ΔTf=−0.634°C
Explanation:
We're asked to find the freezing point depression of a solution.
To do this, we use the equation
ΔTf= i⋅m⋅Kf
where,
ΔTf is the change in freezing point temperature that we're trying to find.
i is the Van't Hoff factor, which is given as 1 (and usually is 1 in the case of nonelectrolytes)
m is the molality of the solution, which is
molality = mol solute /kg solvent
Convert the given mass of sucrose to moles using its molar mass:
35.0g sucrose(1lmol sucrose342.30g sucrose)=0.102 mol sucrose
The molality is thus
molality=0.120lmol sucrose/0.3000lkg water=0.341m
K f is the molal freezing point constant for the solvent (water), which is given as −1.86°C/m
Plugging in known values, we have
ΔTf=(1)(0.341m)(−1.86l°C/m)
=−0.634l°C
This represents how much the freezing point decreases. The new freezing point of the solution is found by adding this value from the normal freezing point of the solvent ( 0.0°Cfor water):
new f.p. = 0.0°C −0.634°C
= −0.6341°C
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What are two short-term and two long-term storages (aka reservoirs) in the carbon cycle?
Answer:
What are often called carbon sinks like tropical forests only store carbon temporarily. The only real carbon sinks operate by the long term ...
Explanation:
the oceans and atmosphere, and dissolved organic matter is carried in solution by rivers from soils to the sea. This all constitutes the short-term carbon cycle. The word "short-term" is used because the characteristic times for transferring carbon between reservoirs range from days to tens of thousands of years.
In the short-term reservoir, carbon is stored in the atmosphere, oceans and biosphere with the ocean containing the largest amount of carbon. It takes months to centuries to recycle carbon dioxide through the short-term reservoir.
Carbon is stored in four main reservoirs -- oceans (the largest reservoir), geological reserves of fossil fuels, the terrestrial surface (plants and soil, mainly), and the atmosphere.
A small particle has a mass of 62.0 ng. In a container, you find 3.11 x 1010 kg of the particles. Determine the
number of moles of the particles in the container. Assume that all the particles are identical and has the same
mass.
(Please note: The mass of 3.11 × 10¹0 kg in this question does not include the mass of the container.)
1.20 x 10³ moles
1.20 x 10 moles
1.16 x 1000 males
8.33 x 10³ moles
8.33 x 10 moles
The number of moles of the particles in the container is 8.4 * 10⁻⁴ moles.
What is the number of moles of particles of the particle in the container?The number of moles of particles of the particle in the container is found as follows:
Mass of one atom of the particle = 62.0 ng
Mass of one atom of the particle in g = 6.2 × 10⁻⁸ g
Mass of one atom of the particle in kg = 6.2 × 10⁻¹¹ kg
Number of particles in 1 mole = 6.02 * 10²³
Mass of 1 mole of the particle = 6.02 × 10²³ × 6.2 × 10⁻¹¹ kg
Mass of 1 mole of the particle = 3.7 × 10¹³ kg
Number of moles in 3.11 * 10¹⁰ kg = 3.11 * 10¹⁰ kg/3.7 × 10¹³ kg/mol
Number of moles in 3.11 * 10¹⁰ kg = 8.4 * 10⁻⁴ moles
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Pls helpi dont understand how did she get all of this number whoever explains to me good i will mark the brainlist
Explanation:
basically first you have to understand these definitions
*mass number ( e.g. where it says oxygen 16 or 17 - it's basically that number at the top)
mass number is the 'number of protons + number of neutrons'
now this will help you do the first question
if you do 16 -8 = 8 ( that's how she got 8 neutrons)
another thing you need to know is that all the time the number of protons = the number of electrons ( they are the same)
this will help you answer table 2
for fluorine it says there are 9 electrons, you automatically have to think 9 electrons means 9 protons too, ( I think she has got that wrong, it's supposed to be 9 protons not 19)
if you have 9 protons and the given 10 neutrons and add them together you will get the mass number which is supposed to be 19
then if you try out the same rules for argon you will see they work - the number of electrons and protons are same and when you find out the protons, you can just take that away from the mass number ( which is number of protons + neutrons) to get just the number of neutrons.
