Answer:
Explanation:
pH = 4.08
[ H⁺ ] = 10⁻⁴°⁰⁸
= 8.3 x 10⁻⁵
concentration of acid = .3250 M
HA ⇆ H⁺ + A⁻
.325 8.3 x 10⁻⁵ 8.3 x 10⁻⁵
Ka = (8.3 x 10⁻⁵ )² / .325
= 68.9 x 10⁻¹⁰ / .325
= 212 x 10⁻¹⁰ M .
pKa = - log ( 212 x 10⁻¹⁰ )
= 10 - log 212
= 10 - 2.32
= 7.68 .
What is the molecular formula of each of the following compounds? Part A Empirical formula CHO2, molar mass = 180.0 g/mol
Answer:
C4H4O8
Explanation:
The molecular formula of a compound with empirical formula: CHO2 can be calculated as follows:
(CHO2)n = 180g/mol
{12 + 1 + 16(2)}n = 180
(12+1+32)n = 180
(45)n = 180
n = 180/45
n = 4.
The molecular formula = (CHO2)4
= C4H4O8
If you help me i will give bra1niest. Guaranteed
Answer:lll
I looked and lll is the only one that wont make since so it’s lll
How much heat is required to change 150.0 g of water from 21.0 °C to 45.0°C
Answer:
When it asks how much heat it is required to change the temperature then it is called specific heat capacity, and when it says how much heat required TO CHANGE THE STATE then it is latent heat so here we will do by formula of
Q = mcT
where q is heat
m is mass
T is change in temperature which is going to be 24 here
put all the values you will get the answer
HOPE IT HELPS!
Write chemical equations and corresponding equilibrium expressions for each of the two ionization steps of carbonic acid.
Answer:
H₂CO₃(aq) ⇄ H⁺(aq) + HCO₃⁻(aq) K₁ = [H⁺][HCO₃⁻]/[H₂CO₃]
HCO₃⁻(aq) ⇄ H⁺(aq) + CO₃²⁻(aq) K₂ = [H⁺][CO₃²⁻]/[HCO₃⁻]
Explanation:
Let's consider the equation for the first step of the ionization of carbonic acid.
H₂CO₃(aq) ⇄ H⁺(aq) + HCO₃⁻(aq)
The first ionization constant is:
K₁ = [H⁺][HCO₃⁻]/[H₂CO₃]
Let's consider the equation for the second step of the ionization of carbonic acid.
HCO₃⁻(aq) ⇄ H⁺(aq) + CO₃²⁻(aq)
The second ionization constant is:
K₂ = [H⁺][CO₃²⁻]/[HCO₃⁻]
A friend uses an analogy of raisins in rising bread dough to describe galaxies in the expanding universe. Is your friend’s analogy strong? Explain.
Which energy transition may take place in the atom if it’s electron has absorbed a photon?
Answer:
higher-energy orbit
20 POINTSSSS!!!!!!!!!!!
WHAT IS THE COLORS NOT THE GASES THE COLORS OF AN PLASMA BALL?
blue, red, and white colors.
Explanation:
→Blue→Red →WhiteYour AnswerHow much aluminum can be produced from 5.00 ton of Al2O3?
Answer:
Almost to exactly .5 tons
Explanation:
5 tons of Aluminum oxide will produce, 2.64 tons of Aluminum.
In a mole of aluminum oxide, the total extraction will yield 2 atoms of aluminum.
Thus, 102 grams (1 mole) of aluminum oxide will give 54 grams of aluminum.
In terms of kg:
0.102 kg aluminum oxide = 0.054 kg Aluminum
5 tons aluminum oxide = 4535.92 kg of aluminum oxide
Since, 0.102 kg aluminum oxide = 0.054 kg aluminum
4535.92 kg of aluminum oxide = [tex]\rm \dfrac{0.054}{0.102}\;\times\;4535.92[/tex] kg of aluminum
4535.92 kg of aluminum oxide = 2401.37 kg of Aluminum
2401.37 kg Aluminum = 2.64 ton of Aluminum.
Thus, 5 tons of Aluminum oxide will produce, 2.64 tons of Aluminum.
