Answer:
See explanation
Explanation:
Aluminium is an amphoteric metal. This means that it reacts with both acids and bases. This property of aluminium is important in the discussion below.
Aluminium cookers can not be used to cook acidic food because it will react with the food and this is not good both for the food and the cooker.
Also, It is not possible to clean an aluminium pot with sodium hydroxide because the sodium hydroxide will react with the pot yielding hydrogen gas since aluminium is amphotheric as follows;
2Al + 2NaOH + 2H2O → 2NaAlO2 + 3H2
Aluminum has been the metal of group 13 of the periodic table. Aluminum has been reacting with capability with both acids and bases.
A. The acidic food has not been cooked in the aluminum wares with the ability of Aluminum to react with the acid of the food and change the chemical composition.
B. The aluminum can react with the bases and acids. The reaction of aluminum with NaOH has resulted in the liberation of hydrogen gas with the formulation of sodium tetrahydroxoaluminate.
The compound has been easy to clean, and thus NaOH solution is used for cleaning and etching of aluminum.
For more information about Aluminum, refer to the link:
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A sample of CO2 gas has a volume of 2.7 L at 78.5 kPa. At what pressure would this sample of gas have a volume of 4.0L? Temperature is constant
Answer:
52.99 kPa
Explanation:
Initial volume V1 = 2.7 L
Initial Pressure P1 = 78.5 kPa
Final Volume V2 = 4.0L
Final Pressure P2 = ?
Temperature is constant
The relationship between these quantities is given by the mathematical expression of Boyles law. This is given as;
V1P1 = V2P2
P2 = V1P1 / V2
P2 = 2.7 * 78.5 / 4.0
P2 = 52.99 kPa
Determine how many moles of water (H2O) are formed from the combustion of 7.50 x 1023 molecules of propane (C3H8). 1 C3H8 (g) + 5 O2 (g) ⟶ 3 CO2 (g) + 4 H2O (g)
Answer:
4.98 moles of H₂O
Explanation:
The balanced chemical equation for the combustion of propane is:
C₃H₈ (g) + 5 O₂ (g) ⟶ 3 CO₂ (g) + 4 H₂O (g)
That means that 1 mol of propane (C₃H₈) produces 4 moles of water (H₂O).
We know that 1 mol is equal to 6.022 x 10²³ molecules. So, we convert the molecules of propane to moles as follows:
7.50 x 10²³ molecules C₃H₈ x 1 mol/6.022 x 10²³ molecules = 1.245 mol C₃H₈
Now, we use the stoichiometric ratio 4 mol H₂O/1 mol C₃H₈ derived from the chemical equation to calculate the moles of water produced:
1.245 mol C₃H₈ x 4 mol H₂O/1 mol C₃H₈ = 4.98 mol H₂O
how should baking pizza be categorized
Answer: The baking of a pizza should be categorized as an endothermic process because the dough absorbs heat. An endothermic process is a method that absorbs energy from its surroundings which is habitually in the form of energy
Explanation:
Answer:
endothermic; the dough absorbs heat
Explanation:
EDG2020
Which of the following practices below are used to help conserve soil?
Select 3 answers that apply.
Look at the picture.
Answer:
B, C ,E those are the three practice in the options you have
4. When the speed of the following water increases it cuts into the
surface of the soil.
O Soil erosion
O Sheet erosion
Rill erosion
O Gully erosion
Answer:
Option 1, Soil erosion
Sulfur hexafluoride, SF6, is a colorless, odorless, very unreactive gas. Calculate the pressure (in atm) exerted by 2.02 moles of the gas in a steel container of volume 6.21 L at 70 ℃.
Answer:
9.15 atm
Explanation:
Ideal gas equation of state PV=nRT
P in hPa, V in L, n in mol, R is a constant which is 83.1 hpa*L/mol*k, T in kelvin.