Hope this helps you :)
Question 5 of 10
What experiment did J. J. Thomson do?
A. He hit metal plates with light.
B. He shot alpha particles through gold foil.
C. He suspended charged oil drops in a chamber.
OD. He sent a cathode ray between electrically charged metal plates.
J.J. Thomson sent a cathode ray between electrically charged metal plate. The aim of the experiment was to find the nature of the particles. The correct option is option D
What precisely was JJ Thomson evaluating?He lighted the metal plates. A gold foil was subjected to an alpha radiation beam by B. C. In a chamber, he suspended charged oil drops. OD. He produced a cathode ray discharge between two electrically charged metal plates. All atoms include tiny, negatively charged subatomic particles that mimic electrons, as demonstrated by J.J. Thomson's cathode ray tube studies. In Thomson's "plum pudding" atom model, a negatively charged "electon" encircled a positively charged "soup."
What was the purpose of JJ Thomson's experiment?He made the decision to attempt to identify the particle's makeup. He sought to calculate their mass and charge by measuring how much they were bent by electrical currents of various intensities because they were too small to have their mass or charge directly ascertained.
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I need these 3 questions answered with work shown :( I’m so bad at chem
(A) The volume of Carbon tetrachloride is 96.2 ml
(B) The density of Solid object is 3.89 g/mL
(C) The mass of water in grams is 425 gram
(A)
Molar mass of Carbon tetrachloride is 153g/mol
Density is given as 1.59g/ml
Density = mass/volume
1.59 = 153/volume
volume = 153/1.59 = 96.2 ml
Hence, volume of Carbon tetrachloride is 96.2 ml
(B)
The experiment applies Archimedes' principle, according to which the volume of a liquid that an object displaces is equal to the volume of the thing itself.
As a result, the object's displacement of volume is:
18.9 mL - 43.9 mL = 25.0 mL
The item has a capacity of 18.9 mL.
The mass divided by the volume gives the density, so:
D = m / V = 73.5 g /18.9 mL
D = 3.89 g/mL
Hence, density of Solid object is 3.89 g/mL
(C)
Volume of water in beaker = 425 ml
Density of water is 1g/ml
Density = Mass/Volume
Mass = Density x Volume = 425 x 1 = 425 gram
Hence, mass of water in grams is 425 gram
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What volume of silver metal will have a mass of exactly 2500.0 g? The density of silver is 20.5 g/cm3.
Answer: 122 cm^3
Explanation:
2500.0 g * 1 cm^3/20.5 g=
2500.0 * 1/20.5=
2500.0/20.5=122 cm^3
Can anyone help with these ionic equations? Many thanks
The ionic equations of the given reactions are as follows:
Ionic equation: Na⁺ OH⁻ + Fe³⁺ 3NO₃⁻ → Fe(OH)₃(s) + 3Na⁺ 3NO₃⁻Ionic equation: 2Ag⁺ 2NO₃⁻ + Mg → Mg²⁺ 2NO⁻ + 2 Ag (s)Ionic equation: 2H⁺ SO₄²⁻ + 2K⁺ 2OH⁻ → 2K⁺ SO₄²⁻ + 2H₂O (l)What are ionic equations?Ionic equations are equations which shows the ions involved in a given redox reaction as they react to form products.
The ionic equations of the given reactions are as follows:
a) precipitation of iron(III) hydroxide when solutions of sodium hydroxide and iron(III) nitrate are mixed
Molecular equation: NaOH + Fe(NO₃)₃ → Fe(OH)₃(s) + NaNO₃
Ionic equation: Na⁺ OH⁻ + Fe³⁺ 3NO₃⁻ → Fe(OH)₃(s) + 3Na⁺ 3NO₃⁻
b) redox reaction between solution of silver(1) nitrate and magnesium metal
Molecular equation: 2 AgNO₃ + Mg → Mg(NO₃)₂ + 2 Ag (s)
Ionic equation: 2Ag⁺ 2NO₃⁻ + Mg → Mg²⁺ 2NO⁻ + 2 Ag (s)
c) acid-base reaction between sulfuric acid and potassium hydroxide
Molecular equation: H₂SO₄ + 2KOH → K₂SO₄ + 2H₂O
Ionic equation: 2H⁺ SO₄²⁻ + 2K⁺ 2OH⁻ → 2K⁺ SO₄²⁻ + 2H₂O (l)
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If 0.459 g of an unknown sugar is dissolved in 100.0 mL of water its osmotic pressure is found to be 0.0824 atm.. If the temperature of the solution was 298 K, what is the molar mass of the sugar (in g/mol)? Give your answer to three sig figs
The molar mass of the sugar is 1350 g/mol.
