Answer:
[tex]\Delta H_{dep}=-46.68kJ/mol[/tex]
Explanation:
Hello!
In this case, since vaporization is the processes by which a liquid goes to the gas phase, fusion by which a solid goes to liquid and deposition by which a gas goes to solid; we infer that the following set up relates the enthalpies associated to each process:
[tex]\Delta H_{fus}+\Delta H_{vap}=-\Delta H_{dep}[/tex]
Because deposition goes from a state with more energy to a state with less energy, therefore it is negative; in such a way, by plugging in we obtain:
[tex]\Delta H_{dep}=-(\Delta H_{fus}+\Delta H_{vap})\\\\\Delta H_{dep}=-(6.01kJ/mol+40.67kJ/mol)\\\\\Delta H_{dep}=-46.68kJ/mol[/tex]
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What is the term used to describe a phase change from liquid to solid?
When a liquid changes into a solid, it is called solidification. When a gas changes into a solid, it is called deposition . When a liquid changes into gas, it is called evaporation. Phase changes are usually caused by changes in temperature or pressure.
iodid ion is oxidized to hypoiodite ion by permanganate what is the ratio of hydroxide ions to iodide ions in balanced equation
Answer: The ratio of number of hydroxide ions to iodide ions is 2 : 1.
Explanation:
The chemical equation for the oxidation of iodide ion is oxidized to hypoiodite ion by permanganate follows:
[tex]2MnO_4^-+I^-+H_2O\rightarrow 2MnO_2(s)+IO_3^{-}+2OH^{-}[/tex]
According to mole concept:
1 mole of a substance contains [tex]6.022\times 10^{23}[/tex] number of particles
Moles of iodide ions = 1 mole
Number of iodide ions = [tex](1\times 6.022\times 10^{23}[/tex]
Moles of hydroxide ions = 2 mole
Number of hydroxide ions = [tex](2\times 6.022\times 10^{23}[/tex]
Taking the ratio of number of hydroxide ions and number of iodide ions are as follows:
[tex]\frac{\text{Number of hydroxide ions}}{\text{Number of iodide ions}}=\frac{(2\times 6.022\times 10^{23})}{(1\times 6.022\times 10^{23})}\\\\\frac{\text{Number of hydroxide ions}}{\text{Number of iodide ions}}=\frac{2}{1}[/tex]
Hence, the ratio of number of hydroxide ions to iodide ions is 2 : 1.
What are the relationships between temperature and viscosity of water?
Explanation:
Both cohesion and molecular interchange contribute to liquid viscosity. The impact of increasing the temperature of a liquid is to reduce the cohesive forces while simultaneously increasing the rate of molecular interchange. The former effect causes a decrease in the shear stress while the latter causes it to increase.
temperature?
The viscosity of liquids decreases rapidly with an increase in temperature, and the viscosity of gases increases with an increase in temperature. Thus, upon heating, liquids flow more easily, whereas gases flow more sluggishly.
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Ashley is preparing for a speech about the tentacular feeding pattern of the corals. Help her complete the sentences. Corals have tentacles near the oral opening. The tentacles comprise cells called . These cells contain used by corals to sting the prey and stun them using the tentacles.
Answer:
Stinging cell, nematocysts.
Explanation:
Corals have tentacles present near the oral opening. The tentacles comprise cells called stinging cells. These cells contain nematocysts used by corals to sting the prey and stun them using the tentacles. These stinging cells present near the mouth which contains nematocysts that is an organelle that produces toxic substances used by the coral to catch their prey.
Your friend uses a wire coil to model how a sound wave moves. What is an advantage to using
the spring coil as a model?
(10 Points)
A. The model increases the complexity of the wave.
B. The model shows the wave more quickly.
C. The model can be measured much more accurately.
D. The model can be observed from the classroom more easily.
Answer:
D. The model can be observed from the classroom more easily
Explanation:
From the concept of using wire coil to model and the concept of using spring coil to measure, we can come to the conclusion that the correct answer is Option D.
