The radius in picometers of a Pt atom = 1.4 x 10⁻⁸ cm.
Given:
Length of edge = 1.0 cm
Density of platinum = 21.45 g/cm³
Mass of platinum = 3.240 x 10⁻²²g
Here, we must determine how many platinum atoms are contained within a cube.
We must first determine the quantity of platinum present in one gram in order to compute the number of platinum atoms.
= 1.0 cm³ x 21.45 g/cm³
= 21.45 g
Then the number of atom present is,
= 21.45 g/ (3.240 x 10⁻²²g Pt)
= 6.6 x 10²² Pt atoms.
Hence the number of atoms present in platinum is 6.6 x 10²² Pt atoms.
Begin with the single platinum atom and use the number of platinum atoms per 1.0 cm³ (the result from Part A) as a conversion factor to convert the number of platinum atoms into cubic centimeters of space.
In order to convert cubic centimeters of space into cubic centimeters of platinum atoms, multiply the percent of space occupied by a platinum atom by the original measurement.
[tex]v_{atom} = \frac{4}{3} \pi r^{3} _{atom}[/tex]
[tex]\frac{3V_{atom} }{4\pi } =r_{3} ^{atom}[/tex]
[tex]r_{atom} =\sqrt[3]{\frac{3V_{atom} }{4\pi} }[/tex]
[tex]=\sqrt[3]{\frac{3(1.12X10^{23} cm^{3} }{4\pi } }[/tex]
= 1.4 x 10⁻⁸ cm
So, The radius in picometers of a Pt atom = 1.4 x 10⁻⁸ cm.
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How many moles of NaOH would there be in 76 mL of 1.57 M aqueous KOH solution (0.3 M)
Answer:
Explanation:
1M
Direction: Read the sample scientific method problem below and answer the following questions.
You and your friend are walking along a beach in Maine on January 15, at 8:00 am. You notice a thermometer on a nearby building that reads -1°C. You also notice that there is snow on the roof of the building and icicles hanging from the roof. You further notice a pool of sea water in the sand near the ocean. Your friend looks at the icicles and the pool and says, "How come the water on the roof is frozen and the sea water is not?" You answer, "1 think that the salt in the sea water keeps it from freezing at -1°C." You go on to say, "And I think under the same conditions, the same thing will happen tomorrow." Your friend asks, "How can, you be sure?" You answer, "I'm going to get some fresh water and some salt water and expose them to a temperature of-1°C and see what happens."
Pakilagay nden ng scientific method.
While sea water does not freeze at -1°C, fresh water does.
The prediction will be "I think that the salt in the seawater keeps it from freezing at -1 Celcius."
The problem statement is "How come the water on the roof is frozen and the sea water is not?"
The statement that contains data is "I'm going to get some fresh water and some salt water and expose them to a temperature of-1°C and see what happens."
In a temperature of -1°C, fresh water is frozen while sea water is not.
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23. Write a balanced net ionic equation for each of the fol- lowing acid-base reactions in water. 21 (a) nitrous acid and barium hydroxide (b) potassium hydroxide and hydrofluoric acid (c) aniline (C6H5NH₂) and perchloric acid Waite
The balanced net iconic equation :
(a) 2HNO3 (aq) Ba(OH)2 (aq) Ba(NO3) (aq) + 2H20(b) HF(aq) + K+(aq) + OH-(aq) → K+(aq) + F-(aq) + H2O(l) Net: HF(aq) + OH-(aq) → H2O(l) + F-(aq)(c) C6H5NH2 + HClO4 → ClC6N + 4H2OBriefing :Salt and water are created when an acid and a base interact then Acid-based reaction happens. Because both water and salt are neutral, if an acid and a base react together, they cancel out each other's effects. It is referred to as a neutralization reaction as a result.
What is acid-base reaction?An acid-base reaction is a chemical reaction involving an acid and a base.
