Can someone please help me this is Chemistry 1 and I need to know how they got this answer like working out the problems step by step to write on my paper to show that I showed my work.
Answers
The energy of the X-ray, given that it has a wavelength of 3.80×10⁻⁶ cm is 5.23×10⁻¹⁸ J (Last option)
How do I determine the energy of the X-ray?We'll begin by obtaining the frequency of the X-ray. Details below:
Wavelength (λ) = 3.80×10⁻⁶ cm = 3.80×10⁻⁶ / 10² = 3.80×10⁻⁸ mSpeed of x-ray (v) = 3×10⁸ m/sFrequency (f) =?Velocity (v) = wavelength (λ) × frequency (f)
3×10⁸ = 3.80×10⁻⁸ × frequency
Divide both sides by 3.80×10⁻⁸
Frequency = 3×10⁸ / 3.80×10⁻⁸
Frequency = 7.89×10¹⁵ Hertz
Finally, we shall determine the energy of the X-ray. Details below:
Frequency (f) = 7.89×10¹⁵ HertzPlanck's constant (h) = 6.626×10⁻³⁴ JsEnergy of x-ray (E) = ?Energy (E) = Planck's constant (h) × frequency (f)
E = hf
E = 6.626×10⁻³⁴ × 7.89×10¹⁵
E = 5.23×10⁻¹⁸ J
Thus, the energy is 5.23×10⁻¹⁸ J (Last option)
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Related Questions
a sample of an unknown compound gas contains 34g of that gas occupies 6.7l at 2 atm and has a temp of 182.5k what is the molecular weight and what gas do you believe it to be?
Answers
The molecular weight of the sample of unknown gas that occupies 6.7L at 2 atm and has a temperature of 182.5K is 38.02g/mol.
How to calculate molecular weight?The molecular weight or mass of a substance can be calculated from the number of moles in the substance. However, the number of moles of the substance can be calculated using Avogadro's equation as follows:
PV = nRT
Where;
P = pressureV = volume n = number of molesT = temperatureR = gas law constant2 × 6.7 = n × 0.0821 × 182.5
13.4 = 14.98n
n = 0.894 moles
molecular weight = 34g ÷ 0.894mol = 38.02g/mol
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what product of an acid base reaction is an iconic compound
Answers
Answer: NaCl
Explanation: salt
The product of an acid-base reaction in an iconic compound is Salt and water.
A neutralization reaction is a reaction in which an acid and a base react in an aqueous solution to produce salt and water.
When a strong acid and a strong base are mixed, they react according to the following net-ionic equation:
H₃O⁺(aq) + OH⁻(aq) → 2H₂O(l).
An acid-base reaction is a type of reaction that is also known as a neutralization reaction. The reaction between NaOH and HCL to form salt and water is represented by the chemical equation:
HCL(aq) + NaOH(aq) → NaCl(aq) + H2O(I)
HCl is the acid that reacts with NaOH which is the base. The product formed from an acid-base reaction is known as salt. The salt formed from the sample reaction is NaCl.
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A student runs the reaction represented by the equation below. What mass of H2 gas would be produced if the student begins with 9.68 grams of each reactant? Round to the nearest 0.01 and remember to include both units and substance in your answer!!!
Zn + HCl --> ZnCl2 + H2
Answers
Answer:
The balanced equation for the reaction is:
Zn + 2HCl -> ZnCl2 + H2
Since the student starts with 9.68 grams of each reactant, we have 9.68 grams of Zn and 9.68 grams of HCl.
From the balanced equation, we know that 2 moles of HCl are needed to produce 1 mole of H2. Thus, if we have 9.68 grams of HCl, we have:
9.68 g / (36.5 g/mol) = 0.265 moles of HCl
Therefore, we can calculate the number of moles of H2 that would be produced:
0.265 moles H2 = 0.265 moles HCl x (1 mole H2 / 2 moles HCl) = 0.132 moles of H2
Next, we can convert the number of moles of H2 to mass:
0.132 moles H2 x (2.02 g/mol) = 0.267 g of H2
Therefore, 9.68 grams of each reactant would produce approximately 0.267 g of H2.