1. How does the tendency of metal atoms to
lose valence electrons explain the periodic trends
of properties found in representative metal
elements
Explanation:
The tendency of metals to lose electrons is a measure of their electropositivity or metallicity.
Electropositivity is a measure of the tendency of atoms of an element to lose electrons. It is closely related to ionization energy and electronegativity of an element.
The lower the ionization energy of an element, the more electropositive or metallic an element is. Across a period, from left to right, electropositivity or metallicity decreases and from top to down a group, it increases. Metals are found on the left of the periodic table.I need help with science question. Picture attached
Answer:
C
cell wall only in plants
chloroplast only in plants
enlarged vacuoles only in plants
cell membrane in both
hope this helps :)
Explanation:
Answer:
a. cell wall b. membrane
Isopropyl alcohol (c3h7OH) burns in air according to this equation:
2C3H7OH + 9O2 -> 6CO2 + 8H2O
a) calculate the moles of oxygen needed to react with 3.40 mol C3H7OH
b) find the moles of each product formed when 3.40 mol C3H7OH reacts with oxygen
Answer:
a) 15.3 mol O₂
b) 10.2 mol CO₂; 13.6 mol H₂O
Explanation:
Step 1: Write the balanced equation
2 C₃H₇OH + 9 O₂ ⇒ 6 CO₂ + 8 H₂O
Step 2: Calculate the moles of O₂ that react with 3.40 moles of C₃H₇OH
The molar ratio of C₃H₇OH to O₂ is 2:9. The moles of O₂ required are 9/2 × 3.40 mol = 15.3 mol
Step 3: Calculate the moles of CO₂ produced from 3.40 moles of C₃H₇OH
The molar ratio of C₃H₇OH to CO₂ is 2:6. The moles of CO₂ produced are 6/2 × 3.40 mol = 10.2 mol
Step 4: Calculate the moles of H₂O produced from 3.40 moles of C₃H₇OH
The molar ratio of C₃H₇OH to H₂O is 2:8. The moles of H₂O produced are 8/2 × 3.40 mol = 13.6 mol
A diamond contains 5.0 x 10^(21) atoms of carbon. What amount (moles) of carbon and what mass (grams) of carbon are in this diamond
Answer:
Amount (Mole) of carbon = 0.008303 mole
Mass (gramm)of Carbon = 0.0997 g.
Explanation:
From Avogadro's law, we know that 1 mole of carbon contains 6.022×10²³ atoms.
Then the mole of carbon that contains 5.0×10²¹ atoms can be computed as (5.0×10²¹ / 6.022×10²³)
=0.008303 mole
5.0×10²¹ atoms is contained in 0.008303 mole
Hence, Amount (Mole) of carbon = 0.008303 mole
the mass of carbon can be computed , we know that
Mole = mass /Molar mass
Where Molar mass of carbon = 12.01 g/mol
n=0.008303 mol
Making " mass" subject of the formula,
mass=Mole ,× Molar mass
=0.008303 x 12.01
= 0.0997 g.
The formula mass of HC2H302 is
1.
59
2.
60
3.
72
4.
80
Answer:
60
Explanation:
The formula of the compound is given as:
HC₂H₃O₂
To find the formula mass we sum up the atomic masses of the component elements;
Atomic mass:
H = 1
C = 12
O = 16
HC₂H₃O₂ = 1 + 2(12) + 3(1) + 2(16)
= 1 + 24 + 3 + 32
= 60
Which of the following is true for the theoretical yield of a reaction? (1 point)
It is always calculated as a ratio.
It is the yield from the excess reactant.
It is the yield from the limiting reactant.
It is always twice the value of the actual yield.
Answer:
It is always twice the value of the actual yield.
Explanation:
what does dissocation of hydrogen mean ?
