Based on the results the students record, which group makes the most accurate measurements of the object?
Answers
Answer:
B.
Explanation:
It’s because when you subtract 78.5 and 77.5 you get 1. And when you do 79.5 and 78.5 you get 1 too. I know this because I got the answer right
Related Questions
a student starts with 1.157 g of copper chloride. after reacting with aluminum, he recovers 0.523 g of copper. what is the percent chlorine in the copper chloride? give the answer to correct significant figures.
Answers
Percent chlorine in copper chloride: 55% a student starts with 1.157 g of copper chloride. after reacting with aluminum, he recovers 0.523 g of copper.
To find the percent chlorine in copper chloride, divide the mass of chlorine in the original sample by the mass of the original sample, then multiply by 100%. The mass of chlorine can be calculated by subtracting the recovered mass of copper from the original mass of copper chloride. The correct number of significant figures must be used throughout the calculation to ensure accuracy.
Here's the calculation:
Start with the original mass of copper chloride=1.157 g
From the reaction, we know that 0.523 g of copper was recovered, so we can subtract that from the original mass to find the mass of chlorine:
=1.157 g - 0.523 g
= 0.634 g
To find the percent chlorine, divide the mass of chlorine by the original mass of copper chloride and multiply by 100:
(0.634 g / 1.157 g) * 100% = 55%
So, the percent chlorine in the copper chloride is 55% to two significant figures.
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two samples of matter from two different sources are analyzed and have the same mass percent composition of their elements. what can the samples be classified as?
Answers
If two samples of matter from two different sources have the same mass percent composition of their elements, they can be classified as isotopic compounds.
Isotopic compounds are compounds that have the same number and types of atoms, but they may have different isotopes of those atoms. Isotopes are atoms of the same element that have the same number of protons but a different number of neutrons.
Because they have the same number of protons, they have the same atomic number and chemical properties, but because they have different numbers of neutrons, they have different atomic masses and may have different physical properties.
When two samples have the same mass percent composition of their elements, it means that they have the same number of atoms of each element, and the weight of each element is also the same, which means that they are isotopic compounds.
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Which normal physiologic process contributes most to the need for acid-base balance?
Answers
C. Continuous metabolic production of free hydrogen ions
The processes of creating and breaking down glucose molecules are both examples of metabolic pathways. A metabolic pathway is a chain of related chemical reactions that feed each other. The pathway takes in a single or extra beginning molecule and, through a sequence of intermediates, converts them into merchandise.
Metabolism (stated: meh-TAB-uh-Liz-um) is the chemical reactions within the body's cells that alternate meals into power. Our bodies want this strength to do the entirety from moving to wondering to growing. particular proteins in the body manipulate the chemical reactions of metabolism.
A metabolic product is a compound produced via the cells and is excreted to the extracellular medium. it can be produced in the number one metabolism, e.g. carbon dioxide, ethanol, acetate, or lactate, or an extra complicated one, e.g. a secondary metabolite or a heterologous protein secreted to the extracellular medium.
The question is incomplete. Please read below to find the missing content.
Which normal physiologic process contributes most to the need for acid-base balance
A. Continuous organ production of bicarbonate from carbonic acid
B. Continuous alveolar exchange of oxygen and carbon dioxide
C. Continuous metabolic production of free hydrogen ions
D. Continuous kidney formation of urine from blood
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Can someone help me?
Which element would have the lowest electronegativity?
an element with a large number of valence electrons and a small atomic radius
an element with a large number of valence electrons and a large atomic radius
an element with a small number of valence electrons and a large atomic radius
an element with a small number of valence electrons and a small atomic radius
Answers
Answer:
an element with a large number of valence electrons and a large atomic radius
Explanation:
Electronegativity means a tedency when an atom attracts bonding electrons in a covalent bond situation.
» If an atom has many valency electrons [ empty orbitals in outermost shell ], it has difficulty in attracting electrons hence electronegativity low.
» If an atom is large, its nuclear attraction force of incoming electrons is low hence low electronegativity.
