Calculate the speed for a car that went a distance of 150 kilometers in 2 hours time. btw this is science
Answers
Answer:
The speed of the car is 75 km per hour
Explanation:
Speed is distance over time so 150 km divided by 2 hours is 75km per hour.
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Here is the electron configuration for Arsenic. What does the superscript 3 in 4pº tell
us?
Ar: 152 252 2p 352 3p6 452 310 4p3
Answers
The superscript 3 in 4pº tell that there are 3 electrons in this orbital
Further explanationIn an atom there are levels of energy in the shell and sub shell
This energy level is expressed in the form of electron configurations.
There are 4 sub-shells in the shell of an atom, namely s, p, d, and f. The maximum number of electrons for each sub-shell is
• s: 2 electrons
• p: 6 electrons
• d: 10 electrons and
• f: 14 electrons
Charging electrons in the sub-shell uses the following sequence:
1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶, 5s², 4d¹⁰, 5p⁶, 6s², etc.
Arsenic is an element with the symbol As, which has an atomic number of 33 and a mass number of 75
Electron configuration of As : [Ar] 3d¹⁰4s²4p³
Each superscript shows the number of electrons that occupy each orbital
For the p orbital there are a maximum of 6 electrons, while the 4p³ orbital shows that there are 3 electrons in this orbital
explain how both are in fact measurable for non-reactive systems. consider the first law in conjunction with slow heating at different constant conditions, where q can be quantified by coupling to a reference body. why does the constant-volume heat capacity naturally involve e, whereas the constant pres- sure one h?
Answers
Non-reactive systems are those that do not undergo any chemical changes. Even in such systems, enthalpy (H) and internal energy (U) can be measured.
The first law of thermodynamics states that the energy of the universe is constant. If a system undergoes a process, the energy transfer occurs either as heat or work. It is essential to understand the distinction between heat and work, which are the two methods of energy transfer. Heat, represented as q, is the energy transferred due to a temperature difference between the system and its surroundings. Heat transfer can be quantified by coupling the system with a reference body. On the other hand, work, represented as w, is the energy transferred due to a force acting over a distance. Work can be done on the system, or the system can do work on its surroundings. Heat and work are not state functions. They depend on the path of the process. The enthalpy (H) of a system is defined as the sum of its internal energy (U) and the product of pressure (P) and volume (V).H = U + PV
The internal energy (U) is the sum of the kinetic and potential energies of the molecules. Enthalpy change occurs due to the heat transfer at a constant pressure. The heat transfer at constant pressure is expressed as \(q_p\). The specific heat capacity of a substance is the amount of heat required to raise the temperature of one unit mass of the substance by one degree Celsius or Kelvin. The specific heat capacity is different for the constant volume and constant pressure processes. The constant-volume heat capacity is denoted as \(c_v\). In a constant volume process, the work done by the system is zero. Therefore, the internal energy change of the system equals the heat transfer to the system. For a non-reactive system, ΔU = \(q_v\), where \(q_v\) is the heat transfer at constant volume. Therefore, the constant-volume heat capacity can be expressed as \(c_v\) = ΔU/ΔT, where ΔT is the temperature change. The constant-pressure heat capacity is denoted as \(c_p\). In a constant pressure process, the energy transferred to the system is in the form of heat. The work done by the system is equal to PΔV. Therefore, the enthalpy change of the system is ΔH = ΔU + PΔV. The heat transfer at constant pressure is denoted as \(q_p\). Therefore, the constant-pressure heat capacity can be expressed as \(c_p\) = \(q_p\)/ΔT.In thermodynamics, the thermodynamic state variables are those whose values depend only on the thermodynamic state of the system, irrespective of the path taken to reach that state. Enthalpy is a state variable, whereas heat and work are not. Therefore, enthalpy can be used to measure the amount of heat transferred at a constant pressure. The constant-volume heat capacity naturally involves the internal energy change (ΔU), whereas the constant-pressure heat capacity naturally involves the enthalpy change (ΔH). Therefore, the constant-volume heat capacity involves ΔU in its expression, whereas the constant-pressure heat capacity involves ΔH in its expression.Learn more about the first law of thermodynamics: https://brainly.com/question/21864813
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A plane traveled for 2 hours at a speed of 1200 km/hr. What distance did it travel?
