Answer: Bubbles, burning, odor, color change, and rusting.
Explanation: Chemical changes are changes to something that is irreversible.
Solid aluminum and oxygen gas react to form solid aluminum oxide. Suppose you have 3.0 mol of Al and 11.0 mol of O2 in a reactor. Suppose as much as possible of the reacts. How much will be left? Round your answer to the nearest 0.1 mol.
8.75 moles of oxygen will be left
The reaction is
Al(s) + O₂(g) -----> Al₂O₃(s)
On balancing the equation, we get:
4Al(s) + 3O₂(g) -----> 2Al₂O₃(s)
If 3 mol of Al reacts, we need 3/4 x 3 = 9/4 = 2.25 mol of oxygenIf 11 mol of oxygen reactions, we need 11/3 x 4 = 44/3 = 14.7 mol of AluminiumBut we only have 3 mol of AlAluminium is the limiting reagent and all 3 moles of Al will reactWe get 2 moles of aluminium oxide from 4 moles of aluminium. So from 3 moles of aluminium, we get:3/4 x 2 = 6/4 = 1.5 moles of aluminium oxide
If we use 4 moles of Al, we need 3 moles of oxygenSo when we use 3 moles of Al, we need3/4 x 3 = 9/4 = 2.25 mol of oxygen
We had 11 moles of oxygenThe amount of oxygen left = 11-2.25 = 8.75 mol8.75 moles of oxygen will be left
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deduce the molecular formula of hydrogen 18.2%, carbon 81.8%, relative molecular mass is 44
Answer:
let number of carbon is an
Explanation:
hence 12 and + 2n is equal to 126
14 and is equal to 126
n is equal to 9
In an endothermic reaction products are _____ in potential energy and _____ stable than reactants.
higher; more
lower; more
higher; less
lower; more
In an endothermic reaction, products are higher in potential energy and less stable than reactants.
What is an endothermic reaction?Endothermic reactions are those reactions that do not release heat but absorb heats, that's why the products are of higher potential energy and due to this they are less stable.
Thus, the correct option is C, higher; less.
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You are trying to determine the
freezing point for a 0.195 m
baqueous solution of K₂S.
How many particles does K2S
dissociate into?
From the equation; there are three particles in solution.
What is freezing point?The term freezing point is the temperature at which a liquid substance is converted to solid. We know that this is colligative property thus it depends on the number of particles in solution.
The dissolution of K₂S gives us;
K₂S(s) ----> 2K^+(aq) + S^2-(aq)
This implies that there are three particles in solution.
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Write the half reaction equations at the cathode and anode
A redox reaction is one in which oxidation and reduction occurs.
What is a redox reaction?A redox reaction is one in which oxidation and reduction occurs. Oxidation involves electron loss while reduction involves electron gain.
For the compound NaI;
The oxidation half equation is - 2Na(s) --->2Na^+(aq) + 2e
The reduction half equation is - I2 + 2e ---->2 I^-(aq)
Missing parts:
Write the anode half-reaction and cathode half-reaction for NaI.
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For the function F(x) = 1, which of these could be a value of F(x) when x is
close to zero?
Answer:
A. -10,000
Explanation:
When x approaches zero, the graph tells us that F(x) either becomes extremely large or extremely small. The best answer is therefore A: -10,000. Best, because we aren't given the exact value of x, but clearly the other results require that x be greater than 1 or less than -1, which is far from zero.
Which word equation best describes the following formula equation:
4Al+3O2→2Al2O3?
A. Four molecules of aluminum and three molecules of diatomic oxygen react to form two molecules of aluminum oxide.
B. Four molecules of aluminum react with six molecules of oxide to form twelve molecules of aluminum oxide.
C. Two molecules of aluminum oxide reacts to form three molecules of oxygen and four molecules of aluminum.
D. Aluminum reacts with oxide to form aluminum oxide.
Option A is the correct answer that describes the equation best as compared to other statement.
Which statement best describes the equation?Four molecules of aluminum and three molecules of diatomic oxygen react to form two molecules of aluminum oxide is the statement best describes the equation because this statement have same number of molecules that reacted in the equation. We considered an equation correct that have wrong numbers in front of atoms.
4Al+3O2------------>2Al2O3
So we can conclude that option A is the correct answer that describes the equation best as compared to other statement.
