Answer:
There are needed 375mL of the 2.0M BaCl₂ solution completing to 500mL with water.
Explanation:
We can find with the volume and concentration of the barium chloride the moles of BaCl₂ required. With the moles and the concentration of our stock solution we can know the volume of the 2.0M BaCl₂ solution required as follows:
Moles required:
0.500L * (1.50mol / L) = 0.750 moles BaCl₂
Volume stock solution:
0.750 moles BaCl₂ * (1L / 2.0mol) = 0.375L
There are needed 375mL of the 2.0M BaCl₂ solution completing to 500mL with water.why does the atmosphere weigh so much
Answer:
Because the Earth's gravity acts on the atmosphere and holds it down, just as it does all other objects. The weight of the atmosphere is estimated to be about 5.75 quadrillion (5,750,000,000,000,000) tons. Air pressure is the "push" of the atmosphere on the Earth's surface.
Can someone please answer this?
Answer:
B) go look on the periodic table for the atomic number
Explanation:
The atomic number is how many protons is in an atom
Answer:
Either A or B
Explanation: Because I learned it on Edge. :)
what is my name?
chetana
ikshya
grishma
bhumika
puja
they're name of bunch of girls.
3 of 12
Assessment: Force and Motion CBA
Four students recorded the time it took them to walk to school from their homes as shown in the table
below.
Student
1
2
3
Motion of Four Students
Distance (meters) Time (minutes)
1,100
20
1,026
19
848
16
795
15
4
Which student had the greatest average speed?
Student 1
Student 2
Student 3
Student 4
1
2
3
4
5
6
7
8
9
10
Next
PLEASE HELP ME ASAP!!!!!!!!!!!!!
Which a balanced chemical equation ? O C 7 H 16 +5O 2 6CO 2 +4H 2 O OB C 7 H 16 +11O 2 7CO 2 +8H 2 O C 7 H 16 +14O 2 7CO 2 +5H 2 O OD . C 7 H 16 +22O 2 14CO 2 +16H 2 O
Answer: [tex]C_7H_{16}+11O_2\rightarrow 7CO_2+8H_2O[/tex]
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
The balanced chemical equation is:
[tex]C_7H_{16}+11O_2\rightarrow 7CO_2+8H_2O[/tex]
How many moles are in 100.0g of gold
An alpha particle is identical to a:
helium nucleus
hydrogen nucleus
high energy electron
radium nucleus
Answer: helium nucleus
what is a characteristic of a strong acid
Answer:
Strong acids have mostly ions in solution, therefore the bonds holding H and A together must be weak. Strong acids easily break apart into ions. Weak acids exist mostly as molecules with only a few ions in solution, therefore the bonds holding H and A together must be strong
Answer:
Bond Strength
Explanation:
Strong acids have mostly ions in solution, therefore the bonds holding H and A together must be weak. Strong acids easily break apart into ions. Weak acids exist mostly as molecules with only a few ions in solution, therefore the bonds holding H and A together must be strong.Aug 15, 2020
help? please and thank you! very much appreciated
Answer:
Option B is correct
Explanation:
The Formula of Nitrate is NO₃⁻
-TheUnknownScientist
2 HNO3(aq) + NO(g) → 3 NO2(g) + H2O(l) ΔG°rxn = ? ΔG°f (kJ/mol) -110.9 87.6 51.3 -237.1
Answer:
[tex]\Delta G_{rxn}=51.0kJ/mol[/tex]
Explanation:
Hello there!
In this case, according to the definition of the Gibbs free energy of reaction in terms of the Gibbs free energy of formation of the involved reactants and products, it is possible for us to compute it as shown below:
[tex]\Delta G_{rxn}=3\Delta _f G_{NO_2}+\Delta _f G_{H_2O}-2\Delta _f G_{HNO_3}-\Delta _f G_{NO}[/tex]
Thus, by plugging in the given data, it is possible to obtain:
[tex]\Delta G_{rxn}=3(51.3)+(-237.1)-2(-110.9)-(87.6)\\\\\Delta G_{rxn}=51.0kJ/mol[/tex]
Best regards!
The standard Gibbs free energy change (ΔG°rxn) for the reaction is 76.7 kJ/mol.