What is the osmotic pressure?We define the osmotic pressure as the pressure that needs to be applied to effect the movement of the solvent across a semi permeable membrane.
Number of moles of the sugar solution = 0.459 g/MM
Where MM = molar mass
We know that the osmotic pressure is obtained from;
π = icRT
i = Van't Hoff factor
c = concentration
R = molar gas constant
T = temperature
Let us obtain the concentration;
c = π/iRT
c = 0.0824 atm/ 1 * 0.082 * 298
c = 0.0034 M
Now;
Concentration = Number of moles/volume
Volume = 100.0 mL or 0.1 L
0.0034 = 0.459/MM/0.1
0.0034 = 0.459/0.1MM
0.0034 * 0.1MM = 0.459
MM = 0.459/ 0.0034 * 0.1
MM = 1350 g/mol
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Which group helped Fred Korematsu defend himself in court?
A. National Association for the Advancement of Colored People
B. American Civil Liberties Union
C. Southern Civil Liberties Council
D. Congress for Racial Equality
National Association for the Advancement of Colored People group helped Fred Korematsu defend himself in court,
Who was Fred Korematsu?Fred Toyosaburo Korematsu (January 30, 1919 – March 30, 2005) was an American civil rights activist who opposed Japanese American incarceration during WWII. Shortly after the Imperial Japanese Navy attacked Pearl Harbor, President Franklin D. Roosevelt issued Executive Order 9066, which authorised the removal of Japanese-Americans living on the West Coast from their homes and their mandatory imprisonment in incarceration camps, but Korematsu instead challenged the orders and fled.
The validity of Roosevelt's order was maintained by the United States Supreme Court in Korematsu v. United States. (1944). However, Korematsu's conviction for avoiding imprisonment was overturned in US District Court four decades later, following the emergence of fresh information questioning the necessity of internment.
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this one is a two part question. the first part got cut off but it is-
“Electrolyte solutions conduct electricity because electrons are moving through the solution.”
The statement is true because ions are mobile in the solution and the presence of uncharged particles do not affect conductivity. Option A
What is an electrolyte?An electrolyte is a solution that is able to conduct electricity. We know that the electrolyte is able to conduct electricity because of the presence of ions in the solution. These ions are mobile charges that move in between the electrodes and make the movement of electricity possible.
If we introduce uncharged particles into this solution, they do not in anyway affect the charged particles from the electrolyte. Hence, the statement is true because ions are mobile in the solution and the presence of uncharged particles do not affect conductivity. Option A
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Multiplying by which conversion factor would allow you to convert 35 liters to milliliters?
Answer: The "conversion factor" is:
___________________
" 1000 mL "
1 L
___________________
Explanation:
Note the exact values: 1 L = 1000 mL
and: 1000 mL = 1 L .
{Note: " L = liter(s) " ; and: " mL = millileter(s) ".}.
________________________
35 L * 1000 mL
1 L ;
We cancel out the 2 (two): " L " ["Liters"] ; since: [" L ÷ L = 1 "].
Then we can convert the value—into units of "mL" ;
→ 35 * (1000 mL) = (35 * 1000) mL = 35,000 mL.
________________________
Note that the question asks for the:
"conversion value needed to convert [35 L into mL] ;
By using the technique shown above; known as "dimensional analysis, we use that particular conversion faction—of a manner in which one multiplies by a "fraction"; so that:
1) the correct units for the particular value one is seeking that can be obtained—and in which the values, or more relevantly, the units —that are "not needed" can be "canceled out" ; and:
2) The problem can be solved.
________________________
Note: The above information is just information that provides an explanation of the concepts surrounding the "actual answer"—of this very question."
