Answer:
See explanation
Explanation:
Hypatia is popular for her work in mathematics. She also did some work in the area of astronomy. Her well know work in mathematics is her ideas about conic sections.
She was born the Theon of Alexandria and she was a professional mathematician in her life time.
She was the greatest mathematician of her time and she was telling leader of the Neoplatonist school of philosophy in Alexandria. By so doing, she conquered the culture of sexism in her time.
She was trained by her father in mathematics and eventually replaced him. She was the last major mathematician in the Alexandrian tradition.
A sample of lithium has a mass of 0.0624 grams. How many atoms are present in this sample?
Answer:
[tex]5.412*10^{23}[/tex]
Explanation:
We can find the moles of lithium by doing 0.0624 divided by the molar mass of lithium (which is 6.941). Then, we can multiply that number by 6.02*10^23 which is the avogadro number. Then, we get our answer.
Suppose you produce 0.0451 g of N 2 gas with a volume of 0.0413 L and a pressure of 0.991 atm at 298 K. Based on the experimental data, what is the value of the gas constant R ?
Ideal gas law is valid only for ideal gas not for vanderwaal gas. Therefore, value of the gas constant R is 0.0821LatmK⁻¹ when volume is 0.0413 L.
What is ideal gas equation?
Ideal gas equation is the mathematical expression that relates pressure volume and temperature.
Mathematically the relation between Pressure, volume and temperature can be given as
PV=nRT
where,
P = pressure of nitrogen gas = 0.991 atm
V= volume of nitrogen gas =0.0413 L
n =number of moles of nitrogen gas = given mass ÷Molar mass
=0.0451 g ÷28
=0.0016mol
T =temperature of nitrogen gas =298 K
R = Gas constant =?
0.991 atm×0.0413 L=0.0016×R×298 K
R=0.0821LatmK⁻¹
Therefore, value of the gas constant R is 0.0821LatmK⁻¹.
To learn more about ideal gas equation, here:
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What does this image represent?
a) alcohol group
b) carbonyl group
c) ether group
d) hydroxyl group
Explanation:
It represent Alcohol group (—OH)
Question: Describe how molecules would
move in a piece of ice.
Answer:
The molecules in the liquid are moving past one another. The hydrogen end of one water molecule is attracted to the oxygen end of another but only for a short time because they are moving. The molecules in ice are further apart than in liquid water. The molecules in ice are in fixed positions but still vibrate.
Explanation:
PLEASE I NEED HELP WITH CHEMISTRY PLEASE ????????
There's no question..
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Answer:
Kinetic Energy is the correct Answer.
Explanation:
At the highest point on the roller coaster (assuming it has no velocity), the object has a maximum quantity of gravitational potential energy. As the object begins moving down to the bottom, its gravitational potential energy begins to decrease and the Kinetic Energy starts to increase.
HELP HELP
why are more common bone fractures among senior citizens than among young people
3. What is the Limiting Reactant in the following equation if you start with 3 moles of NH3 with 6 moles of O2?
4NH3 (g) + 5O2 (g) 4NO (g) + 6H2O(g)
4. How many grams of NO can be made from the previous equation and quantities?
Answer:
3. NH3 is limiting
4. 90 g NO
Explanation:
3. To find the limiting reactant, you have to convert from moles of reactant to moles of product. In this case, because we need to know how many grams of NO in the second question, we will use NO as our product. We use the ratios found in the chemical formula.
[tex]3 mol NH3*\frac{4 molNO}{4 mol NH3} = 3molNO[/tex]
[tex]6 mol O2*\frac{4 molNO}{5 mol O2} = 4.8molNO[/tex]
Because NH3 makes less moles of NO, it is the limiting reactant.
4. Now we need the molar mass to convert the moles of NO into grams of NO. The molar mass of NO is 30.01g/mol. This is the equation.
[tex]3 mol NO*\frac{30.01g NO}{1 mol NO} = 90.03gNO[/tex]
Because there are is only one significant figure in the original numbers, we round to one significant figure = 90 g NO.
Calculate the mass of glucose metabolized by a 60.0 −kg person in climbing a mountain with an elevation gain of 1550 m . Assume that the work performed in the climb is about four times that required to simply lift 60.0 kg by 1550 m . (ΔfH∘ of C6H12O6(s) is -1273.3 kJ/mol.) w = mgh (mass in kg, g = 9.8 m/s2, h in meters)
Answer:
Mass of glucose = 515.34 g
Explanation:
We are given;
Mass; m = 60 kg
Elevation; h = 1550 m
Acceleration due to gravity; 9.8 m/s²
Now, work performed to lift 60kg by 1550m is given by the formula;
W = mgh
W = 60 × 9.8 × 1550
W = 911400 J
We are told the actual work is 4 times the one above.
