Answer:
C) 10.2
Explanation:
Formula: Actual-Expected/Expected
The actual was 55.2 while the expected was 50.1
55.2-50.1/50.1=0.101796407 * 100= 10.2%
The percentage error in the student's determination is 10.2%
The correct answer to the question is Option C. 10.2
From the question given above, the following data were obtained:
Measured value = 55.2 °C
Accepted value = 50.1 °C
Percentage error =?Next, we shall determine the absolute error. This can be obtained as follow:
Measured value = 55.2 °C
Accepted value = 50.1 °C
Absolute error =?Absolute error = |Measured – Accepted|
Absolute error = |55.2 – 50.1|
Absolute error = 5.1Finally, we shall determine the percentage error.
Absolute error = 5.1 °C
Accepted value = 50.1 °C
Percentage error =?[tex]Percentage error = \frac{Absolute error }{Accepted value} * 100\\\\= \frac{5.1}{50.1} * 100\\\\[/tex]
Percentage error = 10.2%Therefore, the percentage error in the student's determination is 10.2%.
The correct answer to the question is Option C. 10.2
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When KOH dissolved in ethanol, what is the intermolecular attraction between OH- ions and C2H5OH molecules
please help quick the 6th question is “What is a catalyst?” (include all three parts)
The charge of a single proton is 1.60 × 10–19 C. What is the nuclear charge of an atom of boron (B)?
Answer:
[tex]q=8\times 10^{-19}\ C[/tex]
Explanation:
Given that,
The charge of a single proton is [tex]1.6\times 10^{-19}\ C[/tex]
There are 5 protons in the nucleus. The nuclear charge of an atom of boron is given by :
[tex]q=5\times 1.6\times 10^{-19}\\\\q=8\times 10^{-19}\ C[/tex]
So, the required charge is [tex]8\times 10^{-19}\ C[/tex].
can someone please help me and don’t answer if you don’t know the answer please
thank you :)
What experiment did J. J. Thomson do?
A. He sent a cathode ray between electrically charged metal plates.
B. He suspended charged oil drops in a chamber.
C. He hit metal plates with light.
D. He shot alpha particles through gold foil
Answer:
A. He sent a cathode ray between electrically charged metal plates
which question is the student most likely trying to answer?
Answer:
A
Explanation:
Which of these is the main difference between aerobic respiration and anaerobic respiration?
Answer:
Aerobic Respiration
It can be found in the cytoplasm and the mitochondria.
Glucose breaks down into carbon dioxide and water.
Anaerobic Respiration
It can be found only in the cytoplasmic.
Glucose breaks down into ethyl alcohol, carbon dioxide and energy
Help me which is it
1. Which of the following best explains the motion of the box on the table?
Answer:
The box is at rest
Explanation:
not moving object
Which is the last element in the periodic table?
Answer:
Oganesson!
It is a synthetic chemical element with the symbol Og and atomic number 118. It was first synthesized in 2002 at the Joint Institute for Nuclear Research in Dubna, near Moscow, Russia, by a joint team of Russian and American scientists.
Answer:
the last element is ogasnesson
PLEASE HELP ASAP I WILL GIVE BRAINLIEST!
Consider the reaction pathway graph below.
The rate increases by a factor of 9 when the concentration of A triples. The rate triples when the concentration of B triples. What is the new rate law for the reaction?
A) endothermic because Hrxn=-876.8 kJ
B) endothermic because Hrxn=876.8kJ
C)exothermic because Hrxn= -1099.6kJ
D) exothermic because Hrxn=1099.6kJ
Answer:
B is the answer
Explanation:
Mitosis creates
that are
in chromosome number.
A) Somatic Cells ; Haploid
B) Somatic Cells: Diploid
C) Gametes: Haploid
D) Gametes ; Diploid
What is the noble gas configuration for zirconium?
Answer:
[Kr] 4d² 5s² option b will be correct answer
what are invertebrate? give any three example.
Answer:
Invertebrates are animals which do not have vertibral column. They do not debelop it also. For example: Arthropods , Crawfish and Sea Urchin.
What is the net ionic equation for this reaction?