The actual answer to this Brainly question:
As shown above:
_____________
The 'conversion factor is:
" 1000 mL "
1 L
__________
Hope this lengthy explanation—and answer—are helpful.
Best wishes!
Answer:
1000/1
Question 5 options:
Multiplying by which conversion factor would allow you to co
Explanation:
Which two are examples of mechanical weathering mentioned in the article? 5 points
freeze thaw, salt wedging
freeze thaw, river erosion
freeze thaw, acid rain
river erosion, salt wedging
Answer:
Freeze thaw, salt wedging
Explanation:
Freeze-thaw weathering occurs when rocks are porous (has holes) or permeable (allows water to pass through). It is an example of Mechanical Weathering.
Another type of mechanical weathering is called salt wedging.
A mixture of N2(g) and H2(g) reacts in a closed container to form ammonia, NH3(g). The reaction ceases before either reactant has been totally consumed. At this stage 1.0 mol N2, 1.0 mol H2, and 1.0 mol NH3 are present.
How many moles of N2 and H2 were present originally?
The moles of [tex]N_2[/tex] and [tex]H_2[/tex] that were present originally in the reaction will be 1.5 moles and 2.5 moles respectively.
Mole ratios in reactionsThe two reactants, [tex]N_2[/tex] and [tex]H_2[/tex], react in a closed container to form [tex]NH_3[/tex]. The normal stoichiometric ratio of the reaction is according to the following equation:
[tex]N_2 (g) + 3H_2 (g) --- > 2NH_3 (g)[/tex]
The stoichiometric ratio of [tex]N_2[/tex], [tex]H_2[/tex], and [tex]NH_3[/tex] is 1:3:2.
This means for every 1 mole of ammonia formed, 0.5 moles of [tex]N_2[/tex] and 1.5 moles of [tex]H_2[/tex] is required.
However, 1 mole of [tex]N_2[/tex] and 1 moles of [tex]H_2[/tex] remained after the reaction has ceased.
Thus, total amount of [tex]N_2[/tex] present originally = 1 + 0.5
= 1.5 moles
Total amount of [tex]H_2[/tex] present originally = 1 + 1.5
= 2.5 moles
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How many electrons can fill all the p orbits from n = 1 through n = 3?
O 18
O12
0 3
0 6
Answer:6
Explanation: a p orbital can hold 6 electrons
area of sience that studies tiny particles like atoms?
A ball has a density of 0.5 g/cm³ and a volume of 2g. Calculate the mass of the ball.
Suppose 1.50 g of Cu(s) reacts completely with 5.95 g of HNO3(aq). The reaction produces 4.43 g of Cu(NO3)2(aq), 0.85 g of H2O(l), and an unknown amount of NO2(g). If the reaction obeys the law of conservation of mass, how many grams of NO2(g) are produced?
The mass in grams of NO₂ produced from the reaction, given the data is 2.17 g
What is a chemical equation?Chemical equations are representations of chemical reactions using symbols and formula of the reactants and products.
The reactants are located on the left side while the products are located on the right side.
Reactants —> Products
The balancing of chemical equations follows the law of conservation of matter which states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.
How to determine the mass of NO₂ producedThe mass of NO₂ produced can be obtained as follow:
Mass of Cu = 1.5 gMass of HNO₃ = 5.95 gMass of Cu(NO₃)₂ = 4.43 gMass of H₂O = 0.85 gMass of NO₂ =?Balanced equation:
Cu + 4HNO₃ --> Cu(NO₃)₂ + 2H₂O + 2NO₂
1.5 + 5.95 = 4.43 + 0.85 + Mass of NO₂
7.45 = 5.28 + Mass of NO₂
Collect like term
Mass of NO₂ = 7.45 - 5.28
Mass of NO₂ = 2.17 g
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What is the formula of trinitrogen heptoxide?
Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer.
a
b
C
d
U3VD Question 2
Homework Unanswered
NO
N3O
N₂O₁
Resue
NOT
The molecular formula of trinitrogen heptoxide is written as [tex]N_3O_7[/tex].
How to calculate the molecular formula of Trinitrogen heptoxide:
Tri means three and hept means seven. Therefore,
Trinitrogen means 3 atoms of Nitrogen, thus it is denoted as [tex]N_3[/tex].
