a. 627.1 m/s
b. the rate of effusion of ethane = 1.7 faster than hexane
Further explanation
Given
T = 200 + 273 = 473 K
Required
a. the gas speed
b. The rate of effusion comparison
Solution
a.
Average velocities of gases can be expressed as root-mean-square averages. (V rms)
[tex]\large {\boxed {\bold {v_ {rms} = \sqrt {\dfrac {3RT} {Mm}}}}[/tex]
R = gas constant, T = temperature, Mm = molar mass of the gas particles
From the question
R = 8,314 J / mol K
T = temperature
Mm = molar mass, kg / mol
Molar mass of Ethane = 30 g/mol = 0.03 kg/mol
[tex]\tt v=\sqrt{\dfrac{3\times 8.314\times 473}{30} }=627.1~m/s[/tex]
b. the effusion rates of two gases = the square root of the inverse of their molar masses:
[tex]\rm \dfrac{r_1}{r_2}=\sqrt{\dfrac{M_2}{M_1} }[/tex]
M₁ = molar mass ethane =30
M₂ = molar mass hexane = 86
[tex]\tt \dfrac{r_1}{r_2}=\sqrt{\dfrac{86}{30} }=1.7[/tex]
the rate of effusion of ethane = 1.7 faster than hexane
what color is oxygen
Answer:
colourless
Explanation:
hope it helps
non polar and polar substances don't mix because of
Explanation:
The molecules in the solute and solvent are only able to make dispersion forces with each other (as they aren't both polar). This only releases very little energy. Therefore overall, more energy is required than released and hence they won't mix.
Complete this sentence: The mitochondrion is the place in the cell where ________________.
sunlight is absorbed to produce energy
cellular respiration takes place
photosynthesis takes place
energy is converted to waste
Answer:
cellular respiration takes place
Answer:
sunlight is absorbed to produce energy
Sorry if its worng
What is the symbol and number of protons in Arsenci
Answer:
As 33
Explanation:
Symbol: As
Atomic Number/ Number of Protons: 33
how many electrons does titanium have in the D orbital in its ground state electron configuration
2
3
0
1
Answer:
Your answer would be 2
Explanation:
The electron configuration for titanium is 1s22s22p63s23p63d24s2, according to the Jefferson Lab website. The element's 22 electrons are arranged in four energy levels surrounding the nucleus of the atom.
Electrons orbit the nucleus in energy levels, which are also called shells. These energy levels contain sub-shells, or orbitals, each of which holds a certain number of electrons. By looking at the electron configuration for titanium, it is possible to determine how its electrons are arranged.
There are two electrons in the s orbital of the first energy level. The second level contains eight electrons, with two in the s orbital and six in the p orbital. There are electrons in three orbitals of the third energy level. There are two in the s orbital, six in the p orbital and two in the d orbital. The fourth energy level has two electrons in its s orbital.
The study of chemicals and bonds is called chemistry.
The correct answer is 2.
The representation of electrons in the shell is called electronic configuration. The electron configuration for titanium is [tex]1s^22s^22p^63s^23p^63d^24s^2[/tex],
Electrons orbit the nucleus in energy levels, which are also called shells.
These energy levels contain as follows:-
Sub-shellsOrbitals,Each of which holds a certain number of electrons. By looking at the electron configuration for titanium, it is possible to determine how its electrons are arranged. There are two electrons in the s orbital of the first energy level. The second level contains eight electrons, with two in the s orbital and six in the p orbital.
There are electrons in three orbitals of the third energy level. There are two in the s orbital, six in the p orbital, and two in the d orbital. The fourth energy level has two electrons in its s orbital.
Hence, the correct answer is A that is 2.
For more information, refer to the link:-
https://brainly.com/question/12985618
Why does the mass of steel wool increase after getting burned? Help pls
Answer:
heat and large amount of surface area
Explanation:
the heat and surface area allows the iron in the wool to combine with oxygen. by doing this it increases the mass of the steel wool
The mass of steel wool increases after burning because it reacts with oxygen in the air, leading to the formation of iron oxide.
After burning, steel wool's bulk grows due to the oxidation process. Iron oxide, also referred to as rust, is created when steel wool burns when it comes into contact with oxygen from the air.
