Answer:
Explanation:
1 ) D)5,000,000
Compared to the chemical oxidation of one atom of carbon, a nuclear fission reaction using one atom of uranium can yield about 5000000____ times the energy output.
Energy in fission reaction comes from the conversion of mass into energy . This process results into creation of enormous amount of energy . But in the oxidation reaction of carbon , bonds are broken and new bonds are formed in which energy is used and released . The net energy released is difference of energy evolved minus energy used up . This difference is not much . Hence in such chemical reaction , energy released is not much .
2 ) B)The mass number is just an estimated mass measurement that is not precise.
In such calculation , the mass number used is just an estimated mass number and not the precise mass of particles involved . Hence , due to lack of precision in calculation , mass number appears to be constant . But actually there is decrease in mass in both fission and fusion reaction .
3 ) D
In fission reaction , large atomic nuclei splits into smaller nuclei to attain stability .
Question: Which is the best analogy for classification? A.Classification is like setting up a phone tree in which one person calls the next two people, and those people call the next four people. B.Classification is like creating an alphabetized list of people based on their last names. C.Classification is like organizing a car wash where everyone brings needed items and then works. D.Classification is like organizing a closet by hanging clothes together based on their type, color, and season. *15 points cuz i'm low on points oof* *science NOT chemistry*
Answer:
The last one
Explanation:
When we are classifying we try to distinguish between the type, the properties just like clothes
In Act V, scene ii of Romeo and Juliet, what role does Friar John play in the catastrophe?
He creates a quarantine, which impacts Romeo.
He secretly performs Romeo and Juliet's wedding.
He mistakenly tells Balthasar that Juliet is dead.
He fails to deliver an important letter to Romeo.
Answer:
I believe its the 4th one. He goes to give Romeo the message but before he is able to, Balthasar tells Romeo that Juliet is dead. Friar John just wasn't there in time.
Answer:
D) he fails to give Romeo an important letter
Explanation:
i took the test. edge 2020
The density of a gaseous chlorofluorocarbon (CFC) at 23.8 °C and 432 mmHg is 3.23 g/L. What is its molar mass?
Answer:
138.57 g/mol.
Explanation:
The following data were obtained from the question:
Temperature (T) = 23.8 °C
Pressure = 432 mmHg
Density (D) = 3.23 g/L
Next, we shall obtain an expression for the density in relation to molar mass, pressure and temperature.
This can be obtained by using the ideal gas equation as shown below:
PV = nRT.... (1)
Recall:
Mole (n) = maas(m) /Molar mass (M)
n = m/M
Substituting the value of n into equation 1
PV = nRT
PV = mRT/M
Divide both side by P
V = mRT/MP
Divide both side by m
V/m = RT/MP
Invert the above equation
m/V = MP /RT..... (2)
Recall:
Density (D) = mass(m) /volume (V)
D = m/V
Replace m/V with D in equation 2
m/V = MP /RT
D = MP /RT
Thus, with the above formula we can obtain the molar mass of chlorofluorocarbon (CFC) as shown below:
Temperature (T) = 23.8 °C = 23.8 °C + 273 = 296.8 K
Pressure = 432 mmHg = 432/760 = 0.568 atm
Density (D) = 3.23 g/L
Gas constant (R) = 0.0821 atm.L/Kmol
Molar mass (M) =..?
D = MP /RT
3.23 = M x 0.568 / 0.0821 x 296.8
Cross multiply
M x 0.568 = 3.23 x 0.0821 x 296.8
Divide both side by 0.568
M = (3.23 x 0.0821 x 296.8) / 0.568
M = 138.57 g/mol
Therefore the molar mass of CFC is 138.57 g/mol.
10. Write the word equation of the following skeleton equation.
CuCl(aq) + NaOH(aq) → Cu(OH),(s) + NaCl(aq)
Indicate the state of each substance in your word equation.
Someone help me out please
Answer:
See below.
Explanation:
Aqueous copper chloride reacts with sodium hydroxide aqueous solution to give a precipitate (solid) of copper hydroxide and aqueous sodium chloride.
According to the law of conservation of energy, what will most likely happen in a closed system?
O Energy will be exchanged along with matter.
Energy will be exchanged, but matter will not be exchanged.
Energy will be created along with matter.
Energy will be destroyed, but matter will not be destroyed.
