7.3g of NaOH are required to produce 16 g of H2O
What are molecular weight ?
The entire mass of the atoms required to form a molecule per mole, expressed in grams, is what makes up the molar mass, also known as the molecular weight. Grams per mole are used to measure molecular mass. To determine molecular weight, count the atoms in each element and increase the result by the element's atomic weight.
Caustic soda or lye are two other names for sodium hydroxide. It is a typical ingredient in soaps and cleansers. Sodium hydroxide is a colorless, odorless solid at room temperature. Sodium hydroxide is a white, odorless liquid.
39 g of NaOH gives 18g of H2O
? g of NaOH gives 16g of H2O
i.e 18*16/39g
i.e. 7.3g of NaOH are required to produce 16 g of H2O
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You observe that when oil and water combine, oil always rests on top of the water. What can be said about the density of oil and water?
The density of oil must be greater than the density of water.
The density of oil must be less than the density of water.
The density of oil must be the same as the density of water.
Answer: As a result, when you add oil to a cup of water the two don't mix with each other. Because oil is less dense than water, it will always float on top of water, creating a surface layer of oil.
The oxidation of so2 to so3 is accelerated by no2. The reaction proceeds according to:no2(g)+so2(g)⟶no(g)+so3(g)2no(g)+o2(g)⟶2no2(g)part ashow that, with appropriate coefficients, the two reactions can be summed to give the overall oxidation of so2 by o2 to give so3. Express your answer as a chemical equation. Identify all of the phases in your answer
The overall reaction for the oxidation of SO2 by O2 to give SO3 is:
SO2(g) + O2(g) ⟶ 2SO3(g)
The two given reactions are:
NO2(g) + SO2(g) ⟶ NO(g) + SO3(g)
2NO(g) + O2(g) ⟶ 2NO2(g)
Adding these reactions, we get:
NO2(g) + SO2(g) ⟶ NO(g) + SO3(g)
2NO(g) + O2(g) ⟶ 2NO2(g)
2NO2(g) + SO2(g) + O2(g) ⟶ 2NO(g) + 2SO3(g)
Therefore, the overall reaction for the oxidation of SO2 by O2 to give SO3 is:
SO2(g) + O2(g) ⟶ 2SO3(g)
where the catalyst NO2 is not explicitly shown. All the reactants and products are in the gas phase.
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How many molecules of 2.21 moles of propane (C3H8)?
Answer: Lebron
Explanation: James was here
why does direction matter please i beg you to help me its in science ill give you brainliest if the answer is right
In science, direction can be important because it can affect the outcome of an experiment.
What is direction?Direction is the process of guiding or instructing someone to a particular destination or goal. It can include giving instructions, leading and pointing out a path to follow, or providing assistance to help a person or group reach a certain destination. Direction can be provided verbally or using visual cues, such as maps or diagrams. It is an essential skill for many professions, such as teaching, management and leadership roles. Direction can also help with problem solving, as it can help to identify the steps needed to reach a desired result.
For example, if you are conducting a test on the effects of wind on a plant, the direction of the wind can have a significant effect on the results of the experiment. If the wind is blowing from the north, it will have a different impact on the plant than if it was blowing from the south. Direction can also be important in physics when looking at the movement of objects, or when understanding the forces that are acting on them.
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What is the correct answer help
The bond is a double covalent bond
What type of Bond is in N2 molecule?
The bond in the N2 molecule is a double covalent bond. In a covalent bond, atoms share electrons to fill their outermost valence shells and achieve greater stability.
In the case of the N2 molecule, each nitrogen atom has five valence electrons, and they share three electrons with each other to form a triple covalent bond. This results in a stable N2 molecule, with each nitrogen atom having a full outer shell of eight electrons.
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Use the equation for Charles’s Law to calculate the following. (2pts)
A plastic bottle is filled with a gas to the volume of 0.50 L at a temperature of 294.15K. The bottle then placed in a freezer for 24 hours at a temperature of 273.15K.
What is the volume of gas inside the plastic bottle when it is taken out of the freezer?
Answer:
670,385k
Explanation:
How many grams are in 6.500 moles of calcium nitride, Ca3N2?
There are 960.39 grams in 6.500 moles of calcium nitride (Ca3N2).