The steel's iron reacts chemically with the oxygen to create iron oxide, which is heavier than the original iron. As a result of going through the oxidation process and becoming iron oxide, steel wool gains bulk.
Learn more about oxidation, here:
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urgent plzz help meeee thx I HAVE EXAMEEE
Answer: [tex]2Ag^{+}(aq)+CO_3^{2-}(aq)\rightarrow Ag_2CO_3(s)[/tex]
Explanation:
Spectator ions are defined as the ions which does not get involved in a chemical equation or they are ions which are found on both the sides of the chemical reaction present in ionic form.
The given chemical equation is:
[tex]2AgF(aq)+Na_2CO_3(aq)\rightarrow Ag_2CO_3(s)+2NaF(aq)[/tex]
The complete ionic equation is;
[tex]2Ag^{+}(aq)+2F^-(aq)+2Na^+(aq)+CO_3^{2-}(aq)\rightarrow Ag_2CO_3(s)+2Na^+(aq)+2F^-(aq)[/tex]
The ions which are present on both the sides of the equation are [tex]Na^+[/tex] and [tex]F^-[/tex] and are not involved in net ionic equation.
Hence, the net ionic equation is :
[tex]2Ag^{+}(aq)+CO_3^{2-}(aq)\rightarrow Ag_2CO_3(s)[/tex]
describe how calcium may be used in the body
In case you don't know what Calcium Is:
a silver-white divalent metal, occurring combined in limestone, chalk, gypsum, etc., occurring also in vertebrates and other animals, as a component of bone, skeletal mass, shell, etc., and as a necessary element in nerve conduction, heartbeat, muscle contraction, and many other physiological functions.
Calcium can be found:
Calcium is a soft white chemical element found in bones and teeth
answer:
Using the definition..calcium may be used in the human body by nerve conduction, heartbeat, muscle contraction, and many other physiological functions.
·.•·°.hope this helped!!!·.•·°.
4. What are the PRODUCTS of the chemical reaction pictured?
+
CH4
+
202
CO2
+ 2H20
A. CHand CO2
O B. CO, and H2O
Answer:
CH4 =Methane (one atom of carbon and four atoms of hydrogen). It is a group-14 hydride and the simplest alkane and is the main constituent of natural gas.
202= Oxygen.
CO2= Carbon dioxide (one Carbon atom and two oxygen atom)
2H20= 2H2O means two molecules of water(H2O)
CH and CO2= the main difference between CO2 and CO2e is that CO2 only accounts for carbon dioxide, while CO2e accounts for carbon dioxide
CO= Carbon monoxide (CO), a colorless, odorless, and tasteless gas. Carbonyl group, composed of a carbon atom double-bonded to an oxygen atom: C=O.
H2O = water ( one hydrogen atom and two oxygen atoms)
Suppose you have 28.9 grams of elemental germanium, what mass would be the isotope germanium - 72?
34.5 grams
because the mass would multiply and do mass things
Consider the compounds Cl2, HCl, F2, NaF, and HF. Which compound has a boiling point closest to that of argon? Explain how you came up with your answer.
Answer:
Cl2, Chlorine molecule has a boiling point closest to that of argon.
This is because Chlorine is made up of discrete and simple molecules making up a simple molecular structure. The molecules associate through weak van der waal's forces of attraction hence low boiling point.
HCl has strong hydrogen bonds.
F2 is very small hence strong forces of attraction.
HF has strong hydrogen bonds
a book (m = 2 kg) is raised to a height of 1.5 m above the ground. Calculate the gravitational potential energy of the book.
Answer:
[tex]\boxed {\boxed {\sf 29.4 \ Joules }}[/tex]
Explanation:
Gravitational potential energy can be found using the following formula.
[tex]PE_g= m*g*h[/tex]
When m is the mass, g is the gravitational acceleration, and h is the height.
The book has a mass of 2 kilograms. It's height is 1.5 meters above the ground. Assuming this is on Earth, the gravitational acceleration is 9.8 m/s².
[tex]m= 2 \ kg \\h= 1.5 \ m \\g= 9.8 \ m/s^2[/tex]
Substitute the values into the formula.
[tex]PE_g=2 \ kg * 1.5 \ m * 9.8 \ m/s^2[/tex]
Multiply the first two numbers together.
[tex]PE_g=(3.0 \ kg*m)( 9.8 \ m/s^2)[/tex]
Multiply again.
[tex]PE_g=29.4 \ kg*m^2/s^2[/tex]
1 kilogram square meter per square second is equal to 1 Joule The answer we calculated is equal to 29.4 J[tex]PE_g= 29.4 \ J[/tex]
The gravitational potential energy of the book is 29.4 Joules.
Lab Report: Types of chemical reactions
Answer:
The five basic types of chemical reactions are combination, decomposition, single-replacement, double-replacement, and combustion. Analyzing the reactants and products of a given reaction will allow you to place it into one of these categories. Some reactions will fit into more than one category.
Answer:
SEE BELOW HEHEHE YOURE WELCOME
Explanation:
Types of Chemical Reactions
The purpose of this experiment was to make observations of the reactants and products and then later use this information to write a balanced chemical equation. My question before this experiment was how will the reactants affect the products. The hypothesis I made before this experiment was that based off of the materials being used, a gas will form, and so will a solid. I still do not know what the variables are in this experiment such as the independent or dependent.
The materials used in this experiment were:
Bunsen Burner
Striker
Tongs
Test Tube
Test Tube Rack
Test Tube Holder
Spatula
Sand Paper
Transfer Pipette
Tweezers
Evaporating dish
The substances used in this experiment were:
Copper wire
Sodium carbonate
Copper sulfate
Potassium iodide
Lead nitrate
Zinc
In this experiment we started off by placing about 20 drops of copper sulfate solution into a test tube and then put zinc into the test tube and watched it as single replacement occurred and zinc sulfate was the product.Next we put 10 drops of potassium iodide into another test tube and 10 drops of lead nitrate into a separate test tube. Then we added the lead nitrate into the potassium iodide and watched as double replacement occurred as lead iodide formed and potassium nitrate formed as well. Next, I sanded down a piece of 3-inch copper wire until it was shiny and watched as combustion and synthesis occurred when we held the piece of copper over a bunsen burner. Copper oxide was found formed on the wire. The other reactant in this equation was oxygen gas. After this, we used a small spatula to place about half an inch of sodium carbonate in a clean test tube and then heated the tube over the flame and watched as decomposition took place and carbon dioxide was released. The reaction was a gas formation and 2 products were formed. This was the lab experiment.
Based on this experiment and my hypothesis made beforehand, my hypothesis was almost correct other than the fact that I did not think that color change would occur so I was surprised by that. But other than that, my data did support my hypothesis showing that a gas and a solid were formed in two different ways. One error I made was when I was recording the data in a data table, I did not notice a color change at first but I rewatched the experiment. One way that I could have improved this lab investigation was pay more attention to the precise details because those make a huge difference.
How many moles of sulfur will be needed to react with 5.00 grams of aluminum?
Answer:
9584738373848838e7e8e
What is the asthenosphere?
Question 3 options:
The hot, rigid inner part of the upper mantle which can’t flow
The hot, weak inner part of the upper mantle which can flow
The hot, weak outer part of the lower mantle
None of the above
Answer:
None of the Above
Explanation:
The Athenosphere is able to flow but is also part of the UPPER LAYER meaning none of these choices are correct
In the modern periodic table, which of the following represents the last pair of elects for which Newlands' Law of Octaves would hold true?
1. AI and GA
2. AI and SI
3. NE and AR
4. MG and CA
Answer: Mg and Ca
Explanation:
In the modern periodic table, Mg and Ca are the last pair of elects for which Newlands' Law of Octaves would hold true.
Law of Octaves is the generalization that was made by Newlands. It states that when chemical elements are arranged based on their increasing atomic weight, then the ones that have the same chemical and physical properties will occur after an interval of seven elements.
In such a case, every eighth element will have identical properties when the elements in the periodic table are arranged based on their atomic masses.
Based on the above information, Magnesium (Mg) has an atomic number of 12 while Calcium (Ca) has an atomic number of 20. Therefore, the elements follow the law of Octaves as they have a difference of 8 in their atomic numbers.
Read related link on:
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Given: 36.7 grams of CaF2 is added to 300 mL water. Find molarity?
2 M
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Unit 0
Reading a Periodic TableUsing Dimensional AnalysisAqueous Solutions
Molarity = moles of solute / liters of solutionExplanation:Step 1: Define
36.7 g CaF₂
300 mL H₂O
Step 2: Identify Conversions
Molar Mass of Ca - 40.08 g/mol
Molar Mass of F - 19.00 g/mol
Molar Mass of CaF₂ - 40.08 + 2(19.00) = 78.08 g/mol
1000 mL = 1 L
Step 3: Convert
Solute
Set up: [tex]\displaystyle 36.7 \ g \ CaF_2(\frac{1 \ mol \ CaF_2}{78.08 \ g \ CaF_2})[/tex]Multiply: [tex]\displaystyle 0.470031 \ mol \ CaF_2[/tex]Solution
Set up: [tex]\displaystyle 300 \ mL \ H_2O(\frac{1 \ L \ H_2O}{1000 \ mL \ H_2O})[/tex]Multiply: [tex]\displaystyle 0.3 \ L \ H_2O[/tex]Step 4: Find Molarity
Substitute [M]: [tex]\displaystyle x \ M = \frac{0.470031 \ mol \ CaF_2}{.3 \ L \ H_2O}[/tex]Divide: [tex]\displaystyle x = 1.56677 \ M[/tex]Step 5: Check
Follow sig fig rules and round. We are given 1 sig fig as our lowest.
1.56677 M ≈ 2 M
lactic acid is produced from pyruvate by an anaerobic process called
A. protonation
B. fermentation
C. glycolysis
D. phosphorylation
Pls help me thank you
Answer:
B. fermentation
Explanation:
this process is called lactic fermentation where a molecule of gluclose(C6H12O6) is turned into two molecules of pyruvate(C3H4O3) and the pyruvate molecules are turned into lactic acid(C3H6O3) from this process two molecules of ATP are resulted
Answer:
Fermentation
Explanation: I took the test
Which of the following were conclusions based on Rutherford's gold foil experiment? Choose ALL that apply.
A) atoms contain a nucleus
B) Electrons have a mass much greater than that of protons
C) the mass and positive charge of an atom is concentrated in a small space in the center of the atom
D) most of the atom is empty space
Answer:The alpha particles that were fired at the gold foil were positively charged. ... These experiments led Rutherford to describe the atom as containing mostly empty space, with a very small, dense, positively charged nucleus at the center, which contained most of the mass of the atom, with the electrons orbiting the nucleus.
Explanation:Thomson's cathode ray experiment and Rutherford's gold foil experiment. ... that the atom is mostly empty space with a tiny, dense, positively-charged nucleus. ... mass of each particle was much, much smaller than that of any known atom. ... Why did Thomson conclude that electrons could be found in atoms of all elements?
ANSWER PLEASE LIMIT TIME !!!!
What do earth and space have alike ?
Answer:
Great question, here are a few! (╯°▽°)╯ ┻━┻
Explanation:
1. Atmosphere, The first difference between the Earth and space is the atmosphere.
2. radiation (high level of dangerous particles)!
3. gravity (weightlessness in space)
Price increases on goods in the economy signal producers to __________ production.
A.
stop
B.
increase
C.
decrease
D.
maintain
Answer:
C. decrease
Explanation:
Price increases on goods in the economy signal producers to decrease production.
Producers benefits more when the price of goods and services increases in the market. This makes them have more profit.
To maintain this profit level, they often decrease their production output to create a form of artificial scarcity within the market to sustain the price at which their goods trades.
If the producer increases the amount of goods they produce, this flux of goods can cause a decrease in price as the consumer is favored with a good bargaining power.Answer:
C
Explanation:
edge 2021
A reaction occurs in a calorimeter that heats up 15g water from 25 oC to 50 oC. The specific heat of water is 4.184 J/goC. Determine the thermal energy (Q) that must have entered the water to produce this temperature change.
The thermal energy (Q) needed : = 1882.8 J
Further explanationGiven
15g water from 25 °C to 50 °C
Required
The thermal energy (Q)
Solution
Heat can be calculated using the formula:
Q = mc∆T
Q = heat, J
m = mass, g
c = specific heat, joules / g ° C
∆T = temperature difference, ° C / K
Input the value :
Q = 15 g x 4.184 J/g°C x (50 °C- 20 °C)
Q = 1882.8 J
How can you identify an element that is a metalloid?
please helpppp!!!