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Scientists used alpha particles to investigate models of the atom. Figure 4 shows an alpha particle scattering experiment.
Explain how scientists used the results from the experiment to :
disprove the plum pudding model
give evidence for the new nuclear model
Answer:
See attached image.
Explanation:
write the transitional metals and their electronic configuration
Answer:
yo no se nada
Explanation:
solo se que no se nada xd
A box has dimensions of 2.5 cm by 3.0 cm by 4.0 cm. The volume of the box in milliliters and liters is Group of answer choices 3,000 mL and 3.0 L 30 mL and 30,000 L 7.5 mL and 7,500 L 30 mL and 0.030 L 7.5 mL and 0.0075 L
Considering the definition of volume, the volume of the box is 30 mL or 0.03 L.
What is volumeVolume is a metric magnitude that is defined as the extension in three dimensions of a region of space. In other words, it is defined as the amount of space occupied by the object or figure in three-dimensional space. Volume is measured in cubic units.
Volume can be considered as the capacity of a container to hold a quantity of fluid (gas or liquid).
Volume of a boxA box is a rectangular prism, which is defined as a prism with rectangular bases and rectangular lateral faces.
The volume of this prism depends on its three dimensions and is calculated as the multiplication of these dimensions:
Volume= Dimension 1× Dimension 2× Dimension 3
Volume of the box in this caseIn this case, you know that a box has dimensions of 2.5 cm by 3.0 cm by 4.0 cm. So, the volume can be calculated as:
Volume= 2.5 cm× 3 cm× 4 cm
Solving:
Volume= 30 cm³
Being 1 cm³= 1 mL and 1 L= 1,000 mL then:
Volume= 30 cm³= 30 mL= 0.03 L
Finally, the volume of the box is 30 mL or 0.03 L.
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A 2. 75-l container filled with co2 gas at 25°c and 225 kpa pressure springs a leak. When the container is re-sealed, the pressure is 185 kpa and the temperature is 10°c. How many moles of gas were lost?.
Answer:
Moles Lost = 0.0335 moles
Explanation:
This type of question requires the Ideal Gas Law equation. The equation looks like this:
PV = nRT
In this formula,
-----> P = pressure (kPa)
-----> V = volume (L)
-----> n = number of moles
-----> R = constant (8.314 L*kPa/mol*K)
-----> T = temperature (K)
(Step 1)
To find how many moles were lost, you first need to find how many moles you had to begin with. This can be done by plugging the starting values into the equation and solving for "n". But first, you need to convert Celsius to Kelvin (by adding 273.15).
P = 225 kPa R = 8.314 L*kPa/mol*K
V = 2.75 L T = 25°C + 273.15 = 298.15 K
n = ?
PV = nRT
(225 kPa)(2.75 L) = n(8.314 L*kPa/mol*K)(298.15 K)
618.75 = n(2478.8191)
0.250 = n
(Step 2)
Next, you need to find the number of moles in the container after it has been re-sealed. The volume is the same because the container did not change. The process should be the same as above.
P = 185 kPa R = 8.314 L*kPa/mol*K
V = 2.75 L T = 10°C + 273.15 = 283.15 K
n = ?
PV = nRT
(185 kPa)(2.75 L) = n(8.314 L*kPa/mol*K)(283.15 K)
508.75 = n(2354.1091)
0.216 = n
(Step 3)
Finally, you can find the number of moles lost by subtracting the final amount of moles from the original amount. When doing this calculation, I used the value of the moles saved in my calculator (with more decimal places) to get a more accurate number.
Moles Lost = Initial Moles - Final Moles
Moles Lost = 0.250 moles - 0.216 moles
Moles Lost = 0.0335 moles
eggs do not contain sugar. Explain why they have such high energy values.
Answer:
becuz they have protien inside them dumy its easy
Answer:
because they have protein inside them dummy its easy therefore they did not have sugar
Explanation:
what is electron
and the unit
Which is not a characteristic of a compound?
has different properties from its component elements
different samples have different properties
can be represented by a chemical formula
a pure substance made of two or more elements
Which would be a good use for an organic substance? Check all that apply. A. Electrical conductors B. Waterproof coatings C. Fuels such as gasoline D. Microchips E. Plastic storage containers
Answer:
B. waterproof coatingExplanation:
please mark me brainlistAn ice freezer behind a restaurant has a freon leak, releasing 31.68 g of C2H2F3Cl into the air every week. If the leak is not fixed, how many kilograms of fluorine will be released into the air over 6 months
The weight of fluorine released in to the air over 6 month will be 0.365 kg
What is Freon ?
