Answers
Answer:
The answer is 2.31×10^12
Explanation:
(4.2×10^9)(5.5×10^2)
(4.2×5.5)×(10^9×10^2)
23.1×10^9+2
23.1×10^11
Answer:2.31×10^12
Related Questions
How can you increase the gravitational potential energy (GPE) of an empty shoe box on the middle shelf of a bookcase?
Answers
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
How many moles are present in 300.0 mL of acetone, given that the specific gravity of acetone is 0.784.
Answers
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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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?
Answers
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:
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?
Answers
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]
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
Answers
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:
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
Answers
Answer:
A or C.... Any one. If i am wrong let me know!
which letters of an air mass represents moisture content
Answers
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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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
Answers
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.
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?
Answers
it’s quite simple.
The newton force in a aerodynamic space which could lead to a catastrophic entanglement will be added to the physical quantum molecular structure then subtracted by its opposite, inter dimensional indispensable aerobic activity, then finally multiplied by the sum which was subtracted by the addition to then divide the sum of it all with the solution of the multiplication which would equal to the answer.
What is the correct structure for 7-methyl-4-octanone?
Answers
Answer:
7-METHYL-4-OCTANONE 7-methyloctan-4-one 20809-46-5 4-Octanone, 7-methyl- 7-methyl-octan-4-one More...
Explanation:
Name the group of elements that will not participate in ionic bonding.
Alkali Metals
Alkaline Earth Metals
Transition Metals
Halogens
Noble Gases
Answers
Answer:
Noble Gases
Explanation:
Noble gases are very unreactive because they already have a full valence shell and therefore, do not need to bond.
Answer:
Noble gases
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.
Answers
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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. The molar mass of aluminum is 26.98 g/mol and the molar mass of fluorine is 19.00 g/mol. Calculate the molar mass of aluminum trifluoride, AlF3.
Answers
Answer:
83.98 g/mol
Explanation:
To find the molar mass of AlF₃, you need to add the individual molar masses of each element times their quantities. For instance, since there are 3 fluorine atoms in AlF₃, the molar mass of AlF₃ must include the molar mass of fluorine times 3.
Molar Mass (Al): 26.98 g/mol
Molar Mass (F): 19.00 g/mol
Molar Mass (AlF₃): 26.98 g/mol + 3(19.00 g/mol)
Molar Mass (AlF₃): 83.98 g/mol
List down 10 different types of minerals (metallic and non metallic) include the different uses and help in the economy of these minerals.
Answers
Answer:
names of 10 metallic minerals are Silver, Chromium, Tin, Nickel, Copper, Iron, Lead, Aluminum, Gold, and Zinc.
Explanation:
What pressure would 2.5 moles of N2 gas exerton the walls of a 10.0 L container at a temperature of 25 C (298 K)
Answers
Answer:
6.1 atm
General Formulas and Concepts:
Chemistry - Gas Laws
Combined Gas Law: PV = nRT
P is pressure in atmV is volume in Litersn is number of molesR is the gas constant: 0.0821 (L · atm)/(mol · K)T is temperature in KelvinsTemperature Conversion: K = °C + 273.15
Explanation:
Step 1: Define
n = 2.5 mol N₂
V = 10.0 L
T = 25 °C = 298.15 K
Step 2: Find Pressure P
Substitute: P(10 L) = (2.5 mol)(0.0821 (L · atm)/(mol · K)(298.15 K)Multiply: P(10 L) = 61.1953 L · atmIsolate P: P = 6.11953 atmStep 3: Check
We are given 2 sig figs as our lowest. Follow sig figs and round.
6.11953 atm ≈ 6.1 atm
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
Answers
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]
If I DECREASE the mass and INCREASE the distance, what happens to the force of gravity?
Answers
Answer:
Decreases
Explanation:
F = GM1M2/R²
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How many molecules are present in 187 grams of XeF4
Answers
There are 5.43 x 10²³ present in 187 grams of XeF₄
Further explanationThe mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
Moles can also be determined from the amount of substance mass and its molar mass
[tex]\tt n(mol)=\dfrac{mass(m)}{MW}[/tex]
mass of XeF₄ = 187 g
mol XeF₄ (MW=207,2836 g/mol) :
[tex]\tt mol=\dfrac{187}{207,2836 g/mol}=0.902[/tex]
Number of molecules :
[tex]\tt N=0.902\times 6.02\times 10^{23}\\\\N=5.43\times 10^{23}[/tex]
Which of the following substances has bonds with the greatest ionic character?