H+ and OH- ions are produced by bases and acids, respectively, and these ions combine to make water. There are a number of drawbacks to the Arrhenius theory. Because it defines acids and bases in terms of what occurs when compounds dissolve in water, it can only be applied to reactions that take place there.
One or more hydrogen ions, H+, are exchanged between entities that may be neutral (such as H2O) or electrically charged (ions-ammonium, NH4+; hydroxide, OH; or carbonate, CO32); in an acid-base process.
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Does a reaction occur when aqueous solutions of lead(II) nitrate and nickel(II) chloride are combined?
If a reaction does occur, write the net ionic equation.
A chemical reaction does occur when an aqueous solutions of lead(II) nitrate and nickel(II) chloride are combined.
The correct answer choice to the above is option a.
This means that when an aqueous solutions of lead(II) nitrate and nickel(II) chloride are combined, it gives lead II chloride and nickel trixonitrate IV
The net ionic equation is given below:
Pb(NO3)2 + NiCl2 ----- PbCl2 + Ni(NO3)2
Pb2+ NO3- + Ni2+Cl- ----- Pb2+ Cl- + Ni2+ NO3-
What are chemical reactions?Chemical reactions are those reactions whereby substances combine together to form other substances. The substances which combine together are called the reactants while the new substance formed is known as product.
So therefore, a chemical reaction does occur when an aqueous solutions of lead(II) nitrate and nickel(II) chloride are combined.
Complete question:
Does a reaction occur when aqueous solutions of lead(II) nitrate and nickel(II) chloride are combined?
a. yes
b. no
If a reaction does occur, write the net ionic equation.
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How many electrons are in each energy level of the following element?
Ca (calcium)
N1,N2,N3,N4 = ____
Answer:
each level of calcium holds 8 electrons
The periodic table is arranged by various patterns is there a pattern with regard to ionic charge? In 3 to 5 sentences explain your reasoning and provides specific examples
In the periodic table, positive ions grow in magnitude from left to right, whereas negative ions grow in magnitude from right to left.
The periodic table shows that there are more valence electrons on the right than the left. The maximum amount of ionic charge that an element can hold fluctuates as the quantity of valence electrons rises.
Metals on the periodic table's left side mostly produce positively charged ions. These ions get stronger with time, increasing in size.
The negative charges on the ions that nonmetals on the right side of the periodic table produce, have a diminishing magnitude with time.
For example, when we move from atomic number10 to 11, because we are changing from a noble gas to a very reactive alkali metal, moving from such an element with a full octet to one with just the outermost electron, which readily relinquishes it in order to follow the octet rule, there is a very significant degree of change in reactivity.
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68.0 g H₂CC1₂. how many moles
Answer:
0.801 moles H₂CCl₂
Explanation:
To find the amount of moles, you need to multiply the given mass by the molar mass. The molar mass is a ratio describing the mass (g) per every 1 mole. The molar mass of H₂CCl₂ can be calculated by adding the atomic masses of each atom within the molecule.
When multiplying a number by the molar mass, it is important to arrange the ratio in a way that allows for the cancellation of units (moles should be in the numerator). The final answer should have 3 sig figs like the given value (68.0 g = 3 sig figs).
Atomic Mass (H): 1.008 g/mol
Atomic Mass (C): 12.011 g/mol
Atomic Mass (Cl): 35.453 g/mol
Molar Mass (H₂CCl₄): 2(1.008 g/mol) + 12.011 g/mol + 2(35.453 g/mol)
Molar Mass (H₂CCl₂): 84.933 g/mol
68.0 g H₂CCl₂ 1 mole
------------------------- x ------------------ = 0.801 moles H₂CCl₂
84.933 g
1429000 in scientific notation
What reagents are required to synthesize alcohols?