The balanced equation for the reaction is:
2 HNO₃(aq) + NO(g) → 3 NO₂(g) + H₂O(l)
The standard free energy change for a reaction ( ΔG0rxn) can be found out using the equation,
ΔG° = Σ ΔG°fproducts - Σ ΔGf° reactants
ΔG°rxn = ΔH°rxn - TΔS0rxn
∆H°rxn = change in enthalpy of reaction
∆S° = Change in entropy of reaction
T = Temperature ( 298 K )
ΔG°rxn = (3 × ΔG°f(NO₂(g)) + ΔG°f(H₂O(l))) - (2 × ΔG°f(HNO₃)aq)) + ΔG°f(NO(g)))
Substituting the given ΔG°f values:
ΔG°rxn = (3 × 51.3 kJ/mol) + (-237.1 kJ/mol) - (2 × (-110.9 kJ/mol)) + (87.6 kJ/mol)
ΔG°rxn = 153.9 kJ/mol - 237.1 kJ/mol + 221.8 kJ/mol + 87.6 kJ/mol
ΔG°rxn = 226.2 kJ/mol - 149.5 kJ/mol
ΔG°rxn = 76.7 kJ/mol
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How many moles of NaCl are found in 5.2L of a 0.75 M solution?
Answer 4.45 moles
Explanation:
Which phrase best describes an individual organ
Answer:
the answer is B
Explanation:
Select the correct answer.
John is riding a ski lift to the top of Wildcat Mountain. He removes his gloves and rapidly rubs his hands together to warm them up. What
happens when John rubs his hands?
O A. The skin on his hands rapidly conducts heat, similar to metal.
O B. He traps heat between his hands because skin is an insulator. IS
O C. The particles In his hands vibrate faster because of friction.
O D. Thermal energy moves from his fingertips to his palms.
O E. He simulates a fever that'll raise his core body temperature.
Answer:
Fairly certain it's C. The particles In his hands vibrate faster because of friction :)
Answer:
C
Explanation:
Helppppppppppppppppppppppppppppppppppppp
Answer:
0.67moles
Explanation:
The balanced equation of the chemical reaction given in this question is:
N2 + 3H2 → 2NH3
According to this equation, 3 moles of hydrogen gas (H2) produces 2 moles of ammonia gas (NH3)
Therefore, 1 mole of hydrogen gas (H2) will produce;
= 1 × 2/3
= 2/3
= 0.6666
= 0.67moles of ammonia (NH3)
The gas phase decomposition of phosphine at 120 °C
PH3(g)1/4 P4(g) + 3/2 H2(g)
is first order in PH3 with a rate constant of 1.80×10-2 s-1.
If the initial concentration of PH3 is 8.48×10-2 M, the concentration of PH3 will be 2.45×10-2 M after
s have passed.
Answer:
The decreasing in concentration occurs after 69.0s
Explanation:
A first order reaction follows the equation:
Ln [A] = -kt + ln[A]₀
Where [A] is the concentration of the reactant after time t
k is rate constant of the reaction
And [A]₀ is the initial concentration of the reactant
Replacing:
Ln 2.45x10⁻²M = -1.80x10⁻²s⁻¹*t + ln8.48x10⁻²
-3.709 = -1.80x10⁻²s⁻¹*t -2.467
-1.2416 = -1.80x10⁻²s⁻¹*t
69.0s = t
The decreasing in concentration occurs after 69.0s
Copper(Ii) Iodate + Potassium Carbonate = Potassium Iodate + copper(I)carbonate into a formula equation ?
Answer:
Cu(IO3)2 + K2CO3 → 2KIO3 + CuCO3
Why do silver and copper have similar properties?
(7th Grade science)
Answer:
They are both listed under group 11 on the periodic table and both are highly conductive of electricity
Explanation:
HOPE THIS HELPS ^^
What is the formula for pH?
Answer:
To calculate the pH of an aqueous solution you need to know the concentration of the hydronium ion in moles per liter (molarity). The pH is then calculated using the expression: pH = - log [H3O+].
Example: Find the pH of a 0.0025 M HCl solution.
i need to write a brief paragraph on why this lab is important, please help!! here is the question!
How can the properties of acids and bases be used to classify solutions?
Answer:
Acids and bases aqueous solutions will conduct electricity because they contain dissolved ions. Therefore acids and bases are electrolytes. strong acids and bases will be electrolytes. weak acids and bases will be weak electrolytes.
You are given three liquids. You know that one of them is a suspension, one is a solution with nonelectrolytes, and the other is a solution with electrolytes. Describe the process by which you would differentiate between the three.
Answer:
decant/ filter then decompose the electrolytes by electrolysis
Explanation:
Differentiation of suspension solution is done by filtering and differentiation of electrolyte and non-electrolyte solution is done by electrolysis process.
What is electrolysis process?Electrolysis process is used to decompose the any electrolyte present in any solution into their constitute ions towards the cathodes and anodes under the electric flow of current.
Process which is required to differentiate suspension solution is filtering, because in this solution suspended insoluble particles are present which get filtered. Now to differentiate between non electrolyte and electrolyte solution we will use the electrolysis process, as non electrolyte solution do not show any behavior in this.
Hence, we use filtering and electrolysis process for the differentiation.
