calculate the ph of a 0.42 m h2so3, solution that has the stepwise dissociation constants ka1 = 1.6 × 10-2 and ka2 = 6.4 × 10-8.
Answers
The pH of a 0.42 M H₂SO₃ solution with dissociation constants Ka1 = 1.6 × 10⁻² and Ka2 = 6.4 × 10⁻⁸ is approximately 1.99.
H₂SO₃ is a weak acid that undergoes two dissociation steps:
H₂SO₃ ⇌ H⁺ + HSO₃⁻
Ka1 = [H⁺][HSO₃⁻]/[H₂SO₃]
HSO₃⁻ ⇌ H⁺ + SO₃²⁻
Ka2 = [H⁺][SO₃²⁻]/[HSO₃⁻]
The concentration of H₂SO₃ is given as 0.42 M. Let x be the concentration of H⁺ ions that dissociate in the first step. Then, the concentration of HSO₃⁻ ions will be (0.42 - x) M, and the concentration of SO₃²⁻ ions will be x * Ka2 / (Ka1 - x). We can set up the following equilibrium expressions:
Ka1 = x*(0.42-x)/(0.42)
Ka2 = x*Ka2/[(0.42-x)*Ka1]
Solving for x using the quadratic formula, we get:
x = 1.02 × 10⁻² M
Therefore, the concentration of H+ ions in the solution is 1.02 × 10⁻² M. To calculate the pH, we can use the equation:
pH = -log[H⁺]
pH = -log(1.02 × 10⁻²) = 1.99
Therefore, the pH of a 0.42 M H2SO3 solution with Ka1 = 1.6 × 10⁻² and Ka2 = 6.4 × 10⁻⁸ is approximately 1.99.
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Related Questions
How do I find the pH of two different solutions if they have the same number of moles?
Answers
Answer:
You can use a PH tester do identify the PH of each solution. Depending on what solutions ur testing, u shouldn't mix them as for there could be either a minor or bad chemical reaction
Explanation:
P +2 Fe +1 N+1 S+6 Mg +2
Answers
Answer:
= P + 2eF + N + S + 6gM + 2
Explanation:
Multiply: 1 . N = N
= P + 2eF + N + 1 . S + 6gM + 2
Multiply: 1 . S = S
= P + 2eF + N + S + 6gM + 2
Hope This Helps!
what is the purpose or function of methanol in the synthesis of aspartame experiment? it serves as an initiating agent for polymerization. it is used as a meta director for the bromination step. it serves as a carbocation intermediate. it serves as a mild acid. it is used as a solvent.
Answers
The synthesis of aspartame, its primary function is as a solvent. In the synthesis of aspartame, methanol is primarily used as a solvent rather than serving any of the other functions you mentioned.
Aspartame is synthesized through a multi-step process that involves the condensation of two amino acids: L-phenylalanine and L-aspartic acid. Methanol is commonly used as a solvent in this process to facilitate the reaction between the amino acids and the other reagents involved. Methanol acts as a suitable solvent because it can dissolve both the solid reactants (amino acids) and the other necessary reagents, such as acid catalysts and protecting groups. By dissolving these substances, methanol helps create a homogenous reaction mixture, promoting the efficient reaction between the reactants. While methanol can have other applications in organic synthesis.
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consulting an activity series table, which of these metals will be oxidized by the ions of cobalt? a) nickel b) tin c) iron d) copper e) silver
Answers
Answer:
c) iron
Explanation:
I did that question and got it right
The correct answer is option c) Iron. Iron metal will be oxidized by the ions of cobalt
To determine which of these metals will be oxidized by the ions of cobalt, you need to consult an activity series table. The metals listed above are: a) nickel, b) tin, c) iron, d) copper, and e) silver.
Find the position of cobalt (Co) on the activity series table.
Compare the positions of the given metals (Ni, Sn, Fe, Cu, and Ag) to the position of cobalt.
Metals that are more active (higher on the table) than cobalt will be oxidized by cobalt ions.
Based on a standard activity series table, cobalt is less active than iron, but more active than tin, copper, nickel, and silver. Therefore, the metal that will be oxidized by the ions of cobalt is:
c) iron (Fe).
