Answers:
1) Photons are absorbed by hot gas atoms.
2) Energy is transferred through large-scale movement of material.
3) Energy is released into the photosphere.
The Sun interior is divided into three regions: the inner core, the radiative zone and the convection zone.
The inner core is the central region of the Sun and all solar energy is produced in the core by nuclear fusion.
Radiative zone is around the inner core and in this area energy is transported by radiation.
The convection zone is the outer-most layer of the interior and in this area energy is transported by convection.
A radioactive isotope has a half-life of 9 hours. find the amount of the isotope left from a 360-milligram sample after 36 hours. if necessary, round your answer to the nearest thousandth.
Answer:
22.5 mg
Explanation:
36 hrs / 9 hr/half life = 4 half lives
(1/2)^4 * 360 = 22.5 mg
What is the speed of a wave with a frequency of 2 Hz and a wavelength of 87 m? 0. 023 m/s 43. 5 m/s 89 m/s 174 m/s.
Answer:174 m/s
Explanation:
I took the test and got 100%
Which animal is in higher trophic level dolphins or plankton
?? Answeeeeeeer
Answerrrrrrrrr
Answer:
.00000005 C or 50 x 10^-9 C
Explanation:
Like charges REPEL
k = 8.99 x 10^9 kg m^3 / s^2 C^2 ( they should have given units of this)
F = k q1q2/r^2 q1 = q2 so
F = k q^2 / r^2
9 x 10^-3 = 8.99 x 10^9 * q^2 /.05^2 (.05 m = 5cm)
q = .00000005 C
If you added a big pile of rocks into the boat so that the mass of the rocks was greater than the displaced water, what would happen to the ship?
Answer:
it would sink to the bottom of the ocean and break in half
Explanation:
Explanation:
so if the ship was on displaced water then the ship would sink to the bottom of the ocean
you are working as an analytical ghemist at a university. an archeologist is studying a village
dating to 800 to 1000 years ago brings you a sample of charcoal from a dig site 300 meters from
the main village site. the archeologist asks you to analyze the sample to see if it could be from a
new part of the village or was it naturally occurring. what is the scientific question the
archeologist is asking of you?
The scientific question that is being asked by the archeologist is the age of the sample.
What is a scientific question?A scientific question is a question that can be answered empirically. That is, the question can be answered through an experiment.
Given the explanation in the question, the scientific question that is being asked by the archeologist is the age of the sample.
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An owl eats its pray whole or in large pieces summarize what is found in an owl pellet and why it is regurgitated
Answer:
it is regurgitated and an owl pellet
give maximum 3 examples each for exothermic and endothermic reaction.
like :- N2+O2---->2NO
Explanation:
Exothermic reactions are those reactions in which heat is released.
Reactants→products+heat
For example, formation of ammonia from nitrogen and hydrogen is an exothermic reaction.
N2(g)+3H2(g)→2NH3(g)+92.2kJ
Endothermic reactions are those reactions in which heat is absorbed.
Reactants+heat→products
For example, dissociation of ammonia into nitrogen and hydrogen is an endothermic reaction.
2NH3 (g)+92.2kJ→
N2(g)+3H2(g)
can someone please help meeeee (im doing map)
Hydrazine is a colourless fuming corrosive strongly reducing liquid base [tex]N_2H_4[/tex] used especially in fuels for rocket and jet engines. And [tex]2H_2[/tex](g) is used to prepare hydrazine. Hence, option B is correct.
[tex]N_2(g)+2H_2(g)[/tex] → [tex]N_2H_4(g)[/tex]
What is hydrazine?Hydrazine is a chemical compound with the formula [tex]N_2H_4[/tex]. It has an ammonia-like odour, but the properties are more similar to water.
Chemical equation of the formation of hydrazine:
[tex]N_2(g)+2H_2(g)[/tex] → [tex]N_2H_4(g)[/tex]
Hence, option B is correct.
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There is no such thing as a(n) ___ gas.