2000 km
600 km
1200 km
2400 km
Answers
Answer: 2400 km
Explanation: 1200 km/hr • 2 hr = 2400 km
HELPPPP PLEASE WILLLL GIVE BRIANLIESTTTT
Answers
We can use the formula M₁V₁ = M₂V₂ the total volume of water that will yield 0.800 M HCl. We can then subtract that from the initial volume to get how much water needs to be added.
Since M₁V₁ = M₂V₂ (starting mole× starting volume = end mole × end volume)
⇒ (5 mol)(20 mL) = (0.80 mol) V₂
100 mol/mL = 0.8 mol × V₂
⇒ V₂ = 100 mol/mL ÷ 0.8 mol
= 125 m
Since we began with 20.0 mL of water,
water needed to add = 125 mL - 20 mL = 105 mL
Consider the balanced reaction below:
P2O3 + 3H2O → 2H3PO3
How many grams of diphosphorus trioxide, P203, are required to produce 10.2 moles of phosphorous acid, H3PO3?
Answers
Answer:
5.1 moles of P2O3 are required
Explanation:
Based on the reaction, 1 mole of diphosphorus trioxide, P2O3, reacts with 3 moles of water to produce 2 moles of phosphorous acid, H3PO3. That means the conversion factor is: 1mol P2O3 = 2mol H3PO3.
The moles of P2O3 required to produce 10.2mol H3PO3 are:
10.2mol H3PO3 * (1mol P2O3 / 2mol H3PO3) =
5.1 moles of P2O3 are requiredGuys i need your advice i got D+ in chemistry should i tell my parents?
Answers
Answer:
yes
Explanation:
its the correct thing to do
Which best describes a radioactive isotope?
Answers
Answer:
A radioactive isotope, also known as a radioisotope, radionuclide, or radioactive nuclide, is any of several species of the same chemical element with different masses whose nuclei are unstable and dissipate excess energy by spontaneously emitting radiation in the form of alpha, beta, and gamma rays.
Answer:
unstable
Explanation:
The San Andreas fault is at the boundary between two tectonic plates. Earthquakes occur frequently along the fault as the plates slide past one another. The map below shows data on the intensity and location of earthquakes in California and Nevada during a one week period.
Image courtesy USGS
Which conclusion is supported by the data on the map?
A.
The most intense earthquake during the week was in California.
B.
More earthquakes were felt in Nevada than in California.
C.
Earthquakes along the fault were more frequent in the south than in the north.
Answers
Answer:
c.
earthquakes along the fault were more frequent in the south than in the north
What is true of a molecule of gaseous hydrogen (H2)?
Answers
The true statement of a molecule of gaseous hydrogen is It has no net charge. Therefore the correct option is option A.
A covalently bound pair of hydrogen atoms make up a gaseous hydrogen molecule (H2), which is a substance. This indicates that in order to create a stable molecule, the two hydrogen atoms share an electron.
H2 is the lightest and most prevalent element in the universe and is a diatomic gas at room temperature and atmospheric pressure. It has no colour, no smell, and is non-toxic.
Highly flammable H2 gas can be used as fuel for a variety of devices, including fuel cells, IC engines, and rockets. Another way to create H2 gas is through the electrolysis of water, reforming of natural gas, or gasification of coal. Therefore the correct option is option A.
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The following question may be like this:
What is true of a molecule of gaseous hydrogen (H2)? Multiple choice question.
It has no net charge.It has a partial positive charge.It has one partial positive charge and one partial negative charge which are balanced.what is the balanced equation for when calcium reacts with water to produce calcium hydroxide and hydrogen gas
Answers
Answer:
\(Ca + 2H{2} O = Ca(OH){2} +H{2}\)Explanation:
Which best explains what happens to energy when we see a spark on the van der graaf generator?
a. chemical energy is being stored
b. electrical potential energy is being converted into kinetic energy
c. electrical kinetic energy is being stored
d. chemical energy is being released
Answers
When we see a spark on the Van de Graaff generator, the best explanation is that electrical potential energy is being converted into kinetic energy. The Van de Graaff generator uses a belt and metal comb to transfer electrical charges. It creates a high voltage difference between the metal dome and the ground.
This buildup of electrical potential energy is released when a spark occurs. The spark is the result of the electrical charges overcoming the resistance between the dome and the ground. As the charges move from the dome to the ground, they gain kinetic energy and create a visible spark.
So, in this case, electrical potential energy is being converted into kinetic energy. This process happens due to the buildup and release of electrical charges.
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The half-life of K-42 is 12. 4 hours. How much of a 750 g sample is left after 62 hours?
Answers
After 62 hours, approximately 23.4375 grams of the 750 gram sample of K-42 is left.
To calculate the amount of K-42 remaining after 62 hours, we need to determine the number of half-lives that have passed and then calculate the remaining amount using the formula:
Remaining amount = Initial amount × (1/2)^(number of half-lives)
Given that the half-life of K-42 is 12.4 hours, we can divide the total time (62 hours) by the half-life to find the number of half-lives:
Number of half-lives = 62 hours / 12.4 hours = 5
Now, we can calculate the remaining amount:
Remaining amount = 750 g × (1/2)^5 = 750 g × (1/32) = 23.4375 g
Therefore, approximately 23.4375 grams of the 750 g sample of K-42 will be left after 62 hours.
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An organism can occupy more than one niche in an ecosystem
A) True
B) False
Answers
Answer T
Explanation:
True or false carbon-15 and nitrogen-15 are isotopes of each other
Answers
Answer:
Two different elements cannot be isotopes since they don't have the same number of protons even if they have the same number of neutrons.
which of the following compounds have integer i values? (select all that apply.) which of the following compounds have integer i values? (select all that apply.) kcl ch3cooh na2co3 hclo4
Answers
The following compounds have integer i values:KClNa2CO3
The following compounds have integer i values: KCl and Na2CO3.
i stands for van't Hoff factor and is the number of particles formed from one solute molecule in a solution.
An i value of 1 means that no particles are produced upon solvation or that the solute molecule exists independently in the solvent.
Conversely, an i value greater than one indicates that one molecule of solute produces more than one particle in the solvent. This includes molecules that dissociate into ions, form complexes, or exist in a solvent as aggregates.
It is worth noting that the i value is an experimentally derived value and may not necessarily be an integer.
According to the question, the following compounds have integer i values:KClNa2CO3
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What happens to wavelength as wave frequency increases?
Answers
Answer:
As a wavelength increases in size, its frequency and energy (E) decrease. From these equations you may realize that as the frequency increases, the wavelength gets shorter. As the frequency decreases, the wavelength gets longer.
Explanation:
If you wanted to dilute the 1.85 M solution to make 250 mL of 0.45 solution, how much 1.85 M solution would you need and how much water would you add to it
Answers
To make 250 mL of a 0.45 M solution by diluting a 1.85 M solution, you would need 58.11 mL of the 1.85 M solution and 191.89 mL of water.
To calculate the amount of the 1.85 M solution needed, we can use the formula:
M₁V₁ = M₂V₂
where M₁ is the initial concentration, V₁ is the initial volume, M₂ is the final concentration, and V₂ is the final volume.
Substituting the given values, we have:
(1.85 M)(V₁) = (0.45 M)(250 mL)
Solving for V₁, we get:
V₁ = (0.45 M)(250 mL) / (1.85 M) = 58.11 mL
Therefore, we need 58.11 mL of the 1.85 M solution.
To calculate the amount of water needed, we can subtract the volume of the 1.85 M solution from the final volume:
V₂ - V₁ = 250 mL - 58.11 mL = 191.89 mL
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Graded Assignment
SCI010: Environmental Science Unit 2 Lesson 20: Unit Test
(8 points)
Score
2. What is an environmental sphere or earth system sphere? Name the earth's five major environmental spheres
and state the defining characteristics of each. Give one example of a way in which two or more earth system
spheres interact.
