Chemistry High School
Answers
Answer 1
Identify the molecular shape of each lewis structure we have that:
1. Trigonal pyramidal
2. Tetrahedral
3. Trigonal planar
4. Bent
What is Lewis structure?
For an understanding through pictures of the location of electrons in an atom, we represent electrons as dots around the element symbol. The number of electrons available for bonding is indicated by unpaired dots. These symbols are called Lewis symbols.
The Lewis structure shows the formation of bonds in a molecule, as well as the atoms involved and the valence electrons of each of them, in this case was Trigonal pyramidal; Tetrahedral; Trigonal planar; Bent.
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Related Questions
What is the formula for calculating the change in thermal energy?
Answers
Answer: :Change in thermal energy = mass x specific heat capacity x change in temperature.
Explanation: what it basically means is mass x heat x the change in temperature.
Change in thermal energy = mass x specific heat capacity x change in temperature.
What do makeup experts use in order to create different skin effects?
Answers
Answer:
on-skin silicone, liquid latex, and gelatine
Explanation:
hope this helps:)
how do atoms show both unity and diversity
Answers
Answer: As one atomic dipole nears another atom it will affect the electron density distribution, so for example if the slightly positive end of the atom is located next to another atom, it will attract the electron(s) in the other atom. A covalent bond happens when atoms share an electron between them. The other kind of bond is called ionic, and it happens when one atom gives an electron to another atom. These bonds are held together with electric forces. Two atoms of the same element can be different if their electrons are in different states. If one copper atom has an electron in an excited state and another copper atom has all of its electrons in the ground state, then the two atoms are different.
Answer:
there are relatively few atoms but they can make many molecules
Explanation:
Devices that use a liquid spray to remove pollutants from the air are called __________. A) alloys B) particulates C) scrubbers D) minerals E) chlorofluorocarbons (CFCs)
Answers
Devices that use a liquid spray to remove pollutants from the air are called scrubbers. The correct option is C.
What is a wet scrubber?
Wet scrubber is a pollution removing technique from the air. It is a sprayer which trap the harmful gas molecules from the air.
It is used in factories and industrial exhaust steams.
Thus, the correct option is C. scrubbers.
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kindly help me
i am confused
i will mark you brainlist
Answers
Explanation:
a) 2(Cr)³++3BiO3-+4H+→3(Bi)3++Cr2O72-+2H2O
b)
have posted a similar question in the image for the phosgene i hope it helps little
Drag each tile to the correct box a chemical reaction takes place in which energy is released arrange the reactions characteristics in order from start to finish
Answers
The characteristics of a chemical reaction are:
The lower energy of reactants → Transition state → High energy of products.
What is a chemical reaction?
A chemical reaction is a process in which one or more substances, also called reactants, are converted to one or more different substances, known as products.
The characteristics of a chemical reaction are :
Lower energy of reactants
↓
Transition state
↓
High energy of products
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What is the oxidation number of sulfur in na2s2o3 ?.
Answers
Answer:
Therefore, the oxidation state of sulphur atoms in Na2S2O3 is −2 and +6.
Why do fireworks produce heat when they explode?
Answers
a fuse is attached to gunpowder present below the shell. when this fuse is ignited with a flame, the gunpowder explodes creating heat and gas that cause a buildup of pressure beneath the shell. hope this helps :)
A helium balloon with an internal pressure of 1.00 atm and a volume of 4.50 L at 20.0˚C is released. What volume will the balloon occupy at an altitude where the pressure is 0.600 atm and the temperature is –20.0˚C?
GAS LAW:
Given:
Unknown:
Formula:
Solution:
FInal Answer: V2 =
Answers
hey there!
The Gas law is COMBINED GAS LAW
GIVEN :
P1=1.00 atmp
V1=3.50 lit
T1 = 20.0°C = 293K
P2=0.600 atmp
T2=-20.0°C=253K
Now,
Formula =>
P1V1/T1 =P2V2/T2
=> V2 = (P1/P2)(T2/T1)(V1)
=> V2 = (1.00/0.60)(253/293)(3.50)
=>V2 = 5.01403 L
=> V2 = 5L (approx).
Please Hurry And Answer This Question! :)
Which Compound can be used to preserve biological specimens?
1/2/3?
