Answer:
[tex]\Delta U=-1,441J[/tex]
Explanation:
Hello!
In this case, since the first law of thermodynamics explains how the heat added to the system and the work done by the system equals the change in the internal energy of the system, we can write:
[tex]\Delta U=Q-W[/tex]
Next, since the system releases 241 J of energy (negative on the previous equation) and does 1.20 kJ (1200 J) of work, the change in the internal energy turns out:
[tex]\Delta U=-241kJ-1,200kJ\\\\\Delta U=-1,441J[/tex]
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What describes using organisms that were only alive during a specific time period to estimate the unknown age of items?
Group of answer choices
Radioactive dating
Law of superposition
Relative dating
Index fossils
Answer:
index fossil
Explanation:
More points for the world
Answer:
thaaaaaaaaaaaannnnkssss
Explanation:
sssssssssssssss
Answer:
jgiuufiydifiydifiyfkhditdihfkcgdraoyfufhkdoyfhvljcohchochcofohfoydoyfiyfohc
Explanation:
kxydutdoufuodyiflfjslufkysluftwykdhmdtwkggjaurq arrival arrival
A hard substance that has a high melting point and is a poor conductor of electricity in the solid phase could be
A) CO2
B) Mg
C) NaCl
D) CCl4
Answer:
C) NaCl
Explanation:
A hard substance that has a high melting point and is a poor conductor of electricity in the solid phase could be NaCl
This because it is an ionic compound.
Ionic compounds are formed via the electrostatic attraction between oppositely charged ions. Ionic substances have high melting point as solids and as liquids, they have a high boiling point. In aqueous solutions or in molten form, ionic compounds can conduct an electric current using free mobile ions as carriers. In solid state, the ions are arranged into a crystal lattice and will not conduct a current of electricity.Compounds like NaCl, MgO, NaF are in this category.
The hard substance that has a high melting point and is a poor conductor of electricity in the solid phase could be NaCl.
ElectrolytesElectrolytes are substances which conduct electricity when in the molten or solution state.
Properties of Electrolytes.They are solids with high melting pointsThey conduct electricity in the molten or solution state. Thus they were poor conductors in the solid state.They are usually acids, salts or bases.Examples are NaCl, KCl, HCl, KOH, etc.Ionic compoundsIonic compounds are compounds which are composed of oppositely charged ions held together by strong electrostatic forces. Ionic compounds all are electrolytes .
Properties of Ionic compounds They are solids with high melting points They are crystalline in nature They conduct electricity. Examples are NaCl, KCl, etc.Therefore, the hard substance that has a high melting point and is a poor conductor of electricity in the solid phase could be NaCl.
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which word or words best describe Haversian systems?LigamentLigamentBone Bone marrowmarrowCircular Circular structuresstructuresCartilageCartilage
For the following reaction (production of ethanol) C2H4 +H2O——>C2H5OH
A. How many moles of water will be used to produce 10 mol of C2H5OH
B. If you need to produce 27 mol C2H5OH how many moles of C2H4 will be used?
Answer:
A: 10 moles of water are required.
B: 27 moles of C₂H₄ are used.
Explanation:
A:
Given data:
Moles of water used = ?
Moles of C₂H₅OH formed = 10 mol
Solution:
Chemical equation:
C₂H₄ + H₂O → C₂H₅OH
Now we will compare the moles of water with C₂H₅OH from balance chemical equation:
C₂H₅OH : H₂O
1 : 1
10 : 10
10 moles of water are required.
B)
Given data:
Moles of C₂H₄ used = ?
Moles of C₂H₅OH formed = 27 mol
Solution:
Chemical equation:
C₂H₄ + H₂O → C₂H₅OH
Now we will compare the moles of C₂H₄ with C₂H₅OH from balance chemical equation:
C₂H₅OH : C₂H₄
1 : 1
27 : 27
27 moles of C₂H₄ are used.
You are asked to determine the identity of an unknown liquid and can measure only one physical property. You heat the liquid and record that the liquid turns to vapor at 100°C.
Which physical property does this demonstrate?
A. boiling point
B. malleability
C. ability to conduct electricity
D. melting point
Answer:
A. boiling point
Explanation:
I'm not good at explaining science but...
Heating- keyword
I would take out b and c because you don't need heat for those.
When it's liquid, it would boil, not melt.
Vapor is also a sign of boiling.
How many pi bonds are in the oxalate ion (C2O42-)?
Answer:there are 13
Explanation:
There are two types of chemical compound one is covalent compound and another is ionic compound in chemistry. In ionic bonds, electrons are completely transferred. Therefore, there are 2 pi bonds in oxalate ion C[tex]_2[/tex]O[tex]_4[/tex]²⁻.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
Covalent compounds are formed by covalent bond and ionic compounds are formed by ionic bond. Covalent bond is formed by sharing of electron and ionic bond are formed by complete transfer of electron. Ionic bonds are stronger than covalent bonds. The melting and boiling points are higher in ionic compounds. There are total 2 pi bonds in oxalate ion C[tex]_2[/tex]O[tex]_4[/tex]²⁻.
