percentage error in the student’s experiment is 0.8%
To find percentage error we use the formula I E -T I / I T I X100
so by the given data experimental value is 99.2ºC and actual theoretical value is 100.0ºC by putting the values we get 0.8% error.
To determine how closely the measured number resembles the real value, the percentage error is calculated. It is a component of a thorough error analysis. In most domains, % error is always reported as a positive figure, although in some, either a positive or negative value is acceptable.
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Answer: B
Explanation: :)
what is the mean of 35, 2, 33,25 70,75 40,42,12,15,7,44,20,25,3,65,62,
31 answer
trust me
what is the mean of 35, 2, 33,25 70,75 40,42,12,15,7,44,20,25,3,65,62,
its 31
the symbol for xenon (xe) would be a part of the noble gas notation for the element antimony. cesium.
The symbol for xenon (xe) would be a part of the noble gas notation for the element cesium.
For writing the electronic configuration of any element by using the preceding noble gas configuration, we simply use the symbols of noble gas belongs to the previous period of that particular elements. We can't use the symbol of noble gas of same period from which the element belong.
A is the wrong option because the noble gas in the preceding period to the period from which antimony belongs is krypton.
The actual electronic configuration of antimony is as follow:
[Kr] 4d10 5s2 5p3
B is correct option because the noble gas in the preceding period to the period from which Cesium belongs is Xenon.
The actual electronic configuration of Cesium is as follow:
[Xe] 6s1
Thus, we concluded that the symbol for xenon (xe) would be a part of the noble gas notation for the element cesium.
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what is the maximum number of covalent bonds that an oxygen atom with atomic number 8 can make with hydrogen? question 4 options: 1 6 4 2
Maximum number of covalent bonds that an oxygen atom can make with hydrogen is 2.
the ground state electronic configuration of oxygen is 2s² 2p⁴ that means it has 6 electrons in its valence shell and require two electrons are required to complete its octate. Two bonds are created when an electron donor atom shares the two needed electrons with oxygen. The ability of two oxygen atoms to share valence electrons results in the creation of a double bond between the two atoms.There are no longer any empty orbitals in the octet of oxygen after it is complete. As a result, it is unable to accept more electrons or create more bonds.Therefore, Oxygen can only generate two bonds because it needs two additional electrons to complete its octet, after which it will run out of empty orbitals in which to receive additional electrons and create additional bonds.
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if the bonds of a reactant molecule break so that simpler molecules, atoms or ions form, the reaction is an exchange reaction.
If the bonds of a reactant molecule break so that simpler molecules, atoms or ions form, the reaction is an exchange reaction called decomposition reaction
What is a decomposition reaction ?Decomposition reactions occur when complex chemical entities split apart into smaller components. Decomposition reactions often demand energy input. For instance, the thermal breakdown of potassium chlorate (KClO3) is a typical technique used in laboratories to generate oxygen gas.
Heat-induced breakdown is known as thermolysis. Decomposition caused by electricity is known as electrolysis. Decomposition brought on by light is referred to as photolysis. Heat-induced chemical reaction when one material splits into two or more compounds.The opposite of a combination reaction is supposedly a decomposition reaction. A chemical decomposes into two or more components in a decomposition reaction, whereas in a combination reaction, two or more substances combine to create new molecules while also releasing energy.Learn more about Decomposition reaction here:
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How many bonds are broken in the balanced reaction of the combustion of nitric oxide.
Answer:3
Explanation:
In the balanced reaction of the combustion of nitric oxide (NO), two bonds are broken.
Nitric oxide (NO) is composed of a nitrogen atom bonded to an oxygen atom. During combustion, NO reacts with oxygen (O2) to form nitrogen dioxide (NO2). The balanced chemical equation for this reaction is:
2 NO + O₂ → 2 NO₂
In this reaction, there are two molecules of nitric oxide (NO) on the left-hand side of the equation. Each nitric oxide molecule has one nitrogen-oxygen bond, so there are a total of two bonds in the reactants.
On the right-hand side of the equation, there are two molecules of nitrogen dioxide (NO2). Each nitrogen dioxide molecule has two nitrogen-oxygen bonds, so there are a total of four bonds in the products.
To balance the equation, two nitric oxide molecules are needed to produce four nitrogen dioxide molecules. This means that during the reaction, two nitrogen-oxygen bonds are broken in the reactants, and four new nitrogen-oxygen bonds are formed in the products.