A) CCl4
B) CuCl2
C)CaCl2
D)NCl3
Answers
Answer:
Explanation:
because Ca is of second group they have low ionization energy when react with chlorine they have more ionic character than other in given options
The products of a combustion reaction include:
A: water and carbon dioxide
B: hydrogen, water, and carbon dioxide.
C: water and carbon monoxide.
D: hydrogen and water.
Answers
Answer:
A
Explanation:
Combustion reactions always produce water and CO2
The products for the combustion have been water and carbon dioxide along with the liberation of heat. Thus, option A is correct.
Combustion can be defined as the process of burning carbon-based compounds in the presence of oxygen. Combustion has been the process that liberates heat energy.
The combustion can be given as:
Hydrocarbon [tex]\rightarrow[/tex] Carbon dioxide + Water + Heat
The products for the combustion have been water and carbon dioxide along with the liberation of heat. Thus, option A is correct.
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PLEASE HELP A HOMIIE
Answers
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.
Why doesn't grassland biome naturally support trees
Answers
Consider the reaction of glucose with oxygen: C6H12O6(s) + 6O2(g) Right arrow. 6CO2(g) + 6H2O(l)
The enthalpy of formation (Delta.Hf) for C6H12O6(s) is –1,273.02 kJ/mol, Delta.Hf for CO2(g) is –393.5 kJ/mol, and
Delta.Hf for H2O(l) is –285.83 kJ/mol. What is Delta.Hf for O2(g)?
Which equation should be used to calculate Delta.Hrxn for this reaction?
(-393.5kJ/mol + (-285.83 kJ/mol))-(-1,273.02 kJ/mol)
-1,273.02 kJ/mol - ((6 mol)(-393.5 kJ/mol) + (6 mol)(-285.83 kJ/mol))
((6 mol)(-393.5 kJ/mol) + (6 mol)(-285.83 kJ/mol)) - (1 mol)(-1,273.02 kJ/mol)
What is Delta.Hrxn for this reaction?
answer: first, third, -2803
Answers
We can effectively that the correct equation of the reaction is correctly written as ((6 mol)(-393.5 kJ/mol) + (6 mol)(-285.83 kJ/mol)) - (1 mol)(-1,273.02 kJ/mol).
What is the heat of reaction?The heat of reaction is the heat that could be absorbed or evolved in a reaction. We know that a reaction could be an exothermic or an endothermic reaction. In an exothermic reaction, energy is given out while an endothermic reaction is one in which heat is absorbed.
Having said this, we know that the reaction is a combustion reaction. Heat is always given out in a combustion reaction thus we know that the process is exothermic and the sign of the heat of reaction is negative.
Let us now look at the reaction as shown, we can see that it involves the combustion or burning of glucose in oxygen. We now seek to obtain the correct equation for the combustion reaction.
Thus, we can now write effectively that the correct equation of the reaction is correctly written as ((6 mol)(-393.5 kJ/mol) + (6 mol)(-285.83 kJ/mol)) - (1 mol)(-1,273.02 kJ/mol).
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What is the chemical symbol?
Answers
Answer:
symbol is Al
Explanation:
aluminum is that element
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How are carbon dioxide (CO2) levels in the atmosphere affected by tectonic uplift of rocks and their resultant chemical weathering?
Answers
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.
When testing for hydrogen gas in the laboratory a glowing splint is inserted into the gas which results in a pop sound. What is associated with the formation of the pop sound?
A. physical change
B. chemical change
C. exothermic reaction
D. endothermic reaction
Answers
can someone explain this better and simpiler?
Answers
Response:
Sorry but I think you forgot to attach or include something, thanks for the points tho!
Other:
Brainliest? Thanks!
What is the percent composition of nitrogen in sodium nitride
Answers
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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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.
Answers
iron: lose, +2 charge.
sulfur: 6, gain, -2 charge.
copper: lose, +1 charge.
Is atomic radius a periodic property of atoms??