Answer:
0.0562 moles
Explanation:
Based on the H-H equation, for the HF buffer:
pH = pKa + log [F⁻] / [HF]
Where pH is the pH of the buffer = 3.630
pKa is pKa of HF buffer: 3.17
And [] could be taken as the moles of each reactant
3.630 = 3.17 + log [F⁻] / [HF]
0.46 = log [F⁻] / [HF]
2.884 = [F⁻] / [HF] (1)
The initial moles of HF are:
0.250L * (0.303mol / L) = 0.07575 moles
The HF reacts with NaOH as follows:
HF + NaOH → NaF + H₂O
That means the moles of HF will be the initial moles of HF - Moles NaOH
And moles NaF = F⁻ = Moles of NaOH added
That means:
0.07575 moles = [F⁻] +[HF] (2)
Replacing (2) in (1):
2.884 = [F⁻] / 0.07575 moles - [F⁻]
0.218 - 2.884[F⁻] = [F⁻]
0.218 = 3.884[F⁻]
[F⁻] = 0.0562 moles
That means the moles of NaOH that must be added are:
0.0562 molesCompound X meits at 801°C and is a good electrical conductor when dissolved in water.
Compound Y boils at 77°C. is insoluble in water and is a non-conductor of electricity.
Which type of bonding is present in X and in Y?
Answer:
I'm sorry but I cant answer.
Compound X meits at 801°C and is a good electrical conductor when dissolved in water. Compound Y boils at 77°C. is insoluble in water and is a non-conductor of electricity. Compound X is ionic bonding and compound y is covalent bonding.
What is ionic bonding ?The main interaction in ionic compounds is ionic bonding, a type of chemical bonding that involves the electrostatic attraction between two atoms or ions with dramatically differing electronegativities.
The sharing of electrons between two or more atoms forms a covalent connection. When two or more ions join in contact, they can create ionic bonds that are held together by charge differences.
In most cases, ionic compounds are created when a metal reacts with a nonmetal (or a polyatomic ion). The reaction between two nonmetals produces covalent compounds. Binary compounds containing hydrogen are typically covalent compounds since hydrogen is a nonmetal.
Thus, Compound X is ionic bonding and compound y is covalent bonding.
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How kids today make slime and why each ingredient is used. What does each ingredient do and what happens if you change how much is used?
Answer:
Find the steps and explanation below.
Explanation:
A. Kids make slime following these basic steps;
1. In a bowl, is 1/4 cup of water is added to 1 oz. of glue. Add coloring if you wish to.
2. 1/4 cup of Borax solution, also known as Sodium Tetraborate is added to the mixture and gradually stirred.
3. The mixture is kneaded with the hands to ensure a smooth consistency.
4. Water remnants are discarded and the slime is stored in a plastic bag and kept in the fridge.
B.
What each ingredient does
Polyvinyl acetate present in the glue acts as a liquid polymer.
Borax binds the liquid polymers together.
Water eases the mixing process
C.
If lesser ingredients are used, the slime will not have its characteristic slimy nature. If excess of the ingredients are used, the slime becomes very sticky.
the difference between objects that are sources of light and objects that reflect light.
Answer:
Explanation:
sun is the main source while the other object reflect light on the sun
true or false : A precipitate is formed when two liquids are combined and a solid compound comes out
Answer:
true I think ?38363849472
Answer:
true
Explanation:
Which type of cell would you expect to contain large amounts of mitochondria?
fat cells
muscle cells
liver cells
skin cells
muscle cells hope it helps
The last question i need help on and can you explain please? On D
Answer:
speed
Explanation:
Acceleration means an increase in the rate or speed of something.
Answer:
d) 25 m/s²
Explanation:
[tex]\boxed{F = ma}[/tex]
where F= force (N), m= mass (kg), a= acceleration (m/s²)
Net force
= 125 -75
= 50 N
(This is found in part a)
Given that the mass is 2kg, m=2.
F= ma
50= 2a
a= 50 ÷2
a= 25 m/s²
What type of chemical reaction is
2Al(s) + + 3Cl2(g) – 2AlCl3(s)
Answer:
It's a redox reaction.
Mars is red due to red soil rich in iron oxide (rust). Is the oxidation of soil to rust a PHYSICAL or CHEMICAL change How do you know?
Calculate the number of Oxygen atoms in Imole of 02
Answer:
two oxygen atoms
One mole of oxygen gas, which has the formula O2, has a mass of 32 g and contains 6.02 X 1023 molecules of oxygen but 12.04 X 1023 (2 X 6.02 X 1023) atoms, because each molecule of oxygen contains two oxygen atoms.
