Answer:
Final concentration = 0.019 M
Explanation:
Initial Concentration [A]o = 0.27M
Rate constant, k = 0.75 s^-1
Final concentration [A] = ?
Time, t = 1.5s
The relationship between the variables is given by the equation;
ln[A] = ln[A]o - kt
ln[A] = ln(0.27) - (0.75)(1.5)
ln[A] = - 1.309 - 1.125
ln[A] = - 2.434
[A] = 0.019 M
How does the asthenosphere interact with the tectonic plates at a divergent boundary?
Answer:
Its D
Explanation:
Which reaction is represented by the net ionic equation for the combination of aqueous solutions of LiNO3 and NaC2H3O2?
Answer:
This question is incomplete
Explanation:
This question is incomplete but the completed question is in the attachment below. To determine the net ionic equation, one must first write the complete equation which is shown below
LiNO₃ + NaC₂H₃O₂ ⇒ LiC₂H₃O₂ + NaNO₃
The ionic equation represented from the above equation will be
Li¹⁺ NO₃⁻ + Na¹⁺ C₂H₃O₂¹⁻ ⇒ Li¹⁺ C₂H₃O₂¹⁻ + Na¹⁺NO₃¹⁻
Because the resultant NaNO₃ formed is an ionic compound (which does not form a molecule), the correct option from the options provided is the first option
A sample of air at 58.6 kPa is expanded from 250 mL to 655 mL. If thetemperature remains constant, what is the final pressure in kPa?
Answer:
22.366 kPaExplanation:
The final pressure can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
Since we are finding the final pressure
[tex]P_2 = \frac{P_1V_1}{V_2} \\[/tex]
From the question
58.6 kPa = 58600 Pa
We have
[tex]P_2 = \frac{58600 \times 250}{655} = \frac{14650000}{655} \\ = 22366.4122... \\ = 22366[/tex]
We have the final answer as
22.366 kPaHope this helps you
The lattice energy for ionic crystals increases as the charge on the ions _____________ and the size of the ions __________________.
a. increases, increases
b. increases, decreases
c. decreases, increases
d. decreases, decreases
e. none of these ,is generally correct
Answer:
b. increases, decreases
Explanation:
For an ionic compound ( ionic crystal), the lattice energy accounts for the crystal lattice's cohesion energy.
The lattice energy is the change in molar enthalpy associated with the reaction of the formation of gas ions from a mole of crystal.
This means that the lattice energy is needed to split the bond between particles of a solid ionic crystal and change the atoms into gaseous ions.
The smaller the atom size, the more heat energy required to split the bond, and the larger the atom size, the lesser heat required.
The charge on the atom also affects the behavior of ionic crystals. In essence, the higher the charge on the atom, the more difficult to split the bond, and the lesser the charge on an atom, the easier it is to split the bond.
Thus, we can conclude that the lattice energy for ionic crystals increases as the ions' charge increases, and the size of the ions decreases.
At high temperatures, sulfur combines with iron to form brown-black iron(II) sulfide:
Fe(s) + SD-Fes(s)
In an experiment, 5.00 g of iron reacts with excess sulfur to produce 6.29 g of iron(II) sulfide. Calculate the percent yield if the maximum
amount of iron(II) sulfide that can be produced is 7.87 g.
79.796
79.9%
100%
63.5%
125%
The percent yield : 79.9%
Further eplanationPercent yield is the comparison of the amount of product obtained from a reaction with the amount you calculated
General formula:
Percent yield = (Actual yield / theoretical yield )x 100%
An actual yield is the amount of product actually produced by the reaction. A theoretical yield is the amount of product that you calculate from the reaction equation according to the product and reactant coefficients
Reaction
Fe(s)+S(s)⇒FeS(s)
The reaction produces 6.29 g of iron(II) sulfide⇒an actual yield
The maximum amount that can be produced is 7.87 g ⇒ A theoretical yield
[tex]\tt \%yield=\dfrac{actual}{theoretical}\times 100\%\\\\\%yield=\dfrac{6.29}{7.87}\times 100\5=79.9\%[/tex]
There are many ways of generating electrical energy. Research three of the following, describe how they work, and discuss the pros and cons of each of the three chosen electrical power plants:
thermal power plant (aka coal power plant)
nuclear power plant
solar power plant
hydroelectric power plant
geothermal power plant
tidal power plant
wind farms
Answer: Thermal Power Plant 1. A thermal power station is a power station in which heat energy is converted to electric power. In most, a steam-driven turbine converts heat to mechanical power as an intermediate to electrical power. Water is heated, turns into steam and drives a steam turbine which drives an electrical generator.