Answer:
dissociation, in chemistry, separation of a substance into atoms or ions. ... For example, hydrogen molecules (H2) dissociate into atoms (H) at very high temperatures; at 5,000°K about 95% of the molecules in a sample of hydrogen are dissociated into atoms.
Explanation:
What causes your vocal cords to vibrate a)mucas b)air c)chemicals
Answer:
air
Explanation:
Vocal folds vibrate when excited by aerodynamic phenomena; they are not plucked like a guitar string. Air pressure from the lungs controls the open phase. The passing air column creates a trailing “Bernoulli effect,” which controls the close phase.
PLEASE HELP ILL GIVE U BRAINLIEST
What's something you learned about the periodic table
Answer:
The periodic table of elements puts all the known elements into groups with similar properties. This makes it an important tool for chemists, nanotechnologists, and other scientists. If you get to understand the periodic table and learn to use it, you'll be able to predict how chemicals will behave.
Answer:
Okayy
Explanation:
The periodic table arranges the chemical elements
All the members of a family of elements have the same number of valence electrons and similar chemical properties. The horizontal rows on the periodic table are called periods
It have many properties. Each column is called a group.
ALSO Metals are placed on the left-hand side of the periodic table , and non-metals on the right.
Metalloids can also be called semimetals. On the periodic table, the elements colored yellow, which generally border the stair-step line, are considered to be metalloids.
i don’t understand this lolz help
Explanation:
In fluorine
protons = 9
Neutrons = 10
Electrons = 9
Hope it will help :)❤
Predict the Product
C6H12O6 → ______ + ___________
C6H12 + O2 → _______ + __________
Answer:
Answers with detail are given below.
Explanation:
C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂
Anaerobic respiration in plants produced ethanol which if accumulate then cause the harmful effect in plants. It is also occur in some microorganisms such as yeast.
C₆H₁₂O₆ → 2C₃H₆O₃
Anaerobic respiration in animals pyruvate converted into lactic acid and it is not as harmful as ethanol in plant if accumulate. It is produced during exercise. It can produce the cramps which can be cured with massage.
C₆H₁₂ + O₂ → CO₂ + H₂O
This reaction is the combustion reaction of cyclohexane. Cyclohexane burnt in the presence of oxygen and form water and carbon dioxide.
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What is the mass of 5.2 x 10^21 atoms of Vanadium?
Answer:
Mass = 0.44 g
Explanation:
Given data:
Mass of vanadium = ?
Number of atoms of vanadium = 5.2 × 10²¹ atoms
Solution:
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
5.2 × 10²¹ atoms × 1mol / 6.022 × 10²³ atoms
0.86× 10⁻² mol
0.0086 mol
Mass of vanadium:
Mass = number of moles × molar mass
Mass = 0.0086 mol × 50.9 g/mol
Mass = 0.44 g
Which of the following is the number of hydrogen atoms in a mole of hydrogen gas
at STP?
a) 224
b) 6,02 x 1023
c) 1,20 x 1024
d) 2.016
e) 1.008
When writing a chemical name, what is written first?
Write net ionic equations for the reaction that occurs when aqueous solutions of Lithium hydroxide, LiOH, with hydrobromic acid, HBr, undergo a neutralization reaction that produces salt and water.
Answer:
OH⁻(aq) + H⁺(aq) ⇒ H₂O(l)
Explanation:
Let's consider the molecular equation that occurs when aqueous solutions of lithium hydroxide and hydrobromic acid undergo a neutralization reaction.
LiOH(aq) + HBr(aq) ⇒ LiBr(aq) + H₂O(l)
The complete ionic equation includes all the ions and the molecular species.
Li⁺(aq) + OH⁻(aq) + H⁺(aq) + Br⁻(aq) ⇒ Li⁺(aq) + Br⁻(aq) + H₂O(l)
The net ionic equation includes only the ions that participate in the reaction and the molecular species.
OH⁻(aq) + H⁺(aq) ⇒ H₂O(l)
Considering this balanced chemical equation, how many grams of HgO will be produced when 44 g of Hg react with excess O2?