In summary, in the balanced reaction of the combustion of nitric oxide, two bonds are broken.
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Complete the model of a sodium chloride crystal by dragging the chlorine and sodium atoms to their correct positions.
The model is completed by inserting the sodium and the chloride ions in alternate positions.
What is a model?It is common to show the arrangement of atoms or ions in a substance by the use of models. In the realm of science, a model could be used for the purpose of explanation or for the purpose of prediction. It is also possible to use a model as the way that we can be able to underscore and understudy the properties of a molecule.
Now we know that sodium chloride is an ionic compound. The ionic compounds are crystalline. This implies that the ions are arranged in a regular and a repeating pattern which enables the substance to have a definite shape as well as a high melting and a high melting point.
It then follows from the image that the ions of sodium and chlorine do occupy alternate positions in the solid in order to maximize the interaction between the ions. It then follows that the model is completed by inserting the sodium and the chloride ions in alternate positions.
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Please help me with chemistry questions!
1. A dog with a mass of 3.5 kg goes for a run at a pace of 1.4 m/s. What is the
dog's kinetic energy?
Three solutions of ph 4. 00, ph 7. 00 and ph 10. 00 are used to calibrate a ph meter. These solutions are known as.
These solutions used to calibrate a pH meter are known as pH buffer.
A buffer can be defined as a substance that prevents the pH of a solution from changing by either releasing or absorbing H⁺ in a solution.
Buffer is a solution that can resist pH change upon the addition of an acidic or basic components and it is able to neutralize small amounts of added acid or base, pH of the solution is relatively stable.
pH (potential of hydrogen) is a numeric scale used to specify the acidity or basicity of an aqueous solution:
When pH is less than seven (pH<7), solution is acidic.
When is equal seven (pH = 7), solution is neutral.
When pH is greater than seven (pH > 7), solution is basic.
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A child attending daycare is prescribed 750 mg of an antibiotic for 10 days. The drug may be dosed in several ways and is available in two concentrations. Which dosing regimen will the provider consider to best assure drug adherence? group of answer choices 375 mg of a 250 mg/5 ml solution po twice daily 250 mg of a 250 mg/5 ml solution po three times daily 250 mg of a 500 mg/5 ml solution po three times daily 375 mg of a 500 mg/5 ml solution po twice daily
The best kind of prescription for the child is 250 mg/5 ml solution po three times daily.
What is a dose?The term dose has to do with the quantity or amount of the drug that a patient is required take. We must know that a drug is a chemical and being a chemical, there must be a specified amount of it that has to be taken per day.
We know that the dose of the drug that is given to a patient is sometimes in proportion to the degree of symptoms that the patient is feeling. In this case, we can see that the drug is given in more than one dose. We now have to find out the correct dose of the drug that is required in this case.
Let us look at the drug, we are told that a child attending daycare is prescribed 750 mg of an antibiotic for 10 days. The best kind of prescription for the child is 250 mg/5 ml solution po three times daily.
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How many valence electrons does Neon (atomic #10) have? (1pt)
*
1 point
1
7
8
10
8 valence electron are present in Neon .
What is valence electron?The electrons in an atom's outermost shell, or energy level, are called valence electrons.
The amount of electrons an atom has in its outermost valence shell determines how it bonds with other atoms.
The Periodic Table groups together elements whose atoms have the same number of valence electrons for this reason.
Neon, with a Z=10, possesses eight valence electrons. Due to its closed-shell structure, neon is extremely difficult to oxidise and decrease.
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minoxidil 5% versus combined fractional co2 laser and topical minoxidil 5% in treatment of male androgenetic alopecia.
Objective: To compare the efficacy of topical minoxidil 5% alone and combined topical minoxidil 5% and fractional laser in the treatment of male androgenic alopecia and detection of any side effects occurring with each line of treatment.
Patients and Methods: This prospective randomized comparative controlled study was conducted for one year on 40 patients with male androgenic alopecia attending our Patient. Patients were classified into two groups: Group A received minoxidil alone (minoxidil group) and group B where patients received minoxidil plus fractional CO2 laser.
Results: In groups A and B, there was a statistically significant improvement between the clinical assessment scale at baseline and after 1 month (p<0.001). Also, there was a statistically significant improvement between the clinical assessment scale after 1 month and after 3 months (p=0.002). In group A, there was a statistically significant improvement between the clinical assessment scale at baseline and after 1 month, however, there was no statistically significant improvement between the clinical assessment scale and after 3 months. In group B, there was a statistically significant improvement between the clinical assessment scale at baseline and after 1 month, however, also, there was a statistically significant improvement between the clinical assessment scale and after 3 months.