What is meant by moles?Mole is defined as to be containing exactly 6.02214076×10²³ elementary entities and mole is the unit of amount of substance in the International System of Units.
Molar mass of calcium nitride (Ca3N2) is: 3 (atomic mass of calcium) + 2 (atomic mass of nitrogen)
= 3(40.08 g/mol) + 2(14.01 g/mol)
= 120.24 g/mol + 28.02 g/mol
= 148.26 g/mol
mass (g) = moles × molar mass
mass (g) = 6.500 mol × 148.26 g/mol
= 960.39 g
Therefore, there are 960.39 grams in 6.500 moles of calcium nitride (Ca3N2).
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The beta decay of potassium 40 produces a beta particle and an atom with an atomic number of
A:18
B:39
C:20
D:21
The beta decay of potassium 40 produces a beta particle and an atom with an atomic number of 19.
So option C is correct answer.
What is Atomic Number?
The atomic number is the number of protons found in the nucleus of an atom of a chemical element. It is a fundamental property of an element, which determines its identity and its position in the periodic table.
Each element has a unique atomic number, which is represented by the symbol Z. For example, the element hydrogen has an atomic number of 1, which means that it has one proton in its nucleus. The element carbon has an atomic number of 6, indicating that it has six protons in its nucleus.
potassium that undergoes beta decay. During beta decay, a neutron in the nucleus of the potassium 40 atom is converted into a proton, and a beta particle (which is an electron) is emitted. The resulting atom has one more proton in its nucleus than the original atom, so its atomic number increases by one to 20.
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Which stars have the highest absolute brightness?
The HR diagram is shown with Absolute Brightness on the y axis from negative four to six and Surface Temperature on the x axis from 40,000 to 2,500 degrees Celsius. There are several dots plotted between four and six absolute brightness and 10,000 to 2,500 degrees Celsius labeled Supergiants. There are several dots plotted between 1.5 and three absolute brightness and 7,500 to 2,500 degrees Celsius labeled Giants. There are several dots plotted between negative four and negative two absolute brightness and 30,000 to 7,500 degrees Celsius labeled Dwarfs. Down the middle, there are several dots plotted diagonally from ordered pair 40,000 and five down to 2,500 and negative three labeled Main Sequence.
Supergiants
Giants
Yellow stars
Dwarfs
Answer:Super-giants
Explanation:
Which orbitals can overlap to form a pi bond?
Answer:
Explanation:
In addition, use Form 1099-MISC to report that you made direct sales of at least $5,000 of consumer products to a buyer for resale anywhere other than a permanent retail establishment.
Answer:
Pi bonds are formed from the overlap of parallel p orbitals on adjacent atoms. They are not formed from hybrid orbitals.
A sample of oxygen, O 2 , occupies 32.2 mL at 30 °C and 452 torr. What volume will it occupy at –70 °C and the same pressure?
The volume that the oxygen gas will occupy at 32.2mL and 30°C is 21.57mL.
How to calculate volume?The volume of a gas can be calculated using the combined gas law as follows:
P₁V₁/T₁ = P₂V₂/T₂
Where;
P₁, V₁ and T₁ = initial pressure, volume, and temperature respectivelyP₂, V₂ and T₂ = final pressure, volume and temperature respectivelyAccording to this question, a sample of oxygen gas occupies 32.2 mL at 30 °C and 452 torr.
452 × 32.2/303 = 452 × V/203
48.03 = 2.226V
V = 21.57mL
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Science (middle school work)
The answers include the following:
Population have variations which is the level of differences between two or more populations such as height and color differences etc.Some variations are favorable such that it makes an individual or organism better suited to survive and reproduce in their environment and an example is the long neck of the giraffe.Those that survive have favorable traits because it gives them some advantage and are more likely to survive and reproduce such as the speed of some preys such as deer etc.What is Variation?This is referred to as the difference in DNA among individuals or the differences between populations.
The organisms which survive have favorable traits because it gives them some advantage and are more likely to survive and reproduce such as the speed of some preys such as deer which helps it to evade predators and gives them enough time to mate and reproduce.
