The diagram shows a balloon that was rubbed with a piece of cloth what is the change
Answer: the electric charge
Explanation:
15) What is the hydronium ion concentration [H3O + ] of a 0.125 M hydrocyanic acid solution with Ka = 4.9 × 10-10? The equation for the dissociation of hydrocyanic acid is: HCN(aq) + H2O(l) ⇌ H3O+(aq) + CN- (aq)
The hydronium ion concentration [H₃O⁺]=7.826 x 10⁻⁶
Further explanationIn general, the weak acid ionization reaction
HA (aq) ---> H⁺ (aq) + A⁻ (aq)
Ka's value
[tex]\large {\boxed {\bold {Ka \: = \: \frac {[H ^ +] [A ^ -]} {[HA]}}}}[/tex]
Reaction
HCN(aq) + H₂O(l) ⇌ H₃O⁺(aq) + CN⁻ (aq)
0.125
x x x
0.125-x x x
[tex]\tt Ka=\dfrac{[H_3O^+][CN^-]}{[HCN^-]}[/tex]
[tex]\tt 4.9\times 10^{-10}=\dfrac{x^2}{0.125-x}\approx \dfrac{x^2}{0.125}\\\\x^2=6.125\times 10^{-11}\\\\x=7.826\times 10^{-6}[/tex]
How many moles of hydrogen atoms are there in 1.25 x 1025 molecules of ethane? (C2H6)
Answer:
124.56 moles of Hydrogen atoms.
Explanation:
We'll begin by calculating the number of moles of ethane that contains 1.25×10²⁵ molecules. This can be obtained as follow:
From Avogadro's hypothesis, 1 mole of any substance contains 6.02x10²³ molecules. This implies that 1 mole of ethane also contains 6.02x10²³ molecules.
Thus, 6.02x10²³ molecules are present in 1 mole of ethane.
Therefore, 1.25×10²⁵ molecules are present in = 1.25×10²⁵/6.02x10²³ = 20.76
Therefore, 20.76 moles of ethane contains 1.25×10²⁵ molecules.
Finally, we shall determine the number of mole of Hydrogen in 20.76 moles of ethane. This can be obtained as follow:
Ethane has formula as C2H6.
From the formula, 1 mole of ethane, C2H6 contains 6 moles of Hydrogen atoms.
Therefore, 20.76 moles of ethane will contain = 20.76 × 6 = 124.56 moles of Hydrogen atoms.
Therefore, 1.25×10²⁵ molecules of ethane contains 124.56 moles of Hydrogen atoms.
The volume of an ideally behaving gas is 300 L at 227°C. What volume will the gas occupy at 27°C when pressure remains constant?
Answer:
[tex]V_2=35.68\ L[/tex]
Explanation:
Initial volume, V₁ = 300 L
Temperature, T₁ = 227°C
New temperature, T₂ = 27°C
We need to find the volume of gas occupied when the temperature is 27°C.
It is based on Charle's law. A/c to Charle's law,
[tex]V\propto T[/tex] (at constant pressure)
[tex]\dfrac{V_1}{V_2}=\dfrac{T_1}{T_2}\\\\V_2=\dfrac{V_1T_2}{T_1}\\\\V_2=\dfrac{300\times 27}{227}\\\\V_2=35.68\ L[/tex]
Hence, the new volume is 35.68 L.
which factor is unable to determine the climate of an area
Answer:
The climate of any particular place is influenced by a host of interacting factors. These include latitude, elevation, nearby water, ocean currents, topography, vegetation, and prevailing winds.
Explanation:
those are what does not affect climate
after felix adds salt to the boiling water what will he have in the pot
Answer:
Salty water
Explanation:
Sorry for wasting your time.
How many gases are there that are not noble gases
Answer:
Noble gas, any of the seven chemical elements that make up Group 18 (VIIIa) of the periodic table. The elements are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson (Og).
Explanation:
I pretty much covered it in my answer!
Pls Brainliest! It would mean a lot! ;)
What two particles are found in the nucleus of an atom?
Answer: it has one proton and electron
Explanation:
Question 2
Calculate the velocity of a pickup truck with a de Broglie wavelength of 1.27 10-38 m and a
mass of 2347 kg
Explanation:
de Broglie wavelength= h/mv
v=h/m x de Broglie wavelength
v= (6.626× 10^-34)/ (2347× 1.27 × 10^-38)
v= 22.229 m/s(according to Google scientific calculator)
am sorry I don't hv a calculator at hand
SOMEONE ANSWER NOW
Which statement best explains why light can travel with or without a medium?
A medium is necessary for light waves to travel.
Light waves cannot travel in a vacuum.
Light waves are longitudinal waves that do not require a medium to travel.
Transverse waves do not require a medium to travel.
Explanation:
its light waves cannot travel through vaccum
hope it helps
Answer:
Transverse waves do not require a medium to travel.
Explanation:
Why do we assume that the color of the flame is due to the positive ion ?
