What scientist formalized a theory of the atom that gained broad acceptance?.
Answer:
Dalton
Explanation:
Rutherford Dalton Democritus, stated that all matter was made up of small, indivisible particles known as 'atoms'.
Why is degrees used in measuring angles and temperature?.
Marcus and his brother always argue about who will walk the dog. Their father wants to find a random way of deciding who will do the job. He invented a game to help them decide. Each boy will have a bag with three colored blocks in it: one yellow, one green, and one white. Each night before dinner, each boy draws a block out of his bag. If the colors match, Marcus walks the dog. If the two colors do not match, his brother walks the dog. Marcus's father wants to be sure that the game is fair. a. Make a probability tree of all of the possible combinations of draws that Marcus and his brother could make. How many possibilities are there? b. What is the probability that the boys will draw matching blocks?
By studying the experiment, we will see that:
a) There are 9 possible outcomes (listed in the answer) all with the same probability.
b) The probability of drawing matching blocks is 1/3.
How to know if the game is fair?
The game is fair if and only if the two outcomes have the same probability.
Here the two outcomes that we care for are:
The colors match.The colors do not match.a) First, in each bag all the blocks have the same probability of being drawn, which is 1/3.
Then each combination will have the same probability, which is:
p = (1/3)*(1/3) = 1/9.
Now, the possible combinations of colors are given by the table:
Marcus Brother probability
yellow yellow 1/9
yellow green 1/9
yellow white 1/9
white yellow 1/9
white green 1/9
white white 1/9
green yellow 1/9
green green 1/9
green white 1/9
b) The probability that the boys draw matching blocks is given by the sum between the probabilities that they draw 2 yellow blocks, 2 green blocks, and 2 white blocks, this is:
P = 1/9 + 1/9 + 1/9 = 1/3.
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68.5g of C3H8 are reacted with 83.4g of O2 in the following reaction. how many grams of the excess reactant must remain unreacted
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
mole C₃H₈ = 68.5 : Mr C₃H₈ = 68.5 : 44 g/mol = 1.557
mole O₂ = 83.4 : Mr O₂ = 83.4 : 32 g/mol = 2.606
to find limiting reactants :
divide the number of moles by their respective coefficients, and the small quotient will be a limiting reactants
C₃H₈ : O₂ = 1.557/1 : 2.606/5 = 1.557 : 0.521
O₂ as a limiting reactant, C₃H₈ excess reactants
reacted mole of C₃H₈ : 1/5 x 2.606 = 0.5212
unreacted mole of C₃H₈ : 1.557 - 0.5212 = 1.0358
mass of C₃H₈ (unreacted) = 1.0358 x 44/gmol = 45.575 g
How much Mercury (II) Oxide is needed to produce 198g of Oxygen?
Answer:
The Same Of this Equetion Answer
Explanation:
First we need to convert the chemical equation that you wrote out in words into a chemical equation with compounds and coefficients. The balanced chemical equation looks like this:
2 HgO (s) --> 2 Hg (l) + O2 (g)
Now we need to convert the 55.7 g of HgO into moles of HgO. To do this, we find the molar mass of HgO. The periodic table tells us that the atomic mass of one Hg is 200.59. The periodic table also tells us that the atomic mass of one O is 15.999. Thus, the molar mass of HgO is 200.59 + 15.999 = 216.589 grams. That is, one mole of HgO = 216.589 grams of HgO.
We need to figure out how many moles are in 55.7 grams of HgO. We calculate this by doing 55.7 divided by 216.589. The calculator says that 55.7 / 216.589 = 0.25716911. So 55.7 grams of HgO is equal to 0.25716911 mole of HgO.
Now we use the coefficients in the balanced equation to convert from moles of HgO to moles of O2. The equation to convert looks like this:
moles of HgO x coefficient of O2
coefficient of HgO
In case the formatting messes up, this is moles of HgO multiplied by (coefficient of O2 / coefficient of HgO). We already know the moles of HgO (it's the 0.25716911 moles of HgO that we just calculated). The coefficients come from the balanced equation; here it is again: 2 HgO (s) --> 2 Hg (l) + O2 (g) . The coefficient of HgO is 2, and the coefficient of O2 is 1. (Remember that if there is no visible coefficient, the coefficient is 1.) If we put these numbers in the equation to convert, the equation to convert looks like this:
0.25716911 moles of HgO x 1
2
If you can't see this, we do 0.25716911 x (1/2). The calculator says that 0.25716911 x (1/2) = 0.12858455. Thus, we have 0.12858455 moles of O2. Remember that the question asks for the volume of O2. Now we need to use the ideal gas equation to find the volume of the 0.12858455 moles of O2. The ideal gas equation is:
PV = nRT
Remember that P is pressure in atm, V is the volume of the gas in liters, n is the number of moles of the gas, R is the ideal gas constant, and T is the temperature in Kelvin. So far we know that P = 1 atm (the problem gave us this information), V is what we want to find, n = 0.12858455 moles of O2, and T = 25 degrees Celsius. But we must have the temperature in Kelvin, so we convert from Celsius to Kelvin with the equation
K = C + 273.15. Since the temperature is 25 degrees Celsius, K = 25 + 273.15 = 298.15. So the temperature is 298.15 K. Finally, R = 0.082057 L*atm/(K*mol). (You can look up the value for R in a table or chart; you don't need to memorize it.) Once we put these values into the ideal gas equation, the ideal gas equation looks like this:
1*V = (0.12858455)*(0.082057)*(298.15)
Since 1*V is equal to V, we can just write V instead of 1*V. So our equation looks like this:
V = (0.12858455)*(0.082057)*(298.15)
Now we just multiply the numbers together. The calculator says that (0.12858455)*(0.082057)*(298.15) = 3.14589. Remember that the correct unit for volume is liters. Thus, the volume of O2 is 3.14589 L. We should round to 3 significant figures because the problem gave us the number 55.7 (which has 3 significant figures). If we round 3.14589 to 3 significant figures, we get 3.15. Thus, the answer is 3.15 L of O2.
Is Fahrenheit used in England for the temperature at all?.
Answer:
No, i don't believe so, Fahrenheit is one of those thinks America did like ft. and inches.
Explanation:
Which model could represent a neutral atom of oxygen?
А 1
B. 4
O O O O
o 2
Answer:
it will be b because it is the atom oxygen
Answer:D
Explanation:
I just did it.Brainlist please
A 52-kg woman has 7.2 x 10-mol of hemoglobin (molar mass =
64456 g/mol ) in
her blood. How many hemoglobin molecules is this?
There are 6.022 x 1023 molecules per mole (Avogadro's number). As there are 7.2 x 10-3 moles of hemoglobin, the number of hemoglobin molecules would be 6.022 x 1023 molecules/mole x 7.2 x 10-3 moles = 4.3 x 1021 molecules
A 52-kg woman has 7.2 x 10 mol of hemoglobin in her blood. The quantity of hemoglobin molecules is 4.3 x 10²¹ molecules.
What is hemoglobin?Red blood cells include the protein hemoglobin, which transports oxygen to your body's organs and tissues, and carbon dioxide from those tissues back to your lungs.
You have a low red blood cell count if a hemoglobin test finds that your hemoglobin level is lower than normal (anemia).
Molar mass of many compounds can be calculated by dividing the mass of the compound by the number of moles of the compound.
There are 6.022 x 1023 molecules per mole (Avogadro's number).
As there are 7.2 x 10⁻³ moles of hemoglobin, the number of hemoglobin molecules would be 6.022 x 10²³ molecules/mole x 7.2 x 10⁻³ moles = 4.3 x 1021 molecules.
Therefore, the number of hemoglobin molecules is 4.3 x 10²¹ molecules.
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2. How many moles are in 6.55 x 108 grams of H2O?
3.63x10^7 moles
Answer:
Who helped Hernán Cortés and his soldiers defeat the Aztec?
A tennis player hits a 0.1-kilogram tennis ball with her racket from the north end of a court. Her racket was traveling at 65 kilometers per hour. The ball accelerated at a rate of 10 meters per second squared. The player on the south end of the court hit the tennis ball with her racket at 75 kilometers per hour. How much force did the racket on the south end of the court exert on the ball?(1 point)
7.5 N
1 N
6.5 N
0.01 N
Answer: 1 N
Explanation: i took the test
The force exerted by the racket on the south end on the ball is 1.2 N.
What is Newton's second Law ?Newton's second law states that, force applied on an object is the rate of change of momentum of the body.
Here,
Mass of the tennis ball, m = 0.1 kg
Initial velocity of the ball, v₁ = 65 km/h = 18.06 m/s
Distance travelled by the ball, S = 23.78
Using the second equation of motion,
S = v₁t + 1/2at²
23.78 = 18.06t + 5t²
Solving the quadratic equation, we get,
t = 1.7 s
We know,
F = ΔP
F = mv₂ /t
F = 0.1 x 20.83/1.7
F = 1.2 N
Hence,
The force exerted by the racket on the south end on the ball is 1.2 N.
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A solution has a pH of 4. 20. Using the relationship between pH and pOH, what is the concentration of OH−? A. 9. 9 × 10-1 M B. 6. 2 × 10-1 M C. 6. 3 × 10-5 M D. 6. 7 × 10-6 M E. 1. 6 × 10-10 M.
1.6 x 10⁻¹⁰ M is the concentration of OH− ion of the solution has a pH of 4.20.
How we calculate the pH of any solution?pH of any solution is define as the negative logarithm of the concentration of hydrogen ions i.e. pH = -log[H⁺].
Equation of pH will be written in the form of base 10 by removing the log as:
[H⁺] = [tex]10^{-pH}[/tex]
Given value of pH is 4.20 and concentration of H⁺ ions will be calculated as:
[H⁺] = 10⁻⁴°²⁰
[H⁺] = 6.3 × 10⁻⁵
Now the relation between pH & pOH in term of base 10 is:
[H⁺][OH⁻] = 10⁻¹⁴
[OH⁻] = 10⁻¹⁴ / [H⁺]
[OH⁻] = 10⁻¹⁴ / 6.3 × 10⁻⁵ = 1.6 x 10⁻¹⁰ M
Hence, option (E) is correct i.e. 1.6 x 10⁻¹⁰ M.
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please help me get the answer to bothe a and b
Answer:
If a metal and metal solution react, the more reactive metal will displace the less reactive metal from solution. If the metal in solution you start with is formed from a more reactive metal than the metal to be added, no reaction will occur.
The primary goal of water-softening ion exchange systems is
…
A) removing magnesium and calcium from water.
B) introducing sodium into water.
C) removing sodium from water.
D) introducing magnesium and calcium into water.
The primary goal of water-softening ion exchange systems is to remove calcium and magnesium from water.
Water-softeningWater-softening process involves ion exchange system, this process removes the chemical elements that makes water hard
The purpose of this ion exchange is to reduce calcium and magnesium content of hard water.
Thus, the primary goal of water-softening ion exchange systems is to remove calcium and magnesium from water.
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Designing a Chemical System Quick Check
1. removing magnesium and calcium from water.
2. Untreated water is subjected to high pressure, causing it to move through a semi-permeable membrane, which captures contaminants.
3. An ion exchange system would likely be chosen because it does not require specialized maintenance or regular replacement of components.
4. They are likely to choose reverse osmosis because it addresses a wider range of problems, including bacteria.
5. This treatment removes bacteria, but not other pollutants.
Which statement correctly describes what happens to Li and Cl atoms when they bond? a . Li loses 1 valence electron and becomes a negative ion, Cl gains 1 valence electron and becomes a positive ion . b. loses 1 valence electron and becomes a positive ion, gains 1 valence electron and becomes a negative ion. . Li gains 1 valence electron and becomes a negative ion, loses 1 valence electron and becomes a positive ion. d . Li gains 1 valence electron and becomes a positive ion, loses 1 valence electron and becomes a negative ion.
Taking into account the definition of ionic bond, Li loses 1 valence electron and becomes a positive ion and Cl gains 1 valence electron and becomes a negative ion.
Definition of ionic bondAn ionic bond is a type of chemical bond that occurs when one atom gives up an electron to the other, in order for both to achieve electronic stability.
This union normally occurs between metal and nonmetal elements with different electronegativity, which means that the elements have different capacity to attract electrons.
In other words, an ionic bond is produced between metallic and non-metallic atoms, where electrons are completely transferred from one atom to another. During this process, one atom loses electrons and another one gains them, forming ions. Usually, the metal gives up its electrons forming a cation to the nonmetal element, which forms an anion.
Bond between Li and ClLi is a metal, while Cl is a nonmetal. Considering the definition of ionic bond, the Li gives up its electrons forming a cation to the Cl, which forms an anion.
In summary, Li loses 1 valence electron and becomes a positive ion and Cl gains 1 valence electron and becomes a negative ion.
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A mutation is a change in the DNA base sequence. What effect would this have on a protein?
Answer:
Consequently, once it encounters the mutation, the ribosome will read the mRNA sequence differently, which can result in the production of an entirely different sequence of amino acids in the growing polypeptide chain.
Explanation:
Answer:
A missense mutation is when the change of a single base pair causes the substitution of a different amino acid in the resulting protein. This amino acid substitution may have no effect, or it may render the protein nonfunctional.
Whạt visible indication is there that a chemical reaction is occurring
Answer:
color change, formation of a precipitate, formation of a gas, odor change, temperature change.
What other aspects of a catalyzed reaction are different from the uncatalyzed reaction?.
Answer:
less activation energy
I will give BRAINLIEST. 1. A spiderweb and a Kevlar jacket have some obvious differences. Which property is similar between the web and the jacket?
- surface area
- thickness, expressed as a number of atoms
- overall strength
- arrangement of atoms in molecules
2. Assuming silk from spiderwebs could be made just as strong as Kevlar, why would a company still choose to use Kevlar in producing bulletproof fabrics?
- A much larger amount of silk might be needed to produce the same effect.
- Spiderweb silk would likely be rejected by the body.
- The cost might be higher for producing spiderweb silk.
- Spiderweb silk likely involves more chemicals.
3. Which microscopic detail affects the strength of different forms of silk?
- Different silk strands are made with different types of atoms.
- Different types of silk are in long strands or in other very different arrangements.
- Different silk strands have different combinations of amino acids.
- Different types of silk do not have the same strength if they come from different sources.
4. Which type silk is the strongest?
- nonbiodegradable
- minor ampullate
- major ampullate
- biodegradable
5. Which natural source has been bioengineered to make silk proteins?
- mulberry leaves
- goat milk
- goat hair
- mulberry bark
Answer:
.arrangement of atoms in molecules.A much larger amount of silk might be needed to produce the same effect.- Different silk strands have different combinations of amino acids. .major ampullate.goat milkWhen boiling water, is it best to use cold or hot water?.
Answer:
Use cold water instead of hot for cooking: hot water will contain more dissolved minerals from your pipes, which can give your food an off-flavor, particularly if you reduce the water a lot. Water that's been frozen or previously boiled will boil faster.
Explanation:
For the balanced equation shown below, how many moles of CO2 will react with 0.708 moles of H2O.
3CO2 + 4H2O --> C3H8 + 5O2
** im pretty sure it needs to be rounded to the tenth
Answer:
0.5 moles of CO2 will react with 0.708 moles of H2O.
Explanation:
[tex]\sf balanced \ equation = 3CO2 + 4H2O \rightarrow C3H8 + 5O2[/tex]
0.708 moles of H2Ousing molar ratio:
4H2O : 3CO2
4 : 3
so H2O moles:
[tex]\sf\dfrac{0.708}{4} *3[/tex]
[tex]\sf 0.531[/tex] moles of CO2
Which of the following statements about recycling electronic waste is true?
Exporting electronic waste is part of a safe recycling process.
Electronic waste is recycled using the same process as plastic and metal.
Over 60 percent of electronics waste worldwide is recycled safely.
Minerals can be extracted from recycled electronics.
Answer:
minerals can be extracted from recycled electronics
Explanation:
The which is true about electronic waste is minerals can be extracted from recycled electronics.
What is electronic waste?The waste which are the residue of the electrical devices which we used in our daily life is known as electronic waste.
In the electrical devices many metals and non metals are present and when we recycle this electrical waste then again we get that useful materials from the waste in the form of minerals, because all that metals, non metals or any other element will get in combined form.
Hence, option (d) is correct.
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A 150 mL sample of hydrochloric acid (HCl) completely reacted with 60. 0 mL of a 0. 100 M NaOH solution. The equation for the reaction is given below. HCl NaOH Right arrow. NaCl H2O What was the original concentration of the HCl solution? 0. 040 M 0. 25 M 1. 50 M 2. 50 M.
Answer:
The balanced chemical reaction is expressed as:
HCl + NaOH ---> NaCl + H2O
We are given the amount and the concentration of the sodium hydroxide reactant. This will be the starting point for the calculations.