Nuclear Power Plant 2. A nuclear power plant is a thermal power station in which the heat source is a nuclear reactor. As is typical of thermal power stations, heat is used to generate steam that drives a steam turbine connected to a generator that produces electricity.
Solar Power Plant 3. Solar thermal power/electric generation systems collect and concentrate sunlight to produce the high temperature heat needed to generate electricity. ... Solar thermal power plants may also be hybrid systems that use other fuels (usually natural gas) to supplement energy from the sun during periods of low solar radiation.
Hydroelectric Power Plant 4. The most common type of hydroelectric power plant is an impoundment facility. An impoundment facility, typically a large hydropower system, uses a dam to store river water in a reservoir. Water released from the reservoir flows through a turbine, spinning it, which in turn activates a generator to produce electricity.
Geothermal Power Plant 5. At a geothermal power plant, wells are drilled 1 or 2 miles deep into the Earth to pump steam or hot water to the surface. ... When the water reaches the surface, the pressure is dropped, which causes the water to turn into steam. The steam spins a turbine, which is connected to a generator that produces electricity.
Tidal Power Plant 6. There are very few commercial-sized tidal power plants operating in the world. The first was located in La Rance, France. The largest facility is the Sihwa Lake Tidal Power Station in South Korea. The United States has no tidal plants and only a few sites where tidal energy could be produced at a reasonable price.
Wind Farm 7. Wind turbines work on a simple principle: instead of using electricity to make wind—like a fan—wind turbines use wind to make electricity. Wind turns the propeller-like blades of a turbine around a rotor, which spins a generator, which creates electricity.
Explanation:
To solve this we must be knowing each and every concept related to thermal power plant. Therefore, in the below given ways, three ways of producing electricity is discussed.
What is thermal power plant?A power plant that converts heat energy into electric power is known as a thermal power station. Most often, a steam-driven turbine turns heat into mechanical power as a step toward creating electricity.
Systems for generating electricity using solar thermal energy collect and start concentrating sunlight to create the high-temperature heat required to produce electricity.
An impoundment facility is the kind of hydroelectric plant that is most prevalent. A dam is used in an impoundment facility, which is usually a big hydroelectric system, to hold stream water in a reservoir.
Therefore, in the above given ways, three ways of producing electricity is discussed.
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If 4.74 g of propane is allowed to completely combust, calculate the mass of carbon dioxide formed at the end. Remember the units
Answer:
14.2g
Explanation:
The reaction expression is given as:
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
Given mass of propane combusted;
4.74g
Unknown:
Mass of carbon dioxide produced = ?
Solution:
To solve this problem, we find the number of moles of the given propane;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of C₃H₈ = 3(12) + 8(1) = 44g/mol
Number of moles = [tex]\frac{4.74}{44}[/tex] = 0.11mol
From the balanced reaction equation:
1 mole of C₃H₈ will produce 3 moles of CO₂
0.11mole of C₃H₈ will produce 3 x 0.11 = 0.33mole of CO₂
Mass of CO₂ = number of moles x molar mass
Molar mass of CO₂ = 12 + 2(16) = 44g/mol
Mass of CO₂ = 0.33 x 44 = 14.2g
Use the chemical equation below to determine how many moles of ammonia
(NH) will be produced from 4 moles of nitrogen gas (N). Assume that there is enough H, for all of the N, to be converted to NHs.
