A balloon contains 7. 2 L of helium. The pressure is reduced to 2. 00 atm and the balloon expands to occupy a volume of 25. 1 L. What was the initial pressure exerted on the balloon?
Answer:
your answer should be 0.57 atm
This precipitation fell
as freezing rain.
Which of the
following BEST
describes why this
precipitation did not
fall as snow?
A. the air above the ground was too cold to support
snowfall
B. the precipitation obviously fell directly from the
clouds as icicles
C. the air above the ground was above freezing, the
surfaces on the ground were below freezing
D. there were no clouds above the ground so the
precipitation bubbled up out of the frozen ground by
Precipitation is the fall of the condensed product to the ground. The freezing rain occurred because the air above the ground was above freezing.
What is freezing rain?
Freezing rain is the form of precipitation that occurs when the rain droplets freeze upon contacting the ground surfaces. It is composed entirely of liquid water droplets.
Freezing rain occurred because there was not enough time for the water to freeze in a cloud, unlike the snow. Snow is another type of precipitation that forms when the temperature is low in the atmospheric surroundings.
Therefore, option C. the air above the ground surface was above freezing level explains the formation of freezing rain.
Learn more about freezing rain here:
https://brainly.com/question/1512270
#SPJ1
What is the importance of antacid in the body?
Answer:
The substances which neutralize the acids of the stomach are called antacids. Acidity in the stomach causes the sensation of heartburn, antacids are taken to relieve this sensation. They are taken orally to suppress the effects of acidity.
What is the concentration of an aqueous solution with a volume of
550 mL that contains 350 grams of iron (II) chloride (FeCl2)?
Answer:
Explanation:
The formula for concentration is C = n/V
Where C represents concentration in mol/L.
n represents moles in mol.
V respresents volume in L.
You have 550 mL, let's convert it to L (1000 mL= 1L)
550 mL / 1000 = 0.55 L
We got V and we need n. We can find n by this formula:
n = m/M
m represents mass in g.
M represents molar mass in g/mol.
We are given grams of iron (II) chloride (FeCl2)
Find the molar mass by the periodic table: 55.85 + (2*35.45) = 126.75 g/mol.
n = (350 g) / (126.75 g/mol) = 2.76134 mol
Back to our first formula: C = n / V
C = (2.76134 mol) / (0.55 L) = 5.0206 mol/L.
to 3 significant digits it's 5.02 mol/L, and that is how you find concentration.
How are acids described according to the bronsted-lowry definition?.
Answer:
an acid is a proton (H⁺) donor
Explanation:
hope this helps
pls nmark brainliest
A mother and two young children are found passed out in their apartment, where a space heater is on. Emergency medical technicians suspect carbon monoxide poisoning. Why is carbon monoxide dangerous
Answer:
ummm a I guess if I am wrong tell me
A solution has [H3O+] = 2.8x10-5 M. Use the ion product constant of water K. = [H30 - ) [OH-] to find the [OH-] of the solution. Express your answer to two significant figures.
Answer:
Approximately [tex]3.6 \times 10^{-10}\; {\rm M}[/tex], assuming that the solution is dilute and is at room temperature (such that [tex]K_\text{w} = 10^{-14}[/tex].)
Explanation:
Look up the ion product constant of water:
[tex]K_{\text{w}} \approx 10^{-14}[/tex].
In a dilute solution where water is the solvent, the product of [tex][{\rm {H_{3}O}^{+}}][/tex] and [tex][{\rm {OH}^{-}}][/tex] (concentration of [tex]\rm {H_{3}O}^{+}}[/tex] ions and [tex]{\rm {OH}^{-}}[/tex] ions) is constantly equal to [tex]K_{\text{w}}[/tex]. (The unit of both [tex][{\rm {H_{3}O}^{+}}]\![/tex] and [tex][{\rm {OH}^{-}}]\![/tex] need to be [tex]{\rm M}[/tex].) In other words:
[tex][{\rm {H_{3}O}^{+}}]\, [{\rm {OH}^{-}}] = K_{\text{w}}[/tex].