Answer:
Answers
Answer:
Geosphere, biosphere, cryosphere, hydrosphere, and atmosphere
Explanation:
The environmental sphere refers to all physical entities other than products and corresponding flows. . Geosphere, biosphere, cryosphere, hydrosphere, and atmosphere are the five major environmental spheres. Geosphere consist of the rocks, minerals, and landforms of the surface and interior. Biosphere includes all living organisms present on earth surface. cryosphere refers to the solid water part of the earth. Hydrosphere refers to the water bodies such as river, lakes, sea and ocean etc and the atmosphere is the gaseous region of earth which is composed of many gases.
the equilibrium constant kp for the gas-phase thermal decomposition of tert-butyl chloride is 3.45 at 500 k: (ch3)3ccl(g)⇌(ch3)2c=ch2(g) hcl(g)
Answers
At 500 K, the equilibrium constant `K_p` for the gas-phase thermal decomposition of tert-butyl chloride is 3.45.
A chemical reaction proceeds in both forward and backward directions. At some point in time, the rate of forward and backward reaction becomes equal.
At this stage, the system is said to be in a state of equilibrium. When the concentration of products and reactants no longer changes, the reaction is said to have reached equilibrium.
Constant is the term that is used for the ratio of the concentrations of products to the concentrations of reactants at equilibrium.
This ratio is also called the Equilibrium Constant `(K)`. It is only used for reversible reactions and its value changes with changes in temperature.
What is the formula of Equilibrium Constant `K_p`?Equilibrium Constant `K_p` is defined as the ratio of the partial pressures of products and reactants when the reaction reaches equilibrium.
Mathematically, it is given as:`K_p = (P_A)^a * (P_B)^b / (P_C)^c * (P_D)^d`where `A` and `B` are products and `C` and `D` are reactants. `a`, `b`, `c` and `d` are the respective coefficients in the balanced chemical equation. `P` is the partial pressure of the given substance.Given equation for the thermal decomposition of tert-butyl chloride:`(CH3)3CCl(g) ⇌ (CH3)2C=CH2(g) + HCl(g)`
The Equilibrium constant `K_p` of the given equation at 500K is given as:`K_p = 3.45`
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If the Downs cell is run so that it generates 36,000 coulomb of charge, how many faraday of applied charge will be produced by the anode?
Answers
The need to remember the relationship between coulombs and faradays. One faraday is equal to 96,485 coulombs. So, if the Downs cell generates 36,000 coulombs of charge, we can divide that by the number of coulombs in a faraday to get the number of faradays produced.
The anode will produce 0.373 faraday of applied charge.36,000 coulombs ÷ 96,485 coulombs/faraday = 0.373 faradays To determine the number of Faradays of applied charge produced by the anode in the Downs cell, we'll first need to understand the relationship between Coulombs and Faradays. 1 Faraday is equal to the charge of 1 mole of electrons, which is approximately 96,485 Coulombs. Given that the Downs cell generates 36,000 Coulombs of charge, we can calculate the number of Faradays produced by the anode using the following formula Number of Faradays = Total charge Coulombs / Charge of 1 mole of electrons Coulombs Number of Faradays = 36,000 Coulombs / 96,485 Coulombs per Faraday Number of Faradays ≈ 0.373 Faradays So, the anode in the Downs cell will produce approximately 0.373 Faradays of applied charge when it generates 36,000 Coulombs of charge.
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How many significant figures are in 0.00030
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In a particular redox reaction, MnO2 is oxidized to MnO4– and Fe3 is reduced to Fe2 . Complete and balance the equation for this reaction in acidic solution. Phases are optional.
Answers
The Complete and balance the equation for this reaction in acidic solution is MnO₂ + 3 Fe³⁺ + 4 OH- -> MnO₄⁻ + 3 Fe²⁺ + 2 H₂O.
The reactants and products of a chemical reaction are represented symbolically in a chemical equation by the appropriate chemical formulas.
The inclusion of stoichiometric coefficients to the reactants and products is necessary to balance chemical equations. This is significant because a chemical equation must adhere to the laws of conservation of mass and constant proportions, meaning that both the reactant and product sides of the equation must include the same amount of atoms of each element.
The article discusses two quick and simple ways to balance a chemical equation. The classical balancing approach is the first, while the algebraic balancing method is the second.
