1129.9 grams of rock salt, NaCl needs to be added to a 3.78 kg of ice, to get the temperature to drop to -19C .
What is freezing point depression?Freezing point depression refers to a property of solutions where addition of a solute lowers the normal freezing point of the solvent.
The Blagden's Law given as the equation above is used to determine the freezing point depression of ice:
[tex]ΔT = iK_fm[/tex]where;
ΔT = Change in temperature in °Ci = van 't Hoff factorKf = molal freezing point depression constantm = molality of the solute in mol solute/kg solvent.For NaCl, i = 2
Kf for water/ice = 1.86 °C kg/mol
molalityof NaCl = (mass/molar mass
l)/kg of ice
mass of NaCl = molality × mass of ice × molar massmolar mass of NaCl = 58.5
mass of ice = 3.78 kg
Let molality of NaCl = m
ΔT = 19 °C
Substituting the values:
19 = 2 x 1.86 °C kg/mol x m
m = 5.11 mol/kg
mass of NaCl = 5.11 × 3.78 × 58.5
mass of NaCl = 1129.9 g
Therefore, the mass in grams of rock salt, NaCl that needs to be added to a 3.78 kg of ice, to get the temperature to drop to -19C is 1129.9 g
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The correct IUPAC name for 2-isopropylbutane is: a) 2-ethylpentane b) 2,3-dimethylpentane c) 2-methylhexane d) 3-methylhexane
Answer:
a
Explanation:
On drawing the structure, the most Carbon atoms in a row is 5
⇒ pentaneThe remaining two carbon atoms are connected to the 2nd carbon atom
2-ethylIUPAC name is :
2-ethyl + pentane2-ethylpentaneWhat is the volume of hydrogen chloride under normal conditions, if its mass is 73 g?
Explanation:
36.5 g of HCl occupies 2.24×10-2m3 . ∴ 73 g of HCI at STP will occupy 2.24×10-236.5×732=4.48×10-2m3.
During photosynthesis, a green plant produces 122 mL of oxygen gas at STP. What mass of glucose
(C6H12O6) is produced during this reaction?
6CO2+ 6H2O > C6H12O6+ 602
Show all steps (Answer: 0.164g)
Answer:
About 0.164 g of glucose.
Explanation:
We can determine the mass of glucose produced given the volume of oxygen gas produced with stoichiometry.
Recall that at STP, a mole of any gas occupies a volume of 22.4 L.
From the reaction, six moles of oxygen gas is produced for every one mole of glucose.
Lastly, the molecular weight of glucose is 180.18 g/mol.
Therefore:
[tex]\displaystyle \begin{aligned} 122\text{ mL O$_2$} & \cdot \frac{1\text{ L O$_2$}}{1000\text{ mL O$_2$}}\cdot \frac{1\text{ mol O$_2$}}{22.4\text{ L O$_2$}} \cdot \frac{1\text{ mol C$_6$H$_{12}$O$_6$}}{6\text{ mol O$_2$}} \cdot \frac{180.18\text{ g C$_6$H$_{12}$O$_6$}}{1\text{ mol C$_6$H$_{12}$O$_6$}} \\ \\ & = 0.164\text{ g C$_6$H$_{12}$O$_6$}} \end{aligned}[/tex]
Therefore, about 0.164 g of glucose is produced.
Becquerel placed photographic paper in a drawer with some radioactive rocks and discovered that the amount of exposure on the paper was proportional to the amount of uranium that was present in the rocks. True False
Becquerel did not discover that the amount of exposure on the paper was proportional to the amount of uranium that was present in the rocks
What is radioactivity?The phenomenon of radioactivity was discovered by the French scientist Henri Becquerel in 1896 when he placed photographic paper in a drawer with some radioactive rocks.
We have to note that Becquerel did not discover that the amount of exposure on the paper was proportional to the amount of uranium that was present in the rocks hence the stetement is false.