\(.\)
The element that would have the lowest electronegativity is an element with a small number of valence electrons and a large atomic radius.
Both electronegativity and atomic radius are periodic trends. Electronegativity increases across the period while atomic radius decreases across a period.
An element that has a small number of valence electrons and a large atomic radius will most likely be a metal hence it will have the lowest electronegativity.
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what best describes what forms in nuclear fission?
a. Two smaller, more stable nuclei
b. two larger, less stable nuclei
c. one smaller, less stable nucleus
d. one larger, more stable nucleus
Answers
Answer:
a. Two smaller, more stable nuclei
Explanation:
Answer:
a
Explanation:
took the quiz
What is the mass of an object if it produces a 20 N force with a 4m/s/s
acceleration?
Answers
Answer:
The answer is 5 kgExplanation:
To find the mass given the force and acceleration we use the formula
\(mass = \frac{force}{acceleration} \\ \)
From the question
force = 20 N
acceleration = 4 m/s²
We have
\(mass = \frac{20}{4} \\ \)
We have the final answer as
5 kgHope this helps you
In what way does a temporary magnet provide an advantage over a permanent magnet?
A temporary magnet is stronger than a permanent magnet.
A temporary magnet is larger than a permanent magnet.
A temporary magnet uses less current than a permanent magnet.
A temporary magnet allows the user to determine when it is magnetic.
Answers
Answer:
A temporary magnet allows the user to determine when it is magnetic.
A temporary magnet allows the user to determine when it is magnetic.
What is Temporary magnet?
A magnet that keeps its magnetic properties over an extended length of time is called a permanent magnet. Examples include iron, nickel, cobalt, and some alloys made of rare earth metals.
When they are in a strong magnetic field, temporary magnets simply behave like permanent magnets.
They lose their magnetic when the field is removed, in contrast to permanent magnets. Temporary magnets include things like paperclips, iron nails, and other materials of a similar kind.
Therefore, A temporary magnet allows the user to determine when it is magnetic.
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Select the reason cities tended to develop at the fall line on rivers.
Answers
Hope this helped
Please help! Giving 20 points!
Question: How can NASA scientists use Newton's third law of motion to plan for a space vehicle landing on a meteor? Make a claim. Support your claim with evidence from the article. Then, explain why the evidence supports your claim.
Article: https://newsela.com/read/lib-newton-third-law/id/54749/
Answers
Answer:
Explanation:
NASA uses rockets to launch astronauts and supplies to the International Space Station. Launching a rocket relies on Newton's Third Law of Motion. A rocket engine produces thrust through action and reaction. The engine produces hot exhaust gases which flow out of the back of the engine
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PLEASE HELP!!!!!!!
Joshua trees are dying due to global warming is a testable _________________.
Experiment
Problem
Observation
Hypothesis
it has the option to pick multiple.
Answers
Answer:
impacts on visiters
Explanation:
hope this is right sorry if its not
Joshua Tree suffers from air pollution and smog blowing into the park. Increased warming from climate change worsens the visibility from smog and air pollution, due to the chemistry of how smog reacts to heat.
what is the frequency of light when the energy of a single photon is 2.23 × 10-21 j?
Answers
The frequency of the photon of the light is 3.3 x 10¹² Hz.
The energy of the photon of light is 2.23 x 10⁻²¹J.
Now, we know, energy associated with the photon is given by the relation,
E = hv
Where,
E is the enrgy of the photon,
h is the Planck's constant,
v is the frequency of the light.
The value of Planck's constant is 6.63 x 10⁻³⁴ J/Hz.
Now, putting values,
2.23 x 10⁻²¹J = 6.63 x 10⁻³⁴ J/Hz(v)
v = 0.33 x 10¹³ Hz
v = 3.3 x 10¹² Hz.
The frequency of the photon is 3.3 x 10¹² Hz.
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Enter the masses of these particles in kilograms. Express the masses of proton and neutron to six significant figures. Express the mass of electron to two significant figures. Enter your answers in kilograms.
Answers
The masses of proton ( in kilogram) = 1.67262 × 10−27 kg ( six significant figure).
