Answer:
The Formal Charge of Each Atom
Explanation:
I just took the test!
Answer:
A. The formal charge of each atom
Explanation:
What is the wavelength of a wave releasing an energy of 3.713 x 10-17 J?
Answer:
C = λν E = hν C = 3.00 x 108 m/s h = 6.626 2 x 10-34 J-s (or J/Hz) 1 eV = 1.602 x 10-19 J
Explanation:
Question 1 (Worth 3 points)
(02.04 MC)
The diagram shows four different locations in an atom.
A shaded circle is shown, labeled nucleus. Two small points labeled two and three are shown inside this shaded circle. A lighter shaded concentric circle is shown with a radius more than double the radius of the inner circle. A point labeled one is shown inside a section of this circle which does not overlap with the inner circle. A flower petal like shaded region is shown above and below these circles. A point labeled four is shown inside the lower petal.
Which locations are likely to have subatomic particles with the least mass?
1 and 2
2 and 3
1 and 4
3 and 4
Answer:
answer C) 1 and 4
Explanation:
Answer:
C) 1 and 4
Explanation:
I took the test. Hope this helps!
A peak elutes from an HPLC column 17.7 cm in length in 11.1 min. What would be the width at half‑height of the peak (in seconds) if the plate height were 8.68 μm?
Answer:
10.98 s
Explanation:
To solve this problem we first use the formula:
H = L/NWhere:
H = Plate height (8.68 μm, or 8.68x10⁻⁶m)L = Column length (17.7 cm, or 0.177 m)N = Number of theoretical plates (unknown)And solve for N:
N = 0.177 m / 8.68x10⁻⁶mN = 20392 platesThen we use the formula:
N = 5.54*[tex](\frac{t_r}{W_{0.5}})^2[/tex]Where:
N is the number of theoretical plates previously calculated. tr is the retention time (11.1 min, or 666s)W₀.₅ Is the width at half-height (unknown)And solve for W₀.₅:
W₀.₅ = 10.98 sa 500 ml aqueous solution of na3po4 was prepared using 82g of the solute. what is the molarity
Answer:
1 M
Explanation:
The molarity of a solution, M, is a measure of the concentration of that solution and it refers to the number of moles of solute (mol) per liter (L) of solution. The molarity (M) can be calculated using the formula:
M = number of moles (n) /volume (V)
In this question, a 500 ml aqueous solution of Na3PO4 was prepared using 82g of the solute.
Molar mass of Na3PO4 = 23(3) + 15 + 16(4)
= 69 + 31 + 64
= 164g/mol
Mole = mass/molar mass
mole = 82/164
mole = 0.5 mol
Volume in Litres (L) = 500 ml ÷ 1000 = 0.500L
Therefore, Molarity (M) = 0.5/0.500
Molarity = 1 M or 1 mol/L
The molarity of the solution is 1 M
From the question,
We are to determine the molarity of the solution.
First, we will determine the number of moles of the solute (Na₃PO₄) present
Mass of Na₃PO₄ = 82 g
Using the formula
[tex]Number\ of\ moles = \frac{Mass }{Molar\ mass}[/tex]
Molar mass of Na₃PO₄ = 163.94 g/mol
∴ Number of moles of Na₃PO₄ present = [tex]\frac{82}{163.94}[/tex]
Number of moles of Na₃PO₄ present = 0.500 moles
Now, for the molarity of the solution
Using the formula
[tex]Molarity = \frac{Number\ of\ moles}{Volume}[/tex]
Volume of the solution = 500 mL = 0.5 L
∴ Molarity of the solution = [tex]\frac{0.500}{0.5}[/tex]
Molarity of the solution = 1 M
Hence, the molarity of the solution is 1 M
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How many kJ are required to completely vaporize a 25.0 gram sample of water at 100°C? general formula:
Answer:
56500J
Explanation:
Given parameters:
Mass of water = 25g = 0.025kg
Temperature of the water = 100°C
Unknown:
Amount of heat required to vaporize the water = ?
Solution:
The amount of heat required to vaporize the water is a function of the mass of the water and the latent heat of vaporization of water.
H = mL
H is the amount of heat
m is the mass
L is the latent heat of vaporization of water = 22.6 x 10⁵J/Kg
H = 0.025 x 22.6 x 10⁵ = 56500J
Dennie wanted to see if crayfish preferred one kind of food over another. He gave one group of crayfish plants, both living and dead, to eat. He gave the other group insects, living and dead, to eat. What is the independent variable in Dennie's experiment? a)type of food b)weight of crayfish c)typeof water used d)age of crayfish
Answer:
A) type of food.
A 0.216 g sample of carbon dioxide, CO2, has a volume of 507 mL and a pressure of 470 mmHg. What is the temperature of the gas in kelvins?