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1. 0 g of h_{2}o_{2} solution (30 wt%) was titrated with 22. 143 ml of kmno_{4} solution. What is the molarity of the kmno_{4} solution? Report your answer with three decimal places. Molar mass: H2O2 = 34. 01g/mol Reaction: 2MnO2 + 5H2O2 + 6H+ + 2Mn +2 +502 +8H2O Type your numeric answer and submit
Answers
The molarity of the KMnO4 solution is 0.532 M (rounded to three decimal places).
To calculate the molarity of the KMnO4 solution, we need to use the stoichiometry of the reaction and the volume of the KMnO4 solution used in the titration.
Given:
Mass of H2O2 solution = 1.0 g
Concentration of H2O2 solution = 30 wt% (weight percent)
Volume of KMnO4 solution used = 22.143 mL
Molar mass of H2O2 = 34.01 g/mol
Step 1: Calculate the moles of H2O2 in the solution.
Moles of H2O2 = (Mass of H2O2 solution) / (Molar mass of H2O2)
= 1.0 g / 34.01 g/mol
= 0.0294 mol
Step 2: Calculate the moles of KMnO4 based on the stoichiometry of the reaction.
According to the balanced equation, the ratio of KMnO4 to H2O2 is 2:5.
Therefore, moles of KMnO4 = (Moles of H2O2) * (2/5)
= 0.0294 mol * (2/5)
= 0.01176 mol
Step 3: Calculate the molarity of the KMnO4 solution.
Molarity (M) = (Moles of KMnO4) / (Volume of KMnO4 solution in liters)
= 0.01176 mol / 0.022143 L
= 0.5316 M
Therefore, the molarity of the KMnO4 solution is 0.532 M (rounded to three decimal places).
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Below is the structure for the amino acid glycine. Which bond angles are closest to the actual values for the h-n-c and o-c-o bond angles? consider all lone pairs of electrons as substituents when answering this question.
Answers
We have that the bond angles that are closest to the actual values for the h-n-c and o-c-o bond angles are
109.5 degrees.120 degrees.H-N-C and O-C-O bond anglesGenerally, In H-N-C bond nitrogen has Sp3 hybridization, it will have the angle 109.5 degrees.
In O-C-O bond C atom has sp^2 Hybridization so it will have the angle by 120 degrees.
Therefore,bond angles that are closest to the actual values for the h-n-c and o-c-o bond angles are
109.5 degrees.120 degrees.For more information on Bonding visit
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a container of gas has a pressure of 1.45 atm at a temperature of 52 degrees celsius, if the pressure increases to 4.2 atm what would be the final temperature of the volume is held constant?
Answers
Answer:
941 K (668°C)
Explanation:
We have the following data:
Initial pressure : P1 = 1.45 atm
Initial temperature: T1 = 52°C + 273 = 325 K
Final pressure: P2 = 4.2 atm
Final temperature: T2 = ?
The relation between pressure and temperature for a gas at constant volume is given by Gay-Lussac's law:
P1/T1 = P2/T2
That means that the pressure is directly proportional to the absolute temperature (in K). So, we calculate T2 from the equation:
T2 = P2 x T1/P1 = 4.2 atm x (325 K/1.45 atm) = 941 K
Therefore, the final temperature would be 941 K (668°C). This is consistent with the law, that states that if the pressure increase, the temperature will be increased.
Which of the following can be used as lubricant
Answers
Answer:
Explanation:
B is the ans
pls mark BRAINLIEST
Nomex, a condensation copolymer used by firefighters because of its flame-resistant properties, is formed between isophthalic acid and m-aminoaniline
Draw the structure of the dimer. (Hint: Water is eliminated when the bond between the monomers forms. )
Draw the molecule by placing atoms on the grid and connecting them with bonds. Include all hydrogen atoms
Answers
The structure of the dimer of Nomex is as follows:
To draw the structure of the dimer, we first need to draw the structure of the two monomers, isophthalic acid and m-aminoaniline:
Next, we need to eliminate a water molecule from the two monomers to form the dimer. This is done by removing a hydrogen atom from the amino group of m-aminoaniline and a hydroxyl group from isophthalic acid:
Finally, we can connect the two monomers together to form the dimer of Nomex:
This is the structure of the dimer of Nomex, which is a condensation copolymer formed between isophthalic acid and m-aminoaniline.
