Answer:
4 Al(s) + 3 O₂(g) ⇒ 2 Al₂O₃(s)
Explanation:
Let's consider the unbalanced molecular equation when aluminum metal and oxygen gas combine to produce aluminum oxide. This is a combination reaction.
Al(s) + O₂(g) ⇒ Al₂O₃(s)
We can balance O atoms by multiplying O₂ by 3 and Al₂O₃ by 2.
Al(s) + 3 O₂(g) ⇒ 2 Al₂O₃(s)
Finally, we multiply Al by 4 to get the balanced equation.
4 Al(s) + 3 O₂(g) ⇒ 2 Al₂O₃(s)
Hydrogen bonds are formed between molecules when hydrogen is covalently bonded to an element that has a
1
small atomic radius and low electronegativity
2
large atomic radius and low electronegativity
3
small atomic radius and high electronegativity
4
large atomic radius and high electronegativity
Submit Answer
Answer:
choice 3
Explanation:
Hydrogen bonding occurs when a H is bonded to a highly electronegative atom like F. Towards the upper right corner, most atoms have high electronegativity and small atomic radii, according to periodic trends.
Please give thanks :)
Hydrogen is covalently bonded to an element that has a small atomic radius and high electronegativity.
• An intermolecular attractive force in which an atom of hydrogen, which is bonded covalently to a small, highly electronegative atom is known as a hydrogen bond.
• Hydrogen bonds are very strong in comparison to other dipole interactions.
• A typical hydrogen bond exhibits a strength of about 5 percent of that of a covalent bond.
• Hydrogen bonding takes place only in molecules where hydrogen bonding is bonded covalently to one of the three elements, that is, oxygen, fluorine, or nitrogen.
Thus, correct answer is option 3.
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A desert area has many species of cactus and brush as well as birds, snakes, lizards, and rodents. This desert is an example of a
Answer: Climax Commuity.
Explanation: (hope it’s right! Good luck!)
A chemical reaction is shown below:
Glucose + Oxygen --> Water + Carbon Dioxide
How many grams of water would be produced if the reaction contained each of the following:
20 g of glucose
15 g of oxygen
30 g of carbon dioxide
SELECT AN ANSWER
15 g of water
35 g of water
65 g of water
5 g of water
Answer:
Mass = 8.46 g
Explanation:
Given data:
Mass of water produced = ?
Mass of glucose = 20 g
Mass of oxygen = 15 g
Solution:
Chemical equation:
C₆H₁₂O₆ + 6O₂ → 6H₂O + 6CO₂
Number of moles of glucose:
Number of moles = mass/molar mass
Number of moles = 20 g/ 180.16 g/mol
Number of moles = 0.11 mol
Number of moles of oxygen:
Number of moles = mass/molar mass
Number of moles = 15 g/ 32 g/mol
Number of moles = 0.47 mol
now we will compare the moles of water with oxygen and glucose.
C₆H₁₂O₆ : H₂O
1 : 6
0.11 : 6/1×0.11 = 0.66
O₂ : H₂O
6 : 6
0.47 : 0.47
Less number of moles of water are produced by oxygen thus it will limit the yield of water and act as limiting reactant.
Mass of water produced:
Mass = number of moles × molar mass
Mass = 0.47 mol ×18 g/mol
Mass = 8.46 g
During science lab, Jacob mixes together sodium hydroxide (NaOH) and hydrochloric acid (HCl). The two chemicals react to form sodium chloride (NaCl) and water (H2O).
Which of the following are reactants in the chemical reaction described above?
A.
hydrochloric acid and water
B.
sodium hydroxide and hydrochloric acid
C.
sodium hydroxide and sodium chloride
D.
sodium chloride and water
B. Sodium hydroxide and Hydrochloric acid
Further explanationChemical equations can be expressed in terms of
word reaction formula reactionIn a chemical reaction, there are several components, including reactants, products, and compounds that react in the form of solids, gases, and liquids
Reactants are compounds that react and form products
The reactants are generally to the left of the chemical equation and the products are to the right of the reaction
The statement of the word reaction above can be expressed by the reaction formula
[tex]\tt NaOH+HCl\rightarrow NaCl+H_2O[/tex]
This reaction is called a neutralization reaction because it involves acids(HCl) and bases(NaOH) and produces salt(NaCl)and water(H₂O)
From the reaction above, the reactants on the left are NaOH and HCl compounds
Assuming the graphs are constructed to the same scale, which seismograph shows the shortest S-P time?
Answer:
a
Explanation:
When chlorobenzene reacts with Mg in ether followed by CO2 and neutralization with dilute HCl, __________ will be formed.
a. p-chlorobenzoic acid
b. p-deuterobenzoic acid
c. benzoic acid
d. benzene
e. No correct response
Answer:
c. benzoic acid
Explanation:
The given reaction is an example of a Grignard reaction:
When chlorobenzene (C₆H₅Cl) reacts with Mg in ether, an intermediate is formed (C₆H₅MgCl).
Said intermediate then reacts with CO₂ producing a benzoic acid salt (C₆H₅CO₂X), this salt is then neutralized with dilute HCl producing benzoic acid (C₆H₅CO₂H).
Which of the following makes sense to round to the nearest 10?
A. Your friend's telephone number
B. The PIN code of your city or town
C. The number of pages in your Maths book
D.t he year of your birth
Answer:
C
Explanation:
You can’t round a phone number or Pin code
why would you round your birth year?
Which property of gases is explained by the process of diffusion?
A.
their ability to compress under high temperature
B.
their ability to expand under low temperature
C.
their ability to expand under pressure
D
their ability to fill the available volume of a container
Answer:
The appropriate alternative is "Option D".
Explanation:
Diffusion would be a random or physical phenomenon that corresponds to that same transfer budget of molecules from some kind of highly concentrated area to something like a lower one. The substance which diffuses may be strong, liquids, and gaseous. Correspondingly, the framework where certain diffusion happens can however be amongst the three aspects of sustainability.All those other options aren't relevant to the situation in question. So the above alternative becomes the right one.
For doping silicon with boron, silicon specimen was kept in gaseous atmosphere containing B2O3 that maintained the B concentration at the surface of Si specimen at the level of 3*10^26 boron atoms/m^3. The process was carried out at 1100 degrees C. The diffusion coefficient of B in Si at 1100 degrees C is 4*10^-13 cm^2/s. Calculate the concentration of B at the depth of 10^-4 cm from the surface after 130 minutes of diffusion at 1100 degrees C
Solution :
From Fick's law:
[tex]$\frac{D_{AB}}{\Delta z } \times (C_{A1}-C_{A2})=N_a$[/tex]
Mass balance: Exits = Accumulation
[tex]-N_A A = \frac{dm}{dt}[/tex]
[tex]-N_A A = \frac{dVp}{dt}[/tex]
[tex]-N_A A = \frac{dV}{dt}p[/tex]
[tex]-N_A A = \frac{dhA}{dt}[/tex]
[tex]-N_A A = \frac{dh}{dt} \times Ap[/tex]
From the last step, area cancels out and thus leaves :
[tex]-N_A = \frac{dh}{dt} \times p[/tex]
So now we can substitute the [tex]$N_A$[/tex] by the Fick's law
[tex]$\frac{D_{AB}}{\Delta z } \times (C_{A1}-C_{A2})=\frac{dh}{dt} p$[/tex]
Substituting the values we get
[tex]$=\frac{-4 \times 10^{-13}}{0.0001} \times (3 \times 10^{26} - C_{A2}) = \frac{dh}{dt} \times 2.46$[/tex]
[tex]$=-4 \times 10^{-9} \times( 3 \times 10^{26} - C_{A2}) = 0.0001 \times 2.46$[/tex]
[tex]$= -7800 \times 4 \times 10^{-9} \times (3 \times 10^{26}-C_{A2})=0.000246$[/tex][tex]$=-(3 \times 10^{26}-C_{A2}) = 7.8846 \times 100 \times \frac{1}{69.62} \times 6.022 \times 10^{23}$[/tex]
[tex]$C_{A2} = 6.85 \times 10^{28} \ \text{ boron atoms} /m^3$[/tex]
The value of ΔH° for the reaction below is -126 kJ. __________ kj are released when 2.00 mol of NaOH is formed in the reaction?
2 Na2O2 (s) + 2 H2O (l) → 4NaOH (s) + O2 (g)
A) 252
B) 63
C) 3.9
D) 7.8
E) -126
"63" kj are released. A further solution is provided below.
The equation is:
[tex]2 Na_2O_2 (s) + 2 H_2O (l) \rightarrow 4NaOH (s) + O_2 (g)[/tex]Value of ΔH,
-126 kJAs we know,
4 moles of NaOH - (-126) kJ 2 moles of NaOH - XNow,
→ [tex]4\times X=-126\times 2[/tex]
→ [tex]4X = -252[/tex]
→ [tex]X = -\frac{252}{4}[/tex]
→ [tex]= -63[/tex]
Thus the above response is correct.
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if the Chemical Reaction bellow started out with a total mass of 45 grams, what would be the total mass of the products?
2Na + 2H2O ---> 2 NA OH + H2
Answer:
When 45 gram of total mass of reactant react 45 gram of product will also produced
Explanation:
Law of conservation of mass:
According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.
This law was given by French chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
For example:
In given photosynthesis reaction:
6CO₂ + 6H₂O + energy → C₆H₁₂O₆ + 6O₂
there are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction followed the law of conservation of mass.
In a similar way,
2Na + 2H₂O → 2NaOH + H₂
45 g = 45 g
when 45 gram of total mass of reactant react 45 gram of product will also produced. (2NaOH + H₂ = 45 g)
what's common to H20,HF and NH3
Answer:
They all contain sone hydrogen atoms.
Explanation:
H is hydrogen doi
solve the equation: 3)15.000 cm²= x dm ²
BRAINLIEST!!!!
Answer:
x = 150 dm
Explanation:
10 cm = 1 dm
100 cm² = 1 dm²
15,000 cm² = 150 dm²
Answer:
csc = (60)
cos = (390)
−4 = cot (−45)
Explanation:
make me braienst please?
A sample of nitrogen gas is in a 65.0-L automobile air bag and has a pressure of 745 mm Hg. What is the pressure of this sample of gas at the same temperature if it is placed into a 25.0-L bag
Answer:
the pressure = 1937mmhg using standered unit of volume
Which term refers to the process by which land is worn away by natural forces or human activity?
Answer:
erosion
Explanation:
erosion is the term that refers to the process by which land is worn away by natural forces or human activity.
Answer:
Erosion
Explanation:
Just took the test, hope it helps!
if an endothermic reaction begins at 26°C and decreases by 2°C per minute how long will it take to reach 0°C?
Answer:
13 minutes
Explanation:
For the endothermic reaction to reach 0°C, it will take 13 minutes.
Let us follow the process step by step;
Rate of decrease is 2°C per minute.
Start is 26°C
Time temperature
0 min 26°C
1 min 24°C
2 min 22°C
3 min 20°C
4 min 18°C
5 min 16°C
6 min 14°C
7 min 12°C
8 min 10°C
9 min 8°C
10 min 6°C
11 min 4°C
12 min 2°C
13 min 0°C
which part of the mushroom gathers nutrients from the soil or dead material that the mushroom is decomposing?
Answer:
The Mycelium is usually hidden in the soil, in wood, or another food source. A Mycelium may fill a single ant or cover many acres.
even about the food chain is correct?
Answer:
its C, because the cocunut tree gets energy from the sun and makes it into cocunut that is true
Explanation:
its C, because the cocunut tree gets energy from the sun and makes it into cocunut that is true
When you lift an object, you add the energy of lifting the object to the object
Answer:
Which is kinetic energy at its best, cause you are moving your arm or hand in motion, bu the object is in potential energy, where it isn't moving
Explanation:
Between which two objects is gravitational attraction the greatest?
between the penny and the small pot
between the book and the cereal box
between the small pot and the book
between the paper clip and the penny
Answer:
Between the small pot and the book
Explanation:
Since gravitational force is influenced by the mass of an object, the higher the mass of two objects, the stronger the gravitational force.
Thus, the force between the pot and the book is strongest, since the two have the highest mass.
Have a nice day!
help help
What are the cells that respond to stimuli called?
Answer:
receptors which detect stimuli changes in the environment
Explanation:
heyyy Powerpuff girls! what advantage does globe maps have over a flat map?
Answer:
The advantage of the globe is that it promotes visual accuracy. Students need to use a globe frequently if they are to form accurate mental maps. The advantage of the world map is that you can see the entire world at one time. The disadvantage is that world maps distort shape, size, distance, and direction.
Explanation:
miss girl- you could've just looked this up
(just make it look like you typed it)
Answer:
The advantage of the globe is that it promotes visual accuracy. Students need to use a globe frequently if they are to form accurate mental maps. The advantage of the world map is that you can see the entire world at one time. The disadvantage is that world maps distort shape, size, distance, and direction.
Friend?
What is the frequency of green light
that has a wavelength of 531 nm? (c
= 3.00 x 108 m/s)
We are given:
Wavelength of Green light (λ) = 531 nm OR 531 * 10⁻⁹ m
Speed of light (c) = 3* 10⁸ m/s
Solving for the Frequency of the wave:
We know the relation:
c = νλ
(where ν is the frequency, c is the speed of light and λ is the wavelength)
3*10⁸ = ν*(531*10⁻⁹)
ν = 3*10⁸ / 531*10⁻⁹ [dividing both sides by the wavelength]
ν = 3*10⁸*10⁹ / 531 [ since a⁻¹ = 1/a]
ν = 3*10¹⁷ / 531 [ since mᵃ * mᵇ = mᵃ⁺ᵇ]
ν = 10¹⁷ / 177
ν = 1000 * 10¹⁴ / 177 [we split the numerator to simplify]
ν = 5.65 * 10¹⁴
Hence, the frequency of Green light is 5.65 * 10¹⁴ Hz
Answer:
f = 5.6×10¹⁴ Hz
Explanation:
Given data:
Wavelength of green light = 531 nm (531×10⁻⁹ m)
Frequency of green light = ?
Solution:
Formula;
Speed of wave = wavelength × frequency
Speed of wave = 3.00×10⁸ m/s
by putting vales,
3.00×10⁸ m/s = 531×10⁻⁹ m × f
f = 3.00×10⁸ m/s / 531×10⁻⁹ m
f = 0.0056×10¹⁷ s⁻¹
f = 5.6×10¹⁴ Hz (Hz = s⁻¹)
A large balloon contains 5400 m3 of He gas that is kept at a temperature of 280 K and an absolute pressure of 1.10 x 105 Pa. Find the mass of He inside the balloon. (Molar mass of He : 4.002 g/mol)
Answer:
1.02 × 10⁶ g
Explanation:
Step 1: Given data
Volume of the balloon (V): 5400 m³Temperature (T): 280 KAbsolute pressure (P): 1.10 × 10⁵ PaMolar mass of He (M): 4.002 g/molStep 2: Convert "V" to L
We will use the conversion factor 1 m³ = 1000 L.
5400 m³ × 1000 L/1 m³ = 5.400 × 10⁶ L
Step 3: Convert "P" to atm
We will use the conversion factor 1 atm = 101325 Pa.
1.10 × 10⁵ Pa × 1 atm / 101325 Pa = 1.09 atm
Step 4: Calculate the moles of He (n)
We will use the ideal gas equation.
P × V = n × R × T
n = P × V / R × T
n = 1.09 atm × 5.400 × 10⁶ L / 0.08206 atm.L/mol.K × 280 K
n = 2.56 × 10⁵ mol
Step 5: Calculate the mass of He (m)
We will use the following expression.
m = n × M
m = 2.56 × 10⁵ mol × 4.002 g/mol
m = 1.02 × 10⁶ g
List two different reasons ants work together
An ideal gas, consisting of n moles, undergoes an irreversible process in which the temperature has the same value at the beginning and end. If the volume changes from Vi to Vf, the change in entropy is given by:
Answer:
ΔS = nR(In (Vf/Vi))
Explanation:
We are told the temperature has the same value and therefore it's constant.
Formula for change in entropy isothermally is;
ΔS = nR(In (V2/V1))
V2 is final volume and V1 is initial volume.
We are told that the volume changes from Vi to Vf.
Thus, V2 = Vf and V1 = Vi
Hence;
ΔS = nR(In (Vf/Vi))
A mixture of methane and oxygen gases at a total pressure of 727 mm Hg contains methane at a partial pressure of 571 mm Hg. If the gas mixture contains 3.62 grams of methane, how many grams of oxygen are present
Answer: 1.95 g of oxygen is present.
Explanation:
According to Dalton's law, the total pressure is the sum of individual pressures.
[tex]p_{total}=p_{methane}+p_{oxygen}[/tex]
Given : [tex]p_{total}[/tex] =total pressure of gases = 727 mm Hg
[tex]p_{methane}[/tex] = partial pressure of methane = 571 mm Hg
[tex]p_{oxygen}[/tex] = partial pressure of oxygen = ?
[tex]727=571+p_{oxygen}[/tex]
[tex]p_{oxygen}=156mmHg[/tex]
Also [tex]p_{oxygen}=x_{oxygen}\times p_{total}[/tex]
Given : 3.62 g of methane is present
moles of methane = [tex]\frac{\text{Given mass}}{\text {Molar mass}}=\frac{3.62g}{16g/mol}=0.226moles[/tex]
[tex]x_{oxygen}[/tex] = mole fraction of oxygen
=[tex]\frac{\text {moles of oxygen}}{\text {total moles}}=\frac{y}{y+0.226}[/tex]
[tex]156=\frac{y}{y+0.226}\times 727[/tex]
[tex]y=0.061[/tex]
mass of oxygen = [tex]moles\times {\text {Molar mass}}=0.061\times 32=1.95g[/tex]
Thus 1.95 g of oxygen is present.
which one does not share the same properties as the other
Si
Ti
At
Explain why
Answer:
Ti
Explanation:
Ti is titanium and does not share any similar properties with the likes of Si, silicon and At, astatine.
Titanium is a transition metal and a solid. Silicon and Astatine are non - metals. Silicon and Astatine also belongs to the p-block on the periodic table whereas Titanium is found on the d-block. Silicon and Astatine would prefer to take part in reactions where they can gain electrons because they are non metals whereas Titanium due to its metallic property would prefer a reaction where it can lose electrons.(3.5x10^5)x(4x10^-3)=exponent form
Answer:
1.4 x 10³
Explanation:
Given:
(3.5 x 10⁵)x(4 x 10⁻³)
Find:
Exponent form
Computation:
⇒ (3.5 x 10⁵)x(4 x 10⁻³)
⇒ 3.5 x 4 x 10²
⇒ 14 x 10²
1.4 x 10³
Please show work!
Question below::