Mn in MnO₂ has oxidation state of +4
Mn in MnO₄⁻ has oxidation state of +7
So, Mn in MnO₂ is oxidised to MnO4-
Fe in Fe⁺³ has oxidation state of +3
Fe in Fe⁺² has oxidation state of +2
So, Fe in Fe+3 is reduced to Fe+2
Reduction half cell:
Fe⁺³ + 1e- --> Fe⁺²
Oxidation half cell:
MnO₂ --> MnO₄⁻ + 3e⁻
Balance number of electrons to be same in both half reactions
Reduction half cell:
3 Fe³ + 3e⁻ --> 3 Fe⁺²
Oxidation half cell:
MnO₂ --> MnO₄⁻ + 3e⁻
Lets combine both the reactions.
3 Fe⁺³ + MnO₂ --> 3 Fe⁺² + MnO₄⁻
Balance Oxygen by adding water
3 Fe⁺³ + MnO₂ + 2 H₂O --> 3 Fe⁺² + MnO₄⁻
Balanced Equation is:
3 Fe+3 + MnO2 + 4 OH- --> 3 Fe+2 + MnO4- + 2 H2O
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How many atoms are there in 6.8g of S?
Answers
draw a detailed separation scheme for the isolation of caffeine from the ground tablets. upload a picture of your drawn separation scheme.
Answers
The separation scheme for the isolation of caffeine from the ground tablets include the steps: Grinding, Extraction, Filtration, Evaporation, Purification, Recrystallization and Drying.
Here is a detailed separation scheme for the isolation of caffeine from ground tablets. Here is a step-by-step procedure:
Grinding: Grind the tablets containing caffeine to a fine powder to increase the surface area for extraction.
Extraction: Perform multiple extractions using a suitable solvent, such as ethyl acetate or dichloromethane. Add the solvent to the powdered tablets and mix thoroughly. Allow the mixture to stand for some time to allow the solvent to dissolve the caffeine.
Filtration: Filter the mixture to separate the solid residue (containing excipients and impurities) from the solvent extract (containing caffeine).
Evaporation: Evaporate the solvent from the filtrate using a rotary evaporator or by allowing it to evaporate naturally. This will leave behind a crude caffeine residue.
Purification: Dissolve the crude caffeine residue in a minimal amount of a suitable solvent, such as hot water or ethanol. Filter the solution if necessary to remove any remaining insoluble impurities.
Recrystallization: Slowly cool the filtered solution to induce crystallization of pure caffeine. Collect the formed crystals by filtration and wash them with a small amount of ice-cold solvent to remove any impurities.
Drying: Allow the purified caffeine crystals to air dry or use a desiccator to remove any remaining moisture.
The resulting product should be relatively pure caffeine. Please note that this is a simplified outline, and specific details may vary depending on the specific extraction and purification techniques used.
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write the complete electron configuration for the common monatomic ion formed by the element sodium , na .
Answers
2,8,1
Explanation:
the atomic number of sodim is 11 so when we deal with configration it will be like 2,8,1
The following table lists the specific heat capacities of select substances:
Water (3110 {~g}) is heated until it just begins to boil. If the water absorbs 5.39 × 10^{5} {
Answers
The specific heat capacity of water is 4.18 J/(g K) and the given amount of water is more than 100 grams. We need to calculate the energy absorbed by the water to reach boiling point when 5.39 × 10^5 J of heat is supplied.
The amount of water used is not provided in the question, therefore, let's first calculate the energy required to raise the temperature of 100g of water from room temperature (25°C) to its boiling point (100°C) using the formula,Q = m × c × ΔTwhere,Q = energy absorbedm = mass of waterc = specific heat capacity of waterΔT = change in temperature of water= 100 - 25 = 75°C (since the water is heated until it just begins to boil)Thus,Q = \(100 g × 4.18 J/(g K) × 75°C= 31350 J= 31.35 kJ\) of energy is required to heat 100g of water from 25°C to 100°C.
