which lunar phase will occur about four days after a waxing crescent?
A. waning crescent
B.first quarter
C.full moon
D.waning gibbous
Answer:3.5 days is awfully precise and waxing gibbous is awfully vague.Let’s just make sure we understand our terminology. Waxing means getting fatter and gibbous means fat. A waxing gibbous moon lasts for approximately 7 days from the first quarter phase right up to the full moon phase.By 3.5 days I’m assuming you mean half a week and simplifying the lunar phases to 28 days exactly.So we have:Day 0 New moon.Day 7 First quarter.Day 14 Full moon.Day 21 Third quarter.Day 28 New Moon.Between day 0 - 7 we have the waxing crescent phase.Between day 7–14 we have the waxing gibbous phase.Between day 14–21 we have the waning gibbous phase.Between day 21–28 we have the waning crescent phase.So 3.5 days from day 7 would take us to day 10.5 which would still leave us in the waxing gibbous phase. 3.5 days after day 10.5 would take us to the full moon or over into the waning gibbous phase since the full moon lasts only an instant.
Explanation:
Waning gibbous is the lunar phase which will occur about four days after a waxing crescent. Therefore, the correct option is option D.
What is lunar phase?The lunar phase and Moon phase is indeed the shape of the directly illuminated section of the Moon, which may be described quantitatively using areas and angles. The lunar month is typically 29.53 days as seen from Earth.
The four major phases (new moon, first quarter, full moon, and last quarter) and four minor phases are qualitatively described. The orbital locations of the Moon round Earth and Earth from around Sun fluctuate throughout the course of a synodic month (about 29.53 days), which causes a gradual change in the lunar phases. Waning gibbous is the lunar phase which will occur about four days after a waxing crescent.
Therefore, the correct option is option D.
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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
Water 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 !!!!
Which animal is in higher trophic level dolphins or plankton
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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An element in Group 2 of the periodic table likely has which characteristics?
Answer:
Shiny solid. Conducts heat and electricity. Easily bends
Explanation:
9. The use of lubricants makes the surface
(a) Rough
(b)Smooth
(c)Very Rough
(d)None of the above
Answer:
B
Explanation:
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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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.
ANSWER ASAP!!!! PLS HELP
Answer: increase
Explanation: as pressure is increased, equlilibrium shifts towards the side with less moles of gas.
Iron(111)Carbonate +cesium > cesium carbonate +iron balced
Balanced chemical equation for the given reaction is Fe₂(CO₃)₃ + 6Cs → 3Cs₂CO₃ + 2Fe.
What is balanced equation?Balanced chemical equations are those equations in which all entities are present in equal amount on reactant side as well as on product side.
Given balanced chemical reaction is:
Fe₂(CO₃)₃ + 6Cs → 3Cs₂CO₃ + 2Fe
Above given equation is a balanced chemical equation where all atoms of reactant as well as of products are present in same amount.
Hence, required balanced equation is Fe₂(CO₃)₃ + 6Cs → 3Cs₂CO₃ + 2Fe.
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Which element could be included in a hydrocarbon?
Ca
Zn
Cl
Sn
Answer:
Cl
Explanation:
Hydrocarbons are Carbon chains that contain at least one halogen (F, Cl, Br, I and At)
Cl is a halogen
(I got this right on the test too)
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
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.
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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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
?? 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
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
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.
a hydrochloric acid solution HCI has a concentration of 12.1 M. A 41.2 mL sample is used to make a more dilute solution. If the new solution has a concentration of 0.5 M determine the volume of the solution
If the new solution has a concentration of 0.5 M, then the volume of the solution is 997mL.
How do we calculate the required volume?Required volume of the new solution will be calculated by using the below equation as:
M₁V₁ = M₂V₂, where
M₁ & V₁ are the molarity and volume of initial HCl solution.
M₂ & V₂ are the molarity and volume of final HCl solution.
On putting values from the question, to the above question we get:
V₂ = (12.1)(41.2) / (0.5) = 997 mL
Hence resultant volume of the final solution is 997 mL.
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Convert 1060 mm Hg to atm. (answer should include 3 sig. fig and NO LABEL)
Answer:
1.39
Explanation:
1060 mm / 760 mm/atm = 1.39 atm
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:
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)
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:
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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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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What is the hydronium ion concetration of a ph=9. 2 solution
The hydronium ion concentration of a pH = 9.2 of solution is 6.3 × 10⁻¹⁰M.
How do we calculate pH?pH of the solution is define as the negative logarithm of the concentration of the hydronium ion as:
pH = -log[H⁺]
Or [H⁺] = [tex]10^{-pH}[/tex]
Given that pH value = 9.2
On putting values, we get
[H⁺] = [tex]10^{-9.2}[/tex] = 6.3 × 10⁻¹⁰M
Hence required concentration of hydronium ion is 6.3 × 10⁻¹⁰M.
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What does a positive value of A Gº mean for a reaction?
O A. The reaction is spontaneous if AS<0.
O
B. The reaction is spontaneous.
C. The reaction is spontaneous if A S> 0.
D. The reaction is nonspontaneous.
Answer:
D
Explanation:
If delta G at standard conditions is positive, then the reaction will always be nonspontaneous in the forward direction.