Answer:
Top = H₂SO₄, H₂O or H₃O⁺
Middle = 1.) Hg(OAc)₂, H₂O
2.) NaBH₄
Bottom = 1.) BH₃ · THF
2.) H₂O₂, NaOH
Explanation:
In the top reaction, the alcohol is being added to the most substituted carbon in the entire molecule. The top reaction could use H₂SO₄, H₂O as the reagents or H₃O⁺ as the reagent.
In the middle reaction, the alcohol is being added to the most substituted carbon included in the double bond. Hg(OAc)₂ is the shorthand way of representing mercury (II) acetate.
In the the bottom reaction, the alcohol is being added to the least substituted carbon included in the double bond.
Which of the following reactions will proceed to the right?
•Ag(s) + Ni2+ (aq) →
•Ni(s) + Mg2+ (aq) →
•Pb(s) + Na+(aq) →
•Cu(s) + H+(aq) →
•Zn(s) + Ag+(aq) →
Answer:
First reaction which is the silver + nickel 2 molecules is right answer of the question
4. Write the configuration for the electron:
a) 4, 2, -1, +1/2
Electron configuration can be defined as the specific arrangement of negatively charged electrons in different energy levels around atomic nuclei.
How to write electronic configuration ?Electronic configuration of 4 = [He]2s2
Electronic configuration of 2= 1s2
Electronic configuration of -1= No configuration
Electronic configuration of 1/2= No configuration
Hence electronic configuration finds this above way.
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This political cartoon drawn by John Donaghy appeared in The Daily Graphic on September 16, 1873. The message of this cartoon is reflective of what situation in the late 1800s?
Explain how the individual parts shown in the model come together to form a cycle.
Answer: The four main components of the earth system may be described briefly in the ... as energy is transformed from one form to another in performing work, heat is ... of solar radiation received (and re-emitted) at different points on the earth's surface. ... In general, cycles occur in closed systems; at the global scale, many systems
Explanation:
Earth's outer core is
moved by plate tectonics.
Above the crust and mantle
below the crust and mantle.
made of solid iron.
Answer: A
Explanation: the iron is liquid (so not D), it’s below the mantle but not above the crust (so not B &C)
Which statement is true about stable isotopes
Stable isotopes are non-radioactive form of atoms.
properties of stable isotopes are :-
They have a stable nucleus that does not decay, so they are stable. Most of the isotopes become stable by emitting alpha particles, beta particles, positrons, or gamma rays. A few of them become stabilize themselves by electron capture or by spontaneous fission. there are 256 known stable isotopes of the 80 elements which have one or more stable isotopes.Atoms found in nature are either stable or unstable. An atom is stable if the forces among the particles that makeup the nucleus are balanced. An atom is unstable (radioactive) if these forces are unbalanced; if the nucleus has an excess of internal energy.
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this question is incomplete, above content might be helpful
Question 1.4) Two bottles of the same gas are connected. One bottle has 15 particles at first and one has 2 particles. What will happen over time? Why?
We know that in gas the particles are loosely packed, that is it can move freely compared to solid and liquid. Two bottles of the same gas are connected. One bottle has 15 particles at first and one has 2 particles. Diffusion will occur. The particles will move until the volume in both the bottles will be equalized.
For gas there are three laws which are applied. Boyles law, Charles law and Avogadro's law.
Boyles law here it is the relationship between the pressure and the volume. when the volume of the gas at constant temperature varies with pressure applied on it inversely. Formula
P₁V₁=P₂V₂
Charles law is explained in the terms of temperature and volume. it states that the volume of the gas in a fixed amount is directly proportional to its temperature if and only the pressure remains constant. formula
V₁/T₁=V₂/T₂
Avogadro's law is related with the amount and the volume. it says that under the same condition the pressure and the temperature, the equal volume of different gases contains equal number of molecules.
V₁/n₁=V₂/n₂
Diffusion will occur and the particles will be same in both.
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Which statement best describes force?
1.Force is a scalar quantity that measures both direction and magnitude of a push or pull on an object.