Answers
Biological specimens are the preserved remains of the biological materials. Compound A. formaldehyde or formalin is used to preserve the specimens. Thus, option A is correct.
What are fluid-preserved specimens?
Fluid preserved specimens are the biological material of the organism that are kept at the store to study and analyze over a long time without getting any damage. Formaldehyde along with alcohol is the most common preservative.
Formaldehyde is an organic compound that is colorless and pungent in the smell that preserves the dead remains of the organisms intact. It is antiseptic and germicide in nature that makes them best for the purpose.
Therefore, option A. formaldehyde is used to preserve the specimens.
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Answer:
so i put a...
Explanation:
Edge doesnt give correct answers on unit tests, but i passed with an 88 :)
Correct me if im wrong!!
Name these compounds according to IUPAC. (ASAPP)
Answers
The chemical's IUPAC names of the given compound are propanal and acetone.
What is IUPAC naming?
IUPAC is the international union of practical and applied chemistry. It set rules for standard naming of the compound.
Propanal, or propanaldehyde, is an aldehyde that has one double bond and one oxygen atom.
Acetone is a kind of ketone. Ketones have the functional group R2CO.
Thus, chemical's IUPAC names of the given compound are propanal and acetone.
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In relation to us, galaxies are doing what?
Answers
Answer:
Moving away from us
Explanation:
I believe this is the answer. Sorry if it's incorrect, I'm not very good in this subject.
1. How is a bicycle race like a chemical reaction? The Tour de France is one of the most famous bicycle races in the world. It is held from mid-July to early August every year. During the race, cyclists travel almost 4000 kilometers. At one stage of the race, riders must cross steep mountains with heights of 1900 meters or more. The riders need extra energy to ride through these steep mountains.
Answers
During the riding of the steep mountain, the body needs more energy because going up consume more energy and oxygen due to additional effect of gravity on your momentum.
What is the effect of cycling?
Cycling is a good exercise as swimming, while cycling, happy hormones are released like dopamine and serotonin.
The primary forces that work while cycling are gravity, friction, rolling resistance, and air resistance.
Thus, During the riding of the steep mountain, the bod needs more energy because going up consume more energy and oxygen due to additional effect of gravity on your momentum.
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Fe2O3 (s) + 3CO (g) -----> 2Fe (l) + 3CO2 (g)
How many moles of Fe2O3 must react to produce 760 kg of Fe? (please tell me how you get the answer...)
Answers
The number of moles of Fe₂O₃ that must react to produce 760 kg of Fe are 20.503
What are moles?
The mole is a SI unit of measurement that is used to calculate the quantity of any substance.
The reaction is [tex]\rm Fe_2O_3 (s) + 3CO (g) ----- > 2Fe (l) + 3CO_2[/tex]
The mass of Fe is given 760 kg
The molar mass of Fe is 55.9 g/mol
To calculate the number of moles
[tex]n = \dfrac{m}{M} \\\\n = \dfrac{760000}{55.9 g/mol} = 13,669[/tex]
Now, the ratio between Fe and O is 2 : 3
[tex]\dfrac{13,669}{2} \times 3 = 20,503.5[/tex]
convert it into kg = 20.503 mol
Thus, the moles are 20.503 mol
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Jack would probably say his lines with a _______ voice.
A. puzzled
B. delighted
C. whining
Answers
A. because he might be in trouble in a play
Which of the following is the best hypothesis?
OA. Physical changes are much less interesting to watch than
chemical changes.
B. If sodium carbonate is added to vinegar, the reaction will absorb
heat.
C. Tearing a piece of paper is an example of a physical change.
D. Some chemical reactions absorb heat, and others release heat.
SUBMIT
Help me y’all
Answers
Answer:
B.) If sodium carbonate is added to vinegar, the reaction will absorb heat.
Explanation:
A.) is incorrect because this is not testable. Rather, it is just an opinion that cannot be proven correct or incorrect.
B.) is correct because this statement is testable. Tests need to be run to determine the accuracy of the statement.
C.) is incorrect because this statement explains something that does not need to be tested. It is an example of a physical change when one tears a piece of paper.
D.) is incorrect because this is already a true statement. It is obvious that not all reactions absorb/release heat. While tests could be run to further prove this statement true, it is already considered accurate.
B is correct
Which of the following is the best hypothesis?