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__Cu + __AgNO3 —-> Cu(NO3)2 + __Ag
what’s the balanced equation?
what the molar ratio for
1) Cu to AgNO2
2) Cu to Ag
Answer:
1. 1 mole of Cu to 2 moles of AgNO3
2. 1 mole of Cu to 2 moles of Ag
Explanation:
Cu + 2AgNO3 —-> Cu(NO3)2 + 2Ag
Cu = 1
Ag = 2
NO3 = 2
1. 1 mole of Cu to 2 moles of AgNO3
2. 1 mole of Cu to 2 moles of Ag
pt.2 of first question… please help
The amount of the propane can be obtained from the mass and the mass of the propane.
How do you calculate the amount of propane gas in mole?To calculate the amount of propane gas in moles, you need to know the mass of propane gas and its molar mass. The molar mass of propane (C3H8) is approximately 44.1 g/mol.
Once you know the mass of the propane gas, you can use the following formula:
moles = mass (in grams) / molar mass (in grams per mole)
For example, let's say you have 88.2 g of propane gas:
moles = 88.2 g / 44.1 g/mol
moles = 2.0 mol
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Please i need help urgently. Is the formation of a fluid bubble on the penny an example of cohesion or adhesion? Explain
Answer:
The attraction of water molecules to other substances, like soil or glass, is called adhesion. As drops of water are added onto a penny, the adhesive force between the water and the penny keeps the water from falling off.
Explanation:
The formation of a fluid bubble on a penny is an example of cohesion, not adhesion.
When a penny is wetted with a small amount of water, the water molecules are attracted to each other by cohesive forces, which are intermolecular forces that bind molecules of the same substance together. As a result, the water molecules tend to stick to each other rather than to the surface of the penny, forming a rounded shape or a "bubble".
The cohesive forces between water molecules are strong enough to overcome the gravitational force acting on the small volume of water on the penny, which is why the water does not run off the penny. This phenomenon is also known as surface tension, which is the cohesive force that acts between molecules at the surface of a liquid.
In contrast, adhesion refers to the intermolecular forces that bind different substances together, such as the attraction between water molecules and a surface. If the adhesive forces between water and the penny were stronger than the cohesive forces between water molecules, the water would spread out over the surface of the penny, rather than forming a bubble. However, in the case of the penny and water, the cohesive forces between water molecules are stronger than the adhesive forces between water and the penny, resulting in a fluid bubble.
How many liters are in 0.500 moles of Ar?
The number of litres in 0.500 moles of Argon gas is 11.19L.
How to calculate volume?The number of litres in a substance can be calculated by dividing the mass of the substance by its density.
However, according to this question, there are 0.500 moles of Argon. The mass can be calculated as follows:
mass = no of moles × molar mass
mass = 0.5 mol × 39.948 u
mass = 19.97g
The density of argon gas at STP is 1.7857 g/L.
Volume = 19.97g ÷ 1.7857g/L
Volume = 11.19L
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Pls I need help urgently. Find the Lewis dot structure for water and ethanol and examine the structures and identify which part is partial negative and partial positive.
Both the hydrogen and oxygen atoms in water have a partial positive and negative charge. Both hydrogen and carbon ions are both somewhat positive in ethanol, while oxygen is partially negative.
Are ethanol and alcohol the same thing?The c (C), oxygen (O), & hydrogen (H) atoms that make up alcohols are combined to form organic molecules. The alcohol is known as ethanol if it contains two carbons (also known as ethyl alcohol). In beverages like beer and wine, alcohol is present in the form of ethanol.
Is alcohol ethanol's fundamental form?An constituent in alcoholic drinks including beer, wine, and brandy, ethanol is also known as alcohol, ethyl alcohol, and grain alcohol. It is a transparent liquid with no color. Ethylene can be hydrated to make ethanol, which is a naturally occurring result of plant fermentation.
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The Lewis dot structures for water (H2O) and ethanol (C2H5OH) are as follows:
Water (H2O):
H
/
H O
\ /
H
Ethanol (C2H5OH):
H H
\ /
C
/
H H
|
O
|
H
In both structures, the oxygen atom has a higher electronegativity than the hydrogen or carbon atoms, meaning it attracts electrons more strongly. As a result, the oxygen atom in both water and ethanol has a partial negative charge (denoted by the symbol δ-), while the hydrogen atoms have a partial positive charge (denoted by the symbol δ+). This polarity arises due to the unequal sharing of electrons between the oxygen and hydrogen atoms, with the oxygen atom attracting the electrons more strongly.
