] = 4.17×10¯² MpH =?pH = –Log H⁺
pH = –Log 4.17×10¯²
pH = 1.38
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Briefly explain the two ways Avogadro's number was calculated.
The value of Avogadro's number was obtained by dividing the charge of a mole of electrons by the charge of a single electron which is equal to 6.02214154 x 1023 particles per mole.
The most common used way is
n=Charge of one mole of atom /charge of one single atomThere can be another derived way
No of molecules=No of moles ×Avagadro noAvagadro no=No of molecules/No of molesWhich 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.
Why do we balance chemichal reactions
Answer:
We balance chemical equations due to the law of conservation of mass, which states that mass can neither be created or destroyed. Therefore, in a chemical reaction, the total mass of the reactants must be equal to the total mass of the products. Balancing equations accounts for the total mass of the reactants and the total mass of the products.
Explanation:
We balance chemical equations due to the law of conservation of mass, which states that mass can neither be created or destroyed. Therefore, in a chemical reaction, the total mass of the reactants must be equal to the total mass of the products. Balancing equations accounts for the total mass of the reactants and the total mass of the products.
Answer:
to satisfy the law of conservation of matter.
the law of conservation states that matter can not be created nor destroyed.
Freon-12 synthesized by the reaction between fluoride at carbon tetrachloride and antimony(III)Suppose 5.0 mol of antimony (III) fluoride is added to 10.0 mol of carbon tetrachloride: How many moles each compound (CCL; SbF;, CClFz, and SbCI3) are there if the reaction is |00% complete
Suppose 5.0 mol of antimony (III) fluoride is added to 10.0 mol of carbon tetrachloride, and from the 100% reaction there are the equivalents of 0 moles of SbF₃, 5.0 moles of SbCl₃, 0 moles of CCl₄, and 15.0 moles of CClF₂.
What is the significance of the balanced reaction?A balanced reaction is one where the reactants and products are present in equal amounts, and if the 100% reaction takes place, then the reactant sides have 1 mol of SbF₃ and 3 mol of CCl₄ that make the product of 1 mol of SbCl₃ and 3 mol of CClF₂. After the 100% reaction, all the reactants get converted into the product. The complete reaction is the below.
SbF₃ + 3CCl₄ → SbCl₃ + 3CClF₂
Hence, suppose 5.0 mol of antimony (III) fluoride is added to 10.0 mol of carbon tetrachloride, and from the 100% reaction there are the equivalents of 0 moles of SbF₃, 5.0 moles of SbCl₃, 0 moles of CCl₄, and 15.0 moles of CClF₂.
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Sample data from titration lab:
Amount of analyte; (HCI): 19.54 mL
Amount of titrant: (NaOH): 12.33mL
Molar concentration of NaOH: 0.5 mol
The molarity of the HCl would be:
VM
The numbers I used are probably wrong
Based on the volumes of HCl and NaOH reacted, the molarity of HCl is 0.3 M
What a titration?A titration is a process in volumetric analysis in which the given volume of a substance of known concentration reacting with a volume another solution of unknown concentration is used to determine the unknown concentration of another solution
In the titration given, an unknown concentration of HCl reacts with 0.5 M NaOH solution.
The equation of the reaction is given below:
HCl + NaOH -----> NaCl + H2OAt equivalence point, 1 mole of HCl reacts with 1 moles of NaOH
moles of NaOH = 12.33 × 0.5 = 6.165 moles
moles of HCl = 19.54 × M
From above, moles of HCl = 6.165 moles
Molarity of HCl, M = 6.165/19.54
Molarity of HCl = 0.3 M
Therefore, the molarity of HCl is 0.3 M
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Answer:
0.317
Explanation:
right on edge
what are the properties of aluminium and their use
Answer: Answers are in bulleted lists.
Explanation: Aluminum...
has a low densityis non-toxichas a high thermal conductivityhas excellent corrosion resistancecan be easily cast, whether it's machined or formed.Uses:
Aeroplane PartsCansWindow framesBeer kegsFoils Kitchen utensilsHave a great day! :)
Answer these for 40ps
Answer:
7. H
8. F
9. G.
10. D
11. A
12. E
13. B
14. C
All of the following are true about scientific theories, except:
O A theory is an explanation of why
something happens.
O Theories must have been extensively
tested.
O A theory can be the result of one
scientific investigation.
O Theories are based on many
observations.
Describe the patterns that can be observed for elements on a Periodic table.
Answer:
mark brainliestbrainliestbrainliest.
Explanation:
The periodic table is an arrangement of the elements in order of increasing atomic number. Elements that exhibit similar chemistry appear in vertical columns called groups (numbered 1–18 from left to right); the seven horizontal rows are called periods.
How many moles of O2 are required for the complete reaction of 1.60 moles of C2H4 to form CO2 and H2O? Use the balanced equation: C2H4 + 3O2 --> 2CO2 + 2H2O
113 mol
4.80 mol
48.0 mol
0.64 mol
Answer:
4.80 mol is the answer
Explanation:
please mark me as brainlist..
4.8 moles
Balanced equation: C₂H₄ + 3O₂ --> 2CO₂ + 2H₂O
C₂H₄ : 1.60 molesuse molar ratio:
3O₂ : C₂H₄
3 : 1
moles of O₂ : 3 * 1.6 = 4.8 moles
(a) what is the approximate ductility (%el) of a brass that has a yield strength of 230 mpa (33360 psi)?
Based on the calculations, the approximate ductility (%el) of this brass is equal to 2.3%.
Given the following data:
Yield strength = 230 mpa (33360 psi).What is ductility?Ductility can be defined as an important property of a material which determines its ability to become elongated due to the application of stress.
Mathematically, the ductility of a material can be expressed as percentage elongation in length:
[tex]\% el = \frac{\Delta L}{L_i} =\frac{L_f - L_i}{L_i}[/tex]
Where:
[tex]L_i[/tex] is the original length.[tex]L_f[/tex] is the final length.[tex]\Delta L[/tex] is the yield strength.For this exercise, let us assume the original length of this brass is equal to 100 meters.
Substituting the parameters into the formula, we have;
[tex]\% el = \frac{230}{100}[/tex]
Ductility = 2.3%.
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The approximate ductility (%el) of a brass that has a yield strength of 230 mpa is 2.3%.
How do we calculate the approximate ductility?Approximate ductility of any substance will be calculated by using the below equation as:
%el = ΔL / L₁, where
ΔL = yield strength = 230 MPaL₁ = initial length = 100 MPa (assume)On putting this values, we get
%el = 230/100 = 2.3%
Hence 2.3% is the approximate ductility.
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Which of these describes an ethical dilemma that drug designers could face?
a. whether people should take medicine or if instead they should
seek alternative treatments.
b. a drug lowers blood pressure but can cause severe coughing
spells.
c. a new drug is effective in preventing cancer cells from
reproducing
o d. a drug for blood pressure is absorbed in the colon. it is effective,
but occasionally it can erode the colon walls.
The statement 'whether people should take medicine or if they should seek alternative treatments' describes an ethical dilemma that drug designers face.
What is drug development?Drug development refers to all the processes from target drug identification to drug validation and commercialization.
Drug development involves different stages of development including preclinical and clinical trials.
Ethical dilemmas in drug development include the release of a drug that is ineffective when compared to parallel treatments.
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Answer:
A drug for blood pressure is absorbed in the colon. It is effective, but occasionally it can erode the colon walls.
Explanation:
i just took the test and got it right.... i hope this helps :)
Please help-
Answer:
you are not posted question
Which step accurately describes how to measure the final burette volume? Locate the bottom of the meniscus and record volume to the nearest 0. 01 mL. Locate the bottom of the meniscus and record volume to the nearest 0. 1 mL. Locate the top of the meniscus and record volume to the nearest 0. 01 mL. Locate the top of the meniscus and record volume to the nearest 0. 1 mL.
Burette is the lab equipment used to estimate the volume of liquid during titration. The volume is measured by the bottom meniscus to the nearest 0.01 mL.
What is a burette?Burette is an instrument used in quantitative analysis like the volume of the sample in the titration methods and is made of a glass tube.
In the volumetric analysis, the final volume of the liquid is measured by locating the lower meniscus and is taken approximately near 0.01 ml as the burettes have markings of 0.1 mL.
Therefore, option a. locate the bottom meniscus and mark nearest to 0.01 mL.
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Describe how you use two living and two nonliving natural resources every day.
Answer:
Well, if you live on a farm, you have to feed the living animals and when you eat, you use a fork, knife, napkin, chair and those are all nonliving.
Explanation:
Also, if your trying to go on a scavanger hunt, and you pick up an animal then you are interacting with a living resource. Also water can be counted as both because water isnt alive but it can be used on living things. like if you were to drink it or water the plants.
Answer:
I use plant and dog as living things and mobile and dish as non living things everyday.
Explanation:
I use plants to get oxygen, vegetables and herbs and dog to help me to protect my home everyday. similarly, I use mobile to call others and I use dish to eat food everyday.
Part 1. determine the molar mass of a 0.458-gram sample of gas having a volume of 1.20 l at 287 k and 0.980 atm. show your work.
part 2. if this sample was placed under extreme pressure, describe how the actual volume would compare to the predicted volume. explain your answer.
The molar mass of a substance can be calculated by first calculating the number of moles using ideal gas law equation:
PV = nRT
Where;
P = pressureV = volumeT = temperatureR = gas law constantn = no of moles0.98 × 1.2 = n × 0.0821 × 287
1.18 = 23.56n
n = 1.18/23.56
n = 0.05moles
mole = mass/molar mass
0.05 = 0.458/mm
molar mass = 0.458/0.05
molar mass = 9.15g/mol
Therefore, the molar mass of 0.458-gram sample of gas having a volume of 1.20 l at 287 k and 0.980 atm is 9.15g/molIf this sample was placed under extreme pressure, the volume of the sample will decrease.Learn more about gas law at: https://brainly.com/question/12667831