Heptoxide means 7 atoms of Oxygen, thus it is denoted as [tex]O_7[/tex].
Consequently, the molecular formula of Trinitrogen heptoxide is [tex]N_3O_7[/tex].
The type and number of each element's atoms in a molecular compound are indicated by the substance's molecular formula. The molecular formula is frequently the same as the empirical formula. Methane's empirical formula is [tex]CH_4[/tex], which is also its molecular formula because it only has one carbon atom.
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i need help with this pls i don’t understand it
Answer:
Inner core - A
Outer core - B
Mantle - C
Asthenosphere - F
Lithosphere - E
Crust - D
How are the separation methods for homogeneous and heterogeneous mixtures compared?
1. A homogeneous mixture could be separated through distillation, while a heterogeneous mixture could be separated through filtration.
2. A homogeneous mixture could be separated through filtration, while a heterogeneous mixture could be separated through distillation.
3. A homogeneous mixture can be separated physically, while a heterogeneous mixture can be separated chemically.
4. A homogeneous mixture can be separated chemically, while a heterogeneous mixture can be separated physically.
The separation methods for homogeneous and heterogeneous mixtures compared are A homogeneous mixture could be separated through distillation, while a heterogeneous mixture could be separated through filtration. The correct option is 1.
What is a homogeneous mixture?A homogeneous mixture is a mixture that contains a substance that remains homogeneous throughout the solution. The solution of salt and water is a homogeneous mixture.
Thus, the correct option is 1. Distillation can be used to separate homogeneous mixtures, while filtering can be used to separate heterogeneous mixtures.
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A beaker of water has an initial mass of 455.2 g. After it has been left uncovered
for several days, some of the water has evaporated. The new mass of the beaker
is found to be 422.55 g using a more precise balance. Choose that value that
expresses the mass of the evaporated water using the correct number of
significant figures.
A) 32.65 g
B) 32.7 g
C) 33 g
D) 32.650 g
The mass of water evaporated is 32.7 g.
What is evaporation?The term evaporation is the movement of the molecules of water from the surface of the water into the atmosphere. The molecules that move are the more energetic molecules that are able to break away from the attractive field of the surface of the water.
We have the original mass of the water as 455.2 g and the mass of the water after evaporation as 422.55 g. The difference between the two according to the right number of significant figures is 455.2 g - 422.55 g = 32.7 g
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Campher freezes in winter or not?
Answer:
Campher freezes are in winter
How many grams of AlCl3 are there in 205 grams of an aqueous solution that is 13.8 % by weight AlCl3.
_____ G AlCl3
28.9 grams of AlCl3 are present in 205 grams of an aqueous solution that is 13.8 % by weight AlCl3.
What is an aqueous solution?
Aqueous is a word used to describe a water-based system. The term aqueous can also refer to a solution or combination in which water serves as the solvent. The type of a substance's chemical bonding determines whether or not it forms an aqueous solution.
When a material dissolves in water, the symbol (aq) is appended to its chemical name. Many ionic chemicals and hydrophilic (water-loving) entities dissolve in water.
Table salt, for example, is dissolved in water and diffuses into ions to generate Na+(aq) and Cl- (aq). Hydrophobic, or water-averse, substances do not dissolve in water or produce aqueous solutions. There will be no dissociation if oil and water are mixed.
The weight of the aqueous solution = is 205 grams.
Percentage of AlCl₃ = 13.8%
Therefore, the weight of AlCl₃ by gram =
13.8% of the solution
= 13.8 % × 205
= 28.9g
Therefore the weight of AlCl₃ in the aqueous solution will be 28.9g
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what is correct answer key pdf
You are conducting the Air Bag Lab with a snack sized ziplock bag (325mL). How many moles of gas would be needed to fill the bag?