Answer:
Any element placed in a flame will change its color. Atoms are made of positively charged nuclei, about which negatively charged electrons move according to the laws of quantum mechanics. Quantum mechanics constrains them to appear in various distinct patterns, called orbitals. (Orbitals are a lot like planetary orbits, but blurrier, so that you're never quite sure just where the electrons are.)
Left on their own, the electrons of an atom tend to relax into orbitals that leave the atom with the lowest possible energy--its ground state. Putting atoms into a flame, though, adds energy to the looser electrons farthest from the nucleus and pushes them into other orbitals. Eventually, these excited electrons drop back to where they ought to be, and in so doing, they release the energy they stored up as particles of light, called photons.
Explanation:
Earth is a single interconnected system. True False
Answer:
True
Explanation:
Earth is a single interconnected system but it can be subdivided into smaller systems.
A cylinder at left with balls stacked near the bottom of the cylinder has an arrow leading to a cylinder at right cylinder with balls in a layer on the bottom of the cylinder.
How is energy related to the change of state represented by the model?
Atoms gain energy as a solid changes to a liquid.
Atoms gain energy as a solid changes to a gas.
Atoms lose energy as a solid changes to a liquid.
Atoms lose energy as a solid changes to a gas.
The energy related to the change of state represented by the model is atoms gain energy as a solid changes to a liquid. Thus option A is correct.
What is energy?Energy is defined as the quantitative property that is imparted to a body or a physical system and is visible in the performance of work as well as in the form of heat and light.
It can also be defined as ability to perform work.
There are basically nine types of energy:
Thermal energyRadiant energyNuclear energyChemical energy Electrical energyMotion energySound energyElastic energyGravitational energyThere are two more forms of energy.
Potential energyKinetic energyIn terms of atomic randomness, the gas contains atoms with extremely high kinetic energies. Atoms in the solid are only vibrating where they should be. As a result, for a gas to become a solid, some energy must be lost within the atom.
Thus, the energy related to the change of state represented by the model is atoms gain energy as a solid changes to a liquid. Thus option A is correct.
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Answer: Option A
Explanation: took the test
What is the maximum kinetic energy of an ejected electron if silver metal is irradiated with 224 nm light? The
threshold wavelength for a silver metal surface is 267 nm.
Give your answer accurate to three significant figures. Use exponential notation (e.g. 1.23e-19).
Answer:The maximum kinetic energy KEe of ejected electrons (photoelectrons) is given by KEe=hf−BE KE e = h f − BE , where hf is the photon energy and BE is the binding energy (or work function) of the electron to the particular material.
Explanation:
The maximum kinetic energy of an ejected electron if silver metal is irradiated with 224 nm light is 4.66eV.
What is kinetic energy?Kinetic energy is defined as is a form of energy that an object and particle has by the reason of its movement.
It is also defined as the measure of the work that an object does by the virtue of its motion.
Kinetic energy can be expressed as
KE = 1/2 mv²
KE = hc / ∧
KE = 6.63 x 10⁻³⁴ x 3 x 10⁸ / 267
KE = 7.45 x 10⁻¹⁹ J
The charge on electrons 1.6 x 10⁻¹⁹ C
So, Maximum kinetic energy = 7.45 x 10⁻¹⁹ / 1.6 x 10⁻¹⁹
= 4.66 eV
Thus, the maximum kinetic energy of an ejected electron if silver metal is irradiated with 224 nm light is 4.66eV.
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Which of the following is an example of a reaction that you've seen in your everyday life?
Question 5 options:
Ice melting
Salt dissolving
Water freezing
Fire burning
Answer:
water freezing
Explanation:
i think so
ARE MINERALS man-made?
Answer:
no
their made from the earth
The forces that hold atoms together in an element determine its
F. conductivity
G.melting temperature only
H.hardness only
J.melting temperature and hardness
Calculate the number of grams of CuSO4 found in 3.29 mL of a 4.00 M CuSO4 solution. ______ grams CuSO4
Answer:
2.08g
Explanation:
Given parameters:
Volume of CuSO₄ = 3.29mL
Molarity = 4M
Unknown:
Mass of CuSO₄ = ?
Solution:
Let us find the number of moles from the given parameters first;
Number of moles = molarity x volume
1000mL = 1L
Express the volume of the given CuSO₄ in L = 3.29 x 10⁻³L
Number of moles = 4 x 3.29 x 10⁻³ = 0.013mol
So;
Mass of CuSO₄ = number of moles x molar mass
Molar mass of CuSO₄ = 63.6 + 32 + 4(16) = 159.6g/mol
Mass of CuSO₄ = 0.013mol x 159.6g/mol
Mass of CuSO₄ = 2.08g
PLEASE HELP!!
The scientific method is a process that scientists use to investigate something in the natural world. Which of these best describes the difference between a scientist collecting data and analyzing data?
A -When a scientist collects data the hypothesis is compared to the data. When a scientist analyzes data, data are analyzed, scientists predict future experiments.
B - When a scientist collects data, the scientist develops new ideas for experiments. When a scientist analyzes the data, he or she looks at what could be improved in the investigation.
C - When a scientist collects data, the data include the observations made during the experiment. When a scientist analyzes the data, the scientist communicates his observations to other scientists.
