I WILL MARK BRAINLIEST How could this sentence be re-written to convey the active voice?
The landscape was carefully painted by the artist.
A) The landscape was painted.
B) The landscape was painted by the artist.
C) The artist carefully painted the landscape.
D) The beautiful landscape was carefully painted by the talented artist.
Answer:
The answer is C) The artist carefully painted the landscape.
Explanation:
Which of the following is essential for a theory to become widely accepted within the scientific community? (2 points)
A theory must include a valid scientific model.
A theory must be supported by many different experiments.
A theory is an educated guess based on multiple observations.
A theory must change over time regardless of the scientific data.
Answer:
A theory must be supported by many different experiments.
Explanation:
It is important for a theory to be tested by different independent science labs. When the same data are observed only then the theory reaches a consensus in the scientific community. A theory is based on evidence and not on educated guess. A scientific theory withstands rigorous scrutiny before it becomes accepted by the scientific community. Hence option B in correct.
Consider the data presented below. time (s) 0 40 80 120 160 moles of a 0.100 0.067 0.045 0.030 0.020 part a part complete determine whether the reaction is first order or second order. determine whether the reaction is first order or second order. this is the first order reaction. this is the second order reaction. submitprevious answers correct part b what is the rate constant?
The reaction is likely first order as indicated by the provided rate constant which aligns with the characteristics of a first-order reaction.
Explanation:To determine whether the reaction is first order or second order, we need to consider the rate at which the concentration of A changes over time. For a first order reaction, the rate of reaction is directly proportional to the concentration of the reactant. This means that if you were to plot the natural logarithm (ln) of the concentration of A versus time, you would see a linear relationship.
In contrast, a second order reaction implies that the rate is proportional to the square of the concentration of the reactant. Here, plotting the inverse of the concentration of A versus time would yield a linear relationship.
Given that the rate constant for the reaction is expressed as k = 1.0 × 107 L mol−1 min−1, this is indicative of a first order reaction, as it does not include a squared concentration term. Therefore, based on the provided information, the reaction is first order.
A colorless, toxic, radioactive gas is called what
Radon is an invisible, odorless noble gas that is released from the ground, emerging from the decay of uranium and thorium in soils. It is chemically inert but radioactively harmful, being a leading cause of lung cancer behind smoking. Radon typically infiltrates buildings through structural openings and can accumulate in enclosed spaces.
Radon is a naturally-occurring, colorless, odorless, and toxic noble gas that is the subject of the question. It emerges from the decay of uranium and thorium found in various soils and can accumulate in indoor environments such as homes. Radon is radioactively unstable and breaks down into other radioactive elements that can damage lung tissue and potentially lead to lung cancer, making it a significant health concern.
Radon is the primary source of indoor air pollution and the second leading cause of lung cancer in the U.S., particularly among nonsmokers. The gas usually enters buildings through cracks in foundations, walls, and floors, and can even be emitted from building materials or water from wells.
It was discovered in 1900 by Friedrich Earns Dorn and originally named niton. The most stable isotope of radon, Radon-222, is an alpha decay product of Radium-226 and is part of the uranium-238 decay chain.
convert 4540 grams of gold to moles of gold
To calculate moles , we divide mass of the substance given by the molar mass of the substance.
That can be mathematically represented as:
[tex] Number of moles of a substance= \frac{Given mass of a substance}{ Molar mass of substance} [/tex]
Here given mass of substance is 4540 g
Molar mass of the substance is 196 g mol⁻¹
So number of moles can be calculated as:
[tex] Number of moles of a substance= \frac{Given mass of a substance}{ Molar mass of substance} [/tex]
[tex] Number of moles of gold= \frac{4540}{196} [/tex]
So number of moles of gold =23.16 mol
Check my answers please? Only 5 multiple choice questions. I'm really confused. Any and all help is appreciated! Will give medal!