Answer:
the answer is Energy will be exchanged, but matter will not be exchanged.
this because that in a closed system energy is able to be transfered but matter cant.
hope this helps
Answer:
b
Explanation:
none
what is the name of this compound??
Canthomythisphere
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Which example is a long-term environmental change? La Niña El Niño climate change small asteroid impact
The correct answer is C. Climate change
Explanation:
Long-term environmental changes occur as major events affect the environment and ecosystems indefinitely. These events differ from short-term environmental changes because the effect of short-term environmental changes is mainly temporary. Also, long-term changes are usually gradual.
Climate change is an example of long-term environmental changes because this implies indefinite and major changes in weather patterns and ecosystems. For example, it is believed climate change will decrease the amount of ice in Earth, change sea level, and lead to the extinction of dozens of species. This does not occur with events such as el niño or a small asteroid impact that affect the environment for a short time and do not imply major changes.
Answer:
it is c) climate change
Explanation:
i just took the quiz
hope this helps!!! :D
A syringe contains 610 mL of CO at 310 K and 1.5 atm pressure. A second syringe contains 520 mL of N2 at 325 K and 3.5 atm. What is the final pressure if the contents of these two syringes are injected into 2.00 L container at 10.0C
Answer:
P = 1.21atm
Explanation:
Using PV = nRT, moles of both syringes is:
Moles CO:
n = PV / RT
n = 1.5atm*0.610L / 0.082atmL/molK*310K
n = 0.0360 moles
Moles N₂:
n = PV / RT
n = 3.5atm*0.520L / 0.082atmL/molK*325K
n = 0.0683 moles.
As in the container you mix both gases, moles in the container are:
n = 0.0360 + 0.0683 = 0.1043 moles
Conditions of the container are:
V = 2.00L; T = 273.15K + 10°C = 283.15K; n = 0.1043 moles.
Thus, pressure is:
P = nRT / V
P = 0.1043mol*0.082atmL/molK*283.15K / 2.00L
P = 1.21atmHow many significant digits will the answer in the following calculations result in?
12.1 - 12.004
Answer:
The answer will result in one significant digit.
Explanation:
1. Subtract:
12.1 - 12.004 = 0.096
2. ROund to the correct number of significant digits:
For addition and subtraction we round the sum or the difference to the least number of digits after the decimal point there are in the problem.
For example, SInce 12.1 has one number after the decimal point and 12.004 has three numbers after the decimal point, we round the answer to one number after the decimal point because 12.1 is the number in the problem which has the least amount of digits after the decimal point.
We round 0.096 to 0.1.
0.1 has one significant digit.
hurry please! avogadro's law relates the volume of a gas to the number of moles of gas when temperature and pressure are constant. according to this law, how many moles of gaseous product would be produced by 2 moles of gaseous reactants if the volume of the gases doubled?
Answer:
Option B. 4 moles of the gaseous product
Explanation:
Data obtained from the question include:
Initial volume (V1) = V
Initial number of mole (n1) = 2 moles
Final volume (V2) = 2V
Final number of mole (n2) =..?
Applying the Avogadro's law equation, we can obtain the number of mole of the gaseous product as follow:
V1/n1 = V2/n2
V/2 = 2V/n2
Cross multiply
V x n2 = 2 x 2V
Divide both side by V
n2 = (2 x 2V)/V
n2 = 2 x 2
n2 = 4 moles
Therefore, 4 moles of the gaseous product were produced.
skeleton equation for
when magnesium oxide reacts with iron, iron(III) oxide and magnesium is formed
Answer:
Magnesium oxide = MgO
Iron = Fe
Iron (III) Oxide = Fe₂O₃
Magnesium = Mg
Skeleton equation = MgO + Fe ⇒ Fe₂O₃ + Mg
If the haploid number of an organism is 32 how many pairs of chromosomes would be found in each of the cells of the adult organism
Answer:
32 pairs
Explanation:
Haploid number is half of the original number (diploid) of chromosomes in somatic cells. So, if the haploid number is 32, the diploid number will be 32x2= 64.
But since 2 chromosomes pair up to form a homologous chromosome pair, the number of pairs of chromosomes found will be 32.
If the haploid number of an organism is 32, then the pairs of chromosomes that would be found in each of the cells of the adult organism is 32. The correct option is C.
What is haploid organism?The presence of a single set of chromosomes in an organism's cells is referred to as haploidy.