D - When a scientist collects data, he or she record the data from an experiment. When a scientist analyzes the data, he or she decides whether or not the data support the hypothesis.
Answer:
I believe D is the best answer choice.
Explanation:
C is also a good answer but I feel like D most accurately describes the scientific method.
Answer:
C
Explanation:
its true and contains more academic words and i got it right
Solve. C3H8(g) + 5O2(g) --> 3CO2(g) + 4H2O(g)
What is the Enthalpy of reaction?
What is the total Enthalpy of Reactants and Products? (Kj/Mol)
Is this a endothermic or exothermic reaction?
Answer: hope this helps!
Explanation:
Specific heat capacity of a substance is the amount of heat required to raise the temperature by one degree Celsius of one gram of a substance. Therefore, the enthalpy of reaction is -2219.9KJ/mol and the reaction is exothermic reaction.
What is Enthalpy?Enthalpy term is basically used in thermodynamics to show the overall energy that a matter have. Mathematically, Enthalpy is directly proportional to specific heat capacity of a substances.
Mathematically,
C[tex]_3[/tex]H[tex]_8[/tex](g) + 5O[tex]_2[/tex](g) [tex]\rightarrow[/tex]3CO[tex]_2[/tex](g) + 4H[tex]_2[/tex]O(g)
Mathematically, the formula for enthalpy of a reaction can be given as
ΔH for reaction= 3 ×ΔH of CO[tex]_2[/tex] + 4 ×ΔH of H[tex]_2[/tex]O- ΔH of C[tex]_3[/tex]H[tex]_8[/tex]+ 5 ×ΔH of O[tex]_2[/tex]
= 3 ×393.5KJ/mol+ 4 ×285.8- 103.8+ 5 ×0
=-2219.9KJ/mol
The enthalpy of reaction is -2219.9KJ/mol. since the value of enthalpy has negative sign, the reaction is exothermic reaction.
Therefore, the enthalpy of reaction is -2219.9KJ/mol and the reaction is exothermic reaction.
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What happens when water turn’s into gas
Answer:
The process of turning water into gas is called evaporation. When water is heated, it changes state from a liquid to a solid. No mass is destroyed during the process, but rather, it is converted into gas.
Explanation:
Brainliest Plzzz!!!
A compound has the following composition by mass:
32% carbon, 6.7% hydrogen, 42.6% oxygen and 18.7% nitrogen
What is the empirical formula of the compound?
Answer:
i cry when im alone
Explanation:
Which statement about Earth's core helps explain Earth's magnetic field?
-Earth's core is composed of magnets.
-Earth's core is composed of iron and nickel.
-The outer core is solid,
-The inner core is liquid and moving
Answer:
it should be B. earths core is composed of iron and nickel, if not let me know.
Answer: B. Earth's core is composed of iron and nickel.
Explanation: The inner core is solid so C and D are incorrect and A is incorrect because the core isn't made of magnets so it has to be B.
Explain the difference between the organism, population, and community levels of ecological organization
Answer:
A population is a group of organisms belonging to the same species that live in the same area and interact with one another.
Explanation:
Levels of Ecological Organization
Level # 2. Population:
Level # 3. Community:
Level # 4. Ecosystem:
Level # 5. Biome:
Level # 6. Biosphere:
Calculate the minimum volume of oxygen
that is required for the complete combustion
of a mixture of 20cm3 of CO and 25cm3 of
hydrogen.
A. 45 cm3
B. 22.5cm3
C. 20 cm3
D. 10 cm3
Eukaryotes share which characteristic with prokaryotes?
•lysosomes
•vacuole
•mitochondria
•cell membrane
Answer:
cell membrane is the answer
Answer: cell membrane
Explanation:
Of the atoms below, __________ is the most electronegative.
PLZ HELP I'LL AWARD BRINLIEST.
Hello sir, The answer that you are looking for is fluorine. Fluorine is the most electronegative atom. I am also sorry for calling you sir. I didn't know you were a woman.
U
Question 13
4 pts
Using the formula Na + Cl2 --> NaCl, if 3.93 moles of chlorine are combined
with excess* sodium, how many moles of sodium chloride will be made? Note
that in this question, excess means extra or as much as you need.
Answer:
7.86 moles of sodium chloride are produced.
Explanation:
Given data:
Moles of chlorine = 3.93 mol
Amount of sodium = excess
Moles of sodium chloride formed = ?
Solution:
Chemical equation:
2Na + Cl₂ → 2NaCl
Now we will compare the moles of sodium chloride with chlorine.
Cl₂ : NaCl
1 : 2
3.93 : 2×3.93 = 7.86
Chlorine is limiting reactant that's why we compare the NaCl with only number of mole of chlorine.
Thus, 7.86 moles of sodium chloride are produced.
What is one way the lack of gravity in space affects the human body?
Please help ASAP
Answer:
Loss of muscle mass because there is no weight on the back and legs.
Explanation:
Which characteristic BEST identifies a pure substance?
a. shape
b. texture
c. melting point
d. state of matter
Whoever helps I will give BRAINLIEST