Freon is a non-combustible gas that is used as a refrigerant in air conditioning applications.
This freon undergoes an evaporation process over and over again to help produce cool air that can be circulated throughout your AC system
Total number of weeks = 6 x 4 = 24
Mass leak rate of freon = 31.68 g/week
Mass leak rate of flourine = fluorine mass in freon / molecular mass of freon x leak rate
= 19 x 3 / 118.5 x 31.68
= 15.23 gm/week
Total fluorine leak in 6 month = 15.23 x 24 = 365.72 gm = 0.365 kg
Hence, The weight of fluorine released in to the air over 6 month will be 0.365 kg
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Does this equation show that transmutation has taken place during decay? why or why not?
61/28 ni=61/28 ni + y
a. yes, because the numbers of nucleons and atoms are conserved
b. no, because high-energy electromagnetic waves are emitted
c. no, because there is conservation of the number of atoms as well as the number of nucleons
d. yes, because nickel atoms remain nickel atoms with the same number of neutrons
The equation is not a transmutation because there is conservation of the number of atoms as well as the number of nucleons; option C.
What is transmutation?Transmutation refers to the artificial synthesis of new elements by a nuclear reaction of the original element and nuclear particles.
In transmutation, a new element is formed and the atomic number changes.
Based on the above, it can be concluded that the given equation is not a transmutation because there is no change in atomic and nucleon number.
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Please select the word from the list that best fits the definition
Rock that is formed from the remains of older rocks and organisms
Super position
Radioactive dating
Sedimentary
Igneous
Metamorphic
Rock Cycle
A compound has an empirical formula C₂H4S.
What is its molecular formula, if its molar
mass is 168 g/mol?
This means that the molar mass of [tex]\text{C}_{2}\text{H}_{4}\text{S}[/tex] is
[tex]2(12.011)+4(1.00794)+32.06=60.11376[/tex]
Dividing this by the given molar mass, we get [tex]\frac{168}{60.11376} \approx 3[/tex]
So, the molecular formula is about [tex]\boxed{\text{C}_{6}\text{H}_{12}\text{S}_{3}}[/tex]
Help!!!!!!!!!!!!!!!!
Answer:
the mixture two is the Heterogeneous solution and the mixture 1 (sugar solution) is true solution
Explanation:
Heterogeneous solutions are solutions with non-uniform composition and properties throughout the solution. A solution of oil and water, water and chalk powder and solution of water and sand, etc.
True solution
The sugar solution is a mixture of sugar and water which is a true solution. True Solution is a homogeneous mixture of two or more materials with a particle size of less than 10-9 m or 1 nm dissolved in the solvent.
A solute is a substance to be dissolved.
The solvent is the one in which solute is dissolving.
In the sugar solution sugar is the solute and water is the solvent.
Answer:
Explanation:
your cool
b) Explain what happens when a drop of concentrated sugar solution is placed on a rheo leaf peel mounted on a glass slide. Name this phenomenon. Would the same happen if the rheo leaf was boiled before mounting? Give reason for your answer
The rheo leaf peel will lose water by osmosis and become flaccid. If the rheo leaf was boiled, this would not happen.
What is osmosis?Across living membranes, water moves from a region of high to a region of low water potential.
Concentrated sugar solutions have low water potential when compared to the cell sap of the cells of rheo leaf peel. Thus, water will move from the rheo leaf peel to the sugar solution.
This will result in the wilting of the leaf peel.
If the leaf peel is boiled, the membranes in the cells die and can no longer function as a selectively permeable interface.
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Calculate the root mean square velocity of I2(g) at 373 K.
From the calculations, the root mean square speed is 6.1 m/s.
What is the root mean square speed?The root mean square speed of a gas is obtained by the use of the formula;
V rms = √3RT/M
Where;
R = gas constant
T = temperature
M = molar mass
V rms =√3 * 8.314 * 373/254
V rms =6.1 m/s
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A+gas+at+250k+and+15atm+has+a+molar+volume+12%+less+than+the+perfect+gas+law+character. +calculate+the+compressibility+factor
The compression factor based on the information given is 0.083.