Diploid organisms reproduce (having two sets of chromosomes, one from each parent). Only the egg and sperm cells in humans are haploid.
Humans are diploid, with 23 chromosome pairs in the majority of cells. Human gametes (egg and sperm cells) have a single set of chromosomes and are thus haploid.
If an organism's haploid number is 32, then the number of pairs of chromosomes found in each cell of the adult organism is 32. This simply means that in pair there will 64 chromosomes, means 32 pair.
Thus, the correct option is C.
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Using the balanced equation below, how many grams of iron(iii) oxide would be required to make 187g iron Fe2O3+3CO = 2Fe+3CO2
Answer:
267.14 iron oxide.
Explanation:
Given that
[tex]Fe_2O_3+3CO = 2Fe+3CO_2[/tex]
We know that molecular mass of iron-oxide = 160 g/mole.
We know that molecular mass of iron = 56 g/mole.
From the above reaction we can say that
1 mole of iron -oxide produce 2 mole of iron
160 gm of iron oxide produce 112 gm of iron
So
1 gm of iron required [tex]\dfrac{160}{112}=1.42 gm[/tex] of iron oxide
Therefore
187 gm of iron required [tex]1.42\times = 187 = 267.14\ gm[/tex] of iron oxide.
Therefore 187 gm of iron required 267.14 iron oxide.
Answer: 267.14
Explanation:
Which is a negative effect of deforestation on the environment? habitat restoration, desertification, soil production, or urbanization
Answer:
The correct option is desertification
Explanation:
Deforestation is the deliberate act of pulling down trees to provide a clear land for space or to make use of the trees for other purposes such as grazing, farming, timber fire wood, building and constructions, urban utilization, access roads, expansion, development of infrastructures, grazing of cattle and mining
The effects of deforestation includes climate change, flooding, increase in the proportion of green house gases in the atmosphere, soil erosion and desertification.
A negative effect of deforestation is desertification.
Deforestation refers to the cutting down of trees. There are many reasons why people may cut down trees. One of the popular reasons why people cut down trees is to obtain timber which is used for construction and as fuel.
An important consequence of the felling of trees also called deforestation is that a once fertile land may gradually be turned into a desert area. This is known as desertification.
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What is the best definition of chemistry?
A. The study of mass, energy, and light
B. The study of life and energy
C. The study of experiments and theories
D. The study of matter, its properties, and its reactions
Which objects will most likely float
Which is NOT a control in the following experiment?: An experiment was performed to determine how the amount of coffee grounds could affect the taste of coffee. The same kind of coffee, the same coffee maker, the same amount and type of water, and the same electrical sources were used. While experimenting, the scientists notes that the more coffee grounds there were, the longer it took to brew.
Answer:
The same kind of coffee, the same coffee maker, the same amount and type of water, and the same electrical sources were used.
Explanation:
E ) The distribution coefficient , Ko ( Cether / C water ) , for an organic substance X at room temperature is 13. What relative volume of ether to water should be used for the extraction of 94 percent of X from a water solution in single extraction ?
Answer:
Relative volume of ether to water that should be used for the extraction = 1.205
Explanation:
The extraction/distribution coefficient of an arbitrary solvent to water for a given substance is expressed as the mass concentration of the substance in the arbitrary solvent (C₁) divided by the mass concentration of the substance in water (C₂).
K = (C₁/C₂)
Let the initial mass of the organic substance X in water be 1 g (it could be any mass basically, it is just to select a right basis, since we are basically working with percentages here).
If 94% of the organic substance X is extracted by ether in a single extraction, 0.94 g ends up in ether and 0.06 g of the organic substance X that remains in water.
Let the volume of ether required be x mL.
Let the volume of water required be y mL.
Relative volume of ether to water that should be used for the extraction = (x/y)
Mass concentration of the organic substance X in ether = (0.94/x)
Mass concentration of organic substance X in water = (0.06/y)
The distribution coefficient , Ko (Cether / C water), for an organic substance X at room temperature is 13.
13 = (0.94/x) ÷ (0.06/y)
13 = (0.94/x) × (y/0.06)
13 = (15.667y/x)
(x/y) = (15.667/13) = 1.205
Hope this Helps!!!
Select the correct answer.
Which of the following is a physical model of the Sun?
