Answer:
n = 11.45 mol
Explanation:
Given data:
Number of moles = ?
Volume of gas = 98 L
Pressure = 2.8 atm
temperature = 292 K
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
2.8 atm × 98 L = n × 0.0821 atm.L/ mol.K × 292 K
274.4 atm.L = n × 23.97atm.L/ mol
n = 274.4 atm.L /23.97atm.L/ mol
n = 11.45 mol
Which is most likely the result of millions of metal atoms crowding together so that molecular orbitals become combined?
The formation of bands in a crystal
Explanation:
- hope that helped :)
The specific heat of a certain type of metal is 0.128 J/(g⋅∘C). What was the intial temperature if 0.305 kJ of heat is added to 94.8 g of metal to reach a temperature of 85.0 ∘C?
The intial temperature : 59.865 °C
Further explanationHeat added :
Q = m . c . ΔT
Q = heat, J
m = mass, g
c = specific heat, joules / g ° C
∆T = temperature difference, ° C / K
[tex]\tt 305=94.8\times 0.128\times (85-t_1)\\\\85-t_1=25.135\\\\t_1=59.865^oC[/tex]
what are the locations & charges of the 3 subatomic particles?
Answer:
protons, neutrons, electrons
Explanation:
the three main subatomic particles that form an atom protons,neutrons and electrons. the center of the atom is called the nucleus.
Answer:
[tex]{\boxed {\sf Protons: +1, Nucleus}}[/tex]
[tex]\boxed {\sf Neutrons: 0, Nucleus}}[/tex]
[tex]\boxed {\sf Electrons: -1, Surrounding \ the \ Nucleus}}[/tex]
Explanation:
There are 3 subatomic particles: protons, neutrons, and electrons.
Protons
Charge
Positive +1Location
In the nucleus (dense center of the atom)Neutrons
Charge
No charge 0Location
In the nucleusElectrons
Charge
Negative -1Location
Surrounding the nucleus4. Which of the following ideas is NOT true? *
A. Atoms of the same element have a constant number of neutrons.
B. Atoms have a central, positively charged nucleus.
C. Atoms may gain or lose electrons to become ions.
D. Atoms of the same element have a constant number of protons.
Answer:
c
Explanation:
Answer:
the answer of the question is C
can someone help me please i’ll give brainly
[tex]\huge\boxed{Option A}[/tex]
_____________________________________As the option says, the kinetic energy will decrease. the volume decreases because the molecules are slower and collide less. Less molecules make the effective collisions due to which the kinetic energy of molecules is less, so less kinetic energy results in the shrinkage. So decrease in temperature lowers the rate of the reaction and in the volume.
_____________________________________Best Regards,'Borz'The table above summarizes data given to a student to evaluate the type of change that took place when substance X was mixed with water. The student claimed that the data did not provide enough evidence
to determine whether a chemical or physical change took place and that additional tests were needed. Which of the following identifies the best way to gather evidence to support the type of change that
occurred when water and X were mixed?
The question is incomplete, the complete question is;
The table above summarizes data given to a student to evaluate the type of change that took place when substance X was mixed with water. The student claimed that the data did not provide enough evidence to determine whether a chemical or physical change took place and that additional tests were needed. Which of the following identifies the best way to gather evidence to support the type of change that occurred when water and Xwere mixed?
A. Measuring the melting point of the mixture of water and X
B. Adding another substance to the mixture of water and X to see whether a solid forms
C Measuring and comparing the masses of the water, X, and the mixture of water and X
D Measuring the electrical conductivities of X and the mixture of water and X
Answer:
D Measuring the electrical conductivities of X and the mixture of water and X
Explanation:
Unfortunately, I am unable to reproduce the table here. However, from the table, the temperature of the of the mixture of the solid X and water was 101.6°C. This is above the boiling point of water and way below the temperature of the solid X.
This goes a long way to suggest that there was some kind of interaction between the water and X which accounted for the observed temperature of the system of X in water.
The only way we can be able to confirm if X actually dissolved in water is to measure the conductivity of the water. dissolved solids increase the conductivity of water.