Conclusion: Our study revealed the superiority of combination therapy, using a fractional laser and 5% minoxidil, over 5% minoxidil alone, for the treatment of male AGA, with no serious adverse effects of treatment identified.
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Perform the following problem. Round your answer appropriately.
8.1456 - 5.12 =
The difference between 8.1456 - 5.12 will be 3.0256 and rounding it off will give 3.
How to subtract the numbers?It should be noted that the information given is that we should subtract 5.12 from 8.1456.
It should be noted that subtraction is used when we want to deduct a number from another number. It is taking away a number form another one.
In this case, we will take away 5.12 from 8.1456. This will give the difference between the numbers.
Therefore, 8.1456 - 5.12 = 3.0256
Therefore, the difference is 3.0256 and rounding it appropriately will give a value of 3.
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while water is boiling, it absorbs 2257 kj of heat per kilogram of water. this takes place at a constant temperature of 100°c. what is the entropy change of 10 kg of water while it boils? (be careful of your energy units). (1 point)
The entropy change is 6.051 x 10^4 J/K
Given:
mass of water = 10 kg
latent heat of boiling = 2257 kj
constant temperature = 100°c
To Find:
entropy change of 10 kg of water
Solution:
entropy change = mass*latent heat of boiling/temperature
= 10×2257×1000/(273+100) K
= 22,570,000/373K = 6.051 x 10^4 J/K
Hence, entropy change is 6.051 x 10^4 J/K
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The gaseous state of a substance is due to:
A) the strong bonds between particles
B) the attractions between electrostatically charged particles
C) the high inertia of the small particles
D) the high inertia of the large particles
E) the high-speed motion of particles
Answer:
A the strong bonds between particles.
Explanation:
this is because in solids we say that they have a weak boling point due to the strong bond that makes it hard to melt
The molar mass of hydrochloric acid is 36.461 g/mol. If 1.2 g of HCl are dissolved in 25ml of solution, what is the molarity?
You have 250ml of a 0.75 M lithium nitrate solution. How many moles are in it?
If you want to make a 0.25 M solution of sodium sulfate, and you use 0.75 L of water, how many moles of sodium sulfate should you add?
You have 56 mL of a 1.1 M lithium iron (II) phosphate solution. How many moles are in it?
If you want to make a 6.0 M of HCl, and you use 2.00 L of water, how many moles of HCl should you add?
use the formula M=n/V, where M=molarity, n=moles of solute, V= volume in litres
1.3M
0.02 mols
0.188 mols
0.062 mols
12 mols
you have 3.8 kg of water. one mole of water has a mass of 18 g/mole and each molecule of water contains 10 electrons since water is h2 o. what is the total electron charge contained in this volume of water? the elementary charge is 1.6 × 10−19 c . answer in units of c.
The total electron charge contained in this volume of water is 8.565 x 10⁷c.
Equation :N total = N mole (10e⁻ / molecule) Nₐ
Nₐ = 6.022 x 10²³ molecules / mole
N mole = mass / molecular weight
= Vp / mol wt
= (1.6 × 10⁻¹⁹ c) (10³ kg /m³) / 18 g / mole (10⁻³ kg/g)
= 88.89 moles
N total = N mole (10e⁻ / molecule) Nₐ
N total = 88.89 moles (10e⁻ / molecule) (6.022 x 10²³ molecules / mole)
N total = 5.353 x 10²⁶e⁻
Q total = N Total (-e)
Q total = (5.353 x 10²⁶) (1.6 × 10−19 c )
Q total = 8.565 x 10⁷c
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The volume of a container is found to be 38. 5 in3. What is the volume in units of cm3?
The volume of a container is found to be 38. 5 in3. What is the volume in units of cm3?
Explanation:
631cm^3
Which of the following is the smallest?
A) salt grains
B) water molecule
C) human red blood cells
D) C. Difficile Bactria
Answer:
it's either a or b not c or d. there you go hope I helped
Explanation:
salt grains are very small, just like water molecule. so yea, hope I helped you out whoever you are.