The masses of neutron ( in kilogram) = 1.67493 × 10−27 kg (six significant figure)The masses of electron ( in kilogram) = 9.1× 10−31 kg (two significant figure)Proton is a stable subatomic particle with symbols p, H+ or 1H+ and a positive charge of +1 e elementary charge. Its mass is slightly less than that of a neutron.
A neutron is a subatomic particle (symbol n or n⁰ ) with a neutral charge and a mass slightly greater than that of a proton. Protons and neutrons form the nucleus. Electrons, protons, and neutrons are the elementary particles that make up atoms. Atoms consist of a central nucleus containing neutrons and protons. Electrons revolve around the nucleus. Electrons are negatively charged, protons are positively charged, and neutrons are neutral. The electron mass is the mass of the rest electron, also known as the invariant mass of the electron.
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2CO(g) + O2(g) = 2CO2(g)
If 6.0 L of CO reacts at STP, how many liters of oxygen are required for the reaction?
Answers
Answer:
3.0 L O₂
Explanation:
If CO reacts at STP, it means that there are 1.0 moles of CO. To find the moles of O₂, you need to use the mole-to-mole ratio from the given equation.
1.0 moles CO 1 mole O₂
---------------------- x --------------------- = 0.5 moles O₂
2 moles CO
To calculate the liters of oxygen, you need to use Avogadro's Law:
V₁ / N₁ = V₂ / N₂
In this equation, "V₁" and "N₁" represent the volume and moles of the first molecule. "V₂" and "N₂" represent the volume and moles of the second molecule. You can plug the given and calculated values into the equation and simplify to isolate V₂.
V₁ = 6.0 L V₂ = ? L
N₁ = 1.0 moles N₂ = 0.5 moles
V₁ / N₁ = V₂ / N₂ <----- Avogadro's Law
(6.0 L) / (1.0 moles) = V₂ / (0.5 moles) <----- Insert values
6.0 = V₂ / (0.5 moles) <----- Simplify left side
3.0 = V₂ <----- Multiply both sides by 0.5
**I am not 100% confident on this answer. Please let me know if it is incorrect**
Answer:
2CO(g) + O2(g) → 2CO2(g)
If 9.0 L of O2 react at STP, how
many moles of CO2 form during the
reaction?
[?] mol CO2
Explanation:
What would it be if it was 9.0?
Scientific question: How does the choice of chemical ingredient in airbags influence their effectiveness.
How Airbags Work Let’s call it “engineered violence.” Airbags may seem soft and cuddly as long as they’re packed away in your steering wheel, dashboard, seats, or pillars, but what makes them work is their ability to counteract the violence of a collision with a structured sort of violence of their own. Every airbag deployment is literally a contained and directed explosion.
“We don’t like to use the word ‘explosion’ around here,” claims Ken Zawisa, the global airbag engineering specialist responsible for frontal airbag strategies at GM. “But it is a very fast, well-controlled chemical reaction. And heat and gas are the result.” The term “airbag” itself is misleading since there’s no significant “air” in these cushions. They are, instead, shaped and vented nylon-fabric pillows that fill, when deployed, with nitrogen gas. They are designed to supplement seatbelt restraints and help distribute the load exerted on a human body during an accident to minimize the deceleration rate and likelihood of injury. But while “supplement the seatbelt” is the mission of airbags, federal regulations require that they be tested and made effective for unbelted occupants, vastly complicating their task. Airbags must do their work quickly because the window of opportunity—the time between a car’s collision into an object and an occupant’s impact into the steering wheel or instrument panel—lasts only milliseconds. For illustration’s sake, imagine a Corvette hitting a bridge abutment head-on at 30 mph. The clock starts the instant the tip of the car’s nose hits concrete. The Mechanics There are six main parts of an airbag system: an accelerometer; a circuit; a heating element; an explosive charge; and the bag itself.
