Answer:
T° freezing solution = -22.8°C
Explanation:
To solve this problem we apply, the Freezing Point Depression. This is a colligative property which its formula is:
T° freezing pure solvent - T° freezing solution = Kf . molality . i
i = Van't Hoff factor.
We have been informed is a nonionizing solute, so i = 1
Our solute is ethylene glycol, so le'ts determine the moles to get molality
388 g . 1 mol / 62.07 g = 6.25 moles
molality (m) = moles of solute /kg of solvent
We convert mass of solvent, water, to kg → 510 g . 1kg /1000g = 0.510 kg
6.25 mol /0.510kg = 12.25 m
We replace at formula → 0°C - T° freezing solution = 1.86°C/m . 12.25 m . 1
T° freezing solution = -22.8°C
Which of the following represents an alpha particle?
O A. je
B. He
O C. Y
O D.B
Answer:
Alpha particle- B. He (Helium 4 atom )
He represents an alpha particle and the correct option is option B.
What is an alpha particle?Alpha particles are alternatively known as Alpha radiation or Alpha rays. It is a positively charged particle emitted from the decay of various radioactive materials.
They are emitted from the nucleus of some radionuclides during a form of radioactive decay, called alpha-decay.
Alpha particle mass is due to the two protons and two neutrons bonding.
An alpha-particle is identical to the nucleus of a normal (atomic mass four) helium atom i.e. a doubly ionised helium atom.
Therefore, He represents an alpha particle and the correct option is option B.
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which do you think will warm up the plate more quickly?
A. Direct sunlight
B.Indirect sunlight
Answer: B
your welcome Bsbssnsnsmsllqql
Is a hydrogel a smart polymer/stimuli-responsive polmer?
Answer:
Polymer scientists have been trying to mimic this behavior by creating so called smart polymers. ... One of the most important classes of stimuli-responsive polymers used for controlled drug delivery is crosslinked polymer networks, e.g., hydrogels and microgels.
Explanation:
One of the main components of an airbag is the gas that fills it. As part of the design process, you need to determine the exact amount of nitrogen that should be produced. Calculate the number of moles of nitrogen required to fill the airbag. Show your work. Assume that the nitrogen produced by the chemical reaction is at a temperature of 495°C and that nitrogen gas behaves like an ideal gas. Use this fact sheet to review the ideal gas law.
The number of moles of the gas is 0.016 moles
What is the airbag reaction?We know that in the airbag, nitrogen gas is obtained by the decomposition of sodium azide as follows; 2NaN3 -----> 2Na + 3N2
Since it is under ideal conditions;
P = 1 atm
V = 1 L
T = 495°C or 768 K
n = ?
R = 0.082 atm LK-1mol-1
From;
PV= nRT
n = PV/RT
n = 1 atm * 1 L/ 0.082 atm LK-1mol-1 * 768 K
n = 0.016 moles
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Please someone help ! I need it ASAP
Answer:
6.B
7.B
Explanation:
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calculate the mass of 0.5 moles of caco3 in grams with procedure
Answer:
50g
Explanation:
moalr mass of CaCO3= 40g/mol+ 12g/mol+(16g/mol*3)
=52g/mol+48g/mol
=100g/mol
1 mol= 100g
0.5mol=x
by cross multiplication,
0.5*100gmol=x mol
x=50g
if i put regular air into a ziplock bag does carbon dioxide come out?
there is 115 mL of a gas is at 45.8 kPa and 57.2°C. What is the volume of the gas at 99.3 kPa and 112.3°C?
Answer:
115 mL of a gas is at 45.8 kPa and 57.2°C. What is the volume of the gas at 99.3 kPa and 112.3°C?[5] 11. ... What is the pressure of 62.76 g of carbon dioxide (CO2) gas if it occupies a volume of 35,000 mL at standard temperature?
Explanation:
By using gas law , the volume will be 61.9 mL .
What is gas law?
According to the gas law, the pressure of a gas generally directly proportional to its temperature at a fixed volume.
Gas law can be represented as:
[tex]P_{1} V_{1}/ T_{1} = P_{2} V_{2} / T_{2}[/tex]
Calculation of volume with the aid of gas law:
It is given that, [tex]P_{1}[/tex] = 45.8 kPa, [tex]P_{2}[/tex] = 99.3 kPa , [tex]T_{1}[/tex] = 57.2°C, [tex]T_{2}[/tex] = 112.3°C, [tex]V_{1}[/tex] = 115 mL .
Now, put the values of given data in gas laws equation.
(45.8kPa)(115mL)/(330K)= (99.3kPa)([tex]V_{2}[/tex])(385.3K)
[tex]V_{2}[/tex] = 61.9 mL
Therefore, the volume will be 61.9 mL .
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A sample of gas as a volume of 425 mL at 25°C at and 760 tour what volume with this gas sample have at STP
Answer:
[tex]\Rightarrow V_2 = 389mL[/tex]
Explanation:
To solve this question, we could use Charles' law since both the number of mole and pressure are constant
At STP pressure P = 760 tor and Temperature = 273K
V1 =425mL, T1 =298K and T2 =273K
and [tex]\frac{V_1}{T_1} =\frac{V_2}{T_2}[/tex]
[tex]\Rightarrow V_2 =T_2\times\frac{V_1}{T_1}[/tex]
[tex]\Rightarrow V_2 =273\times\frac{425}{298}[/tex]
Therefore, [tex]\Rightarrow V_2 = 389mL[/tex]
Complete and balance the following neutralization reaction, and estimate the
likely pH of the neutralization point. (3 pts)
Ca(OH)2 + HNO3 →
Answer:
we have a base-Ca(OH)2 and an acid - HNO3
→Their chemical reaction gives us water and salt Ca(NO3)+ H20 (neutralisation reaction)
the pH is expected to be acidic ... since nitric acid is a strong acid and calcium hydroxide is a weak base .