Answer:
Ideal?
Explanation:
This question is lacking context, but it's most likely looking for ideal. There is an idea of "ideal" gasses, which are gasses the behave according the ideal gas law PV=nRT. The concept is the gasses can get very close to behaving ideally, but there is never a gas the will perfectly obey the ideal gas law. There are many factors that affect this, but I won't get into thoes since that's not what the question asked.
preform the following mathematical operation, and report the answer to the correct number of significant figures
1.235 x 2.65 = ?
As lowest significant is 2.65
It should be rounded till second decimal
3.2733.27Water is a pure substance. Which of the following iS true about water?
O Its
compounds can only be chemically separated into the elements that make it up.
Its
compounds can only be physically separated into the elements that make it up.
® It is made up of a variety of compounds, each with a different set of properties.
® It is made up of one element and one compound, each with the
same properties.
Answer:
Explanation:
a.) Its compounds can only be chemically separated into the elements that make it up.
Water's compounds can only be chemically separated into the elements that make it up. The elements that make up water are two hyrdogen atoms and one oxygen. They only way to break down water is to return to the original three atoms.
I HOPE THIS HELPS & good luck <3 !!!!
How many moles of gas are there in a 50. 0 l container at 22. 0 °c and 825 torr?
2.2311 moles of gas are there in a 50. 0 l container at 22. 0 °c and 825 torrs.
What is an ideal gas?An Ideal gas is a hypothetical gas whose molecules occupy negligible space and have no interactions, and which consequently obeys the gas laws exactly.
Assuming the gas is ideal, we can solve this problem by using the following equation:
PV = nRT
Where:
P = 825 torr ⇒ 825 / 760 = 1.08 atm
V = 50 L
n = ?
R = 0.082 atm·L·mol⁻¹·K⁻¹
T = 22 °C ⇒ 22 + 273.16 = 295.16 K
We input the data:
1.08 atm x 50 L = n x 0.082 atm·L·mol⁻¹·K⁻¹ x 295.16 K
And solve for n:
24.20312
n = 2.2311 mol
Hence, 2.2311 moles of gas are there in a 50. 0 L container at 22. 0 °c and 825 torrs.
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what are chemical changes in chemistry
a usually irreversible chemical reaction involving the rearrangement of the atoms of one or more substances and a change in their chemical properties or composition, resulting in the formation of at least one new substance: The formation of rust on iron is a chemical change. Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.
Use the drop-down menus to answer the questions. Which type of radioactive decay produces particles with a positive charge and very small mass? Which type of radioactive decay produces radiation with zero mass? Which type of radioactive decay produces radiation that requires lead shielding? Which type of radioactive decay produces radiation that can be stopped by a sheet of paper? Which type of radioactive decay produces particles with the most mass?.
Answer:
beta, gamma. gamma. alpha, alpha
Explanation:
Answer:
1. Beta
2. Gamma
3. Gamma
4. Alpha
5. Alpha
Explanation:
A solution containing HCl would likely have a high pH and a low pOH. A low pH and a high pOH. A high pH and a high pOH. A low pH and a low pOH.
[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
Since we already know that HCl is an acid and acids have low pH values, it must have pH less than 7, so we can conclude that it has A low pH and A high pOH value.
So, the solution containing HCl must be the same.
That is :
A low pH and a high pOH
Answer:
B
Explanation:
Calculate the mass of Sb produced when 0.122 moles of is produced. Show work.
Answer:
14.9 g Sb
Explanation:
The mass of Sb produced can be calculated using the conversion:
Molar Mass (g/mol) = mass (g) / moles
Antimony (Sb) has the molar mass 121.76 g/mol. This value is found on the periodic table. You have been given the moles produced. Therefore, you can find the mass of Sb by plugging these values into the formula and simplifying.
Molar Mass = mass / moles
121.76 g/mol = mass / 0.122 moles
14.9 = mass
Find the percent yield of both experiments 1.magnesium
2.copper carbonate
The the percent yield of the given reactions is the ratio of the actual yield and the theoretical yield expressed as a percentage.