Rearrange this equation to find [tex][{\rm {OH}^{-}}][/tex] in terms of [tex]K_{\text{w}}[/tex] and [tex][{\rm {H_{3}O}^{+}}][/tex]:
[tex]\begin{aligned}[] [ {\rm OH^{-}} ] &= \frac{K_{\text{w}}}{[{\rm {H_{3}O}^{+}}]} \\ &= \frac{10^{-14}}{2.8 \times 10^{-5}} \\ &\approx 3.6 \times 10^{-10}\end{aligned}[/tex].
What is one thing that could have prevented the Chernobyl tragedy?
Answer: if the staff at Chernobyl had been better trained.
The Chernobyl series seems to suggest there were a number of ways the explosion could have been prevented. These include if the staff at Chernobyl had been better trained, if the Soviet government had learned from the lessons of the past and if they had not been so averse to spending money.
hydration and solvation which the solvent is water. what is solvation?
Answer:
Solvation is the interaction of a solvent with the dissolved solute—in the case of water, solvation is often referred to as hydration. Solvent polarity is the most important factor in determining how well it solvates a particular solute.
Explanation:
hope this helps :)
Which factor does not affect the rate of solubility?.
A solution of rubbing alcohol is 68.4 % (v/v) isopropanol in water. How many milliliters of isopropanol are in a 89.7 mL sample of the rubbing alcohol solution
Taking into account the definition of Volume to Volume Percentage (% V/V), 61.3548 mL of isopropanol are in a 89.7 mL sample of the rubbing alcohol solution.
Volume to Volume Percentage (% V/V)Volume to Volume Percentage (% V/V) is a measure of concentration that indicates the volume of solute per 100 volume units of solution.
In other words, the percentage %v/v indicates the volume of solute (in mL) that is dissolved in 100 mL of solution.
The %v/v of a solution is determined by the following expression, which is multiplied by 100 to express it as a percentage:
[tex]v/v=\frac{volume of solute (mL)}{volume of solution(mL)} x100[/tex]
Volume of isopropanol in the sampleIn this case, you know:
%v/v= 68.4 %volume of solute= ?volume of solution= 89.7 mLReplacing in the definition of %v/v:
[tex]68.4=\frac{volume of solute (mL)}{89.7 mL} x100[/tex]
Solving:
volume of solute= (68.4× 89.7 mL)÷ 100
volume of solute= 61.3548 mL
Finally, 61.3548 mL of isopropanol are in a 89.7 mL sample of the rubbing alcohol solution.
Learn more about Volume Percentage:
https://brainly.com/question/1713808
https://brainly.com/question/23847585
The mass spectrum of an organic compound shows the relative abundances of M to be 34.76% and M 1 to be 2.632%. Assuming the peaks are caused by C12 and C13 isotopes, determine the number of carbon atoms in the compound. The natural abundance of C12 is 98.93%, and the natural abundance of C13 is 1.07%.
The number of carbon atoms present in any compound is equal to seven.
How do we calculate the number of carbon atoms?Number of carbon atoms present in any compound will be calculated by using the following equation:
No. of Carbon atoms = Relative intensity of M+1 peak / Natural abundance of C13
Intensity of molecular peak = 34.76%
Intensity of M+1 peak = 2.632%
Relative intensity of M+1 peak = (100/34.76)×2.632 = 7.57%
Given that natural abundance of M+1 = 1.07%
On putting values on above equation, we get
No. of C atoms = 7.57 / 1.07 = 7.07 = 7 (approx)
Hence number of carbon atoms is 7.
To know more about mass spectrum, visit the below link:
https://brainly.com/question/17368088
#SPJ1
please help smart kids HHowhotwill a 2.3 L balloon have to get to expand to a volume of 400 L? Assume that the initial temperature of the balloon is 25 degrees C.