Plug in all the number, and we will get:
P*6.21=2.02*83.1*343
P =9271.6(in hpa)=9.15 atm
Ethanol, C2H5OH, is manufactured on a large scale for a wide range of uses such as alcoholic drinks, as an industrial solvent and as a raw material for the synthesis of many organic compounds. Ethanol, C2H5OH, is manufactured on a large scale by two methods: • Fermentation, using yeast, of sugars, such as glucose, C6H12O6. C6H12O6(aq) 2C2H5OH(aq) + 2CO2(g) The ethanol is then distilled off. • Hydration of ethene, C2H4, with steam in the presence of an acid catalyst. C2H4(g) + H2O(g) C2H5OH(g) Compare the sustainability of these methods of manufacturing ethanol in terms of: • availability of starting materials and energy requirements; • atom economy. In your answer, you should make clear how the atom economy of the processes links with chemical theory.
Answer:
See explanation
Explanation:
In considering the sustainability of the two processes, we must remember that fermentation involves the use of sugars as raw materials. These sugars are grown naturally as plants from which sugars are extracted for the fermentation process. This is a sustainable process because sugar is a renewable resource.
On the other hand, ethene is produced from the cracking of fractions obtained from distillation of natural gas and oil. Natural gas and oil are not renewable resources hence the process is not sustainable. The cracking of ethene requires a lot of energy compared to the fermentation of sugar.
As regards atom economy, the cracking of ethene, C2H4(g) + H2O(g) ------> C2H5OH(g) has a better atom economy compared to the fermentation of sugar; C6H12O6(aq) -------> 2C2H5OH(aq) + 2CO2(g).
Atom economy has to do with the process of designing reactions in such a way that atoms which are in the starting materials end up in the final product and not as waste materials.
Fermentation produces a waste material which is CO2 while the cracking of ethene produces no waste material. All atoms of the reactants are converted into atoms of products.
Hence, the cracking of ethene displays 100% atom economy. This implies that all reactant atoms are found in the desired product.
Na2CO3 + 2HCl ---------> 2NaCl + CO2 + H2O How many moles of NaCl are produced from the reaction of 1.67 x 1022 molecules of Na2CO3 with excess HCl?
Answer:
0.0554 moles of NaCl are produced from the reaction of 1.67*10²² molecules of Na₂CO₃ with excess HCl.
Explanation:
The balanced reaction is:
Na₂CO₃ + 2 HCl → 2 NaCl + CO₂ + H₂O
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of each compound participate in the reaction:
Na₂CO₃: 1 mole HCl: 2 moles NaCl: 2 moles CO₂: 1 mole H₂O: 1 moleOn the other hand, Avogadro's Number is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023*10²³ particles per mole. Avogadro's number applies to any substance.
In this case, you can apply the following rule of three: if 6.023*10²³ molecules of Na₂CO₃ are contained in 1 mole, 1.67*10²² molecules will be contained in how many moles?
[tex]amount of moles=\frac{1.67*10^{22}molecules*1mole }{6.023*10^{23}molecules}[/tex]
amount of moles= 0.0277 moles
In this case, you can apply the following rule of three: if by stoichiometry 1 mole of Na₂CO₃ produces 2 moles of NaCl, 0.0277 moles of Na₂CO₃ will produce how many moles of NaCl?
[tex]amount of moles of NaCl=\frac{0.0277 moles of Na_{2} CO_{3}*2 moles of NaCl }{1 mole of Na_{2} CO_{3}}[/tex]
amount of moles of NaCl= 0.0554 moles
0.0554 moles of NaCl are produced from the reaction of 1.67*10²² molecules of Na₂CO₃ with excess HCl.
I need the definition of Friction, choose one! Thank you
Answer:
the force resisting motion. it slows things down
A weather balloon filled with helium has a volume of 700 L at STP. To find the mass of helium which conversion factors would you use
A) 22.4 L/mol x 4 g/mol
B) 700 L / 4 g/mol
C) (22.4 L/mol / 700 L ) / (4 g/mol)
D) (700 L / 22.4 L/mol) (4 g/mol)
Answer:
D: (700 L / 22.4 L/mol) (4 g/mol)
Explanation:
At STP, Molar volume of a gas = 22.4 L/mol
Now, we are told that helium has a volume of 700 L at STP.
Also, atomic mass of helium = 4 g/mol
Thus, the mass of helium is given as;
(700 L/22.4 L/mol) × 4 g/mol
after the child exhaled all of the gas, it becomes sick
Which of the following is likely to form volcanic mountains?
A. One of two converging plates sinks under
the other plate and melts.
B. Two converging plates collide
Answer:
b
Explanation:
you're welcome I guess
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Ozone (O₃) in the atmosphere may react with nitric oxide (NO). O₃(g)+NO(g)→NO₂(g)+O₂(g)
From the following data calculate DG° in kJ for the reaction at 25°C and determine whether the reaction is spontaneous.
ΔH°=-199kJ ΔS°=-4.1J/K
Answer:ΔG° = 1022. 8 kJ
ΔH° = –199 kJ/mol
ΔS° = –4.1 J/K·mol
T = 25°C = 25 + 273 = 298K (Converting to kelvin temperature)
ΔG° = ?
Explanation:The relationship between these varriables are;
ΔG° = ΔH° - TΔS°
ΔG° = –199 - 298 (–4.1)
ΔG° = -199 + 1221.8
ΔG° = 1022. 8 kJ
sorry if uncorrect
Formula Mass & Percent Composition
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How many moles of sodium hydroxide would have to be added to 250 mL of a 0.303 M hydrofluoric acid solution, in order to prepare a buffer with a pH of 3.630?
Answer:
0.0562 moles
Explanation:
Based on the H-H equation, for the HF buffer:
pH = pKa + log [F⁻] / [HF]
Where pH is the pH of the buffer = 3.630
pKa is pKa of HF buffer: 3.17
And [] could be taken as the moles of each reactant
3.630 = 3.17 + log [F⁻] / [HF]
0.46 = log [F⁻] / [HF]
2.884 = [F⁻] / [HF] (1)
The initial moles of HF are:
0.250L * (0.303mol / L) = 0.07575 moles
The HF reacts with NaOH as follows:
HF + NaOH → NaF + H₂O
That means the moles of HF will be the initial moles of HF - Moles NaOH
And moles NaF = F⁻ = Moles of NaOH added
That means:
0.07575 moles = [F⁻] +[HF] (2)
Replacing (2) in (1):
2.884 = [F⁻] / 0.07575 moles - [F⁻]
0.218 - 2.884[F⁻] = [F⁻]
0.218 = 3.884[F⁻]
[F⁻] = 0.0562 moles
That means the moles of NaOH that must be added are:
0.0562 moles6. What type of energy is the result of water and hot matter interacting?
Boiling water on a stove is an example of thermal energy. Thermal energy is produced when the atoms and molecules in a substance vibrate faster due to a rise in temperature.
TICLA ruuis SLCLLICU 10115CI.
Question 3 (1 point)
Which option correctly ranks the states of matter from slowest to fastest particle
speed.
gas, liquid, solid
solid, liquid, gas
solid, gas, liquid
gas, solid, liquid
If the substance in the diagram was heated to T2, what is happening if the substance is allowed to approach T1?
1.The average kinetic energy is decreasing
2. The average kinetic energy has increased
3. The highest energy level has decreased
4. Fewer molecules would have a lower energy level
5. More molecules have a higher energy level
Answer:
b
Explanation:
1.Which of the following would decrease the rate of a chemical reaction?
A Increase the temperature
B Reduce the concentration of a reactant
C Increase the concentration of a reactant
D Add a catalyst
Answer:
d.) add a catalyst
Explanation:
ae per I know this is Ur , but I am not sure so u check it
B. Reduce the concentration of a reactant
A chemical reaction is a process that leads to the chemical transformation of one set of chemical substances to another.When the surface area of reactants is more the sites available for the collisions increase. More collisions between the reactants increases the rate of a chemical reaction. Decreasing the surface area of reactants decreases available site for collision. This eventually decreases the rate of a chemical reaction.To decrease the rate of a chemical reaction, B. Reduce the concentration of a reactantFor more information:
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Carbon dioxide goes into a plant's leaves when it's photosynthesizing is this an example of diffusion or osmosis or neither?
