Answer:
0.83M is molarity of the solution
Explanation:
In a 5% w/v solution of vinegar there are 5g of acetic acid per 100mL of solution. Or 50g per liter of solution. As molarity is defined as the moles of the solute (Acetic acid) per liter of solution we need to convert the 50g per liter to moles per liter using molar mass of acetic acid:
Molarity:
50g/L * (1mol / 60.052g) = 0.8326moles/L =
0.83M is molarity of the solutionA student reacts 13 moles of iron with 21 moles of oxygen according to the following equation:
4Fe(s) + 3O2(g) +2Fe2O3(s)
How many moles of iron(III) oxide will the reaction produce?
a
34 moles
b
13 moles
c
6.5 moles
d
44 moles
Answer:
Explanation:
C
The limiting reactant in this reaction is Fe. 4 moles of Fe gives 2 moles of ferric oxide. Hence, 13 moles of Fe will give 6.5 moles of iron (iii)oxide.
What is limiting reactant ?The reactant which is not sufficient in amount determines the yield of the reaction and it is called the limiting reactant of the reaction.
In the given reaction, 4 moles of iron reacts with 3 moles of oxygen to give 2 moles of iron oxide.
given , no.of moles of oxygen gas present in the sample = 21 moles
no.of moles of Fe = 13 moles.
Here, 28 moles of Fe is needed to react with 21 moles of oxygen. Hence, Fe is the limiting reactant.
4 moles of Fe gives 2 moles of iron (III)oxide. Hence, number of moles of the product , formed from 13 moles of Fe is calculated as follows:
(13 moles ×2 moles)/4moles = 6.5m moles
Therefore, 6.5 moles of iron (III)oxide is formed from 13 moles of Fe.
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show the formation of Mgion and Oion.
Some bacteria cells make people sick by releasing large molecules called toxins that affect your bodies. What
process would a bacteria cell likely use to release such large molecules?
Answer: Exocytosis is the reverse of endocytosis. Quantities of material are expelled from the cell without ever passing through the membrane as individual molecules. By using the processes of endocytosis and exocytosis, some specialized types of cells move large amounts of bulk material into and out of themselves.
Explanation:
Answer: Toxins may function to establish productive colonization conditions and work by damaging host cell membranes, by inhibiting host cell protein synthesis, and by activating secondary messengers that adversely affect host cell function.
Explanation:
infectious bacteria can make you ill. They reproduce quickly in your body. Many give off chemicals called toxins, which can damage tissue and make you sick. Examples of bacteria that cause infections include Streptococcus, Staphylococcus, and E. coli.
WOW IM A NERD
Consider a reaction that connects the ends of a chain of carbons to form a ring. The closure of the ring results in the formation of a new chemical bond, with the bonding electrons going into a bonding sigma molecular orbital at a lower energy. Which of the following statements correctly describes the resulting enthalpy, entropy, and heat changes? Mark all that are correct.
A. The entropy of the surroundings decreases (AS surr < 0) because the closure of the ring results in fewer conformations for the system.
B. The system releases energy to the environment, because its internal energy decreases.
C. The entropy of the surroundings increases (AS surr > 0) because the surroundings absorb heat released by the reaction, and become more disordered.
D. The entropy of the system decreases (AS sys < 0) because the closure of the ring reduces the number of conformations the ring can adopt.
E. The enthalpy or internal energy of the system decreases (AH sys < 0) because the electrons that form the bond enter an orbital that is at a lower energy.
Answer:
The system releases energy to the environment, because its internal energy decreases.
The entropy of the surroundings increases (AS surr > 0) because the surroundings absorb heat released by the reaction, and become more disordered.
The entropy of the system decreases (AS sys < 0) because the closure of the ring reduces the number of conformations the ring can adopt.
The enthalpy or internal energy of the system decreases (AH sys < 0) because the electrons that form the bond enter an orbital that is at a lower energy.
Explanation:
Now we know that when a reaction is exothermic heat is given off. In this case, we have a reaction that connects the ends of a chain of carbons to form a ring. The bonding electrons now move into a lower energy bonding sigma molecular orbital.
This leads to a decrease in the entropy and enthalpy of the system because energy is given off, the closure of the ring reduces the number of conformations the ring can adopt and the electrons that form the bond enter an orbital that is at a lower energy.
The entropy of the surroundings is increased as energy is given out. The surroundings absorb heat released by the reaction, and become more disordered.
