Answer:
diseases where microbes are the immediate cause are called infectious diseases. Infectious diseases are disorders caused by organisms — such as bacteria, viruses, fungi or parasites. Many organisms live in and on our bodies. They're normally harmless or even helpful.
Which shows that friction is undesirable?
a. Pushing furniture
b. Lighting a matchstick
c. Walking on wet floors
d. Approaching a spotlight
C. Walking on wet floors shows that Friction is undesirable
A tank of oxygen holds 20.0 L at a pressure of 15.0 atm. What is the pressure of this same gas a constant temperature if the oxygen is allowed to expand to 300.0 L?
Answer:
khate ko ban randi ko ban
How many more atoms are there in 48g of C compared with 48.6g of Mg? Explain your answer.
Answer:
The number of carbon atoms is twice the number of magnesium atoms
An acetylene tank has a volume of 390.0 L. It is stored at a temperature of 23.5 °C and has a
pressure of 1765 kPa. How many moles of acetylene are in the tank?
Considering the ideal gas law, there are 279.42 moles of acetylene in the tank.
Definition of ideal gasIdeal gases are a simplification of real gases that is done to study them more easily. It is considered to be formed by point particles, do not interact with each other and move randomly. It is also considered that the molecules of an ideal gas, in themselves, do not occupy any volume.
Ideal gas lawAn ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of gases:
P×V = n×R×T
Moles of acetyleneIn this case, you know:
P= 1765 kPa= 17.4192 atm (being 101.325 kPa= 1 atm)V= 390 Ln= ?R= 0.082 [tex]\frac{atmL}{molK}[/tex]T= 23.5 °C= 296.5 K (being 0 °C= 273 K)Replacing in the ideal gas law:
17.4192 atm× 390 L = n×0.082 [tex]\frac{atmL}{molK}[/tex]× 296.5 K
Solving:
[tex]n=\frac{17.4192 atmx 390 L}{0.082 \frac{atmL}{molK}x296.5 L}[/tex]
n= 279.42 moles
Finally, there are 279.42 moles of acetylene in the tank.
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Distinguish between the law of conservation of mass and the law of constant proportion
Why can water molecules store energy in more ways than neon atoms?
Select the correct answer.
A. Water molecules can rotate, but neon atoms cannot.
B. Water molecules can collide with other particles more than neon atoms can.
C. Water molecules can change their speed, but neon atoms cannot.
D. Water molecules can absorb heat more easily than neon atoms can.
Answer:
B . Water molecules can collide with other particles more than neon atoms can.
What is s° for b in the reaction 3 a → 2 b if ∆s°(rxn) =-277. 1 j/mol ･ k? [s° (a) = (205. 0 j/mol ･k)]
Entropy is the degree of disorder of a system. The entropy of b is 168.95 j/mol ･k.
What is entropy?The term entropy refers to the degree of disorder in a system. We have to know that the change in entropy of a system is the entropy of the product minus the entropy of the reactants.
Hence;
-277. 1 = [2(b) - 3(205. 0)
-277. 1 = 2b - 615
b= -277. 1 + 615/2
= 168.95 j/mol ･k
The entropy of b is 168.95 j/mol ･k.
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If you dispense 40 ml of hexane, but it turns out you only need 5 ml, what should you do with the remainder?
After subtracting the volume needed from the volume dispensed, we got a remainder of 35ml
Subtraction of NumbersGiven Data
Volume of Hexane dispensed = 40mlVolume needed = 5 mlLet us compute the amount of excess hexane/ the volume that will remain
Remainder = The difference in volume dispensed and the volume needed
Remainder = 40-5
Remainder = 35 ml
The remainder is 35ml
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If you dispense 40 ml of hexane, but it turns out you only need 5 ml, then we should have 35 mL of remained hexane.
How would we calculate the remaining volume?Remaining volume of any liquid will be calucted as:
Remaining Volume = Total volume - Used volume
Given that, total volume of hexane = 40 mL
Used volume of hexane = 5 mL
On putting values in above equation, we get
Remaining volume = 40 - 5 = 35 mL
Hence required value of remaining volume is 3 mL.
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Is mixing baking soda and vegetable oil a chemical change or physical change and WHY? PLEASE HELP
Answer:
chemical change i think
Explanation:
As the drops of vinegar fall through the oil to the bottom of the bottle, it reacts with the baking soda to make carbon dioxide gas. These bubbles attach themselves to the colored vinegar and cause them to float to the surface. When the bubbles pop, the color sinks back to the bottom of the bottle.
Why did mendeleev leave gaps in the periodic table?.
Answer:
Mendeleev left some gaps in his periodic table because he believed that in future more elements will be discovered.
Explanation:
"Mendeleev left gaps in his table to place elements not known at the time. By looking at the chemical properties and physical properties of the elements next to a gap, he could also predict the properties of these undiscovered elements."