Answer:
diffusion
Explanation:
plants have stomata at the bottom of their leaves. these allow for CO2 to diffuse in and out of the plant.
List four functions that different proteins have in living organisms.
Answer:
Proteins have different functions within living beings: Cellular transport. Structure of hair, muscle, nails, cell components and cell membranes. Biological catalysts or enzymes.
Explanation:
I hope this answer has helped you
Answer:
Enzymes and antibodiesIf you had to choose between using fossil fuels or nuclear energy to generate electricity, which would you choose?
DO 25 through 37 WRITE IF ITS TRUE OR FALSE FOR EACH ONE. ILL MARK YOU AS BRAINLIEST IF YOU COMPLETE IT AND ALSO SEND ME YOUR CASHAPP NAME SO I SEND YOU $25.
How are the atoms of carbon different from the atoms of nitrogen
Per my research, it was said that each of the atoms of the carbon has over 6 protons, six neutrons, and 6 protons. Each atom of nitrogen has 7 protons, 7 electrons, and 7 neutrons. The atomic mass of carbon and nitrogen is 12 and 14 respectively. As the number of electrons in the atoms of the two elements is different they have different chemical properties.
Explanation:As you may know, I did my research and this is what it gave me. I would suppose it is correct since it explains that the carob has over 6 protons and so on. Correct me if I am incorrect and I hope this helped. Have a good one!
(っ＾▿＾)۶٩(˘◡˘ )Which option most accurately explains relationships between phases, energy and mobility of the matter?
Molecules making up water vapor have less energy and are less mobile than ice.
Molecules making up water vapor have less energy and are more mobile than ice.
Molecules making up water vapor have more energy and are more mobile than ice.
Molecules making up water vapor have more energy and are less mobile than ice.
Answer:
Molecules making up water vapor have more energy and are more mobile than ice.
Explanation:
Looking through the options, this has to deal with water vapor molecules and ice molecules,
Water vapor is a gas and ice is a solid.
Gas molecules are mobile than solid molecules. This means the first and last options are wrong.
Also, gas molecules are energetic than solid molecules.
The correct option is;
Molecules making up water vapor have more energy and are more mobile than ice.
Needing help please help me
Answer:
18. E. 0%
19. D. 25%
Explanation:
Question 18:
Let's use "B" to represent the dominant allele of "light blue skin", and
"b" for recessive "light green skin".
Squidward => BB - light blue skin
Squidward's bride => bb - light green skin
When they cross, they will have the following offsprings:
(BB) × (bb) - Parent
(Bb) (Bb) (Bb) (Bb) - Offspring
All the offspring would be light green skin. The dominant allele of light green skin will express itself over the recessive allele.
Therefore, the chances of Squidward and his bride having light green skin is 0%
Question 19:
Squidward's son => Bb - light blue skin
Squidward's son's bride => Bb - light blue skin
(Bb) × (Bb) - parent
(BB) (Bb) (Bb) (bb) - offspring
They will have the following offspring:
BB and Bb - light blue - 75%
bb - light green - 25%
Chance of having offspring with light green skin is 25%
OMG PLEASE HELP ME :(
Answer:
D) The gravity on the moon is one sixth the gravity of Earth.
Explanation:
What does the prefix “geo” mean?
Please Help
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What is the name of the compound NO₄?
Answer:
hello
Explanation:
answer is oxido nitrate please follow me
choose the correct answer.
1 attac
Which substance will not conduct electricity?
A aluminium
B copper
C plastic
D steel
ОА. А
Explanation:
Covalent compounds (solid, liquid, solution) do not conduct electricity. Metal elements and carbon (graphite) are conductors of electricity but non-metal elements are insulators of electricity. Ionic bonds are the electrostatic attraction between positive and negative ions.
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