Answer:
2358
Explanation:
the whole answer is 2358.11
50 POINTS!!! GOOD AND EXPERT ANSWER ONLY!!! DONT WRITE FAKE ANSWERS FOR POINTS OTHERWISE THEY WILL BE DELETED!!!
The cathode ray experiment indicated the existence of negatively charged particles in an atom. This experiment also disproved the part of Dalton's atomic model that claimed indivisibility of the atom. When the experiment was repeated using cathodes made of a different metal, each time the results were consistent. These discoveries of Thompson were later substantiated by Robert Millikan when he calculated the charge on an electron.
Use information from the passage to justify whether the characteristics of reliable scientific explanations are present in the development of the atomic theory.
The characteristics of scientific explanation are included in the development of the atomic theory.
What is the scientific method?The development of a scientific idea always follows the scientific method. The scientific method includes the proposition of a hypothesis, the confirmation or disapproval of the initial hypothesis, and experimentation.
Dalton's primary ideas were laid aside as stronger empirical evidence developed. J.J. Thomson's experiment has given the atomic model while the nucleus and electron were discovered by the experiments of Rutherford, Geiger, and Ernest Marsden.
Since there was experimentation at certain points to confirm or disprove the propositions, therefore, there was a deep involvement of the scientific method in the development of the atomic theory.
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A 0.325g of KHP required 20.15ml of NaOH for neutralization. Calculate the molarity of NaOH
The molarity of NaOH solution that required 20.15mL is 0.0004032M.
How to calculate molarity?Molarity is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution.
Molarity of a solution can be calculated by dividing the number of moles in the solution by the volume as follows:
Molarity = no of moles ÷ volume
According to this question, 0.325g of KHP required 20.15ml of NaOH for neutralization. The number of moles in this mass can be calculated as follows:
no of moles = 0.325g ÷ 40g/mol
no of moles = 0.008125mol
Molarity = 0.008125mol ÷ 20.15mL
Molarity = 0.0004032M
Therefore, 0.0004032M is the molarity of the solution.
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how do i calculate the mass of the product of this equation : 2Fe+3Cl2-->2FeCl3, given that I have 5 grams of Chlorine
To calculate the mass of the product FeCl₃, we will need to do the following steps:
1 - Calculate the molar masses of Cl₂ and FeCl₃.
2 - Calculate the number of moles of Cl₂ in 5g of it.
3 - Calculate the number of moles of FeCl₃ given the stoichiometry of the reaction.
4 - Calculate the mass of FeCl₃ for the calculatd number of moles.
(we will use M for molar mass, m for mass and n for number of moles)
1 - The molar masses can be calculated using the molar masses of the elements in each compound:
[tex]\begin{gathered} M_{Cl_2}=2\cdot M_{Cl} \\ M_{Cl_2}=2\cdot35.453g\/mol \\ M_{Cl_2}=70.906g\/mol \end{gathered}[/tex][tex]\begin{gathered} M_{FeCl_3}=1\cdot M_{Fe}+3\cdot M_{Cl} \\ M_{FeCl_3}=(1\cdot55.845+3\cdot35.453)g\/mol \\ M_{FeCl_3}=162.204g\/mol \end{gathered}[/tex]2 - Now, we need to calculate the number of moles of Cl₂, so we will use the molar mass of Cl₂.
So, for the number of moles of Cl₂, we have:
[tex]\begin{gathered} M_{Cl_{2}}=\frac{m_{Cl_2}}{n_{Cl_{2}}} \\ n_{Cl_2}=\frac{m_{Cl_2}}{M_{Cl_{2}}}=\frac{5g}{70.906g\/mol}=0.070515\ldots mol \end{gathered}[/tex]3 - Now, we need to apply the stoichimetry. We can use rule of three for this.
From the balanced equation, we see that for each 3 Cl₂ that react, we will produce 2 FeCl₃.