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Please answer it in 1 hour Write explanation if it needed I’ll give you upvote immediately Don’t use excel to solve this question i In a bond amortization schedule, what does the book value mean?Describe in words. (ii) Consider a n-period coupon bond where the redemption amount, C may not be the same as the face amount, F. Using j and g to represent the yield rate per period and modified coupon rate per period respectively, show that,for k = 01,2,n, the book value at time k,B is B=C+Cg-jan-kj and the amortized amount at time k is ii Let K = Cu. The Makeham formula to compute the price of a bond is given by A verbal interpretation for K would be that K is the present value of the redemption value C.Provide a verbal interpretation for(C-K)
Answers
Answer:
(i) In a bond amortization schedule, the book value represents the remaining amount of the bond principal that hasn't been paid off at a given point in time. When a bond is first issued, its book value equals its face value. As payments are made over the life of the bond, a portion of these payments reduces the book value. By the end of the bond's life, its book value will be zero, as the entire principal will have been paid off.
(ii) The formula for the book value B at time k, where k is the number of periods elapsed, is B = C + Cg - jan-kj.
Here:
- C is the redemption amount,
- g is the modified coupon rate per period,
- j is the yield rate per period, and
- a_n-kj is the present value of an annuity immediate with n - k periods at the yield rate j.
This formula states that the book value at any time k is the redemption amount plus the present value of the future coupon payments (Cg), minus the present value of the annuity that represents the repayments of the bond (jan-kj).
The amortized amount at time k is the change in the book value from time k-1 to time k, plus the coupon payment at time k. It represents the portion of the bond's principal (and interest) that has been repaid up to time k.
(iii) If K is defined as the present value of the redemption value C, according to the Makeham formula, (C-K) would represent the difference between the redemption value of the bond and its present value. This difference is the amount of interest that will accumulate over the life of the bond. In other words, (C-K) can be interpreted as the total interest that the bondholder will earn from holding the bond until redemption, assuming that all coupon payments are reinvested at the yield rate j.
Explanation:
70 POINTS NEED HELP ASAP. ONLY CORRECT ANSWERS PLEASE.
A calorimeter was filled with 200 g of water. The temperature of the water in the calorimeter dropped from 55.0 °Celsius to 22.6 °Celsius. The specific heat of water is 4.184 J/g°C. Calculate, q, the heat released by the reaction.
A. -27,112 J
B. -2710 J
C. 1891 J
D. 18,911 J
Answers
Answer:
A
Explanation:
We can use the heat transfer equation:
\(\displaystyle q = mC\Delta T\)
Therefore:
\(\displaystyle \begin{aligned} q_\text{sol} & = m_\text{sol}C_\text{sol}\Delta T \\ \\ & = (200.\text{ g})\left(\frac{4.184\text{ J}}{\text{g - $^\circ$C}}\right)(22.6\text{ $^\circ$C}-55.0\text{ $^\circ$ C}) \\ \\ &= (200.\text{ g})\left(\frac{4.184\text{ J}}{\text{g - $^\circ$C}}\right)(-32.4\text{ $^\circ$C}) \\ \\ & \approx -27112 \text{ J} \end{aligned}\)
In conclusion, the answer is A.
Note: Assuming that the reaction took place in the water, the heat released by the reaction should be positive instead of negative. Because the temperature of the water decreased, the reaction is endothermic. Hence, the water lost heat (what we calculated above) while the reaction absorbed heat. The heat released (or, rather, absorbed) by the reaction is thus +27,112 J. However, for the purposes of this question, A is the best choice.
What is the number of protons equal to in an element?
Atomic Mass
Number of neutrons
Atomic mass minus atomic number
Atomic numbers
Answers
Atomic numbers
This is the answer
How many significant figures are in the following number?
3600
a 1
b 2
c 3
d 4
Answers
Answer:
the answer is b. 2
hope it helps
If 2.564 g of nitrogen combines with 0.3689 g of hydrogen to yield compound x , how many grams of nitrogen would combine with 1.133 g of hydrogen to make the same compound
Answers
10.958 g of nitrogen would combine with 1.113g of hydrogen to make the same compound. This is calculated from the concept of mass ratio.