N2 + 3H2 → 2NH
A- 3 moles
B- 8 moles
C- 4 moles
D- 2 moles
Answer:
If we assume that there will be enough Hydrogen for the reaction to occur, then there will be 8 moles of NH
Explanation:
The balanced equation will look like this:
4N2 + 4H2 -> 8NH
List the three subatomic particles. Give the relative masses and charges of each (sorry for putting it in college TvT)
Answer:
Explanation:
The electron is subatomic particle that revolve around outside the nucleus and has negligible mass. It has a negative charge.
relative charge = -1
Relative mass = 1.1836
It was discovered by j. j. Thomson in 1897 during the study of cathode ray properties.
He constructed the glass tube and create vacuum in it. He applied electric current between electrodes. He noticed that a ray of particles coming from cathode to wards positively charged anode. This ray was cathode ray.
Properties of cathode ray:
The ray is travel in straight line.
The cathode ray is independent of composition of cathode.
When electric field is applied cathode ray is deflected towards the positively charged plate.
Hence it was consist of negatively charged particles.
While neutron and proton are present inside the nucleus. Proton has positive charge while neutron is electrically neutral. Proton is discovered by Rutherford while neutron is discovered by James Chadwick in 1932.
Relative mass of proton= 1
Relative mass of neutron = 1
Relative mass of proton = +1
Relative charge of neutron = 0
The number of electron or number of protons are called atomic number while mass number of an atom is sum of protons and neutrons. The umber of protons and electrons are always equal to make the atom electrically neutral.
PLEASE HELP ASAP
An element has 24 protons and 20 electrons. What is the chemical symbol?
Answer:
Br
Explanation:
Consider the following reaction at equilibrium :
NO_2 (g)+CO (g)↔NO(g)+CO_2 (g) . suppose the volume of the system is decreased at a constant temperature, what change will this cause in the system?
Answer: No shift will occur
I need the full reason
If the volume of the system is decreased, no shift will occur
Further explanationIn the equilibrium system, according to Le Chatelier, if there is a reaction there will be action
Reaction = - action
The reaction taken by the system is to shift the reaction to the right or left.
The composition of chemical reactions in equilibrium can be influenced by temperature, pressure, and concentration.
While on the change in pressure(volume), then the addition of pressure, the reaction will shift towards a smaller reaction coefficient ((the fewest moles of gas )
This pressure usually affects the gas equilibrium system(only count the number of moles of gases)
Reaction
NO₂ (g)+CO (g)↔NO(g)+CO₂(g)
The reactant side of the equation has 2 moles of a gas(1 mole NO₂ and 1 mole CO) ; the product side has 2 moles (1 mole NO and 1 mole CO₂)
So the total number of moles from both sides is the same(2 moles) so that the change in volume (pressure) does not change the direction of equilibrium⇒No shift will occur
Please help. What masses of KCl and H2O are needed to make 250 g of 5.00 % solution?
____ g of KCl
____ g of H2O
Answer:
Therefore, in a 250 g of solution, 5% needs to be KCl, i.e. 5% x 250 = 12.5 g of KCl is needed.
Explanation:
Nuclide A has a half-life of 4 days, and nuclide B has a half-life of 16 days. At the beginning of an experiment, a sample contains 2 nuclei of nuclide A and 218 nuclei equal of nuclide B. How long will it take before the numbers of nuclei of the two nuclides are equal?
Answer:
can't say...... . . please make me as brainlist
Answer: ladadadadadadasasasasassassaasss
Explanation:
i poop my pants
For an electron that interacts with visible light, which visible photon would give the most accurate (lowest error) measurement of momentum (or speed)?
blue
yellow
green
orange
violet
Answer:
violet
Explanation:
When an electron interacts with visible light, energy is transferred from the photon to the electron.
The most accurate (lowest error) measurement of momentum (or speed) of an electron is obtained using a photon of high energy and low wavelength.
