The freezing point of pure water is 0°C, the urea solution freezes at –0.186°C.
The temperature at which a liquid solution freezes to a solid is a little lower than the freezing point of the pure solvent. The freezing point depression phenomena has a straightforward relationship to the solute concentration.
The molecular weight of Urea is
14 + 2(1) + 12 + 16 + 14 + 2(1) = 60 g/mole
The number of moles of Urea = 0.6g / 60 = 0.01moles
and the concentration of the solution in moles per kilogram of water is
0.01 moles / 0.100 kg H₂O = 0.1 molal
By taking the freezing point constant for water as 1.86
Δ T f = 1.86°C/m × 0.1 m
Δ T f = 0.186
Because the freezing point of pure water is 0°C, the urea solution freezes at –0.186°C.
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What causes competition?
Explanation:
Competition stems from the fact that resources are limited. There are simply not enough of some resources for all individuals to have equal access and supply. Competition can occur between organisms of the same species, or between members of different species.
What is the H+ ion concentration of a solution with a pH of 7?
Answer:
10-7mol/l
Explanation:
Answer: 10-7mol/l
Explanation:
BRAINS
Mass = 200 g Volume = 20 cm3 What is the density?
Answer: 156
Explanation:
What is the difference between phenol and dettol?
Why is it necessary to know the temperature of the reactants and the products of a reaction in order to determine change in the Gibbs free energy of the reaction
Answer:
Free Energy (G) can either increase or decrease for a reaction when the temperature increases. It depends on the entropy (S) change. The change in a quantity is represented by the Greek letter delta. ... Hence, when the temperature increases the numeric value of the free energy becomes larger.
Explanation:
The change in Gibbs free energy (ΔG) of a chemical reaction depends on the initial and final states of the reactants and products, as well as on the temperature and pressure conditions of the reaction.
What is Gibb's free energy?The Gibbs free energy of a reaction tells us whether a reaction is spontaneous or not under given conditions, with negative ΔG values indicating a spontaneous reaction and positive ΔG values indicating a non-spontaneous reaction.
The temperature of the reactants and products is important in determining the Gibbs free energy change because the Gibbs free energy change is related to the enthalpy change (ΔH) and the entropy change (ΔS) of the reaction through the equation:
ΔG = ΔH - TΔS
where T is the temperature in Kelvin.
Thus, the temperature of the reactants and products must be known in order to calculate the Gibbs free energy change of a reaction accurately.
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WILL GIVE BRAINLIST
In the Neighborhood
Ahn vigorously scrubbed windows, a tedious necessity for her family's new Vietnamese restaurant. They had turned the building from homely to gorgeous, but everything had to be absolutely perfect: unique decorations, skillful employees, and fabulous traditional food. Then customers would adore the place, making the business a success.
Ahn shifted her vision to look outside the restaurant as a girl about her age, with abundant red hair, strolled up the street. Ahn’s family had recently moved to this neighborhood, so she had few friends.
The girl paused to study the sign announcing their opening and then looked directly at Ahn with a friendly smile. Ahn smiled back shyly and lifted a hand, accidentally waving with the cleaning cloth. The girl laughed at her amusement and waved back in acknowledgment.
Ahn hesitated, not accustomed to initiating friendship, but she felt courageous, so on a whim she opened the door. "Hello," she said, adding the first thing that entered her head, "do you like Vietnamese food?"
"I don't know, but I like to try new things,” the girl remarked, and then she introduced herself as Gabriela.
Ahn could not think of additional conversation until she had a sudden idea. "Please wait here," she requested, "and I'll be right back." She ran into the adjoining kitchen and explained her idea to her father. He was sympathetic, so seconds later Ahn presented a small package to Gabriela. "Some Vietnamese candy for you to try,” she explained. “If you enjoy it, I hope you'll return to the restaurant sometime, or even visit after school when I'll be here preparing for the dinner service."
"Excellent, I'll see you around soon.” Gabriela headed down the street, glancing back with a cheerful wave. Ahn spent the remainder of the afternoon hoping Gabriela really would return and not think Ahn’s gift was weird.
