Answer:
an electrical generator
Which specialized structures allow dolphins to breathe?
A. Watertight eggs
O B. Gills
C. Lungs
D. Milk-producing glands
Answer:
lungs
Explanation:
they don't have gills, and the milk producing glands and watertight eggs have nothing to do with it
Answer:
lungs
Explanation:
dolphins are mammals not fish
Calculate the moles of solid sulfur
Answer:
32.065 g
Explanation:
molecular weight of Sulfur or grams The molecular formula for Sulfur is S. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Sulfur, or 32.065 grams.
The element belongs to the p-block. It exhibits some characteristics of metals and some of nonmetals. It is a solid at room temperature. It contains 3d electrons, but not 4d electrons. It is also known NOT to have chemical properties similar to those of nitrogen. The element must be
Answer:
Arsenic
Explanation:
From the introduction given in the question, the element we are considering must be a member of group 15 because of its similarity to nitrogen.
We were also told that it exhibits the characteristics of metals and some nonmetals hence the element is a metalloid.
Lastly we were told that it contains 3d but not 4d electrons. This has ruled out antimony. Our only element standing now is arsenic!
The electronic configuration of arsenic is; [Ar] 3d¹⁰ 4s² 4p³. Hence the correct answer is arsenic.
Question 32. If scientist make an observation that does not agree with an accepted scientific theory, the scientists should
PLEASE HURRY
Answer:
I would say A.
Explanation:
At what temperature can 10g of Cez(SO4)3 be dissolved in 100g of water?
A.10
B.20
C.60
D.40
A drawback of the space shuttle was
Answer:
The space shuttle was the result of committee compromise and political expediency. It was never the best design. It takes off like a rocket (and blows up like one on occasion) and lands like a plane (or rather, it lands like a brick with control surfaces).
Explanation:
Answer:
The space shuttle was the result of committee compromise and political expediency. In 1990 Scientists decided to launch the space shuttle. It was never the best design. It takes off like a rocket (and blows up like one on occasion) and lands like a plane (or rather, it lands like a brick with control surfaces).
explain how density can be used as a conversion factor to convert the volume of an object to the mass of the object, and vice versa
Density is defined as the mass per unit volume it means that mass present in 1 meter cube. The S.I unit of density is kg/m^3 and in C.G.S and it is gram/cm^3
What is density?
Density is defined as the mass per unit volume it means that mass present in 1 meter cube. The S.I unit of density is kg/m^3 and in C.G.S and it is gram/cm^3
In above statement we can understand that density, mass, and volume all are convert to each other it means that if we know any two variable then third one will be calculated easily.
Mathematically,
Formula for density will be as mentioned below:-
Density = Mass/Volume.
From above formula we can calculate mass which is as follows:-
Mass = Volume × Density.
S.I unit of mass is kilograms and C.G.S unit is gram.
And similarly we can calculate the volume which is equal to as follows:-
Volume = mass / density.
S.I unit of volume is meter cube and C.G.S unit is cubic centimeter.
So, we can say that mass, volume and density all are dependent to each other and if any two is known we can easily calculate the third one.
Therefore, Density is defined as the mass per unit volume it means that mass present in 1 meter cube. The S.I unit of density is kg/m^3 and in C.G.S and it is gram/cm^3.
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During a lunar eclipse, what occurs? *
A. The Sun's shadow falls on the Moon.
B. The Moon's shadow falls on the Earth.
C. The Earth's shadow falls on the Moon.
D. The Moon's shadow falls on the Sun
Half of the Earth is dark. What is the dark half of Earth experiencing? *
A. A lunar eclipse
B. A solar eclipse
C. A power outage
D. Nighttime
A lunar eclipse in which the Moon lies completely in the Earth’s umbra is called a total lunar eclipse. In a penumbral lunar eclipse, the Moon lies partially in the penumbra. *
A. true
B. False
Each lunar cycle has one full moon, in which the relative positions of Earth, the sun, and the moon form in a straight line. Which list represents the position of Earth, the sun, and the moon during a full moon? *
A. Earth, sun, moon
B. sun, moon, Earth
C. moon, sun, Earth
D. sun, Earth, moon
Answer:
Lunar eclipse answer is
b
What mass of NaOH is needed to make 500mL of 4M solution
Answer:
80.0 grams NaOH
Explanation:
500 mL = 0.500 L
M = moles / liters
4 M = x moles / 0.500 L
Multiply both sides by 0.500 L
2 moles = x
Convert moles to grams
2 moles NaOH x (39.998 grams NaOH / 1 mole) = 80.0 grams NaOH
The formula for a buffer solution contains 1.24% w/v of boric acid. How many milliliters of a 5% w/v boric acid solution should be used to obtain the boric acid needed in preparing 1 L of the buffer solution
Answer:
248 mL of 5% w/v boric acid solution should be used to obtain the solution needed.
Explanation:
We can calculate the volume of the 5% w/v boric acid solution needed to prepare the buffer solution 1.24% w/v using the following equation:
[tex] C_{i}V_{i} = C_{f}V_{f} [/tex]
Where:
[tex]C_{i}[/tex]: is the concentration of the initial solution = 5% w/v
[tex]C_{f}[/tex]: is the concentration of the final solution = 1.24% w/v
[tex]V_{i}[/tex]: is the volume of the initial solution =?
[tex]V_{f}[/tex]: is the volume of the final solution = 1 L
Hence, the volume of the 5% solution is:
[tex] V_{i} = \frac{C_{f}V_{f}}{C_{i}} = \frac{1.24 \%*1 L}{5 \%} = 0.248 L = 248 mL [/tex]
Therefore, 248 mL of 5% w/v boric acid solution should be used to obtain the solution needed.
I hope it helps you!
what are two ways minerals fom? pause time 2:23
***Question in photo***
Is the entropy positive or negative in this question?
Answer:
Enthalpy change is negative
Entropy change is Positive
Explanation:
A nonmetal in the third period that should have chemical properties similar to oxygen.
Answer:
Sulfur
Explanation:
A non-metal in the third period that should have chemical properties similar to oxygen is sulfur.
This is because elements in the same group/family have similar chemical properties.
Chemical properties is predicated on the number of valence electrons within an atom. The number of valence electrons is the number of outermost shell electrons within an atom. Elements combines with one another using these valence shell electrons. Since sulfur is in the third period and the same vertical group as oxygen, they have similar chemical properties.What is the frequency of light whose wavelength is 6.33 x 10-7m?
Answer:
the frequency of light is
[tex]4.74 \times {10}^{14} [/tex]
Explanation:
from v = λf
speed of light in air, v = 3.0*10^8ms^-1
WHAT IS THE ABILITY OF A SUBSTANCE TO BE DISSOLVED
Answer:
Solubility
Explanation:
A4.5 g metal sample decreases in temperature from 48°C to 25°C when 68.5
of heat is removed from it. Calculate the specific heat capacity of the metal.
Answer:
[tex]C=0.662\frac{J}{g\°C}[/tex]
Explanation:
Hello!
In this case, since the heat removal when cooling down a body is computed via:
[tex]Q=mC\Delta T[/tex]
Given the removed heat, mass and temperature change, we solve for the heat capacity of the metal as shown below:
[tex]C=\frac{Q}{m\Delta T}[/tex]
Thus, by plugging in we obtain:
[tex]C=\frac{-68.5J}{4.5g*(25-48)\°C} \\\\C=0.662\frac{J}{g\°C}[/tex]
Best regards!
A sample of sodium hydroxide (NaOH) has a mass of 160.0 g. The molar mass of NaOH is 40.00 g/mol. How many moles of NaOH does this sample contain?
4.000
40.00
160.0
6,400
Answer:
4.000 (A)
Explanation:
Which of the complexes or complex ions has geometric (cis or trans) isomers?a. [Pt(NH3)2Cl2] (square planar)b. [Cr(NH3)4Cl2]+ c. [Cr(NH3)5Cl]2+ d. [Co(NH3)2Cl2]2− (tetrahedral)
Answer:
Explanation:
Out of four given compounds , two will show cis-trans isomerism .
They are as follows ,
[Pt(NH₃)₂Cl₂]
and
[Cr(NH₃)₄Cl₂]+
see the attached file.
Which of these has the most potential electrical energy?
Answer:
d beacuse it uses lots of electricity
Can strings be deformed?
Answer:
yeah why?
Explanation:
can u pls help me with this question
Answer:
The answer is Condensation which is water vapor in the air changes inot liquid water
Plzzzzzzz helpppppppppp
Answer:
False
Explanation:
A phenotype is physical characteristics, like eye color, and genotype is the code (tt, Tt, TT, that sort of thing) for it. A genotype can be dominant or recessive, dominant is capita, recessive is lowercase.
A sample of carbon monoxide gas occupies 3.20 L at
125 °C. At what temperature will the gas occupy a
volume of 1.54 L if the pressure remains constant?
The final temperature : 191.54 K = -81.46 °C
Further explanationGiven
V₁=3.2 L
T₁ = 125 +273 = 398 K
V₂=1.54 L
Required
The final temperature(T₂)
Solution
Charles's Law
When the gas pressure is kept constant, the gas volume is proportional to the temperature
[tex]\tt \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]
T₂=(V₂T₁)/V₁
T₂=(1.54 x 398)/3.2
T₂=191.54 K = -81.46 °C
Select the correct answer.
Carbon burns in the presence of oxygen to give carbon dioxide. Which chemical equation describes this reaction?
А. carbon + oxygen + carbon dioxide
B. carbon + oxygen carbon dioxide
C. carbon dioxide - carbon + oxygen
D. carbon dioxide + carbon - oxygen
Basically, carbon (C2) burns in the presence of adequate Oxygen (O2) to form carbon dioxide. Carbon is Quadro valent and is able to accept four more electrons. Oxygen has two electrons and hence, readily reacts with carbon to help break and make bonds. The chemical equation of carbon dioxide (CO2) is
carbon + oxygen → carbon dioxide or C2 + O2 = CO2
Answer:
C
Explanation:
Because it is the question that represents than carbon in the presence of oxygen give carbon dioxide.
Pls help thank you I really need
Answer:
A
Explanation:
Answer:
30 mph
Explanation:
A mole of a substance has a mass in grams that is equal to the molecular mass. For example, a carbon atom has a mass of 12.01 u. A mole of carbon has a mass of 12.01 g. Based on their molar masses, list the GFM of each substance.
Answer:
hello your question is incomplete attached below is the complete question
answer :
Fe2O3 = 159 g/mol
CO = 28.01 g/mol
Fe = 55.85 g/mol
CO2 = 44.01 g/mol
Explanation:
Molar mass for Fe2O3Fe = 55.85 g/mol
O = 16.0 g/mol
hence the molar mass of Fe2O3 = 2(55.85) + 3(16) = 159 g/mol
Molar mass for COC = 12.01 g/mol
O = 16.0 g/mol
hence the molar mass of CO = 28.01 g/mol
Molar mass for FeFe = 55.85 g/mol
Molar mass for CO2C = 12.01 g/mol
O = 16.0 g/mol
hence the molar mass of CO2 = 12.01 + 2(16) = 44.01 g/mol
Answer:
There ya go ;)
Explanation:
the diagram below represents the electromagnetic spectrum with some of the regions labeled with letters. Visble light is represented by which letter?
Answer:D
Explanation:
Which location is more likely to experience rain?
location a 67%
location b 23%
location c 45%
location d 88%
is the coil of a wire a magnet
Answer:
No necessarily it depends on if current is flowing through it.
What is the mass of 8.50 × 1022 molecules of NH3?
Answer:
The mass of 8.50 × 10²² NH₃ molecules is ≈ 1.84 g.
One mole of a molecule contains 6.02 × 10²³ molecules. The mass of 8.50 × 10²² molecules of NH₃ is 2.39 g.
What is ammonia (NH3)?Ammonia is an inorganic compound formed by hydrogen and nitrogen. Ammonia exists in gaseous state.
One mole of every element or compound contains 6.02 × 10²³ molecules. This number is called Avogadro number. The molar mass of ammonia is 17 g/l
It is given that the number of molecules of ammonia here, is 8.50 × 10²².
The no.of moles of ammonia = 8.50 × 10²²/ 6.02 × 10²³
= 0.141 moles.
If one mole ammonia is 17 g/l, the mass of 0.141 moles of NH₃ is calculated as follows: 0.141 × 17 = 2.39 g. Hence the mass of NH3 which contains 8.50 × 10²² molecules is 2.39 g.
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