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A photon of red light has wavelength 750 nm, a photon of
green light has wavelength 615 nm and a photon of violet light
has wavelength 420 nm. Which of the following radiations
has/have higher frequency?
Answer:
violet light
Explanation: ck12 says so
What is the heat of a reaction, in kJ/mol, with a total reaction mixture mass of 62.6 g if the reaction of 0.15 mol of reactant A causes a temperature increase of 4.6 oC in a calorimeter
Answer:
[tex]-8.032\ \text{kJ/mol}[/tex]
Explanation:
m = Mass of mixture = 62.6 g
n = Number of mole of reactant = 0.15 mol
[tex]\Delta T[/tex] = Change in temperature = [tex]4.6^{\circ}\text{C}[/tex]
c = Specific heat of mixture = [tex]4.184\ \text{J/g}^{\circ}\text{C}[/tex] (assumed to be the same as water)
Heat generated
[tex]Q=mc\Delta T\\\Rightarrow Q=62.6\times 4.184\times 4.6\\\Rightarrow Q=1204.82\ \text{J}=1.20482\ \text{kJ}[/tex]
Heat of reaction is given by
[tex]\Delta H=-\dfrac{Q}{n}\\\Rightarrow \Delta H=-\dfrac{1.20482}{0.15}\\\Rightarrow \Delta H=-8.032\ \text{kJ/mol}[/tex]
The heat of the reaction is [tex]-8.032\ \text{kJ/mol}[/tex]
A 62.6 g-reaction mixture that contains 0.15 moles of reactant A and causes a temperature increase of 4.6 °C in a calorimeter, has a heat of reaction of -8.0 kJ/mol.
We have a reaction mixture in a calorimeter that causes a temperature increase of 4.6 °C (ΔT). We can calculate the heat absorbed by the solution (Qs) using the following expression.
[tex]Qs = c \times m \times \Delta T = \frac{4.184J}{g.\° C} \times 62.6 g \times 4.6 \° C \times \frac{1kJ}{1000J} = 1.2 kJ[/tex]
where,
c: specific heat capacity of the solution (we will assume it is the same as water)m: mass of the solutionAccording to the law of conservation of energy, the sum of the heat absorbed by the solution and the heat released by the reaction (Qr) is zero.
[tex]Qs + Qr = 0\\\\Qr = -Qs = -1.2 kJ[/tex]
1.2 kJ are released by the reaction of 0.15 moles of reactant A. The heat of the reaction, in kJ/mol, is:
[tex]\frac{-1.2kJ}{0.15mol} = -8.0 kJ/mol[/tex]
A 62.6 g-reaction mixture that contains 0.15 moles of reactant A and causes a temperature increase of 4.6 °C in a calorimeter, has a heat of reaction of -8.0 kJ/mol.
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The second-order reaction CH3CHO→CH4+CO has the reaction constant k of 6.73×10−5 L/mol s. If the initial concentration of CH3CHO is 0.551 mol/L, what is the concentration of CH3CHO after 45.0 seconds? Your answer should have 3 significant figures (three decimal places).
Answer:
[tex][CH_3CHO]=0.550M[/tex]
Explanation:
Hello.
In this case, since the rate law for this chemical reaction would be:
[tex]r=\frac{d[CH_3CHO]}{dt} =-k[CH_3CHO]^2[/tex]
The integrated rate law after its demonstration is:
[tex]\frac{1}{[CH_3CHO]} =kt+\frac{1}{[CH_3CHO]_0}[/tex]
Thus, for the given rate constant, initial concentration of CH3CHO and elapsed time, the resulting concentration is:
[tex]\frac{1}{[CH_3CHO]} =6.73x10^{-5}\frac{L}{mol*s}*45.0s +\frac{1}{0.551mol/L}\\\\\frac{1}{[CH_3CHO]}=3.03x10^{-3}L/mol+1.81L/mol[/tex]
[tex]\frac{1}{[CH_3CHO]} =1.82L/mol[/tex]
[tex][CH_3CHO]=0.550M[/tex]
Best regards!
The initial concentration of A in the first order reaction A→3B+2C is 0.535 mol L−1. Given that the rate constant is 0.450 s−1, what is the half-life of the reaction, in seconds? Remember to use correct significant figures in your answer (round your answer to the nearest hundredth).