FeCl3 + 3NaOH → Fe(OH)3 + 3NaCl
Answer:
2.6299
its easy
Which of the following might be included in a chemical
reaction?
a
Molecules
blons
Pure elements
d
All of the above
Answer:
b) ions
Explanation:
Answer: all of the above
Explanation:
Which of the above most likely represents Thomson's model of the atom?
What is the half-life of Technetium-99 if a 200 gram sample decays to 50 grams in 639,000 years?
Answer:
The half-life of Th-232 is 1.4 ∙ 10¹⁰ years.
In order to become a chemically stable ion, a neutral atom of sodium will _______.
A. lose one electron
B. lose two electrons
C. gain two electrons
D. gain one electron
Answer:
D. gain one electron
Explanation:
In order to become a chemically stable ion, a neutral atom of sodium will gain one electron. Therefore, the correct option is option D.
What is chemical stability?Chemical stability in chemistry refers to a chemical system's thermodynamic stability. When a system reaches its lowest energy state or in thermodynamic equilibrium with its surroundings, thermodynamic stability occurs.
It could be a spontaneous process when the total number of atoms or molecules in a given shape is conserved despite the fact that individual particles or atoms change forms. In order to become a chemically stable ion, a neutral atom of sodium will gain one electron.
Therefore, the correct option is option D.
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2. A pharmaceutical chemist runs a chromatography test on a substance
and identifies two of its components by comparing their Ry values
against certain standards. If the two components have Rf values of 1.0
and 0.41, and the solvent front has travelled 12.0 cm from the sample's
origin, what is the separation distance on the chromatogram?
Answer:
7.08 cm
Explanation:
For number 1;
Rf = d1/d2
d1/12 cm
Rf = 1.0
d1 = 12 * 1
d1 = 12.0 cm
For number 2
Rf = d1/d2
Rf = 0.41
0.41= d1/12
d1 = 0.41 * 12
d1 = 4.92 cm
Separation distance= 12.0 - 4.92 = 7.08 cm
What is the most important organ in the Nervous System and why?
Answer: More than likely it is the brain. Since this is the center for all nerves and it controls the whole body.
Which describes the molecule shown below?
O A. Unsaturated alkyne
O B. Saturated alkane
O C. Saturated alkene
O D. Unsaturated alkane
The description of the molecules shown is it is unsaturated alkynes. The correct option is A.
What are unsaturated alkynes?Alkynes are unsaturated double bond containing compound that react with hydrogen when a catalyst is present.
The pie bond shows that the hydrogen atoms are lost from the alkanes.
Thus, the correct option is A, unsaturated alkynes.
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The reaction represented by this graph is an exothermic reaction. According to the graph, which statement is true? Reactants have more energy than products. Products have more energy than reactants. Reactants and products have the same amount of energy.
Answer:
Reactants have more energy than products
Explanation:
Generally, in an exothermic reaction heat is released. In other words, energy is released. So you start with reactants which have a set amount of stored chemical energy, and you lose some in the reaction. Since energy is 'leaving', the stored chemical energy in the products is less than what we started with in the reactants. When given a graph, you can tell this is true because going from left to right, the line representing the stored chemical energy will start at a higher level than where it ends.
The true statement about an exothermic reaction is that reactants have more energy than products.
What is an exothermic reaction?An exothermic reaction is one in which the energy of reactants is greater than that of products. As such, energy is given off during the reaction in form of heat.
Thus, the true statement about an exothermic reaction is that reactants have more energy than products.
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What are gravitational forces?
Answer:
Gravity, or gravitation, is a natural phenomenon by which all things with mass or energy—including planets, stars, galaxies, and even light—are brought toward one another. On Earth, gravity gives weight to physical objects, and the Moon's gravity causes the ocean tides.
Gravity, also called gravitation, in mechanics, the universal force of attraction acting between all matter. ... On Earth all bodies have a weight, or downward force of gravity, proportional to their mass, which Earth's mass exerts on them. Gravity is measured by the acceleration that it gives to freely falling objects
The gravitational force is a force that attracts any two objects with mass. We call the gravitational force attractive because it always tries to pull masses together, it never pushes them apart. In fact, every object, including you, is pulling on every other object in the entire universe!
Gravitational force is the force that attracts to objects with mass. ... This forces tries to pull masses together, that is why attractive in nature. For example: When ball is thrown upwards it always come downwards after a certain height because the ball is pulled or attracted by the Earth's gravitation la force.