Mass ratio gives the mass of an element that is found in combination with another element. the number of atoms of each specific type must be the same on both sides of the equation. Mass ratio is also called as percent composition of the mass. This principle gives rise to the Law of Constant Composition.
If 2.564 g of nitrogen combines with 0.3689 g of hydrogen to yield compound x. then nitrogen would combine with 1.133 g of hydrogen to make the same compound. According to this,
mass of N2 in the 1st compound / mass of H2 in the 1st compound
= mass of N2 in the 2nd compound / mass of H2 in the 2nd compound
= 3.670 g / 0.5275 g = x / 1.575 g
x = 10.958 g of N2
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First, state your claim about how the Mesosaurus fossils got separated. Then, use evidence to support your claim. For each piece of evidence you use, explain how the evidence supports your claim. Be sure to include the words from the Word Bank!
Answers
Claim: The separation of Mesosaurus fossils can be explained by the continental drift hypothesis. Evidence: Fossil Distribution, Geological Similarities, Matching Climate and Habitat. The distribution of Mesosaurus fossils across South America and Africa, the geological similarities between these regions, and the matching climate and habitat conditions all support the claim that the separation of Mesosaurus populations can be explained by the process of continental drift.
Claim: The separation of Mesosaurus fossils can be explained by the continental drift hypothesis.
Evidence:
Fossil Distribution: Mesosaurus fossils are found in both South America and Africa. This distribution aligns with the hypothesis of continental drift, which suggests that these continents were once connected and later separated. The similarity in fossil remains on different continents supports the claim that Mesosaurus populations were separated when the continents drifted apart.
Geological Similarities: The geological formations and sedimentary layers in which Mesosaurus fossils are found in South America and Africa display remarkable similarities. This similarity implies that these regions were once part of the same landmass and were subsequently separated. The matching geological features provide further evidence for the separation of Mesosaurus populations due to continental drift.
Matching Climate and Habitat: Mesosaurus fossils indicate that the species was adapted to a freshwater environment. The presence of similar freshwater environments in both South America and Africa further supports the claim that Mesosaurus populations were separated when the continents drifted apart. The matching climate and habitat conditions provide evidence that supports the idea of geographic isolation and subsequent speciation.
In conclusion, the distribution of Mesosaurus fossils across South America and Africa, the geological similarities between these regions, and the matching climate and habitat conditions all support the claim that the separation of Mesosaurus populations can be explained by the process of continental drift.
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Which two scenarios illustrate the relationship between pressure and volume as described by Boyle’s law?
1. The pressure in a closed bottle decreases when the bottle is squeezed.
2. The volume of an underwater bubble increases as it rises and the pressure decreases.
3. The pressure increases in an inflated plastic bag when the bag is stepped on.
4. When air is blown into a balloon, the pressure and volume both increase.
Answers
Answer:
2) The volume of an underwater bubble increases as it rises and the pressure decreases
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a sci2 molecule has __ bonds and a __ molecular shape. As a result, SCI2 molecule is ___
Answers
Please help me answer this it’s due today. I will give brainliest
Answers
Answer: X should represent H, hydrogen.
Explanation:
The H is the only one that hasnt been stated in the left side of the formula. H has three atoms as well.
What quantity in moles of hydrogen gas at 150. 0 °C and 23. 3 atm would occupy a vessel of 8. 50 L?
Answer ASAP
Answers
The number of moles of hydrogen gas comes out to be 5.700 that can be calculated using the ideal gas equation.
Using ideal gas equation,
PV = nRT ......(1)
It is given that,
T = 150.0 °C
P = 23.3 atm
V = 8.50 L
To calculate the number of moles, substitute the known values in equation (1).