Explanation:
Which of the following is a homogeneous mixture?
A. beef stew
B. melting
C. rusting
D. cutting
Answer:
B. Melting
Explanation: Process of elimination
give brainliest pls <3
25 grams of methane (CH4) is placed inside a constant volume colorimeter. After the fuel is burned, the temperature rises by 45 degrees Celsius. If the heat capacity of the calorimeter is 5.57 kJ/C, what is the heat released?
An s w e r:
Explanation:
A tank consists of a gaseous mixture of 3.83 g of triselenium diiodide, 2.62 g of ammonium telluride, and 1.82 g of iridium (i) sulfate. What is the partial pressure in atm of ammonium telluride if the total pressure in the tank is 2.795 atm?
Answer: The partial pressure in atm of ammonium telluride is 1.48 atm
Explanation:
According to Raoult's law, the partail pressure of a component at a given temperature is equal to the mole fraction of that component multiplied by the total pressure
[tex]p_A=x\times p_{total}[/tex]
where, x = mole fraction
[tex]p_A[/tex] = partial pressure of A
[tex]p_{total}[/tex] = total pressure
[tex]x_{\text {ammonium telluride}}=\frac{\text {moles of ammonium telluride}}{\text {total moles}}[/tex],
[tex]x_{\text {ammonium telluride}}=\frac{\frac{2.62g}{164g/mol}}{\frac{2.62g}{164g/mol}+\frac{3.83g}{333g/mol}+\frac{1.82g}{673g/mol}}=0.53[/tex]
[tex]p_{\text {ammonium telluride}}=0.53\times 2.795atm=1.481atm[/tex]
Thus the partial pressure in atm of ammonium telluride is 1.48 atm
Photosynthesis is an example of an __
process.
9.32 L of pentane reacts with 36.4 L of oxygen. how many liters of carbon dioxide are formed?
Answer:
22.75 L CO2
Explanation:
Balance the Equation
C5H12 + O2 ==> CO2 + H2O Balance the Carbons
C5H12 + O2 ==> 5CO2 + H2O Now balance the Hydrogens
C5H12 + O2 ==> 5CO2 + 6H2O Now count up the oxygens on the right.
5*O2 + 6O ==> 10 O + 6 O ===> 16 Oxygens.
You have 2 on the left. You have to multiply the oxygens by 8
C5H12 + 8O2 ==> 5CO2 + 6 H2O
The equation is now balanced.
Now find out how much oxygen is needed to burn 9.32 L of Pentane
1 Liter Pentane / 8 Liters Oxygen = 9.32 L Pentane / x Cross multiply
x = 8 * 9.32
x = 74.56
Read this next sentence very carefully. You need 74.56 Liters of oxygen to burn all the pentane you have. There's not that much there. You only have 36.4 Liters of Oxygen. Some of the pentane won't get burned. Consequently there will be a shortage of CO2 as well.
Find out the number of Liters of Pentane that will be burned up.
1 / x = 8 / 36.4 Cross multiply
8x = 36.4 Divide by 8
8x/8 = 36.4/8
x = 4.55 Liters of Pentane will be used up.
Find the number of Liters of CO2
For every Liter of Pentane, 5 Liters of CO2 will be produced.
1/5 = 4.55/x Cross Multiply
x = 5 * 4.55
x = 22.75
what is gold on the periodic table of element
Answer:
Gold is element 79 and its symbol is Au.
What happens to the energy of gas particles when an elastic collision takes place?
Select one:
a.The more massive gas particle gains energy
b.The least massive gas particle looses energy
c.The more massive gas particle looses energy
d.No energy is exchanged between the gas particles
Answer:
the answer is D
Explanation:
When the elastic collision happens the particles energy does not change. There is no loss or gain of energy due to the elastic collision.
The energy of gas particles when an elastic collision takes place then "No energy is exchanged between the gas particles"
What is elastic collision?A collision between two bodies that would be elastic occurs when their combined kinetic energy stays constant.
What is energy?Energy is the ability to do tasks. It can exist in various forms, including potential, kinetic, thermal, electrical, chemical, and nuclear.
When two objects collide, there was no net loss of kinetic energy across the system. This is known as an elastic collision. In elastic collisions, momentum, as well as kinetic energy would both be conserved.
Therefore the correct answer will be option (d)
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Plants are able to grow toward the light due to the process known as phototropism. This process takes place inside the plant. Is i Behavioral,structural,or Physiological
Answer:
Physiological
Explanation:
The process whereby plants respond and grow towards light is a physiological process.