The statement which identifies the best way to gather evidence to support the type of change that occurred when water and X were mixed is:
D Measuring the electrical conductivities of X and the mixture of water and XAccording to the given question, we are asked to show the statement which identifies the best way to gather evidence to support the type of change that occurred when water and X were mixed. \
As a result of this, we can see that from the complete question, there is a need to note the temperature of the solution which is 101.6°C and then to measure the conductivity of the water to know for sure the type of change that occured.
Therefore, the correct answer is option D
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what does the atomic mass number of each atom represent.
The atomic mass number tells us the number of neutrons and protons in the nucleus of an atom.
can you guys help me
Answer:
B) 6 Newtons
Explanation:
Applied Force = 10 N
Resistive Frictional Force = 4 N
As we know that frictional forces always act in the opposite of the relative motion [force], and that opposite forces always subtract.
Hence,
The Net Force acting on the block = 10 N -4 N = 6 Newtons
Answer: The Answer is B
How do electrons differ from both protons and neutrons?
Answer:
Electrons occupy the regions around the nucleus(energy levels) while protons and neutrons are found in the nucleus
Chemistry
How do I do these ?
Answer: chill google dat junk sis lol but i thought i could help i just dont wanna get u da wrong answer su
Explanation:
Describe what happens to particles of matter as you cool the matter to absolute zero (0K). In your description, be sure to explain the changes in kinetic energy and particles motion.
Explanation:
As you cool a matter to absolute zero, their kinetic energy reduces significantly and the molecules slows down and begins to aggregate together.
Cooling involves the removal of heat energy from a body. Heat increases the thermal energy of system. As heat is added, the molecules gain more kinetic energy. This shown in their increase motion. When heat is withdrawn, the particles slows down.What is the force needed to cause a 80kg object to accelerate at 1.6m/s??
Answer:
The answer is 128 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × acceleration
From the question we have
force = 80 × 1.6
We have the final answer as
128 NHope this helps you
What is the single distinctive property of metals
Answer:
All metals have a shiny appearance (at least when freshly polished); are good conductors of heat and electricity; form alloys with other metals; and have at least one basic oxide.
Explanation:
Answer:
All metals have a shiny appearance (at least when freshly polished); are good conductors of heat and electricity; form alloys with other metals; and have at least one basic oxide.
Explanation:
Which state of matter do mercury, orange juice and lava represent?
Answer:
they represent liquid state of matter.
Answer:
they state liquid state of matter .
hope it is helpful to you
explain how you would obtain pure water from tap water.Your answer must include reference to the principles involved under the topic separating mixture
Answer:
Simple distillation
2. Al(OH),(s) + 3 HCl(aq) à 3 H2O(l) + AlCl3(aq). This reaction shows how aluminum hydroxide
in antacid tablets neutralizes hydrochloric acid in the stomach. A tablet containing 0.25 g of
aluminum hydroxide is ingested by a patient with 0.88 g of hydrochloric acid in their stomach. Is
this tablet sufficient to neutralize the acid in the patient's stomach? Explain using stoichiometric
calculations. [4 marks]
I
This tablet insufficient to neutralize the acid in the patient's stomach
Further explanationReaction
Al(OH)₃(s) + 3HCl(aq) ⇒ 3 H₂O(l) + AlCl₃(aq)
0.25 g of Aluminum hydroxide-Al(OH)₃ , mol (MW=78 g/mol) :
[tex]\tt \dfrac{0.25}{78}=0.00321[/tex]
mol HCl : mol Al(OH)₃ = 3 : 1
[tex]\tt mol~HCl=3\times 0.00321=0.00963[/tex]
mass HCl (MW=36,46 g/mol) :
[tex]\tt 0.00963\times 36.46=0.351[/tex]
0.351 < 0.88⇒this tablet insufficient to neutralize the acid
P3- is a(n) ______________________, so it ________________ valence electrons. Group of answ er choices anion, gained cation, gained cation, lost anion, lost
Answer: anion , gained
Explanation:
When an atom accepts an electron negative charge is created on atom and is called as anion.
When atom loses an electron positive charge is created on atom and is called as cation.
Phosphorous (P) has an atomic number of 15 which means it contains 15 electrons and there are 5 valence electrons.