2Hg (l) + O2 (g) --> 2HgO (s)
A 28 g
B 44 g
C 48 g
D 96 g
Also, how would you go to solve this problem? Thanks!
Answer:
48g
Explanation:
2Hg(l) + O₂(g) => 2HgO
44g excess ?
44g/200.59g·mol⁻¹ = 0.219 mole Hg(l) = 0.219 mole HgO(s) produced.*
*Since coefficients are equal for Hg and HgO then the moles of HgO produced is the same as moles Hg used.
Convert 0.219 mole HgO to grams => 0.219mol x 216.95g/mol = 47.512g HgO ≅ 48g (2 sig figs)
To calculate the atoms of an element in a given molecule, we need to multiply stoichiometry by the number that is written on the foot of that element. The correct option is option C.
What is Balanced equation?Balanced equation is the one in which the total number of atoms of a species on reactant side is equal to the total number of atoms on product side. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, displacement reaction.
The other characteristic of balanced reaction is that physical state should be written with each compound or molecule on reactant and product side. Physical state should be written in brackets. s means solid, l means liquid, g means gas.
2Hg(l) + O₂(g) [tex]\rightarrow[/tex] 2HgO
44g excess ?
The mole ratio between Hg and HgO is 1:1.
44g÷200.59g/mol= 0.219 mole of Hg= 0.219 mole of HgO
mass of HgO=0.219mol x 216.95g/mol
= 47.512g
Therefore, the correct option is option C.
Learn more about the balanced equation, here:
https://brainly.com/question/7181548
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Lila is a track and field athlete. She must complete four laps around a circular track. The track itself measures 400 meters from start to finish and the race took her 6 minutes to complete.
Which best describes her speed and velocity?
Her speed is 4.4 m/s, and her velocity is 0 m/s.
Her speed is 1.1 m/s, and her velocity is 0 m/s.
Her speed is 0 m/s, and her velocity is 2400 m/s.
Her speed is 4.4 m/s, and her velocity is 4.4 m/s.
Answer:
Her speed is 1.1 m/s, and her velocity is 0 m/s.
Explanation:
Hello!
In this case, since the speed is the defined as the distance traveled over the elapsed time:
[tex]s=\frac{d}{t}[/tex]
And the velocity is defined as the change in displacement over the time interval:
[tex]v=\frac{\Delta d}{\Delta t}[/tex]
Thus, since the total distance traveled was 400 m and the total time 6 mins (360 s), we compute the speed as:
[tex]s=\frac{400m}{360s}=1.1m/s[/tex]
And the velocity is 0 m/s because the initial point is the very same final point as the track was circular. Therefore the answer is Her speed is 1.1 m/s, and her velocity is 0 m/s.
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A chemist adds 1.80L of a 1.1/molL aluminum chloride AlCl3 solution to a reaction flask. Calculate the millimoles of aluminum chloride the chemist has added to the flask. Round your answer to 2 significant digits.
Answer:
2000 millimoles of AlCl₃
Explanation:
From the question given above, the following data were obtained:
Volume of solution = 1.8 L
Molarity of solution = 1.1 mol /L
Millmole of AlCl₃ =?
Next, we shall determine the number of mole of AlCl₃ in the solution.
This can be obtained as follow:
Volume of solution = 1.8 L
Molarity of AlCl₃ solution = 1.1 mol /L
Number of mole of AlCl₃ =?