¯\_(ツ)_/¯
Answer:
Good Question!!! No one has found the answer to that question.
Explanation:
Which electromagnetic wave has the longest
wavelength? Describe the energy level and
frequency of this wave.
Answer:
radio waves
Explanation:
which has the longest wavelength and lowest frequency and energy. Ultraviolet light (UV) is divided into three regions: UV A, wavelength = 400 - 320 nm UV B, wavelength = 320 - 280 nm
which alkaline earth metal is the components of slaked lime
Answer:
calcium hydroxide.............
The Alkaline earth metal present in the following materials like lime stone , slaked lime , quicklime and gypsum is Calcium and the Alkaline earth metal present in Epsom salt is Magnesium.
What is the Alkaline Earth metal?The alkaline earth metals are those elements that correspond to group 2 in the modern periodic table which includes beryllium, magnesium, calcium, strontium, barium, and radium. The elements in this group are quite similar in their physical and chemical properties.
For above information, Calcium is the [tex]20^t^h[/tex]element and Magnesium is the [tex]12^t^h[/tex] element in the periodic table.
Chemically, the given materials which are mentioned above is represented in following manner.
Limestone is Calcium Carbonate -[tex]CaCO_3[/tex]
Slaked Lime is Calcium Hydroxide - [tex]Ca(OH)_2[/tex]
Quicklime is Calcium Oxide - CaO
Gypsum is Calcium Sulfate Dihydrate - [tex]CaSO_4.2H_2O[/tex]
Epsom salt is Magnesium Sulfate - [tex]MgSO_4[/tex]
Limestone decomposes into slaked lime on heating, and slaked lime is formed on hydration of slaked lime.Gypsum is an important component in the manufacture of cement. The hydrate of gypsum is known as Plaster of Paris.Epsom salt has some uses in plants.Thus, the Alkaline earth metal present in the following materials like lime stone , slaked lime , quicklime and gypsum is Calcium and the Alkaline earth metal present in Epsom salt is Magnesium.
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The above question is incomplete. Completed question is Which alkaline earth metal is the components of the following. Materials lime stone , slaked lime , quick lime , gypsum , Epsom salt.
How many moles are in 35.6 g of H2O
Answer:
Given
mass of H2O (m) =35.6g
molarmass (mr) = H2O ), 1x2+16=18g/mol
moles of H2O (n) =?
sln
n=m/mr
n=35.6g/18g/mol
n=1.978moles
the moles of H2O are 1.978moles
A skateboarder coasts a distance of 20 meters in 4 seconds. What is the person's speed?
Answer:
5
Explanation:
20/4
23) What is the chemical formula for carbon dioxide?
A CO2
B C2O
C CO2
D 2CO
Microwave radiation is absorbed by the water in food. As the water absorbs the heat it causes the food to get hot. If the wavelength of a microwave is 10, calculate the frequency and the energy of each photon.
Answer:
1) The frequency of each photon is 3.0 × 10⁹ Hz
2) The energy of each photon is 1.98786 × 10⁻²⁴ J
Explanation:
The energy, 'E', in a photon of light is given by Planck's equation as follows;
E = h·f = h·c/λ
Where;
E = The energy of a photon
h = Planck constant = 6.6262 × 10⁻³⁴ J·s
f = The frequency of the photon/radiation
c = The speed of light = 3.0 × 10⁸ m/s
λ = The wavelength of the photon/radiation
The given parameters of the microwave are;
The wavelength, λ = 10 cm = 0.1 m
The type of wave = Microwave
1) From E = h·f = h·c/λ, we find that the frequency, 'f' equals c/λ
∴ f = 3.0 × 10⁸ m/s/(0.1 m) = 3.0 × 10⁹ 1/s = 3.0 × 10⁹ Hz
The frequency of each photon, f = 3.0 × 10⁹ Hz
2) From E = h·f = h·c/λ, the energy, 'E', of each photon is given as follows;
E = h·c/λ = 6.6262 × 10⁻³⁴ J·s × 3.0 × 10⁸ m/s/(0.1 m) = 1.98786 × 10⁻²⁴ J
The energy of each photon, E = 1.98786 × 10⁻²⁴ J