Answer:
The temperature of the gas is 876.69 Kelvin
Explanation:
Ideal gases are a simplification of real gases that is done to study them more easily. It is considered to be formed by point particles, do not interact with each other and move randomly. It is also considered that the molecules of an ideal gas, in themselves, do not occupy any volume.
The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:
P*V = n*R*T
where P is the gas pressure, V is the volume that occupies, T is its temperature, R is the ideal gas constant, and n is the number of moles of the gas.
In this case:
P= 470 mmHgV= 570 mL= 0.570 Ln= 0.216 g= 0.0049 moles (being the molar mass of carbon dioxide is 44 g/mole)R= 62.36367 [tex]\frac{mmHg*L}{mol*K}[/tex]T=?Replacing:
470 mmHg*0.570 L= 0.0049 moles* 62.36367 [tex]\frac{mmHg*L}{mol*K}[/tex] *T
Solving:
[tex]T=\frac{470 mmHg*0.570 L}{0.0049 moles* 62.36367\frac{mmHg*L}{mol*K} }[/tex]
T= 876.69 K
The temperature of the gas is 876.69 Kelvin
Calculate the speed of the car at each checkpoint by dividing the distance between each checkpoint in meters by the change in time. Record your answers in Table C of your Student Guide. The speed at the first quarter checkpoint is m/s. The speed at the second quarter checkpoint is m/s. The speed at the third quarter checkpoint is m/s. The speed at the finish line is m/s.
The speed of the car at each checkpoint cannot be determined because the parameter is not given.
What is the speed of a moving car?For a moving car, the speed can be defined as the change magnitude in the position of a car or the distance traveled by the car within a specified time.
Mathematically;
[tex]\mathbf{speed = \dfrac{distance}{time}}[/tex]
From the information given; the distance at each checkpoint can be calculated by finding the difference in distance between the previous checkpoint and subsequent checkpoint divided by the change in time.
i.e
[tex]\mathbf{speed = \dfrac{d_A - d_B}{\Delta t}}[/tex]
where:
[tex]\mathbf{d_A-d_B}[/tex] = distance between checkpoints A and BLearn more about the speed of a car here:
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answer is below . . .
how many moles of water are needed to react with 100. g of al4c3
Answer:
8.4 moles
Explanation:
Al4C3 + 12 H2O ---> 4 Al(OH)3 + 3 CH4
100g of Al4C3 = 100/144 = 0.7 moles
from the reaction above,
1 mole of Al4C3 = 12 moles of water
0.7 moles of Al4C3 = x moles of water
x = 12×0.7/1 = 8.4 moles
Therefore 8.4 moles of water is needed to react with 100. g of al4c3
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The moles of water are needed to react with 100. g of al4c3 - 8.34 moles.
The reaction can be expressed as -
Al₄C₃ + 12 H₂O → 4 Al(OH)₃ + 3 CH₄
By the equation, it can be said that 1 equivalent of Al₄C₃ reacts with the equivalent of 12 H₂O to generate 4 Al(OH)₃ and 3 CH₄.
the given mass of Al₄C₃ = 100 gthe molar mass of Al₄C₃ = 143.959the molar mass of H₂O = 18.015the moles = mass + molar mass
then for moles of Al₄C₃ = 100 + 143.959
= 0.6946 moles.
or, 216/143.959
for 100 gram = 21600/143.959
= 150. 0416
moles of H₂O required = [tex]\frac{12\ mole\ of H_{2} O}{1\ mole\ of\ Al_{4} C_{3}}[/tex]
= 150.0416/18
= 8.43 moles.
Thus, the moles of water are needed to react with 100. g of al4c3 - 8.34 moles.
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10. What does a full moon look like from earth? *
Your answer
Answer:
like a circle
Answer:
it would look white and its a circle
Explanation:
pLEASE MARK BRAINLIEST
Suppose you had four spoons the same size and shape made out of glass, plastic, steel, and wood. Which spoon handle would get hot the quickest when the spoons are placed in a pan of hot water?
Question 14 options:
A. steel spoon
B. plastic spoon
C. wood spoon
D. glass spoon
Answer:
A. steel spoon
Explanation:
A steel spoon will get hot the quickest from the different given spoon. This is because steel is predominantly made up of a metal which shows metallic properties such as heat conduction.
Metals have low specific heat capacity which is the amount of head needed to raise 1g of a substance by 1°C. By so doing, metals will conduct heat at a very fast rate. The delocalized electron around the central nucleus plays very important role.Other properties originating from metallic bonds are ductility, malleability, luster etc.
If 2.50 ml of vinegar requires 34.50 ml of 0.0960 M NaOH to reach the equivalence point in a titration, how many grams of acetic acid are in 500.0 ml of this vinegar? Density of vinegar=1.01 g ml
Grams of acetic acid in 500 ml vinegar=39.744 g
Further explanationTitration (equivalence point⇒mol acid(CH₃COOH)=mol base(NaOH))
M₁V₁n₁=M₂V₂n₂(n=valence acid/base, for CH₃COOH and NaOH=1)
[tex]\tt M_1\times 2.5\times 1=0.0960\times 34.5\times 1\\\\M_1(acetic~acid)=1.3248~mol/L[/tex]
For MW CH₃COOH = 60 g/mol, mass of acetic acid in 1 L :
[tex]\tt 1.3428~mol/L\times 60~g/mol=79.488~g/L[/tex]
for 500 ml :
[tex]\tt 79.488\times 0.5~L=39.744~g[/tex]
The mass of vinegar present in 500mL of solution is 39.6 g.
Concentration of acid (CA) = ?
Volume of acid(VA) = 2.50 ml
Concentration of base (CB) =0.0960 M
Volume of base (VB) = 34.50 ml
Number of moles of acid = 1
Number of moles of base = 1
Equation of the reaction;
CH3COOH (aq) + NaOH(aq) ------> CH3COONa(aq) + H2O(l)
From CAVA/CBVB = NA/NB
CAVANB = CBVBNA
CA = CBVBNA/VANB
CA = 0.0960 × 34.50 × 1/2.50 × 1
CA = 1.32 M
Number of moles = concentration × volume
Number of moles = 1.32 M × 500/1000
Number of moles = 0.66 moles
Number of moles = mass/molar mass
Mass = Number of moles × molar mass
Molar mass of acetic acid = 60 g/mol
Mass = 0.66 moles × 60 g/mol
Mass = 39.6 g
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Which of the following substances would you expect to have a low melting point?
A. carbon dioxide
B. silicon dioxide
C. lithium chloride
D. calcium bromide
Ionic compounds have higher melting point than covalent compounds.
Carbon dioxide have lower melting point (-56.6 °C) among the given compounds.
What is melting point?Melting point is the temperature at which the substance melts into liquid thus at this temperature its solid state and liquid state are in equilibrium. Melting point is depend upon the bond type and mass of the compound.
Ionic bonds are stronger than covalent bonds and hence ionic compounds have higher melting point than covalent compounds. Hence, lithium chloride and calcium bromide have higher melting point.
Silicon is bigger than carbon thus silicon dioxide melts at higher temperature. Carbon dioxide is purely covalent and melts at negative temperatures.
Hence, the compound with lower melting point here is carbon dioxide thus, option A is correct.
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What values of ℓ are possible for a shell with n = 4
Answer:
0, 1, 2, 3
General Formulas and Concepts:
Chemistry - Atomic Structure
Principal Energy Level n (1 to ∞)Angular Momentum ℓ (n - 1)Magnetic mℓElectron Spin msExplanation:
Step 1: Define quantum number
Principal Energy Level n = 4
Step 2: Define ℓ
ℓ is the Angular Momentum. Its values start at 0, 1, 2, 3...
It is the Principal Energy Level n minus 1 (n - 1).
Step 3: Find
n = 4
ℓ = 4 - 1 = 3
Therefore, out angular momentum values can be 0, 1, 2, 3. These correlate to s, p, d, f sublevels.
If 0.0369 mol CaCl2 is dissolved in water to make a 0.340 M solution, what is the volume of the solution
Answer:
The correct answer is 0.11 L
Explanation:
From the problem, we have the following data:
moles CaCl₂= 0.039 mol
molarity = 0.340 M = 0.340 mol CaCl₂/L
According to this, the solution has 0.340 mol of CaCl₂ in 1 L. If the total number of moles is 0.0369, we can find the volume as follows:
V= moles/molarity = 0.0369 mol x 1 L/0.340 mol = 0.108 L ≅ 0.11 L
7. A student has a 25 g sample of gas in a container at STP and adds another 7
g of the gas while keeping the pressure constant, what is the new temperature in
degrees Celsius?
Answer:
New temperature t2 = [1.28T− 273.15]° C
Explanation:
Given:
Volume v1 = 25 gram
New volume v2 = 25 + 7 = 32 gram
Constant pressure = p
Temperature t1 = T
Find:
New temperature t2
Computation:
Pv1/t1 = Pv2/t2
25 / T = 32 / t2
t2 = 1.28T
New temperature t2 = [1.28T− 273.15]° C
. A 20.0 % by mass solution of phosphoric acid (H3PO4) in water has a density of 1.114 g/mL at 20°C. What is the molarity of this solution?
The molar mass of phosphoric acid (H3PO4) is 97.99 g.
Answer:
2.273M
Explanation:
What is the definition of molarity.
M = mols/L. So that's what we need to determine.
How much does a L weigh? That's
1.114 g/mL x 1000 mL = 1114 grams. Simple enough, eh?
How much of that 1114 g is H3PO4. It says it is 20% by mass, therefore, 1114 g x 0.20 = 222.8 g.
How many mols are there in 222.8 g H3PO4? That's mools = grams/molar mass = 222.8/98 = 2.273 mols.
The definition of M is what? M = mols/L. And you have 2.273 mol/L; that must be the molarity.
The formula is
density g/mL x 1000 mL x mass% x (1/molar mass) = M
1.114 x 1000 x 0.20 x (1/98) = 2.273 M.
Determine how many moles of O2 are required to react completely with 4.6 mol of C4H10
Answer:
29.9 moles
2C²H¹⁰ needs 13 moles of O²
4.6 C⁴H¹⁰ needs X moles of O²
X= 13× 4.6 ÷ 2 = 59.8 ÷ 2 = 29.9 moles
29.9 moles of O2 are required to react completely with 4.6 mol of C4H10.
2C²H¹⁰ needs 13 moles of O²
4.6 C⁴H¹⁰ needs x moles of O²
x= 13× 4.6 ÷ 2
= 59.8 ÷ 2
= 29.9 moles
What is a mole?A mole is described as the quantity of a substance that contains exactly 6.02214076 X1023 primary entities of the given substance. as a result, a mole of a substance is referred to as the mass of a substance containing the equal wide variety of essential gadgets as atoms in exactly 12.000 g of 12C.
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How many valence electrons does the following element have?
Whats the answer chemistry
Answer:
8
Explanation:
what happens when the temperature of gas is increased
Answer:
If you heat a gas you give the molecules more energy so they move faster.
Explanation:
which is one way that water helps living things?
a temperature regulation
b. oxygen transportation
c. heat absorption
d. nutrient production
What is nuclear fusion and what does it produce in a star?
Answer:
Energy
Explanation:
Nuclear fusion is the process of combining atoms to make heavier atoms. This releases a huge amount of energy and it is what stars like our sun use to create energy.
what is the iupac name of this compound. CH3-C H -CH2- CH3
how is coal usually used
Answer:
Coal is primarily used as fuel to generate electric power in the United States.
Explanation:
What may happen to the human body when exposed to an infectious agent?
A. When infectious agents get into the human body, your body responds by functioning normally.
B. When infectious agents get into the human body, the body gets a surge of energy, causing a slight increase in body temperature, and you feel great.
C. When infectious agents get into the human body, your body responds by raising the core body temperature, causing a fever.
D.Nothing happens when the human body is exposed to an infectious agent.
Answer:
when infectious agents get into the human body your body responds by raising the core body temperature causing a fever
The answer is C it will raise your body temp and cause a fever
Terry usually rides his bike at 15 mph. If his riding speed is reduced by 3 mph, how far can he ride in 1.7 hours? ___miles
Answer:
20.4 miles.
Explanation:
We know he usually rides his bike at 15mph, and if we subtract 3 from that we get 12 miles per hour. Now if we multiply by the amount of time (1.7 hours) we'll find our answer. 12 x 1.7 = 20.4
Answer:
20.4
Explanation:
I just had the question.
1.(03.02 LC)
Which of the following best defines weather? (3 points)
The atmospheric conditions at a particular time.
i did the test.
Answer:
the atmospheric conditions at a particulur time
Explanation:
What name should be used for the ionic compound Cu(NO3), ?
O copper nitrate
O copper(1) nitrate
copper(II) nitrate
O copper(III) nitrate
Answer:
copper nitrate
Explanation:
copper nitrate
Answer:
Copper (ll) nitrate or C
Explanation:
Which is an example of a beneficial mutation?
one that changes the color of a rabbit, allowing it to hide from predators.
one that results in lighter flower petal colors without changing the plant’s ability to reproduce
one that causes a person’s body to produce thick mucus that clogs the lungs
one that makes it easier for a corn plant to contract a disease
Answer:
A
Explanation:
Answer: a
Explanation: one that changes the color of a rabbit, allowing it to hide from predators.
Which of the following is an example of chemical weathering?
wind breaking down rock
plant roots splitting rocks
acid dissolving limestone
water breaking rocks
Answer:
the answer is C acid dissolving limestone
Explanation:
Answer:
the answer is C acid dissolving limestone
Explanation:
The chemicals in the water break down the rocks, so water breaking rocks is an example of chemical weathering :) Also, acids are a form of chemical weathering, as the chemicals dissolve the limestone :) Hope this helped!!