OA. Physical changes are much less interesting to watch than
chemical changes.
B. If sodium carbonate is added to vinegar, the reaction will absorb
heat.
C. Tearing a piece of paper is an example of a physical change.
D. Some chemical reactions absorb heat, and others release heat.
SUBMIT
Help me y’all
How many moles of gas will occupy a volume of 2.5 l at 12.0 atm and 25c?
Answers
Answer:
1.23 moles
Explanation:
Ideal gas law
PV = n RT R = .082057 L-atm/mol-K
25 C = 298.15 K
12 (2.5) = n (.082057) (298.15) n = 1.23 moles
12 Describe In your own words, describe the glassblowing process.
Answers
Explanation:
To give the glass its final shape and size, it is blown into with a blowpipe, creating a sort of bubble of glass. To carry out this process, the blowpipe holding the glass must be placed on a steel stand. Then, the glass artist has to blow into the blowpipe while rotating it at the same
[Then mother noticed that two children who are watching the game are sick and coughing.She told her son to keep distance from those children to avoid getting sick]
1.Observe illustration no.1 and read the caption.Why did the mother ask her son to avoid the kid with cough?
2.Observe illustration no.2 and read the caption.Why did the mother let her son play with the kid with asthma?
please don't report this
Answers
Answer:
in illustration 1
the mother told her son not to play with the boy having cough because it is a transferable disease which could cause him also to get sick and would get cough.
while in
illustration 2
the mother let the boy play with the boy having asthma because it is not a transferable disease which wold not affect him or any one else.
Explanation:
this is the reason
#1
Cough is a infectious disease .It spreads through the droplets falling outwards during coughing.If her son stays there for long time he would be affected by cough also or he would get sick .So the mother denied .
#2
Asthama is although a disease of lungs but it doesn't spread through air or droplets.It's not infectious .So nothing would happen if her child plays
Describe the type of force which exists between particles in an Ideal gas. Explain why this type of force exists between the particles.
Answers
The Intermolecular force is a type of force which exists between particles in an Ideal gas.
What type of force which exists between particles in an Ideal gas?
Intermolecular forces are considered weaker attractions that hold molecules in gas close together. This force of attraction is present between molecules or particles.
So we can conclude that the Intermolecular force is a type of force which exists between particles in an Ideal gas.
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Please help I do not understand
Answers
A model of materials will show dense materials having tightly packed particles while less dense materials will have greater spaces between their particles.
What is density?
Density is a measure of the compactness of a material.
Density is defined as the ratio of mass to the volume of a substance.
Density = mass/volume
Dense materials have tightly packed particles while less dense materials have greater spaces between their particles.
Avogadro's hypothesis applies to substances in gaseous form since they do not have a constant volume.
Therefore, a model of materials will show dense materials having tightly packed particles while less dense materials will have greater spaces between their particles.
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Use the word bank below to complete the statement. Not all of the words will be used.
Word Bank:
sum. Enthalpy. Heat. Total.
Temperature. Moles. -ΔH. +ΔH.
Hess’s Law describes how the ____ energy of a reaction consists of the ___ of the energy changes of the individual step reactions.
Answers
Hess’s Law describes how the heat energy of a reaction consists of the total of the energy changes of the individual step reactions.
What is the statement if Hess's law of constant heat summation?
Hess's law of constant heat summation states that the total heat changes that occur in a reaction is independent of the several intermediate pathways of the reaction, but is a sum of all the heat changes that occur.
Hess’s Law describes how the heat energy of a reaction consists of the total of the energy changes of the individual step reactions.
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In the space below draw a model of the atoms that make up a water molecule to show the charges of each of these atoms chemistry
Answers
Answer:
I didn't draw this but I think they're asking you to draw this
Explanation:
Convert 65 grams of oxygen to moles
Answers
Here we will show you how to convert 65 grams of oxygen to moles of oxygen. Before we begin, note that oxygen (O) is a chemical element that you can find in the periodic table, and grams (g) is a metric measurement.
The atomic mass of oxygen is 15.9994. That means that one mole of oxygen weighs 15.9994 grams (15.9994 grams/moles). We can therefore make the following equation:
Grams × (1/15.9994) = Moles of Oxygen
Now that we have the equation, we can enter 65 grams into it to get 65 grams of oxygen converted to moles of oxygen:
Grams × (1/12.011) = Moles of Oxygen
65 × (1/12.011) = 4.0626523494631035
65 grams = 4.0626523494631035 Moles of Oxygen
65 grams of oxygen is approximately equal to 2.03125 moles.