For formation of , the atom of phosphorous (P) must gain three electrons in its valence shell 3p so as to complete its octet
[tex]P:15:1s^22s^22p^63s^23p^3[/tex]
[tex]P^{3-}:18:1s^22s^22p^63s^23p^6[/tex]
A balloon filled with helium occupies 21.0ft³ at 55.0°F. Find the temperature of the helium if the volume of the balloon decreases to 11.0ft³. (Assume that the pressure is held constant.)
Answer:
Assuming pressure is held constant,the question reduces to a ratio and proportion type of question where;
At constant pressure,
21.0ft³-55.0°F
11.0fy³=11.0ft³/21.0ft³×55°F
The temperature is 28.809°F≈29°F
29°F is the temperature of the helium if the volume of the balloon decreases to 11.0ft³.
What is temperature?Temperature expresses hotness and coldness or a measure of the average kinetic energy of the atoms or molecules in the system.
Assuming pressure is held constant, the question reduces to a ratio and proportion type of question where;
At constant pressure,
21.0ft³- 55.0°F
11.0fy³ = 11.0ft³ ÷ 21.0ft³ × 55°F
The temperature is 28.809°F ≈ 29°F
Hence, 29°F is the temperature of the helium if the volume of the balloon decreases to 11.0ft³.
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What are the rules for naming ionic bonds?
Answer:
An ionic compound is named first by its cation and then by its anion. The cation has the same name as its element. For example, K+1 is called the potassium ion, just as K is called the potassium atom.
Which atmospheric layer is closest to Earth's surface?
A exosphere
B. mesosphere
c. stratosphere
D. troposphere
Answer:
The answer is the troposphere
Explanation:
It is the closest to earth
below shows Eddie fishing.
Using the picture, which of the following is the best example of mechanical energy?
Group of answer choices
the pole, line, and hook used for fishing
Eddie reeling in a fish that he has caught
Eddie standing on the side of the river
the Sun shining and warming the water
Answer:
B is correct
Explanation:
pls Brainliest
Answer:
Eddie reeling in a fish that he has caught
Explanation:
You can choose from four different materials to make the handrails that run up the stairs and around the playhouse: steel, aluminum, solid plastic, or pine wood.
2. Would you want to minimize or maximize the heat transfer to and from the handrails? Explain your reasoning.
Answer: The best material to make the handrails of the playhouse is Aluminum. This is because aluminum is an extremely versatile metal with a number of advantages, it is recognized for being both lightweight and flexible.
Explanation:
HOPE THIS HELPS!
ALSO THE OTHER ANSWER IS WRONG.
JUST SAYING >33
how does the VSPER theory explain molecular shape
A. Electron pair attractions pull atoms together
B. Electron pairs repelling each other push atoms apart
C. Valence electrons modify core electron orbitals
D. Intermolecular forces distort electron bonds
Answer:
B. Electron pairs repelling each other push atoms apart
Explanation:
The VESPR theory explains molecular shape by suggesting that electron pairs repelling each other push atoms apart.
If an atom is bonded to two or more other kinds of atoms as in many covalent molecules and ions, the shape of the system is determined by the geometry of the bonds around the central atom.
The variations in the bond angles of such molecules is explained by the valence shell electron pair repulsion theory. All the electrons will orient themselves in such a way to minimize the electrostatic repulsion between them. The repulsions determines the geometry of the covalent bonds around the central atom.calculate the ph of a solution whose(oh^-) is 4.583*10^-5 mole dm cube (pkw=14)
pH of solution = 9.661
Further explanationpH is the degree of acidity of a solution that depends on the concentration of H⁺ ions. The greater the value the more acidic the solution and the smaller the pH.
pH = - log [H⁺]
So that the two quantities between pH and [H⁺] are inversely proportional because they are associated with negative values.
pOH=-log[OH⁻]
[tex]\tt pOH=-log[4.583\times 10^{-5}]\\\\pOH=5-log~4.583=4.339[/tex]
pH+pOH=pKw
[tex]\tt pH=14-4.339\\\\pH=9.661[/tex]
What element has 4 energy levels and 8 valence electrons?
The element having 8 valence electrons and 4 energy levels is krypton, (Kr) it is a noble gas included in 18th group.
What is krypton?Krypton is 36th element in periodic table with main shell electronic configuration, K= 2, L= 8, M= 18 and N= 8 where, K, L, M and N are energy levels.