So, we know that we actually have 0.070515...mol of Cl₂, so we use the rule of three to see how many moles we will produce of FeCl₃:
FeCl₃ --- Cl₂
2 --- 3
n --- 0.070515...mol
So, we have the equation:
[tex]\begin{gathered} \frac{2}{n}=\frac{3}{0.070515\ldots mol} \\ 2\cdot0.070515\ldots mol=3n \\ 0.141031\ldots mol=3n \\ 3n=0.141031\ldots mol \\ n=\frac{0.141031\ldots mol}{3} \\ n=0.047010\ldots mol \end{gathered}[/tex]And this is the number of moles of FeCl₃, so we can indicate this with the subscript:
[tex]n_{FeCl_3}=0.047010\ldots mol[/tex]4 - Finally, we will use now the molar mass of FeCl₃ to calculate the mass of 0.047010...mol of FeCl₃. The equation is the same as we used for Cl₂, but we will find the mass instead of the number of moles:
[tex]\begin{gathered} M_{FeCl_3}=\frac{m_{FeCl_3}}{n_{FeCl_{3}}} \\ m_{FeCl_3}=n_{FeCl_3}\cdot M_{FeCl_3}=0.041010\ldots mol\cdot162.204g\/mol=7.6253\ldots g \end{gathered}[/tex]So, the mass is 7.6253...g, but since we started with the mass of 5g, we have only one significant figure, so if we strickly consider the number of significant figures, we need to end up with only one, so:
[tex]m_{FeCl_3}\approx8g[/tex]So, the mass that we will produce if all the 5 grams react is 7.6253...g or, approximately 8g.
the relative density of lead is 11. Calculate it's density.
Under the given conditions, the density of lead is 11000 kg/m∧3.
What is relative density?
The proportion of a substance's density to that of reference material under particular circumstances is called relative density. The standard measure for liquids and solids is often water at 4°C or another predetermined temperature. An ice cube, for instance, has a relative density of 0.91 and will float. A substance will sink if its relative density is greater than 1. Both the reference and the sample must have a specific temperature and pressure.
Let the Relative density of lead be R
The density of water is ρw
We know,
Relative density R = 11
Density of water = 1000 kg/m∧3
Density of lead = 11 × ρwater = 11 × 1000 kg/m∧3 = 11000 kg/m∧3
Hence, the density of lead is 11000 kg/m∧3.
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Density of water, ρ
water
=1000 kg/m
3
=1 g/cm
3
⟹ρ
lead
=11.3×ρ
water
ρ
lead
(in g/cm
3
)=11.3×1
ρ
lead
(in g/cm
3
)=11.3 g/cm
3
And,
ρ
lead
(in kg/m
3
)=11.3×1000
ρ
lead
(in kg/m
3
)=11300 kg/m
3
If the specific heat of methanol is 2.44 J/k -g how many joules are necessary to raise the temperature of 40g of methanol from 50⁰c to 60⁰c?
Explanation:
[tex]q = mc(t2 - t1)[/tex]
[tex]q = 40 \times 2.44 \times (60 - 50)[/tex]
[tex]q = 976 \: joules[/tex]
can atoms of different elements have the same atomic number?
No, Atoms of different element can not have same atomic number because only same type of atoms combine to form element. Atoms belonging to different element can have different atomic number.
What is element?Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same. Two or more than two atoms with different physical or chemical properties can not combine together to form an element.
So we can say that atomic number of all atoms that is constituting an element is same. It can never be different.
Thus Atoms of different element can not have same atomic number.
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Is pollution parasitism or commensalism
The answer would be parasitism.
Let's define each term.
Parasitism: A relation between organisms in which one lives as a parasite on another.
Commensalism: A type of relationship between two species of plant, animal, fungus, etc., in which one lives with, on, or in another without damage to either.
Pollution: The introduction of harmful substances or products into the environment; the act of polluting or the state of being polluted.