Answer:
Half life = 1.540 s
Explanation:
A → 3B+2C
Initial concentration = 0.535 mol L−1
rate constant k = 0.450 s-1
half life t1/2 = ?
Since the reaction s a first order reaction
Half life is given by;
t1/2 = 0.693 / k
t1/2 = 0.693 / 0.450 = 1.540 s
What happens when a high pressure system goes towards a low pressure system?
why boiling points are much More extreme that melting points?
Answer:
Every substance has its own melting point and boiling point . The stronger the forces between particles, the higher its melting and boiling points. For example, the forces between ions in an ionic solid are stronger than those between molecules in water or hydrogen.
Explanation:
Answer:
They are extremely hotter and the molten lava is being boiled by the earth.
Explanation:
By: Dreamy Illumination
HELP ASAP PLEASE :)))
All of the following are examples of physical properties EXCEPT?
A. melting point
B. hardness
C.ability to burn
D. density
Answer:
Ability to burn
Explanation:
If you burn something, lemme tell ya, it ain't coming back.
The physical properties are properties where chemical composition is not altered thus, the correct option is C that is ability to burn as burning changes chemical composition.
Any property which describes the state of a physical system is called as a physical property.Changes in physical properties are used to describe changes between the states. They are often related to as observable properties.
Physical property which can be quantified is a physical quantity. These are also classified further with respect to their directionality. Isotropic properties do not change with direction of observation while anisotropic properties change with direction of observation.
Physical properties are differentiated from chemical properties by the way they determine how a substance behaves in a chemical reaction.
In burning the chemical composition is changed thus it is not a physical property.Thus, correct option is C.
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How are homogeneous and
heterogeneous mixtures alike and
different?
Answer: A homogeneous mixture has the same uniform appearance and composition throughout. Many homogeneous mixtures are commonly referred to as solutions. A heterogeneous mixture consists of visibly different substances or phases. ... Solutions have particles which are the size of atoms or molecules - too small to be seen.
Which of the following is NOT a property of all metals?
a. conduct electricity b. shiny
c. does not conduct heat d. malleable when solid
Answer: Shiny
Explanation:
The atoms of which element will gain electrons to form an ion?
A. mercury
B. bromine
C. beryllium
D. potassium
Jill has decided that she wants to start conserving gasoline Jill is considered about the rising price of gas as well as by products from gas engines pollute the atmosphere what solution would help Jill solve this problem
A). deciding to drive her Carla until the price goes down
B). Deciding to ride her bicycle from work Instead of driving
C). Deciding to use premium unleaded instead of regular unleaded gasoline
D) Deciding to move to a city where smog from automobiles is not a problem
Answer:B
Explanation:
It is
According to law of conservation of energy and usage of renewable resources Jill should decide to ride her bicycle from work instead of driving.
What is law of conservation of energy?According to the law of conservation of energy, it is evident that energy is neither created nor destroyed rather it is restored at the end of a chemical reaction .
Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.
Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Julius Robert Mayer in the year 1842.
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An atom of tin becomes an cation when it forms an ionic bond with four atoms of chlorine. What is the charge
on the tin ion?
4-
4+
2-
2+
Explanation:
as it is cation so 4+
it loses four electron
The temperatures on the inside and outside surface of a wall are 20°C and 5°C respectively. The wall is 8 m wide, 4 m high, and 0.2 m thick.
The thermal conductivity is 0.3 W/m.K.
1
The heat flux through the wall is negative
W/m2. Use two significant figures in your answer.
Answer:
Heat Flux = - 22.5 W/m²
Explanation:
We can use Fourier's Law of Heat Conduction:
q = -kAΔT/t
q/A = -KΔT/t
where,
q/A = Heat Flux = ?
K = Thermal Conductivity = 0.3 W/m.K
ΔT = Change in Temperature = 20°C - 5°C = 15K
t = Thickness = 0.2 m
Therefore,
Heat Flux = -(0.3 W/m.k)(15 k)/(0.2 m)
Heat Flux = - 22.5 W/m²
Negative sign shows the heat flowing out of the system.