A.
an equation that describes the Sun's motion
В.
a chart that lists the temperatures of different parts of the Sun
C.
a computer program that shows how the Sun changes over time
D
a paragraph that describes the Sun's structure
E.
a small yellow ball that represents the Sun
Answer: E
Explanation: The ball is yellow so it can easily represent the sun
The image is of the formation of a fault-block mountain.
Which of these most likely occurs to result in the
formation of these mountains?
O The crust is compressed
O The crust does not spread apart
The center block is forced upward.
The hanging walls from the two parallel faults slip down
Answer:
d.
Explanation:
The Formation of these mountains will be caused by
The crust does not spread apartThe center block is forced upward.The hanging walls from the two parallel faults slip downOptions B, C, and D is correct.
What are mountains?Generally, a mountain is simply defined as a body that rises dramatically above its surroundings and is distinguished by steep slopes.
In conclusion, Mountains are formed from the formation of rocks over years in an Environment.
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Calculate the mass of 2.50 mol of CH,OH(1). Show your work. Use the appropriate
number of significant digits in your final answer.
Help please
Answer:
80.1 grams
Explanation:
Find the molar mass of CH3OH first by using the periodic table values.
12.011 g/mol C + (1.008*3 g/mol H) + 15.999g/mol O + 1.008 g/mol H
=32.042 so that is the molar mass
Now that you have 2.50 moles of CH3OH, you can calculate the mass in g
2.50molCH3OH * (32.042g CH3OH / 1 mol CH3OH) = 80.105
32.042g / 1 mol is the same as 32.042 g/mol
Since there are 3 sig figs in the problem (2.50 has 3 sig figs), you round to 80.1 g CH3OH
Hg(OH)2 + H3PO4 = Hg3(PO4)2 + H2O
Answer:
3Hg(OH)2 + 2H3PO4 → Hg3(PO4)2 + 6H2O
An aqueous solution of glucose (MM = 180.2 g/mol) has a molality of 2.27 m and a density of 1.20 g/mL. What is the molarity of glucose in the solution?
**Any help would be greatly appreciated!**
Answer:
Molarity of the glucose solution = 2.72 mol/L
Explanation:
Molality of a solution is defined as the number of moles of solute per kilogram of solvent.
Therefore , a 2.27 molal solution of glucose contains 2.27 moles of glucose in 1 Kg of solvent
Density of solution = 1.20 g/mL
The volume occupied by 1 Kg or 1000 g solution = mass/density
Volume of 1000 g solution = 1000 g/1.20 g/ml = 833.3 mL
Number of moles of glucose present in the solution = 2.27 moles
Molarity = number of moles / volume(L)
volume of solution in litres = 883.3/1000 = 0.8333 L
Molarity = 2.27 moles /0.8333 l = 2.72 mol/L
Therefore, molarity of the glucose solution = 2.72 mol/L
The molarity of the glucose in the solution has been 2.72 mol/L.
Molality can be defined as the moles of the solute per kg of solvent.
The molality of glucose solution = 2.27 m
2.27 moles of glucose in 1000 grams of water.
Density has been the mass per unit volume. The density can be expressed as:
Density = [tex]\rm \dfrac{Mass}{Volume}[/tex]
The density of the given glucose solution = 1.20 g/ml
The volume of 1000 grams of water has been:
Volume = [tex]\rm \dfrac{Mass}{Density}[/tex]
Volume of 1000 grams water = [tex]\rm \dfrac{1000\;g}{1.20\;g/ml}[/tex]
Volume of 1000 g water = 833.3 ml
The molarity can be defined as the mass of solute per liter of the solution.
Molarity = [tex]\rm moles\;\times\;\dfrac{1000}{Volume\;(ml)}[/tex] ......(i)
The moles of glucose in the 833.3 ml solution have been 2.27 mol.
Substituting the values in equation (i):
Molarity = 2.27 mol [tex]\rm \times\;\dfrac{1000}{833.3\;ml}[/tex]
Molarity = 2.72 mol/L.
The molarity of the glucose in the solution has been 2.72 mol/L.
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Which statement describes the role of a mitochondrion in providing a body with energy? It stores glucose that is taken from food so that respiration can happen later. It combines blood and oxygen so that energy can be released from glucose. It is the site where oxygen combines with small molecules and releases large amounts of energy. It is the site where food is broken down into small molecules and amounts of energy .
