Answer:
[tex]E=3.5149kJ[/tex]
Explanation:
Hello.
In this case, for such combustion of hexane which release heat, we can compute that amount by taking into account that the reaction releases 4163.0 kJ of energy every 1 mole of hexane, it means that for 72.78 g, which in moles is:
[tex]n_{hexane}=72.78g*\frac{1mol}{86.20g}=0.8443mol[/tex]
Thus the energy released when 0.8443 moles of hexane are released turn out:
[tex]E=n_{hexane}\Delta _cH=0.8443mol*-4163.0\frac{kJ}{mol}*\frac{1000J}{1kJ} \\\\E=3.5149kJ[/tex]
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Give an example of appliances at home that is connected using a series connection draw the circuit in a series connection
Answer:
Refrigerator
Explanation:
An example of a house-hold appliance whose circuit is connected in series is the refrigerator. The compressor and the thermostat of the refrigerator are connected in series in such a way that when the temperature inside of the refrigerator is high, the thermostat switches the compressor on so as to reduce the temperature inside the refrigerator to a desired level. The series connection of a typical refrigerator is illustrated in the diagram attached.
Some example of electronic appliances at home that are connected using a series connection are: refrigerator, freezer and electric bulbs.
An electric circuit can be defined as an interconnection of electrical components, in such a way that it creates a path for the flow of electric charge (current) with respect to a driving voltage.
Generally, an electric circuit is made up of the following electrical components:
Resistors.Capacitors.Battery.Transistors.Switches.Inductors.When there are electrical devices present in a circuit ,
Basically, two or more electrical components present in an electric circuit with an energy source (power), can be connected or arranged in two (2) forms and these are;
I. Parallel circuit.
II. Series circuit.
A series circuit connection allows only a single path for the flow of current and as such the same amount of current flows through each electrical components, regardless of which is turned ON or used.
Additionally, the negative lead of each electrical component is connected to the positive lead of the next electrical component; therefore, sharing a common current.
In conclusion, some example of electronic appliances at home that are connected using a series connection are:
Refrigerator.Freezer.Electric bulbs.Read more: https://brainly.com/question/24131207
What volume (in mL) of a 0.341 M HCl solution is needed to neutralize 43.9 mL of a 0.480 M NaOH solution
Answer:
61.8 mL
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
HCl + NaOH —> NaCl + H2O
From the balanced equation above,
Mole ratio of the acid (nA) = 1
Mole ratio of the base (nB) = 1
Next, the data obtained from the question include:
Molarity of acid, HCl (M1) = 0.341 M
Volume of base, NaOH (Vb) = 43.9 mL
Molarity of base, NaOH (Mb) = 0.480 M
Volume of acid, HCl (Va) =?
The volume of the acid needed for the reaction can be obtained as follow:
MaVa/MbVb = nA/nB
0.341 × Va / 0.480 × 43.9 = 1/1
Cross multiply
0.341 × Va × 1 = 0.480 × 43.9 × 1
0.341 × Va = 21.072
Divide both side by 0.341
Va = 21.072 /0.341
Va = 61.8 mL
Therefore, 61.8 mL of the acid, HCl is needed for the reaction.
A truck with a mass of 30,000 kg is traveling down a Michigan Highway at a speed of 32 m/s when it sees a roadblock and must come to a sudden stop in 13 seconds. Given a uniform acceleration, find the following:
g Chemical species are said to be isoelectronic if they have the same Lewis structure (regardless of charge). In order to achieve an electron configuration that is isoelectric with a noble gas, nonmetals tend to _____.
Answer:
Accept electrons
Explanation:
Non metals are found towards the right hand side of the periodic table. They usually possess more valence electrons than metals.
Hence, they do not give out electrons as metals do in order to become isoelectronic with the noble gases because this will cost a lot of energy. Rather, they accept electrons in order to become isoelectronic with noble gases.
Isoelectronic means that the both species have the same number of electrons. In accepting electrons, nonmetals form negative charges.
[He] 2s22p
What is the chemical symbol for the atom?
How many electrons does the atom have?
How many 2s electrons are in the atom?
Answer:
Detail is given below.
Explanation:
Electronic configuration:
[He] 2s² 2p⁵
Number of electron in given atom:
we know that the atomic number of helium is 2 it means it has 2 electron.
Thus the number of electron in given atom are 2+2+5 = 9
Symbol of atom:
The number of electron is the atomic number of an atom. Thus it means the given atom has atomic number 9 which is fluorine.
Symbol = F
Properties of fluorine:
1. it is yellow in color.
2. it is flammable gas.
3. it is highly corrosive.
4. fluorine has pungent smell.
5. its reactions with all other elements are very vigorous except neon, oxygen, krypton and helium.