How many Hydrogen atoms are there in 3NaOH?
Answer:
9 I believe
Explanation:
According to the kinetic theory of gases, an ideal gas molecule
Answer:
According to the kinetic theory of gases, in an ideal gas between two successive collisions, a gas molecule travels in a straight line.
How does the ice cube feel in your hand at first? Explain in terms of heat transfer.
In your own words.
Answer:
the ice cube feels cold
Explanation:
heat transfer is like how the sun gives us and the radiation of it put heat transfer but we dont have radiation
Calculate the kovats retention index for an unknown using the retention times 1. 6 min for ch4, 12. 8 min for octane, 15. 4 min for the unknown, and 19. 6 min for nonane
For an unknown using the retention times 1. 6 min for ch4, 12. 8 min for octane, 15. 4 min for the unknown, and 19. 6 min for nonane, the kovats retention index is mathematically given as
I = 807.857
What is Kovats retention index?Generally, the equation for the Kovats index(i) is mathematically given as
[tex]I= \frac{100[n + (N - n) x (Log tr (unknown) - logtr (n))}{ logtr(N) - logtr(n))]}[/tex]
Therefore
[tex]I= \frac{100[ 1+8*(log(14.7) -log (1.5)}{log (19.8) - log (1.5)) 0]}[/tex]
I = 100[ 1+8*(0.991/1.12)]
I = 807.857
In conclusion, Kovats retention index
I = 807.857
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Kovats retention index is a system that converts the retention time into the independent constants of the system. The Kovats retention index for the unknown is 807.857.
What is the Kovats retention index?The Kovats retention index (I) is the system used in analytical techniques like gas chromatography for the conversion of the retention time. It is given mathematically as:
[tex]\rm I = \rm \dfrac{100[n+(N-n)x(Logtr(unknown)-logtr(n))}{Logtr(N)-Logtr(n)]}[/tex]
Substituting values and solving further,
[tex]\begin{aligned} \rm I &= \rm \dfrac{100[1+8 \times (Log(14.7) - log (1.5))}{(log (19.8) - log (1.5))0}\\\\&= 100 [ 1 + 8 (\dfrac{0.991}{1.12})]\\\\&= 807.857\end{aligned}[/tex]
Therefore, the Kovats retention index for an unknown is 807.857.
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On the basis of the information below, the dissolution of FeF2(s) in acidic solution is A. thermodynamically favorable, because K2 > 1 B. thermodynamically favorable, because K3 > 1 C. not thermodynamically favorable, because K1<1 D. not thermodynamically favorable, because K3 < 1 hint (Hess's law) FeF2(s) – Fe2+(aq) + 2 F"(aq) F"(aq) + H+ (aq) 2 HF(aq) FeF2(s) + 2 H+ (aq) 2 Fe2+ (aq) + 2 HF(aq) K1 = 2 x 10-6 K2 = 1 * 103 K3 = ?
Since K3 is greater than 1, the reaction is thermodynamically favorable.
Data;
FeF2 is in an acidic solutionK2 > 1 is thermodynamically favorablek3 > 1 is not thermodynamically favorableK1<1 is not thermodynamically favorableHess LawThis states that the heat change in a given chemical reaction is the same irrespective of the number of process in which the reaction is effected.
Using Hess Law;
[tex]rxn_3 = rxn_1 * 2rxn_2\\k_3 = k_1 * k_2^2\\k_3 = 2*10^-^6 * (1*10^3)^2\\k_3 = 2[/tex]
substituting this using Gibbs law,
[tex]\delta G^0_3 = -RT\ln K_3\\\delta G^0_3 < 0[/tex]
Since K3 is greater than 1, the reaction is thermodynamically favorable.
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Lakshmi has a sample of ammonium nitrate (NH4NO3) that has a mass of 40. 10 g. She knows that the molar mass of NH4NO3 is 80. 0432 g/mol. To the correct number of significant digits, how many moles of NH4NO3 does the sample contain? 0. 50 moles 0. 500979 moles 0. 500980 moles 0. 5010 moles.
Moles are an estimation of the smallest unit of the molecules and the atoms in a sample. The moles of ammonium nitrate in a sample are 0.5010 moles.
What are moles?Moles are calculated by dividing the mass of the substance in gm by that of the molar mass in gram per mole.
Given.
Mass of ammonium nitrate = 40.10 gm
The molar mass of ammonium nitrate = 80. 0432 g/mol
Moles of ammonium nitrate are calculated as:
[tex]\begin{aligned}\rm moles &= \rm \dfrac{mass}{molar\; mass}\\\\&= \dfrac{40.10}{80.0432}\\\\&= 0.5010 \;\rm mol\end{aligned}[/tex]
Therefore, moles of ammonium nitrate present is option d. 0.5010 moles.