The accelerometer keeps track of how quickly the speed of your vehicle is changing. When your car hits another car—or wall or telephone pole or deer—the accelerometer triggers the circuit. The circuit then sends an electrical current through the heating element, which is kind of like the ones in your toaster, except it heats up a whole lot quicker. This ignites the charge which prompts a decomposition reaction that fills the deflated nylon airbag (packed in your steering column, dashboard or car door) at about 200 miles per hour. The whole process takes a mere 1/25 of a second. The bag itself has tiny holes that begin releasing the gas as soon as it’s filled. The goal is for the bag to be deflating by time your head hits it. That way it absorbs the impact, rather than your head bouncing back off the fully inflated airbag and causing you the sort of whiplash that could break your neck. Sometimes a puff of white powder comes out of the bag. That’s cornstarch or talcum powder to keep the bag supple while it’s in storage. (Just like a rubberband that dries out and cracks with age, airbags can do the same thing.) Most airbags today have silicone coatings, which makes this unnecessary. Advanced airbags are multistage devices capable of adjusting inflation speed and pressure according to the size of the occupant requiring protection. Those determinations are made from information provided by seat-position and occupant-mass sensors. The SDM also knows whether a belt or child restraint is in use.
Today, manufacturers want to make sure that what’s occurring is in fact an accident and not, say, an impact with a pothole or a curb. Accidental airbag deployments would, after all, attract trial lawyers in wholesale lots. So if you want to know exactly what the deployment algorithm stored in the SDM is, just do what GM has done: Crash thousands of cars and study thousands of accidents. The Detonation: Decomposition Reactions Manufacturers use different chemical stews to fill their airbags. A solid chemical mix is held in what is basically a small tray within the steering column. When the mechanism is triggered, an electric charge heats up a small filament to ignite the chemicals and—BLAMMO!—a rapid reaction produces a lot of nitrogen gas. Think of it as supersonic Jiffy Pop, with the kernels as the propellant. This type of chemical reaction is called “decomposition”. A decomposition reaction is a reaction in which a compound breaks down into two or more simpler substances. A reaction is also considered to be decomposition even when one or more of the products are still compounds.
This is what you're answering not the scientific question: Use the scientific question and the reading above to inform the reader of the goals related to to the airbag experiment.
Answers
The choice of chemical ingredients in airbags influences their effectiveness in several key ways:
1. Rate and speed of gas generation. The chemicals must decompose rapidly enough to fill the airbag before the occupant impacts the steering wheel or dashboard. Slower reactions will not produce enough gas quickly enough. Faster reactions can lead to over-pressurization and airbag rupture.
2. Total volume of gas produced. The ingredients must generate enough gas to rapidly inflate the airbag to an adequate size. Not enough gas will result in an under-inflated bag that does not properly cushion the occupant.
3. Controlled deflation. The airbag must deflate in a controlled manner as the occupant moves into it. Chemicals that produce gas too quickly can lead to an over-inflated bag that does not absorb impact energy effectively. The ingredient proportion and composition can influence how quickly the bag deflates.
4. Modulation for different impacts. More advanced airbags use sensors to determine the severity of impact and size of the occupant. The chemical system must be able to modulate deployment accordingly by speeding up, slowing down, or terminating gas generation at the appropriate times. This helps prevent unnecessary airbag deployment or inadequate cushioning for different event scenarios.
5. Stability and safety. The chemical ingredients must remain stable and non-hazardous until deployed. They cannot be overly volatile, corrosive or reactive prior to collision. Proper encapsulation and housing of the chemicals is also required to avoid leaks that could activate the airbag inadvertently or lead to harm from exposure.
In summary, the choice of airbag chemicals involves balancing these different and sometimes competing goals to achieve rapid, controlled and modulated deployments that properly cushion occupants while also ensuring stability, safety and avoiding unnecessary airbag operations. The ingredients, proportions and overall system design must all be optimized to meet the complex requirements for effective airbag performance.
What type of bond describes a transfer of
electrons between atoms of opposite charges?
A. covalent bond
C. neutron bond
4
B. ionic bond
D. proton bond
Answers
Answer:
B (ionic bond)
Explanation:
Because it is! :)
because opposites attract.