Earths outer core is made of ___
Answer:
iron and nickel (liquid metal )
Explanation:
The outer core is the third layer of the Earth. It is the only liquid layer, and is mainly made up of the metals iron and nickel, as well as small amounts of other substances. The outer core is responsible for Earth’s magnetic field. As Earth spins on its axis, the iron inside the liquid outer core moves around
Answer:
The outer core is the third layer of the Earth. It is the only liquid layer, and is mainly made up of the metals iron and nickel, as well as small amounts of other substances.
Explanation:
How many atoms are in 123 g of calcium
Answer:
Molar mass of Ca = 40 g / mol , given 123 g Ca is 123/40= 3.075 moles,
1 mole = 6.022 * 10^23 atoms, so 3.075 moles Ca= 18.51*10^23 atoms
Explanation:
The number of atoms present in 123 g of calcium is 18.51 x 10²³ atoms.
What is calcium?Calcium is an element present in the periodic table. It is very much needed for the strength of the bones and teeth.
"Molar mass of many compounds can be calculated by dividing the mass of the compound by the number of moles of the compound."
"The mole is a SI unit of measurement that is used to calculate the quantity of any substance".
First, calculate the moles
Moles = mass / molar mass
Molar mass of Ca = 40 g / mol
Given 123 g Ca is mass
123 / 40 = 3.075 moles,
1 mole = 6.022 x 10²³ atoms,
6.022 x 10²³ is the Avogadro number. It equals to one mole.
So 3.075 moles Ca= 18.51 x 10²³ atoms.
Thus, the number of atoms present in 123 g of calcium is 18.51 x 10²³ atoms.
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The diagram illustrates photosynthesis.
Which best describes what is happening in the area marked X?
Carbon dioxide enters the stem through xylem.
Oxygen enters the stem through stomata.
Water is carried to the leaves by stomata.
Water is carried to the leaves by xylem.
Answer:
I think Water is carried to the leaves by xylem.
Answer:
d
Explanation:
The increase in electro negativity when moving left to right on the periodic table can be explained by what?
Answer: Decrease in size
Explanation:
Electronegativity is defined as the property of an element to attract a shared pair of electron towards itself.
On moving across a period from left to right, the size of an atom decreases because the electrons get added to the same shell and the nuclear charge keeps on increasing. Thus the electrons get more tightly held by the nucleus.
As, the size of an element decreases, the valence electrons come near to the nucleus. So, the attraction between the nucleus and the shared pair of electrons increases. Thus electronegativity increases.
Which energy resource causes the greatest waste disposal concerns?
solar power
nuclear
coal
geothermal power
What is the difference between the structure of simple and complex carbohydrates?
Answer:
Simple carbs break down easier and contain sugars. Complex carbs contain starch and fiber.
Explanation:
Answer Image result for What is the difference between the structure of simple and complex carbohydrates?
Simple vs Complex Carbs. Carbohydrates are sugars that come in 2 main forms – simple and complex. This is also referred to as simple sugars and starches. The difference between a simple and complex carb is in how quickly it is digested and absorbed – as well as it's chemical structure.
Sound waves travel better through solid than through a gas. Example why this is true
Answer:
This is because molecules in a solid are packed against each other. When a vibration begins, the molecules of a solid immediately collide and the compression wave travels rapidly.
Explanation:
What kind of reaction is this? *
Na + C1, → NaCl
It’s a simple question in Welding when you use a torch if you add a lot of oxygen to the fuel what happens does it burn faster or what I want to know
Answer:
Easy, the flame is smaller but burns hotter.
Explanation:
Pls help me I’m having a hard day pls answer these?
Answer:the first one is D second one is A and the third one is A :D
Explanation:
DAE
On the first day of school, a class of fifth-grade students are given four identical cubos of hard clay. The cubes are placed in four different conditions until the last day of school. At that time, the students make the following
observations
Sample 1: classroom cabinetno noticeable changes
Sample 2 near a window lighter in color
Sample 3: freezer - small cracks near comers
Sample 4 bottle of water small amount of algae on top Which sample shows evidence of physical weathering?
Sample 1
Sample 2
оооо
C
Samples
Sample 4
Answer:
sample 3
Explanation:
i did this
Answer:
Sample 3
Explanation:
physical weathering means the breaking down of an object physically and the small cracks represent physical change.
Which of the following are made possible by energy transfer from the Sun? Choose all that apply.
A. biofuels
B. nuclear power using uranium
C. wind power
D. hydroelectric power using a dam
This is Really Science but I couldn’t find it but please help ASAP!
How many moles of O2 are needed to produce 2.5 moles of water?