Molarity = mole /Volume
1.1 = Number of mole of AlCl₃ / 1.8
Cross multiply
Number of mole of AlCl₃ = 1.1 × 1.8
Number of mole of AlCl₃ = 1.98 moles
Finally, we shall convert 1.98 moles to millimoles. This can be obtained as follow:
1 mole = 1000 millimoles
Therefore,
1.98 mole = 1.98 mole × 1000 millimoles / 1 mole
1.98 mole = 1980 millimoles
1.98 mole ≈ 2000 millimoles
Thus, the chemist added 2000 millimoles of AlCl₃
How many calories of energy are required to heat an 87 g piece of iron from 30*C to 40*C?.
ses
(The is the specific heat of iron is 0.110 cal/g x *C)
Answer:
95.7 cal
Explanation:
The heat required can be calculated as follows:
heat = m x Cp x ΔT
Where:
m = mass of iron = 87 g
Cp = specific heat of iron = 0.110 cal/g.°C
ΔT = change in temperature = final T - initial T = 40°C - 30°C = 10°C
Thus, we introduce the data in the mathematical equation to calculate the heat in calories:
heat = 87 g x 0.110 cal/g.°C x 10°C = 95.7 cal
interconic attraction theory states what
Explanation:
Interionic Attractions are when an ion is surrounded by an ionic atmosphere which has a net charge opposite for its own. ... The ionic atmosphere cannot created nor destroyed. In solutions with weak electrolytes the number of ions is not large, therefore the effect of the interionic attraction is small.
Hope this is fine for youwhat is the emperical formula of a compound containing 40.1% carbon and 6.6% hydrogen
Answer:
CH₂
Explanation:
Given parameters:
Percentage composition:
Carbon = 40.1%
Hydrogen = 6.6%
Unknown:
Empirical formula of the compound = ?
Solution:
The empirical formula of a substance is its simplest formula.
Elements Carbon Hydrogen
Percentage
Composition 40.1 6.6
Molecular mass 12 1
Number of moles 40.1/12 6.6/1
3.342 6.6
Divide through by
the smallest 3.342/3.342 6.6/3.342
1 2
So the empirical formula of the compound is CH₂
sasha from aot died :(
Answer:
yeesss. I am sooooo ssaaaddddd
Answer:
Yes and her last word was meat
Explanation:
Sasha supremacy
Do you think more chemical reactions that occur in the human body are endothermic or exothermic? Justify your answer.
Answer:
Exothermic
Explanation:
We as humans do not absorb heat. A good way to think about it is that when we workout we use energy from our body which causes our body temperature to rise. The energy used from food maintains our blood, respiration, and other systems in optimal condition. This requires energy from our body which ends up leaving the body as heat.
10.
(05.05 MC)
Read the chemical equation.
Fe2O3 + CO → Fe + CO2
If 1.8 moles of Fe2O3 react with 2.7 moles of CO, how many moles of each product are formed? (3 points)
5.4 moles Fe and 1.8 moles CO2
2.7 moles Fe and 0.9 moles CO2
3.6 moles Fe and 5.4 moles CO2
1.8 moles Fe and 2.7 moles CO2
Answer: 1.8 moles Fe and 2.7 moles [tex]CO_2[/tex] are produced.
Explanation:
The balanced chemical reaction is:
[tex]Fe_2O_3+3CO\rightarrow 2Fe+3CO_2[/tex]
According to stoichiometry :
3 moles of [tex]CO[/tex] require 1 mole of [tex]Fe_2O_3[/tex]
Thus 2.7 moles of [tex]CO[/tex] will require=[tex]\frac{1}{3}\times 2.7=0.9moles[/tex] of [tex]Fe_2O_3[/tex]
Thus [tex]CO[/tex] is the limiting reagent as it limits the formation of product and [tex]Fe_2O_3[/tex] is the excess reagent.
As 3 moles of [tex]CO[/tex] give = 2 moles of [tex]Fe[/tex] and 3 moles of [tex]CO_2[/tex]
Thus 2.7 moles of [tex]CO[/tex] will give =[tex]\frac{2}{3}\times 2.7=1.8moles[/tex] of [tex]Fe[/tex] and [tex]\frac{3}{3}\times 2.7=2.7moles[/tex] of [tex]CO_2[/tex]
Thus 1.8 moles Fe and 2.7 moles [tex]CO_2[/tex] are produced.