Thus;
Actual work = 4W = 4 × 911400 = 3,645,600 J
Now,
Molar mass of Glucose(C6H12O6) = 180 g/mol
We are given standard enthalpy of combustion = -1273.3 KJ/mol = -1273300
Moles of glucose = 3645600/1273300 = 2.863mol
Mass of glucose = 2.863 mol × 180 g/mol
Mass of glucose = 515.34 g
How do balanced chemical equations thon the
conservation of mass?
They show that the atoms in the products
may be different than the readarts as long
as the mass does not change,
They show that the atoms in the products are
the same as in the reactants, but the number
of atoms must change,
They show that the number of atoms of each
element is the same in the products and
reactants
Answer:
They show that the number of atoms of each element is the same in the products and reactants
Explanation:
Balanced chemical equations show the conservation of mass in that the number of atoms of each element is the same in the products and reactants.
In balancing chemical equation, the idea is to conform with the law of conservation of mass. It states that "during a chemical reaction, atoms are neither created nor destroyed but they simply combine to form new products". In chemical reaction, the atoms are still the same but new compounds ensue. The atoms still maintain their number.Answer:
C (They show that the number of atoms of each element is the same in the products and reactants.)
For the next question: C (2H2(g) + O2(g) → 2H2O(g))
Explanation:
For Edge
I2(g) + Br2(g) ↔ 2 IBr(g) What is the equilibrium concentration of IBr (in M to 4 decimal places) if 0.200 mol of I2 and 0.100 mol Br2 in a 5.00 L vessel if Kc = 29 at 150°C?
Answer:
The equilibrium concentration of IBr is 0.0360 M or 0.1032 M
The equilibrium concentration of IBr is 0.752 mol
Explanation:
Mathematically, concentration = number of moles/volume
For Iodine molecule, concentration = 0.2/5 = 0.04 M
For the bromine molecule, concentration = 0.1/5 = 0.02 M
We need to set up an ICE table ( Initial, change, equilibrium) to get the concentrations of the molecules at equilibrium.
Please check this table in the attachment.
From the table, we can see that the equilibrium concentration of Iodine is (0.04-x), that of Bromine is (0.02-x) while that of IBr is 2x
Now, we need to get the equilibrium constant using the equilibrium concentration of the molecules
With the given chemical reaction, we can represent the equilibrium constant in terms of pressure as follows;
Kc = [IBr]^2/[Br2][I2]
Thus;
Kc = (2x)^2/(0.04-x)(0.02-x)
Kc = 4x^2/(0.04-x)(0.02-x)
From the question, Kc = 29 , so substitute this;
29 = 4x^2/(x^2-0.06x+0.008)
Cross multiply
29((x^2-0.06x+0.008) = 4x^2
29x^2 - 1.74x +0.0232 = 4x^2
Thus;
25x^2 - 1.74x + 0.0232 = 0
Solving this quadratic equation, we get two values for x which are x = 0.0516 and 0.0180
The equilibrium concentration is either (2 * 0.018) or (2 * 0.0516) which is 0.0360 or 0.1032
As you are cleaning out the shared refrigerator in the kitchen of your apartment at the end of the school year, you find an unlabeled, clear plastic container in the back, left there by one of your roommates. This container is half-filled with something that you notice has separated into two layers: the top one is a dark yellow color, the bottom layer is more greenish. You assume that this biphasic mixture has an aqueous layer and some type of organic layer. Without tasting, smelling, or removing either layer from the container, how can you determine which layer is the aqueous layer using just material found in a typical kitchen
Answer:
See explanation
Explanation:
The organic layer is always found at the top of the mixture while the aqueous layer is found at the bottom of the mixture.
Therefore, if I use any piece of rod and an empty container found in the kitchen to perform a simple decantation, the top layer that comes out first is the organic layer. The other layer that remains after the top layer has been successfully decanted is the aqueous layer.
Unknown element has two isotopes. Isotope A has a mass of 34 amu and abundance of 52%, isotope B has a mass of 33 amu and abundance of 48%. Find average atomic mass of this element and express your
Answer:
x = 33.52 amu
Explanation:
It is given that,
Isotope A has a mass of 34 amu and an abundance of 52%, isotope B has a mass of 33 amu and an abundance of 48%.
Let x is the average atomic mass of this element. It can be calculated as follows :
[tex]x=52\%\ \text{of}\ 34+48\%\ \text{of}\ 33\\\\x=\dfrac{52}{100}\times 34+\dfrac{48}{100}\times 33\\\\x=0.52\times 34+0.48\times 33\\\\x=33.52\ \text{amu}[/tex]
So, the average atomic mass of this element is 33.52 amu.
Write a balanced equation for the double-replacement precipitation reaction described, using the smallest possible integer coefficients. A precipitate forms when aqueous solutions of lead(II) nitrate and sodium hydroxide are combined.
Answer: [tex]Pb(NO_3)_2(aq)+2NaOH(aq)\rightarrow 2NaNO_3(aq)+Pb(OH)_2(s)[/tex]
Explanation:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
The balanced chemical equation for a precipitate forms when aqueous solutions of lead(II) nitrate and sodium hydroxide are combined is:
[tex]Pb(NO_3)_2(aq)+2NaOH(aq)\rightarrow 2NaNO_3(aq)+Pb(OH)_2(s)[/tex]
Sustainable forestry is managing forests so they harvested regularly without harming or reducing the future supply of timber. What is one practice you might observe in a sustainably-managed forest?
A) clear cutting
B) selective cutting
C) land reclamation
D) crop rotation
Answer:
I think option D
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What is the value of E0 for the spontaneous reaction resulting from a suitable combination of these half reactions?
Standard Potentials E0
Fe2+ --> Fe3+ + e- -0.77 V
2Hg --> Hg2+ + 2e- -0.79 V
a. +0.02 V.
b. +0.36 V.
c. -1.56 V.
d. -0.02 V.
e. +1.56 V.
Answer:
+0.02 V
Explanation:
For the reaction to be spontaneous, iron must be the cathode and Mercury the anode
Given that the standard cell potential is obtained from;
E°=E° cathode - E° anode
Since;
E° cathode = -0.77V
E° anode = 0.79 V
E°cell = -0.77 -(-0.79)
E°cell = +0.02 V
Which of the following is NOT an example of deposition?
sand dune
river delta
cave crystal
valley
This science btw
Answer:
Cave Crystal
Explanation:
I believe it's cave crystal because sand dunes, river deltas, and valleys are all examples of deposition.
Compare ionic, covalent, and metallic bonds based on each's strength
Answer:
Covalent bond involves the sharing of electrons, while metallic bonds have strong attractions and ionic bonds involve the transferring and accepting of electrons from the valence shell. The adhering property of an atom, in order to arrange themselves in a most stable pattern by filling their outermost electrons orbit
Explanation:
hope it helps:)
when a neutral atom gains or loses electrons, it becomes charged and is called a
Answer:
Ion
Explanation:
Answer:
Conclusión. Los cationes son iones con carga positiva que se forman cuando los átomos neutros pierden electrones; los aniones son iones con carga negativa que se forman cuando átomos neutros ganan electrones.
Explanation:
A certain compound is made up of three chlorine atoms, one phosphorus atom, and one oxygen atom. What is the chemical formula of this compound
Answer:
POCl3
Explanation:
A compound is a substance made up of atoms of different elements. The number of atoms each element posseses make up the chemical formula of the compound. In this question, a certain compound is made up of three chlorine atoms (Cl3), one phosphorus atom (P), and one oxygen atom (O).
Combining these atoms of different quantity together, this means that the compound will have a chemical formula: POCl3. This compound is called phosphorus oxychloride.
Georgia discovered a piece of metal. She measured its mass as 14 grams and its volume as 2 cm3. Georgia then compared the metal she found with the metals in the table below.
DENSITY OF METALS
Which type of metal did Georgia most likely find?
A.Gold
B.Lead
C.Silver
D.Zinc
Answer:
try dividing the grams and the volume and see what number matches up with your answer
Explanation:Five moles of sulfur dioxide, soz, would consist of how many molecules?
molecules
Need Help?
Answer:
3 x 10²⁴ molecules
Explanation:
A mole is just a name that we use to substitute a number, just like a dozen means 12, a mole means 6.022 x 10²³. This gives us the unit conversion of 6.022 x 10²³ molecules SO₂/1 mol SO₂.
[tex]5molSO2*\frac{6.022 x 10^2^3molecules}{1mol SO2} = 3.011 x 10^2^4moleculesSO2[/tex]
Round to the lowest number of significant figures to get 3 x 10²⁴ molecules SO₂
PLEASE HELP! WILL DO BRAINLIEST! What do scientists call all of the compounds that contain carbon and are found in living things?
organic
inorganic
acidic
nonacidic
Answer:
acidic because of electrical issues and the body of electrical equipment
The half-life of cesium-137 is 30 years. Suppose that we start with 70 grams of cesium-137 in a storage pool. How many half-lives will it take for there to be 10 grams of cesium-137 in the storage pool?
Answer:
Explanation:
Let n be number of half lives taken .
10 = 70 x ( 1/2 )ⁿ
1/7 = ( 1/2 )ⁿ
2ⁿ = 7
n ln2 = ln 7
n = ln7 / ln2
= 1.9459 / .693
= 2.8
So 2.8 half lives will be required .
Assume that the inspired air is dry air. The vapor pressure of 47 mmHg at 37°C corresponds to a volume and mass of liquid water. If the tidal volume is 500 mL and respiration rate is 12 min−1, how much water is lost from the body per day? Would you expect this to increase or decrease with activity?
Answer:
Water lost per day will be "378 g".
Explanation:
The volume of air expired per a day will be:
= [tex]12\times 500[/tex]
= [tex]8640 \ L[/tex]
As we know,
The ideal gad law equation will be:
⇒ [tex]PV = nRT[/tex]
⇒ [tex](\frac{47}{760} )\times 8640= n\times 0.082\times 310[/tex]
⇒ [tex]n=21\times 18[/tex]
⇒ [tex]n=378 \ g[/tex]
The oxidation of glucose to carbon dioxide and water is represented by the following reaction, whether the oxidation occurs by combustion in the laboratory or by biological oxidation in living cells: C6H12O6+6O2⇌6CO2+6H2O When combustion is carried out under controlled conditions in the laboratory, the reaction is highly exothermic, with an enthalpy change (ΔH) of −673kcal/mol. As you know, ΔG for this reaction at 25∘C is −686kcal/mol, so the reaction is also highly exergonic. Part A Explain what the ΔH and ΔG values mean. What do the negative signs mean in each case? Drag the terms on the left to the appropriate blanks on the right to complete the sentences. Terms can be used once, more than once, or not at all.
Answer:
See explanation
Explanation:
∆H is known as the change in enthalpy. When the change in enthalpy is negative, it simply means that heat is given out during the reaction. Therefore, we refer to the reaction as an exothermic reaction.
Similarly, ∆G is known as change in free energy. When the change in free energy is negative, it implies that the reaction is spontaneous as written. This is called an exergonic reaction.
Which profile best shows the topography alone line AD
Lewis based his theory of bonding on? Is this correct
What is the mass, in grams, of 8.65 x 1025 atoms of oxygen?
Answer:
Mass = 2304 g
Explanation:
Given data;
Number of atoms of oxygen = 8.65×10²⁵
Mass in gram = ?
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
For example,
1 mole = 6.022 × 10²³ atoms
8.65×10²⁵ atoms of oxygen× 1mol /6.022 × 10²³ atoms
1.44×10² mol
144 mol
Mass in grams of oxygen:
Mass = number of moles × molar mass
Mass = 144 mol × 16 g/mol
Mass = 2304 g
A certain chemical reaction releases of heat for each gram of reactant consumed. How can you calculate the heat produced by the consumption of of reactant? Set the math up. But don't do any of it. Just leave your answer as a math expression. Also, be sure your answer includes all the correct unit symbols.
Complete Question
The complete question is shown in the first uploaded image
Answer:
So the math expression is
[tex]heat = \frac{ 35. 7 KJ * 1900 \ gram }{ 1 \ gram }[/tex]
Explanation:
From the question we are told that
The heat released for 1 gram of reactant consumed is [tex]H = 37.5 \ KJ/g [/tex]
The mass of reactant considered is [tex]m = 1.9 \ kg = 1900 \ g[/tex]
So if
[tex]37.5 \ KJ [/tex] is produced for 1 gram
Then
x kJ is produced for 1900 g
=> [tex]x = \frac{ 35. 7 KJ * 1900 \ gram }{ 1 \ gram }[/tex]
So the heat released is
[tex]heat = \frac{ 35. 7 KJ * 1900 \ gram }{ 1 \ gram }[/tex]