In water, the partial negative charge on the oxygen atom creates a hydrogen bond with the partial positive charge on a neighboring hydrogen atom of a nearby water molecule, resulting in the formation of a network of hydrogen bonds. These hydrogen bonds give water its unique properties, such as high surface tension and high boiling and melting points.
In ethanol, the partial negative charge on the oxygen atom is also responsible for the molecule's polarity. The carbon atom is partially positive due to the electron-withdrawing effect of the oxygen atom, which makes ethanol more soluble in polar solvents such as water. Ethanol can also form hydrogen bonds with water due to the presence of the hydroxyl (OH) group.
what is the iupac name of this element :NaB(OH)4
The IUPAC name of the compound NaB(OH)4 is sodium tetrahydroxyborate.
What is the iupac name of this element ?
The compound NaB(OH)4 is made up of sodium ions (Na+) and tetrahydroxyborate anions (B(OH)4-).
According to IUPAC naming conventions, the name of an ionic compound is written by listing the cation first, followed by the anion. In this case, the cation is sodium (Na+) and the anion is tetrahydroxyborate (B(OH)4-).
To name the tetrahydroxyborate anion, we start by identifying the boron atom, which has a valency of three. The hydroxide ions (OH-) are then added to balance the charge, resulting in the formula B(OH)4-.
The prefix "tetra-" indicates that there are four hydroxide groups attached to the boron atom. The suffix "-ate" is used to indicate that this is an anion.
Finally, the name of the compound is written as "sodium tetrahydroxyborate" because it contains one sodium cation and one tetrahydroxyborate anion.
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Which of the following atoms would
share properties and number of
electrons in their outermost energy
level?
a. Ne, Ar, and Kr
c. Si, As, and Sb
b. Li, Ca, and Mg
d. P, S, and Cl
Ne, Ar, and Kr share properties and the number of electrons in their outermost energy level because they belong to the same group (noble gases). Therefore, option A is correct.
What are noble gases and their properties?Any of a class of rare gases with high stability and very low reaction rates, such as helium, neon, argon, krypton, xenon, and occasionally radon. also known as the inert gas.
Noble gases are low chemically reactive, odorless, colorless, nonflammable, and monotonic gases. Noble gases are exceedingly stable and unlikely to form chemical connections since they have the minimal inclination to receive or lose electrons. Hence, option A is correct.
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Separate the Pennie’s you have into two groups: one group with Pennie’s dated before 1982 and the other with pennies dated after 1982. Compare the two groups. Record any similarities or differences in size or appearance that you notice between the two groups
Using hypothetical scenario, the Separation of the Pennie’s are given below
What are the Pennies about?Pennies dated after 1982 are lighter and thinner because zinc is less dense than copper. However, they have a similar diameter of 19.05mm to pennies dated before 1982. The difference in composition between the two groups is important because copper is a valuable metal, and the cost of producing a penny exceeded its value. By reducing the amount of copper in pennies, the U.S. Mint was able to save money on production costs.
Pennies dated before 1982 are made of 95% copper and 5% zinc and weigh 3.11 grams. They have a diameter of 19.05mm and a thickness of 1.55mm. Pennies dated after 1982 are made of 97.5% zinc and 2.5% copper and weigh 2.5 grams. They have a diameter of 19.05mm and a thickness of 1.52mm.
Therefore, the main difference between the two groups is their composition, weight, and thickness. The pennies dated before 1982 are larger, heavier, and thicker than those dated after 1982.
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How many moles of water will be produced from the complete combustion of 3 moles of C3H8?
If you have 3 moles of carbon dioxide and 4 moles of water that is being produced by a combustion of propane. That would make your answer be 4 moles
Hope this helps :)
Energy in Chemical Reactions II: Reflect
Write a reflection about your learning in this unit. Your reflection should be at least three sentences. Use the following sentence starters as a guide.
