Answer:
The first answer
Explanation:
Why? Because i got it right on my test.
I didn't copy of the other persons answer.
Lead has more valence electrons than carbon.
A- True
B- False
The statement "Lead has more valence electrons than carbon" is absolutely false.
What are Valence electrons?Valence electrons may be defined as the number of electrons that are present in the outermost shell of any atom. These electrons actively take part in the formation of chemical bonds.
For example, Sodium has atomic number 11. Its electronic configuration is 2, 8, 1. One electron is significantly present in the outermost shell, so the number of valence electrons in a sodium atom is 1.
Lead is an element that belongs to group number 4A. Though it is a member of group 4A, it has four valence electrons. Carbon has an atomic number of 6, its electrons are distributed like 2 electrons in K-shell and 4 electrons in the L-shell. L-shell is an outermost shell. Therefore, carbon also possesses the number of valence electrons four.
Therefore, the statement "Lead has more valence electrons than carbon" is absolutely false.
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Ionic bonds, such as in sodium chloride, __________.
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:
If 5.10 g of acetic acid is reacted, how many grams of water can form?
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.
How many more valence electrons does oxygen need to have a full outer valence shell?
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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How many oxygen atoms are there in 6.00 g of sodium dichromate, na2cr2o7?
Final answer:
approximately 9.69 × 10^23 oxygen atoms in 6.00 g of sodium dichromate.
Explanation:
to calculate the number of moles of Na2Cr2O7 in 6.00 g and then use this information to find the number of oxygen atoms. First, calculate the molar mass of Na2Cr2O7. Sodium (Na) has an atomic mass of about 23.0 g/mol, chromium (Cr) is roughly 52.0 g/mol, and oxygen (O) is 16.0 g/mol. Therefore, the molar mass of Na2Cr2O7 is (2×23.0) + (2×52.0) + (7×16.0) = 262.0 g/mol. To find the moles of Na2Cr2O7 in 6.00 g, use the formula: Moles = mass (g) / molar mass (g/mol), which gives us 6.00 g / 262.0 g/mol = 0.0229 mol.
Since Na2Cr2O7 contains 7 oxygen atoms per formula unit, the total number of oxygen atoms in 6.00 g of Na2Cr2O7 is 0.0229 mol × (7 atoms/mol) × (6.022 × 1023 atoms/mol) = 9.69 × 1023 oxygen atoms.
The following reaction is balanced, True or False? P4 + 2 O2 → 2 P2O3 True False
Your mass on the moon would be __________________________________ it is on the earth.
greater than
less than
the same as
it would remain the same as
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:
for acidic solutions, which element is added to balance half-reactions
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?
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 many moles of H2So4 are in 2.50 L of 4.25 M aqueous solution?
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.
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.
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.
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.
In the reaction below, hydrogen peroxide decomposes to water. MM H2O2 = 34.02 g/mol MM H2O = 18.02 g/mol MM O2 = 32 g/mol 2H2O2 → 2H2O + O2 If 14.3 moles of H2O2 is decomposed, how many grams of oxygen gas are produced? Show ALL your work to get full credit.
How are greenhouse gases like carbon dioxide and methane different from other atmospheric gases like nitrogen and oxygen?
In 2015, a panel found that labeling the country of origin on meat products gives an unfair advantage to products made in the United States over those coming from another country. This panel was probably from which of the following?
A. The Convention on International Trade in Endangered Species
B. The Convention on Biological Diversity
C. The Ramsar Convention
D. The World Trade Organization
Answer:
D. The World Trade Organization
Explanation:
The purpose of the World Trade Organization is to establish a common institutional framework to regulate trade relations between its various Members, to establish a mechanism for the peaceful settlement of trade disputes on the basis of the trade agreements currently in force and to create an environment negotiation of new trade agreements between Members.
Thus, we can conclude that if a country is producing packaging of a commercial product that is taking advantage of the product of other countries, this should be discussed at a meeting of the World Trade Organization.
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.
Write a chemical equation that illustrates the autoionization of water -g.com
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
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
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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Explain, in detail, how you convert grams of one substance to grams of something else. Be specific and include each step.
Explanation:
First, I will assume you are asking the procedure to get mass of a substance, after we initiate a chemical reaction. If this is the case, then, let's explain it with an example:
Let's suppose we have the following reaction:
Zn + 2HCl -------> ZnCl₂ + H₂
And we part with 4.55 g of Zinc (Zn). We want to know the mass produced of ZnCl₂.
This is a simple reaction, where we only do conservation of mass. So, to get the mass of ZnCl2, we need to begin with the Zinc first, because we start with that given mass.
the mass of Zinc is 4.55 g. Chemicals reactions are better worked in moles rather than mass, because coefficients in the chemical reaction are in moles. So, in the case of the reaction (Which is already balanced):
Zn + 2HCl -------> ZnCl₂ + H₂
The number 2 that it's behind the HCl represents the theorical moles of that substance, in this case, we need 2 moles of HCl to react with only 1 mole of Zinc. It's 1 mole of Zinc because there are no numbers there, so, we always assume there's a 1 in there.
Now that we know this, let's calculate the moles of Zinc. To do that, we need the molar mass of Zinc. This can be obtained in the exercise or look the periodic table, and search for the Zinc. In this case, the molar mass of Zinc is 65.38 g/mol. So to get the moles:
n = m/MM
Replacing the data:
n = 4.55 g / 65.38 g/mol = 0.0695 moles
These are the moles of Zn reacting in the chemical reaction. Now, we should do some stechiometry. In this case, we can see that, 1 mole of zinc (In the reaction) produces 1 mole of ZnCl2, therefore the moles of Zn obtained, will be the same moles produced of ZnCl2, thus:
moles ZnCl2 = moles Zn = 0.0695 moles
Finally, with the molar mass of ZnCl2, we can calculate the mass. the molar mass of ZnCl2 is 132.29 g/mol so:
m = n * MM
Replacing:
m = 0.0695 * 132.29
m = 9.19 g of ZnCl2
And this is the simple way to obtain the mass of a substance in a reaction
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.
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.