2.Force is a vector quantity that measures both momentum and magnitude of a push or pull on an object.
3.Force is a vector quantity that measures both direction and magnitude of a push or pull on an object.
4.Force is a vector quality that measures both direction and magnitude of a push or pull on an object.
Force is a vector quality that measures both direction and magnitude of a push or pull on an object.
Force is an influence or impact that can change the position or the motion of an object. it can cause an object with mass to change its velocity that is to accelerate or decelerate. It can be also stated as push or pull on an object. it obey vector law of addition that is it has both magnitude and direction.
Its formula is mass multiplied by acceleration that is F=m.a
its unit is N (Newton).
there are different types of forces frictional, constant, tension etc.
Force is a vector quantity that measures both direction and magnitude of a push or pull on an object this is the correct sentence.
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Answer:
(Question 1) Which statement best describes force?
(Answer) Force is a vector quantity that measures both direction and magnitude of a push or pull on an object.
(Question 2) A soccer ball is traveling downfield with a force of 1.2 kN and strikes another soccer ball that is stationary. Which of the following describes the result of the collision?
(Answer) The stationary soccer ball will begin moving downfield and the ball that struck it will slow down.
(Question 3) Which of the following scenarios accurately describes magnitude and direction?
(Answer) A car traveling northward with 5 kN of force could be brought to a stop by a southward force of 5 kN.
(Question 4) What is force directly proportional to?
(Answer) the acceleration and mass of an object
(Question 5) Two ropes are being used to suspend a box. Each rope is exerting 5 N of upward force. If the forces are balanced and the box is stationary, how much force is being exerted by the box itself and in which direction?
(Answer) The box exerts 10 N of force downward.
Explanation:
just did the Quick Check, Enjoy UwU
how do you separate water and oil
Answer:
below
Explanation:
Oil and water don't mix because they are insoluble (do not mix) to each other. The only way to separate water and oil would be to use a separating funnel. A separating funnel is a funnel that has the ability to separate two liquids.
Best of Luck!
Pieces of potassium (3.68 x 10-19 J) and sodium (4.41 x 10-19 J) metal are exposed to radiation of wavelength 270.0 nm.
Which metal emits electrons with the greater velocity?
What is the velocity of the electrons from potassium?
559
m/s
What is the velocity of the electrons from sodium?
Potassium emits more electrons with the greater velocity.
What are electrons?The electric charge of the electron, a subatomic particle, is a negative one elementary charge. Because they are assumed to be elementary particles and do not have any known components or substructure, electrons are part of the first generation of the lepton particle family.
The velocity of the electrons from potassium is 8.055 x 105 m/s
The velocity of the electrons from sodium 2/5 V
According to Bohr's model the velocity of an electron is-
[tex]V_{N}[/tex] = [tex]Ze^{2}[/tex] /2nh
[tex]V_{n}[/tex] ∝ 1/5
[tex]V_{5}/V_{2}[/tex]
= 2/5
Given that:- [tex]V_{2}[/tex] =v
[tex]V_{5}[/tex]
= 2/5 v
Hence the velocity of an electron will be
2/5v.
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The pace at which an object's position changes in relation to a frame of reference is known as its velocity, and it depends on time.
What is Velocity?The primary indicator of an object's position and speed is its velocity. It is the distance that an object travels in one unit of time.
The displacement of the item in one unit of time is the definition of velocity. You are aware that a big displacement over a short period of time corresponds to a large velocity, and that velocity is measured in terms of the speed of objects in terms of miles per hour or kilometers per hour. Potassium is an element with the symbol K.To learn more about Velocity refer to:
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What group of elements tend to lose electrons?
Answer:
metals tend to lose electrons
Use the diagram to answer the question
Based on the diagram, which statements about stellar evolution are true? Select the two correct answers.
Massive stars evolve more slowly than average stars.
Massive stars evolve more quickly than average stars.