Violet light which lies at the high energy end of spectrum is most suitable.
what is the reaction of guanine and adenine
Complementary Base Pairing. Specific pairs can only go together, so when guanine and adenine pair up, its Complementry Base Pairing :)
Hope this helps! Please correct me if im wrong :)
Which statement best explains the relationship between cellular respiration and photosynthesis? Cellular respiration breaks down glucose, while photosynthesis builds glucose. Photosynthesis breaks down glucose, while cellular respiration builds glucose. Both photosynthesis and cellular respiration break down glucose. Both photosynthesis and cellular respiration build glucose.
Answer:
I think both photosynthesis and cellular respiration breaks down glucose
Explanation:
sorry if i'm wrong
Answer:
c
Explanation:
both photosynthesis and cellular respiration brakes down glucoso
Land is a natural resource because it is used by living things to meet their needs. O True
O False
Answer:
Absolutely True :) cause we use it all the time
Land is a natural resource because it is used by living things to meet their needs. The given statement is true.
What is natural resource?Natural resources are important commodities and are used on a global scale. This includes the extraction and purification procedures that allow for their usage in economic production or consumption. Land is a natural resource.
Natural resources can be either renewable (meaning there will eventually be more supply available after they are refilled) or non-renewable (meaning there won't be any more available supply to be harvested from once they run out). Land is a natural resource because it is used by living things to meet their needs. The given statement is true.
Therefore, the given statement is true.
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Waves of sound energy move ________ ___ ____ ___________ from the source.
Answer:
are there any options for us to choose from? or is it just fill in the blank
Waves of sound energy move in the form of vibration from the source of sound energy.
What is waves?Waves is a kind of disturbance that can travel through a medium from one point to another point.
Sound waves is also a type of wave in which energy is travelled from one point to another point through the vibration from the source of sound.
Hence energy travel in the form of vibration.
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Calculate the energy of a photon having a wavelength of 7.71 x 10^-5 m.
Answer:
Calculate the energy of a photon having a wavelength of 7.71 x 10^-5 m.
Explanation:
Energy travels in what direction?
Which one of the following orbitals in an atom has the lowest energy: a. 6p b. 4f C. 5d d. 7s
got banned for a while sorry everyone ill answer your questions :(
Answer:
I have been banned before too, it is not fun :(
Explanation:
this is actually my fourth account cause I also had some deleted
Which pair of elements have the same valence electronic configuration of np³?
(a)O and Se (b)Ge and Pb (c)P and Sb (d)K and Mg (e)Al and Ga
Answer:
(c) P and Sb
Explanation:
We can determine the number of valence electrons of an element:
If it belongs to Groups 1 and 2, the number of valence electrons is equal to the number of group and the differential electron occupies the s subshell.If it belongs to the groups 13-18, the number of valence electrons is equal to: "Number of group - 10" and the differential electron occupies the p subshell.Which pair of elements have the same valence electronic configuration of np³?
(a) O and Se. NO. They belong to the group 16 and the valence electron configuration is ns² np⁴.
(b) Ge and Pb. NO. They belong to the group 14 and the valence electron configuration is ns² np².
(c) P and Sb. YES. They belong to the group 15 and the valence electron configuration is ns² np³.
(d) K and Mg. NO. They belong to the groups 1 and 2 and the valence electron configuration is ns¹ and ns².
(e) Al and Ga. NO. They belong to the group 13 and the valence electron configuration is ns² np¹.
The pairs of elements that contain the similar valence electronic should be option (c) P and Sb
Valence electronic configuration:In the case when it belongs to Groups 1 and 2, the no of valence electrons should be equivalent to the number of groups and the differential electron occupies the s subshell. On the other hand, in the case when it belongs to the groups 13-18, the number of valence electrons should be equivalent to "Number of group - 10" and the differential electron occupies the p subshell.
This question is incomplete. Please find the completed question below.
Which pair of elements have the same valence electronic configuration of np³?
(a) O and Se. NO. They belong to the group 16 and the valence electron configuration is ns² np⁴.
(b) Ge and Pb. NO. They belong to the group 14 and the valence electron configuration is ns² np².
(c) P and Sb. YES. They belong to the group 15 and the valence electron configuration is ns² np³.