- I feel confident about modeling how the energy in a reaction will change, because…
- To try to make sure to consider all of the bonds involved in a change from reactants to products, one strategy I used was…
- If I am not sure about the bond, energies and potential energies in a reaction, one strategy, I can use is…
- If I am not sure about how the energy moves between the system and the surroundings in a reaction on strategy, I can use it…
PLEASE HELP ME I NEED THIS ASAPP!!!!
I feel confident about modeling how the energy in a reaction will change, because this unit provided me with the information necessary to determine the type. With this knowledge, I can now interrelate with other properties and believe that this new ability will assist in future units as well. This unit has encouraged a deeper understanding of the world and its guiding principles.
(HOPE THIS HELPS <3)
What is the source of nearly all of the energy for producers and consumers? Responses A. sunlight B. oxygen C.plants D. water
Answer:
A. sunlight
Explanation:
The source of nearly all of the energy for producers and consumers is sunlight
NEED HELP ASAP!! 100 POINTS!!
A liter of milk has a [H+] of about 2.51 × 10–7. (You may prefer to think of the hydronium ion concentration, [H3O+], as 2.51 × 10–7.) Use the formula for the calculation of pH provided and show each step as you calculate the pH of milk. In order to get full points you must show all the steps you take.
I need the answer and all the steps.
A liter of milk has a [H+] of about 2.51 × 10–7. (You may prefer to think of the hydronium ion concentration, [H3O+], as 2.51 × 10–7.) Use the formula for the calculation of pH provided and show each step as you calculate the pH of milk. In order to get full points you must show all the steps you take.
ANSWER:
[H+] = [H3O+] = 2.52 * 10^-7M
pH = -log [H+]
pH = -log [2.51*10^-7]
pH = -[-6.60]
pH = 6.60
Hope this helps :)
Calculate the total number of ions in 3. 93 mol MgCl2
The total number of the ions in the 3.93 mol of the MgCl₂ is 7.09 × 10²⁴ ions .
The chemical equation is as follows :
MgCl₂ ---> Mg⁺ + 2Cl⁻
The total number of the ions of MgCl₂ = 1 Mg⁺ + 2 Cl⁻
The total number of the ions of MgCl₂ = 3 ions
The number of the moles of the MgCl₂ = 3.93 mol
1 mole of the substance = 6.022 × 10²³ ions
The total number of the moles of substance = 3 × 3.93 × 6.022 × 10²³ ions
The total number of the moles of ions = 7.09 × 10²⁴ ions
Thus, the total number of the ions of the MgCl₂ is 7.09 × 10²⁴ ions .
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In osmosis, if a membrane separates two solutions, liquid will tend to move from
the side with the stronger solution to the side with the weaker solution. A tea bag
is placed inside a cup of hot water. Which best describes the process of osmosis
in this situation?
1.Osmosis does not occur because the hot water is the only solution.
2.The water, having a stronger concentration, moves inside the tea bag.
3.The water near the tea leaves, having a stronger concentration of tea,
moves outside the tea bag.
4.The tea leaves, having a weaker concentration, release their juices
into the water.
Answer:
2.The water, having a stronger concentration, moves inside the tea bag.
Explanation:
This is a form of osmosis called hypotonic, in which a solution with higher amounts of fluids than the cell will cause the cell to swell and expand. The opposite happens in hypertonic when the solution has fewer fluids than the cell, causing the cell to shrink. Essentially the liquid moves from the higher concentration to the lower one.
Question 9 (1 point) H₂PO₂ (aq) + 3NaOH(aq) A 25 mL sample of 4 M NaOH is necessary to neutralize 50 mL of NaOH (aq). What was the concentration of the sodium hydroxide solutions?
The concentration of the H₂PO₂ solution was 0.66 M.
How to determine the concentration of the sodium hydroxide solutions ?
The balanced chemical equation for the reaction between H₂PO₂ and NaOH is:
H₂PO₂ (aq) + 3NaOH(aq) → Na₃PO₄(aq) + 2H₂O(l)
From the equation, we can see that 3 moles of NaOH are required to react with 1 mole of H₂PO₂.