What volume of O2 is produced when 28 g of hydrogen peroxide (H2O2) decomposes to form water and oxygen at 150°C and 2.0 atm?___ H2O2 (aq) → ___ H2O (l) + ___ O2 (g)
Answers
Answer:
The volume of O2 is 7.11L.
Explanation:
1st) It is necessary to balance the chemical reaction:
\(2H_2O_2\rightarrow2H_2O+O_2\)The reaction is balanced, because there is the same amount of each element in both sides of the reaction.
2nd) From the balanced reaction, we know that from 2 moles of hydrogen peroxide (H2O2), 1 mole of oxygen gas is produced. Now, using the molar mass of hydrogen peroxide (34g/mol), we can calculate the number of moles of O2 that will be produced from 28g of H2O2:
- Conversion from grams to moles:
\(28g*\frac{1mole}{34g}=0.82moles\)- Number of moles of O2 produced:
\(\begin{gathered} 2molesH_2O_2-1moleO_2 \\ 0.82molesH_2O_2-x=\frac{0.82molesH_2O_2*1moleO_2}{2molesH_2O_2} \\ x=0.41molesO_2 \end{gathered}\)3rd) Finally, we can calculate the volume of O2 using the Ideal Gases formula, replacing the values of pressure (2.0atm), number of moles (0.41moles) and temperature (150°C=423K):
\(\begin{gathered} P*V=n*R*T \\ 2.0atm*V=0.41moles*0.082\frac{atm*L}{mol*K}*423K \\ 2.0atm*V=14.22atm*L \\ V=\frac{14.22atm*L}{2.0atm} \\ V=7.11L \end{gathered}\)Remember that to use the Ideal Gases formula, the units must be: atm, liter, mol and Kelvin.
So, the volume of O2 is 7.11L.
what is the positive ion in aluminum and oxygen
Answers
Answer:
Three Oxygen atoms gains two electrons each ( total of six) from two Al atoms, each Al atom loses three electrons (total of six) to three oxygen atom , in this process each Al atom becomes Al3+ ion and Oxygen atom after gaining two electrons becomes O2− ion
Explanation:
Three Oxygen atoms gains two electrons each ( total of six) from two Al atoms, each Al atom loses three electrons (total of six) to three oxygen atom , in this process each Al atom becomes Al3+ ion and Oxygen atom after gaining two electrons becomes O2− ion
What is a spontaneous change? What role does kinetics play in determining the apparent spontaneity of a chemical reaction? Select all that apply.A spontaneous change occurs by itself, without continued outside assistance.Kinetics plays no role in determining if a change is spontaneous.A spontaneous change occurs only with continued outside assistance.In thermodynamic terms, a spontaneous change has a negative ΔG.Kinetics must be considered when determining if a change is spontaneous.In thermodynamic terms, a spontaneous change has a positive ΔG.
Answers
A spontaneous change occurs by itself, without continued outside assistance. Kinetics must be considered when determining if a change is spontaneous. In thermodynamic terms, a spontaneous change has a negative ΔG.
A spontaneous change is a process that occurs without the need for external intervention or energy input. In thermodynamics, such a change is associated with a negative change in Gibbs free energy (ΔG) and indicates that the process is energetically favorable. However, the apparent spontaneity of a chemical reaction can be influenced by kinetics, which considers the rates and mechanisms of the reaction. Even if a reaction has a negative ΔG, it may not occur spontaneously if the activation energy is too high or the reaction pathway is unfavorable. Therefore, kinetics must be considered in addition to thermodynamics when determining the spontaneity of a chemical reaction.
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What is the half-life of a 100. 0 g sample of nitrogen-16 that decays to 12. 5 g of nitrogen-16 in 21. 6 s?.
Answers
The time required for a 100 g sample of nitrogen-16 to decompose into 12 g of nitrogen-16 in 21. 6 s is 7.2 seconds.
Initial weight N₀=100 g
Final weight N=12.5 g
Time t=21.6 sec
\(t_{1/2}\)=?
