moles of atoms in 50 atoms of barium are 301.15 × 10^23
We may determine how many chemicals or particles are included in one mole using Avogadro's number.Chemistry's fundamental building block is an atom. It is the smallest fraction of matter into which electrically charged particles cannot be released. It is also the smallest piece of substance with chemical element-like characteristics.A mole of any substance is equal to 6.023 x 10^23, or Avogadro's number. Additionally, it is employed to express concentrations in terms of moles per litre or molecular weight.The number of atoms in exactly 12 grammes of pure carbon-12 is the value of a mole.Chemical element barium has the chemical symbol Ba and atomic number 56. In group 2, it is the fifth element.1 mole of substance = 6.023 x 10^23
so in 50 atoms of Ba = 50 × 6.023 × 10^23
= 301.15 × 10^23
Therefore, moles in 50 atoms of Ba is 301.15 × 10^23.
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If+10+pints+of+a+5%+solution+are+diluted+to+40+pints,+what+is+the+percentage+strength+of+the+dilution?
an organism that could be classified as an autograph is a) mushroom
b) bean plant c) segmented worm or d) frog
Answer:
Bean Plant
Explanation:
This is because a bean plant produces it's own food.
1. Identify three surface processes that are
part of the rock cycle. Explain the role of
each process in the cycle. sc.7.E.6.2
0
The three processes that change one rock to another are crystallization, metamorphism, and erosion and sedimentation.
The three main elements of the rock cycle are metamorphism, erosion, and crystallization.
Crystallization:
In the earth or on the surface, magma cools and solidifies to form igneous rocks. Crystallization occurs as the magma cools, resulting in the formation of various crystals at various temperatures. For instance, olivine crystallizes from magma at temperatures substantially greater than those at which quartz does.
Sedimentation and Erosion:
Rocks at the surface of the Earth are broken down into smaller bits through weathering. These sediments are moved from one location to another by erosion in the form of running water, ice, and gravity. The accumulating sediment must be crushed and bonded together in order to form a sedimentary rock.
Metamorphism:
A rock undergoes metamorphosis when it is subjected to intense heat and pressure inside the Earth yet does not melt. The rock's texture and mineral makeup may change as a result of metamorphism. A metamorphic rock may therefore have a new mineral composition or structure.
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A 100 g mass is weighed three times on a balance and the following results are obtained: 95.0g, 94.9g, 95.1
g. are these measurements accurate? are they precise?
A 100 g mass is weighed three times on a balance and the following results are obtained: 95.0g, 94.9g, 95.1 g.
These measurements are precise because the answer are almost same and are slightly different from each other.
The given measurements are not accuracy because it shows how they both close the measurement is to be true for the accepted given value.
Where as
Precision shows to how measurement value of the similar substance or particles are to each other.
In this the outcomes agree with the one another.
Both the accuracy and precision shows the answer in most generic outcomes in an experiment.
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Does the surface of the moon change at any time, in any way? Why or why not?
Help now please
Answer:
The moons surface is changing
a substance is tested in a lab. it is found to maintain a unique shape and is a good conductor of electricity. if it is made up of electrons, protons, and neutrons, what state of matter is this substance most likely to be? gas liquid
This substance's state of matter is most likely Solid.
How can one tell if it is a good conductor of electricity or not?
The ability of the electricity to move the electrons through a material determines its conductivity; the more free electrons a metal has, the better it conducts electricity. Most good conductors are metals, and almost all the metals are solid.
If it is made up of electrons, protons, and neurons, the state of matter in this substance is most likely to be solid.
The substance's distinctive shape, which is a distinguishing characteristic of solids, was observed when it was tested in the lab. They are also excellent conductors of electricity. The common element found in every state of matter, electrons, protons, and neutrons, are present in solids. This entire information demonstrates its solidity.
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The density of nickel is 8.9 g/cm3. How many cubic decimeters does 1335 grams of nickel occupy?
If the density of nickel is 8.9 g/cm3, it occupies 0.15 cubic decimeters in 1335 grams of nickel.
Density is defined as the mass of a unit volume of a material substance, the space occupied by the unit mass of a material. It is the degree of compactness measured by the quantity of mass per unit volume.
density = mass/ volume
volume = mass/ density
here the given mass is = 1335 grams
and the density given is = 8.9
=1335/8.9
=150
therefore volume calculated is 150 cubic centimeter
1 cubic centimeter is equal to 0.001 cubic decimeter
150 cubic centimeter is equal to 0.15 cubic decimeter
If the density of nickel is 8.9 g/cm3, it occupies 0.15 cubic decimeters in 1335 grams of nickel.
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Explain how mass and energy are similar using the law of conservation of mass and the law of conservation of energy.
The similarity between law of conservation of mass and law of conservation of energy is that no new substance is created in both rather they are conserved.
What is law of conservation of mass?
Law of conservation of mass states that the mass can neither be created nor destroyed but is transformed from one form to another.
What is law of conservation of energy?The law of conservation of energy states that energy can neither be created nor destroyed - only converted from one form of energy to another.
Example of law of conservation of energyWhen a toy car is rolled down a ramp the gravitational potential energy at the given height will be converted into kinetic energy of the toy car.
Thus, the similarity between law of conservation of mass and law of conservation of energy is that no new substance is created in both rather they are conserved.
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A nitrogen oxide contains 30. 45% n mass. If the molar mass of the compound is 90. ± 5 g/mol, what is its molecular formula?.
The molecular formula of the compound is
[tex]N _{2}O _{4}.[/tex]
The empirical formula of the compound is,
[tex] \frac{30.4 \: g}{14.01 \: g \: mol^{ - 1} } = 2.17 \: mol \:of \: N[/tex]
[tex]\frac{69.6 \: g}{16.0 \: g \: mol^{ - 1} } = 4.35\: mol \: of \: O[/tex]
In the compound, 2.17 moles of Nitrogen are present.
In the compound, 4.35 moles of oxygen are present.
The empirical formula of the compound is
[tex]NO _{2}.[/tex]
The molecular formula of the compound is,
[tex]Molecular \: Formula = (EF) _{n}[/tex]
[tex] = 2 \times (14.01 + 2 \times 16.00) \: g \: mol ^{ - 1} [/tex]
n = 2
[tex]The \: molecular \: formula \: is \: N _{2}O _{4}[/tex]
and the compound is dinitrogen tetroxide. It is the dimer of nitrogen dioxide.
Therefore, the molecular formula of the compound is
[tex]N _{2}O _{4}.[/tex]
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Which of the following is a function of a nerve cell?
The correct answer choice about the function of a nerve cell is: They send and receive electrical impulses.
The correct answer choice from the above is option b.
What is a nerve cell?Nerve cells or neurons are are bundle of fibers which are connected through out the nervous system which helps detecting, recieving and sending information in informed.
The nerve cell are also known neurons are like electrical wires which runs throughout the body system in sending and receiving information.
So therefore, the correct answer choice about the function of a nerve cell is: They send and receive electrical impulses
Complete question:
Which of the following is a function of a nerve cell?
a. They released hormones
b. They send and receive electrical impulses
c. They are concerned with osmoregulation
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how do you find the density
(01.06 MC)
The gas carbon dioxide is a pure substance. Which of the following is true about carbon dioxide?
Group of answer choices
A:Carbon and oxygen are chemically bonded in it.
B:Carbon and oxygen retain their original identity in it.
C:It can be separated into carbon and oxygen using physical methods.
D:The proportion of carbon and oxygen is different in different samples of the gas.
Answer:
It can be chemically separated if it is a compound. The gas carbon dioxide is a pure substance.
Explanation:
Carbon dioxide is a pure substance because it has a fixed composition no matter where it was taken. Each molecule of carbon dioxide will always have 1 carbon and 2 oxygens.
help please I don’t understand and this is due tomorrow.
Answer:
9.2% is the answer
Explanation:
In this question asking for the percent error of the students calculated density. The formula that will be given;
density = 9.78g/cm^3
d = 9.78g/cm^3
accepted is on the RT table S = 8.96g/cm^3
%error = (measured - accepted)/accepted * 100%
%error = (9.78 - 8.96/8.96) * 100%
%error = 9.15% or approximately 9.2%
1
When a person goes out in the sun, it is recommended they wear sunscreen. Why is sunscreen recommended outside, but not with indoor lights?
Answer:
discuss product service process position and paradigm innovation provide practical examples for echa
you intend to prepare 500 ml of a 0.1m solution of nacl, but you forget to remove the stir bar when you bring the solution to volume. the stir bar has a volume of 1 ml and weighs 4 g. what is the percent error in your molarity?
We intend to prepare 500 ml of a 0.1m solution of NaCl, but you forget to remove the stir bar when we bring the solution to volume. the stir bar has a volume of 1 ml and weighs 4 g, the percent error in our molarity is 0.2%.
What is percent error?Percent errors indicate how big our errors are when we measure something in analysis process. Smaller percent errors indicate that we are close to accepted or original value.
For example, a 1% error indicates that we got very close to accepted value, while 48% means that we were quite a long way off from the true value. Measurement errors are often unavoidable due to certain reasons like hands can shake, material can be imprecise, or our instruments just might not have capability to estimate exactly.
The percent error formula will let us know how seriously these inevitable errors influenced our results.
Percent error is difference between estimated value and the actual value in comparison to the actual value and is expressed as a percentage. In other words, the percent error is relative error multiplied by 100.
The percent error formula
Formula for percent error is:
PE = (Estimated value-Actual value|/ The Actual value) × 100
0.1% M NaCl
Amount of NaCl require to prepare 0.1M NaCl calculated:
M1= [tex]\frac{1000*x}{58.5*500}[/tex]
x= 2.95g
but stir bar consume 1ml so actual value of solution is not 500ml but it is 500-1= 499ml
so, molarity= [tex]\frac{1000*2.925}{58.5*499}[/tex]
M2= 0.1002M
%error= [(M1-M2)/M1]*100
=0.2%
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Which of the following is an unsafe lab procedure?
Fire. It's all fun and games until someone ignores the Bunsen burner! ...
Heat Burns. Handling hot items hastily without the proper tools can result in serious burns. ...
Chemical Burns. ...
Cuts and Scrapes. ...
Contamination. ...
Inhalation. ...
Spills and Breaks.
A 30 kg 30kg30, start text, k, g, end text dog runs at a speed of 15 m s 15 s m 15, start fraction, start text, m, end text, divided by, start text, s, end text, end fraction. What is the dog’s kinetic energy?
A 30 kg dog runs at a speed of 15 m/s.
What is the dog’s kinetic energy?
Answer: 3,400 J
JJ Thomson describes the atom with the plum-pudding model.
Describe Thomson’s model of the atom and why it was incorrect.
Thomson suggested that an atom's model resembling a plum pudding,
According to Thomson, an atom consists of a positively charged sphere with embedded negatively charged electrons. and an atom is electrically neutral because the positive and negative charges within it are of equal magnitude.
J.J. Thomson used a Crookes, or cathode ray, tube to conduct experiments that led to the discovery of the electron in 1897. He provided evidence that cathode rays have a negative charge. He also investigated positively charged neon gas particles. Thomson discovered that positively or negatively charged particles were not included in the conventional atomic model. As a result, he suggested a plum pudding-like model of the atom. The raisins in the dessert were the negative electrons, and the positive charge was in the dough.
The positive charges in the atom were not recognized as particles by Thomson's model of the atom, despite the fact that it did explain some of the electrical characteristics of the atom due to the electrons.
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Consider one of the procedures where amylase and starch are reacting. If there is strong amylase activity and it is breaking down starch, then you would assign an enzyme activity level of ________.
Consider one of the procedures where amylase and starch are reacting. If there is strong amylase activity and it is breaking down starch, then you would assign an enzyme activity level of 3.
The amount of starch left in a solution or the enzyme activity can both be used to assess the enzyme activity. By including compounds like iodine to the sample, which will express, through various degrees of the blue hue, the enzyme activity level, both of them can be done qualitatively.
In the majority of enzymatic tests, the rate of substrate consumption or product generation during a specified time period is used to compute the enzyme activity. The rate of NADH oxidation is watched in the case of PDC and ADH.
An enzyme-catalyzed reaction initially progresses at a faster pace as substrate concentration rises. This rise in reaction rate levels off as the substrate saturates the enzyme molecules.
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when do you consider that a material has undergone physical change?
Answer:
Physical changes occur when object or substances undergo a change that does not change their chemical composition
it's when the appearance of the matter changes but the kind of matter does not
Explanation:
examples of physical changes:breaking glass
boiling water
melting ice
crumpling of paper etc
Hope this helpsAce that homework
Good luck ✅View the spinner. on which colors is it equally likely that the spinner will land? red and blue green and red blue and green yellow and green
Red and blue are spinner equally on land.
Explanation:The probability that a spinner will land on a different color:
[tex]p=\frac{total number favorable outcome}{total number of outcomes}[/tex] = [tex]\frac{total number favorable outcomes}{12}[/tex]
Probability of getting the spinner landing on red = [tex]\frac{3}{12} = \frac{1}{4}[/tex]
Probability of getting the spinner landing on green = [tex]\frac{4}{12} = \frac{1}{3}[/tex]
Probability of getting the spinner landing on blue = [tex]\frac{3}{12} = \frac{1}{4}[/tex]
Probability of getting the spinner landing on yellow = [tex]\frac{2}{12} = \frac{1}{6}[/tex]
Red and blue colors both have the same probability which means
that the chances of the spinner to land on red and blue colors are
equal.
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On red and blue, the spinner will land.
What is the probability of red and blue?Mathematics' field of probability deals with numerical assessments of how likely an event is to occur.
p = Total no of favorable outcomes/ Total number of outcomes.
Probability of getting the spinner landing on red = 3/12 = 1/4
Probability of getting the spinner landing on green = 4/12 = 1/3
Probability of getting the spinner landing on blue = 3/12 = 1/4
Probability of getting the spinner landing on yellow = 2/12 = 1/6
Blue and red have the same probability, so this indicates
that the spinner's chances of landing on the hues red and blue are
equal.
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A classmate tries to explain why an object looks red and black. Read the two statements, and determine if your classmate was correct.
Red: "When light hits an object, it absorbs all of the frequencies of visible light except for red. The red frequency is reflected to your eyes and you see the color red."
Black: "When light hits an object, it absorbs all of the frequencies of visible light except for black. The black frequency is reflected to your eyes and you see the color black."
The classmate is correct with her statement about how red colour is seen but incorrect about how black colour is seen.
How do we see colours?There are seven colours in light as follows:
RedOrangeYellowGreenBlueIndigoVioletHowever, we are able to see these colours based on which one is reflected or absorbed. A colour is seen when it is reflected. This means that a red colour will be seen when an object absorbs all other colour but reflects red.
However, when all the colours of light are absorbed without reflecting any, an object is seen as black.
Therefore, it can be concluded that the classmate is correct with her statement about how red colour is seen but incorrect about how black colour is seen.
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Consider the aluminum foil that you used. What evidence do you have that the aluminum foil contained impurities? how would this affect your calculated percent yield of alum?.
Yes, the aluminium foil is impure and contains a mixture of substances that affects the percentage yield as the impurities in it are added to the total weight of the end product.
In homes and commercial sectors, aluminium foil has many uses. It is used for storing food, baking cookies and cakes, and also as food wrappers.
People also use aluminium foil to store delicate food items such as meat and vegetables.
According to research, aluminium foil is not a pure substance as some of its particles leaches into food thus posing serious health problems.
This foil contains microparticles of iron, zinc, gallium and silicon. Moreover, the colouring and paint on it cause harmful impacts when it is exposed to heating.
Furthermore, it also affects the percentage yield by increasing the total weight of the end product.
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help me !! Using the solubility curve, what is the effect of increased temperature on the solubility of KBr in 100 grams of water?
According to the graph, increasing the temperature of the solution will increase the solubility of KBr.
What is the relation between solubility and temperature?There is direct relationship between solubility and temperature because if one increases the other decreases whereas if one decreases the other is also decreases. The higher temperature of the solution is, the easier a solid will be able to dissolve in that solution while on the other hand, the lower is the temperature of the solution, the solid will not dissolve easily. In the graph, we can see that the line of KBr moves in the upward direction which clearly shows that with increasing temperature, the solubility of KBr is also increases.
So we can conclude that According to the graph, increasing the temperature of the solution will increase the solubility of KBr.
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The Mississippi River is one of the largest waterways in
the United States. It is an important water resource. How
do you think this water resource benefits the neighboring communities?
The Mississippi River is the second-longest river and chief river of the second-largest drainage system in North America, second only to the Hudson Bay.
Only the conjoining Missouri is longer than the second-longest river in the US, the Mississippi, which also supports a $12.6 billion shipping sector and 35,300 employment nationwide. It is one of the largest waterways in the world, transporting goods and food for the entire planet.
Water is a valuable resource that is used in a wide variety of ways because of its unique properties. Water is essential to all life for survival. Without fresh water, people cannot endure for longer than five to seven days.
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why do estuaries have high biodiversity? a. predators have difficulty catching prey near estuaries. b. the climate around estuaries is cold throughout the year. c. the water in estuaries is saltier than ocean water. d. the soil near estuaries is rich in nutrients.
D -The soil near estuaries is rich in nutrients, this is why estuaries have high biodiversity.
Because of the abundant food source and the efficient use of light energy by phytoplankton, which offers millions of plants and animals a tranquil haven from the open sea, estuaries have high primary output. The variety of ecosystems found inside estuaries supports a huge variety and number of organisms.
Estuaries produce a lot of primary material in part because of their physical makeup. It has a sizable surface area and more light penetrating through it.