Now, let's determine the mass of water using the amount of heat energy supplied:Q =\(m × c × ΔT, where Q = 5.39 × 10^5 Jm = Q / (c × ΔT)= 5.39 × 10^5 J / (4.18 J/(g K) × 75°C)= 204.55 g\)(approx.)Therefore, more than 100 g of water is required to absorb 5.39 × 10^5 J of heat to reach its boiling point.
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2 moles of NO, was placed in an empty I dm' bottle and allowed to reach equilibrium according to the equation:
At equilibrium, 1.2 moles of N,O, dissociated. Calculate the value of the equilibrium constant for the reaction at that
temperature.
Answers
2NO(g) ⇌ N2(g) + O2(g)
According to the problem statement, 2 moles of NO were placed in a 1 dm^3 bottle and allowed to reach equilibrium, and at equilibrium, 1.2 moles of NO had dissociated. This means that the initial concentration of NO was:
[NO]initial = 2 mol / 1 dm^3 = 2 M
And the concentration of NO at equilibrium is:
[NO]equilibrium = (2 - 1.2) mol / 1 dm^3 = 0.8 M
Since the stoichiometry of the balanced equation is 2:1:1 for NO, N2, and O2, respectively, the equilibrium concentrations of N2 and O2 will also be 0.6 M.
The equilibrium constant (Kc) can be calculated using the equilibrium concentrations of the reactants and products, raised to the power of their stoichiometric coefficients. Therefore:
Kc = ([N2][O2]) / ([NO]^2)
Substituting the equilibrium concentrations into the equation, we get:
Kc = (0.6 M x 0.6 M) / (0.8 M x 0.8 M)
Kc = 0.5625
Therefore, the value of the equilibrium constant for the reaction at that temperature is 0.5625. Note that the units of Kc depend on the stoichiometry of the balanced equation. Since the stoichiometric coefficients are all 1, the units of Kc in this case are M^-1
Why can’t a smartphone disappear completely in liquid acid?
Answers
Answer:
its metal because its metal
Question 77
Individuals particularly susceptible to the toxic effects of cadmium are those who are deficient in:
a. phosphorous
b. zinc
c. potassium
d. iron
Answers
The correct answer is b. Zinc. Cadmium can bind with zinc and replace it in important enzymes and proteins, leading to cell damage and toxicity. Individuals who are deficient in zinc are more susceptible to the toxic effects of cadmium.
People who lack certain necessary minerals, such as calcium, zinc, and iron, are more vulnerable to the harmful effects of cadmium. These necessary minerals can be replaced by cadmium, which will interfere with regular cellular processes. Cadmium, for instance, can compete with calcium, which is necessary for healthy muscle and nerve function, and can result in neurological symptoms including convulsions, muscular weakness, and other neurological symptoms. In enzymes and proteins, cadmium may also replace zinc and iron, causing a variety of harmful consequences such as stunted growth and development, anaemia, and weakened immunological response. To reduce the hazardous consequences of cadmium exposure, it is crucial to maintain appropriate amounts of these vital minerals.
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Which of the following best represents Boyle's Law?A) The pressure of a gas exerted on the walls of its container is directly proportional to the volume of the gas when the temperature of the gas remains constant.B) The volume of a gas inside a container is inversely proportional to the temperature of the gas when the pressure of the gas remains constant.C) The volume of a gas inside a container is directly proportional to the temperature of the gas when the pressure of the gas remains constant.D) The pressure of a gas exerted on the walls of its container is directly proportional to the temperature of the gas when the volume of the gas remains constant.E) The pressure of a gas exerted on the walls of its container is inversely proportional to the temperature of the gas when the volume of the gas remains constant.F)The pressure of a gas exerted on the walls of its container is inversely proportional to the volume of the gas when the temperature of the gas remains constant.
Answers
Answer
F) The pressure of a gas exerted on the walls of its container is inversely proportional to the volume of the gas when the temperature of the gas remains constant.
Explanation
Boyle's law states that the volume of a given mass of gas varies inversely with the pressure when the temperature is kept constant. An inverse relationship is described in this way. As one variable increases in value, the other variable decreases. He discovered that doubling the pressure of an enclosed sample of gas, while keeping its temperature constant, caused the volume of the gas to be reduced by half.