How many moles of silver atoms are in 3.88x10^20 atoms of silver
Answer:
100
ddExplanation:
WHAT IS THE PERCENT BY VOLUME OF ETHANOL IN A SOLUTION THAT CONTAINS 35 mL ETHANOL IN 115 mL OF WATER?
NaCl is purified by adding HCl to a saturated solution of NaCl (317 g/L). Will pure NaCl precipitate when 10mL of 13.0 M HCl is added to 0.2 L of saturated solution?
Answer:
Yes, pure NaCl will precipitate out of the solution
Explanation:
The parameters of the NaCl solution and HCl mixture are;
The saturation of the NaCl solution = Saturated solution
The mass concentration of the NaCl solution = 317 g/L
The volume of the HCl added = 10 mL
The concentration of the HCl added = 13.0 M HCl
The volume of the saturated NaCl solution = 0.2 L
The molar mass of NaCl = 58.44 g/mol
The number of moles of NaCl per liter = (317 g/L)/(58.44 g/mol) = 7925/1461 moles ≈ 5.42 moles
The ionization of the molecules in solution are;
HCl (aq) + H₂O (l) → H₃O⁺ (aq) + Cl⁻ (aq)
NaCl (s) ↔ Na⁺ (aq) + Cl⁻ (aq)
The number of moles of the Cl⁻ ion from the HCl is 13 moles per liter, the number of moles of Cl⁻ ion from the saturated solution of NaCl is approximately 5.42 moles, therefore, ionic product I.P. of the solution of Cl⁻ ions is larger than the solubility product of the solution, [tex]K_{sp}[/tex] of the NaCl and according to Le C h a t e l i e r's principle, NaCl will precipitate out of the solution
what is a climax community? no plagiarism.
Answer:
In scientific ecology, climax community or climatic climax community is a historic term for a boreal forest community of plants, animals, and fungi which, through the process of ecological succession in the development of vegetation in an area over time, have reached a steady state.
Explanation:
Molar Concentration of H2O+ lons
in Four Solutions
Solution Molar Concentration
of H3O+ lon
(M)
A 0.1
B 0.01
с 0.001
D I’m 0.0001
Which solution has the highest pH?
Answer:
d
Explanation:
because it’s moving the most spots to the left
The acidity or alkalinity of a solution depends upon its hydronium ion concentration and hydroxide ion concentration. Here among the given solutions, the solution D has the highest pH. The correct option is D.
What is pH?The pH of a solution is defined as the negative logarithm to the base 10 of the value of the hydronium ion concentration in moles per litre. The pH scale is introduced by the scientist Sorensen. It is more easy to express the concentration of H₃O⁺ using this method.
The equation used to calculate the pH of the solution is given as:
pH = -log[H₃O⁺]
For 0.1 M
pH = -log[0.1] = 1
For 0.01 M
pH = -log[0.01] = 2
For 0.001 M
pH = -log[0.001] = 3
For 0.0001 M
pH = -log[0.0001] = 4
So solution D has the highest pH which is 4.
Thus the correct option is D.
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How many electrons does potassium, shown above, need to gain or lose to become stable?
Group of answer choices
gain 2
gain 1
lose 1
lose 2
Answer:
It would tend to lose two electrons and form a +2 ion. Potassium is in the first column and therefore has 1 electron in its outermost shell. It would tend to lose one electron and form a +1 ion.
Which describes the path of energy that a gas powered car uses to drive along a road?
A. nuclear energy to light energy to electrical energy
B. chemical energy to heat energy to mechanical energy
C. mechanical energy to electrical energy to light energy
D. gravitational energy to kinetic energy to electrical energy
Answer:
mechanical energy to electrical energy to light energy
Can someone help me with this please?
When you mix two substances, the heat gained by one substance is equal to the heat lost by the other substance. Suppose you place 125 g of aluminum in a calorimeter with 1,000 g of water. The water changes temperature by 2 °C and the aluminum changes temperature by –74.95 °C. Water has a known specific heat capacity of 4.184 J/g °C. Use the specific heat equation to find out how much heat energy the water gained (q). Assume that the heat energy gained by the water is equal to the heat energy lost by the aluminum. Use the specific heat equation to solve for the specific heat of aluminum. (Hint: Because heat energy is lost, the value of q is negative.)
From the calculation, the specific heat capacity of the aluminum is 9.5 * 10^-5 J/g °C
What is specific heat capacity?The specific heat capacity refers to the heat that is required to raise the temperature of a body by 1K. The heat gained by the water is equal to the heat energy lost by the aluminum hence the negative sign.