Under some conditions, parasitism poses a major hazard to hosts, and environmental pollution has a detrimental impact on organism health as well. The concomitant effects of contaminants and parasites on an organism's physiological homeostasis are poorly understood. The current study indicates that parasites can: I affect how pollutants are metabolized by infected hosts; (ii) interact with pollution in positive or negative ways; and (iii) cause physiological changes in hosts that were previously assumed to be caused by pollution. Fish infected with acanthocephalans have lower metal levels than uninfected hosts, according to experimental studies on the uptake and accumulation of metals by fish. For instance, Pomphorhynchus laevis lowers lead levels in fish bile, which lessens or impedes the cycling of lead in the liver and intestines, potentially lowering the amount of metals available to fish. Thus, changes in pollutant absorption and accumulation caused by parasites in various intermediate and ultimate hosts are crucial to the study of ecotoxicology. Along with these changes, there is a strong relationship between the impacts of pollutants and parasites that appears to be partly mediated by the endocrine system, which is intimately linked to the immune system in fish. Studies in the lab on eels that had been artificially infected with the swimbladder worm Anguillicola crassus have shown that harmful substances like polychlorinated biphenyls have immunosuppressive effects that make parasite infection easier. Similar to this, a decrease in anti-A. crassus antibody levels is associated with an increase in blood cortisol concentration in eels as a result of chemical exposure and infection. Additionally, parasites are capable of inducing physiological modifications that are ascribed to substances with endocrine disrupting action, for instance, the cestode Ligula intestinalis is known to inhibit roach gonad growth. Roach are the best instances of endocrine disruption in wild fish, and it is likely that this disruption may be brought on by parasites like L. intestinalis or members of the phylum Microspora in addition to chemical action.
Thanks,
Eddie
Answer:
the answer is parasitism
C2H4O2 IS THE EMPIRICAL FORMULA FOR GLUCOSE?
The empirical formula of the glucose molecule is written as [tex]CH_{2} O[/tex].
What is the empirical formula for glucose?Let us recall that glucose is the molecule that is response for the quick release of energy in the body. It is also the molecule that is first formed in the process of photosynthesis.
The term carbohydrate actually means a compound that is a hydrate of carbon and it is composed of glucose molecules. The empirical formula shows the relationship or the ratio of the atoms that could be found in a compound. We can see that we can obtain the ratio from the number of each of the atoms present.
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The average college student uses 320 pounds of paper per year. How many
ounces of paper does an average college student use per day?
1 pound = 16 ounces 1 year= 365 days
*
Based on the conversion factor, the number of ounces of paper an average college student uses per day is 14 ounces of paper per day
What is the conversion factor from pounds to ounces?A conversion factor is a value that is used to make the conversion from one unit of measurement to another.
The conversion factor from pounds to ounces is given below as follows:
1 pound = 16 ounces
Also, the conversion factor from years to days is given below as follows:
1 year = 365 days
Hence, the ounces of paper an average college student uses per day are calculated as follows;
320 pounds = 320 * 16 ounces
320 pounds = 5120 ounces
Ounces of paper per day = 5120 / 365
Ounces of paper per day = 14 ounces per day
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At equilibrium, a reaction vessel contains 4.50 atm of Br₂ and 1.10 atm of NBr₃. According to the reaction: 2 NBr₃ (g) ⇌ N₂ (g) + 3 Br₂ (g) Kp = 4.8
Determine the equilibrium partial pressure of N₂.
Equilibrium constant is the only concept that is to be used here to calculate partial pressure of nitrogen. The partial pressure of Nitrogen comes out to be 1.17atm
What is equilibrium constant?Equilibrium constant is a rate constant at equilibrium shows the values of reaction with respect to the atmospheric pressure and concentration
[tex]K_{c}[/tex] is equilibrium constant with respect to concentration.
[tex]K_{p}[/tex] is equilibrium constant with respect to atmospheric pressure.
Mathematically,
[tex]K_{p}=\frac{[N_{2}][Br_{2} ] }{[NBr_{3}] }[/tex]
Substituting values
(4.8×1.10atm)÷ 4.50atm=[tex]{[N_{2}][/tex]
1.17atm=[tex]{[N_{2}][/tex]
Thus the equilibrium partial pressure of N₂ is 1.17atm.