Have you heard of the campaign: “Say No To Plastics”. Coin a few more slogans of this kind. There are certain governmental and non-governmental organisations who educate the general public on how to make wise use of plastics and develop environment friendly habits. Find out organisations in your area which are carrying out awareness programmes. If there is none, form one.
Answer:
Helping Hand Organization
I NEED HELP ASAP PLEASE !!
Answer:
The last option. Because it's not a curate or precise on the dot.
Which two words from the paragraph help
you understand the meaning of marine?
A "China" and "Japan"
B "coastal" and "seaweed"
C centuries" and "people”
D. superfood" and "studies”
a compound differs from a mixture in that a compound always has : a. a maximum of two components. c. a definite composition. b. a heterogeneous composition. d. at least three components
Compounds are formed by the combination of two or more molecules. A compound differs from a mixture as the former has a definite composition. Thus, option c is correct.
What are compounds, and mixtures?Compounds are said to be substances that have been composed of various identical molecules bonded together by chemical bonds. They are homogenous substances that have fixed ratios ad proportions.
Mixtures are substances composed of various substances linked by the physical interactions that vary in composition and can be homogenous and heterogeneous.
Therefore, option c. the compounds have fixed composition, unlike the mixtures.
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The speedometer at right displays a car's speed in miles per hour. (65 mph)
What is the car's speed in km/h? (1 km = 0.62 mile)
Answer:
57 mph 91.73 kph
58 mph 93.34 kph
59 mph 94.95 kph
60 mph 96.56 kph
is the answer
Explanation:
the equation for reaction between calcium carbonate and hydrochloric acid is shown. CaCO3 + 2HCl —> CaCl2 + H2O + CO2 how many moles of calcium carbonate will give 24 cm3 of carbon dioxide when reacted excess of the acid?
Answer:
0.001 mole
Explanation:
I attached my answer
how many electrons can an atoms third energy level hold
Mrs. Richardson performed an experiment on how the type of music affected plant growth. She sets up an experiment playing rock music, jazz music, country music, and rap music to fern plants. She also has a fern plant that she puts in a quiet room. She measures how tall the plants have grown after 4 weeks. They all received the same amount of water and light.
What is the dependent variable?
a
Rock, jazz, country, rap, and no music
b
Amount of water and light
c
Type of music
d
Plant growth
The dependent variable in this type of experiment is referred to as the Plant growth and is therefore denoted as option D.
What is Dependent variable?This refers to a type of variable whose value will change depending on the value of another variable which is referred to as the independent variable. It is also referred to the variable which is usually tested or measured when an experiment is done by scientists.
In this case, we were told that the plant were exposed to different criteria such as the music types and the constants such as light and water and the effect on the plant growth will be measured after sometime.
Since the parameter to be measured is the plant growth then it is referred to as the most appropriate choice for dependent variable.
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Jenny experiences an average downward force of 441 N anywhere she goes
The mass of the object could now be obtained as 45 Kg.
What is gravity?We define the term gravity as the force that drags an object down to the center of the earth. We know that every object that is found on earth has a mass. The mass of the object means that it is acted upon by the force of gravity.
Again we can obtain the weight of the object as the influence of the gravitational force on an object. In fact we define the weight of the object as the gravitational force that acts on an object. As such, the gravitational force or the weight of the object is given in Newton’s.
Given that;
Weight = mass * acceleration due to gravity
Mass = Weight/ acceleration due to gravity
Weight of the object = 441N
Acceleration due to gravity = 9.8 m/s^2
Mass of the object = 441N/9.8 m/s^2
= 45 Kg
The mass of the object could now be obtained as 45 Kg.
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when two amino acid monomers are positioned so that the carboxyl group of one is adjacent to the amino group of the other, they can be joined through a
They can be joined through a Peptide bond
The amino acids serve as the foundation for proteins. Water is produced when the amino acids are linked to form a lengthy chain of acids via amino and carboxyl. The main protein is made up of these long chain amino acids.
When the carboxyl group of one molecule combines with the amino group of the other molecule, a molecule of water is released, and a peptide bond is created between the two molecules (H2O). This condensation event, sometimes referred to as a dehydration synthesis reaction, typically takes place between amino acids.
What is a Peptide bond ?The carboxyl group of one amino acid is joined to the amino group of another to produce a peptide bond, also known as a eupeptide bond. In essence, a peptide link is an amide-type covalent chemical bond.
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________ can be
made in the field or in the laboratory.
Answer:
observations
Explanation:
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