PV = nRT
23.3 atm x 8.50 L = n x 0.0821 L atm/mol/K x 423.15 K
n = (23.3 atm x 8.50 L) / (0.0821 L atm/mol/K x 423.15 K)
= 198.05 / 34.74 mole
= 5.700 moles
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Although ATP is the main energy currency in cells, other molecules, such as NAD, play a central role in some metabolic pathways by transferring electrons. The oxidized form of NAD is NAD+, and the reduced form is NADH. Identify the components of NAD+ and ATP. NH, O=P 0 NH, N OH OH O 0 NH 0 0 0 O=P-0 OH OH OH OH ATP NAD Answer Bank deoxyribose phosphate adenine nicotinamide ribose Select the components that are common to both ATP and NAD. ribose adenine deoxyribose phosphate nicotinamide
Answers
The components that are common to both ATP and NAD are: adenine and ribose. Adenine and ribose are both found in ATP and NAD molecules.
What are ATP and NAD?ATP stands for Adenosine Triphosphate, which is the primary energy carrier in cells. ATP is an energy-rich molecule that stores energy that can be used by the cell. It is composed of three phosphate groups, an adenine base, and a ribose sugar.
NAD stands for Nicotinamide Adenine Dinucleotide, which is an electron carrier molecule that is involved in many cellular metabolic reactions. It is composed of two nucleotides (adenine and ribose) linked by two phosphate groups.
The oxidized form of NAD is NAD+ while the reduced form is NADH.
The components of ATP and NAD are: Adenine and ribose are the two components common to both ATP and NAD.
Other components are specific to each molecule, as follows: ATP components: Three phosphate groups An adenine base A ribose sugar NAD+ components: Nicotinamide (a type of vitamin B3)Adenine A ribose sugar Two phosphate groups.
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__________ could be the formula of an alkene. a. c3h8 b. c2h8 c. c6h6 d. c3h6 e. c17h36
Answers
The general formula for alkenes is CnH2n, the formula with hydrogen count double the carbon count should be the correct formula for alkene and that is d. C3H6.
What are alkenes?
Alkenes, commonly known as olefins, are organic unsaturated hydrocarbons that have one or more carbon-carbon double bonds in their chemical structure and are composed of carbon and hydrogen atoms.
Alkenes are unsaturated hydrocarbons with a double bond between the carbon atoms. Carbon atoms are connected by at least one double bond. The general formula for alkenes is C n H 2n. Olefin is frequently substituted with alkenes. The word "olefin" comes from the Greek phrase "olefin gas," which denotes the production of oil.
Since, their general formula is CnH2n, the formula with hydrogen count double the carbon count should be the correct formula for alkene and that is d. C3H6.
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Sam wants to know how fast his brother can run. He knows the time it took for his brother to run
from the starting line to the finish line. What else does he need to know in order to calculate the
speed of his brother?
O He needs to know what time his brother ate lunch.
O He needs to know the direction his brother ran.
O He needs to know the distance from the starting line to the finish line.
Answers
Which equation shows the mathematical relationship between the frequency
and the period of a wave?
O A. T=2f
B. f = T-1
O C. T=1/f
O D. f =T
Answers
Answer:
c... just did it on a.pex
Answer:
O C. T=1/f
Explanation:
The period of a wave is the time taken for the wave to complete a cycle while the frequency of a wave is the number of cycles completed per unit time.
The period (T) is the inverse of frequency (f) and vice versa.
Hence mathematically, i can write;
T=1/f
If the Antarctic plate is estimated to move 2. 05 cm per year, how long did it take for the plate to move from point A to point B?
Answers
Answer:
They move at a rate of one to two inches (three to five centimeters) per year.
Explanation:
The movement of the plates creates three types of tectonic boundaries: convergent, where plates move into one another; divergent, where plates move apart; and transform, where plates move sideways in relation to each other.
Please answer with a correct answer!!! thank you so much
Answers
Write a readable story on the basis of following outlines. A farm girl carrying a bucket of milk on head ... thinking about selling milk ...... selling it to buy chickens ......... chickens laying eggs ....... selling eggs to buy many more chickens and cows selling cows to become rich ......... thinking of marrying rich men after putting off marriage proposal tripped over a stone milk spilled .............. not count chickens before hatched. .....