What is percent yield of a reaction?The percent yield of a reaction is the ratio the actual yield and the theoretical yield of a reaction expressed as a percentage.
Percent yield = actual yield/theoretical yield × 100%The actual yield is obtained from the experiment while the theoretical yield is obtained from the equation of the reaction.
The percent yield of a reaction gives an indication of how efficient the reaction conditions were.
The equation of the reaction in the given question is not stated.
Therefore, the percent yield of the given reactions is the ratio of the actual yield and the theoretical yield expressed as a percentage.
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PLEASE ANSWER THIS ASAP!!!!!!:Was the erosion in this image a result of physical or chemical weathering?
Answer:
physical
Explanation:
the snow caused the erosion.
Answer:
physical
Explanation:
A saturated solution of Al(OH)3 has a molar solubility of2.9x J0-9 Mat a certain temperature. What is the solubility product constant, Ksp, of Al(OH)3 at this temperature
The solubility product constant, Ksp, of the aluminum hydroxide, Al(OH)₃ at the temperature is 1.91×10¯³⁹
What is solubility of product?The solubility of product (Ksp) is defined as the concentration of products raised to their coefficient coefficients. This is illustrated below:
mA <=> nC + eD
Ksp = [C]^n × [D]^e
With the above information in mind, we can obtain the solubility of the product. This is illustrated below:
Dissociation equationAl(OH)₃(aq) → Al³⁺(aq) + 3OH¯(aq)
From the balanced equation above,
1 mole of Al(OH)₃ contains 1 mole of Al³⁺ and 3 moles of OH¯
How to determine the concentration of Al³⁺ and OH¯From the balanced equation above,
1 mole of Al(OH)₃ contains 1 mole of Al³⁺ and 3 moles of OH¯
Therefore,
2.9×10¯⁹ M Al(OH)₃ will also contain
1 × 2.9×10¯⁹ = 2.9×10¯⁹ M Al³⁺3 × 2.9×10¯⁹ = 8.7×10¯⁹ M OH¯How to determine the solubility of productConcentration of Al³⁺ = 2.9×10¯⁹ M
Concentration of OH¯ = 8.7×10¯⁹ M
Solubility product (Ksp) =?
Al(OH)₃(aq) → Al³⁺(aq) + 3OH¯(aq)
Ksp = [Al³⁺] × [OH¯]³
Ksp = 2.9×10¯⁹ × (8.7×10¯⁹)³
Ksp = 1.91×10¯³⁹
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CH3COOH CH3COO– + H+
You start with 0.05 moles of acetic acid in 500 mL of water. At equilibrium, the pH of the solution is 2.873. What is the equilibrium constant of this reaction? Hint: You will need to calculate an antilog using a scientific calculator.
(a)
pH = 4.77
; (b)
[
H
3
O
+
]
=
1.00
×
10
-4
l
mol/dm
3
; (c)
[
A
-
]
=
0.16 mol⋅dm
-3
Explanation:
(a) pH of aspirin solution
Let's write the chemical equation as
m
m
m
m
m
m
m
m
l
HA
m
+
m
H
2
O
⇌
H
3
O
+
m
+
m
l
A
-
I/mol⋅dm
-3
:
m
m
0.05
m
m
m
m
m
m
m
m
l
0
m
m
m
m
m
l
l
0
C/mol⋅dm
-3
:
m
m
l
-
x
m
m
m
m
m
m
m
m
+
x
m
l
m
m
m
l
+
x
E/mol⋅dm
-3
:
m
0.05 -
l
x
m
m
m
m
m
m
m
l
x
m
m
x
m
m
m
x
K
a
=
[
H
3
O
+
]
[
A
-
]
[
HA
]
=
x
2
0.05 -
l
x
=
3.27
×
10
-4
Check for negligibility
0.05
3.27
×
10
-4
=
153
<
400
∴
x
is not less than 5 % of the initial concentration of
[
HA
]
.