1. Which of the following is a correctly written thermochemical equation?
NH4Cl NH4+ + Cl
2C8H18 + 25O2 16CO2 + 18H2O, H = 5,471 kJ/mol
Fe (s) + O2 (g) Fe2O3 (s), H = 3,926 kJ
-->C3H8 (g) + 5O2 (g) 3CO2 (g) + 4H2O (l), H = 2,220 kJ/mol
2. How does a phase change affect a thermochemical equation?
It alters the moles of reactants.
-->It can affect the (delta) H value.
It alters the products.
It affects the balance of the equation.
Consider separate 1.0-l gaseous samples of h2, xe, cl2, and o2 all at stp.
a. rank the gases in order of increasing average kinetic energy.
b. rank the gases in order of increasing average velocity.
c. how can separate 1.0-l samples of o2 and h2 each have the same average velocity?
All gases at the same temperature have the same average kinetic energy. The average velocity of gases increases with decreasing molar mass. Thus, 1.0-L samples of O2 and H2 can have the same velocity because velocity is also affected by temperature.
Explanation:The kinetic energy of a gas is determined by its temperature, not by the identity of the gas itself. This is explained by the Kinetic Molecular Theory. Because all four gases are at the same temperature (standard temperature), they have the same average kinetic energy.
However, the average velocity of the gases varies depending upon the molar mass of the gas. The lighter the gas (lower molar mass), the faster it moves. Thus, the order of increasing velocity is Xe < Cl2 < O2 < H2.
To answer part c, the reason why 1.0-L samples of O2 and H2 can each have the same average velocity despite being different substances is because the average velocity of a gas depends not only on its mass, but also the temperature at which it is measured. As these two samples are both at the same temperature, they can have the same average velocity.
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Which term is defined as the change in the direction of light when it goes from one medium into a different medium?
Question options:
Reflection
Refraction
Diffraction
Absorption
it is b refraction bro.
I looked in science book.
TRUST ME.
#1: Jim, Jane, Ann, and Bill measure an object’s length, density, mass, and volume, respectively. Which student’s measurement might be in centimeters?
A. Bill’s
B. Jane’s
C. Jim’s
D. Ann’s
**MY answer: C. Jim's
#2: How many centimeters are in 0.05 kilometers?
A. 50
B. 500
C. 5,000
D. 50,000
***My answer: C. 5,000
The ionization of pure water forms _____.
Answer: The ionization of pure water forms hydroxide and hydronium ions.
Explanation:
Ionization is a reaction in the pure water in which water breaks down into its constituting ions that hydronium ion and hydroxide ions.
[tex]H_2O+H_2O\rightleftharpoons H_3O^++OH^-[/tex]
One molecule of water looses its proton to form hydroxide ion and l=the lost protons get associated with another water molecule to form hydronium ion.
How many moles of H2So4 are in 2.50 L of 4.25 M aqueous solution?
Which of the following statements best describes Kepler's law of ellipses?
Each planet orbits the sun in an elliptical shape with the sun at one of the ellipse's two focal points.
An ellipse has two focal points. The sun is at one focal point of an ellipse. The other focal point is the planet that orbits the sun.
The planets orbit the sun in a perfect circle. The sun is an elliptical shape.
Planets must orbit the sun in an elliptical shape because an ellipse has two focal points.
Answer : Each planet orbits the sun in an elliptical shape with the sun at one of the ellipse's two focal points.
Explanation:
Kepler's Law of ellipses: This law explains the path of the planet around the sun
The orbit of the planet around the sun is an ellipse shape, where sun is present on the one of the focus.
From the given options the correct option is:
Each planet orbits the sun in an elliptical shape with the sun at one of the ellipse's two focal points.
Write a chemical equation that illustrates the autoionization of water -g.com
Which of these choices is a goal of the Soil and Water Resources Conservation Act?
A. To establish a federal bureau that regulates the use of federal areas
B. To establish air-quality standards and regulate emissions of air pollutants
C. To assess the conservation of soil and water resources on private lands
D. To limit the carbon emissions of fossil fuel power plants
Answer:
A
Explanation:
According to the concept of the tragedy of the commons, what happens to shared resources over time?