Therefore, there are 2 pi bonds in oxalate ion C[tex]_2[/tex]O[tex]_4[/tex]²⁻.
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Choose the mole ratio below that is INCORRECT based on the given balanced equation:
2 C2H5OH + 7 O2 --> 4 CO2 + 6 H2O
O 2 moles C2H5OH = 4 moles CO2
O 7 moles O2 = 2 moles C2H5OH
O 4 moles CO2 = 4 moles O2
O 6 moles H2O = 7 moles O2
Answer:
4 moles CO₂ = 4 moles O₂
Explanation:
The incorrect mole ratio is 4 moles CO₂ = 4 moles O₂.
Let us write the reaction equation:
2C₂H₅OH + 7O₂ → 4CO₂ + 6H₂O
To write mole ratios in a chemical reaction, we must ensure the equation is balanced.
Since the given expression is balanced,
Then 4 moles CO₂ = 4 moles O₂ is not correct;
Rather;
4 moles CO₂ = 7 moles O₂ is the right expression
Which term is the rate at which work is done
Answer: power
Answer:
Power
Explantaion:
You said it yourself...
Which is NOT correct for when the silver and vanadium half-cells are connected via a salt bridge and a potentiometer
The question is incomplete, the complete question is
Which is NOT correct for when the silver and vanadium half-cells are connected via a salt bridge and a potentiometer? Ag^+ + 1 e^- rightarrow Ag Edegree = 0.7993 V V^2+ + 2e^- right arrow V E degree =-1.125 V Ag+ is reduced V is oxidized 1.924 V V2^+ is reduced Ag is oxidized I and II III, IV, and V I, II, and III III only IV and V
Answer:
only IV and V
Explanation:
If we look at the values of reduction potential for the two species, we will discover that vanadium has a negative reduction potential indicating its tendency towards oxidation.
On the other hand, solve has a positive reduction potential indicating a tendency towards reduction.
This implies that vanadium must be oxidized and silver reduced and not the not her way ground? Hence the answer above.
wich of the following is hereditary materials found in human and almost all organism
What does Le Châtelier's principle state?
Similar cells with the same function, all working together for the same purpose, form the 2nd level of organization in an organism. This level is called a(n)
Answer:
tissue
Explanation:
cell→tissue→organ→systems→organism
Polarity and intermolecular forces gizmo assessment
What type of bond will result if the atoms below combine? The electronegativity of each atom is given.
Cs0.79
F4.0
Answer:
Ionic or electrovalent bonds
Explanation:
The bond type that will result when the two atoms combine is an electrovalent or ionic bond. This is due to the large electronegativity difference between the given species.
An ionic bond usually forms between metals and non-metals. The metal being electropositive has a very low electronegativity value. Non-metals are electronegative. The Cs will lose it electrons to F This leaves a net negative charge on F and a net positive charge on Cs.The type of bond that will result if the atom Cs and F combine will be an electrovalent bond or ionic bond.
From the given atom, Caesium Cs with an electronegativity of 0.79 is a Group 1 metal which is an alkali metal.
Fluorine F with electronegativity 4.0 is a member of the halogen family.
An Electrovalent bond or ionic bond is a type of bonding reaction that occurs between group 1 metals and group 7 elements due to the high difference in their electronegativities.
Therefore, Cs and F form CsF via electrovalent bonding or ionic bonding with one another.
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Classify the following bonds as ionic, polar cova-
lent, or covalent, and give your reasons: (a) the
SiSi bond in Cl3SiSiCl3, (b) the SiCl bond in
Cl3SiSiCl3, (c) the CaF bond in CaF2, (d) the NH
bond in NH3.
Answer:
a) Covalent
b)Polar Covalent
c)Ionic
d)Coordinate Covalent
Explanation:
The SiSi bond in Cl3SiSiCl3 is covalent, the SiCl bond in Cl3SiSiCl3 is polar covalent, the CaF bond in CaF2 is ionic and the NH bond in NH3 is covalent.
What is covalent bond?The covalent bond is defined as a chemical bond that involves sharing of an electron pair between the atoms.
A covalent bond formed when there difference is the electronegativities of two atoms is too small for an electron transfer to occur to form ions.
The ionic bond is defined as a form of a chemical connection in which one atoms loses valance electrons and gain them from another.
A ionic bond is formed by interaction of oppositely charge ions .
Thus, SiSi bond in Cl3SiSiCl3 is covalent, the SiCl bond in Cl3SiSiCl3 is polar covalent, the CaF bond in CaF2 is ionic and the NH bond in NH3 is covalent.
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A bottle with a mass of 6.8 g has 23.1 mL of a liquid placed in it. The combined mass of the bottle and the liquid is now 48.8 g. Find the density of the liquid. Give the correct number of significant figures in the answer according to the rule.
Answer:
d = 1.8 g/mL
Explanation:
Given data:
Mass of bottle = 6.8 g
Volume of liquid = 23.1 mL
Mass of bottle + liquid = 48.8 g
Density of liquid = ?
Solution:
First of all we will calculate the mass of liquid.