How many 2s electrons are in atom?
There are 2 electron are present in 2s subshell of fluorine.
Plants need to use the gas CARBON DIOXIDE for photosynthesis. true or false
NEED HELP NOW PLZ IM TIMED I WILL GIVE BRRAINLIEST!
Radiation transfers thermal energy through Which accurately completes the statement?
O. waves
O. direct contact
O. particles
O. liquid movement
Answer:
its waves
Explanation:
normally thermal energy is transferred through particles but radiation is an exception and it transfers it through waves instead.
I hope this helped :))
Answer:
WAVES
Explanation:
Aqueous sodium carbonate reacts with aqueous copper(II) chloride to form solid copper(II) carbonate and aqueous sodium chloride. What mass of sodium chloride is produced by 23.9 g of sodium carbonate?
Answer:
Explanation:
Na₂CO₃+ CuCl₂ = CuCO₃ + 2NaCl
106 g ( 1 mole ) 117 g ( 2 moles )
106 gram of Na₂CO₃ produces 117 grams of NaCl
23.9 gram of Na₂CO₃ produces 117 x 23.9 / 106 grams
grams of NaCl produced = 117 x 23.9 / 106 = 26.38 gram .
The mass of sodium chloride is produced by 23.9 g of sodium carbonate is 26.38 g.
What is mass?Mass is defined as the amount of matter in a particle or object is represented by mass, which is a dimensionless quantity.
It is also defined as inertia is a quantitative measure of a fundamental feature of all stuff.
Na₂CO₃+ CuCl₂ --> CuCO₃ + 2NaCl
1 mole of Na₂CO₃ = 106 g
2 mole of NaCl = 117 g
So, 23.9 g of Na₂CO₃
= 117g x 23.9 / 106g
= 26.38 g
Thus, the mass of sodium chloride is produced by 23.9 g of sodium carbonate is 26.38 g.
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20 POINTS
Why are the following not considered modeling?
a simple drawing
a photograph of a phenomenon
a list of observations
a data table
Group of answer choices
They do not include a key
The data collected could have experimental error.
All of these are considered a form of modeling.
They do not explain what is happening using evidence
Answer:
The answer is a messy model.
Explanation:
It's not a limitation, only an inconvenience. Something that's not really neat is still useful. Hope I helped!
A reaction vessel for synthesizing ammonia by reacting nitrogen and hydrogen is charged with 6.29 kg of H2 and excess N2. A total of 29.2 kg of NH3 are produced. What is the percent yield of the reaction?
Answer:
81.9%
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
N2 + 3H2 —> 2NH3
Next, we shall determine the mass of H2 that reacted and the mass of NH3 produced from the balanced equation. This is illustrated below:
Molar mass of H2 = 2 ×1 = 2 g/mol
Mass of H2 from the balanced equation = 3 × 2 = 6 g
Converting 6 g of H2 to kg, we have:
1000 g = 1 kg
Therefore,
6 g = 6 g × 1 kg /1000 g
6 g = 0.006 kg
Molar mass of NH3 = 14 + (3×1) = 17 g/mol
Mass of NH3 from the balanced equation = 2 × 17 = 34 g
Converting 34 g of NH3 to kg, we have:
1000 g = 1 kg
Therefore,
34 g = 34 g × 1 kg / 1000 g
34 g = 0.034 Kg
Summary:
From the balanced equation above,
0.006 kg of H2 reacted to produce 0.034 kg of NH3.
Next, we shall determine the theoretical yield of NH3. This can be obtained as follow:
From the balanced equation above,
0.006 kg of H2 reacted to produce 0.034 kg of NH3.
Therefore, 6.29 kg of H2 will react to produce = (6.29 × 0.034)/0.006 = 35.64 Kg of NH3.
Thus, the theoretical yield of NH3 is 35.64 kg.
Finally, we shall determine the percentage yield of NH3 as shown below:
Actual yield of NH3 = 29.2 kg
Theoretical yield of NH3 = 35.64 kg
Percentage yield of NH3 =?
Percentage yield = Actual yield /Theoretical yield × 100
Percentage yield = 29.2/35.64 × 100
Percentage yield of NH3 = 81.9%
Compound 1 melts at 40 degrees Celsius. Compound 2 melts at 1310 degrees Celsius. Compound 3 melts at
240 degrees Celsius. Compound 4 melts at -62 degrees Celsius. Which is most likely to be an ionic compound?