A. They are safeguarded.
B. They are sold for profit.
C. They are protected from degradation.
D. They are depleted.
According to the concept of the Tragedy of the Commons, shared resources over time: D. would become depleted.
What is Tragedy of the Commons?Tragedy of the Commons refers to an economic situation in which individuals with access to a shared resource act in their own selfish interest while retroactively depleting this resource.
This ultimately implies that, the Tragedy of the Commons is an economic problem which is caused due to overconsumption by individuals sharing a common resource and it eventually leads to the depletion of the resource.
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If a balloon at 10 oC goes from 30L to 2L, what is the final temperature?
Question 4 options:
18.87
4.72
0.21
16,980.00
8490.00
Complete combustion of a 0.350 g sample of a compound in a bomb calorimeter releases 14.0 kJ of heat. The bomb calorimeter has a mass of 1.20 kg and a specific heat of 3.55 J/(gi°C). If the initial temperature of the calorimeter is 22.5°C, what is its final temperature?
The final temperature of the calorimeter is 25.8 °C
From the question given above, the following data were obtained:
Mass (M) = 1.2 Kg = 1.2 × 1000 = 1200 gHeat released (Q) = 14 KJ = 14 × 1000 = 14000 JInitial temperature (T₁) = 22.5 °CSpecific heat capacity (C) = 3.55 J/gºCFinal temperature (T₂) =?Q = MC(T₂ – T₁)
14000 = 1200 × 3.55(T₂ – 22.5)
14000 = 4260(T₂ – 22.5)
Clear bracket
14000 = 4260T₂ – 95850
Collect like terms
14000 + 95850 = 4260T₂
109850 = 4260T₂
Divide both side by 4260
T₂ = 109850 / 4260
T₂ = 25.8 °C
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Ionic bonds, such as in sodium chloride, __________.
How much energy is evolved during the formation of 197 g of fe, according to the reaction below? fe2o3(s) + al(s) → al2o3(s) + fe(s) δh°rxn = -852 kj?
Answer : The energy evolved in the reaction is 1499.52 kJ
Explanation : Given,
Mass of Fe = 197 g
Molar mass of Fe = 56 g/mole
Enthalpy of reaction = -852 kJ
First we have to calculate the moles of Fe.
[tex]\text{ Moles of Fe}=\frac{\text{ Mass of Fe}}{\text{ Molar mass of Fe}}=\frac{197g}{56g/mole}=3.52moles[/tex]
Now we have to calculate the energy evolved in the reaction.
From the balanced chemical reaction we conclude that,
As, 2 mole of Fe evolved energy = 852 kJ
So, 3.52 mole of Fe evolved energy = [tex]\frac{3.52}{2}\times 852kJ[/tex]
= 1499.52 kJ
Therefore, the energy evolved in the reaction is 1499.52 kJ
for acidic solutions, which element is added to balance half-reactions
CHEMISTRY HELP!:
Neon has an average atomic mass of 20.2 g/mol, whereas argon has an average atomic mass of 40.0 g/mol. How would the number of atoms in a 1.0 mol sample of neon compare to the number of atoms in a 4.0 mol sample of argon? (2 points)
A. The argon sample would have the same number of atoms as the neon sample.
B. The argon sample would have twice as many atoms as the neon sample.
C. The argon sample would have four times as many atoms as the neon sample.
D. The argon sample would have eight times as many atoms as the neon sample.
Answer: C. The argon sample would have four times as many atoms as the neon sample.
Explanation:
According to avogadro's law, 1 mole of every substance weighs equal to the molecular mass and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
1 mole of neon [tex]Ne[/tex] contains=[tex]6.022\times 10^{23[/tex] atoms
1 mole of argon [tex]Ar[/tex] contains=[tex]6.022\times 10^{23[/tex] atoms
Thus 4 moles of argon [tex]Ar[/tex] contains=[tex]\frac{6.022\times 10^{23}}{1}\times 4=24.09\times 10^{23}[/tex] atoms
Thus the argon sample would have four times as many atoms as the neon sample.