0.1329 moles
Air Bag Lab with a snack sized ziplock bag (325mL), moles of gas would be needed to fill the bag
From the above statement, we have got
volume = 325ml
now at STP
Temp = 298 kelvin
pressure = 1 atm
Gas constant R = 0.082057L/mol kelvin
n is the number of moles
now, according to ideal gs equation
PV=nRT
n = PV RT
now put all the numbers in equation
n = 1 ×0.325 ÷0.082× 298
n = 0.1329 moles
One mole is defined as the quantity of a material that equals the number of ions, atoms, molecules, etc. that are present in exactly 12 grams of the C-12 (C = carbon) isotope.The quantity that is equal to Avogadro's number is the mole. To count items at the minute level, we employ the mole notion. The mole was suggested as the seventh basic unit for the quantity of a material in the SI system.To know more about mole
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In films, familiar tunes may be associated with particular characters and moods.
A. False, familiar tunes may not be associated with either characters or moods.
B. False, familiar may be associated with characters only
C. False, familiar may be associated with moods only
D. True
Answer:D
Explanation:it is true
HELP PLEASE!! What happens to the average kinetic energy of a gas when the particles of the gas collide against each other at a constant temperature and volume?
The average kinetic energy remains constant.
The average kinetic energy drastically increases.
The average kinetic energy drastically decreases.
The average kinetic energy gets added to the potential energy.
At constant temperature and volume, the average kinetic energy of the particles remains constant. The correct option is A.
What is kinetic energy?An object's kinetic energy is the energy it has as a result of its motion. It is characterized by the amount of work needed to propel a body of a given mass from rest to a given velocity.
The body retains its kinetic energy after gaining it during acceleration unless its speed changes.
The average kinetic energy of a gas when its particles collide against each other at constant temperature and volume. This is valid as long as as the temperature stays the same.
Thus, the correct option is A.
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How many grams of Oxygen are in 4 moles of C2H4O2? Show work.
The mass of oxygen in 4 moles of C2H4O2 is 128g.
How to calculate mass?The mass of a substance can be calculated by multiplying the number of moles of the substance by its molar mass.
Molar mass of C2H4O2 = 12(2) + 1(4) + 16(2) = 60g/mol
mass of C2H4O2 = 60g/mol × 4 moles = 240grams
However, the mass of oxygen in the compound can be calculated as follows:
molar mass of oxygen/molar mass of compound × 240 grams
32g/mol ÷ 60g/mol × 240g
= 128g
Therefore, the mass of oxygen in 4 moles of C2H4O2 is 128g.
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you have a 100.0-mL graduated cylinder containing 50.0 mL of water. You carefully place a 140-g piece of brass (density = 8.56 g/mL) into the water. What is the final volume reading in the graduated cylinder?
There is 100.0-mL graduated cylinder containing 50.0 mL of water. The final volume reading in the graduated cylinder is 62.7 mL.
What is volume?Volume is the space occupied by the three-dimensional object.
Given,
Density of liquid = 8.56 g/mL
Mass of substance = 109 g
The initial level of the water in the graduated cylinder = 50 .0 ml
To calculate the volume of a substance,
Density = mass / volume
8.56 = 109 / volume
volume = 109 / 8.56
V = 12.7 ml
The final volume reading in the graduated cylinder
50 ml + 12.7 mL = 62.7 mL
Thus, the final volume will be 62.7 mL
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There are × 10 grains of sand on the beaches.
How many sand grains make up each beach on the planet Earth?
The Earth has approximately (and we're speaking very roughly here) 7.5 x 1018 grains of sand, or seven quintillions, five hundred quadrillion grains, if you assume a grain of sand has an average size, calculate how many grains are in a teaspoon, and then multiply by all the beaches and deserts in the world.
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It's safe to suppose that after walking for around 30 seconds on a beach, you would have likely passed trillions of sand grains.
Assume a beach has medium-sized sand that is typically 0.3mm in diameter. Of course, the majority of beach sand contains some space because the grains are primarily spherical. So, for the time being, let's suppose a 23% porosity. Accordingly, a beach that is 1 square meter in size and 3 meters deep should be able to accommodate around 163 billion grains of sand. It's possible that the porosity will be as high as about 48%, but don't take my word for it; there's a mathematical maximum that I can't quite recall. The depth of sand at the beach can very much be anything up to maybe even 15-20m, and the sand grain size can vary widely. It's safe to suppose that after walking for around 30 seconds on a beach, you would have likely passed trillions of sand grains.
The complete question is -How many grains of sand are there in a given stretch of an average beach?
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