Answers
This one is from G_oogle
The Milkmaid and Her Pail
A farmer's daughter had been out to milk the cows, and was returning to the dairy carrying her pail of milk upon her head. As she walked along, she fell a-musing after this fashion: "The milk in this pail will provide me with cream, which I will make into butter and take to market to sell. With the money I will buy a number of eggs, and these, when hatched, will produce chickens, and by and by I shall have quite a large poultry-yard. Then I shall sell some of my fowls, and with the money which they will bring in I will buy myself a new gown, which I shall wear when I go to the fair; and all the young fellows will admire it, and come and make love to me, but I shall toss my head and have nothing to say to them." Forgetting all about the pail, and suiting the action to the word, she tossed her head. Down went the pail, all the milk was spilled, and all her fine castles in the air vanished in a moment!
- Do not count your chickens before they are hatched.
I tried to make my own but it turned out bad...
Hope this helps ❤️
Balancing Chemical Reactions Worksheet A glow stick is a popular toy and safety device. To use a glow stick, you bend a small flexible plastic tube to break a small glass capsule inside, at which point the stick begins to glow. How do you think this works
Answers
Answer:
Concept of chemi-fluorescence
Explanation:
A glow stick usually consists of two chemicals in a larger plastic tube: , a base catalyst (mostly sodium salicylate), and a suitable dye (sensitizer, or fluorophor). This creates an exergonic reaction when mixed together.
When a glow stick is bent, the flurophor which is a chemical that easily re-emits light upon excitation in smaller capsules is released into the other substance, there by causing it to emit radiation/light in the uv-visible region. The brightness and longevity of the glow stick is determined by varying the concentration of these chemicals.
I hope this explanation clarifies things.
Where does Respiration mainly take place in?
A - Mitochondria
B - The nucleus
C - The cell wall
D - The vacuole
Answers
Respiration happens in the cells of plants, animals and humans, mainly inside mitochondria, which are located in a cell's cytoplasm.
Which of the following statements is true about chemical nutrients in an ecosystem?
A. They cannot be obtained from decomposition.
B. They flow through the system, losing some nutrients in the process.
C. They exit the ecosystem in the form of heat.
D. They recycle within the ecosystem, being constantly reused.
E. They depend on sunlight as their source.
Answers
The statement that is true about chemical nutrients in an ecosystem is : D.) They recycle within the ecosystem, being constantly reused. Therefore, option D) is the correct answer.
The nutrient cycle is vital to the ecosystem, and this is how nutrients are recycled in it. Nutrients that are considered chemical nutrients include carbon, hydrogen, oxygen, nitrogen, and phosphorus.What are chemical nutrients in an ecosystem
Chemical nutrients refer to essential elements that are found in an ecosystem's physical and chemical environment. These elements are necessary for life because they are responsible for different functions such as cell structure, the production of enzymes, and the production of hormones.
In conclusion, chemical nutrients recycle within the ecosystem, being constantly reused. Nutrient recycling helps to maintain the ecosystem's sustainability. It helps to maintain the balance of life forms within the ecosystem.
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using a electron miscroscope, jane measured a rod-shaped bacterium and found it to be 0.00099345 meters in lenght. list the steps she should take to represnt this number
Answers
The transmission electron microscope (TEM) works much like a light microscope, transmitting a beam of electrons through a thin specimen and then focusing the.
What is transmission electron microscope?A stream of electrons is sent through a specimen during transmission electron microscopy (TEM), which produces a picture of the sample. The specimen is often a grid- or suspension-supported ultrathin segment that is less than 100 nm thick. As the beam passes through the specimen, a picture is created due to the interaction of the electrons with the material. The picture is subsequently enlarged and focussed onto an imaging device, such as a fluorescent screen, a sheet of photographic film, or a sensor like a scintillator linked to a charge-coupled device.
Due to the electrons' shorter de Broglie wavelength, transmission electron microscopes can image at a resolution that is substantially higher than that of light microscopes.
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question: Using an electron microscope, Jane measured a rod-shaped bacterium and found it to be 0.00000345 meters in length. List the steps she should take to represent this number in scientific notation.
Answer:
The coefficient of this value in scientific notation is 3.45.
The decimal point needs to be moved six places to the right, so the exponent is -6.
0.00000345 = 3.45 × 10-6
Explanation: edmentum sample answer