Compound 4
Compound 2
Compound 3
Compound 1
Answer:
Compound 3 i think
Explanation:
Given that the molar mass of the Red 40 dye is equal to 496.42 g/mol, how many grams of Red 40 food dye were in the 0.235 L solution of drink mix
Answer:
5.21 g
Explanation:
Density of Red 40 = molar mass/molar volume
since the molar volume = 22.4 L
Density of Red 40 = 496.42 g/mol/22.4 L
Density of 496.42 g/mol = 22.16 g/L
But;
density = mass/volume
volume of Red 40 = 0.235 L
mass = density * volume
mass = 22.16 g/L * 0.235 L
mass = 5.21 g
The mass of the red 40 dye in the 0.235 L solution is 5.21 g
We'll begin by calculating the density of the red 40 dye. This can be obtained as follow:Molar mass of red 40 dye = 496.42 g/mol
Molar volume = 22.4 L
Density =?[tex]Density = \frac{mass}{volume}\\\\ = \frac{496.42}{22.4}\\\\[/tex]
Density of red 40 dye = 22.16 g/L
Finally, we shall determine the mass of the red 40 dye in the solution. This can be obtained as follow:Density of red 40 dye = 22.16 g/L
Volume = 0.235 L
Mass of red 40 dye =?
Mass = Density × Volume
= 22.16 × 0.235
Mass of red 40 dye = 5.21 g
Therefore, the mass of the red 40 dye in the solution is 5.21 g
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B How do you think plant and animal cells get the
energy out of glucose?
.
Answer:
.
Explanation:
Which of the following is a solution?
A. Salt water
B. Macaroni and cheese
C. Cake mix
D. Substance floats in water
Answer:
salt water or cake mix but, I'm pretty sure salt water
Answer:
it is sugar i got it right on study island
Explanation:
A 1 liter solution contains 0.384 M acetic acid and 0.512 M sodium acetate. Addition of 0.422 moles of calcium hydroxide will:
Answer:
- Exceed the buffer capacity
- Raise the pH by several units
Explanation:
Will:
(Assume that the volume does not change upon the addition of hydrobromic acid.)
Raise the pH slightly
Lower the pH slightly
Raise the pH by several units
Lower the pH by several units
Not change the pH
Exceed the buffer capacity
1L of a buffer of 0.384M acetic acid and 0.512M of sodium acetate contains 0.384 moles of the acid and 0.512 moles of the salt.
A base as Ca(OH)2 reacts with the acid, CH3COOH as follows:
Ca(OH)2 + 2CH3COOH → Ca(CH3COO)₂ + 2 H2O
For the reaction of the 0.422 moles of calcium hydroxide are required:
0.422 moles Ca(OH)2 * (2 moles CH3COOH / 1 mole Ca(OH)2) = 0.844 moles of CH3COOH
As there are just 0.384 moles of acetic acid:
Exceed the buffer capacity
And:
Raise the pH by several units
-Because the solution becomes more basic-
AlBr3+NH3⇌H3NAlBr3 lewis acid and base
Answer:
See explanation
Explanation:
Even though the question is incomplete, but I believe you want to know the Lewis acid and Lewis base in the reaction; AlBr3+NH3⇌H3NAlBr3.
A Lewis acid is a lone pair acceptor while a Lewis base is a lone pair donor.
If we look at the reactants, AlBr3 has an open sextet hence it must be a lone pair acceptor ( a Lewis acid). NH3 is a lone pair donor owing to the lone pair present on nitrogen atom, hence it a Lewis base.
The reaction can be classified as a an acid-base reaction according to the Lewis definition of acids and bases.
1. Cells must let what into the cell
99% of all matter that can be observed in the universe exist as ...
A plasma
b liquids
c solids
d gases
Calculate the solubility at 25 °C of Ni(OH)2 in pure water and in a 0.0200 M NaOH solution. You'll find K. data in the ALEKS Data tab. Round both of your answers to 2 significant digits
solubility in pure water:
solubility in 0.0200 M NaOH solution:
Answer:
solusoin ( 0.0130 )²
Explanation:
What kind of crystalline solid is MgCl2?
A. lonic
B. Metallic
C. Molecular
OD. Network
ionic solid try this answer I’m sure it’s gonna work
Magnesium chloride is a colorless crystalline solid.MgCl₂ is an ionic compound. Therefore, option A is correct.
What are ionic compounds ?When an atom (or group of atoms) gains or loses electrons, ions form charged particles, forming ionic compounds. A cation is a positively charged ion, whereas an anion is a negatively charged ion.
When a metal reacts with a nonmetal, ionic compounds are (usually) formed or a polyatomic ion.
MgCl2 is an ionic compound because the chemical bonds in the molecule are formed by electron transfers between Mg and Cl atoms. Magnesium is an alkaline earth metal that loses two electrons to form magnesium cation, whereas chlorine is a nonmetal that accepts one electron to form chloride ion.
Thus, option A is correct.
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I know this is basic but, what is the powerhouse if the cell?
50 points!
