Answer:
Susie cooked sausages on a barbecue. (a) Fat and water in the sausages changed state. Draw one line from each statement to the correct change of state.
Explanation:
brailest/ crown please
The energy E of the electron in a hydrogen atom can be calculated from the Bohr formula:
E = -Ry/n2
In this equation Ry stands for the Rydberg energy, and n stands for the principal quantum number of the orbital that holds the electron. Calculate the wavelength of the line in the absorption line spectrum of hydrogen caused by the transition of the electron from an orbital with n = 2 to an orbital with n = 8.
Answer:
3.89002 × 10 ⁻⁷m = 389.002nm.
Explanation:
Without mincing words let's dive straight into the solution to the problem above. To calculate the wavelength of the line in the absorption line spectrum of hydrogen caused by the transition of the electron from an orbital with n = 2 to an orbital with n = 8, there is the need to make use of the change in energy equation.
The change in energy = 2.18 × 10⁻¹⁸ [ 1/2² - 1/8²] = 2.18 × 10⁻¹⁸ × [0.25 - 0.015625] = 2.18 × 10⁻¹⁸ × 0.234375 = 5.11 × 10⁻¹⁹.
Therefore, the wavelength = plank's constant × speed of light/ change in energy = 6.626× 10⁻³⁴ × 3 × 10⁸/ 5.11 × 10⁻¹⁹ = 1.9878 × 10⁻²⁵/ 5.11 × 10⁻¹⁹ = 0.389002 × 10⁻⁶ = 3.89002 × 10 ⁻⁷m = 389.002nm.
Besides plants, do other organism get their energy directly from the Sun?
yes or no
yes they doExplanation:
Answer:
yes they do get there energy From the sun everything does
Use molecular orbital theory to determine which of the following dicarbon species is expected to have the longest bond length. Use the following valence MO order: σ2s < 'σ*2s < π2py = π2pz < σ2px < π*2pz < σ*2px.
a. C2^-2
b. C2^-
c. C2
d. All the dicarbon species have the same bond length
e. C2+
Answer:
e. C2+
Explanation:
In the molecular orbital theory, the valence electrons in molecules are filled into molecular orbitals in accordance with Hund's rule and Pauli exclusion theory.
The orbitals are filled in order of increasing energy (Aufbau principle) as shown in the question. The bond order refers to half the difference between the number of bonding and antibonding electrons in the molecule.
The smaller the bond order the longer the bond length and vice versa. The specie having the least bond order is C2+ with a bond order of 1.5. This specie certainly has the longest bond length also. Hence the answer.
Applying molecular orbital theory the dicarbon specie that has the longest bond length is ; ( E ) C₂⁺
The valence electrons in molecules fill up molecular orbits in accordance to Pauli exclusion theory and Hund's rule. while
The bond order is the difference between bonding and antibonding electrons found in a molecule divided into half. while the molecule orbitals are filled according to increasing energy in accordance to Aufbau principle
The bond order of a molecule is inversely proportional to the bond length of the molecule. Therefore the dicarbon specie that has the longest bond length is C₂⁺ because it has the shortest bond length of approximately 1.5.
Hence we can conclude that Applying molecular orbital theory the dicarbon specie that has the longest bond length is ; ( E ) C₂⁺
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The reaction Pb(NO3)2 (aq) + 2 Kl (aq) ---> Pbl2 (s) + 2 KNO3 (aq) is a(n)
What reaction is this?
Answer:
Double decomposition reaction
Explanation:
The reactants potassium iodide and lead nitrate react to from potassium nitrate and lead iodide, From this it is clear that, radicals are intercharged by the decomposition of reactants. Hence, it is a double decomposition reaction.
Which of the following is a molecular compound?
D KI
D CC14
NaBr
0 MgCl2
Answer:
it is NaBr. It is known as sodium bromide.
A student measured the mask of an object to be 30.4g and the volume to be 3.5 mL. What is the density?