Let's start by calculating the number of moles of NaOH that reacted with the H₂PO₂:
moles of NaOH = concentration x volume = 4 M x 0.025 L = 0.1 moles
Since 3 moles of NaOH are required to react with 1 mole of H₂PO₂, the number of moles of H₂PO₂ present in the reaction is:
moles of H₂PO₂ = 0.1 moles / 3 = 0.033 moles
Now, let's use the volume of the H₂PO₂ solution to calculate its concentration:
concentration of H₂PO₂ = moles / volume = 0.033 moles / 0.05 L = 0.66 M
Therefore, the concentration of the H₂PO₂ solution was 0.66 M.
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please separate them so I can put it in the right box AND
PLEASE DON'T GET IT FROM WEBSITE MAKE UP YOUR OWN
if it's right Phases of Matter—Comic Strip Template
Instructions: Create a comic strip detailing the adventure of your character as the character is exposed to thermal energy, causing it to undergo phase changes from a solid, to a liquid, to a gas. Place drawings inside the boxes and written content on the lines below each box.
Your presentation must include the following:
title and introduction of your character, including what substance it is made of
source of thermal energy your character encountered (conduction, convection, and/or radiation)
detailed description and/or diagram of the particle transformation from solid to liquid phase
detailed description and/or diagram of the particle transformation from liquid to gas phase
Title of your comic strip: __________________________
________________________
________________________
________________________
________________________
________________________
________________________
________________________
________________________
________________________
________________________
________________________
________________________
________________________
________________________
________________________
________________________
________________________
________________________
will make brainiest :)
Title of your comic strip: Adventures of Ice Cube.
So, the title will be "Adventure of Ice Cube".
Define the term title.
The term title refers to the name or heading given to a book, article, movie, piece of music, or other creative work that identifies it and distinguishes it from other works. It can also refer to a position or designation given to a person, such as a job title or academic title.
Box 1:
Introduction of character: Meet Ice Cube, a small, square-shaped piece of ice made of water molecules. Ice Cube was comfortably sitting in a glass of water until he was exposed to thermal energy.
Caption: This is Ice Cube. He is made of water molecules.
Box 2:
Source of thermal energy: A warm hand holding the glass of water.
Caption: Suddenly, a warm hand holds the glass of water.
Box 3:
Solid to liquid phase: Ice Cube starts to melt and becomes a liquid as it absorbs thermal energy from the warm hand.
Caption: Ice Cube starts to melt as he absorbs thermal energy from the warm hand.
Box 4:
Liquid to gas phase: Ice Cube continues to absorb thermal energy, and as a result, it transforms into water vapor and evaporates into the air.
Caption: As Ice Cube continues to absorb thermal energy, it transforms into water vapor and evaporates into the air.
Box 5:
Conclusion: Ice Cube's adventure comes to an end, but he realizes that he is never really gone, as his water molecules will always be a part of the water cycle.
Caption: The end. Ice Cube is gone, but his water molecules will always be a part of the water cycle.
Box 6:
Additional Information: Show the water cycle and explain how Ice Cube's water molecules can be a part of it.
Caption: Ice Cube's water molecules will eventually come together with other water molecules to form clouds and rain. Then, they will flow into rivers and oceans, and the cycle starts again.
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Identify the Lewis base in this balanced equation:
A Lewis base compound has a pair of electrons that are 'donated' to an electron-acceptor forming a covalent bond. A Lewis Base will have lone-pair electrons. All anions are Lewis Bases considering they donate electrons.
Is NH3 a Lewis base?Image result for Identify the Lewis base in this balanced equation: Identify the Lewis base in this balanced equation: - 1
The lone pair on the nitrogen atom is transferred to the hydrogen ion, making the NH3 a Lewis base while the H+ is a Lewis acid.
Is BF3 a Lewis base?Image end result for Identify the Lewis base in this balanced equation: Identify the Lewis base in this balanced equation: - 1
BF3 is a Lewis acid, but be aware it has no H to donate, it represents a new type of acids.
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Answer:NH3
Just know I got it wrong so you can get it right
A contained sample of hydrogen gas is at 30°C and exerts a pressure of 0.45 atm. What will be the new pressure if the gas cools to -14°C and the volume remains constant?
Answer: .38 atm
Explanation:
p2= p1 x t2 / t1
0.45 x 259.15 / 303.15