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The partial pressures of gases A, B, and C in a mixture are
0.75 atmosphere, 0.25 atmosphere, and 1.25 atmospheres,
respectively. What is the total pressure of the gas mixture
in millimeters of Hg?
A. 1710 mm of Hg
B.
1140 mm of Hg
C. 760.0 mm of Hg
D. 570.0 mm of Hg
Answer:
A
Explanation:
.75 + .25 + 1.25 = 2.25 atm
1 atm is 760 mm hg
2.25 * 760 = 1710 mm HG
Answer:
[tex]\huge\boxed{\sf 2.25\ atm = 1710\ mm\ of\ Hg}[/tex]
Explanation:
Partial pressure of gas A = 0.75 atm
Partial pressure of gas B = 0.25 atm
Partial pressure of gas C = 1.25 atm
Total partial pressure = 0.75 atm + 0.25 atm + 1.25 atm
= 2.25 atm
We know that:
1 atm = 760 mm of Hg
Multiply 2.25 to both sides
2.25 atm = 760 × 2.25 mm of Hg
2.25 atm = 1710 mm of Hg
[tex]\rule[225]{225}{2}[/tex]
When liquids of a ph 5 and ph 2 mixed together, gives what ph value
Answer:
By mixing two solutions of differing pH values, the final pH of the mixed solution is going to be a function of the pH-, or the hydrogen ion (H+), of the lower pH solution, and the final volume. The hydrogen ion(H+) of the higher pH solution has little to no effect in the final pH value.
5. Which equation represents a balanced chemical equation?
O CF4 + 2Br2 → CBr4 + 2F2
O N2 + 3F2 + NF3
OPA+ O2 + 2P203
O K+ Cl2 + 2KCI
Answer:
Cf4 + 2Br2 gives CBr4 +2F2
Explanation:
b/c there are balanced
How can Climate Change impact the formation of Hurricanes?
I will give brainlist
Which of the following is an example of the organic portion of the Earth’s outer layers?
Oxides
Coal
Sulfides
Carbonates
Answer:
Coal
Explanation:
Coal is derived from ancient plant life and thus consists largely of organic compounds.
The example of the organic portion of the Earth’s outer layers is coal.
What are the layers of earth?The earth is made up of many layer which are very important for human life and our planet earth.
The earth is basically made up of three different layers.
Crust - Crust is defined as a rocky planet's, dwarf planet's, or natural satellite's outermost solid shell.Mantle - Mantle is defined as the layer between the Earth's crust and the molten iron core, a thick layer of hot, solid rock.Core - The core are made up of two layer the outer core and the inner is the mantle.There are basically five layers of earth atmosphere.
TroposphereStratosphereMesosphereThermosphereExosphereThus, the example of the organic portion of the Earth’s outer layers is coal.
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What is the product of radioactive decay 0/-1 e called?
A. An alpha particle
B. A beta particle
C. Nuclear fission
D. A gamma wave
Answer:
it represents a beta particle so the answer is B a beta particle
Answer:
The product of radioactive decay ⁰-₁e called a beta particle
B. A beta particle
11. As early as 1938. the use of NaOH was suggested as a means of removing CO2 from the cabin of a spacecraft according to the following (unbalanced) reaction: NaOH +CO2-
Na2CO3 + H2O.
a. If the average human body discharges 925,0 g CO, per day, how many moles of NaOH are
needed each day for each person in the spacecraft?
b. How many moles of each product are formed?
For a (unbalanced) reaction: NaOH +CO2-Na2CO3 + H2O, the moles of NaOH and moles of each product are formed are mathematically given as
a) Moles of NaOH =44.05
b) Moles of Na2CO3=21.0
Moles of H2O= 21.0What is the moles of NaOH and what moles of each product are formed?