33.9 g/mL
26.9 g/mL
0.115 g/mL
8.69 g/mL
Answer: 8.69 g/mL
Explanation:
Answer:
Density = 8.69g/mL
Explanation:
Density = Mass/Volume
Density = 30.4g/3.5mL
Calculate the concentration of hydrogen ions in a healthy person’s blood that has a pH of 6.40.
Answer:
[H⁺] = 3.98×10⁻⁷ M
Explanation:
Given data:
pH of blood = 6.40
Hydrogen ion concentration = ?
Solution:
Formula:
pH = - log[H⁺]
by rearranging this formula,
[H⁺] = 10⁻(pH)
By putting values,
[H⁺] = 10 ⁻⁶°⁴⁰
[H⁺] = 3.98×10⁻⁷ M
What is the total number of atoms of magnesium and phosphorus in 3Mg3(PO4)2?
Identify the element of Period 2 which has the following successive ionization energies in kJ mol:
IE1,1314 IE2,3389 IE3,5398 IE4, 7471
IE5, 100992 IE6,13329 IE,71345 IE8,84087
a. Li
b. B
c.O
d. Ne
e. None of these
Answer:
c.O
Explanation:
From the periodic table:
Ionization energy tends to increase from IE6 → IE7 drastically at 13329 to 71345. Hence, from this process, we can infer that the removal of electrons takes place from the inner shell which in turn has a higher affinity for the nucleus. This must be oxygen because oxygen contains 6 valence electrons. The removal of this valence electron after the sixth ionization results in the achievement of a stable nearest Noble gas configuration. Hence, the rapid change in the ionization is obvious from IE6 to IE7.
Thus, the element that relates to the IE trend is oxygen.
A breeder reactor is one type of nuclear reactor. In a breeder reactor, uranium-238 is transformed in a series of nuclear reactions into plutonium-239.
The plutonium-239 can undergo fission as shown in the equation below. The X represents a missing product in the equation.
Compare the amount of energy released by completely fissioned plutonium-239 to the amount of energy released by the complete combustion of the same amount of coal.
Answer:
Hope it helps
Explanation:
3
(2 Points)
How many moles of CO2 is 6.9x1030 particles of CO2?
A. 1.1x10’moles
B. 1.1x10 moles
C.1.3x103 moles
D. 1.3x10’moles
Answer:
Explanation:
B
Convert 10 kilometers to miles
Answer:
6.21
Explanation:
Answer:
6.21371192 or ~ 6.21
Explanation:
10 kilometers is the same as 6.21371192 miles or ~ 6.21
All you need to do is divide the value of the kilometers by "1.609344" to convert it, into miles
Hope this helped!
Have a supercalifragilisticexpialidocious day!
Ribosomes are packets of RNA and protein that play a crucial role in both animal and plant cells. Ribosomes aid in the process of
Answer: mutation
Explanation:
Complete the following sentences to identify the process that ice, water, or water vapor may undergo if either the temperature or the pressure is increased.
Match the words in the left column to the appropriate blanks in the sentences on the right. Make certain each sentence is complete before submitting your answer.
FREEZE 1. If ice is heated at a constant pressure of 0.00512 atm, it will_____________.
CONDENSE 2. If ice is heated at a constant pressure of 1 atm, it will_____________.
MELT 3. If the pressure of water vapor is increased at a constant pressure of 100 degrees Celsius,it will____.
SUBLIME 4. If the pressure of water vapor is increased at a constant pressure of -50 degrees Celsius,it will__.
VAPORIZE
DEPOSIT
Answer:
Freeze
Condense
Melt
Sublime
Explanation:
Fill in the blank with the vocabulary term that fits the definition written. All your answers should be in lower case. You may need to submit the same answer for multiple blanks.
a. A reaction that results in the formation of water as an end product:__________
b. A reaction that requires water as a reactant: __________
c. A functional group on an amino acid that is polar and can become positively charged: _________
d. A functional group on an amino acid that is polar and can become negatively charged: _________
e. A functional group that is basic and part of the amino acid backbone: ___________
Answer:
1. Condensation.
2. Hydrolysis.
3. Amino group (Amine).
4. Carboxyl group.
5. Amino group.
Explanation:
a. A reaction that results in the formation of water as an end product: condensation.
b. A reaction that requires water as a reactant: hydrolysis.
c. A functional group on an amino acid that is polar and can become positively charged: amino group (amine).
d. A functional group on an amino acid that is polar and can become negatively charged: carboxyl group.
e. A functional group that is basic and part of the amino acid backbone: amino group (amine).