Krypton is in the group noble gases also called inert gases. The group members of Kr are, Helium, argon and xenon. Thus krypton is the element with 4 energy levels and 8 valence electrons.
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How many moles are there in a 122 gram sample of nickel (Ni)?
7.16 x 103 moles
6.22 mol
2.08 mol
0.481 mol
The atomic mass of nickel is 58.71 gm and the given mass of nickel is 122 gm. Therefore, 2.08 moles are present in a 122-gram sample of nickel.
Nickel:
The atomic number of nickel is 28.The symbol of nickel is Ni.Density of a nickel 8.908 g/cm3.It is a d block element.It belongs to group 10 and period 4.It is also called transition metal.It is a metal and is located between groups 2 and 3.Mass of nickel given: 122 grams.
Atomic mass of nickel: 58.71 g mol
Number of moles = Mass / molar mass
= 122/ 58.71
= 2.078
= 2.08 moles.
The atomic mass of nickel is 58.71 gm and the given mass of nickel is 122 gm. Therefore, 2.08 moles are present in a 122-gram sample of nickel.
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Which of the following choices contains the most thermal energy? a penny that is 20 degrees Celsius ( oC) an atom of aluminum that is 20 degrees Celsius ( oC) a 50 milliliter (ml) glass of water at 20 degrees Celsius ( oC) a 900 milliliter (ml) pitcher of orange juice at 20 degrees Celsius ( oC)
Answer: a 900 milliliter (ml) pitcher of orange juice at 20 degrees Celsius ( oC)
Explanation:
Thermal energy is the energy possessed by an object by virtue of its temperature. The hotter the substance, the more its molecules vibrate, and therefore the higher its thermal energy.
Thermal energy refers to the sum of kinetic, potential, vibrational ,electronic and rotational energies of the object.
For bodies at same temperature, the body with more molecules will have more thermal energy due to more collisions.
Is lysomes a plant or animals cell
Answer:
Animal
Explanation:
how do i write a c-e-r for this
Heating/Cooling curves can reveal information about the changes in kinetic and potential energy as
heat energy is added or removed. Kinetic energy is energy of motion that increases when heat is
increased. Kinetic energy changes when temperature changes (slopes). Potential energy is the
energy of position. Potential energy changes when temperature is constant (plateaus). Heat energy
added can either be used to change the speed of particles or the spacing of particles. Identify the
points on the heating curve where kinetic energy changes and where potential energy changes. Use
evidence from the simulation to support your claims about how energy is used at slopes and
plateaus.
Answer: it’s B for edge !
Explanation: took the test
While you were "sweating" your chemistry test, water vapor evaporates from your body, absorbing 50,000 J of energy. (assume no
temperature change). What mass of water evaporates?
A:O 150 g
B:O 22 g
C:11,962 g
D:O 105,000 g
Answer:
[tex]\boxed {\boxed {\sf B. \ 22 \ grams}}[/tex]
Explanation:
We need to use the formula for heat of vaporization.
[tex]Q=H_{vap}*m[/tex]
Identify the variables.
The heat absorbed by the evaporating water is the latent heat of vaporization. For water, that is 2260 Joules per gram. Q is the energy, in this problem, 50,000 Joules. m is the mass, which is unknown.[tex]H_{vap}=2260 \ J/g\\Q=50,000 \ J \\[/tex]
Substitute the values into the formula.
[tex]50,000 \ J=2260 \ J/g*m[/tex]
We want to find the mass. We must isolate the variable, m.
m is being multiplied by 2260 J/g. The inverse operation of multiplication is division. Divide both sides by 2260 J/g.
[tex]\frac{50,000 \ J}{2260 \ J/g} =\frac{2260 \ J/g*m}{2260 \ J/g}[/tex]
[tex]\frac{50,000 \ J}{2260 \ J/g} =m[/tex]
Divide. Note that the Joules (J) will cancel each other out.
[tex]\frac{50,000 \ }{2260 \ g} =m[/tex]
[tex]22.1238938 \ g =m[/tex]
Round to the nearest whole number. The 1 in the tenth place tells us to leave the number as is.
[tex]22 \ g \approx m[/tex]
The mass is about 22 grams, so choice B is correct.