Solution:
t=n∗\(t_{1/2}\)
N/N₀=(1/2)ⁿ
12.5/100=(1/2)ⁿ
1/8=(1/2)ⁿ
(1/2)³=(1/2)ⁿ
Thus,
n=3
\(t_{1/2}\)=t/n
\(t_{1/2}\)=21.63/3
\(t_{1/2}\)=7.2 sec
Consequently, the sample's above half-time is 7.2 sec.
A sample is described as a smaller set of data that a researcher selects from a larger population using a predetermined selection procedure. Observations, sample points, or sampling units are terms used to describe these components. An effective way to carry out research is to create a sample. The majority of the time, it is either difficult, expensive, or time-consuming to conduct a population-wide study. Insights are thus gained by studying the sample that the researcher can then extrapolate to the overall population.
For instance, suppose a cell phone maker wanted to survey US university students about their favorite features. An extensive research study is necessary if the researcher wants to find out the features that students utilize, the features they would want to see, and the price they are prepared to pay.
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When writing the formulas for a compound that contains a polyatomic ion, ... ?
Answers
Answer:
The cation is written first in the name; the anion is written second in the name. Rule 2. When the formula unit contains two or more of the same polyatomic ion, that ion is written in parentheses with the subscript written outside the parentheses.
When writing the formula of a compound that contains polyatomic ion, the metal is written first followed by the central atom in the ion and then other atoms that surround the central atom.
A poly atomic ion refers to an ion that comprises of more than one atom. Such ions are common in chemistry. Examples of polyatomic ions include; PO4^3-, BH4^- etc.
When writing the formula of a compound that contains a polyatomic ion, the metal is written first then the central atom in the ion follows before other atoms that surround the central atom in the ion.
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Radioactive Decay: A 20kg shipment of Plutonium 243 is being transferred from Brookhaven National Laboratory to the Los Alamos National Laboratory 2,100 miles away. If all goes well, it should take 32 hours to make the shipment. If this isotope of Plutonium has a half-life of just 5 hours, how much radioactive material will remain after the trip? Nearly zero 17.8kg 3.125kg 178 grams Nearly the full 20kg 237 grams
Answers
The initial mass of Plutonium-243 is 20kg and it has a half-life of 5 hours.
The shipment is done in 32 hours.
The decay constant of Plutonium-243 can be found from its half-life:λ=ln(2)/t1/2 where, λ = decay constant, and t1/2 = half-lifeλ=ln(2)/5λ=0.13863 hr⁻¹
The number of half-lives is given by; N=t/ t1/2 where, N = number of half-lives, t = time, and t1/2 = half-lifeN=32/5N=6.4 ≈ 6 half-lives
The amount of Plutonium-243 left after the shipment is given by; N=N₀e^(-λt)where, N₀ = initial amount, e = 2.718 (constant), λ = decay constant, and t = time.
The initial amount of Plutonium-243 = 20kg. N = 20 × e^(-0.13863 × 32)N = 3.126 kg ≈ 3.125 kg
After the shipment, only 3.125 kg of Plutonium-243 will remain.
Therefore, the correct option is 3.125kg.
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why are green plants important to both humans and animals?
Answers
Answer:
green plants can perform photosynthesis which allows them to make their own food, and provide carbon dixiode.
If 43.7 g of iron is completely used to produce 62.5 g of iron (III) oxide, how many grams of oxygen are involved in the reaction?
Answers
Mass of Oxygen : 18.8 g
Further explanationReaction(balanced) :
4Fe + 3O₂ → 2Fe₂O₃
mass Fe = 43.7 g
mol Fe(MW= 55,845 g/mol) :
\(\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{43.7}{55.845}\\\\mol=0.783\)
mol O₂ : mol Fe = 3 : 4, so mol O₂ :
\(\tt \dfrac{3}{4}\times 0.783=0.5873\)
Mass O₂(MW=32 g/mol) :
\(\tt mass=mol\times MW\\\\mass=0.5873\times 32\\\\mass=18.7936~g\approx 18.8\)
Or simply you can Conservation of mass, where the masses before and after the reaction are the same
mass reactants=mass products
mass iron+mass oxygen=mass iron (III) oxide
43.7 g + mass oxygen=62.5 g
mass oxygen = 62.5 - 43.7 = 18.8 g
The element that doesn't occur in elemental state in nature is
Answers
Answer:
technetium, atomic number 43; promethium, number 61; astatine, number 85; francium, number 87; neptunium, number 93; and plutonium, number 94.