The following day, Ahn assembled bouquets of artificial flowers, orchids that would never wilt. She was admiring her accomplishment when she heard unexpected tapping and turned to see Gabriela beckoning to her with a plate covered with transparent plastic wrap. Ahn grinned with enthusiasm and opened the door with a cordial greeting.
Gabriela presented the plate and said, "I brought biscuits made from my grandmother's recipe to thank you for the delicious candy.”
"Come in, and we can have some biscuits right now," Ahn stammered, happy inside.
Gabriela entered and rotated to scan the room with its picturesque landscape mural. "Thanks, they really are wonderful, and I'm fascinated to see your restaurant."
As they snacked on the treats, Ahn fumbled for conversation and considered an offer. "Are you good with vocabulary?” she inquired. "I intend to design a publicity pamphlet for the restaurant, and I could use some assistance."
"Certainly!" Gabriela said, adding, "I'm delighted you moved into the neighborhood and thrilled I have a new friend."
Ahn grinned, now positive that the restaurant would make a wondrous impression on the community, that customers would be plentiful, and that she was going to enjoy life here immensely
Write a brief summary of the passage you just read “In the Neighborhood”. (Use at least 4 sentences).
This story is about two girls beginning a friendship. What do they do to become friends? What are some examples from the text to support your answer? (Use at least 3 sentences).
Why do you think Ahn was nervous to make friends? (Use at least 2 sentences).
Have you ever done anything to make a friend with someone? How did it turn out? (Use at least 3 sentences).
Have you ever moved to a new place or started something new? Were you nervous? Did anyone help you? (Use at least 3 sentences).
no links please
Answer:
The restraunt was amess when it was first moved into, the girl there was not fimilliar with making friends but she racked up the courage to talk to the little girl who was comming in. They soon started to build on a friendshoip that started a littl rough. But they soon becaume good friends.
Well they are both around the same age and are girls and probably don't have muh experience with that.
She was nervous to make friends because she was not really accustomed to that.
Yes and good.
Explanation:
first time on here, using my frieds old account, sorry for the spelling im in a test. Hope this hellps
Write the complete nuclear symbol for a nucleus of oxygen with 8 protons & 10 neutrons?
Answer: The complete nuclear symbol will be [tex]_8^{18}\textrm {O}[/tex]
Explanation:
The nuclear symbol is written as: [tex]_Z^A\textrm {X}[/tex] where Z= atomic number , A = mass number X = symbol of element
Atomic number is defined as the number of protons or number of electrons that are present in an atom.
For an electrically neutral atom,
Atomic number = Number of electrons = Number of protons = 8
Mass number is defined as the sum of number of protons and neutrons that are present in an atom.
Mass number = Number of protons + Number of neutrons
Mass number = 8 + 10 = 18
Thus complete symbol will be [tex]_8^{18}\textrm {O}[/tex]
PLEASE Answer asap! Which has the largest atomic radius?
A. Lithium
B. Helium
C. Oganesson
D. Francium?
Answer:
It's D. Francium
Explanation:
Atomic radii vary in a predictable way across the periodic table. The atomic radius increases from top to bottom in a group and decreases from left to right across a period. Thus, Helium is the smallest element, and Francium is the largest.
How do the mass number and atomic change as a particle goes through beta decay
Answer:
The atomic mass number does not change because a beta particle has a much smaller mass than an atom. The atomic number goes up because a neutron has turned into an extra proton, however in beta decay a fast-moving electron is fired out of the nucleolus
Hope this helped!
Based on the chemical equation, use the drop-down menu to choose the coefficients that will balance the chemical
equation:
(( H20-( H2+( 02
Answer:
[tex]2H_2O\rightarrow 2H_2+O_2[/tex]
Explanation:
Hello there!