How does rust form?
a. Through paint flaking off of a metal surface
b. Through a chemical reaction between iron and oxygen c. Through weathering
d. Through the physical mixing of iron and wa
Answer:
B. Through a chemical reaction between iron and oxygen
1. Where is the Cascade Range found? 2. What does the Cascade Range include?
3. What formed the Cascade mountains?
4. What is a plate boundary?
5. List the three ways plates interact.
6. What is subduction?
7. What is the Ring of Fire?
8. What do colliding plates form?
1. Cascade Range, segment of the Pacific mountain system of western North America. The Cascades extend northward for more than 700 miles (1,100 km) from Lassen Peak, in northern California, U.S., through Oregon and Washington to the Fraser River in southern British Columbia, Canada.
2.The Cascade Range or Cascades is a major mountain range of western North America, extending from southern British Columbia through Washington and Oregon to Northern California. It includes both non-volcanic mountains, such as the North Cascades, and the notable volcanoes known as the High Cascades.
3.The Cascade Volcanoes were formed by the subduction of the Juan de Fuca, Explorer and the Gorda Plate (remnants of the much larger Farallon Plate) under the North American Plate along the Cascadia subduction zone.
4.What are Plate Boundaries? Plate boundaries are the edges where two plates meet. Most geologic activities, including volcanoes, earthquakes, and mountain building, take place at plate boundaries.
5.Contents
1 Divergent boundaries.
2 Convergent boundaries (subduction zone)
3 Orogenic belts.
4 Transform boundaries.
____________________
6.Subduction is a geological process that takes place at convergent boundaries of tectonic plates where one plate moves under another and is forced to sink due to high gravitational potential energy into the mantle. ... Subduction zones are sites that usually have a high rate of volcanism and earthquakes.
7.The Ring of Fire is a major area in the basin of the Pacific Ocean where many earthquakes and volcanic eruptions occur.
8.The impact of the colliding plates can cause the edges of one or both plates to buckle up into a mountain ranges or one of the plates may bend down into a deep seafloor trench. A chain of volcanoes often forms parallel to convergent plate boundaries and powerful earthquakes are common along these boundaries.
Group 17 elements form A. +1 ion B. -1 ion C. +7 ion D. -7 ion
Answer:
B
Explanation:
Use your periodic table to find out the charge on a Fl ion if your periodic table is constructed that way. In any event, the charge on Fl when it becomes an ion is -1. I don't think it has any other charge. So all of the elements in column 17 will have at least -1 in common.
If an atom has a neutral charge, it must have *
A. More Neutrons than protons
B. More protons than neutrons
C. Same number of electrons and protons
D. Same number of electrons and neutrons
Answer:
C
Explanation:
helpp pls anything helpsss
Answer:go in the order from top to bottom.
Ammonium chloride= NH2Cl
chlorideIron(III) nitrate=Fe(NO3)3
Titanium(III) bromide=TiBr3
Copper(I) phosphide=Cu3P
Tin(IV) Selenide=SnSe2
Gallium arsenide=GaAs
Lead(II) sulfate=Pb(SO4)3
Beryllium Hydrogen Carbonate=Be(HCO3)2
Manganese(III) Sulfite=Mn2(SO3)3
Aluminium cyanide Al(CN)3.
What is A Chemical Bond- ASAP!
Answer:
B.
Explanation:
A chemical bond holds together attractions of atoms
A chemist determines by measurements that 0.030 moles of hydrogen gas participate in a chemical reaction. Calculate the mass of hydrogen gas that participates. Be sure your answer has the correct number of significant digits.
Answer:
0.060 g
Explanation:
Hydrogen gas is made up of 2 atoms of hydrogen [tex]H_2(g)[/tex].
From the formula for calculating mole:
mole = mass/molar mass
Molar mass of hydrogen gas = 2.016 g/mol
Hence, 0.030 mole hydrogen gas would weigh:
mass = molar mass x mole
= 2.016 x 0.030
= 0.06048 g
The mass of hydrogen gas that participated to the correct number of significant digits is, therefore, 0.060 g
what is the litosphere made of
Answer:
brittle crust and top is made of upper mantel
I need help with the second one
Sorry, your photo isn't clear enough.