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How many grams of O2 are made if 2.90 moles of potassium chlorate react based on the same unbalanced equation below
Answer: 139.2 g
Explanation:
2.9 mol KClO3 (3 mol O2 / 2 mol KClO3) (32 g / 1 mol O2) = 139.2 grams :)
Answer these for 40ps
Answer:
7. H
8. F
9. G.
10. D
11. A
12. E
13. B
14. C
Determine the number of moles of air present in 1.35 l at 750 torr and 17.0°c. ideal gas law formula: pv = nrt(r = 62.396 l•torr/mol•k) which equation should you use? p equals startfraction n r t over v endfraction. n equals startfraction r t over p v endfraction. n equals startfraction p v over r t endfraction.
The number of moles of air present is 0.056 mole
What is the ideal gas equation?The ideal gas is one in which molecules do not attract or repel each other.Many gases like oxygen,nitrogen, carbon di oxide can be treated as the ideal gases as particular temperature and pressure.The real gases at high temperature and lower pressure can be treated as ideal gases.
The given data in the question is
Volume = 1.35 L
Pressure (P) = 750 torr
Temperature (T) = 17 °C = 17 + 273 = 290 K
Gas constant (R) = 62.396 L•torr/mol•K
The number of moles (n) =?
How to determine the number of moles:
The number of moles present can be obtained by using the ideal gas equation as illustrated below:
[tex]PV=nRT[/tex]
Divide both sides by RT
[tex]n=\dfrac{PV}{RT}[/tex]
[tex]n=\dfrac{(750\times 1.350}{62.396\times 290)}[/tex]
[tex]n=0.056\ moles[/tex]
Hence, the number of moles of air present is 0.056 mole
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Answer:
answer in picture
Explanation:
A radioactive nucleus emits a beta particle, then the parent and daughter nuclei are
⇢Isotones
⇢Isotopes
⇢Isomers
⇢Isobars
Answer:
isobars
Explanation:
How?
A radioactive nucleus emits beta particle(Like uranium,radium) So the mass numbers are same for daughter nuclei .They have different atomic numbes .So they are isobars
A mixture of H2 and water vapor is present in a closed vessel at 20. 00°C. The total pressure of the system is 755. 0 mmHg. The partial pressure of the water vapor 17. 50 mmHg. What is the partial pressure of H2? Type in your answer using the correct number of significant figures. MmHg.
The partial stress of H2 is 737.47 mmHg Let's observe the Ideal Gas Law to find out the whole mols.
We count on that the closed vessel has 1L of volume
P.V=n.R.TWe must convert mmHg to atm. 760 mmHg.1 atm755 mmHg (755/760) = 0.993 atm0.993 m.1L=n.0.082 L.atm/mol.K .293 K(0.993 atm 1.1L)/(0.082mol.K /L.atm).293K = n0.0413mols = nThese are the whole moles. Now we are able to know the moles of water vapor, to discover the molar fraction of it.
P.V=n.R.T760 mmHg. 1 atm17.5 mmHg (17.5 mmHg / 760 mmHg)=0.0230 atm0.0230 m.1L=n.0.082 L.atm/mol.K.293 K(0.0230atm.1L)/(0.082mol.K/L.atm .293K)=n 9.58 × 10 ^ 4 mols = n.Molar fraction = mols )f gas/general mols.Molar fraction water vapor =9.58×10^ -four mols / 0.0413 molsSum of molar fraction =11 - 9.58 × 10 ^ 4 × mols / 0.0413 ×mols = molar fraction H20.9767 = molar fraction H2H2 pressure / Total pressure =molar fraction H2H2 pressure / 55mmHg = =0.9767 0.9767 = h2 pressure =755 mmHg.737,47 mmHg.What is a mole fraction?Mole fraction is a unit of concentration, described to be identical to the variety of moles of an issue divided through the whole variety of moles of a solution. Because it's miles a ratio, mole fraction is a unitless expression.
Thus it is clear that the partial pressure of H2 is 737,47 mmHg.
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Which of the following shows a bronsted-lowry acid reacting? co no2 right arrow. co2 no nh3 h right arrow. nh4 upper c upper o subscript 3 superscript 2 minus. h right arrow. hco3– hcl h2o right arrow. h3o cl–
The reaction which shows the bronsted-lowry acid reacting is HCl + H₂O → H₃O⁺ + Cl⁻.
What is Bronsted - Lowry acid?According to the Bronsted-Lowry theory, the species which donates H⁺ ion to the solution is known as Bronsted-Lowry acid and which accepts H⁺ ion is known as Bronsted-Lowry base.
Among the given reactions, only the reaction which is showing Bronsted-Lowry acid is:
HCl + H₂O → H₃O⁺ + Cl⁻
Here HCl is a Bronsted-Lowry acid as it gives H⁺ ion in the aqueous solution.