A tank containing 550 mL of oxygen has a pressure of 3.5 atms. If the pressure is changed to standard atmospheric pressure, approximately 1.0 atms, what will the resulting volume be?
help!!
Answer:1925ml
Explanation:
Do not quote me on this but with boyles law in mind as pressure tends to increase the volume of the container decreases. So I believe that you would need to multiply 550ml by the 3.5atm because p1v1=p2v2 so they both end up with the same end answer and if the pressure is 1.0atm then the answer would maybe be 1925ml. since 1*1925ml =1925ml and 3.5atm*550=1925ml (there is always a possibility this is wrong though)
Answer: the picture shows work for number 1,2,4,5,7
Explanation: number 3: as the pressure in the volume decreases, the volume increases causing it to expand and eventually blow.
number 6: because the temperature and the amount of gas don’t change, these terms don’t appear in the equation. What Boyle’s law means is that the volume of a mass of gas is inversely proportional to its pressure. This linear relationship between pressure and volume means doubling the volume of a given mass of gas decreases its pressure by half.
hope this helps :))
The only way an object's speed or direction of motion can be changed is if a(n) _______ force acts on it.
A.
frictional
B.
unbalanced
C.
balanced
D.
electrical
Answer:
B. Unbalanced
Explanation:
I learned this in 8th grade.
:))) This is the right answer.
URGENT!! Can someone please explain this to me?
2CH4 + 2O2 → CO2 + 2H2O
If 7.4 moles of carbon dioxide (CO2) form at the end of the reaction, how many moles of methane (CH4) and oxygen gas (O2) entered the reaction?
__ moles of methane and __ moles of oxygen gas
Answer:
[tex]CH _{4}+ 2O _{2} → CO _{2} + 2H _{2}O[/tex]
for the balanced equation
[tex]from \: the \: equation \\ 1 \: mole \: of \: methane \: gives \: 1 \: mole \: of \: carbon \: dioxide \\ 7.4 \: moles \: of \: carbon \: dioxide \: will \: be \: given \: by \: (7.4 \times 1)moles \: of \: methane \\ = 7.4\: moles \: of \: methane \\ \\ since \: moles \: of \: oxygen \: double \: those \: of \: methane \\ moles \: of \: oxygen \: = 7.4\times 2 \\ = 14.8 \: moles \: of \: oxygen[/tex]
Which of the following processes will contribute most tot he development of soil?
A. Absorbing of sunlight by plants
B. Migration of animals
C. Evaporation of ocean water
D. Weathering of rocks
Answer:
B - migration of animals
Weathering of rocks will contribute most to the development of soil.
Weathering is the process in which rock particles are broken down into
smaller parts.
The smaller parts results in soil formation and is carried out through
physical and chemical factors.
The physical factors include:
AbrasionThermal expansionFreezing and thawing of rocksThe chemical factors include:
CarbonationAcidification etcRead more about Weathering here https://brainly.com/question/829782
Which of the following shows the correct order of the inner planets?
A: Mercury, Earth, Venus, Mars
B: Mars Mercury Venus Earth
C: Venus, Mars, Erath, Mercury
D: Mercury, Venus, Earth, Mars
Mercury, Venus, Earth,Mars
Answer:
D: Mercury, Venus, Earth, Mars
Explanation:
I NEED HELP ASAPPP PLZ
1. Heat needed = 293.25 J
2. Time to leave : 2 s
Further explanationGiven
1.5 g H2
Cp H2 = 14.27 g/J C
Δt= 13.7
Required
1. Heat needed
2. Fridge time
Solution
1. Heat can be formulated :
Q = m.c.Δt
Q = 1.5 x 14.27 x 13.7
Q = 293.25 J
2. Heat decreases = 150 J/s, so for 293.25 J :
[tex]\tt t=\dfrac{293.25~J}{150~J/s}=1.955~s\approx 2~s[/tex]
(Please help, ASAP) How many grams are in 3.45x10^23 atoms of P?
one mole of P weights about 31 grams
in one mole there are 6.022*10^23 atoms
we use the rule of threes
6.022*10^23atoms......weight..........31 grams
3.45*10^23 atoms.........weight...........x grams
x=(3.45*10^23*31)/6.022*10^23
x=106.95/6.022=17.76 grams