Generally, the equation for the Chemical reaction is mathematically given as
2 NaOH(aq)+ CO2(g)------> Na2CO3(aq)+ H2O(l)
Therefore
Moles of CO2= 925/44
Moles of CO2=21.0
Hence
Moles of NaOH = 2 x Moles of CO2
Moles of NaOH = 2x925/44
Moles of NaOH =44.05
In conclusion
Moles of Na2CO3 925/44
Moles of Na2CO3=21.0
And
Moles of H2O= 925/44
Moles of H2O= 21.0
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An ideal gas occupies 400ml at 270 mm Hg and 65°C. If the pressure is changed to 1.4 atm and the
temperature is increased to 100°C, what is the new volume?
Answer:
113 ml
Explanation:
PV = nRT remember T must be in Kelvin Volume in L
270 * .4 = n 62.4* 338.15
n = .005118
1.4 atm = 1.4 * 760 = 1064 mm
1064 * V = .005118 * 62.4 * 373.15
V = .113 l
As a solution becomes more basic:
how does the melting point of a substance indicate the strength of its intermolecular force of attraction
Answer:
The molecules are held together by intermolecular force of attraction. More the force the fusion takes after some time only that means the melting point is high. So molecules with greater molecular forces have high melting point and less molecular forces have low melting point.
Answer:
On heating a solid, the kinetic energy of the particle increases. The particle start vibrating with greater speed. The energy supplies by heat overcomes the force of attraction between the particles.
If this force of attraction is more, then more heat energy will be necessary to overcome this force. So, the melting point of the solid will be higher.
Which of the following is an ionic compound?
A. N2O B. CO C. HCL D. Na2O
Answer:
D. Na2O
Because we already know that sodium oxide is a binary ionic compound because it contains one metal cation and one non-metal anion.
Answer:
D. Na2O
Explanation:
Sodium oxide (Na2O) is an ionic compound. Its constituent atoms are, respectively, a metal and a non-metal.
Sodium (Na), as a metal, will attempt to lose electrons to reach an octet state. Oxygen (O2), as a non-metal, will attempt to gain electrons to reach an octet state.
:-befrank
i’ll give brainliest to whoever can give me these answers or at least the intra and intermolecular bonds answers
#1
Intermolecular bonds:-
One Single bond#Carbon monoxide
Formula:-
COMolecular geometry
LinearDrawing
C=OBonds=3
#Silicon tetrafluoride
Formula
SiF_4geometry
TetrahedralBonds=4
#Titanium (4) Sulfide
TiS_2Geometry
LinearBonds=2
Why Hydrochloric acid (HCl) is not an oxidizing agent?
please help I need proper explanation!
Answer:
Strong acids completely dissociate in water to H+ ions and extremely weak conjugate base anions.
Explanation:
its a weak acid
Answer:
because its didn't form H+ ions when react with water
If a 50.00 mL of 0.0155 M HI(aq) is mixed with 75.00 mL of 0.0106 M KOH(aq), what is the pH of the final solution
If a 50.00 mL of 0.0155 M HI(aq) is mixed with 75.00 mL of 0.0106 M KOH(aq), the pH of the final solution is mathematically given as
pH=13.16
What is the pH of the final solution?Generally, the equation for the Chemical reaction is mathematically given as
2HI+Ba(OH_2)--->BaI2+2H2O
Therefore
pOH=-log{OH}
pOH=-log(6.52)
pOH=0.8142
In conclusion, for the pH
pH+pOH=14
pH=14-0.8142
pH=13.16
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Why can’t sodium metal be manufactured by the electrolysis of brine?
Answer:
Explanation:
The quick and short answer to this question is that the moment it is made into Na (the atom) the moment that happens, Na will react with water to become NaOH. Sodium is very responsive to water.
Equation
2Na + 2HOH ====> 2NaOH + H2
What are the three main groups of macronutrients? (select three please)
minerals
proteins
fats
carboydrates
Answer:
protein, carbs, and fats.
Explanation:
Those are the three main sources of macronutrients.
(this isn't a chemistry, it's health)
Answer:
fats, carbohydrates and proteins
Explanation:
I don't know, I answered that on my test and it was correct
Balance the following equation.