Average stars evolve more slowly than massive stars.
Massive and average stars evolve at about the same speed.
Average stars evolve more quickly than massive stars.
SOME ONE PLEASE HELP!! Earth Science
We can see from the timescales in the question that; average stars evolve more slowly than massive stars.
What are stars?Stars are massive structures which produce heat and light by nuclear fusion. The term fusion has to do with the combination of one or more nuclei to form a larger nucleus. Heat and light are evolved in the process. The temperature at which this fusion occurs is so great that it is not possible to achieve the fusion reaction here on earth as the outrageously high temperatures required to do so is almost impracticable.
Stars are able to change from one form to another by the process of stellar evolution. This process could give rise to both the massive stars as well as the smaller size average stars as we have them in the outer space and visible to the astronomers by the use of telescopes.
Thus, we can then conclude from what is shown in the image that; average stars evolve more slowly than massive stars.
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What does a physicist study
A. The flow of electricity through water
B. The movement of matter
C. Rocks and minerals
D. The interaction of elements
Answer:
i believe it is " D, the interaction of elements "
A mixture of CaBr2 and inert material is analyzed to determine the Ca content. First the mixture is dissolved in water. Then all of the bromide ion is precipitated as AgBr by the addition of an excess of silver nitrate.
CaBr2(aq) + 2AgNO3(aq) 2AgBr(s) + Ca(NO3)2(aq)
In one experiment, a 0.8206 g sample of the mixture resulted in 1.1196 g of AgBr. Determine the percent (by mass) of Ca in the mixture.
The mass percent of calcium is 14.5%.
What is the mass percent of calcium?We know that a reaction is said to occur when there is an interaction between two reactants that leads to the formation of a product. In this case, the equation of the reaction is shown in the question above.
Number of moles of silver bromide produced = 1.1196 g/188 g/mol = 0.00595 moles
If 1 mole of calcium bromide produces 2 moles of silver bromide
x produces 0.00595 moles of silver bromide
x = 0.00595 moles * 1 mole/2 moles
= 0.00298 moles
Number of moles calcium ions in sample = 0.00298 moles
Mass of calcium in sample = 0.00298 moles * 40 g/mol = 0.1192 g
Mass percent of calcium = 0.1192 g/ 0.8206 g * 100/1
= 14.5%
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How much Tween 20 is needed to prepare 350 mL of a 10% Tween 20 (v/v) solution?
a. 35 ml
b. 350 ml
c. 3.5 ml
d. 0.350ml
35ml of tween 20 needed to prepare 350 mL of a 10% Tween 20 (v/v) solution
according to the question to prepare 10% of tween 20 (v/v) solution so, 350(0.1)= 35ml.
Since liquids are frequently measured in volume, volume percent, abbreviated as v/v%, is frequently used to describe the concentration of binary mixtures of liquids. When you purchase isopropanol (rubbing alcohol) at the shop, for instance, you'll see that it says 70% (vv), which denotes by volume. So its one of the convenient way of calculating volume of solutions.
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The correct answer is 35ml of tween solution.
Tween 20 is a non-ionic detergent that is utilized in numerous biological processes, such as western blotting and immunochemistry. A liquid with a high viscosity is tween 20.To prepare, 35ml of tween 20 are required. 350 mL of a 10% (vol/vol) Tween 20 solutionPrepare 10% of the tween 20 (v/v) solution per the question; hence, 350(0.1) = 35ml.Volume percent, abbreviated as v/v%, is widely used to express the concentration of binary mixes of liquids because liquids are frequently measured in volume. For instance, you'll observe that the label on isopropanol (rubbing alcohol) at the store states 70% (vv), which stands for by volume.This makes it one of the practical methods for determining the volume of solutions.
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Describe how scientific theories and scientific laws are similar and how they are different.