0.100 mol NaOH/L solution (0.06 L solution) ( 1 mol HCl / 1 mol NaOH) = 0.006 mol HCl
Molarity = amount in moles / Volume of solution = 0.006 mol HCl/ 0.150 L
Molarity = 0.04 M
Explanation:
Help me please( ╹▽╹ )
Lower temperature
Let's verify
Pressure=Pvolume=VTemperature=TAs per Boyles law
[tex]\\ \rm\Rrightarrow V\propto \dfrac{1}{P}[/tex]
As per Charles law
[tex]\\ \rm\Rrightarrow V\propto T[/tex]
[tex]\\ \rm\Rrightarrow T\propto \dfrac{1}{P}[/tex]
So
At higher altitudes lower the pressure so lower the temperature
what are the three rules of thermodynamics?
According to this law, some heat given to the system is used to change the internal energy while the rest is used in doing work by the system.
This relationship is mathematically represented as follows:
ΔQ = ΔU + W
where ΔQ is the heat given or lost, ΔU is the change in internal energy and W is the work done.
The second law of thermodynamics :If a room is not tidied or cleaned, it invariably becomes more messy and disorderly with time.
When the room is cleaned its entropy decreases but the effort to clean it has resulted in an increase in entropy outside the room that exceeds the entropy lost.
The Third law of thermodynamics :The entropy of a pure crystalline substance (perfect order) at absolute zero temperature is zero. This statement holds true if the perfect crystal has only one state with minimum energy.
What is the difference between heterochromatin and euchromatin.
Answer:
The main difference between the two is euchromatin is genetically active while heterochromatin is genetically inactive
Answer:
Heterochromatin is the part of the chromosome without DNA coding genes and Euchromatin is the part of the chromosome with coding genes.
Explanation:
Euchormatin is the part of the chromosome which is rich with gene concentration and participates in the transition process. Heterochromatin is th area with a darkly stained DNA specific strand and is a condensed state.
A student is extracting caffeine from water with dichloromethane. The K value is 4.2. If the student starts with a total of 30 mg of caffeine in 2 mL of water and extracts twice with 2 mL of dichloromethane, how much caffeine will be in the dichloromethane extract
Answer:
787.5 is a transversal of lines I and m that forms 8 angles and the other way around the world health organization and the other one is a transversal of lines I and m that forms 8 angles and the other things that you can see in the picture of with the first term 8 and a common ratio of the following values would be a little different to the one you have the
What two processes are necessary to make oil quizziz.
Answer: organic matter and salt water. heat and pressure. erosion and deposition.
Explanation: Hope this helps ;)
Sodium metal reacts with aqueous magnesium sulfate to form sodium sulfate solution and
magnesium metal
Answer:
Na(s) + MgSO4(aq) -> Na2SO4(aq) + Mg(s)
Explanation:
Sodium metal reacts easily with magnesium sulfate to form sodium sulfate solution and magnesium metal as per the equation written below:
[tex]\rm 2Na + MgSO_{4} \rightarrow Na_{2}SO_{4} + Mg[/tex].
What is magnesium sulphate?Magnesium sulphate is an inorganic salt formed by magnesium metal and other sulphate compounds. The valency of both magnesium and sulphate group is 2.
Magnesium metal donates two electrons to the sulphate group and forms compound MgSO₄. When magnesium sulphate reacts with sodium metal the sulphate group is replaced into the sodium metal thus it is an example of displacement reaction.
The valency of sodium is one and hence two moles of sodium metal reacts with one mole of magnesium sulphate and the balanced reaction is written as follows:
[tex]\rm 2Na + MgSO_{4} \rightarrow Na_{2}SO_{4} + Mg[/tex].
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why is it suggested to use soap to a person suffering from bee or ant bite?
Because the ant bite or bee bite contains acid which gets neutralized by the base in the soap.
Thanks Hope it helpsWhat is the difference between a solvent molecule and a non polar solvent?
Answer:
Polar molecules occur when there is an electronegativity difference between the bonded atoms. Nonpolar molecules occur when electrons are shared equal between atoms of a diatomic molecule or when polar bonds in a larger molecule cancel each other out. Polar solvents have large dipole moments (aka “partial charges”); they contain bonds between atoms with very different electronegativities, such as oxygen and hydrogen. Non polar solvents contain bonds between atoms with similar electronegativities, such as carbon and hydrogen (think hydrocarbons, such as gasoline).
Hope this helps, please let me know If I'm wrong.