(d) K and Mg. NO. They belong to the groups 1 and 2 and the valence electron configuration is ns¹ and ns².
(e) Al and Ga. NO. They belong to the group 13 and the valence electron configuration is ns² np¹.
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Write the net ionic equation. An aqueous solution of sodium carbonate is added to an aqueous solution of calcium chloride. Calcium carbonate is precipitated
Answer:
Ca + CO₃²⁻ → CaCO₃
Explanation:
Solution:
Sodium carbonate = Na₂CO₃
Calcium chloride = CaCl₂
Calcium carbonate is precipitated
Reaction equation:
Na₂CO₃ + CaCl₂ → CaCO₃ + 2NaCl
The net ionic equation:
2Na⁺ + CO₃²⁻ + Ca + 2Cl⁻ → CaCO₃ + 2Na⁺ + Cl⁻
the spectator ions which both appears on both sides will cancel out and leave behind the net ionic equation:
Ca + CO₃²⁻ → CaCO₃
HELP ASAPP
Use the periodic table to choose the pair of elements whose properties are most
similar.
A. Silicone (SI), Phosphorous (P)
B. Chlorine (CI), Iodine (1)
C. Potassium (K), Magnesium (Mg)
D. Neon (N), Sulfur (S)
Answer:
B.chlorine (Cl), iodine (I)
How do you think the size of an atom will affect its ability to attract additional electrons?
What do good electrical conductors and thermal conductors have in common?
Write a paragraph.
Answer:
A material that readily transmits energy is a conductor, while one that resist energy transfer is called an insulator. There are different types of conductors and insulators because there are different forms of energy. Materials that conduct electrons, protons, or ions are electrical conductors. They conduct electricity. Usually, electrical conductors have loosely bound electrons. Materials that conduct heat are thermal conductors. Substances that transfer sound are acoustical conductors. There are corresponding insulators for each type of conductor.
Explanation:
Electrical conductors and thermal conductors have loosely bound electrons. These are the materials that conduct heat.
Electrical conductors and thermal conductors:Electrical conductivity is a measure of how well electrical current can pass through a material under the influence of an applied electric field. Thermal conductivity measures how well heat can pass through a material under a temperature difference. Materials that are good conductors of heat and electricity. Thermal insulators do not transfer energy, but thermal conductors do.
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In a reaction, 25 g of reactant AB breaks down into 10g of Product A and an unknown amount of Product B. What is the mass of product B?
Answer:
Mass of product B = 15g
Explanation:
Reaction:
AB → A + B
Mass of AB = 25g
Mass of A = 10g
Unknown:
Mass of B = ?
Solution:
Based on the law of conservation of matter "matter is neither created nor destroyed but transformed from one form to another in a chemical reaction".
The amount of product = amount of reactant
Mass of AB = Mass of A + Mass of B
Now;
Mass of Product B = Mass of AB - Mass of A
Mass of product B = 25 - 10 = 15g
Mass of product B = 15g
You are the medical examiner at the scene of a murder at a restaurant. There is a
suspicion that the victim was poisoned. Their blood contained the following %
composition 80.66%-c, 7.39%-H, 9.39 %-N, and 2.68%-o Which of the following
compounds was the cause of the murder?
The compound : C₄₀H₄₄N₄O
Further explanationThe empirical formula is the smallest comparison of atoms of compound =mole ratio of the components
The principle of determining empirical formula
• Determine the mass ratio of the constituent elements of the compound.
• Determine the mole ratio by dividing the percentage by the atomic mass
The mol ratio of composition : C : H : N : O
[tex]\tt \dfrac{80.66}{12}\div \dfrac{7.39}{1}\div \dfrac{9.39}{14}\div \dfrac{2.68}{16}\\\\6.722\div 7.39\div 0.671\div 0.1675\rightarrow divide~by~smallest(0.1675)\\\\40\div 44\div 4\div 1[/tex]
need help please ,thx
Answer:
can you get a picture that is in higher quality? we can't read what it's saying