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on a solid mixture, X. The inferences made are recorded in Table 2. Complete Table 2 by filling in the observations based on the inferences made. TABLE 2: TESTS ON MIXTURE X Test Observation Inferences a) Distilled water was added to a portion of X and the resulting mixture stirred and filtered. (The residue was set aside for use later.) The filtrate was divided into 3 equal portions and tests (b) to (d) done on separate portions. Cl- ions are present. b) Dilute nitric acid followed by a few drops of silver nitrate solution was added. Ammonium hydroxide solution was added to the resulting mixture. (3 marks)
Answer:
a) Upon adding silver nitrate, a white precipitate is observed
b) Upon adding ammonium hydroxide, the white precipitate dissolves to give a clear, colorless solution
Explanation:
Here, we want to state the observations when testing for chloride ions
From what we have:
a) When silver nitrate is added, a white precipitate is formed
This is as a result of the following chemical reaction:
[tex]Ag\placeholder{⬚}_{(aq)}^+\text{ + Cl}_{(aq)}^-\text{ }\rightarrow\text{ AgCl}_{(s)}[/tex]The AgCl is the white precipitate formed
b) Upon the addition of the ammonium hydroxide solution, a colorless and clear solution is observed showing that the white precipitate has dissolved
What is the oxidation number or Br in NaBrO?
Can I know the answer ？
According to the given statement Mass of one atom of gold in grams is 196.78 g.
What is a atom ?A chemical element is uniquely defined by its atoms, that are small bits of substance. An atom is made up of a core nucleus one and or more negatively charged electrons that orbit it. The positively charged, relatively hefty protons and neutrons that make it up the nucleus may be present.
Who discovered the atom?Up until the 1800s, this idea of tiny, indivisible pieces of matter remained. The contemporary atomic idea was really started by the eminent chemist John Dalton (1766–1844). But his atom was like a rock-solid ball.
Briefing:Molar mass is the weight in grams of one mole of an atom.
1 mole = 6.022×10²³ atoms
Molar mass of Gold (Au)
= mass of an atom × number of atoms
=3.207×10-²²×6.022×10²³
=196.78g.
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What is the volume, in mL, of a solution that is 0.421 M K2SO3 and was prepared by dissolving 16.7 g of solid potassium sulfite in water?
How many possible combinations are there for the values of l and ml when n = 3?
There are three possible values for the l and there are nine possible values for ml.
What are quantum numbers?The term quantum numbers has to do with the description that shows the most probable position of the electron in an atom. We know that the orbital is a region in space, where there is a high probability of finding the electrons.
Given that the values of l must be in the range of 0 to n - l and the values of ml must be in the rang of -l to + l. we then can use this to know the number of the possible combinations of l and ml when n = 3.
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I NEED HELP! WILL MARK BRAINLIEST!
Isotopes of certain ___ elements that spontaneously emit ___ and ___ from the ____.
Isotopes of certain radioactive elements that spontaneously emit radiation and rays from the nuclei.
How do isotopes form?Isotopes can be artificially created by bombarding a stable nucleus with charged particles using accelerators or nucleons in a nuclear reactor, or they can be created normally through the nuclear reactions of a nucleus (i.e., emission of energy in the form of of alpha particles, beta particles, neutrons, and photons).
Who discovered isotopes?Soddy at the Glasgow University at his lab. The idea of isotopes—that elements could have more least 1 atomic weight—was first forth by English radiochemist Frederick Soddy in a public letter that appeared in the Dec. 4, 1913, issue of Nature. His formula won him the 1921 Nobel Prize in Chemistry.
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An instantaneous dipole occurs when a molecule's moving electrons are briefly more concentrated in one place than another, causing the molecule to become temporarily polarized.
True
False
An instantaneous dipole occurs when a molecule's moving electrons are briefly more concentrated in one place than another, causing the molecule to become temporarily polarized.
The correct option is True.
What are dipoles?Dipoles refer to a separation of charges where one end of a substance has a positive charge while the other end has a negative charge.
In chemical compounds, dipoles occur within a molecule that has covalently bonded atoms or atoms that share electrons in the covalent bond.
The dipole may be permanent dipoles or temporary dipoles.
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based on research, would you consider natural gas a clean source of energy?
Answer:
Explanation:
Here, we want to consider if natural gas is a clean energy source
A clean energy source is one with zero environmental pollution effects
At present, it is quite impossible for natural gas plant not not release heat-trapping gases into the atmosphere. Although this can be largely reduced as we can see in new generation plants. However,this does not move us from the point that natural gas is itself not a clean energy source due to its by-product from usage.
Hence, our answer here is NO, natural gas is not a clean source of energy
Which is an example of plasmas in nature?
Answer: nbhhvyyvub
Explanation:
Convert 0.05090Kg/mol to dg/mmol
Answer: .509
Explanation: Im pretty sure
A 300K gas at 1.5 atm is pressurized to 2.25 atm. What is its resulting temperature in K?
Step 1 - Understanding the relation between temperature and pressure
There are three main variables that can modify the state of a gas: pressure (P), volume (V) and temperature (T). When one of them is kept constant, linear relationships arise between the remaining two.
So when we keep the volume constant (isovolumetric transformation), the pressure and the temperature become directly proportional, i.e., the greater the temperature, the greater the pressure and vice-versa.
We can state it mathematically as:
[tex]\frac{P_1}{T_1}=\frac{P_2}{T_2}[/tex]Step 2 - Using the equation to solve the question
how many moles of HCL are required to prepare 0.80L of a 0.5M HCL solution
Answer:
[tex]0.4\text{ mol}[/tex]Explanation:
Here, we want to get the number of moles
Mathematically:
[tex]Number\text{ of moles = molarity }\times\text{ volume}[/tex]We have that as:
[tex]Number\text{ of moles = 0.5 }\times\text{ 0.8 = 0.4 mol}[/tex]You have 0.834 moles of Potassium. The NIH recommends 2,600mg of potassium as a daily intake recommendation. Convert the moles to mg.
Answer:
0.834 mole = 13293.32 mg
2,600 mg = 0.16 mole
Explanation:
1 mole of K = 39.098 g
=> 0.34 mole has (0.34)(39.098) = 13.29332g
13.29332 g x 10^3 = 13293.32 mg
so 0.834 mole of K = 13293.32 mg
mole of 2,600mg = (0.834)(2,600)/(13293.32) = 0.16311952168 or 0.16 mole
How does temperature of land far from water compare to that of land near water?
The temperature of land far from water is hotter than land near water.
The temperature of land far from water is less stable compared to land near water.
The temperature is similar for land both near and far from water.
The temperature is either too hot or too cold near water.
The temperature of land far from water is hotter than land near water.
Why the temperature of land far away from water different from land near water?The lower heat capacity of land often allows them to cool the nearby water temperature so it takes less energy to change the temperature of land compared to water bodies. This means that land heats and cools more quickly as compared to water. This difference affects the climate of different areas on Earth. Large bodies of water like oceans, seas and large lakes can affect the climate of the nearby regions such as coastal regions. Water heats and cools more slowly than land regions. The coastal regions will stay cooler in summer season and warmer in winter season, which creates moderate climate on the coastal regions.
So we can conclude that the temperature of land far from water is different from land near water because of cooling effect of water bodies.
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Below is the word equation for the reaction between sodium hydroxide and hydrochloric acid. Identify the reactant(s) in the reaction. Sodium hydroxide + Hydrochloric acid → Sodium chloride + Water
I a chemical reaction, we have the reactants in the left part,followed by an arrow and then the products.
So, the reactants are the two that are in the left part of the equation:
Sodium hydroxide and Hydrochloric acid
How many grams of Br are in 395 g CaBr2 ?
In order to answer this question we will need to use the molar mass of Calcium bromide (CaBr2), which is 199.89 g/mol, now we can find how much of this mass is only Bromide, so what is the percentage of Bromide that makes up this whole compound, to do so we will also use the molar mass of Bromide (Br2) which is 159.8 g/mol
199.89 g/mol = 100% of the compound
159.8 g/mol = x %
x = roughly 80% (is like 79.9%)
So, regardless of the mass of CaBr2, bromide needs to be 80% of its mass, now solving our question
395 g = 100%
x grams = 80%
x = 316 grams is the mass of Bromide in the compound
Ammonium nitrate (NH4NO3), a common fertilizer, is 35.0% nitrogen by mass. How much ammonium nitrate contains 1.25 kg of nitrogen?
The amount of ammonium nitrate contains 1.25 kg of nitrogen is 3571.42 gm
Percent composition tells you with the aid of mass what percent of each detail is found in a compound. A chemical compound is a mixture of or greater factors. in case you are analyzing a chemical compound, you may want to find the percentage composition of a sure detail within that chemical compound.