In this case, for the reaction by which water is decomposed to molecular hydrogen and oxygen:
[tex]H_2O\rightarrow H_2+O_2[/tex]
It is necessary to perform the inspection balance process since there is a dissimilar number of atoms of oxygen on both sides; therefore, by putting a 2 on water we balance oxygen:
[tex]2H_2O\rightarrow H_2+O_2[/tex]
But now, there are four hydrogens on the left; therefore, we put a 2 on hydrogen to finally balance it:
[tex]2H_2O\rightarrow 2H_2+O_2[/tex]
And obviously, the coefficient in oxygen is an unwritten 1.
Best regards!
Which layer of the sun is shown extending into space in the picture above?
Answer:
Corona
Explanation:
The outermost layer of the sun's atmosphere is called the corona, meaning “crown.” The corona is formed of thin wisps of gas that extend outward into space for millions of miles. It is much less bright than the photosphere, so we can only see it if the rest of the sun is blotted out, for example during a solar eclipse.
Which of the following best explain how Earth's rotation relates to living systems?
A. Earth’s rotation severely limits the amount of sunlight hitting a given region, which prevents living systems from surviving
B. By stabilizing temperatures for a given region, earth’s rotation helps sustain living systems in that region
C. Earth’s rotation forces many animals to migrate in order to continuously receive the Sun’s rays
D. Because Earth’s rotation brings darkness to a given region, plants are unable to survive in that region at night
Answer:
I think it's B
But A seems a good answer too
It might be D
But Imma go for C
Explanation:
PLEASE NO LINKS OR FILE SCAMS
what is the balanced equation for CuSO4 + 2NaOH → Cu(OH)2 + Na2SO4 I just want the answer please help
A 3.4 g sample of an unknown monoprotic organic acid composed of C,H, and O is burned in air to produce 8.58 grams of carbon dioxide and 1.50 grams of water vapor. It was also determined that 279 mL of 0.1 M KOH was needed to titrate the acid completely.
Answer:
[tex]C_7H_6O_2[/tex]
Explanation:
Hello there!
In this case, we can divide the problem in three stages: (1) determine the empirical formula with the combustion analysis, (2) compute the molar mass of acid via the moles of the acid in the neutralization and (3) determine the molecular formula.
(1) In this case, since 8.58 g of carbon dioxide are released, we can first compute the moles of carbon in the compound:
[tex]n_C=8.58gCO_2*\frac{1molCO_2}{44.01gCO_2}*\frac{1molC}{1molCO_2}=0.195molC[/tex]
And the moles of hydrogen due to the produced 1.50 grams of water:
[tex]n_H=1.50gH_2O*\frac{1molH_2O}{18.02gH_2O}*\frac{2molH}{1molH_2O} =0.166molH[/tex]
Next, to compute the mass and moles of oxygen, we need to use the initial 3.4 g of the acid:
[tex]m_O=3.4g-0.195molC*\frac{12.01gC}{1molC}-0.166molH*\frac{1.01gH}{1molH} =0.89gO\\\\n_O=0.89gO*\frac{1molO}{16.0gO}=0.0556molO[/tex]
Thus, the subscripts in the empirical formula are:
[tex]C=\frac{0.195}{0.0556}=3.5 \\\\H=\frac{0.166}{0.0556}=3\\\\O=\frac{0.0556}{0.0556}=1\\\\C_7H_6O_2[/tex]
As they cannot be fractions.
(2) In this case, since the acid is monoprotic, we can compute the moles by multiplying the concentration and volume of KOH:
[tex]n_{KOH}=0.279L*0.1mol/L\\\\n_{KOH}=0.0279mol[/tex]
Which are equal to the moles of the acid:
[tex]n_{acid}=0.0279mol[/tex]
And the molar mass:
[tex]MM_{acid}=\frac{3.4g}{0.0279mol} =121.86g/mol[/tex]
(3) Finally, since the molar mass of the empirical formula is:
7*12.01 + 6*1.01 + 2*16.00 = 122.13 g/mol
Thus, since the ratio of molar masses is 122.86/122.13 = 1, we infer that the empirical formula equals the molecular one:
[tex]C_7H_6O_2[/tex]
Best regards!
Which of the following is a true statement about odors?
A. All odors are made of particles.
B. Odors move in all directions.
C. Odors can be detected.
D. All of the above.
Which is not a chara
Write .. hot copper metal reacts with chlorine gas to form solid green copper chloride
in word equation
Answer:
Cu + Cl2 → CuCl
To happen the reaction, copper metal is heated.
Word equations are used to denote the chemical reaction in numbers and letters. The word equation between metal and gas is given as, copper + chlorine → copper chloride.
What is a word equation?Word equation is the representation of the chemical reaction by the use of letters, words, and numbers. It allows knowing the qualitative information of the reactants and products involved not reaction. It differs from the formula reaction as the latter involves the coefficients and the chemical symbols.
The word equation between a metal and a gas is given as:
copper + chlorine → copper chloride
This reaction involves copper metal that gets oxidized and chlorine gas that gets reduced to form copper(II) chloride.
Therefore, the word equation for copper metal and chlorine gas is, copper + chlorine → copper chloride.
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What variables are used to calculate speed
S /\ Speed
mph, km/h, ft/s
Answer:
Calculating speed, distance and time
We can use formulas to model real-life situations. For example, the formula for calculating speed is speed = distance ÷ time. It is possible to calculate the speed, distance or time if you have the other two values.
Explanation:
3. Universal indicator is used to
determine the pH of a solution. Which
statement is correct?
A. Universal indicator turns red in
strong alkali.
B. Universal indicator turns blue in
strong acid.
C. Universal indicator turns orange in
weak acid.
Answer:
C.Universal indicator turns orange in
weak acid.
Explanation:
option A and B are incorrect coz universal indicator turns red in strong acid and in strong alkali (base) it turns blue
please join me for dinner tonight.(write the sentence kind).give the right answer for this question
Answer:
Sentence type wish
The answer to the question: No.
Answer:
Will you join me for dinner tonight?
Explanation:
like and rate and brainiest plz
The theoretical yield of ammonia in a reaction is 865 g. What is the percent
yield if 657 g is produced?
A- 38.0%
B- 132%
C- 152%
D- 76%
Answer:
657/865= 75.9
D. 76%
If 3.0 moles of a gas are in a 60.0 liters container at 400.0 K, what is the pressure, in atm, inside
the container?
A.
0.61 atm
B.
16 atm
C.
1.6 atm
Answer:
C. 1.6 atm
Explanation:
PV = nRT
Solve for P --> P = nRT/V
n = 3.0 mol
R = 0.08206 L atm / mol K
T = 400.0 K
V = 60.0 L
P = (3.0)(0.08206)(400.0) / (60.0) = 1.6 atm
At a certain temperature 3.24 moles of co2 gas at 2.15atm takes up a volume of 35.28 what is the temperature in celsius
Answer:
The temperature is 12.35 C.
Explanation:
An ideal gas is a theoretical gas that is considered to be composed of point particles that move randomly and do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.
An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of the gases:
P * V = n * R * T
In this case:
P= 2.15 atmV= 35.28 Ln= 3.24 molesR= 0.082 [tex]\frac{atm*L}{mol*K}[/tex]T= ?Replacing:
2.15 atm* 35.28 L= 3.24 moles* 0.082[tex]\frac{atm*L}{mol*K}[/tex] * T
Solving:
[tex]T=\frac{2.15 atm* 35.28 L}{3.24 moles* 0.082\frac{atm*L}{mol*K}}[/tex]
T=285.5 K= 12.35 C (being 273.15 K= 0 C)
The temperature is 12.35 C.
The relation between the moles, volume, temperature, and pressure is given by the ideal gas equation. The temperature of a gas is 12.35 celsius.
What is the ideal gas law?The ideal gas law is the hypothetical gas law that depicts the relation between pressure, volume, moles of the compound, and the temperature of the gas.
The ideal gas equation is given as,
[tex]\rm PV = nRT[/tex]
Given,
Pressure (P) = 2.15 atm
Volume (V) = 35.28 L
Number of moles (n) = 3.24 mol
Gas constant (R) = 0.082
Temperature (T) = ?