Answer:
Mass of oxygen = 16 * 1.25 = 20 g
Explanation:
If a substance has a large mass and a small volume how dense is it
Answer:
Very dense.
Explanation:
Conceptually, you are taking a large amount of atoms and putting them into a small container. This means the spaces between atoms has to be smaller and the substance is more dense. (see image)
Mathematically, the equation for density is mass divided by volume ([tex]Density=\frac{m}{v}[/tex] ). If you divide a big number by a small number, you still have a pretty big number (ex 4/2=2 versus 6/1=6)
A reaction mixture in a 5.19 L flask at a certain temperature contains 26.9 g CO and 2.34 g H2. At equilibrium, the flask contains 8.65 g CH3OH. Calculate the equilibrium constant (Kc) for the reaction at this temperature.
Answer:
26.7
Explanation:
The reaction that takes place is:
CO + 2H₂ ↔ CH₃OHWe convert the given masses to moles, using their respective molar masses:
CO ⇒ 26.9 g ÷ 28 g/mol = 0.961 molH₂ ⇒ 2.34 g ÷ 2 g/mol = 1.17 molCH₃OH ⇒ 8.65 g ÷ 32 g/mol = 0.270 molThe initial concentrations for each species are:
CO ⇒ 0.961 mol / 5.19 L = 0.185 MH₂ ⇒ 1.17 mol / 5.19 L = 0.225 MCH₃OH ⇒ 0While the equilibrium concentration for CH₃OH, [CH₃OH]eq is:
0.270 mol / 5.19 L = 0.052 MWe put the data in a table:
CO + 2H₂ ↔ CH₃OH
initial 0.185 0.225 ↔ 0
eq (0.185 - x) (0.225-2x) ↔ x
We know that x = 0.052 M (That's the equilibrium concentration of CH₃OH).
We proceed to calculate [CO]eq and [H₂]eq:
[CO]eq = 0.185 - 0.052 = 0.133 M[H₂]eq = 0.225 - 2*0.052 = 0.121 MFinally we calculate the equilibrium constant:
Kc = [tex]\frac{[CH_3OH]_{eq}}{[CO]_{eq}([H_2]_{eq})^2}[/tex] = 26.7The equilibrium constant (Kc) for the reaction at this temperature is 26.7
Chemical reaction:CO + 2H₂ ⇄ CH₃OH
Conversion of moles:CO ⇒ [tex]\frac{26.9 g}{28 g/mol} = 0.961 mol[/tex]
H₂ ⇒ [tex]\frac{2.34 g }{ 2 g/mol} =1.17 mol[/tex]
CH₃OH ⇒ [tex]\frac{8.65 g}{32 g/mol} = 0.270 mol[/tex]
The initial concentrations for each species are:CO ⇒ [tex]\frac{0.961 mol}{5.19 L} = 0.185 M[/tex]
H₂ ⇒ [tex]\frac{1.17 mol}{5.19 L } = 0.225 M[/tex]
CH₃OH ⇒ 0
While the equilibrium concentration for CH₃OH, [CH₃OH]eq is:[tex]\frac{0.270 mol}{ 5.19 L} = 0.052 M[/tex]
We put the data in a table:
CO + 2H₂ ⇄ CH₃OH
Initial 0.185 0.225 0
Equilibrium (0.185 - x) (0.225-2x) x
x = 0.052 M (That's the equilibrium concentration of CH₃OH).
We proceed to calculate [CO]eq and [H₂]eq:
[tex][CO]_{eq}= 0.185 - 0.052 = 0.133 M\\\\\\[H_2]_{eq} = 0.225 - 2*0.052 = 0.121 M[/tex]
Calculation of equilibrium constant:[tex]K_c =\frac{[CH_3OH]_{eq}}{[CO]_{eq}[H_2_{eq}]^2} = 26.7[/tex]
Thus, the equilibrium constant (Kc) for the reaction at this temperature is 26.7
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Please help asap!!
A cooling curve has two flat lines, or plateaus. What does the plateau at the higher temperature represent?
Select one:
a. Increase in temperature of a liquid
b. Decrease in temperature of a gas
c. Condensation of a gas
d. Freezing of a liquid
A cooling curve has two flat lines, or plateaus. The plateau at the higher temperature represents condensation of a gas and the correct option is option C.
What is Cooling curve?
When a solid substance is heated until it is completely melted, and then heated further and allowed to cool slowly, the curve obtained by plotting temperature against time is known as the cooling curve.