The percentage composition is the percentage through the mass of each detail in a compound.
The molar mass of ammonium nitrate (NH₄NO₃) = 14 + 4 + 14 + 48 = 80 g.
percentage composition of Nitrogen = 35%
Percentage composition of Hydrogen = 5%
Percentage composition of Oxygen = 60%
35% of 80 g ammonium nitrate (NH₄NO₃) = 80 × 35/100
= 28 g.
∵ 28 grams of nitrogen contained in = 80 grams of ammonium nitrate (NH₄NO₃)
1250 g of nitrogen contained in = (80/28) × 1250 grams of ammonium nitrate (NH₄NO₃)
= 3571.42 g of ammonium nitrate (NH₄NO₃)
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Explain how you would calculate the total change in bond energy for the reaction H2+Cl2->2HCI. How would you know if the reaction was endothermic or exothermic?
To calculate the total change in binding energy we must apply the following equation:
[tex]\Delta H=\Delta H_{f(\text{Reagents)}}-=\Delta H_{f(\text{Products)}}[/tex]This equation tells us that the energy change will be equal to the sum of the potential energy of the product bonds minus the sum of the potential energy of the reagent bonds.
Now, let's calculate each term separately.
[tex]\begin{gathered} \Delta H_{f(\text{Reagents)}}=n_{H2}\times\text{Energy bond H-H + }n_{Cl2}\text{Energy bond Cl-Cl} \\ \Delta H_{f(\text{Reagents)}}=1molH_2\times432\frac{kJ}{mol}+1molCl_2\times239\frac{kJ}{mol} \\ \Delta H_{f(\text{Reagents)}}=671kJ \end{gathered}[/tex][tex]\begin{gathered} \Delta H_{f(\text{Products)}}=n_{\text{HCl}}\times EnergyBond\text{ H-Cl} \\ \Delta H_{f(\text{Products)}}=2molHCl\times427\frac{kJ}{mol} \\ \Delta H_{f(\text{Products)}}=854kJ \end{gathered}[/tex]So, the change in bond energy will be:
[tex]\begin{gathered} \Delta H=\Delta H_{f(\text{Reagents)}}-=\Delta H_{f(\text{Products)}} \\ \Delta H=671kJ-854kJ=-183kJ \end{gathered}[/tex]We have a negative value in the result, when this happens it means that the reaction is exothermic, that is to say, that it releases heat and the energy of the products is greater than that of the reagents.
When we have a positive value the reaction will be endothermic, this means that it needs energy.
In the following equation, how many grams of O2 are needed to react with 24.0 g of NH3?
4 NH3(g)+302(g) → 2N2(g)+6H₂O(1)
a) 45.1
b) 22.6
c) 33.9
d) 45.0
e) 135.5
33.6 g grams of O2 are needed to react with 24.0 g of NH3.
The molecular mass of NH3 = 14 + 3 = 17g
Given mass of NH3 = 24g
Firstly, we will calculate the number of moles.
Moles is defined as the ratio of given mass of substance to the molecular mass of substance.
Moles = given mass/ molecular mass
Number of moles of NH3 = 24/17
= 1.4 mole
Chemical reaction4 NH3(g)+302(g) → 2N2(g)+6H₂O(1)
4 moles of NH3 require 3 moles of O₂ to react.
1 moles of NH3 require 3/4 moles of O₂ to react.
1.4 moles of NH3 require 1.05 moles of O₂ to react.
Now we calculate the grams of O₂.
1.05 × 32 = 33.6 g.
Thus, we concluded that the 33.6 g grams of O2 are needed to react with 24.0 g of NH3.
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What is made of two or more substances that are together in the same place but are not chemically combined
When two or more substances are together in the same place but are not chemically combined they form a mixture.
What is a mixture?The word mixture is used in chemistry to denote a combination of two or more elements that conserve their original properties, which is fundamental to achieving the separation of such elements in the future.
Therefore, with this data, we can see that a mixture is a mix or combination of two or more elements that still conserve their physical and chemical properties, thereby allowing their separation through different techniques.
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