What is the percent composition of each element in Fe (Cr202)3?
I dont knowExplanation:
23. How many different elements are in the compound sodium carbonate (Na2CO3)? *
a. 1
b. 3
C. 6
d.7
Na, C, and O so the answer is c. 3
In a chemical reaction, where is the catalyst located
A. on the reactant side
B. on the product side
C. above the arrow
D. on both sides of the arrow
Answer:
A. on the reactant side
Explanation:
A catalyst will appear in the steps of a reaction mechanism, but it will not appear in the overall chemical reaction
Gallium is one of the few metals that can melt at room temperature. Its melting point is 29.768C. If you leave solid gallium in your car on an early summer morning when the temperature is 75.08F, what physical state is the gallium in when you return to your car and the interior car temperature is 85.08F
Answer:
solid
Explanation:
If you were to leave the gallium in the interior of the car at those temperatures the gallium would still be in a solid physical state when you return. This is because the temperature in Fahrenheit when you return is 85.08F which converted to Celsius would equal 29.488C. This is close to Gallium's melting of 29.768C point but does not exceed it, meaning that it is close to melting but has not yet done so and is, therefore, still a solid.
Does the acid rain make a new substance? yes or no
Answer:
yes
Explanation:
the answer is yes
For the reaction CH4 + 2O2 = 2H2O + CO2
How many moles of water are produced from the combustion of 45.2 grams od methane (CH4)? Please show all work.
Answer:
(2H2O)=5.6mol
Explanation:
45.2g produce x mole of CH4
we are given the mass of methane
mass (CH4)=45.2g
molar mass (CH4) = 12+4 =16g/mol
Mole=mass
molar mass
mole=45.2
16
mole=2.8mol
therefore, if 45.2g produce 2.8mol as 1 mole of methane, the water produced is 2(2.8) we Are multiplying by 2 because the water is having 2 moles water mole is 5.6mol
How many moles of argon are contained in 58 L of At at STP?
Answer:
n = 2.58 mol
Explanation:
Given data:
Number of moles of argon = ?
Volume occupy = 58 L
Temperature = 273.15 K
Pressure = 1 atm
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
1 atm × 58 L = n × 0.0821 atm.L/ mol.K × 273.15 K
58 atm.L = n × 22.43 atm.L/ mol.
n = 58 atm.L / 22.43 atm.L/ mol
n = 2.58 mol
the absolute age of a rock is approximate number of years ago that the rock formed. The absolute age of an igneous rock can best be determind by
A. measuring the amounts of radioactive isotopes in the rock
B. comparing the sizes of the crystals found in the upper and lower parts of a rock
C. examining the rock's relative position in a rock outcrop
D. observing the environment in which the rock is found
The absolute age of an igneous rock can best be determined by measuring the amounts of radioactive isotopes in the rock. Option A is correct.
Igneous rock is formed and arises as a result of the cooling and solidification of the molten magma underneath the earth surface.
Igneous rock can best be determined by measuring the amounts of radioactive isotopes present in the rock because this will be used for radiometric dating which will eventually determine the absolute age of the igneous rock.
Learn more about radioactive isotopes here:
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% Yield (10 points): 8. Using the reaction above: a. Calculate the theoretical yield of the product if you started with 5 grams of the starting aldehyde (4 points). b. Calculate the theoretical yield of the product if you started with 3 grams of butyl MgBr (4 points). c. Which starting material is the limiting reagent (2 points)
Answer:
a) m = 7.9 g
b) m = 3.002 g
c) butyl MgBr
Explanation:
First, you are not providing the reaction, so if difficult to solve this without it. However, I manage to find a similar question so I'm gonna solve this on basis with that question. The picture attached has the question and reaction.