Answer:
It is the site where oxygen combines with small molecules of glucose and releases large amounts of energy
Explanation:
Will knows that the gravitational pull of Mars is less than the gravitational pull of Earth. When he lands on Mars, his mass will be
Answer:
i think it will "Equal to 75 Kg"
Explanation:
object/person remains same, his mass is somewhere, so it would remain same everywhere. Only Weight of a person changes with gravity
hope i helped
-lvr
Valency of Chlorine is 1. Why?
Answer:
Valency of Chlorine is 1 because it needs 1 electron to complete its octet (a shell of eight electrons). Valency is defined as "The combining power of an element" and Since, chlorine needs 1 electron to complete its valence shell, Its valency is 1.
5. How many atoms and molecules of sulphur are present in 64.0 g of sulphur (S 8 )?
Answer:
There are [tex]1.202\times 10^{24}[/tex] atoms and [tex]1.502\times 10^{23}[/tex] molecules in the compound.
Explanation:
The molar mass of the sulphur is [tex]32.065\,\frac{g}{mol}[/tex]. The Avogradro's Law states that exists [tex]6.022\times 10^{23}\,\frac{atom}{mol}[/tex]. The quantity of atoms in a quantity of mass is derived from dividing the mass by the molar mass and multiplying it by the Avogadro's Number. That is:
[tex]n_{atom} = m_{S}\cdot \frac{n_{A}}{M_{S}}[/tex]
Where:
[tex]m_{S}[/tex] - Mass of the sample, measured in grams.
[tex]n_{A}[/tex] - Avogadro's Number, measured in atoms per mole.
[tex]M_{S}[/tex] - Molar mass of the sulphur, measured in grams per mole.
If [tex]m_{S} = 64\,g[/tex], [tex]n_{A} = 6.022\times 10^{23}\,\frac{atoms}{mol}[/tex] and [tex]M_{S} = 32.065\,\frac{g}{mol}[/tex], then:
[tex]n_{atom} = (64\,g)\cdot \left(\frac{6.022\times 10^{23}\,\frac{atoms}{mol} }{32.065\,\frac{g}{mol} }\right)[/tex]
[tex]n_{atom} = 1.202\times 10^{24}\,atoms[/tex]
There are [tex]1.202\times 10^{24}[/tex] atoms in the compound.
Now, the molecular weight of the compound is:
[tex]M_{S_{8}} = 8\cdot \left(32.065\,\frac{g}{mol} \right)[/tex]
[tex]M_{S_{8}} = 256.52\,\frac{g}{mol}[/tex]
The quantity of molecules in a quantity of mass is derived from dividing the mass by the molecular weight and multiplying it by the Avogadro's Number. That is:
[tex]n_{molecule} = m_{S_{8}}\cdot \frac{n_{A}}{M_{S_{8}}}[/tex]
Where:
[tex]m_{S_{8}}[/tex] - Mass of the sample, measured in grams.
[tex]n_{A}[/tex] - Avogadro's Number, measured in atoms per mole.
[tex]M_{S_{8}}[/tex] - Molecular weight of the compound (octosulphur), measured in grams per mole.
If [tex]m_{S_{8}} = 64\,g[/tex], [tex]n_{A} = 6.022\times 10^{23}\,\frac{molecules}{mol}[/tex] and [tex]M_{S_{8}} = 256.52\,\frac{g}{mol}[/tex], then:
[tex]n_{molecule} = (64\,g)\cdot \left(\frac{6.022\times 10^{23}\,\frac{molecules}{mol} }{256.52\,\frac{g}{mol} }\right)[/tex]
[tex]n_{molecule} = 1.502\times 10^{23}\,molecules[/tex]
There are [tex]1.502\times 10^{23}[/tex] molecules in the compound.
If a sample of Fe2S3 contains 1.25x10ˣ15 iron atoms what is the mass in grams?
Answer:
mass = 0.00000043189g
What is chemical potential energy?
Answer:
Chemical potential energy is the energy stored in the chemical bonds of a substance.
Explanation:
Propane (C3H8) reacts with oxygen (O2) during a combustion reaction, producing carbon dioxide
(CO2) and water (H2O).
Which equation demonstrates the law of conservation of matter for this reaction?
Answer:
C3H8 + 5 O2 ------> 3 CO2 + 4 H2O
Explanation: