The phase of the moon you see depends on
Answer:
The phases of the Moon depend on the moon's position compared to the Earth and the Sun. Remember that the moon revolves around the Earth. As the moon goes around the Earth, half of the moon is always illuminated by the Sun.
A music performance takes place in an enclosed arena. A person sitting a distance of 20.0 m from the speaker experiences a sound intensity of 0.32 W/m2. What is the power of the speaker? (Assume that the area over which the speaker transmits sound is given by A = 4πd2, where d is the distance from the speaker.)
A.
100 W
B.
550 W
C.
1,200 W
D.
1,600 W
Can you answer these two questions right please and thank you
Answer:
B. LZAQD
A. Younger than A but older than Q
Explanation:
To solve this problem, we simply apply the stratigraphic laws which are the law of superposition and principle of cross cutting.
According to the law of superposition, in an undeformed sequence of strata, the oldest layer is always at the bottom and the youngest on top. In this case, we have a little disturbance but it did not affect much of the original bedding. So, the rock ages from L to Z to A to Q and D. L is the oldest and D is the youngest.According to the principle of cross-cutting "features that cuts through a rock are younger than the layers they cut through". In this problem, the fault cuts through layers LZ and A which suggests that these layers are older than the faulting event. Layer Q is unaffected by the faulting so, the fault is older than the layer.
Which statement describes an example of a chemical property of a metal statue?
O It is metal.
O It can tarnish.
OIt is solid.
OIt is shiny.
Answer:
The answer is "it can tarnish"
Explanation:
The statement describes an example of a chemical property of a metal statue is that it can tarnish.
Chemical properties are defined as those properties which become evident during or after a chemical reaction has taken place.
These properties cannot be determined externally just by viewing the substance ,these change immensely after a substance undergoes a chemical change.These are used for identification of unknown substances and used for building up chemical classifications.
The major chemical properties include flammability,toxicity,reactivity,acidity and heat of combustion.For a chemical property to be apparent , it is necessary that the structure of the substance is altered.
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Scenario Three: Carbon dioxide emissions increase
• Set the carbon dioxide emissions rate to 9.8 gigatons.
• Set the time step size to 10 years.
• Select the step forward button once.
• Increase the carbon dioxide emissions by 0.2 and press step forward.
• Continue stepping forward once, increasing the carbon emissions each time, until you reach 2110.
• Record the data in the table below.
Maintain carbon dioxide emissions at 9.8 for the rest of scenario one.
2020 9.8 58
2030 9.8 58.5
2040 9.8 58.9
2050 9.8 59.1
2060 9.8 59.5
2070 9.8 59.8
2080 9.8 60
2090 9.8 60.1
2100 9.8 60.5
2110 9.8 60.9
Suppose the current flowing from a battery is used to electroplate an object with silver. Calculate the mass of silver that would be deposited by a battery that delivers 1.65 A·hr of charge.
Answer:
m = 0.00659 kg = 6.59 g
Explanation:
From Faraday's Law of Electrolysis, we know that:
m = ZQ
where,
m = mass of silver deposited = ?
Q = charge supplied = (1.65 A-hr)(3600 s/1 hr) = 5940 C
Z = electrochemical equivalent of silver = 1.18 x 10⁻⁶ kg/C
Therefore,
m = (1.11 x 10⁻⁶ kg/C)(5940 C)
m = 0.00659 kg = 6.59 g
The mass of silver that would be deposited by a battery is 6.65 grams
The precipitation of Ag requires the removal of one electron. The reduction process for silver electrode at the cathode is as follows:
[tex]\mathbf{Ag^+ + e^- \to Ag(s)}[/tex]
The current flowing in the battery = 1.65 A = 1.65 C/sThe time at which the current is flowing = 1 hr = 3600sec∴
The charge Q = Current (I) × time (t)Charge Q = 1.65 C/s × 3600 sCharge (Q) = 5940 CIn one mole of an electron, the charge carried = 96500 C
Recall that:
The atomic mass of silver (Ag) = 108 g
∴
The mass of silver that would be deposited in a 5940 C can be computed as:
[tex]\mathbf{=5940\ C \times \dfrac{108 \ g }{96500 \ C}}[/tex]
= 6.65 grams
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A 75 mL solid is estimated by a student to be 81 mL. Calculate the percent error.
Answer:
8 %Explanation:
The percentage error of a certain measurement can be found by using the formula
[tex]P(\%) = \frac{error}{actual \: \: number} \times 100\% \\ [/tex]
From the question
error = 81 - 75 = 6 mL
actual volume = 75 ml
We have
[tex]p(\%) = \frac{6}{75} \times 100 \\ = \frac{2}{25} \times 100 \\ = 2 \times 4 \\ = 8 \: \: \: \: \: \: \: \: [/tex]
We have the final answer as
8 %Hope this helps you
How many moles of KCI would be dissolved in 4 L of water to make a 2 M
solution?
1
A.
mole
B. 2 moles
C. 8 moles
D. 4 moles
Answer:
C. 8 Moles
Explanation:
What might happen if you mixed a strong acid with an equally strong base? Question 2 options:
A.You'd wind up with a pH-neutral salt and water.
B.You would see an explosive chemical reaction.
C.The base would destroy the acid.
D.The acid would destroy the base.
Answer:
b
Explanation:
The atomic of nitrogen is 7. The number of electrons a neutral atom has is_, and its atomic mass is approximately_amu.
Electrons - 7
Atomic mass - 14
For future reference, you can find the number of Electrons by subtracting the number of protons (7) from the element's mass number (14
We know, Atomic Number = Number of Electrons (In a neutral atom).
& Atomic mass = Number of protons + Number of Neutrons
The atomic number of nitrogen is 7. The number of electrons a neutral nitrogen atom has is "Seven (7)", and its atomic mass is approximately "Fourteen(14)" amu
Hope this helps!
Calculate how many grams of sodium hypochlorite can be theoretically formed when 1.23 mol of sodium hydroxide is combined with 1.36 mol of chlorine.
Answer:
45.78 g NaClO
Explanation:
The reaction that takes place is:
2NaOH + Cl₂ → NaCl + NaClO + H₂OIn order to react completely, 1.36 moles of chlorine would require (2*1.36) 2.72 moles of NaOH. There are more moles than that, so NaOH is the limiting reactant.
We calculate the moles of NaClO formed, from the limiting reactant:
1.23 mol NaOH * [tex]\frac{1molNaClO}{2molNaOH}[/tex] = 0.615 mol NaClOFinally we convert NaClO moles to grams, using its molecular weight:
0.615 mol NaClO * 74.44 g/mol = 45.78 g NaClOwhat is aluminum’s nuclear charge?
Answer:All six of the ions contain 10 electrons in the 1s, 2s, and 2p orbitals, but the nuclear charge varies from +7 (N) to +13 (Al)
Explanation:
hope this helped if it did may i have brainliest
plz help me.......
questiion: Following are the correct statements for actual yield except
1:amount of product obtained in a chemical reaction
2:always less than theoretical yield
3:none
4:product calculated from the balanced chemical equation
why do we need air? If you know please answer this
Answer:
I found this on the internet People need to breathe, and so do lots of other animals—and plants! Breathing is part of a process called respiration. During respiration, a living thing takes in oxygen from the air and gives out carbon dioxide.
Explanation:
10 Interesting Things About Air | NASA Climate Kidsclimatekids.nasa.gov › 10-things-air
Your welcome!
to breath
with out air we can't live here
Stoichiometric coefficients indicate the ratio between ________of given substances in a chemical reaction
a) moles
b) molecules
c) molar masses
d) masses
both a) and b)
any of the a), b), c) and d)
both a) and c)
only b)
only a)
Answer:
b
Explanation:
to make a solute dissolve more quikly in a solvent wich whould you do? a. stir it in cold water b.stir it in warm water c.solvent d.lets the solute settle down d. nothing to do with the solute?
Answer:
b.stir it in warm water
Explanation:
the slobility will be faster in the high temperture
A reaction vessel is charged with 0.50 atm of A and 0.030 atm of B. Once the reaction reaches equilibrium, what is the equilibrium partial pressure of B? Kp for this reaction is 67.2A (g) ⇌ 2 B (g)
Answer:
1.000 atm
Explanation:
Step 1: Write the reversible reaction
A(g) ⇌ 2 B(g)
Step 2: Calculate the reaction quotient
Q = [B]²/[A]
Q = 0.030²/0.50
Q = 0.0018
since Q < Kp, the reaction will proceed to the right
Step 3: Make an ICE chart
A(g) ⇌ 2 B(g)
I 0.50 0.030
C -x +2x
E 0.50-x 0.030+2x
Step 4: Find the value of "x"
We will use the definition of the pressure equilibrium constant.
Kp = 67.2 = [B]²/[A] = (0.030+2x)²/0.50-x
33.6 - 67.2x = 0.0009 + 0.12x + 4x²
4x² + 67.32x -33.5991 = 0
We solve this quadratic equation and we get x=0.485112 and x=−17.3151 (neglected).
Step 5: Find the partial pressure of B at equilibrium
pB = 0.030+2x = 0.030+2(0.485112) = 1.000 atm
The equilibrium partial pressure of B would be:
[tex]1.000 atm[/tex]
Reversible Reaction
Given that,
Reaction
[tex]A(g)[/tex] ⇄ [tex]2 B(g)[/tex]
Charge on the reaction vessel [tex]= 0.50 atm[/tex] of A
[tex]0.030 atm[/tex] of B
To find,
Reaction quotient first
[tex]= B^2/A\\= (0.030)^2/0.50\\= 0.0018[/tex]
This shows that the reaction quotient is greater than Kp.
Through the reaction [tex]A(g)[/tex] ⇄ [tex]2 B(g)[/tex], ICE can be drawn
I [tex]0.50[/tex] [tex]0.030[/tex]
C [tex]-x[/tex] [tex]+2x[/tex]
E [tex]0.50-x[/tex] [tex]0.030+2x[/tex]
Now,
We will determine the value of [tex]x[/tex],
Kp [tex]= 67.2[/tex]
[tex]= [B]^2/[A][/tex]
[tex]= (0.030+2x)^2/0.50-x[/tex]
⇒ [tex]33.6 - 67.2x[/tex] [tex]= 0.0009 + 0.12x + 4x^2[/tex]
⇒ [tex]4x^2 + 67.32x -33.5991 = 0[/tex]
∵ [tex]x = -17.3151[/tex]
Therefore, Equilibrium Partial Pressure
[tex]= 0.030+2x[/tex]
[tex]= 0.030+2(0.485112)[/tex]
= [tex]1.000[/tex] atm
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1. A physician ordered 2.0 milligrams tetracycline to be given to a patient. If the tetracycline was available as 0.75 mg/mL of solution, how many milliliters would you give to the patient
Answer:
2.67 mL
Explanation:
The following data were obtained from the question:
Mass of tetracycline = 2 mg
Density of tetracycline = 0.75 mg/mL
Volume of tetracycline =?
We can obtain the volume of the tetracycline that should be given to the patient by applying the following equation:
Density = mass /volume
0.75 = 2 / volume
Cross multiply
0.75 × Volume = 2
Divide both side by 0.75
Volume = 2/0.75
Volume = 2.67 mL
Therefore, the volume of the tetracycline that should be given to the patient is 2.67 mL
I need HALP so yea halp mee please
Calculate molecules in 1dm^3 of oxygen
Number of molecules in 1 dm³ Oxygen = 2.71 x 10²²
Further explanationConditions at T 0 ° C and P 1 atm are stated by STP (Standard Temperature and Pressure). At STP, Vm is 22.4 liters/mol.
The mole is the number of particles contained in a substance
1 mol = 6.02.10²³
1 dm³ of oxygen = 1 L Oxygen
mol Oxygen :[tex]\tt \dfrac{1}{22.4}=0.045`mol[/tex]
molecules of Oxygen :n=mol=0.045
No = 6.02.10²³
[tex]\tt N=n\times No\\\\N=0.045\times 6.02\times 10^{23}\\\\N=2.71\times 10^{22}[/tex]
What are two cases when a cell must use active transport in order to move materials?
Answer:
A cell must use active transport in order to move materials in the process Phagocytosis and Pinocytosis
12.5 mL of 6.0 M KCl is diluted to make a 1.5 L solution. The molarity of the dilution solution is ___ M. (Round atomic masses to the nearest whole number. Include 2 sig figs total in your answer.)
The molarity of the dilution solution is 0.050 M
Further explanationMolarity is a way to express the concentration of the solution
Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution
[tex]\large{\boxed {\bold {M ~ = ~ \frac {n} {V}}}[/tex]
Where
M = Molarity
n = Number of moles of solute
V = Volume of solution
Dilution formula :
[tex]\tt M_1.V_1=M_2.V_2[/tex]
M₁=6 M
V₁=12.5 ml
V₂=1.5 L=1500 ml
[tex]\tt 6\times 12.5=M_2\times 1500\\\\M_2=\dfrac{6\times 12.5}{1500}=0.05~M\\\\for~sig.fig\rightarrow 0.050~M[/tex]
A scientist wants to make a solution of tribasic sodium phosphate, Na3PO4, for a laboratory experiment. How many grams of Na3PO4 will be needed to produce 725 mL of a solution that has a concentration of Na ions of 1.30 M
Answer:
51.53 grams .
Explanation:
Na₃PO₄ ⇄ 3Na⁺¹ + PO₄⁻³ .
1 mole 3 mole
725 mL of 1.3 M Na⁺ ions
= .725 x 1.3 moles of Na⁺ ions
= .9425 moles
3 mole of Na⁺ is formed by 1 mole of Na₃PO₄
.9425 mole of Na⁺ is formed by .9425/3 mole of Na₃PO₄
Na₃PO₄ needed = .9425/3 moles = .3142 moles
Molecular weight of Na₃PO₄ = 164
grams of Na₃PO₄ needed = .3142 x 164 = 51.53 grams .
Which isomer of 1-bromo-4-tert-butylcyclohexane reacts faster when refluxed with potassium tert-butoxide?
Answer:
See explanation.
Explanation:
Since potassium tert-butoxide is a strong bulky base, we expect that an elimination reaction predominates.
This reaction is expected to occur by E2 mechanism. The cis isomer of 1-bromo-4-tert-butylcyclohexane is known to react faster by E2 mechanism because it fulfills the anticoplanar arrangement required for for E2 mechanism, where the leaving group and adjacent proton must be anti to each other and in the same plane. The trans isomer can not fulfill this requirement.
3. Theoretically how many grams of magnesium is required to produce to 5.0 g of
Magnesium oxide?
Answer:
3grams
Explanation:
The reaction for the production of Magnesium dioxide will be
Mg + O2 → MgO
we have 5g of MgO (molar mass 40g)
no of moles of MgO = 5/40 = 0.125
Using unitary method we have
1 mole of Mg require 1 mole of MgO
0.125 Mole of MgO = 0.125mole of Mg
n = given mass /molar mass
0.125 = mass / molar mass
mass = 0.125* 24 = 3grams
A 2kg metal cylinder is supplied with 1600J of energy to heat it from 5*C to 13*C. What is the SHC of the metal?
Answer:
100Jkg/°C
Explanation:
Given parameters:
Mass of metal = 2kg
Amount of heat energy = 1600J
Initial temperature = 5°C
Final temperature = 13°C
Unknown:
Specific heat capacity of the metal = ?
Solution:
Specific heat capacity of a body is the amount of heat needed to raise the temperature of unit mass of a body by 1°C.
H = m x C x (T₂ - T₁ )
H is the amount of heat
m is the mass
C is the unknown specific heat capacity
T is the temperature
Insert the parameters and solve;
1600 = 2 x C x (13 - 5)
1600 = 16C
C = 100Jkg/°C
How do her cells use these molecules to release energy for her body to run?
Her cells use oxygen, in the oxidation of sugar(glucose) to provide energy in the body's admissible form (i.e ATP).
Her cells, like that of every animal depend on the oxidation of sugars particularly glucose by Oxygen, O2 to provide energy in a process termed Cellular respiration.
The process of cellular respiration in her cell occurs in the mitochondria although the first part of cellular respiration occurs in the cytoplasm.
Essentially, the process of cellular respiration is made of 3 metabolic pathways as follows;
GlycolysisKreb's cycleThe Electron Transport ChainUltimately, the admissible form of energy, the Adenosine Tri Phosphate-ATP is the end result of this glucose metabolism.
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In the metallurgic industry one of the processes to get pure iron takes tree steps.
a) CaCO3→CaO + CO2
b) CO2 + C → CO
c) Fe2O3 + CO → Fe + CO2
Calculate the kilograms of iron that would be produced from 1340 g of calcium carbonate.
Mass of Iron produced : 1.5 kg
Further explanationReaction
a) CaCO3→CaO + CO2
b) CO2 + C → 2CO
c) Fe2O3 + 3CO → 2Fe + 3CO2
From the reaction above : 1 mol CaCO₃ = 2 mol Fe
mol CaCO₃ :
1340 : 100 g/mol = 13.4
mol Fe :
2 x 13.4 = 26.8
mass Fe :
26.8 x 56 g/mol=1500.8 g⇒1.5 kg
2.00 mL of a 12.00 M HCL solution was reacted with 0.0450 grams of magnesium.?
Which reactant is the limiting reactant? Mathematically document your answer.
Answer:
Magnesium Mg will be the limiting reagent .
Explanation:
The limiting reagent is one that is first consumed in its entirety, determining the amount of product in the reaction. When the limiting reagent ends, the chemical reaction will stop.
In other words, the limiting reagent is that reagent that is consumed first in a chemical reaction, determining the amount of products obtained. The reaction depends on the limiting reagent, because the other reagents will not react when one is consumed.
In this case, the balanced reaction is:
Mg + 2 HCl ⇒ MgCl₂ + H₂
You know tha 2.00 mL of a 12.00 M HCl solution was reacted with 0.0450 grams of magnesium.
Being Molarity (M) the number of moles of solute that are dissolved in a certain volume, calculated by the expression:
[tex]Molarity=\frac{number of moles of solute}{volume}[/tex] ( Molarity is expressed in units [tex]\frac{moles}{liter}[/tex])
then the number of moles can be calculated as:
number of moles of solute=molarity* volume
So, being:
molarity= 12 Mvolume= 2 mL= 0.002 L (being 1,000 mL= 1 L)The number of moles of HCl that react is:
number of moles of HCl= 12 M*0.002 L= 0.024
On the other hand, since the molar mass of magnesium is 24.305 g / mol, then if 0.0450 grams of magnesium react, it indicates that they must react:
[tex]0.0450 grams*\frac{1 mol}{24.305 grams} = 0.00185 moles[/tex]
To determine the limiting reagent, it is possible to use the reaction stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), and a simple rule of three as follows: if by stoichiometry 1 mole of Mg reacts with 2 moles of HCl, how much moles of Mg will be needed if 0.024 moles of HCl react?
[tex]moles of Mg=\frac{0.024 moles of HCl*1 moles of Mg}{2 moles of HCl}[/tex]
moles of Mg= 0.012
But 0.012 moles of Mg are not available, 0.00185 moles are available. Since you have less moles than you need to react with 0.024 moles of HCl, magnesium Mg will be the limiting reagent .
A student has a balloon with a volume of 2.5 liters that contains 4.0 moles of air. The ballon has a small leak, allowing one mole to escape, leaving just 3.0 moles of air inside the balloon. What is the balloon's new volume after the air has escaped?
Answer:
1.9 L
Explanation:
Step 1: Given data
Initial number of moles of air (n₁): 4.0 molInitial volume of the balloon (V₁): 2.5 LFinal number of moles of air (n₂): 3.0 molFinal volume of the balloon (V₂): ?Step 2: Calculate the final volume of the balloon
According to Avogadro's law, the volume of an ideal gas is directly proportional to the number of moles. We can calculate the final volume of the balloon using the following expression.
V₁ / n₁ = V₂ / n₂
V₂ = V₁ × n₂ / n₁
V₂ = 2.5 L × 3.0 mol / 4.0 mol
V₂ = 1.9 L