We cannot ignore it in comparison with 0.05, so we must solve a quadratic.
Then
x
2
0.05
−
x
=
3.27
×
10
-4
x
2
=
3.27
×
10
-4
(
0.05
−
x
)
=
1.635
×
10
-5
−
3.27
×
10
-4
x
x
2
+
3.27
×
10
-4
x
−
1.635
×
10
-5
=
0
x
=
1.68
×
10
-5
[
H
3
O
+
]
=
x
l
mol/L
=
1.68
×
10
-5
l
mol/L
pH
=
-log
[
H
3
O
+
]
=
-log
(
1.68
×
10
-5
)
=
4.77
(b)
[
H
3
O
+
]
at pH 4
[
H
3
O
+
]
=
10
-pH
l
mol/L
=
1.00
×
10
-4
l
mol/L
(c) Concentration of
A
-
in the buffer
We can now use the Henderson-Hasselbalch equation to calculate the
[
A
-
]
.
pH
=
p
K
a
+
log
(
[
A
-
]
[
HA
]
)
4.00
=
−
log
(
3.27
×
10
-4
)
+
log
(
[
A
-
]
0.05
)
=
3.49
+
log
(
[
A
-
]
0.05
)
log
(
[
A
-
]
0.05
)
=
4.00 - 3.49
=
0.51
[
A
-
]
0.05
=
10
0.51
=
3.24
[
A
-
]
=
0.05
×
3.24
=
0.16
The concentration of
A
-
in the buffer is 0.16 mol/L.
hope this helps :)
The equilibrium constant of this reaction is 1.80×10-5
Given data,
pH of solution = 2.873
Number of moles of acetic acid (m) = 0.05 moles
Volume of water (V) = 500 mL = 0.5L
So, concentration (C) = m/V in lit = 0.05/0.5 = 0.1 M
Equilibrium constant ( K ) = [tex][CH_{3} COO-][/tex]×[tex][H+_{} ][/tex]/[tex][CH_{3} COOH][/tex]
Since, acetic acid is weak acid,
So, Equilibrium constant ( K ) = [tex][H+]^{2}[/tex]/[tex][CH_{3} COOH][/tex] ....(i)
As the pH = 2.873, the [tex][H+_{} ][/tex] is antilog of -2.873 or 1.34×10-3 M.
Putting the value of concentration of [tex]H+_{}[/tex] and [tex]acetic_{} acid[/tex] in equation (i).
Equilibrium constant ( K ) = 1.80×10-5
What is weak acid ?The acid which is partially dissociates into ions on dissolving in aqueous solution is called weak acid.
Example: [tex]acetic_{} acid[/tex].
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72.
How many atoms are present in one mole of
water?
A)54
B)3
C)3(6.02 × 1023)
D)6.02 x 1023
Answer:
3 atoms
Explanation:
A water molecule consists of three atoms an oxygen atom and two hydrogen atoms which are bond together like little magnets
If enough of a monoprotic acid is dissolved in water to produce a 0. 0186 m solution with a ph of 6. 44 , what is the equilibrium constant, ka, for the acid?
The equilibrium constant, ka, for the monoprotic acid is 7.08 × 10⁻¹⁶.
How do we calculate Ka?
