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Related Questions
Under identical conditions, separate samples of O2 and an unknown gas were allowed to effuse through identical membranes simultaneously. After a certain amount of time, it was found that 7.88 mL of O2 had passed through the membrane, but only 3.69 mL of of the unknown gas had passed through. What is the molar mass of the unknown gas
Answers
Answer:
146.5g/mol
Explanation:
The volume of gas effused is directly proportional to the square root of its relative molecular mass.
Let the volume of oxygen gas be V1
Let the volume of the unknown gas be V2
Let the molar mass of oxygen be M1
Let the molar mass of the unknown gas be M2
V1/V2 =√M2/M1
7.88/3.69 = √M2/32
2.14 = √M2/32
(2.14)^2 = M2/32
4.58 = M2/32
M2 = 32*4.58
M2 = 146.5g/mol
Can someone help me please on this question like quick?
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Solar energy does not give off toxic wastes as nuclear energy does (ex. Chernobyl)
What will happen to bring the substance from a solid to a gas?
The substance will lose pressure.
Energy will be added.
Energy will be taken away.
The substance will lose volume.
Answers
Answer:
B) Energy will be added
Explanation:
I just took the test...
Fall is usually a little warmer than spring. And yet, the Sun's path is the same in both seasons. Select all that apply.PLEASE ANSWER CORRECTLY I WILL GIVE BRAINLIEST!-THIS IS SCIENCE
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(Al = 27.0 g, O = 16.0 g, H = 1.0 g)
2 Al(OH)3 Al2O3 + 3 H2O
how many grams are produced from .85 moles of AI(OH)3
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Answer:
Explanation:
21
_NaF + _Br2 →_NaBr + _F2
Answers
Answer:
2NaF + 1Br2 -> 2NaBr + 1F2
Explanation:
2NaF + 1Br2 -> 2NaBr + 1F2
I simply looked at both the left side and right side and saw there was only 1 F on the left side while there were 2 on the right side.
This means we have to make the left side have 2 F by multiplying NaF by 2.
However, this means there are now 2 Na as well. Going back to the right side, I multiplied NaBr by 2 so that there are 2 Na on both sides.
Now there are 2 Br on the right side. Checking back to the left side, there are also 2 Br, meaning this equation is now balanced.
Which element easily loses one electron to form a positive ion? (AKS 1c/DOK 1)
A.
Nitrogen (N)
B.
Bromine (Br)
C.
Potassium (K)
D.
Magnesium (Mg)
Answers
Answer:
Potassium
Explanation:
It's in group 1 in the periodic table of elements
HELP! WILL GIVE BRAINLIEST DUE SOON
Dome Mountains are formed when:
A: plateaus are eroded away
B: faults rub against each other
C: magma escapes from the crust
D: magma pushes up sedimentary rock
Answers
Answer:
I am not the best to answer this but I think it would be B
Explanation:
So it’s D.
Plz help mee
Sandy soil
A) holds water well
B) contains clay and humus
C) has loose grains and few nutrients
Answers
A
think of this way: in Florida and many other costal places, people have sand in their backyards to limit flooding and things due to being so close to the ocean.
what is the answer?!!?
Plzzzz help
Answers
Answer:
The planet would stop
Good luck!
how many moles of each atom in the formula HClO3
Answers
Answer:
H has one mole
Cl has one mole
O has three mole
Explanation:
There is a single Hydrogen, thus there is one mole, this also applies to Cl.
With Oxygen, there are three O's, thus there are three moles of Oxygen.
There are 1 mole of H, 1 mole of Cl, and 3 moles of O.
Number of moles in molecules
The number of moles of an atom present in a molecule is classified as the number located in the lower right corner of that atom in the molecule, for example, in the water molecule below:
[tex]H_2O[/tex]
you have 2 moles of hydrogen and 1 mole of oxygen.
Thus, in the HClO3 molecule, there are 1 mol of hydrogen, 1 mol of chlorine and 3 mol of oxygen.
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Amy set up the following experiment to study how plant growth is influenced by weather conditions. mc052-1 One pot will model normal growing conditions, and the other will model drought conditions. Which of the following factors is it most important for Amy to change to model drought conditions?
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Answer:
lack of sunlight, overcrowded region for shelter of the plants, no nutrients and water supply, etc.
Explanation:
The plants needs favorable climatic conditions and nutrient to grow. Plants need air, sunlight, water, proper temperature, nutrients, etc. grow and make their food. They make their food with the help of sunlight and carbon dioxide by a process called as photosynthesis.
Now in the context, Amy is setting up an experiment where she will study the growth of plants in two models. One in the normal growing conditions and the other in a drought condition.
Drought is considered the most important abiotic factor that limits the growth and adversely affects the growth and the crop. The factor that is important for Amy to change the model into a drought conditions is the lack of water and carbon dioxide in the atmosphere. Also scarcity of sunlight and nutrients. The drought stress is considered as one of the crop performance limiting factors.
PLEASE HELP ME
How many grams of lithium are needed to produce 45 Og of lithium nitride, according to the following process? 6 Li(s) + N2(g) → 2 Li3N(s)
Answers
Li
3
N
is
20.9 g
.
Explanation:
Balanced Equation
6Li(s)
+
N
2
(
g
)
→
2Li
3
N(s)
In order to determine the theoretical yield, we must first find the limiting reactant (reagent), which will determine the greatest possible amount of product that can be produced.
Molar Masses
Li
:
6.941 g/mol
N
2
:
(
2
×
14.007
g/mol
)
=
28.014 g/mol
Li
3
N
:
(
3
×
6.941
g/mol Li
)
+
(
1
×
14.007
g/mol N
)
=
34.83 g/mol Li
3
N
Limiting Reactant
Divide the mass of each reactant by its molar mass, then multiply times the mole ratio from the balanced equation with the product on top and the reactant on bottom, then multiply times the molar mass of
Li
3
N
.
Lithium
12.5
g Li
×
1
mol Li
6.941
g Li
×
2
mol Li
3
N
6
mol Li
×
34.83
g Li
3
N
1
mol Li
3
N
=
20.9 g Li
3
N
Nitrogen Gas
34.1
g N
2
×
1
mol N
2
28.014
g N
2
×
2
mol Li
3
N
1
mol N
2
×
34.83
g Li
3
N
1
mol Li
3
N
=
84.8 g Li
3
N
Lithium produces less lithium nitride than nitrogen gas. Therefore, the limiting reactant is lithium, and the theoretical yield of lithium nitride is
20.9 g
.
Which are characteristics of electromagnetic waves? Check all that apply.
travel in straight lines and can bounce off surfaces
travel through space at the speed of light
travel only through matter
travel only through space
can bend around objects
move by particles bumping into each other
move by the interaction between an electric field and a magnetic field
Answers
-travel through space at the speed of light
-can bend around objects
-move by the interaction between an electric field and a magnetic field
The characteristics of electromagnetic waves are that they travel in straight lines and can bounce off surfaces,travel through space at speed of light,can bend around objects,move by interaction between electric field and magnetic field.
What are electromagnetic waves?The electromagnetic radiation consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.
The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.
In vacuum ,all the electromagnetic waves travel at the same speed that is with the speed of air.The position of an electromagnetic wave in an electromagnetic spectrum is characterized by it's frequency or wavelength.They are emitted by electrically charged particles which undergo acceleration and subsequently interact with other charged particles.
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S plus 11r minus fifteen
Answers
Answer:
s+11r-15
Explanation:
Pls help I’ll mark brainliest
Answers
Answer: I will answer if u Mark me
Explanation:
4 points 15. The diagram below shows the relative positions of Earth, the moon, and the sun. The moon is shown at four possible positions around Earth. 3 Sunlight Sun Earth mo Which position of the moon could result in a lunar eclipse? В. 2 A B
Answers
Answer:
b c
Explanation:
Answer: b c
Explanation: i did test
The surface area of a star can be estimated based on the stars
Answers
What is the mass in grams of 5.2 moles of NaCl?
303.89 g
0.09 g
119.6 g
1828
Answers
Explanation:
mole=mass/molar mass
mass= mole×molar mass
m= 5.2×( 23+35.5)
m= 5.2×58.5
m= 304.2g
1. Determine the mass of 2.5 mol of AgNO3
Answers
Explanation:
1 gram of AGNO3 is 169,87 g/mol
2.5 mole = 2.5×16987
= 42467
3.0m3 of sulfer dioxide is reacted with 2.0dm3 of oxygen . What volume of sulfur trioxide is form?
Answers
Answer:
3.0 dm^3 of sulphur trioxide is formed
Explanation:
From Gay Lussac's law of combining volumes;
The equation is;
SO2(g) + 1/2O2(g) ------> SO3(g)
Reacting volumes 1 vol 1/2 vol 1 vol
Initial volumes 3.0 dm^3 2.0 dm^3 0.0 dm^3
Final volumes 0.00 dm^3 1.5 dm^3 3.0 dm^3
Hence, 3.0 dm^3 of sulphur trioxide is formed.
The electron configuration for Zn2 is [Ar] 3d10 and NOT [Ar] 4s23d8. What experimental evidence has been collected that would allow one to conclude that the [Ar]3d10 is correct
Answers
Answer:
Zn2+ is colourless
Explanation:
We know that transition metal salts are usually coloured due to the possibility of d-d transition.
This d-d transition can only occur when there are vacant d-orbitals. The electronic configuration [Ar] 4s23d8 suggests the presence of vacant d-orbitals and the possibility of the compounds of Zn2+ being coloured.
However, the absence of colours in Zn2+ compounds shows that there is no d-d transition(electronic) spectra observed for Zn2+ because the d orbitals are completely filled. This means that the correct electronic configuration of the ion is [Ar] 3d10.
Why is classification important?
Answers
The octane rating of gasoline is a relationship of the burning efficiency of the given gasoline mixture to the burning efficiency of octane (C8H18). Like most hydrocarbons, octane reacts with oxygen gas to produce carbon dioxide and water. The unbalanced equation for this reaction is
Answers
Answer:
C₈H₁₈(l) + O₂(g) ⇒ CO₂(g) + H₂O(l)
Explanation:
Let's consider the unbalanced equation for the combustion reaction of octane.
C₈H₁₈(l) + O₂(g) ⇒ CO₂(g) + H₂O(l)
We can begin balancing H atoms by multiplying H₂O by 9, and C atoms by multiplying CO₂ by 8.
C₈H₁₈(l) + O₂(g) ⇒ 8 CO₂(g) + 9 H₂O(l)
Finally, we get the balanced equation by multiplying O₂ by 12.5.
C₈H₁₈(l) + 12.5 O₂(g) ⇒ 8 CO₂(g) + 9 H₂O(l)
Answer:
The coefficents will be 2, 25 --> 16, 18
Explanation:
correct name for PtO.
Answers
Answer:
It may stand for 'Paid Time Off'
Explanation:
I need more context but that's probably it.
Answer:
gracias
Explanation:
A fifth-grade science class puts half of a white tablet in a test tube with 10 milliliters (mL) of water at 21°C (70°F). The tablet bubbles rapidly for three minutes until it is gone. Students record the final temperature at 20°C (68°F). Which choice best identifies evidence that a chemical reaction occurred?
Answers
Answer:
i think it table broke in half
Explanation:
Answer: it would be change in water temperature
Explanation: because the change in the water is the temperature and its is
evaporation
What is always true of a strong acid?
A. It does not dissociate at all in solution.
B. It has not been diluted with water.
C. It has more than one hydrogen atom.
D. It dissociates completely in solution.
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Considering the definition of strong acid, it dissociates completely in solution (option D) is always true of a strong acid.
Definition of strong acidAn acid that completely dissociates in solution at constant temperature and pressure is called a strong acid.
In other words, strong acids are completely ionized, that is, in the ionization process they are completely transformed into cations or positive ions and anions or negative ions.
Strong acids are characterized by being very corrosive and have the ability to conduct electrical energy efficiently.
Examples of strong acids are hydrochloric acid (HCI) and hydrobromic acid (HBr).
SummaryIt dissociates completely in solution (option D) is always true of a strong acid.
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Consider the sodium borohydride reduction of camphor to isoborneol. A reaction was performed in which 1.600 g of camphor was reduced by an excess of sodium borohydride to make 1.062 g of isoborneol. Calculate the theoretical yield and percent yield for this reaction. Theoretical yield: g Percent yield:
Answers
Answer:
62.5%
Explanation:
Number of moles of camphor reacted= 1.6g/152.23 g/mol = 0.011 moles
Since the reaction is 1:1, then 0.011 moles of isoborenol is also produced.
Theoretical yield of isoborenol produced = 154.25 g/mol * 0.011 moles = 1.698 g
% yield = actual yield/theoretical yield * 100
% yield = 1.062 g/1.698 g * 100
% yield = 62.5%
what happens to ammonia when reacts with heated sodium?
Answers
Answer:
When dry ammonia is passed over heated sodium in absence of air, the product formed is sodium amide. - When dry ammonia is passed over heated sodium in absence of air, sodium amide is produced. - Sodium amide aka sodamide is mainly used as a strong base in organic chemistry.
Explanation:
Chlorine reacts with sodium and with hydrogen.
Compare the structure and bonding in sodium chloride and hydrogen chloride.
Answers
Answer:
Sodium Chloride has Ionic bond while Hydrogen Chloride has covalent bond.
Explanation:
Na has 11 electrons (2, 8, 1) and need to give away 1 electron to be stable
Cl has 17 electrons ( 2, 8, 7) and needs 1 electron to be stable.
Na transfers 1 electron to CL to form Ionic bond.
While
Hydrogen has 1 electron and shares with Chlorine to be stable.
Covalent bond involves sharing.
Chlorine reacts with sodium to form ionic sodium chloride while chlorine reacts with hydrogen to form covalent hydrogen chloride.
The nature of bonding between atoms depends on their relative difference in electronegativity.
Chemical bonding is the process by which atoms come together to form compounds.
There are different kinds of chemical bonds;
Ionic or electrovalent bondCovalent bondMetallic bondAn ionic bond is formed when there is high electronegativity difference between the bonding atoms. Typically, this type of bond is formed when the electronegativity difference is about 2.0 and above.
For a covalent bond, an electronegativity difference of about 0.4 - 1.7 is considered a polar covalent bond. Lower values of electronegativity difference corresponds to a nonpolar bond.
The electronegativity difference between sodium and chlorine is about 2.23. This corresponds to a pure ionic bond. The compound is composed of chlorine and sodium ion pairs alternately located in a crystal lattice as shown in the image attached.
The electronegativity difference between chlorine and hydrogen is about 0.96. This corresponds to a polar covalent bond. The negative end of the dipole points towards chlorine while the positive end of the dipole points towards hydrogen.
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