To convert 65 grams of oxygen to moles, we need to use the molar mass of oxygen (O₂), which is approximately 32.00 g/mol. Oxygen exists as a diatomic molecule (O₂), so we use the molar mass of O₂ to convert from grams to moles.
The formula for converting grams to moles is:
Moles = Mass (in grams) / Molar mass (in grams per mole)
Given:
Mass of oxygen = 65 grams
Molar mass of oxygen (O₂) = 32.00 g/mol
Moles of oxygen = 65 grams / 32.00 g/mol
Moles of oxygen ≈ 2.03125 moles
Therefore, 65 grams of oxygen is approximately equal to 2.03125 moles.
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What is the OH- in a solution with a pOH of 7.68?
Answers
Answer:
Explanation:
Answer: 1.380 × 10^-8 M
The pH is the measure of alkalinity or acidity of a substance.
It is the negative logarithm of H+ ions concentration [H+].
pH = -log[H+]
pOH on the other hand is negative logarith of OH- concentration [OH-].
pOH = -log[OH-]
In this case;
pOH = 7.86
We can calculate the [OH-]
pOH = -log[OH-]
But, pOH = 7.86
pOH = -log[OH-]
-log[OH-] = 7.86
[OH-] = Antilog -7.86
= 1.380 × 10^-8 M
Therefore, [OH-] is 1.380 × 10^-8 M
A semiconductor:
A.
always allows charge to flow.
B.
never allows charge to flow.
C.
cannot be used at normal temperatures.
D.
has characteristics between conductors and insulators.
Answers
Answer:
D. has characteristics between conductor and insulator
An HNO3 (ag) solution has a pH of 1.75. What is the molarconcentration of the HNO3(aq) solution?
Answers
⇒ 0.018
-use pH=-log[H3O+]
-solve for H3O+
If 30.5 g of 15% potassium nitrate solution are reacted to excess magnesium chloride how many grams of potassium chloride will be form
Answers
Here the step by step and answer
How many grams of C8H18
is in 405,576.398 mL
Answers
[tex]Molarity X \frac{0.762 mol}{05.576398 L} = Mass[/tex] is the of [tex]C_8H_1_8[/tex] is in 405,576.398 mL.
What is molarity?
Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution. Molarity is also known as the molar concentration of a solution.
Given data:
Molar mass of [tex]C_8H_1_8[/tex] = 0.762 mol
Volume of solution = 405,576.398 mL = 405,576.398 mL/1000 = 405.576398 L
Solution:
Step 1: Calculating moles of [tex]C_8H_1_8[/tex]
•Molarity =[tex]\frac{\;Moles \;of \;solute}{\;Volume \;of \;solution \;in \;litre}[/tex]
•Putting the value in the given formula
•Moles of solute C8H18 = [tex]\frac{\;Mass}{\;Molar \;molar \;mass}[/tex]
•Moles of solute C8H18 = [tex]\frac{\;Mass}{0.762 mol}[/tex]
Now,
Molarity =[tex]\frac{\;Moles \;of \;solute}{\;Volume \;of \;solution \;in \;litre}[/tex]
Molarity =[tex]\frac{\frac{\;Mass}{0.762 mol}}{\;Volume \;of \;solution \;in \;litre}[/tex]
Molarity =[tex]\frac{\frac{\;Mass}{0.762 mol}}{405.576398 L}[/tex]
[tex]Molarity X \frac{0.762 mol}{05.576398 L} = Mass[/tex]
Hence, [tex]Molarity X \frac{0.762 mol}{05.576398 L} = Mass[/tex] is the of [tex]C_8H_1_8[/tex] is in 405,576.398 mL.
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An increase in the population of an organism would most likely be associated with which of the following?
Answers
Answer:
An expansion of suitable living space
Explanation:
Increase occurs in the population of the organism only occurs when there is a suitable environment present for that organism. Suitable environment means that place where all the needs of the organism are available such as food, water and shelter etc. If food and water are present in large amount and decrease in animals occurs that prey on that organism will increase the population of the organism.