Thus;
-(125 * c * –74.95) = 1,000 g * 4.184 * 2
c = 1,000 g * 4.184 * 2/125 * 74.95
c = 8368/9368.75
c= 9.5 * 10^-5 J/g °C
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238
U
92
+
Th
90
4
He
2
When radioactive uranium, or U-238, decays it emits an alpha particle and produces a nuclide of thorium. According to the nuclear
equation, what is the mass of the thorium produced?
A)
234
B)
238
C)
242
D)
244
Answer:
c) 242
Explanation:
you subtract 238-92= 146 then you add 146+90+4+2 that will give you 242
What type of reaction is the one shown above?
Answer:
.D you have any idea
Explanation:
Sana makatulong
examine the diagram of the cell which or general is marked with an X help
Answer:
I'm pretty sure it's the cell membrane
A(n) ____________________ has a rectangular shape and contains a cell wall, chloroplasts, and one large vacuole.
Which is evidence of climate-forced sea level rise submerging of low islands and coastlines decreased temperature of oceans temperature changes for surface currents increased carbon dioxide in the atmosphere
Answer: Ocean rise?
Explanation:
Answer:
submerging of low islands and coast lines
Explanation:
earth science climate change unit test
The net force of an object describes…
- The force that balances out the force of gravity
- All the forces in the same direction
Answer:
The vector sum of all forces that act upon an object
Which is a problem with using wind turbines to produce energy?
WA. Wind turbines are efficient only in certain areas.
A.
O C. Wind turbines produce a large amount of energy.
D. Wind turbines create a large amount of pollution.
B. Wind turbines occupy a small area of land.
Answer:
they are only efficient in certain areas
Explanation:
Wind turbine are efficient only in certain areas it is a problem with using wind turbines to produce energy.
What is Wind Turbine?Wind turbine convert the wind energy into the electricity. It is a power generating device that converts the kinetic energy in to electrical energy.
Now lets check all option one by one:
Option (A): Wind turbines are efficient only in certain areas it is a problem with using wind turbines to produce energy because the flow of air from areas of high pressure towards the lower pressure.
So, it is correct option.
Option (B): Wind turbines occupy a lot of space to work.
So, it is incorrect option.
Option (C): Wind turbines produce a large amount of energy is not a problem.
So, it is incorrect option.
Option (D): Wind turbines does not create a pollution or it does not pollute the air or water.
So, it is incorrect option.
Thus, we can say that Wind turbines are efficient only in certain areas it is a problem with using wind turbines to produce energy because the flow of air from areas of high pressure towards the lower pressure.
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The following dot plot represents the litter sizes of a random sample of labrador retrievers.
Calculate the mean, median, and mode for this set of data.
Calculate the range, interquartile range, and mean absolute deviation (rounded to the nearest hundredth) for this set of data. For the mean absolute deviation, do not round the mean.
Make two inferences about the litter size of labrador retrievers.
Answer:
12
Explanation:so the mean deviation is for the square and the square is for you so you keep the square and add it.
Answer:
1. mean: 7.78 median: 8 mode: 7
2. range: 9 interquartile range: 2 MAD: 4.5367
3. The range is about 4 times bigger than the interquartile range. The mean is around double the MAD.
Explanation:
Which of the following best describes the distribution of the world’s food supply? Select all that apply.
Still unevenly distributed leaving millions starving to death.
Quickly changing to be evenly distribute based on humanitarian efforts.
Slowly changing to be slightly more evenly distributed based on humanitarian efforts.
Evenly distributed throughout the population of the world now.
Answer: It would be A and C
Explanation: I did the test and got it right. Hope this helps!
Answer:
A + C
Explanation:
ur an amazing person have a great day :3
quote for today : ~dont trust anyone to much remeber the devil was once angle
The first law of thermodynamics is observed when
Answer:
Explanation:
The first law of Thermodynamics is known as Conservation because it explains that energy is always maintained within a closed system and cannot be created or destroyed. Therefore, this is observed when there is no longer change in temperature in a system. Mainly because the energy is not being transferred to and from another system. Without this transfer of energy, the energy itself gets conserved within the system and the temperature no longer fluctuates.
Zinc chloride + Magnesium →
Answer:
im assuming you need the balanced equation
Explanation:
Zn + MgCl2 = ZnCl2 + Mg
Answer:
it will mgcl2 + zn
Explanation:
Mg will replace zn from its salt solution
to form mgcl2
hope it helps
Is PCI3 a good conductor?
Answer:
Since the ions cannot move, ionic solids are non-conductors of electricity. When the solid is melted to a liquid, however, the ions are free to migrate. Therefore, ionic liquids are good conductors of electric current. A conductor is a substance capable of transmitting electricity and/or heat.
Explanation:
:)
No, [tex]PCI_3[/tex] is not a good conductor.
What is [tex]PCI_3[/tex]?Phosphorus trichloride is an inorganic compound with the chemical formula PCl3. A colourless liquid when pure, is an important industrial chemical, being used for the manufacture of phosphates and other organophosphorus compounds.
The liquid does not conduct electricity because of the lack of ions or mobile electrons.
Hence, no, [tex]PCI_3[/tex] is not a good conductor.
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What type of music do people like
Answer:
pop, emotional, heart touching, freestyle and rap music is what I LOVE!!!!!
Calculate the pH of a 0.002M acetic acid solution if it is 2.3% ionised at this dilution, ka=1.8×10^-5.
Answer:
3.11 is the pH of the solution
Explanation:
The ionised form of the acetic acid is the acetate ion. To solve this problem we need to solve H-H equation:
pH = pKa + log [A⁻] / [HA]
Where pH is the pH of the buffer
pKa = -log Ka = 4.74
[A⁻] = Concentration of acetate ion = 0.002M * 2.3% = 4.6x10⁻⁵M
[HA] = Concentration of acetic acid = 0.002M *(100-2.3)% = 0.001954M
Replacing:
pH = 4.74 + log [4.6x10⁻⁵M] / [0.001954M]
pH = 3.11 is the pH of the solution
determine the kinetic energy of an 833.0 kg roller coaster car moving at a speed of 20.0 m/s
Answer:
166,600J
Explanation:
Kinetic energy (K.E), which is the energy due to motion of a body, can be calculated by using the formula;
K.E = 1/2 × m × v²
Where;
K.E = kinetic energy (joules)
m = mass of body (kg)
v = speed or velocity (m/s)
According to this question, the mass of the roller coaster is 833.0 kg while its velocity/speed is 20.0m/s.
K.E = 1/2 × 833 × 20²
K.E = 1/2 × 833 × 400
K.E = 1/2 × 333200
K.E = 166,600
Therefore, the kinetic energy of the roller coaster car is 166,600J.
Think about and describe how the organism might move around and how it might eat.Required to answer.
Answer:
Organisms move and eat through their habitats. They adapt to the environment and can survive in the environment with their own behavior.
Explanation:
Organisms are of many types. Some lives on land, some lives in water while others are hybrid organisms which can survive in water as well as on land. The organisms body movement is dependent on its cell functioning. Every organism has different cell structures which help them to survive on the earth.
When a gas is heated, the gas particles have more kinetic energy. Complete the following sentence: This means they move about more and have more ______ with the sides of the container. This increases the pressure.
Answer:
Contact
Explanation:
As the speed of the particles increases, they move around more, which means they hit the sides of the container more.
when HCl react with finely powdered iron it form ferrous chloride and not ferric chloride. why?
Answer:
When iron is allowed to react with HCl,
It produces hydrogen and the release of hydrogen gas prevents the formation of ferric chloride.
Hope it helps
Thank you
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Compound X has a molar mass of 104.01·gmol−1 and the following composition: element mass % nitrogen 26.93% fluorine 73.07% Write the molecular formula of X .
Answer: N2F4
Explanation:(NF2)x2 = N2F2
The compound X has a molar mass of 104.01·gmol−1 and the following composition: element mass % nitrogen 26.93% fluorine 73.07%, then the molecular formula of X is N2F4.
What is molecular formula?Molecular formula is defined as a chemical formula that give the total number of atoms of each elements in each molecule of a substance.
It can also be defined as a phrase that specifies the number of atoms of each element in a complex molecule.
It represents the actual number of each atom in a molecules.
It tells us which atoms and how many of each types of atoms are present in a molecule.
NF2 x 2 = N2F4
Thus, the compound X has a molar mass of 104.01·gmol−1 and the following composition: element mass % nitrogen 26.93% fluorine 73.07%, then the molecular formula of X is N2F4.
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9 Answer
Based on Table S, an atom of which element has the strongest attraction for electrons in a chemical bond
What is the answer?
1 aluminum
2 chlorine
3 magnesium
4 sulfur
Answer:
Chlorine
Explanation:
The tendency of an atom to attract electron is referred to as electronegativty. In the periodic table, electronegativity increases across the period from left to right and decreases down the group.
Following that trend, the element with the greatest electronegativty is;
Chlorine
The atom that has the strongest attraction for electrons in a chemical bond in the options is Chlorine.
The tendency of an atom to attract electrons to itself is know as electronegativity.
The most electronegative element is fluorine.
Electronegativity increases across the period in the periodic table.
Electronegativity decreases down the group in the periodic table.
Examples of electronegative elements are mostly non metals like oxygen, fluorine, chlorine, etc.
Therefore, the atom that has the strongest attraction for electrons in a chemical bond is Chlorine.
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What’s the answer for this question
Answer:
i think it's B
Explanation:
