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
The half life of tritium is 12.3 years. How much sample will remain if you start with 425g of tritium that is found after 4 half lives?
Answer:
26.56g
Explanation:
The half life of an isotope decay is the time transcurred when the initial amount of the isotope decays to the half of its amount.
For the problem, when 1 half life transcur, the sample has a mass of:
425g / 2 = 212.5g
When 2 half lives transcur:
212.5g / 2 = 106.25g
3 half lives:
106.25/2 = 53.13g
And the amount that is found after 4 half lives is:
53.13/2 =
26.56gA _____ is an area prone to flooding.
A. basin
B. fault line
C. floodplain
D. desert
Answer:
c. floodplain
Explanation:
brainliest please!
Answer:
I think the answer is floodplain.
Explanation:
I hope this helps, have a blessed day.
A meander is _____.
A. an erosional feature that causes additional sediment to enter the river
B. the beginning of a mountain
C. a curve in a river
D. a depositional feature formed by moving water
How many mole ratios can be written for a chemical reaction involving four substances?
Answer:
12 and 20 moles ratios, respectively.
Explanation:
Note that the number of mole ratios you can write for a chemical reaction involving a total of n substances is (n)(n–1). Thus, for reactions involving four and five substances, you can write 12 and 20 moles ratios, respectively.
*** HOPE IT HELPS! :)
You pour 25.0 mL of 6.70 M NaOH stock solution into your beaker. How much water will you have if it is diluted to 3.40 M
solution?
If there are 3 moles of gas A, 4 moles of gas b and 5 moles of gas c I'm a mixture of gases and the pressure A is found to be 2.5 atm, what is the total pressure of the sample of gases
Answer:
Total pressure = 10 atm
Explanation:
The excersise can help to understant the concept of mole fraction
Mole fraction is defined as:
moles of gas / Total moles = pressure of that gas / Total pressure
Both can be summed.
Sum of moles of each gas in the mixture = Total moles
Sum of pressures of each gas in the mixture = Total pressure
Those, are laws for gases.
Total moles: 3 mol of gas A + 4 moles of gas B + 5 moles of C
= 12 total moles
Pressure of A is 2.5 atm.
We replace data at the mole fraction relation
moles of A / total moles = Pressure of A / Total pressure
3 moles / 12 moles = 2.5 atm / Total pressure
Total pressure = 2.5 atm / (3mol/12mol)
Total pressure = 10 atm
How is a water wave similar to a pendulum?
Answer:
side to side?
Explanation:
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.
A door is made of solid iron and this one-meter stick. How many kilojoules would it take to be to burn a hole 15 centimeters in diameter?
Answer:
The heat required, to burn a hole 15 cm in diameter through the iron door is 34,370.050 kJ
Explanation:
The information given on the door are;
The thickness of the door, t = One-meter
The diameter of the hole to be burnt out, d = 15 cm = 0.15 m
The latent heat of fusion of iron, [tex]H_f[/tex] = 247 kJ/kg
The density of iron, ρ = 7.874 g/cm³ = 7874 kg/m³
The volume of the iron to be melted off, V = π·d²/4 × t
∴ V = (π × 0.15²/4) × 1 ≈ 0.01767145867
The volume of the iron to be melted off, V ≈ 0.01767145867 m³
The mass of the iron to be melted off, m = ρ × V
∴ m = 7874 kg/m³ × 0.01767145867 m³ ≈ 139.145066 kg
The mass of the iron to be melted off, m ≈ 139.15 kg
The heat required, to melt the mass of iron at the melting point temperature and burn a hole 15 cm in diameter, ΔH, is given as follows;
ΔH = [tex]H_f[/tex] × m
∴ ΔH = 139.15 kg × 247 kJ/kg = 34,370,050 J = 34,370.050 kJ
The heat required, to burn a hole 15 cm in diameter through the iron door ΔH = 34,370.050 kJ.
_______ are the paths of objects around the sun.
Answer:
Orbit
Explanation:
when something makes a complete path around the sun it is called an orbit
What is the mass of Neon in a sign when the gas tubes have a total volume of 166 mL?
d c a b yfyefegyfyrgfyeerg
when you rub your sock on carpet then touch a door what happens? what are the charges doing?
The symbol for the hydronium ion is
ОН+
ОНЗО-
OH30+
ОН-
Please help
I’m to lazy can anyone help me please
Answer: what do i have to do to help.. ;-; like i need instructions and why are the words coverd off black??
;-;
Explanation:
Observations lead to questions. Good scientific questions need to be ___________.
straightforward
testable
inferred
spontaneous
Answer:
I think the answer would be 'testable'.
different between:Electrovalent bond and covalent bond
Explanation:
electrovalent bond covers single bond.
Covalent bond covers double or more bonds.
A gas is in a container with an initial volume of 2.50L, initial pressure of 1.34 atm, and initial temperature of 308 K. What would be the pressure if the gas was heated to 373 K and the volume decreased to 1.90 L? *Hint use the Combined Gas Law.
Answer: The pressure is 2.14 atm if the gas was heated to 373 K and the volume decreased to 1.90 L.
Explanation:
Given: [tex]V_{1} = 2.50 L[/tex], [tex]P_{1} = 1.34 atm[/tex], [tex]T_{1} = 308 K[/tex]
[tex]P_{2} = ?[/tex] , [tex]V_{2} = 1.90 L[/tex], [tex]T_{1} = 373 K[/tex]
Formula used to calculate the final pressure is as follows.
[tex]\frac{P_{1}V_{1}}{T_{1}} = \frac{P_{2}V_{2}}{T_{2}}[/tex]
Substitute the values into above formula as follows.
[tex]\frac{P_{1}V_{1}}{T_{1}} = \frac{P_{2}V_{2}}{T_{2}}\\\frac{1.34 atm \times 2.50 L}{308 K} = \frac{P_{2} \times 1.90 L}{373 K}\\P_{2} = \frac{1.34 atm \times 2.50 L \times 373}{308 K \times 1.90 L}\\= 2.14 atm[/tex]
Thus, we can conclude that the pressure is 2.14 atm if the gas was heated to 373 K and the volume decreased to 1.90 L.
binigyan ang isang liham ng pasasalamat at gagawin ko rin siya ng kabutihan sa ibang pagkakataon
Answer:
what language do you speak?
In this activity, you will be observing a reaction where copper and silver nitrate react to form copper (II) nitrate and silver.
What are the products of this reaction?
Answer:
Copper(II) nitrate and silver
Explanation:
2AgNO₃(aq ) + Cu (s) --> Cu(NO₃)₂(aq ) + 2Ag(s)
This can be called a redox reaction because silver nitrate is reduced and copper is oxidized. This can also be called a single replacement reaction because copper replaces silver in the substance silver nitrate.
In a tug of war, the team on the left pulls with a force of 430 N and the team on the right pulls with a force of 420 N. What is the net force on the rope?
A. 10 N to the right
B. 10 N to the left
C. 420 N to the right
D. 430 N to the left
Answor
c
Explanation:
Suppose Earth was tilted much less on its axis. What effect would this have on the planet? Please help me !
Answer:
If Earth was tilted much less on its axis, it would lead to minor changes in precipitation and temperatures as Earth moves slightly towards and away from the sun.
Explanation:
If a planet tilts more, it leads to colder winters and warmer summers. However, if a planet tilts less, it leads to less severe seasons that is and milder winters and cooler summers.
If Earth was tilted much less on its axis, it would lead to minor changes in precipitation and temperatures as Earth moves slightly towards and away from the sun.
What is the purpose of a buffer?
Answer: A buffer solution is a solution made to prevent the pH level of something from changing when you add a base or an acid to it. For example, if you put a buffer solution in a pool, and then you put chlorine in it, the chlorine's effect on the PH level will be suppressed.
WILL GIVE BRAINLIEST!!
Answer:
Option b which is n equal to 3
How much energy is needed to heat 2 kg of cooking oil with a specific heat capacity of 2000 from 20 to 120
Answer:
20KJ
Explanation:
We know that heat required to raise the temperature of substance is given by
thermal energy Q= mass(m) × specific heat capacity(c) × change in temperature.(ΔT)
Q = mcΔT
given data: mass m = 2kg , c = 2000j/Kg°C and ΔT = 120-20 =100°C
Therefore, Q = 2×2000×100 = 20000 J = 20KJ
Hence, 20KJ heat is required to to heat 2 kg of cooking oil with a specific heat capacity of 2000 from 20 to 120 [ Units have been assumed as per convenience)
An oxbow lake forms when _____.
A. workers construct a dam along a stream
B. lakes fill to overflowing
C. erosion removes all loose sediment along a river
D. deposited sediments separate a meander from the river
B. Lakes fill to overflowing
Which functional group does the molecule below contain
H
H-C-C
H
H
A. Carbonyl
B. Hydroxyl
Amino
D. Ether
The functional group to which the molecule belongs is the carbonyl group.
What is a functional group?A functional group refers to an atom, group of atoms or bond which is responsible for the chemical reactivity of a particular homologous series.
From the image of the molecule that has been shown in the question, the functional group to which the molecule belongs is the carbonyl group.
Learn more about carbonyl:https://brainly.com/question/21440134
#SPJ1
Answer:
A
Explanation:
got it right in app filler filler filler filler
Explain how the iron pipes change into rust?
The difference between a conjugate acid/base pair is
+
o the conjugate acid
o the conjugate base
O one proton
one OH-
Answer:
hola no ablo inglés porfavor
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