Substituting values in the above equation, the temperature is calculated as:
[tex]\begin{aligned} \rm T &= \rm \dfrac{PV}{nR}\\\\&= \dfrac{2.15\times 35.28}{3.24 \times 0.082}\\\\&= 286.23 \;\rm K\end{aligned}[/tex]
Therefore, 12.35 degrees Celsius is the temperature of the gas.
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Who was one of the first scientists to realize the effects of CO2 in the atmosphere?
When did he do this?
How was it measured?
Where?
Answer:
Who: Svante Arrhenius.
When: Claimed in 1896 that fossil fuels has a negative effect on our atmosphere.
How: Svante Arrhenius proved that fossil fuels had a negative effect by calculating the output of buildings that emit fossil fuels, and lead to the conclusion by his calculations that the industry might one day bring global warming. Svante Arrhenius' theory of electrolytic dissociation and his model of the greenhouse effect also helped him to prove that his remarks about fossil fuels and global warming is true.
Where:
I cannot find any source that mentions the where. What do you mean by where?
I hope my other information help you. I apologies to only be able to answer partially.
The one of the first scientists to realize the effects of CO₂ in the atmosphere is Svante Arrhenius.
What do you mean by effect of CO₂?In this question effect mat be define the possitive impact or negative impact of carbon dioxide gas in the atmosphere.
Scientist Svante Arrhenius is the first one who realize the effects of CO₂ in the atmosphere.In the year 1896 he put his thought about CO₂.By measuring the output of buildings that emit fossil fuels, he established that fossil fuels have a negative influence, and his calculations led to the conclusion that the industry may one day cause global warming. Svante Arrhenius' electrolytic dissociation theory and greenhouse effect model also aided him in proving that his statements concerning fossil fuels and global warming are correct.Hence, Svante Arrhenius is one of the first scientists to realize the effects of CO₂ in the atmosphere.
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SOMEONE PLEASE HELP ME ON THIS QUESTION ASAP!!! NO LINKS
Answer:
as for my answer is C.....
3) What is the mass of 1 mole of selenium (Se)?
Answer:
78.96 grams
Explanation:
I looked it up and that's what I found
hope it helps
Answer:
78.96 g mol
Explanation:
78.96 g mol
in the period table the mass of Se is 78.96 g mol
How many grams is 2.393 x 10^24 atoms of CI
70.45 g CI
140.9 ga
140.9 mole CI
70.45 mole CI
How many grams is 2.393 x 10^24 atoms of O
70.45 g O
140.9 g O
63.58 mole O
63.58 g O
Answer: 1. 140.9 g Cl
2. 63.58 g O
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given atoms}}{\text {avogadro's number}}[/tex]
1. [tex]\text{Number of moles of Cl}==\frac{2.393\times 10^{24}}{6.023\times 10^{23}}=3.973moles[/tex]
1 mol of Cl weighs = 35.5 g
Thus 3.973 mol of Cl weighs = [tex]\frac{35.5}{1}\times 3.973=140.9g[/tex]
2. [tex]\text{Number of moles of O}==\frac{2.393\times 10^{24}}{6.023\times 10^{23}}=3.973moles[/tex]
1 mol of O weighs = 16 g
Thus 3.973 mol of O weighs = [tex]\frac{16}{1}\times 3.973=63.58g[/tex]
what is the molarity of a solution in which 6.9 moles of potassium chloride is dissolved in water to a final volume of 1.8 L?
Answer: 3.83
Explanation:
Answer:
3.83 :)
Explanation:
:)
what tools are used to predict blizzards
Answer:
someone people use Doppler radar
Explanation:
How many formula units are there in 1.34 moles of Lithium Bromide (LiBr)? (write your answer in scientific notation).
Answer:
8.07×10²³ units
Explanation:
6.02×10²³×1.34
8.07×10²³ units
How many moles are in 2.5 g of N2?
0.089 moles
0.18 moles
1.3 moles
O
11 moles
Answer:
0.089 moles
Explanation:
Answer:
a
Explanation:
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