Answer:
mitochondrion
Explanation:
When temperature drops, the number of collisions between particles increases
True?
False?
Answer:
False
Explanation:
the number of collisions between particles decreases as there is less energy amid the particles
:)
HELPPOOOOOPPPPPPPP MEEEE
Compound 1 melts at 50°C. Compound 2 melts at 210°C. Compound 3 melts at 1240°C. Compound 4 melts at -62°C. Which is most likely to
be an ionic compound?
A. Compound 1
B. Compound 2
C. Compound 3
D. Compound 4
Which periodic family has a full outermost valence shell and rarely reacts with other elements?
Alkali metals
Alkaline earth metals
Halogens
Noble gases
Answer:
The answer would be Noble gases
Noble gases is the periodic family which has a full outermost valence shell and rarely reacts with other element. Therefore, the correct option is option D.
What is periodic table?The organised arrangement of all chemical elements according to the order to increase their atomic number—that is, the total amount of protons within an atomic nucleus—is known as the periodic table, or full periodic chart of the elements. When chemical substances are grouped in this way, a recurring pattern in their properties known as the "periodic law" occurs.
Where substances within the same row (group) exhibit comparable qualities. Dmitry I. Mendeleyev's original discovery, whose was made in the middle of the 19th century, has had immeasurable significance for the advancement of chemistry. Noble gases is the periodic family which has a full outermost valence shell and rarely reacts with other element.
Therefore, the correct option is option D.
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to change a substance from a liquid to a solid, it must be cooled to its
O A. boiling point
O B. melting point
C. coefficient of heat
OD. specific heat
?
Answer:
B. melting point
Explanation:
The melting point is the same as the freezing point. This temperature is when a liquid freezes and becomes a solid, and it is also when a solid melts and becomes a liquid. This is why freezers are set at temperatures lower than the freezing point of water.
Answer:
boiling point
Explanation:
hope this helps
Are organs made of cells true or false
Answer:
true
Explanation:
An organ is made of several types of tissue and therefore several types of cells. For example, the heart contains muscle tissue that contracts to pump blood, fibrous tissue that makes up the heart valves, and special cells that maintain the rate and rhythm of heartbeats.
Answer:
True
Explanation:
Cells make up tissues, which makes up organs
Hope this helps! Good luck :)
What property of matter causes convection currents?
density
mass
volume
weight
Answer:
if i am correct it is density =)
Explanation:
Answer:
density
Explanation:
&*
The volume of ammonia gas at 1.10 atm of pressure is gradually decreased from 93.5 mL to 30.9 mL. What is the final pressure of ammonia if there is no change in temperature
Answer:
P₂ = 3.43 atm
Explanation:
Step 1: Given data
Initial pressure of ammonia (P₁): 1.10 atmInitial volume of ammonia (V₁): 93.5 mLFinal pressure of ammonia (P₂): ?Final volume of ammonia (V₂): 30.0 mLStep 2: Calculate the final pressure of ammonia
We have an ideal gas experiencing a change in volume and pressure with no change in the temperature. We can calculate the final pressure of ammonia using Boyle's law.
P₁ × V₁ = P₂ × V₂
P₂ = P₁ × V₁/V₂
P₂ = 1.10 atm × 93.5 mL/30.0 mL
P₂ = 3.43 atm
Use the ΔH°f and ΔH°rxn information provided to calculate ΔH°f for IF: ΔH°f (kJ/mol) IF7(g) + I2(g) → IF5(g) + 2 IF(g) ΔH°rxn = -89 kJ IF7(g) -941 IF5(g) -840 I2(g) 62.42
Answer:
ΔH°f{IF(g)} = -127.58 kJ/mol
Explanation:
Hello.
In this case, since the information about the chemical reaction is:
IF7(g) + I2(g) → IF5(g) + 2 IF(g) ; ΔH°rxn = -89 kJ / mol
ΔH°f{IF7(g)} = -941 kJ / mol
ΔH°f{IF5(g)} = -840 kJ / mol
ΔH°f{I2(g)} =62.42 kJ / mol (it should be 0 since I2 is a pure element that is nor formed by other elements, however, we will use the given value).
Since we don't know the enthalpy of formation of IF, but the enthalpy of reaction for this one is:
ΔH°rxn = ΔH°f{IF5(g)} + ΔH°f{IF(g)} - ΔH°f{IF7(g)} - ΔH°f{I2(g)}
We can obtain it via:
ΔH°f{IF(g)} = ΔH°rxn - ΔH°f{IF5(g)} + ΔH°f{IF7(g)} + ΔH°f{I2(g)}
ΔH°f{IF(g)} = -89 - (-840) + (-941) + 62.42
ΔH°f{IF(g)} = -127.58 kJ/mol
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