Explanation:
How much heat must be transferred to 55 g of ice to change the ice's
temperature from -13°C to -5.0°C? (The specific heat capacity of ice is 2.11
J/g.°C)
Answers
Q= m x c x t
M= 55 g
C=2.11
T=8
what is the correlation between the number of different codons of an amino acid and the frequency of the amino acid in proteins for this bacteria?
Answers
The number of different codons for an amino acid and the frequency of the amino acid in proteins is correlated for a given bacterium. The codon usage bias of the bacterium helps to dictate the frequency of the amino acids in proteins.
There are 64 different codons for 20 different amino acids, and this implies that multiple codons can encode the same amino acid. However, the occurrence of synonymous codons in a bacterium's genome is not uniform, and some codons are used more frequently than others. This phenomenon is known as codon usage bias, and it varies between bacterial species.
This is determined by the tRNA population and other factors that may impact gene expression. There is a correlation between the number of different codons for an amino acid and the frequency of that amino acid in proteins for a given bacterium. For example, the bacterium Escherichia coli has 4 codons for phenylalanine, with UUU being the most frequent. As a result, phenylalanine is one of the most frequent amino acids in E. coli proteins.
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How many atoms are in 80.45g of magnesium
Answers
Answer:
see below
Explanation:
1. 1 mol Mg = 24.31 g = 6.02 *10^23 atoms
calculate the number of atomsin 80.45g Mg
Numberof atoms = 6.02*10^23 Mg atoms / 24.31 g * 80.45 g
= 1.99*10^24 atoms
2.1 mol C-12 = 12.01g = 6.02 * 10^23 atoms
calculate the mass using
= 12.01 g C / 6.02*10^23 atoms * 100 atoms
= 1.99 * 10^-21 g
Answer:
1.9926 * 10 ^24
Explanation:
Molar Mass - Use Periodic table!
M ( Mg ) = 24.31 g / mole
n = 80.45 g : 24.31 g/mole = 3.31 moles
N a ( Avogadro`s constant ) = 6.02 * 10 ^23
N = Na * n = 6.02 * 10 ^24 * 3.31 = 19.926 * 10 ^23
How is ph important during digestion? a. digestion needs a constant ph to take place. b. different foods have different ph values. c. enzymes react best with acids. d. different enzymes work best at different ph values.
Answers
The value of pH is important during digestion because d. different enzymes work best at different pH values.
What is a protein enzyme molecule?A protein enzyme molecule is a biomolecule used during digestion to carry out the chemical reaction in order to break down foods into smaller particles, which are well known to lower the activation energy requires to produce such reactions.
Protein enzyme molecules are well known to act under certain conditions and the maximum work rate of an enzyme depends on the environment which involves the pH value associated with the presence of hydrogen protons that are able to interact with the substrates of different digestive enzymes.
Therefore, with this data, we can see that protein enzyme molecules are able to lower the activation energy of a given chemical reaction and they work under specific environmental conditions including the pH of the media.
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What is it called if there are 4 electrons are being shared?
Answers
When electrons are shared between two atoms, they make a bond called a covalent bond. Let us illustrate a covalent bond by using H atoms, with the understanding that H atoms need only two electrons to fill the 1s subshell.
A hot air balloon rises because the fire warms up the air and the air circulates to fill the balloon and lift it at the same time. What type of heat transfer is this?
Answers
Answer:
convection
Explanation:
Convection is a mode of heat transfer in which the particles of a substance actually move from place to place.
During convection, warmer and less dense air rises while colder and denser air sinks downwards under gravity.
Hence; when hot air balloon rises because the fire warms up the air and the air circulates to fill the balloon and lift it at the same time, convection has taken place.