Answer:
The mass of ammonia (NH3) that contains [tex]1.00 \times 10^12[/tex] hydrogen atoms is [tex]9.4\times 10^{-12}[/tex] g.
Explanation:
As [tex]6.022\times 10^{23}[/tex] atoms of hydrogen = 1 mole of the hydrogen atom
Therefore, [tex]10^{12}[/tex] atoms of hydrogen [tex]= \frac{1}{6.022 \times 10^{23}}\times 10^{12}=1.66\times 10^{-12}[/tex] moles of the hydrogen atom.
Now, there are 3 moles of hydrogen atoms in 1 mole of ammonia [tex](NH_3)[/tex].
As the mass of 1 mole of ammonia is 17g, so
when there are 3 moles of hydrogen atoms, then the mass of ammonia = 17 g
Therefore, when there are [tex]1.66\times 10^{-12}[/tex] moles of hydrogen atoms, then the mass of ammonia [tex]= \frac{17}{3}\times 1.66\times 10^{-12}=9.4\times 10^{-12[/tex] g.
Hence, the mass of ammonia [tex](NH_3)[/tex] that contains [tex]1.00 \times 10^12[/tex] hydrogen atoms is [tex]9.4\times 10^{-12}[/tex] g.
3. A student mixes a solid powder into a beaker of fluid. Which of the following would indicate that a chemical change has definitely occurred?
Explanation:
A chemical change is a change in which a new kind of substance is produced. Such changes are always accompanied by energy changes.
They are mostly reversible.
Some examples of such reactions are combustion, rusting of iron, precipitation, rancidity of butter, souring of milk.
There might be some little change in mass It requires a considerable amount of energyNeed help please....
Methanol has a normal boiling point of 64.6C and a heat of vaporization of 35.2 kJ/mol. What is the vapor pressure (in Torr) of methanol at 12.0C
Answer:
vapor pressure of methanol at 12.0C = 75.09 torr
Explanation:
Using Clausius Clapeyron equation
, we have that
ln (P2/P1)= (ΔHvap /R) (1/T1 - 1/T2)
Given
At Normal boiling point,
Temperature T1= 64.6°C = 64.6 + 273 = 337.6 K, Pressure,P1 = 1 atm
Heat of vaporization = 35.2 kJ/mol
Changing to J/mol
=35.2 x 1000= 35200 J/mol
Temperature , T2 = 12.0oC = 12 + 273 = 285 K
Using gas constant, R = 8.314 J/mol.K
ln (P2/P1)= -(ΔHvap /R) (1/T1 - 1/T2)
ln (P2/ 1 atm) = (35200 J/mol/ (8.314 J/mol.K) X( 1/337.6 - 1/285)
ln (P2/ 1 atm) =4,233.822 X (0.00296-0.003508)
ln (P2/ 1 atm) = 4,233.822468 x-0.0005466866
ln (P2/ 1 atm)= -2.31457
P2 = e^⁻2.31457 x 1 atm
P2=0.098808atm
= 0.098808atm x760 = 75.09 torr
The mitochondrial form of the PEPCK enzyme, with oxaloacetate as substrate, is a(n)__________enzyme for the Citric Acid Cycle
(a) inhibitory
(b) activatory
(c) anapleurotic
(d) catapleurotic
Answer:
(d) catapleurotic
Explanation:
Phosphoenolpyruvate carbokinase (PEPCK) is usually used in the conversion of oxaloacetate to phosphoenolpyruvate (an important intermediate in glycolysis and gluconeogenesis, C₃H₅O₆P). The main function of this catapleurotic enzymes is in the catalysis of the forward conversion of oxaloacetate to phosphoenolpyruvate.
Determine the overall orders of the reactions to which the following rate laws apply:
(a) Rate = K[NO2]
(b) Rate = K[H2][Br2]^1/2
(c) Rate = K
Answer:
How do you determine the overall order of a reaction?
The overall order of the reaction is found by adding up the individual orders. For example, if the reaction is first order with respect to both A and B (a = 1 and b = 1), the overall order is 2. We call this an overall second order reaction.
Explanation:
which letters of an air mass represents moisture content
Answer:
Explanation:
One that forms over the Indian Ocean is called a maritime tropical air mass and is warm and humid. Air masses are classified on weather maps using two or three letters. A lowercase letter describes the amount of moisture in the air mass: m for maritime (moist) and c for continental (dry).
The letter 'c' of an air mass represents moisture content.
What is an air mass?An air mass can be described as a volume of air defined by its humidity and temperature. Air masses are classified depending on latitude and their continental or maritime source regions. Warmer air masses are deemed tropical while Colder air masses are termed polar or arctic.
The maritime and monsoon air masses are moist while Continental and superior air masses are dry. When an air mass will move away from its source region, water bodies and underlying vegetation can quickly modify its character.
The first letter "c" represents its moisture properties in continental air masses (dry) while "m" represents maritime air masses. The letter "T" stands for Tropical, "A" stands for Arctic or Antarctic, "E" stands for Equatorial, "P" stands for Polar, "M" stands for monsoon, and "S" stands for adiabatically drying and warming air.
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How many moles are present in 300.0 mL of acetone, given that the specific gravity of acetone is 0.784.
The number of moles of acetone is 4.1 moles.
What is the number of moles of acetone?Let us recall that specific gravity refers to the ratio of the density of a substance to the density of water. Also noting that the density of water has been set to 1 g/mL, the density of the acetone solution is 0.784 g/mL.
Density = mass/volume
mass = Density * volume
mass = 0.784 g/mL * 300.0 mL
= 235.2 g
Number of moles = mass/molar mass
Molar mass of acetone = 58 g/mol
Number of moles of acetone = 235.2 g/ 58 g/mol
= 4.1 moles
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The enthalpy of combustion of naphthalene (MW = 128.17 g/mol) is -5139.6 kJ/mol. How much energy is produced by burning 0.8210 g of naphthalene?
The energy produced by burning : -32.92 kJ
Further explanationDelta H reaction (ΔH) is the amount of heat change between the system and its environment
(ΔH) can be positive (endothermic = requires heat) or negative (exothermic = releasing heat)
The enthalpy and heat(energy) can be formulated :
[tex]\tt \Delta H=\dfrac{Q}{n}\rightarrow n=mol[/tex]
The enthalpy of combustion of naphthalene (MW = 128.17 g/mol) is -5139.6 kJ/mol.
The energy released for 0.8210 g of naphthalene :
[tex]\tt Q=\Delta H\times n\\\\Q=-5139.6~kJ/mol\times \dfrac{0.8210~g}{128.17~g/mol}~\\\\Q=-32.92~kJ[/tex]
What is the mass of a single bromine molecule, Br2?
The mass of a single bromine molecule, Br₂ is 2.654 x 10⁻²² g.
Bromine is a diatomic element. It has a symbol Br and the atomic number is 35. Bromine is a naturally occurring element which is liquid at room temperature.
Molar mass of Br₂ is 159.808 g/mol. The molar mass of bromine is 79.904 g/mol. In Br₂, there are two bromine atoms.
To calculate the mass of a single bromine molecule -
In 1 mole of Br₂, there is Avogadro's number of molecules.
Avogadro's number = 6.022 x 10²³
Therefore, 1 mole = 6.022 x 10²³
1 mole of bromine has mass of 79.9 g/mol
So, it gives us -
1/6.022 x 10²³ = 1.66 x 10²³/79.9 = 2.654 x 10⁻²²g
For the mass of a single bromine molecule, Br₂ = 2.654 x 10⁻²² g
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How are carbon dioxide (CO2) levels in the atmosphere affected by tectonic uplift of rocks and their resultant chemical weathering?
Answer:
The levels of carbon dioxide (CO2) in the atmosphere are reduced
Explanation:
Tectonic uplift refers to the process by which the surface of the earth slowly rises either due to increasing upward force applied from the plates below the surface or decreasing downward force or weight of objects like melting glaciers acting from above. During uplift, land, as well as the sea floor rises forming mountains, plateaus and volcanic Islands.
During the process of weathering, carbon dioxide present in air combines with rainwater and forms carbonic acid. This acidic rainwater then falls on uplifted mountains and rocks weathering them in the process. Minerals present in the rock such as calcium, magnesium and sodium then combine with bicarbonate ions to form carbonates such as calcium carbonate, magnesium carbonate which are found in shells of living and dead organisms and also form rocks such as limestone. In this way, carbon dioxide is removed from the atmosphere.
The jars below, from left to right, each contain exactly one mole of carbon, sulfur, and aluminum, respectively. Which jar contains the most atoms?
Answer:
D. Each jar contains the same number of atoms
Explanation:
Each of jar containing 1 mole of the element has consisted of an equal number of atoms.
Each jar has been consisted of 1 mole of gas. The number of atoms in a mole of gas can be calculated with Avogadro's number.
Avogadro number has been the constant, that relates the particles and the sample constituents. The value of the Avogadro number has been [tex]\rm 6.023\;\times\;10^2^3[/tex] .
1 mole of gas = Avogadro's number molecules
1 mole of Carbon = [tex]\rm 6.023\;\times\;10^2^3[/tex] atoms of carbon1 mole of Sulfur = [tex]\rm 6.023\;\times\;10^2^3[/tex] atoms of sulfur1 mole of Aluminum = [tex]\rm 6.023\;\times\;10^2^3[/tex] atoms of aluminum.Thus, each of them containing 1 mole of the element has consisted of an equal number of atoms.
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According to the theory of plate tectonics, where do activities such as earthquakes and volcanic eruptions occur?
A
along plate boundaries
B
in the centers of plates
C
above the surfaces of plates
D
in the outer regions of plates
Answer:
A or C.... Any one. If i am wrong let me know!
PLEASE HELP A HOMIIE
Answer:
Its the first one. The cells are arranged for structure.
Explanation:
Animal cells do not need to maintain a shape since out bodies do it for us. Plant cells need something for structure.
can someone explain this better and simpiler?
Response:
Sorry but I think you forgot to attach or include something, thanks for the points tho!
Other:
Brainliest? Thanks!
If I DECREASE the mass and INCREASE the distance, what happens to the force of gravity?
Answer:
Decreases
Explanation:
F = GM1M2/R²
please mark me brainliest and 5 star
How can you increase the gravitational potential energy (GPE) of an empty shoe box on the middle shelf of a bookcase?
Answer:
Add Items to it
Explanation:
Lol I took the test. Sorry If I'm incorrect
Answer:
add items to the box to increase its mass on the self it is on
Explanation: :p
Explain why hydrogen can only have 2 valence electrons around it when it bonds to other items. What is the maximum number of bonds hydrogen will form?
Answer:
In first shell only 2 electrons are present in hydrogen only one electron is present in valence shell. To complete its duplet hydrogen can share lose or gain only one electron to form chemical bond.
Hydrogen can form only one bond.
Explanation:
QUESTION 7
5 points
Save Answer
If you know that ethylene glycol liquid (antifreeze) has a density of 1.113 g/ml, please calculate how much 39.5 cc's of ethylene glycol weighs?
REG: ED 101/6/12062
Course Code:
.
1. Using appropriate chemical equations, explain stellav nucleosynthe
sis of elements; o Ne, Na and Mg ( 6 Marks).
Answer:
See explanation
Explanation:
Nucleosynthesis is the process that creates new atomic nuclei from pre-existing ones via nuclear reactions.
A nuclear reaction involves the nucleus of atoms. It means the transformation of one element to another.
In the image attached i have shown the equations representing the nucleosynthesis of O, Ne, Na and Mg.
The nucleosynthesis of O involves the bombardment of C-12 with alpha particles, gamma rays are produced.
The nucleosynthesis of Ne involves the bombardment of O-16 with alpha particles, gamma rays are produced.
The nucleosynthesis of Na involves the bombardment of Ne-20 with alpha particles, protons are produced.
The nucleosynthesis of Mg involves the bombardment of Ne-20 with alpha particles, gamma rays are produced.
Why doesn't grassland biome naturally support trees
In a typical calorimetry experiment (similar to what you did with the combustion of cheese balls), a small bag of Skittles (10.0 g) was combusted and the temperature of the water (1.00 kg) increased by 40.0 oC. How much energy (in calories and Food calories) was released by the combustion of the Skittles
This question is incomplete, the complete question is;
In a typical calorimetry experiment (similar to what you did with the combustion of cheese balls), a small bag of Skittles (10.0 g) was combusted and the temperature of the water (1.00 kg) increased by 40.0 °C.
a) How much energy (in calories and Food calories) was released by the combustion of the Skittles
b) How many small bags of skittles would a 140 lb person have to eat in order to equal the amount of food calories burned by walking a marathon?
Marathon = 26.2 miles, average person burns 0.453 food calories/mile pound)
Answer:
a)
Number of calories = 40000 Cal
Number of food calorie = 40 KCal
b)
41.54 bags of skittles are required
Explanation:
Given that;
mass of water = 1kg = 1000g
change in Temp ΔT = 40°C
specific heat of H₂O = 4.84 = 1 Cal
Now
heat absorbed by the water = MSΔT
= 1000gm × 1 cal × 40°C = 40000 Cal
so
Number of calories = 40000 Cal
(since food calories = 1000 small calories)
so
Number of food calorie = 40 KCal
Next
number of mile lb , if the man runs in the marathon will be;
26.2 × 140
= 3668 mile lb
0.453 food calorie is burned for 1 mile pound.
So, amount of food calorie required if the man runs in the marathon will be
0.435 × 3668 mile lb
= 1661.60 food calires.
now
40KCal food calorie is released by 10gm.
So, 1661.60 cal will be released from
⇒ (10gm × 1661.60) / 40 = 415.4 gm
now
1 bag = 10gm,
therefore 415.4 gm = 41.54 bags
∴ 41.54 bags of skittles are required
What is the Systematic name for the compound SECI2
Answer: selenium dichloride
Explanation:
Indicate whether aqueous solutions of each of the following solutes will contain only ions, only molecules, or mostly molecules and a few ions:
a) NH4Cl, a strong electrolyte.
b) Ethanol, CH3-CH2-OH, a nonelectrolyte.
c) HCN, hydrocyanic acid, a weak electrolyte.
Answer:
Following are the solution to the given points:
Explanation:
In point a, the answer is only ions because of [tex]NH_4Cl[/tex] has a strong electrolyte.
In point b, the answer is the only molecules because of ethanol [tex]CH_3CH_2OH[/tex], it has a nonelectrolyte.
In point c, the answer is the few ions because of hydrocyanic acid HCN, which has a weak electrolyte.
(a) Only ions.
(b) Only Molecules.
(c) Few ions.
The explanation is as follows:(a) In this, only ions should be considered as it contains strong electrolyte.
(b) In this, only molecules should be considered as it contains non-electrolyte.
(c) In this, few ions should be considered due to hydrocyanic acid HCN, that contains weak electrolyte.
Therefore we can conclude that
(a) Only ions.
(b) Only Molecules.
(c) Few ions.
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What is the percent composition of nitrogen in sodium nitride
Answer:
16.86%
Explanation:
Na3N is sodium nitride.
% of N = mass of N/ molar mass of Na3N *100
% of N = 14/83*100= 16.86%
The percent composition of nitrogen in sodium nitride is 16.86%
What is sodium nitride?Sodium nitride is an inorganic compound that is used in preservatives and antidote for cyanide poisoning.
The molar mass of Na3N is 83 M
The mass of Na3N is 14 g
[tex]% \;of \;N = \dfrac{mass of N}{ molar mass of Na3N } \times 100[/tex]
[tex]\% \;of \;N = \dfrac{mass\; of \;N}{molar\; mass\; of\; Na3N} \times 100\\\\\\\% \;of \;N = \dfrac{14}{83} \times 100 = 16.86\%[/tex]
Thus, the percent composition of nitrogen in sodium nitride is 16.86%.
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Calculate the frequency of a beam of light that is 35.6m long.
Answer:
f = 0.084 s⁻¹
Explanation:
Given data:
Frequency of light = ?
Wavelength = 35.6 m
Solution:
Formula:
Speed of light = wavelength × frequency
Speed of light = 3× 10⁸ m/s
by putting values,
3× 10⁸ m/s = 35.6 m × f
f = 3× 10⁸ m/s / 35.6 m
f = 0.084 s⁻¹
What are the respective concentrations (M) of Mg2+and Cl-afforded by dissolving 0.325 mol MgCl2 in water and diluting to 250 mL?A) 0.0013 and 0.0013B) 0.0013 and 0.0026C) 1.30 and.1.30D) 1.30 and 2.60E) 2.60 and 2.60
Answer: D) 1.30 and 2.60
Explanation:
Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.
[tex]Molarity=\frac{n\times 1000}{V_s}[/tex]
where,
n = moles of solute
[tex]V_s[/tex] = volume of solution in ml
molarity of [tex]MgCl_2[/tex] = [tex]\frac{0.325\times 1000}{250ml}=1.30 M[/tex]
[tex]MgCl_2\rightarrow Mg^{2+}+Cl^{-}[/tex]
As 1 mole of [tex]MgCl_2[/tex] dissociates to give one mole of [tex]Mg^{2+}[/tex] and two moles of [tex]Cl^-[/tex] ions .
Molarity of [tex]Mg^{2+}[/tex] = 1.30 M
Molarity of [tex]Cl^{-}[/tex] = [tex]1.3 M\times 2=2.60M[/tex]
Ions:
Ex: Aluminum has ___3___ valence electrons. It will ______lose 3__ electrons and become an ion with a _____3+_____ charge. (don’t just say + or -)
Chlorine (Cl) has 7 valence electrons. It will _____________ electron(s) and become an ion with a _____________ charge.
Iron (Fe) has 2 valence elecatrons. It will _____________ electron(s) and become an ion with a ______________ charge.
Sulfur (S) has _____________ valence electrons. It will ___________ electron(s) and become an ion with a ________________ charge.
Neon (Ne) has __________ valence electrons. Its valence shell is ___________ so it will neither __________ nor ___________ electrons. It will not become an ion and it will not bond with another atom. It is stable by itself.
Copper (Cu) has 1 valence electron. It will _____________electron(s) and become an ion with a __________ charge.
Which two factors often determine the type of rock that is formed by a process?
A.The type of material that is present at the beginning of the process
B.The amount of time the process of rock formation takes
C.The season in which the rock formation process ends
D.Whether the process takes place north or south of the equator
Answer:
A and B
Explanation:
Trust me I just did it on a p e x
Answer: he’s correct it’s d and b for me but it’s the same answers
Explanation:
20. Rank the following elements from the smallest to largest ionization energy:
a. Sulfur, Oxygen, Polonium, Selenium
Answer:
Polonium
Selenium
Sulfur
Oxygen
Explanation:
If you see in the Table S of the periodic Table there is a column that says First Ionization Energy (kJ/mol) and you can see the numbersof these elements so then you just put it in order
Polonium 812
Selenium 941
Sulfur 1000
Oxygen 1314
Which of the following is NOT a level of organization in an ecosystem? a. community c. population b. ecosystem d. all of the above are levels of organization
Answer:
d. all of the above are levels of organization
Explanation:
The followings are the levels of the organization in an ecosystem
1. Individual
2. Population
3. Community
4. Ecosystem
5. Biome
6. Biosphere
So as per the given situation, it involved all three levels that are mentioned in the question
hence, the correct option is d.
Therefore the same is to be considered
The given option are all consisting in the level of organization of ecosystem. Thus, option D is correct.
The ecosystem has been the geographical representation comprising plants, animals, and other biotic and abiotic components.
The ecosystem has been organized in the levels for the understanding of the working and the activity of the ecosystem. The levels of the ecosystem has been:
IndividualPopulationCommunityEcosystemBiomeBiosphereThe organizational levels of the ecosystem have been comprised of community, population, and ecosystem. Thus all the given are level or organizations in the question. Thus, option D is correct.
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