How to calculate the compression factor?The way to calculate the compression factor goes this:
V(ideal) = RT/P
= (0.0821 × 250)/15
= 1.368
V(real) will be:
= V(ideal)/12
= 1.368/12 = 0.114
The compression factor will be:
= 1.368/(12 × 1.368)
= 0.083
Therefore, the compression factor is 0.083.
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Arrange these elements into a table showing metals and non-metals: phosphorus, P, barium, Ba, vanadium, V. mercury, Hg, krypton, Kr, potassium, K, and uranium, U.
...,...................................
According to Le Châtelier's principle, an increase in temperature will shift the equilibrium position toward the products in an endothermic reaction.
True
False
The statement "According to Le Châtelier's principle, an increase in temperature will shift the equilibrium position toward the products in an endothermic reaction" is definitely true.
What is Le Châtelier's principle?Le Châtelier's principle may be defined as transformations in the temperature, pressure, volume, or concentration of a system that will lead to observable and conflicting changes in the strategy in order to accomplish a refreshed equilibrium state.
According to Le Châtelier's principle, an increase in temperature generates the equilibrium to move in the direction of the product of the endothermic reaction, and the decrease in the temperature rationales the equilibrium to move in the direction of the product of the exothermic reaction.
Therefore, it is well described above.
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N₂ + 3H2 → 2NH3
224 L of nitrogen reacts with
excess hydrogen at 2773 K and
95 atm, using up 93.5 mol N2.
How many moles of ammonia
form?
Answer:
187 moles NH₃
Explanation:
To find the amount of ammonia formed, you need to multiply the given value by the mole-to-mole ratio consisting of both relevant molecules. The mole-to-mole ratio is made up of the molecules' coefficients in the balanced equation. The desired unit should be placed in the numerator of the ratio. The final answer should have 3 sig figs to reflect the lowest amount of sig figs among the given values.
1 N₂ + 3 H₂ ----> 2 NH₃
^ ^
93.5 moles N₂ 2 moles NH₃
---------------------- x ------------------------- = 187 moles NH₃
1 mole N₂
Use the periodic table to answer the questions below.
Which diagram shows the correct electron
configuration for nitrogen (N)?
N N N1
1s
2s
2p
NN ILL
1s 2s
2p
N N
1s
2s
DONE✔
2p
The diagram that show the correct electron configuration is the second option. ⬆⬇1s, ⬆⬇2s, ⬆⬆⬆2p.
What is electronic configuration?The electronic configuration is the representation of electron present indifferent energy levels is an atom. The different type of orbitals are s, p, d, and f.
Thus, the correct option is 2, ⬆⬇1s, ⬆⬇2s, ⬆⬆⬆2p.
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How many moles of CF4 can be produced when 8.95 mol C reacts with 7.88 mol F2?
How many moles of each reactant are left over? (Note that at least one of the reactants must disappear.)
C remaining
mol
F2 remaining
mol
The remaining moles of C is 5.01 moles while the remaining moles of F₂ is 0.
Reaction between Carbon and Fluorine
The reaction between carbon and Fluorine is given as;
C + 2F₂ -------> CF₄
1 : 2 1
from the reaction above,
2 moles of F₂ requires 1 mole of C
7.88 mole of F₂ will require: 7.88/2 = 3.94 moles of C and 3.94 moles of CF₄.
The remaining moles of C = 8.95 - 3.94 = 5.01 moles while the remaining moles of F₂ is 0.
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Scientists are trying to find out why bees are dying in large numbers. Which best describes how the scientists will try to solve the problem?
A. They will do the same experiments to obtain similar evidence.
B. They will only work with scientists who share the same opinions.
C.
They will observe the same patterns and draw the same conclusions
D.
They will approach the problem in different ways but share ideas.
Answer: D. They will approach the problem in different ways but share ideas.
work out the size of resistance.
Answer:
Step 1: Identify the resistivity (ρ) , length (L), and radius (r) of the wire. Step 2: Calculate the cross-sectional area of the wire using the formula for the area of a circle: A=πr2 A = π r 2 . Step 3: Calculate the resistance (R) of the wire using the formula for resistance: R=ρLA R = ρ L A