Explanation:
meet my pets Frankie and Dakota
Diamond has a hardness of 10 and chalk a harness of 1. Explain what this means.
Answer:
they have different forces holding the atoms together
Explanation:
diamond has a strong convalent bond holding the particles together while chalk has weak van der waals forces holding the particles together hence the diffrence in hardness
IS ANYONE GOOD AT CHEMISTRY?! like frr.
I need help
Question 2
5 pts
The air inside a beach ball is at a temperature of 25°C a pressure of 1.0 atm. The ball
contains 0.85 mol of air, what is its volume?
21 L
27 L
0 171
06.11
< Previous
Nest
Answer: The volume of given ball is 21 L.
Explanation:
Given : Pressure = 1.0 atm, no. of moles = 0.85 mol
Temperature = [tex]25^{o}C = (25 + 273) K = 298 K[/tex]
According to the ideal gas equation, formula used is as follows.
PV = nRT
where,
P = pressure
V = volume
n = no. of moles
R = gas constant = 0.0821 L atm/mol K
T = temperature
Substitute the values into above formula as follows.
[tex]PV = nRT\\1.0 atm \times V = 0.85 mol \times 0.0821 Latm/mol K \times 298 K\\V = 21 L[/tex]
Thus, we can conclude that the volume is 21 L.
How much does 3 moles of silica weigh
84.2565
Because
1 silica is equal to 28.0855,
times 3 is 84.2565
What happens when heat is removed from water?
The water particles move farther apart.
The water changes from a liquid to a gas.
The temperature of the water increases.
The kinetic energy of the water particles decreases.
Answer:
D). The kinetic energy of the water particles decreases.
Explanation:
Your welcome!
ANSWER
D
Explanation: Got it correct on edge 2022
What would you predict to be the valence number and oxidation number of tin?
Answer:
Tin exists in two oxidation states, +4 and +2. Elemental tin is readily oxidized to the dipositive ion in acidic solution, but this Sn2+ ion is converted to the Sn4+ ion by many mild oxidizing agents, including elemental oxygen. Oxidation under alkaline conditions normally gives the tetrapositive (Sn4+) state.
what color does a green objcet appear under red light
Answer:
black??
Explanation:
One is a negative environmental consequence of surface mining?
Answer:
Surface mining (also known as "strip mining") has the potential to significantly erode soil fertility, pollute waters, deplete underground water sources, scar or altar the landscape, damage roads, houses, and other buildings, and kill wildlife.
Select the correct answer.
Which of the following is true for a heating curve?
Ο Α.
It shows how the pressure of a substance changes when heated.
OB.
It shows how the temperature of a substance changes when heated.
OC.
It shows how the volume of a substance changes when heated.
It shows how the mass of a substance changes when heated.
OD
Reset
Next
Answer:
the answer is b: it shows how temperature of a substance changes when heated
Floodplains extend from one side of the river valley to the other.
True or False
Answer:
true
Explanation:
hope this helps!
~mina-san
Answer:
Explanation: true
Question 25 of 33
Which statement describes a periodie trend of brstionization energy?
A It tends to increase from top to bottom of a group
B. It remains the same within a period
c. It tends to decrease from top to bottom of a group
D. It tends to decrease from left to right across a period
Answer:
A) It tends to increase from top to bottom of a group
zinc crystals is made from zinc Oxide and which acid
Answer:
hydrochloric acid
Explanation:
Zinc oxide will react with hydrochloric acid to form zinc chloride and water.
sulphuric acid
So to make zinc sulphate crystals you add granulated zinc to heated sulphuric acid
PLEASE HELP HELP ME. THIS IS DUE TODAY PLEASE
Answer:
5.B 6.A
Explanation:
(sorry if this is short)
What is the mole ratio of magnesium carbonate to magnesium oxide? MgCO3 →MgO+CO2
a)3:2 b) 1:3 c) 1:1 d) 1:2 e) 2:3
Answer:
d)1:2
Explanation:
What are some facts about Radon something that is unique and relatively unknown by the general population???? Helpppppp helpppppp
Answer: Radon is radioactive
Explanation: thats all i know
A student dissolves 0.112 mol sucrose in enough water to make 4.0 L of solution. What is the molarity of the solution
Answer: Molarity of the solution is 0.028 M.
Explanation:
Given : Moles of sucrose (solute) = 0.112 mol
Volume of solution = 4.0 L
Molarity is the number of moles of solute dissolved in a liter of solvent.
[tex]Molarity = \frac{no. of moles}{Volume (in L)}\\= \frac{0.112 mol}{4.0 L}\\= 0.028 M[/tex]
Thus, we can conclude that molarity of the solution is 0.028 M.
Please answer this accurate!!!
Somebody look at all the science questions i posted plzzz help ( i will give brainliest
Answer:
ok
Explanation:
What the common uses for Rutherfordium???
Answer:
welcome
Explanation:
Uses of Rutherfordium
Because rutherfordium is made within the lab, there are not very many uses for this element commercially. On the other hand, rutherfordium has been used within the laboratory setting to conduct research. Most elements that are highly radioactive are used for nuclear power and medicinal purposes.
Select the correct answer.
Which unit is used for measuring atomic mass?
AMU-aka
Atomic mass unit
Answer:
The unit of Atomic mass is "amu"
Explanation:
Atomic mass unit