Answer:
A solution in which the maximum amount of solvent has been dissolved. Any more solute added will sit as crystals on the bottom of the container.
Explanation:
A is a solution containing 3.5g of HX per dm-³. B is a solution containing 0.050moldm-³ of an hydrous sodium trioxocarbonate (IV) of solution 25cm³ portions of solution B required an average of 26.10cm³ of Solution A for complete neutralization. From this results, calculate
1. The Molar Concentration Of A
2. The Relative Molar Mass Of A
Equation For The Reaction 2HX + Na2CO3 ---> 2NaX + H2O + CO2
Brainliest!!
The Molar Concentration Of A =0.099 .
The Relative Molar Mass Of A = 35.0129 gm
Given,
Mass of HX = 3.5 g
Moles of solution B ([tex]Na_{2} CO_{3}[/tex]) = 0.05 moles
Volume of HX = 26.10 mL
Volume of Solution B = 25 mL
Molecular weight of solution B = 2(atomic weight of Na )+ atomic weight of C + 3(atomic weight of O)
= 2(23) + 12 + 3(16)
=106 gm
Equivalent weight of [tex]Na_{2} CO_{3}[/tex] = molecular weight / 2 = 106 /2 =53 g
Mole = mass / molecular weight
∴0.05 = mass / 106
∴ mass = 5.3 gm [tex]Na_{2} CO_{3}[/tex]
Normality = mass ÷ (equivalent weight × volume of the solution in liter)
= 5.3 ÷( 53 × 0.025)
=4 N
So, by using formula ,
[tex]N_{1} V_{1} =N_{2} V_{2}[/tex]
[tex]N_{1}[/tex] = normality of solution B = 4 N
[tex]V_{1}[/tex] = volume of solution B = 25 mL
[tex]N_{2}[/tex] = normality of solution A = ? N
[tex]V_{2}[/tex] =Volume of solution A = 26.1 mL
∴ 4×25 = [tex]N_{2}[/tex] × 26.1
∴[tex]N_{2}[/tex] = 3.83 N
∴ normality of solution A = 3.83 N
from Formula of the normality we can find the equivalent weight of the A
Normality = mass of HX ÷ (equivalent weight × volume of the solution in liter)
3.83 = 3.5 ÷( equivalent weight × 0.0261)
∴equivalent weight = 35.0129 g
In case of HX the electron transfer is 1 ,so equivalent weight = molecular weight ; which is also termed as relative molar mass in given case.
∴The Relative Molar Mass Of A = 35.0129 g
Molar concentration = mass / molar mass
= 3.5 / 35.0129
= 0.099 mole
∴ The Molar Concentration of A is 0.099 .
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Phase change involves changing states of matter (solid-liquid-gas). How do these three states of matter differ from each other? (on a molecular level)
solid : the molecules are tightly packed
liquid : the molecules have some space in them
gas : molecules can freely move around
60 ml of a 1.0 m solution of h2so4 is mixed with distilled water to make 1 l of solution. what is the molarity
Answer:
0.057 M
Explanation:
To find the new molarity, you need to (1) find the moles (via the molarity equation using the old molarity and volume) and then (2) calculate the new molarity (via the molarity equation using the combined volume and old moles).
(Step 1)
60 mL / 1,000 = 0.06 L
Molarity (M) = moles / volume (L)
1.0 M = moles / 0.06 L
(1.0 M) x (0.06 L) = moles
0.06 = moles
(Step 2)
0.06 L + 1 L = 1.06 L
Molarity (M) = moles / volume (L)
Molarity = 0.06 moles / 1.06 L
Molarity = 0.057 M
What is a spring tide? When and why does it occur?
A spring tide occurs when there is a new or full moon in the solar system.
What is Spring tide?This is the type of tide which occurs when the sun, moon and earth are in line and occurs between three to four times per year.
Lunar and solar tides also line up and reinforce each other to produce this type of tide.
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HELP FAST!!!!!!!
Which two groups have the same functional group?
O A. Amines and alcohols
B. Aldehydes and esters
C. Ketones and aldehydes
D. Esters and ethers
Answer:
C. Ketones and aldehydes
Explanation:
they are both carbonyl functional group
they both have a carbon-oxygen double bond
testosterone is an example of a ketone
formaldehyde is an example of a aldehyde
opentextbcca
wikipedia
Answer:
Ketones and Aldehydes
Explanation:
i just took tha test
Which chemical name is correctly paired with the chemical formula?
tin(IV) bromide, SnBr4
aluminum fluorate, AlF3
iron(II) oxide, Fe2O3
potassium chloride, K2Cl2
Answer:
Tin bromine = Snbr2
aluminum fluorate = AlFe3
iron oxide = Fe2o3
potassium chloride = KCL or 2KCL = K2CL2
All Pairs are correct
An electrolytic cell differs from a voltaic cell because.
Considering the combustion reaction of propane again, what mass of propane (C3Hg) is necessary to react with 4.53 g of oxygen? C3H8 +5023CO₂ + 4H₂O 0.0256 g C3H8 1.13 g C3H8 1.25 g C3H8 2.50 g C3H8
Answer:
1.25 g C3H8
Explanation:
edge lol
What are the five (5) things that can indicate a chemical change has occurred?
Write out the combinations that indicate a chemical change, explain how you know.
Answer: Bubbles, burning, odor, color change, and rusting.
Explanation: Chemical changes are changes to something that is irreversible.
Determine if the following statement is true or false, and why. “A hypothesis can be proven true.”
A. False, it should read “A hypothesis can only be proven false.”
B. True
C. False, it should read “A hypothesis cannot be tested.”
D. False, it should read “A hypothesis can’t be proven true if it is falsifiable.”
it's true. answer is B.
a hypothesis is a stage before formation of theory. so when we put forward a hypothesis to prove something (in scientific observation) it can be proven true with the experiments conducted.
but of course it's can be proven wrong too, after the experiments conducted. then it is disregard.
a proven hypothesis (a true hypothesis)is the reason for theories.
Answer:
it's true. answer is B.
a hypothesis is a stage before formation of theory. so when we put forward a hypothesis to prove something (in scientific observation) it can be proven true with the experiments conducted.
but of course it's can be proven wrong too, after the experiments conducted. then it is disregard.
a proven hypothesis (a true hypothesis)is the reason for theories.
Explanation:
hope this helps :)
the volume of a 300 L sample of CO2(g) at 2.30 atm is compressed to 29.6 L, what
is the new pressure at constant temperature and moles?
Answer:
23,31 atm
Explanation:
p1v1 = p2v2
2.3 * 300 = p2 *29.6
p2=23.31 atm
A year has 365 day and a day has 24 hours. if an hour has 60 minutes and a minute has 60 seconds how many seconds are in a year
Answer:
31536000
Explanation:
There are 31536000 seconds in a day.
60s x 60min x 24hrs x 365 days = 31536000sec
Which phrase describes a homogeneous catalyst?
Answer:
It is in the same phase as the reactants.
Explanation:
i took the test
The integrating center for the negative feedback loop that regulates body temperature is the.
Answer: Hypothalamus
Explanation:
The hypothalamus controls body temperature by sending signals to muscles, organs, glands, and other components of the nervous system when it becomes too low or too high. These structures then help in returning the body temperature to normal.
The energy of a photon from certain wavelength is 1.37 x 10^-20 j, what is the frequency in hz?
Answer:
frequency = 2.07 x 10¹³ Hz
Explanation:
To find the frequency of the photon, you need to use the following equation:
E = hv
In this formula,
-----> E = energy (J)
-----> h = Planck's Constant (6.626 x 10⁻³⁴ J*s)
-----> v = frequency (Hz)
Since you have been given values for two of the variables (in the correct units), you can plug them into the equation and simplify to find the frequency.
E = hv <----- General Equation
E = (6.626 x 10⁻³⁴ J*s)v <---- Plug in Planck's Constant
1.37 x 10⁻²⁰ J = (6.626 x 10⁻³⁴ J*s)v <----- Plug in energy (given)
2.07 x 10¹³ = v <----- Divide both sides by 6.626 x 10⁻³⁴
PROBLEMS
1. What is the molarity of 4 grams of NaOH dissolved in 1 liter of solution?
2. What is the molarity of 4 grams of NaOH dissolved in 0.5 liter of solution
3. What is the molarity of 4 grams of NaOH dissolved in 0.1 liter of solution
4. Which of the 3 solutions above is more concentrated and why?
Answer:
1.) 0.1 M
2.) 0.2 M
3.) 1 M
4.) Solution #3 is the most concentrated because it has the highest molarity. This solution has the largest solute to solvent ratio. The more solvent there is, the lower the concentration and molarity.
Explanation:
To find the molarity, you need to (1) convert grams NaOH to moles (via molar mass from periodic table) and then (2) calculate the molarity (via the molarity equation). All of the answers should have 1 sig fig to match the given values.
Molar Mass (NaOH): 22.99 g/mol + 16.00 g/mol + 1.008 g/mol
Molar Mass (NaOH): 39.998 g/mol
4 grams NaOH 1 mole
---------------------- x ------------------ = 0.1 moles NaOH
39.998 g
1.)
Molarity = moles / volume (L)
Molarity = (0.1 moles) / (1 L)
Molarity = 0.1 M
2.)
Molarity = moles / volume (L)
Molarity = (0.1 moles) / (0.5 L)
Molarity = 0.2 M
3.)
Molarity = moles / volume (L)
Molarity = (0.1 moles) / (0.1 L)
Molarity = 1 M
Which term describes this reaction?
Answer:
addition polymerization
Explanation:
What is the theoretical yield of NaBr
when 2.36 moles of FeBr3 reacts?
2FeBr3 + 3Na2S → Fе₂S3 + 6NaBr
[?] mol NaBr
Round your answer to the hundredths place
The theoretical yield of NaBr given that 2.36 moles of FeBr₃ reacts is 7.08 moles
Balanced equation2FeBr₃ + 3Na₂S → Fе₂S₃ + 6NaBr
From the balanced equation above,
2 moles FeBr₃ reacted to produce 6 moles of NaBr
How to determine the theoretical yield of NaBrFrom the balanced equation above,
2 moles FeBr₃ reacted to produce 6 moles of NaBr
Therefore,
2.36 moles FeBr₃ will react to produce = (2.36 × 6) / 2 = 7.08 moles of NaBr
Therefore,
Thus, the theoretical yield of NaBr is 7.08 moles
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Answer:
7.08
Explanation:
What happens if you keep thermometer in deep freezer? Why?
Answer:
Nothing will happen until you remove the thermometer.
Explanation:If the thermometer is made of mercury in glass, nothing will happen….mercury does not freeze at the temperatures in the refrigerator…
helpp im timed Part A
Fill a clear glass or resealable plastic bag three-fourths full with water. Place the pencil in the water, and hold it vertically without spilling. Look at the pencil from the side. Describe what you see.
Part B
Tilt the pencil from side to side while continuing to look at it from the side. Describe what you see.
Any deviation in the image of an object when light passing from one medium to other is assciated to the phenomenon of refraction.
What is refraction ?
It is the deflection from a straight path undergone by a light ray while passing from one medium (such as air) into another (such as glass) in which its velocity is different.
Basically, the light refraction gives the pencil a slight magnifying effect, which makes the angle appear bigger than it actually is, causing the pencil to look crooked.
When the pencil tilt from side to side, It looks so dramatically broken on looking at it from different angles.
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Answer:
Explanation:
Any deviation in the image of an object when light passing from one medium to other is assciated to the phenomenon of refraction.
What is refraction ?
It is the deflection from a straight path undergone by a light ray while passing from one medium (such as air) into another (such as glass) in which its velocity is different.
Basically, the light refraction gives the pencil a slight magnifying effect, which makes the angle appear bigger than it actually is, causing the pencil to look crooked.
After Looking at the pencil from the side of a clear glass or resealable plastic bag filled three-fourths with water, we will see the light bends around the pencil, causing it to look bent in the water.
When the pencil tilt from side to side, It looks so dramatically broken on looking at it from different angles.
We can magically “fix” the broken pencil by changing where the pencil is positioned in the glass.
What is the weighted average of a
bean in the sample data given?
Sample Number
of Beans
Black
Eyed Peas
Cannellini
Beans
410
90
Abundance Mass
(%)
(g)
1.32
82
18
2.94
Weighted
Average (g)
[?]
Answer: 1.6116
Explanation:
[tex](1.32)(0.82)+(2.94)(0.18)=\boxed{1.6116}[/tex]
The weighted average of a bean in the given sample data is equal to 1.6116 g.
What is the Weighted Average?The weighted average can be described as a calculation that takes into account the varying degrees of importance of the numbers in a data set. Each number is multiplied by a predetermined weight in the given data set before the final calculation is made in calculating a weighted average.
A weighted average assigns weights that calculate in advance the relative abundance of each data point. A weighted average is commonly determined to equalize the frequency of the values in a data set.
Given the abundance of Black eyes peas, m₁ = 82% = 0.82
The mass of the Black eyes peas, W₁ = 1.32 g
the abundance of cannellini beans, m₂ = 18% 0.18
The mass of cannellini beans, W₂ = 2.94 g
The weighted average = m₁W₁ + m₂W₂ = 1.32× 0.82 + 2.94 ×0.18
The weighted average of a bean = 1.6116 g
Therefore, the weighted average of a bean in the sample is 1.6116 g.
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Please help asap! giving brainliest to correct answer!!
which pair of compounds has the same empirical formula? (5 points)
select one:
a. c3h8 and c3h
b. c2h2 and c2h
c. c4h10 and c6h
d. c4h10 and c2h5
Answer:
D. C₄H₁₀ and C₂H₅
What is a empirical formula?
A chemical formula indicating the elements of a compound and their relative proportions, as (CH₂O)n.
Since an empirical formula indicates the ratio (proportions) of the elements in the compound, it can be used, along with the molar weight of the compound, to determine the molecular formula.
The empirical formula provides the smallest whole-number ratio among elements or compounds within a molecular compound. A compound is a chemical formed from atoms of different chemical elements.
Hence, Option D is correct.
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Help pls!!
The table compares the number of electrons in two unknown neutral atoms.
Comparison of Electrons
Atom Number of Electrons
A 10
D 11
Use this information to determine the number of valence electrons in the atoms. Which of the following correctly compares the stability of the two atoms?
A Both are unreactive.
B Both are highly reactive.
C A is unreactive and D is reactive.
D A is reactive and D is unreactive.
Answer: A is unreactive and D is reactive.
Explanation:
A is neon, which is a noble gas, and thus unreactive.
D is sodium, which is an alkali metal, and thus highly reactive.
How many miles of silver will be generated if 1.30 miles of zinc is placed into silver nitrate solution
2.60 moles.
Zn (s) + 2 Ag+ (aq) --> 2 Ag (s) + Zn2+ (aq), each mole of zinc gives out two moles of silver. Therefore, 1.30 moles of zinc will displace 2.60 moles of silver. ( 1.30 × 2)
More about silver nitrate:
An inorganic substance with the chemical formula AgNO3 is silver nitrate. This salt serves as a flexible base for numerous different silver compounds, including those employed in photography. Compared to halides, it is far less light-sensitive. Lunar caustic was previously the name given to it since early alchemists referred to silver as luna and connected it to the moon.
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NiSe2 + Ca3(PO4)2 = Ni3(PO4)2 + CaSe
balance please
In photosynthesis, plants use energy from the sun to produce glucose, c6h12o6 , and oxygen from the reaction of carbon dioxide and water.
6co2 + 6h2o --> c6h12o6 + 6o2
what mass, in grams, of glucose is produced when 3.00 mol of water react with carbon dioxide?
Answer: 324 g (to 3 sf)
Explanation:
Based on the coefficients of the equation, we know that when 3.00 mol of water is consumed, 3.00 mol of carbon dioxide is also consumed.
The atomic mass of carbon is 12.011 g/mol.The atomic mass of oxygen is 15.9994 g/mol.Thus, the formula mass of carbon dioxide is:
[tex]6(15.9994)+12.011=108.0074[/tex] g/mol.
Thus, 3.00 mol has a mass of (108.0074)(3.00)=324 g (to 3 sf)
How many grams of butane were in 1. 000 atm of gas at room temperature?
The mass in grams of butane at standard room temperature is 53.21 grams.
How can we determine the mass of an organic substance at room temperature?The gram of an organic substance at room temperature can be determined by using the ideal gas equation which can be expressed as:
PV = nRT
1 × 22.4 L = n × (0.0821 atm*L/mol*K× 298 K)
n = 22.4/24.4658 moles
n = 0.91556 moles
Recall that:
number of moles = mass(in grams)/molar massmass of butane = 0.91556 moles × 58.12 g/mole
mass of butane = 53.21 grams
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Which of the following questions would be answered by performing a scientific experiment?
A.
What type of food is the most enjoyable?
B.
What type of food is the most nutritious?
C.
What type of food looks the best?
Oxygen forms a number of compounds with sulfur, many of which are quite reactive. One such compound is 57.20 % by mass S . Calculate the number of grams of oxygen present in a sample of this compound that contains 40.00 grams of S . g O
The number of grams of oxygen present in a sample of this compound that contains 40.00 grams of S = 29.9g of oxygen
Calculation of quantity of OxygenThe compound contains the following:
sulphur = 57.20%
Oxygen= 100 - 57.20 = 42.80%
If 57.20% of the sample contains 40g of sulphur then 42.80% of the sample will contain X.
Make X the subject of formula,
X = 42.8 × 40/57.20
X= 1712/57.20
X= 29.9g of oxygen
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How many moles of propane
react when 294 g of CO2 form?
C3H8 +502 3CO2 + 4H₂O
?] mol C3H8