Mass of liquid = combined mass - mass of bottle
Mass of liquid = 48.8 g - 6.8 g
Mass of liquid = 42 g
Density of liquid:
d = m/v
d = 42 g/ 23.1 mL
d = 1.8 g/mL
Where do genetic traits originate and how are they passed from one generation to the next?
In UV region measurements, the üsed cell must be Oa. Plastic cell O b. KBr cell C. Fused silica cell d. Glass cell
Answer:
i think it is d Glass cell
Explanation:
The mercury-201 nuclide radioactively decays by electron capture. Write a balanced nuclear chemical equation that describes this process.
Answer:
Explanation:
Electron capture is a form of beta decay in which the nucleus of a radionuclide captures an electron. In the case of mercury-201, the equation below illustrates that
²⁰¹₈₀Hg + ⁰₋₁e ⇒ ²⁰¹₇₉Au
As can be seen above, the electron capture reduces the atomic number by one unit leading to the production of a new radioisotope (because of the change in atomic number).
Electrical energy can produce many other types of energy.
When electricity runs through the speaker of a stereo, what other types of energy are produced?
A. sound energy
B. energy of motion
C. chemical energy
D. light energy
If I wanted to convert from nanograms to centigrams which directions would I move my decimal?
Right or Left
Answer:
Left
Explanation:
To convert from Nanograms to centigrams, you have to move the decimal to the left hand side.
1 nanograms = 1 x 10⁻⁹g
1 centigrams = 1 x 10⁻² g
So to convert from nanograms to centigrams,
Multiply by 1 x 10⁻⁷ or move 7 places to the left
sodium will do an ionic with
1. bromine
2. magnesium
3. potassium
4. element in group 2
What's the molality of a solution with 120 g of NaCl and 30 kg of water?
Answer:
0.07mol/kg
Explanation:
Given parameters:
Mass of NaCl solution = 120g
Mass of water = 30kg
Unknown:
Molality of the solution =?
Solution:
The molality of a solution is the number of moles of the solute per mass of the solution.
Molality = [tex]\frac{number of moles of solute}{mass of solution}[/tex]
Number of moles of NaCl = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of NaCl = 23 + 35.5 = 58.5g/mol
Number of moles of NaCl = [tex]\frac{120}{58.5}[/tex] = 2.05mole
So;
molality = [tex]\frac{2.05}{30}[/tex] = 0.07mol/kg
Answer:
0.068
Explanation:
⦁ Which of the following has the greatest Fe content: FeS, Fe2(SO4)3, or FeCl2? Complete calculations must be shown to support your choice. (
Answer:
Fe2(SO4)3 has the greater iron content.
Explanation:
Hello!
In this case, considering the content of a specific element in a compound, we must take into account the subscript is has in the formula, for instance FeS has one iron atom, Fe2(SO4)3 has two iron atoms and FeCl2 has one iron atom; thus, by assuming one mole of each compound, we can compute the moles of iron there:
[tex]n_{Fe}^{FeS}=1molFeS*\frac{1molFe}{1molFeS}=1molFe \\\\n_{Fe}^{Fe_2(SO_4)_3}=1molFe_2(SO_4)_3*\frac{2molFe}{1molFe_2(SO_4)_3}=2molFe\\\\n_{Fe}^{FeCl_2}=1molFeCl_2*\frac{1molFe}{1molFeCl_2}=1molFe[/tex]
It means that Fe2(SO4)3 would have the greatest iron content.
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What is the frequency of a photon that has 3.82 x 10^-20 J of energy?
Answer:
5.73498*10^13
Explanation:
............
If you have a voltage of 120 volts entering your house and a light bulb with 0.625 amperes flowing through it, how many watts is your light bulb?
Plzzzz help right answer gets a Brainly!
Answer:
75 watts
Explanation:
Explain what is wrong with the following structure.
Answer:
oxygen should be the central atom in the middle
Explanation:
hydrogens always go on the outside
Hydrogen cannot have more than two electrons.
Hydrogen bonds to only one other atom at a time.
There are too many electrons in the final structure.
Match the era on the left with its characteristic on the right.
Mesozoic
?
The first era
Cenozoic
?
The era before the current
one
Paleozoic
?
When life first flourished
on Earth
2
Precambrian
?
The current era
PREVIOUS
Answer:
Mesozoic - the era before the current one
Cenozoic - the current era
Paleozoic - when life first flourished
Precambrian - the first era
Explanation:
The Precambrian is the earliest part of Earth's history, the first era. It's named like this because it preceded the Cambrian - the first period of the Phanerozoic eon, which is the current geologic eon. It lasted from the beginning of Earth (about 4.6 billion years ago) to the beginning of the Cambrian Period (about 541 million years ago).
Paleozoic is an era that lasted from about 541 to about 252 million years ago. During this time, life began to flourish.
Mesozoic is an era that lasted from about 252 to 65 million years ago. It's the era that took place before the current one - the Cenozoic.
If 20.00 moles of KClO3 react, how many molecules of O2 will form?
Answer:
30
Explanation:
20 KClO³ —> 30 O² +.....
HELPPP FAST
a. list the following from the smallest atomic size to the largest atomic size.
aluminum, chlorine, magnesium, sodium
sodium
magnesium
aluminum
chlorine