Physiological processes are life-sustaining processes that require the combined efforts of cells, tissues, organs, and or systems along with that of biomolecules in the body.
The response of plants to light requires the efforts of a hormone that triggers the rapid mitotic division of cells of tissues/organs that are directly opposite the light source. Thus, the faster rate of division of these cells as compared to the cells of tissues/organs that are directly in contact with light leads to the plant's tissues/organs bending towards the light.
which of these plants make the enviroment pleasant
a.sandalwood b.basil c.brahmi
Sandalwood
Explanation:
this is the answer please mark me as brainleist
What is the pH of 0.12M HNO3
Answer:
pH= 0.92
Explanation:
HNO3-> H^+ +NO3^-
HNO3 is a strong acid, so it fully dissociates
[HNO3] = 0.12M [H^+] = 0.12M
pH= -log[H^+]
pH=-log[.12] = 0.92
pH = 0.92
Which of the following would cause entropy to decrease?
A. CO2(g) → C02()
B. CO2(s) + CO2()
C. CO2() + CO2(9)
D. CO2(s) → C02(9)
The change that would cause entropy to decrease is CO2 gas changing to solid:
CO2(g) → C02(s)What is entropy?Entropy refers to the degree of randomness of a substance.
The higher the degree of randomness the higher the entropy value of that substance.
Entropy increases with increase in temperature as particles of substances gain more kinetic energy.
However, lowering temperature decreases entropy values.
The change from gas to liquid or solid involves lowering of temperature.
Therefore, the change that would cause entropy to decrease is CO2 gas changing to solid.
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Plz help fast, I will give brainliest!
Answer:
Its the second choice
Explanation:
If you were dividing a recipe in half, which of the following would be the most difficult to scale? OA. One egg OB. A cup of milk Oc. Three medium apples OD. A pint of heavy cream th Reset Next
1.Which type of text structure describes events in sequential order? A.sequence B.Cause and Effect. C. Problem And Solution. D. Compare and Contrast
2.This type of writing considers similarities and differences
A.Discripsion B.Compare and Contrast C. Sequence. D.Cause and Effect
3.in this type of writing,the reader will see words/phrases such as cause,as a result of,and due to.
A.Cause and Effect
B.Promlem and Solution
C.Order And Sequence
D.Compare And Contrast
Answer:
1 would be a. sequence
2 would be b. compare and contrast
3 would be a. cause and effect
brainley.
How is Earths crust recycled?
I think it's the last one
(and I'm so sorry if I'm wrong)
Answer:
The answer is D
Explanation:
The rest of them are not cycles.
What happened during the fusion reaction shown?
Answer:
the answer to this question B. Two H nuclei that fused into one He necleus
Explanation:
Two hydrogen atoms fused to one helium molecule, hence option B is correct.
What is fusion?Fusion is defined as a process in which two or more atomic nuclei unite to create new atomic and subatomic particles. Heat, which is produced when two atoms fuse, is the key to generating energy. Similar to how nuclear fission produces energy, this heat can be utilized to warm water, produce steam, and turn turbines to produce electricity.
In the core of the Sun, hydrogen is being converted to helium. This phenomenon is known as nuclear fusion. Fusion is what powers both the sun and the stars. One example of this kind of reaction is when two hydrogen atoms combine to form a helium atom. During the process, a portion of the hydrogen's mass is converted into energy.
Thus, two hydrogen atoms fused to one helium molecule, hence option B is correct.
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The mass of an atom may be found by adding the
O protons and neutrons
O molecules
o electrons and protons
O atoms
Answer:
protons and neutrons
Explanation:
How many Carbon atoms are shown in the reactants? How many C atoms are shown in the products?
Answer:
Q) How many Carbon atoms are shown in the reactants
Ans) The reactants have one carbon atom
Q) How many C atoms are shown in the products?
Ans) there is one atom on the product side
How many particles are in 1 mole of CO2?
can someone help me with this? thanks
Answer:
1 mole of lithium is 7 grams. we know this from it's relative molecular mass.
if 1 mole is 7 grams then x moles is 0.56 grams
we can equate them by saying (1/x)=(7/0.56)
after cross multiplying, we get 7x=0.56, x will be equals to 0.56/7
x=0.08 grams
0.08 mole is your answer
Answer:
we have
1 mole of li =7g
now
5.6×10^-1g of li =1mole/7g×5.6×10^-1 g=0.08mole
List as many things as you can see in the picture below
Abiotic (Non-Living)___________Biotic (Living)
__________________ ................ ___________________ __________________ ................ ___________________
___________________ ___________________