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How is a sound wave transmitted? Please help me I have a test.
Answer: energy is transferred through vibration of air particles or particles of a solid through which the sound travels.
Answer:
Sound is transmitted by vibrating a object and the waves move through particles.
Explanation:
True or False: Only animals can move pollen from plant to plant.
A. True
B. False
i think false because of the wind or insects
Is heat a from of kinetic or potential energy?
Answer:
its made up of both but I would probably say kinetic
Explanation:
The substances below are listed by increasing specific heat capacity value. Starting at 30.0 °C, they each absorb 100 kJ of thermal energy. Which one do you expect to increase in temperature the most? (3 points)
a
Silver, 0.239 J/(g °C)
b
Aluminum, 0.921 J/(g °C)
c
Lithium, 3.56 J/(g °C)
d
Water, 4.184 J/(g °C)
Answer:
the answer is B
Explanation:
Calculate the pH for a 1.0 x 10-5 M solution of OH at 25°C.
pH = -log[H*), pOH = -log[OH-]
14 = pH + POH
0 pH = 11.00
0 pH = 9.00
0 pH = 6.00
0 pH = 3.00
Answer:
ph=9.00
Explanation:
Given 1.0x10^-15M of OH at 25c
first find Poh from Poh=-log[OH]
then Poh=-log[1.0x10^-5]
from above Ph=5
then find Ph from ph+poh =pw
where pw=14
so
ph+5=14
ph=9.00
The pH for a 1.0 x 10-5 M solution of OH at 25°C is 9.
What is pH?pH is a measure of acidity and basicity of aqueous solution. The range of pH goes from 0 - 14, with 7 being neutral. pH of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base.pH is the measure of the relative amount of free hydrogen and hydroxyl ions in aqueous or other solutions.In water pH + pOH=14
pH = 14 - pOH = 14 - 5 = 9
From definition, pOH = - log₁₀ [OH⁻]
Thus pOH = -log₁₀ (1 x 10⁻⁵)
= - (-5) = 5
pH + pOH = 14
pH = 14 - pOH
= 14 - 5 = 9
pH = 9
Hence, pH = 9 is the correct answer.
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A student weighs an empty flask and stopper and finds the mass to be 53.256 g. She then adds about 5 mL of an unknown liquid and heats the flask in a boiling water bath at 98.8°C. After all the liquid is vaporized, she removes the flask from the bath, stoppers it, and lets it cool. After it is cool, she momen- tarily removes the stopper, then replaces it and weighs the flask and condensed vapor, obtaining a mass of 53.780 g. The volume of the flask is known to be 231.1 mL. The absolute atmospheric pressure in the laboratory that day is 728 mm Hg. a. What was the pressure of the vapor in the flask in atm?
Answer:
a. The pressure in the flask open to the atmosphere during the vaporization of the unknown liquid is equal to the prevailing atmospheric pressure equivalent to 0.957734 atm
Explanation:
The mass of the empty flask and stopper, m = 53.256 g
The volume of the unknown liquid she adds = 5 mL
The temperature of the water in which she heats up the flask = 98.8 °C = 371.95 K
The mass of the flask and the condensed vapor = 53.780 g
The volume of the flask, V = 231.1 mL
The atmospheric pressure, P = 728 mm Hg
a. We note that the student stoppers the flask after all the liquid has evaporated. Therefore, given that the flask was open to the atmospheric pressure as the liquid evaporates, the pressure of the vapor in the flask is equal to the prevailing atmospheric pressure, or 728 mmHg
Using a calculator, 728 mm Hg is equivalent to 0.957734 atm.
What type of circuit has a broken path that does NOT let current flow through it?
A : Closed circuit
B: Open circut
C : Toggle
D : Switch
Answer:
B
Explanation:
Which of the following bonds is classified as a polar bond?
A K-CI
B Br-Br
C Si-F
D S-O
WILL MARK BRAINLIST
Answer:
the answer is b
Explanation:
the answer is b
Compound of KCl has a polar bond as there is a electronegativity difference between potassium and chlorine atoms.
What is a compound?
Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:
1)Molecular compounds where in atoms are joined by covalent bonds.
2) ionic compounds where atoms are joined by ionic bond.
3)Inter-metallic compounds where atoms are held by metallic bonds
4) co-ordination complexes where atoms are held by co-ordinate bonds.
They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.
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9. Why do bees pollinate flowers?
A. They want to get to food in the flower.
B. They want to make seeds.
C. They want to help the flowers reproduce.
D. They want protection.
Explanation: B.
Bees pollinate in order to sweeten their seed
Answer:
A
Explanation:
Bees make excellent pollinators because most of their lives is spent collecting pollen which acts as a protein to feed their offspring