Answer:
Explanation: A scientific theory is well-explained and well-tested scientific idea about the natural world. On the other hand, a scientific law is a statement that describes an observed phenomenon and its conditions.
b. A scientific theory is an explanation of an event in the natural world. However, it differs to a scientific law. Unlike a scientific theory, a scientific law does not provide an explanation but it gives us a description of an observed phenomenon.
What did the Nuremberg Laws do:
A. Kept Jews from being German citizens and marked them with a Star of David
B. Establish the policy of mass-murder against the Jews
C. Moved Jews from occupied countries to ghettos
D. Prevented Jews from being teachers or judges
Which of the following are some properties of small hydrocarbons compared with larger hydrocarbons?
A) Higher boiling point, lower volatility, lower viscosity, lower flammability
B) Lower boiling point, higher volatility, lower viscosity, higher flammability
C) Lower boiling point, lower volatility, lower viscosity, lower flammability
D) Higher boiling point, higher volatility, higher viscosity, higher flammability
A 15.9 L balloon is filled with 0.8450 mol of gas at 315.00 K. What is the pressure of the gas inside the balloon?
The pressure of a gas inside a balloon filled with 0.8450 mol of gas at 315.00K is 1.374atm.
How to calculate pressure?The pressure of a gas can be calculated by using the following formula:
PV = nRT
Where;
P = pressure of the gasV = volumeT = temperatureR = gas law constantn = number of molesAccording to this question, a 15.9L balloon is filled with 0.8450 mol of gas at 315.00 K. The pressure is calculated as follows:
P × 15.9 = 0.8450 × 0.0821 × 315
15.9P = 21.85
P = 1.374atm
Therefore, the pressure of a gas inside a balloon filled with 0.8450 mol of gas at 315.00K is 1.374atm.
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HELP ME PLEASE MY PARENTS GONNA KILL ME
Fermium has an atomic mass of 257 and an atomic number of 100. How many protons
does it have? How many neutrons?
a. protons
b. neutrons
It's of Science
A. The number of protons the Fermium atom is 100
B. The number of neutrons in the Fermium atom is 157
A. How to determine the number of protonsFermium has atomic number of 100.
Atomic number is simply defined as the number of protons in the nucleus of the atom.
Thus, the number of protons in the Fermium atom is 100
B. How to determine the number of neutronsThe number of neutrons in the Fermium atom can be obtained as follow:
Mass number = 257Proton = 100Neutron =?Mass number = Proton + Neutron
257 = 100 + Neutron
Collect like terms
Neutron = 257 – 100
Neutron = 157
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The unbalanced reaction for the combustion of pentane (C5H12) is:
C5H12 + O2
CO₂ + H₂O
If the molar mass of pentane is 72 g/mol, how many kilograms of carbon dioxide will be created
when 8.72 kilograms of pentane combust? (Give your answer to the second decimal place)
The mass (in kilograms) of carbon dioxide that will be created when 8.72 kilograms of pentane combust is 26.64 Kg
We'll beging by writing the balanced equation. This is given below:
C₅H₁₂ + 8O₂ -> 5CO₂ + 6H₂O
The following were obtained from the balanced equation:
Molar mass of C₅H₁₂ = 72 g/mol Mass of C₅H₁₂ from the balanced equation = 1 × 72 = 72 g = 72 / 1000 = 0.072 KgMolar mass of CO₂ = 44 g/mol Mass of CO₂ from the balanced equation = 5 × 44 = 220 g = 220 / 1000 = 0.22 KgFrom the balanced equation above,
0.072 Kg of C₅H₁₂ reacted to create 0.22 Kg of CO₂
How to determine the mass of CO₂ createdFrom the balanced equation above,
0.072 Kg of C₅H₁₂ reacted to create 0.22 Kg of CO₂
Therefore,
8.72 Kg of C₅H₁₂ will react to creat = (8.72 × 0.22) / 0.072 = 26.64 Kg of CO₂
Thus, 26.64 Kg of CO₂ were created from the reaction
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