A diversity of habitats are created in estuaries by the salinity gradient, variations in tides, freshwater, and concomitant flow in nutrients. These factors sustain a varied food web.
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For each of the following chemical formulas, indicate if the substance is ionic or covalent.
A) AgF
B) C6H12O6
C) FeCi3
D)SF6
Answer:
A) Ionic (Ag is a metal and F is a nonmetal)
B) Covalent (All elements are nonmetals)
C) Ionic (Fe is a metal and Cl is a nonmetal)
D) Covalent (All elements are nonmetals)
a patient is suspected of having low stomach acid, a condition known as hypochloridia. to determine whether the patient has this condition, her doctors take a 20.00 ml sample of her gastric juices and titrate the sample with 1.72×10−4 m koh. the gastric juice sample required 17.2 ml of the koh titrant to neutralize it. calculate the ph of the gastric juice sample. assume the sample contained no ingested food or drink which might otherwise interfere with the titration
The answer would be the pH of the gastric juice sample is 5.1
In chemistry, pH, historically denoting "eventuality of hydrogen", is a scale used to specify the acidity or stipulation of an waterless result. Acidic results are measured to have lower pH values than introductory or alkaline results.
pH is defined as the negative log base 10 of the hydronium ion.
Formula : - log ([H⁺])
Now,
Volume of KOH, V1 = 17.2mL
Volume of HCI, V2 = 20mL
Molarity of KOH, M1 = 1.72 × 10⁻⁴ × M
The given titration is between KOH and gastric juice (HCI).
The molarity of HCI can be calculated using the relation,
M1 × V1 =M2 × V2 ---------- (1)
M2 = M1 × V1 / V2
Where, M1 is the molarity of KOH.
M2 is the molarity of HCI.
V1 is the volume of KOH.
V2 is the volume of HCI.
Substituting the values in equation (1),
M2 = 1.72 × 10⁻⁴ × 17.2 / 20.00
M2 = 1.49 × 10⁻⁵ g
The pH of gastric juice (HCI) can be calculated using the equation,
pH = -log[H⁺ ] -------- (II)
Since, HCI is a strong acid, it dissociates as follows, HCI H+CI
Therefore,
[HCl]=[H⁺]=[Cl⁻ ]= 1.49 * 10⁻⁵ * M
Substituting this in equation (II),
pH =-log[H⁺] = - log[1.49 × 10⁻⁵] = - log(1.49) + 5 × log(10)
The value of pH is calculated as,
pH = - log(4.78) + 5 × log(10) = -0.17314 +5 = 5.1
Hence, pH of gastric juice is 5.1
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Which is correct for the chromium isotope?
The most common isotope of chromium contains 28 neutrons in addition to its 24 protons and 24 electrons. Chromium is a strong, shiny metal with a bluish hue under normal circumstances. Thus, option C is correct.
What is chromium isotope?There are four naturally occurring isotopes of chromium, with relative abundances of 4.35%, 83.79%, 9.50%, and 2.36% for 50Cr, 52Cr, 53Cr, and 54Cr, respectively.
Numerous Chromium isotopes are employed in medical procedures. The radioisotope Cr-51, which is used to gauge blood volume and red blood cell survival, is created from Cr-50.
Studies on (adult) diabetes and chromium metabolism both use Cr-53 and Cr-54 as research tools.
Therefore, chromium isotope contain 24 protons and 28 neutrons.
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Neon has three different isotopes. 90.51% of neon atoms have a mass of 19.992 amu 0.27% of neon atoms have a mass of 20.994 amu. 9.22% of neon atoms have a mass of 21.991 amu. What is the average atomic mass of neon?
The average atomic mass of neon will be 20.179 amu.
On adding the percentage of the mass of neon given we get,
90.51%+0.27%+9.22% = 100%
Consider masses,
M1= 19.992 amu
M2= 20.994 amu
M3= 21.991 amu
on taking them as fractions and considering them as X,Y and Z, we get,
X= 0.9051
Y= 0.0027
Z= 0.0922
Average atomic mass= X(M1)+Y(M2)+Z(M3)
= 0.9051(19.992) + 0.0027(20.994) + 0.0922(21.991)
= 18.095 + 0.0567 + 2.028
= 20.179 ≈ 20.18 amu
What does atomic mass mean?Atomic mass is the amount of matter that makes up an element's atom. It is written as a multiple of 1.992646547 1023 gram, or one-twelfth the mass of the carbon-12 atom, which is given an atomic mass of 12 units.To learn more about atomic mass visit:
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