Answer:
51 579 C
Explanation:
I will assume the PRESSURE remains constant
then
V1 /T1 = V2/T2 T will be in Kelvin
25 C = 298.15 K
2.3 l / 298.15 K = 400 l / T2
solve for T2 = 51852.17 K = 51579 C
[tex]\huge\mathfrak\colorbox{white}{}[/tex]
Which of the following minerals effervesces (produces a bubbling, fizzing reaction) in hydrochloric acid? Group of answer choices gypsum quartz halite calcite
The minerals effervesce (produces a bubbling, fizzing reaction) in hydrochloric acid is calcite. The correct option is D, calcite.
What is calcite?Calcite is a mineral that is very hard, and highly reactive.
It is present in many colors, white, yellow, orange, red, green, and blue.
In Ancient Egypt, calcite was used to carve many things, such as bast, alabaster, etc.
Thus, the correct option is D, calcite.
Learn more about calcite
https://brainly.com/question/16855546
#SPJ1
Ocean salinity will vary with evaporation as well as with freezing and thawing. True or False?
True
False
Answer: true
Explanation:
Ocean salinity will vary with evaporation as well as with freezing and thawing. this statement is true.
What is Ocean salinity?Salinity, commonly known as saline water (also see soil salinity), is the degree of saltiness or the quantity of salt dispersed throughout a body of water. The standard units of measurement are grammes of salt per litre (g/L) or grammes per kilogramme (g/kg; the latter one is dimensionless therefore equal to ).
Salinity is a thermodynamic condition variable that, along with pressure and temperature, controls physical properties like the density also heat capacity of the water. Salinity plays a significant role in defining numerous facets of the chemical composition of natural waters as well as the biological processes within them. Ocean salinity will vary with evaporation as well as with freezing and thawing. this statement is true.
Therefore, ocean salinity will vary with evaporation as well as with freezing and thawing. this statement is true.
To know more about Ocean salinity, here:
https://brainly.com/question/2752734
#SPJ2
What laws do astronomers use to indirectly learn about stars?
Answer
Laws that are used by astronomers to learn about stars indirectly are as given below:-
Kirchhoff's First LawCassini's laws
A student measured and recorded the temperature of the liquid
inside a can of carbonated soft drink. He then poured the soft
drink from the can into a glass filled with ice. Gas bubbles
appeared on the sides of the glass and formed a layer of foam
as they rose to the top of the glass. The mixture gave off a sweet
odor. When the temperature of the soft drink and ice mixture
was measured, the temperature of the mixture was much lower
than the temperature previously recorded for the canned soft
drink. The student concluded a chemical change had taken
place.
Which statement provides the best evidence that the student's
conclusion is wrong?
Gas bubbles
appeared on the
sides of the glass.
No new substances
were formed.
There was a change
in temperature.
The mixture gave off
a sweet odor.
There is the change in temperature is the correct answer.
What is a carbonated soft drink?Carbonated beverages are drinks that include carbon dioxide dissolved in water.
It is given as the formation of bubbles and the odour will be concluding with the formation of the new product and thereby a chemical change. Whereas there was no chemical change if the temperature lowers down as the reason stands to be the formation of a mixture.
Hence, there is a change in temperature.
Learn more about carbonate soft drink here:
https://brainly.com/question/1757202
#SPJ1
A sample of carbon monoxide and oxygen gasses are
allowed to combust in a small flask. They reaction is
described by the following equation.
2CO (g) + O₂ (g) → 2CO2 (g)
After the reaction is complete, the pressure of CO₂ is 0.868
atm and the temperature is 35.0 °C in a 500.0 mL flask. How
many moles of CO2 were produced assuming that the
reaction went to completion?
Answer:
.0172 mole of CO2
Explanation:
PV = nR T n = number of moles V = .5 liter
R = gas constant = .082057 L atm/(k mole)
T needs to be in Kelvin = C + 273.15
.868 * .5 = n * .082057 * ( 35 + 273.15)
n = .0172 moles
18. 0mols of sodium reacts with excess chlorine. How many
grams of sodium chloride form?
please help
Answer:
I think the answer is 0 because 0 mols of sodium react
Explanation:
How many moles are there of a 2 M solution with a volume of 17.95 liters?
Answer:How many moles are there of a 2 M solution with a volume of 17.95 liters = 35.9 moles !
Explanation: The formula for calculating the molarity of the solution is expressed as Molarity= mole/volume
Molarity = 2 M
Volume=17.95L
Substitute the given parameters into the formula … and you get
mole=molarity x volume
Mole=2M x 17.95L
Mole=35.9moles
moles of the solution is 35.9 moles
Hope this helps if so mark Brainalist thanks
Can someone please help me? :(
nuclear energy, once used up it can not be used again
What mass of Ca(OH)2 is contained in 1500 mL of 0.0250 M Ca(OH)2 solution?
Your answer:
1.85 g
2.34 g
2.78 g
3.17 g
We need moles of Ca(OH)_2
Molarity=Moles/Volume in L0.025=Moles/1.5Moles=1.5(0.025)Moles=0.0375molMolar mass of Ca(OH)_2=74g/mol
Now
Mass=Molar mass×MolesMass=0.0375×74Mass=2.77gOption C
The mass of Ca(OH)₂ in the given solution is approximately 2.78 grams, which corresponds to option C) 2.78 g.
Given: Volume = 1500 mL, Concentration (Molarity) = 0.0250 M, and Compound = Ca(OH)₂ .
First, convert mL to L: Volume = 1500 mL × (1 L / 1000 mL) = 1.5 L.
Use the formula for calculating the number of moles: Moles = Concentration × Volume.
Moles = 0.0250 mol/L × 1.5 L = 0.0375 mol.
The molar mass of Ca(OH)₂ can be calculated:
Ca(OH)₂ molar mass = (1 * atomic mass of Ca) + (2 * atomic mass of O) + (2 * atomic mass of H)
= (1 * 40.08 g/mol) + (2 * 16.00 g/mol) + (2 * 1.01 g/mol)
= 74.09 g/mol.
Now, calculate the mass using the calculated moles and molar mass:
Mass = Moles × Molar mass
Mass = 0.0375 mol × 74.09 g/mol = 2.78 g.
Therefore, the mass of Ca(OH)₂ in the given solution is approximately 2.78 grams, which corresponds to option C) 2.78 g.
To learn more about molar mass here
https://brainly.com/question/31545539
#SPJ3
The complete question is:
What mass of Ca(OH)₂ is contained in 1500 mL of 0.0250 M Ca(OH)₂ solution?
A) 1.85 g
B) 2.34 g
C) 2.78 g
D) 3.17 g
What is the power of a food processor that can perform 1,350 joules of work in 15 seconds
How many spaces away from a Noble gas are the following elements?
a. Na, Li, K and Cs?
Answer:
Na - 1 away from neon
Li - 1 away from helium
K - 1 away from argon
Cs - 1 away from xenon
Explanation:
We see this trend as group 1A elements are 1 away from noble gases and hence, have a valency of 1
Copper(II) sulfate is an example of a substance that dissolves in water. Copper(II) sulfate is an ionic compound with the chemical formula CuSO4 and when it is added to water it dissociates into Cu2+ and SO42− ions. Students used both copper sulfate crystals and copper sulfate powder in this experiment on the rate of dissolving. Choose one statement that represents a valid conclusion based on the student data?
A) The smaller the solute particles the more energy they have. Increased energy results in shorted dissolving time.
B) A given quantity of solute dissolves faster when it is ground into small particles because more surface area is exposed.
C) As the water temperature increased, the copper sulfate crystals dissolved faster but there was little change for the powdered form.
D) Agitation of the powder allows fresh solvent molecules to continually be in contact with the solute
As the water temperature increased, the copper sulfate crystals dissolved faster but there was little change for the powdered form.
Does increase in temperature make solids to dissolve faster?Increasing the temperature of a solvent can increase the rate at which a solid dissolves. This is because an increase in temperature causes the solvent molecules to move more rapidly, which in turn increases their kinetic energy and ability to interact with the solute particles.
As a result, the solute particles are more likely to break free from their crystal lattice and become surrounded by the solvent molecules.
Learn more about dissolution:https://brainly.com/question/23851972
#SPJ1
Answer:
A given quantity of solute dissolves faster when it is ground into small particles because more surface area is exposed.
Explanation:
The more surface area of a solute that is exposed, the faster the solute will dissolve. Like sugar for an example, sugar cubes take longer to dissolve as compared to regular ground up sugar.
And I took the test and got this right!
Which gas law relates pressure and volume?
- Is there a direct or indirect relationship?
- What variable is held constant?
Gas laws are the relation between pressure, volume, and temperature of the gas. The relation between the pressure and the volume of the gas is given by Boyle's law.
What is Boyle's law?Boyle's law gives the relation between the pressure and the volume of the gas and states that the pressure is in the inverse relationship with the volume of the gas.
When the pressure of the gas is increased the volume of the gas decreases, similarly the decreased pressure of gas results in an increased volume of gas.
Boyle's law is given as,
[tex]\rm V = \rm constant (\dfrac{1}{P})[/tex]
and,
[tex]\rm P_{1}V_{1} = \rm P_{2}V_{2}[/tex]
Boyle's law is only true if the moles of the gas (n) and the temperature (T) of the gaseous system are constant.
Therefore, pressure and volume are in indirect relation and the moles and the temperature are constant in Boyle's law.
Learn more about Boyle's law here:
https://brainly.com/question/1437490
#SPJ1
A sample of nitrogen gas reacts with an excess of hydrogen gas to give an actual yield of 20.05 g NH3. The theoretical yield is 26.46g.
What is the percent yield for this reaction?
Round to two decimal places
N2(g) + 3H2(g)+2 NH3 (g)
Answer: 75.77%
Explanation:
Percent yield = (actual yield)/(theoretical yield) = 20.05 / 26.46 * 100 = 75.77%
Hydrazine (N_2H_4) decomposes to produce N_2 and NH_3. How many molecules of NH_3 will be formed if 60 molecules of N_2H_4 decompose into N_2 and NH_3
80 molecules of [tex]NH_{3}[/tex] will be formed if 60 molecules of [tex]N_{2}H_{4}[/tex] decomposes into [tex]N_{2}[/tex] and [tex]NH_{3}[/tex]
What are molecules?The smallest particle of a substance has all of the physical and chemical properties of that substance. Molecules are made up of one or more atoms.
Just balance the reaction:
[tex]3N_{2}H_{4}\to N_{2}+4NH_{3}[/tex]
Now you can see that every 3 molecules of [tex]N_{2}H_{4}[/tex]4 molecules of [tex]NH_{3}[/tex].
For 60molecules of [tex]N_{2}H_{4}[/tex] we scale up these numbers by a factor of 60/3 = 20.
Therefore 4x20 = 80 molecules of [tex]NH_{3}[/tex] are formed.
Learn more about molecules here:
https://brainly.com/question/19922822
#SPJ1
According to LOCO mass, the mass of reactants and products are what?
Answer:
Equal
Explanation:
According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.
Which enzyme of the citric acid cycle most closely resembles the pyruvate dehydrogenase complex in terms of its structure, organization, and the reaction it performs
Answer:
The α-ketoglutarate dehydrogenase enzyme is structurally and functionally homologous to the pyruvate dehydrogenase complex.
hope it helps