What pressure will be exerted by 0.650 mol of a gas at 30.0C if it is contained in a 0.700 L vessel?
Watersheds are sloped areas of land that ?
A. Channel precipitation runoff into bodies of water
B. Do not allow water to soak into the ground
C. Allow the aquifers to be recharged
The following reaction is balanced, True or False? P4 + 2 O2 → 2 P2O3 True False
How many liters of a 0.30M solution are needed to give 2.7 moles of solute?
Final answer:
To find the volume of a 0.30M solution needed for 2.7 moles of solute, use the formula Volume = moles / Molarity. The result is 9 liters.
Explanation:
The question asks to calculate the volume of a 0.30M solution required to obtain 2.7 moles of solute. Using the formula for molarity (M = moles of solute / liters of solution), we rearrange the formula to solve for the volume (liters) of the solution:
Volume (L) = moles of solute / Molarity (M)
Plugging into the formula:
Volume (L) = 2.7 moles / 0.30M
This gives us:
Volume (L) = 9 Liters
To verify, we multiply the calculated volume by the given molarity:
2.7 moles = 9 Liters * 0.30M
The calculation confirms that 9 Liters of a 0.30M solution contains 2.7 moles of solute, so the answer is correct.
How many more valence electrons does oxygen need to have a full outer valence shell?
If 5.10 g of acetic acid is reacted, how many grams of water can form?
Which of the following compounds has the highest boiling point?
2-pentanone
pentene
chloropentane
pentane
Answer: chloropentane
Explanation:
When a hydrocarbon has a halogen atom, its properties will change because this group has a higher molecular weight and a higher polar moment that will be hard to defeat in order to reach the boiling point.
The Boiling point of the pentene is 30°C // pentane is 36,1°C // 2-pentanone is 101°C and chloropentane 108°C.
Simple hydrocarbons have lower boiling points compare with those with a functional group like the Oxygen in the 2-pentanone and the Chlorine in the chloropentane. On the other heand, Oxygen is not as electronegative and heavy like Chlorine, thus the chloropentane is the one with higher boiling point.
If one has a solution of 0.10 m silver nitrate and it is diluted by a factor of two, what is the new concentration
Final answer:
When a 0.10 M silver nitrate solution is diluted by a factor of two, the new concentration becomes 0.05 M. This is calculated by halving the original concentration because the volume of the solution has doubled.
Explanation:
If one starts with a solution of 0.10 M silver nitrate (AgNO3) and it is diluted by a factor of two, the process of dilution reduces the concentration of the solution by half. Therefore, the new concentration of the silver nitrate solution after dilution will be 0.05 M. This is because when the volume of a solution is doubled (which is what happens when a solution is diluted by a factor of two), the concentration is halved assuming that the amount of solute remains constant.
To calculate the new concentration after dilution, one could use the equation C1V1 = C2V2, where C1 and V1 are the original concentration and volume respectively, and C2 and V2 are the concentration and volume of the diluted solution respectively. Since the volume is doubled, V2 = 2V1, thus the equation can be simplified to C1 = 2C2, leading to the new concentration C2 = C1/2.
The initial concentration of 0.10 M silver nitrate is diluted by a factor of two, resulting in a new concentration of 0.05 M.
In order to find the new concentration after dilution, you can use the dilution formula: C1V1 = C2V2Where C1 is the initial concentration (0.10 M), V1 is the initial volume, C2 is the final concentration, and V2 is the final volume. Because the solution is diluted by a factor of two, V2 is twice V1. Therefore, we can simplify the problem: C2 = C1 / 2
Substituting the given values:
C2 = 0.10 M / 2 = 0.05 M
So, the new concentration of the silver nitrate solution after dilution is 0.05 M.
How are greenhouse gases like carbon dioxide and methane different from other atmospheric gases like nitrogen and oxygen?