Hence, option (3) is correct.
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A sample of aluminum chloride (AIC1z) has a mass of 37.2 g.
a. How many aluminum ions are present?
b. How many chloride ions are present?
c. What is the mass in grams of one formula unit of aluminum chloride?
The answers to your questions are as follows
A) The number of aluminium ions present = 1.62 * 10²³ ions
B) The number of chloride ions present = 9.86 * 10²³ ions
C) The mass of one unit of aluminium chloride = 133.34 grams
Given data :
mass of aluminium chloride = 37.2 g
molar mass of aluminium chloride = 133.34 g/mol
note : I mole of a molecule has 6 * 10²³ molecules
Number of moles = mass / molar mass = 0.27 moles
Determine the number of aluminum ions and chloride ions presentA) aluminium ions present
moles of AlCl₃ * 6 * 10²³
= 0.27 * 6 * 10²³ = 1.62 * 10²³ ions
B) Chloride ions present
moles of AlCl₃ * 6 * 10²³ * 3
= 0.27 * 6 * 10²³ * 3
= 4.86 * 10²³ ions
C) The mass of one formula unit of aluminium chloride = 133.34 grams
Hence we can conclude that the answers to your question are as listed above.
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In the reaction _Al 3O2→2Al2O3, what coefficient should be placed in front of the Al to balance the reaction? 1 2 3 4.
Answer:
D.) 4
Explanation:
Al + 3 O₂ --> 2 Al₂O₃
In the equation, there are:
Reactants: 1 Al and 6 O
Products: 4 Al and 6 O
To determine how many atoms there are of each, you multiply the coefficients by the subscripts attached to the atoms. While the question doesn't ask, as you can see, the oxygen atoms are balanced because there is an equal amount on both sides. To balance the aluminum atoms, you can get 4 aluminum atoms on the reactants side by using a coefficient of 4.
The new equation would look this this:
4 Al + 3 O₂ --> 2 Al₂O₃
There are now:
Reactants: 4 Al and 6 O
Products: 4 Al and 6 O
Please help-
Answer:
you are not posted question
if you are a form of an alto cloud, where in the troposphere would you be located? high middle or low
Answer:
These clouds extend through the lower and mid-layers of the troposphere bringing rain to the surface below.
Explanation:
The bases of clouds in the middle level of the troposphere, given the prefix “alto,”
Arrange the following bonds in order of increasing ionic character. assign number 1 as the highest and 6 as the lowest. a. carbon-hydrogen
b. fluorine-hydrogen
c. bromine-hydrogen
d. sodium-chlorine
e. potassium-fluorine
f. lithium-chlorine
Hikers noticed that a sealed bag of potato chips puffs up when taken to the top of a mountain. Suppose that at the valley floor below, the air pressure is 1. 0 atm, the temperature is 25°C, and the volume of the bag is 0. 985 L. At the top of the mountain, the temperature is 22°C and the bag has puffed up to 1. 030 L. What is the air pressure on top of the mountain? Type in your answer using the correct number of significant figures. Formula: P1V1 T1 = P2V2 T2 atm.
The final pressure or the air pressure on the top of the mountain is 0.818.
What is air pressure?Air pressure is the pressure exerted by air in the atmosphere of the earth.
By the Gas law
[tex]\dfrac{P_1V_1}{ T1} =\dfrac{ P_2V_2 }{T_2}[/tex]
Given, the pressure of the valley floor is 1 atm. = P1
The temperature is 25° C = T1
The volume of the bag is 0.985 L. = V1
The temperature at the top of the mountain is ° C = T2
Now, the volume of the bag is 1. 030 L = V2
To find P2
Put the values in the formula
[tex]\dfrac{1 atm \times0.985 L}{ 25} =\dfrac{ P_2 \times 1. 030 L }{22}\\\\0.03832 = 0.0468 \times P_2\\\\P_2= 0.818[/tex]
Thus, the final pressure is 0.818.
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Issue like gay marriage, abortion, and education have caused debate over the constitution because of the issue of what? (Hint: federalism)
Suppose a researcher wanted to extract as much zinc ion as possible from solution a without any copper (ii) impurity. How many milliliters of solution b should the researcher add to solution a?
The extraction of metal usually makes use of the method of precipitation in which a reagent is added which is able to precipitate the required metal in its pure form without impurities.
What is extraction?The process of extraction has to do with the removal of a substance from another. It is usually the way that pure substances are obtained in chemistry. The question is incomplete but I will try to give a general idea.
The extraction of metal usually makes use of the method of precipitation in which a reagent is added which is able to precipitate the required metal in its pure form without impurities. We can not make numerica;l calculatiosn as the values are missing.
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