The gradient of the cooling curve is related to the heat capacity, the thermal conductivity of the substance, and the external temperature. The more heat is required to change the temperature of the substance, the slower it cools, so the smaller the gradient of the curve. The higher the thermal conductivity, the faster heat is transferred, so the faster the substance cools.
Therefore, A cooling curve has two flat lines, or plateaus. The plateau at the higher temperature represents condensation of a gas and the correct option is option C.
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2021 by Mrs. Groves Closes at 2/9/2021, 12
Which layer of Earth is divided into plates?
Mantle
Crust
Inner core
Outer core
Answer:
It would be the Mantle,I believe
Energy can generally be considered to be either kinetic energy or potential energy. Some specific forms of energy, such as
electrical, magnetic, and gravitational energy, can operate in the space around objects and affect other objects that come near. In
these examples
A. energy is continuously created.
B. energy is continuously destroyed.
C. energy exists in a field.
D. all of these
Answer:
d hope it's right hope this helps
Answer:
Energy exists in a field.
Explanation:
Electrical field, magnetic field, and gravitational field.
A and B are wrong otherwise the law of conservation of energy would be violated
ecology is the study of what
Answer:
Relative organisms
Explanation:
Ecology is a branch of biology that deals with the relations of organisms to one another and to their physical surroundings and conditions.
hope this helps:)
Sound waves are longitudinal, mechanical, compression waves.
A. True
B. False
Answer:
True
Explanation:
Sound waves traveling through air are indeed longitudinal waves with compressions and rarefactions. As sound passes through air (or any fluid medium), the particles of air do not vibrate in a transverse manner.
Answer:
true
Explanation:
ape x
Which two climates have very low levels of precipitation
A dry and polar
B polar and highlands
C highlands and temperate marine
D temperature marine and temperature continental
Answer:
B highlands and polar, very little percipitation is found in polar regions, and high lands contributes to that
Explanation:
Answer:
B!
Explanation:
got it right on quiz. edu2021
1. A gas has a volume of 5.30 mL and a mass of 24.10 grams. What is the
density?
Answer:
4.5472g/ml rounded of to 4 s.f
Explanation:
Density= Mass/ Volume
what happens when you continue to add a solute to an already saturated solution
Answer: nothing. It remains undissolved
Explanation: saturated = dissolved as much solute as solvent can contain
3. A gram food sample is burned completely in a calorimeter that contains 1000. of water The temperature of the water increases 23.65 degrees * C . How many Calories does the food have per gram ?
The food has 23629.64 cal
Further explanationGiven
mass = 1000 g of water
temperature increases 23.65 * C
Required
The energy of the food
Solution
Heat absorbed by water :
Q = m . c . Δt
Q = 1000 g x 4.184 J/g°C x 23.65 °C
Q = 98951.6 J
1 Joules = 0.2388 Calories
98951.6 J = 23629.64 cal
In the presence of an acid catalyst, cyclohexanol (100.16 g/mol) is dehydrated to give cyclohexene (82.14 g/mol) and water. Reaction scheme illustrating the dehydration of cyclohexanol in the prescence of acid catalyst to cylcohexene and water. A dehydration reaction starting with 4.1 g cyclohexanol produces 3.0 g cyclohexene. Calculate the percent yield for this reaction. Report your answer with two significant figures.
Answer:
88%
Explanation:
Step 1: Write the balanced equation
C₆H₁₁OH ⇒ C₆H₁₀ + H₂O
Step 2: Calculate the moles corresponding to 4.1 g of C₆H₁₁OH
The molar mass of C₆H₁₁OH is 100.16 g/mol.
4.1 g × 1 mol/100.16 g = 0.041 mol
Step 3: Calculate the theoretical yield, in moles, of C₆H₁₀
The molar ratio of C₆H₁₁OH to C₆H₁₀ is 1:1. The theoretical yield of C₆H₁₀, in moles, is 1/1 × 0.041 mol = 0.041 mol.
Step 4: Calculate the mass corresponding to 0.041 moles of C₆H₁₀
The molar mass of C₆H₁₀ is 82.14 g/mol.
0.041 mol × 82.14 g/mol = 3.4 g
Step 5: Calculate the percent yield of C₆H₁₀
We will use the following expression.
percent yield = experimental yield/theoretical yield × 100%
percent yield = 3.0 g/3.4 g × 100% = 88%
How many grams of moles are in 94.2 g of C02?
Answer:
Moles to grams carbon dioxide
1 mole is equal to 1 moles Carbon Dioxide, or 44.0095 grams.
Explanation:
Moles to grams carbon dioxide
1 mole is equal to 1 moles Carbon Dioxide, or 44.0095 grams.