( ? )NaCl + ( ? ) AgNO3 → ( ? ) AgCl + ( ? ) NaNO3
Balanced equation:
NaCl + ( 1 ) AgNO₃ → ( 1 ) AgCl + ( 1 ) NaNO₃
(aq) (aq) (s) (aq)
Both the sides are already balanced
How many grams are in 4.25 moles of NiS?
Answer:
386.75 grams
Explanation:
You can use dimensional analysis to help you solve for this question
1. set up a proportion
x grams
4.25 mol x x mole
2. to find the amount of grams/mol that are in NiS we find the gram formula mass (mass of all the atomic masses of each element)
Ni- 59 grams
S- 32 grams
add these together and you get 91 g/mol
3. now plug in the values and multiply across
91 grams
4.25 mol x 1 mole
when you multiply across this is equal to 386.75 grams
Which jobs does the respiratory system do? Select all that apply. It brings oxygen into the blood. It removes carbon dioxide waste from the blood. It pumps blood throughout the body. It takes in oxygen from air or water.
Answer:
probably the last one should hbthrbwhdee.
Answer:
it brings oxygen into the blood and removes carbon dioxide
Explanation:
How would you correctly prepare 125 mL of a 0.30M solution of copper(II) sulfate (CuSO4) from a 2.00M solution of CuSO4?
Answer:
see below
Explanation:
.3 M/L ( .125 L) = .0375 mole required
.0375 mole / 2 mole / l = .01875 l required
take 18.75 ml of the 2.0 solution then dilute it to 125 ml
Q3. Which of the following
Elements is likely to
form cations?
ง
A. Titanium (T:)
B. Carbon
C. Bromine
(Br)
) (Ar
D. Argon
Answer:
Titanium
Explanation:
titanium can form 4+ cations
Based upon the chemical equation in #2 above, if 45.7g C2H4O2 are used in the reaction, how many grams of H2O will result
calcium chloride and carbon dioxide
Predict: How do you think you could use the Gizmo to make the color gray? _____________
_________________________________________________________________________
Observe: Change the Red, Green, and Blue values to 90. What color does this produce?
_________________________________________________________________________
The simplest way to make the color gray is by mixing white and black colors, but it can also be created by mixing colors such as red and green.
What is the grey color?This is considered a neutral and cool color that can be naturally found in elements such as rocks.
How can you make this color by mixing other colors?Neutral gray: The eeasiest way to create this color is by mixing black and white. This would give you a very neutral gray.Other shades: It is also possible to make this color by mixing colors that are opposite in the colors scale such as:Yellow and purples.Red and green.This would not be a neutral gray as it will resemble a little bit the original colors.
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How many particles are there in 3 moles of Ag?
Answer:
6.022×1023 individual items of that something. You have 3 moles, so there are 3×6.022×1023 oxygen molecules
Explanation:
6.022×1023 individual items of that something. You have 3 moles, so there are 3×6.022×1023 oxygen molecules
Does cooking temperature affect the concentration of ethanoic acid in vinegar, measured by acid-base titration?
Yes it will.
Explanation:
At cooking temperature the concentration of ethanoic acid may be affected as the solution will boil therefore evaporating the water that will increase the concentration of acid in the solution.
1. If the water is not completely removed from the salt during the heating process will the reported water-to-salt mole ratio (X) be high or low? Explain
Answer:
The water in the hydrate (referred to as "water of hydration") can be removed by heating the hydrate. When all hydrating water is removed, the material is said to be anhydrous and is referred to as an anhydrate.
Explanation:
If the water is not completely removed from salt during heating process it will result in higher mole ratio of water to salt as mass of water will also be accounted while calculating mole ratio.
What is salt?Salt is defined as a chemical compound which is ionic in nature and consists of cation and an anion.It has no net electrical charge as the charges are completely neutralized in case of salts.
They are classified as acidic, basic or neutral salts depending on the ions they produce on dissolution.They have wide variety of colors depending on the elements from which they are formed and have five basic tastes.Salts are usually odorless except a few exceptions . They are highly soluble in water and are insulators in the solid state, to make them conductive they need to be melted or dissolved.
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