Now, according to the image we have a wittig reaction. Which is commonly used to convert an aldehyde into an alcohol. As we can see in the picture, the reaction starts with hexanal and butyl MgBr (Grignard reagent) in acid medium. This gives as a product the 5-pentanol.
Let's write again the reaction here:
C₆H₁₂O + C₄H₉MgBr -----------> C₁₀H₂₂O + OHMgBr
We can see that the reaction is perfectly balanced so we don't need to balance. And we also can see that we have a mole ratio of 1:1 between the reactants and the products, which means that the calculated moles of either one reactant or the other, would be the same moles of the products.
To calculate moles, and afterward, the yield, we need the molecular weight of all compounds:
MM C₆H₁₂O = 100 g/mol
MM C₄H₉MgBr = 161.32 g/mol
MM C₁₀H₂₂O = 158 g/mol
With this given MM, let's calculate the theorical yield of the product in each case:
a) 5 grams of aldehyde
In this case, let's calculate the moles of the given aldehyde:
moles = 5 / 100 = 0.05 moles
Assuming this is the limiting reagent, the moles of the aldehyde would be the same moles of the product, so:
moles aldehyde = moles product = 0.05 moles
So the theorical yield would be:
m product = 0.05 * 158
m = 7.9 g of C₁₀H₂₂Ob) 3 grams of butyl MgBr
In this case, we will do the same thing as before, and we will assume that this is limiting reagent so:
moles = 3 / 161.32 = 0.019 moles
m C₁₀H₂₂O = 0.019 * 158
m C₁₀H₂₂O = 3.002 gc) limiting reagent
Now this is easier, because if we have 5 g of aldehyde and 3 g of grignard reagent, we already has the moles of each with these masses, therefore, as both starting materials have a 1:1 mole ratio, we can see that the moles of the aldehyde are higher than the moles of grignard agent, therefore, the limiting reagent would be the butyl MgBr while the aldehyde would be the excess.
Limiting reagent = Butyl MgBrHope this helps
How can you tell if glucose is present?
Answer:
The glucose urine test measures the amount of sugar (glucose) in a urine sample.
rearrange the expression in to quadratic form
0.20=²÷45−
......what is that 2 after =
The coyote is found across North America which makes it a specialist species.
Answer: false
Explanation:
What is true about most of the wavelengths found in the electromagnetic spectrum?
A
They travel only through prisms.
B
They are found in the visible light range.
С
They are dangerous to humans.
D
They are invisible to the human eye.
2 2. The energy stored in a substance that can be released when the substance reacts. A. Mechanical Energy B. Thermal Energy C. Chemical Energy D. Potential Energy
Answer:
C. Chemical Energy
Explanation:
The energy that stored in the substance or in compounds is called chemical energy which released when the substance reacts.
A substance is made up of atoms and molecules and chemical energy is present in those atoms or molecules. When a chemical reaction takes place, these energy released from atoms and molecules.
Chemical energy can be released in the form of thermal energy (heat) and mechanical energy (working ability).
Hence, the correct answer is "C. Chemical Energy".
When equal volumes of 0.5 M H2SO4 and 0.5 M NaOH are mixed, the resulting solution is
The concentration of mixed solution = 0.5 M
Further explanationGiven
0.5 M H₂SO₄
0.5 M NaOH
Required
The concentration
Solution
Molarity from 2 solutions :
Vm Mm = V₁. M₁ + V₂. M₂
m = mixed solution
V = volume
M = molarity
V = mixed volume
1 = solution 1
2 = solution 2
Vm = V₁+V₂
Equal volumes⇒V₁=V₂, and Vm = 2V, then equation becomes :
2V.Mm = V(M₁+M₂)
2V.Mm = V(0.5+0.5)
Mm=0.5 M