So the answer is 0.267 g of H2.
what is the product when acetone is reacted with methylmagensium chloride, followed by aqueous workup?
Answers
A typical Grignard reaction is the interaction between acetone and methyl magnesium chloride (MeMgCl). A Grignard reagent (in this example, MeMgCl) is added to the carbonyl group of acetone in this reaction, following which the product is extracted through an aqueous workup.
Here's how the overall response can be communicated: MeMgCl + CH3COCH3 CH3CHOHCH3MgCl In this reaction, the carbonyl carbon of the acetone reacts with the methyl group of the MeMgCl reagent to generate an intermediate alkoxide. In the presence of aqueous acid, this intermediate is eventually oxidized to generate the final product, 2-propanol (also known as isopropyl alcohol), and magnesium chloride:
CH3CHOHCH3OH + MgCl2 = CH3CHOHCH3MgCl + H2O Hence, 2-propanol and magnesium chloride are the final products of the reaction between acetone and MeMgCl, followed by an aqueous workup.
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true or false? as you go left to the right across the periodic table, atoms get more and more protons and electrons, therefore the radius gets larger. explain your answer.
Answers
False. As you go from left to right across the periodic table, the number of protons and electrons in the atoms increases, but the atomic radius decreases.
This is due to the increasing nuclear charge (number of protons in the nucleus) that attracts the electrons more strongly, pulling them closer to the nucleus and reducing the size of the atom. This effect is only partially offset by the addition of more electrons in higher energy levels, as these are further away from the nucleus and have less influence on the overall size of the atom. Protons and electrons are subatomic particles that make up atoms. Protons are positively charged particles found in the nucleus of an atom, while electrons are negatively charged particles that orbit the nucleus in shells or energy levels.
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Each of the following properties as being physical as being physical or chemical iron rusting gasoline burning solid sulfur shaltering and lye feeling slippery
Answers
Properties of Iron Rusting is Chemical;Gasoline Burning is Chemical;Solid Sulfur is Physical ;Shattering is Physical ;Lye Feeling Slippery is Physical.
Iron Rusting: Chemical - Iron rusting is a chemical reaction between iron, oxygen and water which results in the formation of hydrated iron oxide (Fe2O3).
Gasoline Burning: Chemical - Gasoline burning is a combustion reaction between gasoline and oxygen which results in the formation of carbon dioxide (CO2) and water (H2O).
Solid Sulfur: Physical - Solid sulfur is a physical property because it is a solid at room temperature and pressure.
Shattering: Physical - Shattering is a physical properties because it is a change in the physical structure of an object.
Lye Feeling Slippery: Physical - Lye feeling slippery is a physical property because it is a tactile sensation caused by the physical properties of lye.
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Complete question:Each of the following properties as being physical as being physical or chemical
iron rusting; gasoline burning ;solid sulfur ;shaltering and lye feeling slippery
what materials can easily diffuse through the lipid bilayer, and why?
Answers
Small nonpolar molecules, including O2 and CO2, are soluble withinside the lipid bilayer and consequently can effortlessly pass cellular membranes.
Small uncharged polar molecules, including H2O, can also diffuse via membranes, however large uncharged polar molecules, including glucose, cannot. Only the smallest molecules like water, carbon dioxide, and oxygen can freely diffuse throughout mobileular membranes. The shape of the lipid bilayer permits small, uncharged materials including oxygen and carbon dioxide, and hydrophobic molecules including lipids, to byskip via the mobileular membrane, down their awareness gradient, with the aid of using easy diffusion. The molecules that diffuse via the plasma membrane maximum quick are small, hydrophobic molecules including oxygen or carbon dioxide.
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In the ionic compounds LiF, NaCl, KBr, and RbI, the measured cation–anion distances are 2.01 Å (Li–F), 2.82 Å (Na-Cl), 3.30 Å (K–Br), and 3.67 Å (Rb–I), respectively.
1. Predict the cation–anion distance using the values of ionic radii given in Figure 7.7, on page 257 in the textbook.
2. Calculate the difference between the experimentally measured ion–ion distances and the ones predicted from Figure 7.7. Assuming we have an accuracy of 0.04 Å in the measurement, would you say that the two sets of ion–ion distances are the same or not? Why, or why not?
3. What estimates of the cation–anion distance would you obtain for these four compounds using bonding atomic radii? Are these estimates as accurate as the estimates using ionic radii? Explain your answer.
Please explain the part on the 4% accuracy.
Answers
The predicated cation anion distance for LiF, NaCL, KBr, RbI is 2.09Å, 2.83 Å, 3.34 Å, 3.72 Å respectively. The difference between the experimentally measured ion–ion distances and the ones predicted are 0.08 Å, 0.01 Å, 0.04 Å, 0.05 Å
The cation anion distance using the values of iconic radii are as follows:
i) LiF
the ionic radii of cation, Li⁺ = 0.90 Å
the ionic radii of anion, F⁻ = 1.19 Å
the predicated cation anion distance = 0.90Å + 1.19Å = 2.09Å,
ii) NaCl
the ionic radii of cation, Na⁺ = 1.16 Å
the ionic radii of anion, Cl⁻ = 1.67Å
the predicated cation anion distance = 1.16 Å + 1.67 Å = 2.83 Å,
iii) KBr
the ionic radii of cation, K⁺ = 1.52 Å
the ionic radii of anion, Br⁻ = 1.82 Å
the predicated cation anion distance = 1.52 Å + 1.82 Å = 3.34 Å,
iv) RbI
the ionic radii of cation, Rb⁺ = 1.66 Å
the ionic radii of anion, I⁻ = 2.06 Å
the predicated cation anion distance = 1.66 Å + 2.06 Å = 3.72 Å,
i)LiF:
Experimentally measured cation-anion distance = 2.01 Å,
predicted cation anion (LiF) distance = 2.09 Å
the difference = 2.09 Å - 2.01 Å = 0.08 Å
ii)NaCl
Experimentally measured cation-anion distance = 2.82 Å,
predicted cation anion (NaCL) distance = 2.83 Å
the difference = 2.83 Å - 2.82 Å = 0.01 Å
iii)KBr
Experimentally measured cation-anion distance = 3.30 Å,
predicted cation anion (KBr) distance = 3.34 Å
the difference = 3.34 Å - 3.30 Å = 0.04 Å
iv) RbI
Experimentally measured cation-anion distance = 3.67 Å,
predicted cation anion (RbI) distance = 3.72 Å
the difference = 3.72 Å - 3.67 Å = 0.05 Å
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What’s the answers to this quiz?
Answers
Antimony is an element having atomic number 51 and mass number 121.76 u. It has 51 number of proton and electrons.
Phosphorus is an element having the atomic number 15. It has 15 protons, electrons, and 16 neutrons.
The symbol of magnesium is Mg whereas the symbol of cobalt in Co.
The two subatomic particles present in the nucleus are the proton and neutron. They are collectively called nucleons. The proton has a positive charge, the electron has a negative charge whereas the neutron has no charge.
Where are protons neutrons and electrons?Protons and neutrons are accordingly called nucleons since they are in the nucleus of the atom. electrons are a type of subatomic speck with a negative charge. Protons are a type of subatomic particle with a positive charge.
Neutrons, further with protons, are subatomic particles found inside the nucleus of every atom. Neutrons have an impartial electric charge (neither negative nor positive) and have rather more mass than positively charged protons.
So we can conclude that Unlike protons and neutrons, which are detected inside the nucleus at the center of the atom, electrons are initiated outside the nucleus.
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Iron has a density of 7. 86 g/cm3 (1 cm3=1 mL). Calculate the volume (in dL) of a piece of iron having a mass of 4. 18 kg. Note that the density is provided in different units of volume and mass than the desired units of volume (dL) and the given units of mass (kg). You will need to express the density in kg/dL (1 cm3 = 1 mL) before calculating the volume for the piece of iron
Answers
510.17 centimetres cube is the volume of iron has a density of 7.86 gram per centimetres cube ( 1 centimetre cube = 1ml) and has a mass of 4.01 kg.
Density is the amount of mass of a substance present per volume of the cubic centimetre and it is the ratio of mass of a substance to the volume of the substance with a unit centimetre cube.
The iron has a density of 7.86 gram per centimetres cube and mass of 4.01 kg so,
mass in grams= [tex]\frac{4.01}{1000} = 0.0041g.\\Density= \frac{mass}{volume}[/tex]
Substituting the values in the equation, we get:-
volume= [tex]\frac{0.0041}{7.86} = 510.17 cm^{3} .[/tex]
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write the balanced net ionic equation for the reaction when aqueous calcium chloride and aqueous lead(ii) nitrate are mixed in solution to form aqueous calcium nitrate and solid lead(ii) chloride. be sure to include the proper phases for all species within the reaction.
Answers
The reaction between aqueous calcium chloride and aqueous lead(II) nitrate, which results in the formation of aqueous calcium nitrate and solid lead(II) chloride, has the following balanced net ionic equation: PbCl2(s) + Ca(NO3)2 Pb(NO3)2(aq) + CaCl2(aq) (aq).
A chemical equation known as a balanced net ionic equation only displays the species and ions that are actively participating in a reaction, leaving out any spectator ions. The spectator ions that appear on both the reactant and product sides of the chemical equation are cancelled out to produce the net ionic equation. To highlight the primary chemical process taking place and to make the equation simpler to understand and evaluate, a balanced net ionic equation is used. This can be very helpful when figuring out how a response works and forecasting how it will turn out.
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a sample of trifluoroacetic acid, c2hf3o2, contains 88.9 88.9 g of oxygen. calculate the mass of the trifluoroacetic acid sample.
Answers
a sample of trifluoroacetic acid, c2hf3o2, contains 88.9 88.9 g of oxygen, the mass of the trifluoroacetic acid sample is: 316.484 grams
What is molar mass?The mass in grams of one mole of a chemical is its molar mass. A mole is the measurement of the number of things, such as atoms, molecules, and ions, that are present in a material. It provides you with the amount of grams per mole of a substance, to put it another way. The molar mass of a material is a bulk attribute rather than a molecular one. The fundamental units of matter are called atoms, and by joining atoms together, molecules are created. Chemists use the term "mole" because atoms, molecules, and other particles are all very tiny and require a large amount to even weigh them.
As we know,
1 mole of C₂HF₃O₂ contains 2 moles of oxygen
molar mass of C₂HF₃O₂ = 114.0 gm
atomic mass of 2 Oxygen = 32 gm
(114 / 32) = 3.56
grams of C₂HF₃O₂ = 88.9 x 3.56 = 316.484 grams
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Ozone is a secondary pollutant. a secondary pollutant is:________
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Ozone is a secondary pollutant, a secondary pollutant is a type of air pollutant that is produced as a result of chemical reactions between primary pollutants in the atmosphere.
Unlike primary pollutants, which are directly emitted into the atmosphere, secondary pollutants are formed through a series of chemical reactions between primary pollutants and other atmospheric compounds. Ozone is a secondary pollutant that is formed when primary pollutants such as nitrogen oxides (NOx) and volatile organic compounds (VOCs) react with each other in the presence of sunlight. Ozone is considered to be a secondary pollutant because it is not directly emitted into the atmosphere but instead is formed through chemical reactions involving primary pollutants. It's important to note that although secondary pollutants are not directly emitted into the atmosphere, they can still have significant impacts on the environment and human health. Ozone, for example, is a major component of smog and can cause respiratory problems, as well as damage crops and other vegetation.
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a solution is prepared with 3.85 grams of a non ionic unkwon compound in 100.0g cyclohexane. the solution had a freezing point of 4.18c. what is the molar mass
Answers
3.85 grammes of a non-ionic unidentified substance are dissolved in 100.0 grammes of cyclohexane to create a solution. The solution's freezing point was 4.18 c. The molar mass is 186.
Kf of cyclohexane = 20.2 C0/m
ΔTf =i* kf * m
i= 1 for non-electrolyte
4.18 = 1*20.2*m
m = 4.18/20.2 = 0.207m
molality = W*1000/G.M.Wt* weight of solvent
0.207 = 3.85*1000/G.M.Wt*100
G.M.Wt = 3.85*1000/0.207*100 = 186g/mole
the molar mass of the unknown compound is 186
A substance's molar mass is its mass in grammes per mole of the chemical. A mole is 6.022 1023 molecules of any given chemical. A mole is a unit used to quantitatively quantify the size of the tiniest entities, much like how we use a standard number to compute many things, such as how a dozen equals twelve objects.
Everybody is interested in learning how many molecules are there in a given substance. In terms of size and mass, molecules and atoms are incredibly small. The weight of one sample mole is known as the molar mass. The molar mass is determined by adding the atomic masses (atomic weights) of each atom in the molecule.
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How is an unknown oxidation state of an element within a compound
determined?
Answers
By taking a sum of the oxidation numbers and equating it to zero, the oxidation number of the unknown element can be determined.
What is the oxidation number?We know that the oxidation state of an unknown element can be found in a compound can be determined when we know that the sum of all the oxidation numbers of the elements in the compound is zero.
If we know the oxidation number of the other elements in the compound then we can call the unknown oxidation number x. By taking a sum of the oxidation numbers and equating it to zero, the oxidation number of the unknown element can be determined.
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Stoichiometry
2. Balance the equation
Name:
1. Given this equation: N₂ +_______ H₂ →NH,, balance it and write the following molar ratios:
a)
N₂/H₂
b)
Ng/NH,
c) Hạ / NH,
a) Li,N/H,O
b)
Answers
N₂ + 3H₂ →2NH[tex]_3[/tex] is the balanced equation. A balanced equation is indeed a chemical reaction equation.
What is balanced equation?A balanced equation is indeed a chemical reaction equation in which the overall charge and the amount of atoms for every element inside the reaction are the same for both the products and reactants.
In plenty of other terms, the mass as well as charge across both endpoints of the reaction are balanced.
N₂ + H₂ →NH[tex]_3[/tex]
Number of atom of nitrogen on reactant side is 2 while on product side it is 1.
N₂ + H₂ →2NH[tex]_3[/tex]
Number of atom of hydrogen on reactant side is 2 while on product side it is 6.
N₂ + 3H₂ →2NH[tex]_3[/tex]
Therefore, N₂ + 3H₂ →2NH[tex]_3[/tex] is the balanced equation.
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Perform the following operation.
(6.0 × 105) × (4.0 × 106)
X
What is the answer in correct scientific
notation?
Hint: Make sure the coefficient is a number
between 1 and 10.
A. 24 x 10¹¹
B. 24 x 10-¹
C. 2.4 x 10¹¹
D. 2.4 x 10¹2
Answers
the answer for the scientific notation is[tex]D. 2.4 x 10¹².[/tex]
explain about scientific notation ?Scientific notation is a way of writing numbers that is commonly used in science and mathematics to represent very large or very small numbers in a compact and convenient format. The notation expresses a number as a coefficient multiplied by a power of 10. The coefficient is a number between 1 and 10, and the power of 10 represents the number of zeros to the right (for positive powers) or left (for negative powers) of the decimal point.
To perform the multiplication [tex](6.0 × 10^5) × (4.0 × 10^6)[/tex], we can simply multiply the coefficients and add the exponents of 10:
[tex](6.0 × 10^5) × (4.0 × 10^6) = 24.0 × 10^(5+6) = 24.0 × 10^11[/tex]
To express the answer in correct scientific notation, we need to make sure the coefficient is a number between 1 and 10. We can do this by dividing the coefficient by 10 and adding 1 to the exponent of 10:
[tex]24.0 × 10^11 = 2.4 × 10^(11+1) = 2.4 × 10^12[/tex]
Therefore, the answer is[tex]D. 2.4 x 10¹²[/tex]
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If you save $200 a month, how many months until you can purchase the car?
Answers
It will take 50 months to save enough money to buy the car. Always remember that the actual time may be longer if other factors such as taxes, fees, interest rates, and etc. are considered.
The time it takes to save enough money to buy a car can be determined by the cost of the car and the amount that saved each month for the car . If you the cost of car that you decided to buy , you can divide it by the amount saved each month to calculate the number of months required to save enough money.
For example, if a car costs $10,000 and you decide to save $200 per month, you would need to save for:
time = cost ÷ savings per month
time = $10,000 ÷ $200 per month
time = 50 months
As a result, it will take 50 months to save enough money to buy the car. However, always remember that the actual time may be longer if other factors such as taxes, fees, interest rates, and etc. are considered.
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What is formula of ethane and it's electron dot structure
Answers
H-C-C-H
Which of the following conditions indicate an acidic solution at 25 °C? Select all that apply.
pOH = 9.66
pH = 4.25
[H+] > 1.0 x 10-7 M
[H+] > [OH-]
[OH-] > [H+]
Answers
Answer:
The conditions that indicate an acidic solution at 25 °C are:
pH = 4.25
[H+] > 1.0 x 10^-7 M
[H+] > [OH-]
Explanation:
Write the formula for nitrogenfluride?
Answers
Answer:
The formula for nitrogen fluoride is NF3.
Explanation:
Answer:
The chemical formula for nitrogen fluoride is NF3.Explanation:
One nitrogen atom and three fluorine atoms make up this poisonous and extremely reactive chemical. It is used to make fertilisers, refrigerants, and semiconductors.
Hope it helps! : )An aqueous NaCl solution is made using 112 grams of NaCl diluted to a total solution volume of 1 L. Calculate the molarity, Molality, and mass percent of solution
Answers
Molarity of solution is 1.91moles/L ,molaity of solution is 1.91mole/Kg and mass percent of solution is 99.8%
Molality is a proportion of the quantity of moles of solute in an answer comparing to 1 kg or 1000 g of dissolvable. This differentiations with the meaning of molarity which depends on a predetermined volume of arrangement.An ordinarily involved unit for molality in science is mol/kg. An answer of fixation 1 mol/kg is likewise once in a while signified as 1 molal. The unit mol/kg expects that molar mass be communicated in kg/mol, rather than the standard g/mol or kg/kmol.
We know that molarity=number of moles of solute/volume of solution in liters.
Now,number of moles of NaCl=112/molecular mass of NaCl.
Molecular mass of NaCl is 58.5g
So,number of moles of NaCl=112/58.5g=1.91moles
Now,molarity=number of moles of NaCl/volume of solution in liters
=>molarity=1.91/1=1.91moles/liters.
Now,molality=number of moles of NaCl/ amount of solvent in grams
Here,solvent is water so,amount of solvent in 1000gm
So,molality =1.91/1000g=1.91/1kg=1.91moles/Kg
Now,mass percent of solution =(mass of solute/total mass of solution) ×100
Mass of solute is 112g and total mass of solution is 112+1000+10g=1122g
Therefore,mass percent of solution =(112/1122)×100=99.98%
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when a 10.0 g sample of an unknown organic acid (contains c, h, o) is subjected to combustion analysis 21.2 grams of co2 and 3.25 g of h2o are produced. what is the empirical formula of the acid?
Answers
the empirical formula of the unknown organic acid is C9.5H3.55O2.5.
To find the empirical formula, we need to calculate the moles of carbon, hydrogen, and oxygen in the sample:
Moles of CO2 produced: 21.2 g CO2 x (1 mol CO2/44.01 g CO2) = 0.482 mol CO2
This represents the moles of carbon in the sample.
Moles of H2O produced: 3.25 g H2O x (1 mol H2O/18.015 g H2O) = 0.18 mol H2O
Moles of oxygen: The remaining mass of the sample after subtracting the mass of carbon and hydrogen is due to oxygen.
Mass of oxygen = 10.0 g - (21.2 g/44.01 g/mol x 12.01 g/mol + 3.25 g/18.015 g/mol x 2.02 g/mol) = 2.03 g
Moles of oxygen = 2.03 g / 16.00 g/mol = 0.127 mol
Carbon: 0.482 mol CO2 / 0.127 mol = 3.8
Hydrogen: 0.18 mol H2O / 0.127 mol = 1.42
Oxygen: 0.127 mol O2 / 0.127 mol = 1
These ratios indicate that the empirical formula is C3.8H1.42O1, but we need to convert this to a whole-number ratio. The simplest whole-number ratio is obtained by multiplying each subscript by 2.5:
C3.8H1.42O1 x 2.5 = C9.5H3.55O2.5
Therefore, the empirical formula of the unknown organic acid is C9.5H3.55O2.5.
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a water molecule stays in a living organism for about how long?
Answers
A water molecule typically stays in a living organism for a relatively short amount of time, typically a few minutes.
This is because water molecules are constantly being exchanged between different parts of the organism and the environment. Inside the organism, water molecules move in and out of cells, tissues and organs, and are also exchanged with the atmosphere. The process of exchanging water molecules between the organism and its environment is known as the water cycle. This cycle involves water molecules evaporating into the atmosphere, condensing, and then falling back down to Earth as rain or snow, where it is taken up by plants and animals, and then released back into the atmosphere. Water molecules are also exchanged between living organisms and their environment through diffusion, which is the movement of molecules from an area of higher concentration to an area of lower concentration. Therefore, even though a water molecule may stay in a living organism for a few minutes, it is constantly cycling through the organism and its environment.
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what mass (in grams) of carbon will have the same number of atoms as 195.4 grams of ca. report the final answer using the correct number of significant figures. do not put units and do not write your answer in scientific notation.
Answers
The mass of carbon that has the same number of atoms as 195.4 grams of calcium is 68.6 grams. The final answer should be reported as 68.6, with three significant figures.
The mass of carbon that has the same number of atoms as 195.4 grams of calcium is 68.6 grams. This is because the atomic mass of calcium is 40.08 and the atomic mass of carbon is 12.011. The number of atoms in 195.4 grams of calcium is 4.87 x 10^24, and the number of atoms in 68.6 grams of carbon is also 4.87 x 10^24. The final answer should be reported as 68.6, with three significant figures. This is because the atomic mass of calcium and carbon are given to three significant figures, so the final answer should also be reported to three significant figures.
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Which symbol is the correct notation for the element silicon?
Responses
Si
Si
SI
SI
S
S
Sil
Answers
The correct notation for the element silicon is "Si".
Silicon is a chemical element with the symbol Si and atomic number 14.
It is a metalloid, meaning that it has properties of both metals and nonmetals. Silicon is the second most abundant element on Earth, after oxygen, and it is a major component of rocks, sand, and minerals. It is also a crucial element in many technological applications, particularly in the electronics industry, where it is used to make semiconductors, computer chips, and solar cells.
Silicon has a crystalline structure and is a hard, brittle, and blue-grey material. It is not found in its pure form in nature, but is instead obtained from the purification of silicon dioxide, which is commonly found in sand and quartz. Silicon is also found in various minerals, such as mica, feldspar, and talc.
Silicon has many unique properties that make it useful in various applications. For example, it is a semiconductor, meaning that its electrical conductivity can be controlled by adding impurities to it in a process called doping. This property is essential for the production of electronic components, such as transistors and diodes.
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What is a hydrogen bond?
What is a Metallic bond?
What is a Covalent bond?
What is an Electrovalent or Ionic bond?
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Answers
An electrovalent or ionic bond is a type of chemical bond that occurs between two atoms when one or more electrons are transferred from one atom to another. This results in the formation of two ions with opposite charges that are attracted to each other by electrostatic forces, forming an ionic bond.
Typically, an ionic bond occurs between a metal and a nonmetal. The metal atom loses one or more electrons to become a positively charged ion or cation, while the nonmetal atom gains one or more electrons to become a negatively charged ion or anion. For example, in the formation of sodium chloride (NaCl), sodium donates an electron to chlorine, forming Na+ and Cl- ions that are attracted to each other to form an ionic bond.
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A new element with four naturally occurring isotopes has an average atomic mass determined to be 69.3680
amu. The first three isotopes have relative abundances of 24.36%, 33.56% and 10.22% and masses of 69.321
amu, 69.3863 amu, and 69.8741 amu respectively What is the mass of the fourth isotope?
Answers
The mass of the fourth isotope is approximately 100.9866 amu.
What is the mass of the fourth isotope?Let x be the mass of the fourth isotope.
Since the average atomic mass is determined to be 69.3680
amu, we can set up an equation using the given information to solve for x, the mass of the fourth isotope:
(0.2436)(69.321 amu) + (0.3356)(69.3863 amu) + (0.1022)(69.8741 amu) + (x)(0.2186) = 69.3680 amu
Simplifying and solving for x, we get:
16.8670336 amu + 23.27195028 amu + 7.13326402 amu + 0.2186x = 69.3680 amu
47.2722479 amu + 0.2186x = 69.3680 amu
0.2186x = 22.0957521 amu
x = 100.9866 amu
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A reaction is said to be ___________________ when the addition of free energy from the environment is required for the reaction to proceed.
Answers
When additional free energy from the surrounding environment is needed for a reaction to continue, it is said to be endergonic.
A chemical reaction or process is referred to as endergonic if free energy must be added for it to proceed. In an endergonic reaction, the reactants and products have different energy levels, and the reaction needs an external energy source to break through the activation energy barrier. This energy intake may originate from heat, light, or chemical energy sources. Endergonic reactions can't happen on their own; they need an ongoing supply of energy to function. A few endergonic processes are protein synthesis, photosynthesis, and the dissociation of ATP into ADP and phosphate. In living things, energonic processes play a significant role in metabolism and energy transfer.
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a red blood cell is placed into each of the following solutions. indicate whether crenation, hemolysis, or neither will occur. solution a: 4.19 % (m/v) nacl solution b: 1.78 % (m/v) glucose solution c: distilled h2o solution d: 7.6 % (m/v) glucose solution e: 5.0 % (m/v) glucose and 0.9 % (m/v) nacl
Answers
Following are the the effect of each solution on the red blood cells as per the given information :
a) crenation
b) neither
c) hemolysis
d) crenation
e) neither
The behavior of red blood cells (RBCs) in different solutions can be determined by comparing the tonicity of the solution to the tonicity of the RBC.
A hypertonic solution has a higher solute concentration than the cell and will cause water to move out of the cell, leading to crenation (shrinking) of the RBC.
A hypotonic solution has a lower solute concentration than the cell and will cause water to move into the cell, leading to hemolysis (bursting) of the RBC.
An isotonic solution has the same solute concentration as the cell and will not cause any net movement of water.
Using this given information, we can determine the effect of each solution on the RBCs:
a) 4.19% (m/v) NaCl solution is hypertonic to the RBC, so water will move out of the cell and cause crenation.
b) 1.78% (m/v) glucose solution is isotonic to the RBC, so it will not cause any crenation or hemolysis.
c) Distilled H2O is hypotonic to the RBC, so water will move into the cell and cause hemolysis.
d) 7.6% (m/v) glucose solution is hypertonic to the RBC, so water will move out of the cell and cause crenation.
e) 5.0% (m/v) glucose and 0.9% (m/v) NaCl solution is isotonic to the RBC, so it will not cause any crenation or hemolysis.
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