Acid dissociation constant (Ka) for monoprotic acid will be calculated according to the given equation:
Ka = [H₃O⁺][A⁻] / [HA]
Relation between H₃O⁺ and pH will be represented as:
[H₃O⁺] = [tex]10^{-pH}[/tex]
pH = 6.44 (given)
[H₃O⁺] = [tex]10^{-6.44}[/tex] = 3.63×10⁻⁷
Given chemical reaction with ICE table is:
HA(aq) + H₂O(l) ⇄ H₃O⁺(aq) + A⁻
Initial: 0.0186 0 0
Change: -3.63×10⁻⁷ 3.63×10⁻⁷ 3.63×10⁻⁷
Equilibrium: 0.0186-3.63×10⁻⁷ 3.63×10⁻⁷ 3.63×10⁻⁷
Now Ka for this will be:
Ka = (3.63×10⁻⁷)² / (0.0186-3.63×10⁻⁷)
Value of 3.63×10⁻⁷ is negligible as compared to the 0.0186 value and equation becomes,
Ka = (3.63×10⁻⁷)² / 0.0186 = 13.18 × 10⁻¹⁴ / 0.0186
Ka = 7.08 × 10⁻¹⁶
Hence value of equilibrium constant is 7.08 × 10⁻¹⁶.
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Which element is reduced in this reaction? 2kmno4 3na2so3 h2o→2mno2 3na2so4 2koh
In a redox chemical reaction, one species gets reduced and another gets oxidized. Manganese element is reduced in this reaction.
What is oxidized and reduced?In a redox reaction, the increase or decrease in the oxidation number and electrons results in the reduction and oxidation of the chemical species. The oxidation and reduction occur simultaneously in a reaction.
The oxidation number of Mn in permanganate ion was +8 on the left side and decreased to +4 on the right side of the equation. Potassium permanganate is an oxidizing agent that has reduced the manganese ion of the permanganate ion.
Therefore, manganese is reduced.
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I need help with these questions
The definition of astronomic bodies are indicated below with the sentences defining them.
What are astronomic bodies?Astronomic bodies are celestial objects that occur naturally in space.
Here are their definitions below:
a. Supernova exhibits strong gravitational pull such that no light can escape
b. A nebula a large cloud of gas or dust in space.
c. A white dwarf is what a medium-mass star becomes at the end of it's life.
d. Protostar is the earliest stage of a star's life.
e. Black dwarf is a star left at the core of a planetary nebula.
f. Neutron stars are the remains of a high mass star.
g. A supernova is what occurs when a red supergiant star explodes.
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0. 300 moles of sodium nitrite are needed for a reaction
Molar concentration is the ratio of the moles and the volume. The volume of the solution that is needed is
What is Molarity?Molarity or the molar concentration is the proportion of the moles of the solute to the volume of the solution in liters.
Given,
The molar concentration of the solution = 0.450 mol/L
Moles of sodium nitrite = 0.300 moles
Volume is calculated as:
[tex]\begin{aligned} \rm volume &= \rm \dfrac{moles}{molarity}\\\\&= \dfrac{0.300}{0.450}\\\\&= 0.666 \;\rm L\end{aligned}[/tex]
Therefore, 666 mL of volume is needed.
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Explain why hydrogen chloride is a gas at room temperature
The hydrogen chloride is a gas at room temperature due to the presence of weak intermolecular forces.
What is hydrogen chloride?Hydrogen chloride (HCl) is a chemical compound in which polar covalent bond is present between hydrogen atom and chlorine atom.
This bond is not so strong enough to maintain the stability in the liquid phase, else they are weak intermolecular forces and easily gets break through small amount of energy and having low boiling point. That's why HCl is present in gaseous state at room temperature.
Hence due to weak intermolecular force, HCl is present in gaseous state.
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Which of the following is not a molecular formula?
N₂020
N₂08
N₂04
NO₂
Answer:
N2020
Explanation:
I’m not fully sure but I’m pretty sure it’s wrong
In the important industrial process for producing ammonia (the Haber Process), the overall reaction is:
N2(g) + 3H2(g) → 2NH3(g) + 100.4 kJ
A yield of NH3 of approximately 98% can be obtained at 200°C and 1,000 atmospheres of pressure.
This reaction is:
endothermic or exothermic? (please answer) thanks for any help:) it mean a lot
Answer:
The reaction is exothermic.
An element in Group 2 of the periodic table likely has which characteristics?
Answer:
Shiny solid. Conducts heat and electricity. Easily bends
Explanation: