Answer:
A
Explanation:
Cohesion is basically the attraction of same molecules and surface tension occurs due to the attraction of molecules . Therefore as cohesion becomes high, surface tension becomes here. We can say then that Cohesion is directly proportional to surface tension
Water can keep engines operating at low temperatures. Which property of water most likely gives it this ability?
A. it boils at around 100°C
B. it has a high heat capacity
C. it is a good lubricant
D. it can change from water to ice
Answer:
B: it has a high heat capacity
Explanation:
When any material has a high specific heat capacity/ heat capacity, it doesn't heat or cool very fast. So water can absorb more heat from the engine and can keep the engine cool or at low temperature for a longer period of time.
Which of the following examples best represents heat?
1. A sample of platinum is 76°C.
2. A piece of plastic contains 57 J of energy.
3. A piece of wood burns at 350°C.
4. A toy car generates 45 J of kinetic energy.
Answer:
What I think it is it's.. 3?
calculate the amount of hydrogen sulphide that would be liberated by the action of sulphuric acid on 4.4 gram of ferrous sulphide. (Fe=56;S=32)
You will get iron sulfate and hydrogen sulfide gas (a.k.a. rotten egg gas).
FeS + H2SO4 = FeSO4 + H2S(g)
Change in Free Energy: ΔG(20C) = -66.6kJ (negative, so the reaction runs)
Change in Enthalpy: ΔH(20C) = -37.3kJ (negative, so the reaction is exothermic)
We'll begin by writing the balanced equation for the reaction between ferrous sulphide (FeS) and sulphuric acid (H₂SO₄). This is illustrated below:
FeS + H₂SO₄ —> H₂S + FeSO₄
Next, we shall determine the mass of FeS that reacted and the mass of H₂S produced from the balanced equation. This is illustrated below:
Molar mass of FeS = 56 + 32
= 88 g/mol
Mass of FeS from the balanced equation = 1 × 88 = 88g
Molar mass of H₂S = (2×1) + 32
= 2 + 32
= 34 g/mol
Mass of H₂S from the balanced equation = 1 × 34 = 34 g
SUMMARYFrom the balanced equation above,
88 g of FeS reacted to produce 34 g of H₂S.
Finally, we shall determine the mass of H₂S produced by the reaction of 4.4 g of FeS. This can be obtained as follow:
From the balanced equation above,
88 g of FeS reacted to produce 34 g of H₂S.
Therefore, 4.4 g of FeS will react to produce = (4.4 × 34)/88 = 1.7 g of H₂S.
Thus, 1.7 g of H₂S were obtained from the reaction.
Learn more: https://brainly.com/question/23115234
112 g of aluminum carbide react with 174 g water to produce methane and aluminum hydroxide in the reaction shown below.
2 Al4C3(s) + 12 H2O(l) → 3 CH4(g) + 4 Al(OH)3(s)
If aluminum carbide is the limiting reactant, how many moles of the excess reactant are left over
a
37.3 mol
b
4.68 mol
c
7.33 mol
d
131.94 mol
Answer: 4.999 moles of excess reactant will be left over.
Explanation:
Limiting reagent is defined as the reagent which is completely consumed in the reaction and limits the formation of the product.
Excess reagent is defined as the reagent which is left behind after the completion of the reaction.
The number of moles is defined as the ratio of the mass of a substance to its molar mass.
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] .....(1)
Given mass of aluminium carbide = 112 g
Molar mass of aluminium carbide = 143.96 g/mol
Putting values in equation 1:
[tex]\text{Moles of aluminium carbide}=\frac{112g}{143.96g/mol}=0.778mol[/tex]
For the given chemical reaction:
[tex]2Al_4C_3(s)+12H_2O(l)\rightarrow 3CH_4(g)+4Al(OH)_3(s)[/tex]
By the stoichiometry of the reaction:
2 moles of aluminium carbide reacts with 12 moles of water
So, 0.778 moles of aluminium carbide will react with = [tex]\frac{12}{2}\times 0.778=4.668 mol[/tex] of water
Given mass of water = 174 g
Molar mass of water = 18 g/mol
Putting values in equation 1:
[tex]\text{Moles of water}=\frac{174g}{18g/mol}=9.667mol[/tex]
Moles of excess reactant (water) left = 9.667 - 4.668 = 4.999 moles
Hence, 4.999 moles of excess reactant will be left over.
Need help with some chem equations
1. While diving under 3.7 atm of pressure, a gas bubble of 25 mL was found when release at surface at 1 at how big did the bubble get
2. a blue 3 L balloon at 25c was moved to a temperature of 38c what is new volume
3. 1.72 L of gas at STP was transferred to a new container with temps 18c and volume of 3.1 L what is new pressure
Answer:
1. 92.5 ml
2. 3.13 L
3. 524.48 K
Explanation:
1. Using Boyle's law equation:
P1V1 = P2V2
Where;
P1 = initial pressure (atm)
V1 = initial volume (ml)
V2 = final volume (ml)
P2 = final pressure (atm)
Based on the information in question 1: P1 = 3.7atm, P2 = 1atm, V1 = 25 mL, V2 = ?
3.7 × 25 = 1 × V2
92.5 = V2
V2 = 92.5ml
2. Using Charles law equation as follows:
V1/T1 = V2/T2
Where;
V1 = initial volume (L)
V2 = final volume (L)
T1 = initial temperature (K)
T2 = final temperature (K)
Based on the information provided: V1 = 3L, V2 = ?, T1 = 25°C = 25 +273 = 298K, T2 = 38°C = 38 + 273 = 311K
3/298 = V2/311
Cross multiply
298 × V2 = 3 × 311
298V2 = 933
V2 = 933 ÷ 298
V2 = 3.13L
3. Using Charles law equation as follows:
V1/T1 = V2/T2
Where;
V1 = initial volume (L)
V2 = final volume (L)
T1 = initial temperature (K)
T2 = final temperature (K)
Based on the information provided; V1 = 1.72 L, T1 = 18°C = 18 + 273 = 291K, T2 = ?, V2 = 3.1L
1.72/291 = 3.1/T2
Cross multiply
1.72 × T2 = 291 × 3.1
1.72T2 = 902.1
T2 = 902.1 ÷ 1.72
T2 = 524.48K
El petróleo crudo, es decir, en estado natural,
se encuentra embebido en las rocas porosas de
la corteza terrestre, semejante al agua en una
esponja, y no a manera de lagos subterráneos,
como se cree. Por lo general, el pozo petrolero
contiene en su parte superior una gran masa de
gas. Responde:
a) ¿Qué precauciones se deben tener en la explo-
tación del petróleo?
b) ¿Cuál es el impacto ambiental de la explotación
del petróleo?
c) ¿Qué compromisos debe cumplir una em-
presa que explota el petróleo en relación con el
medio ambiente?
Which of the following steps correctly converts 3 moles of fluorine to an equivalent number of particles of fluorine?
Group of answer choices
Divide Avogadro's number by 3.
Multiply 3 by Avogadro's number.
Multiply 3 by the atomic mass of fluorine.
Divide the atomic mass of fluorine by 3.
Answer:
B) Multiply 3 by Avogadro's number
Explanation:
This is according to Study.com
3 moles of fluorine contains 18.066✖10²³ Particles. thus, option B is correct
How many are there no. of particles in 1mole?One mole contains 6.022✖10²³ particles.
3 moles of flourine contains 3✖6.022✖10²³ particles
Hence, option “B” is correct
learn more about moles.
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The element in group 14, period 3 of the periodic table is classified as a?
1. Metal
2. Noble gas
3. Metalloid
4. nonmetal
Answer:
It's a Metalloid
Explanation:
How do I calculate the pOH of a Solution at 25℃ with a [OH-1] = 6.5 x 10-9 M and state whether the Solution is Acidic, Basic, or Neutral?
Answer:
pOH = 8.19
Acidic solution (pH < 7.0)
Explanation:
The pOH of the solution is defined as:
pOH = - log [OH⁻]
Since we have [OH⁻] = 6.5 x 10⁻⁹ M, we calculate the pOH as follows:
pOH = - log (6.5 x 10⁻⁹) = 8.19
To know if the solution is acidic, neutral or basic, we have to calculate the pH from the value of pOH:
pH + pOH = 14
⇒ pH = 14 - pOH = 14 - 8.19 = 5.81
The solution is acidic because pH < 7.0.
The pressure of a certain amount of gas in a 1.25 L balloon is 760 torr. What would the pressure of that balloon be if it's volume was increased to 2.15 L?
440 torr
General Formulas and Concepts:Chemistry
Ideal Gas Law
Boyle's Law: P₁V₁ = P₂V₂
P₁ is pressureV₁ is volumeP₂ is new pressureV₂ is new volumeMath
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightEquality Properties
Multiplication Property of Equality Division Property of Equality Addition Property of Equality Subtraction Property of Equality Explanation:Step 1: Define
Identify
[Given] V₁ = 1.25 L
[Given] P₁ = 760 torr
[Given] V₂ = 2.15 L
[Solve] P₂
Step 2: Solve for P₂
Substitute in variables [Boyle's Law]: (760 torr)(1.25 L) = P₂(2.15 L)Multiply: 950 torr · L = P₂(2.15 L)[Division Property of Equality] Divide 2.15 L on both sides: 441.86 torr = P₂Rewrite: P₂ = 441.86 torrStep 3: Check
Follow sig fig rules and round. We are given 2 sig figs as our lowest.
441.86 torr ≈ 440 torr
Gas particles that are at low temperature and high pressure and are close to changing phases are considered:
a)Real Gases
b)Ideal Gases
c)Both Ideal and Real Gases
Please help me I will give brainliest to the first correct answer
Answer:
OPTIC B) HEPT-HOPE IT IS HELPFUL
Please choose a claim and then answer the question below please ty I would appreciate it!
Answer:
Claim 1
Explanation:
I chose this claim because I believe that when the plates under the earth move or shift, that's what causes an earthquake and when everything starts to shake. If it was the other way around there wouldn't be any reason for an earthquake to start.
hope that helped :)
Answer:
Plates move, which can cause earthquakes.
Explanation:
Tectonic plates are always slowly moving, however sometimes they can "lock" together, creating pressure and build up. The release of this energy results in a Tectonic earthquake. Therefore, the movement of plates causes earthquakes.
Select all examples that apply as a physical changes in properties (please help)
Can someone please help, 20 points
Draw 3-ethyl-2,4-dimethyl octanoic acid
3-ethyl-2.4-dimethyl-octanoic acid
Help needed ASAP, I will mark your answer as brainliest.
Examine the food chain below: In this specific food chain, the _______ eats plants for food. A. caterpillar B. sunshine C. bobcat D. leaf
What is the molar it's of a solution that has 0.080 moles of calcium chloride dissolved in 850mL of solution.
Answer:
The molarity of the solution is 0.094 [tex]\frac{moles}{liter}[/tex]
Explanation:
Molarity is a measure of the concentration of that substance and is defined as the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution:
[tex]Molarity=\frac{number of moles of solute}{volume}[/tex]
Molarity is expressed in units[tex]\frac{moles}{liter}[/tex].
In this case:
number of moles of solute: 0.080 molesvolume= 850 mL= 0.850 LReplacing:
[tex]Molarity=\frac{0.080 moles}{0.850 L}[/tex]
Solving:
Molarity= 0.094 [tex]\frac{moles}{liter}[/tex]
The molarity of the solution is 0.094 [tex]\frac{moles}{liter}[/tex]
A gas has a pressure of 6.5 atm at 540 K. What will the pressure be at 210 K if the volume does not change
Answer:
The pressure at 210 K will be 2.53 atm.
Explanation:
Gay-Lussac's law indicates that, as long as the volume of the container containing the gas is constant, as the temperature increases, the gas molecules move faster. Then the number of collisions with the walls increases, that is, the pressure increases. That is, the pressure of the gas is directly proportional to its temperature.
This law mathematically indicates that the quotient between pressure and temperature is constant:
[tex]\frac{P}{T} =k[/tex]
You want to study two different states, an initial state and a final state. You have a gas that is at a pressure P1 and at a temperature T1 at the beginning of the experiment. By varying the temperature to a new value T2, then the pressure will change to P2, and the following will be fulfilled:
[tex]\frac{P1}{T1} =\frac{P2}{T2}[/tex]
In this case:
P1= 6.5 atmT1= 540 KP2= ?T2= 210 KReplacing:
[tex]\frac{6.5 atm}{540 K} =\frac{P2}{210 K}[/tex]
Solving:
[tex]P2=210 K*\frac{6.5 atm}{540 K}[/tex]
P2=2.53 atm
The pressure at 210 K will be 2.53 atm.
Acceleration is inversely proportional to the:
Force
Mass
Depends on the acceleration given
Giving brainlist on this one
I would be grateful!
Answer:
Explanation:
acceleration is inversely proportional to the mass of an object.
Newton's second law states that "the acceleration produced on a body is directly proportional to the resultant force anf inversely proportional to its mass".
20. In which medium do sound waves move the fastest?
A gases
B liquids
C water vapor
D solids
Answer:
D. Solids
Explanation:
Answer:
B
Explanation:
When water evaporate, it moves faster
Determine the mass of NaCl needed to create a 500. ml solution with a concentration of 1.50 M.
How many questions would you need to separate ten arthropods into different branches
Answer:
10.
Explanation:
We need 10 question to separate ten arthropods into different branches because each arthropod belongs to separate branch and each branch needs explanation. Phylum Arthropoda is considered as the largest phylum in the animal world, and insects form the largest class within this phylum due to its highest number of individual or organisms. Each arthropods are different from one another so they needs more questions to separate them from each other.
Can someone please help
Answer:the third one
Explanation:
High levels and long periods of stress can increase a person’s risk for many diseases.
True
False
Answer:
true
Explanation:
What are proteins made up of?
Answer:
cereal egg fish
that's a ll I know
how many moles are in 0.14g of Nitrogen, N2?
Answer:
0.01 moles
Explanation:
14 g contains 1 mole
0.14g contains> (0.14*1)/14
= 0.01 moles
when chlorine gas is passed through potassium Bromide solution Potassium Chloride and bromine are formed which is a more reactive non metal bromine or chlorine
[tex] \boxed{\boxed{\huge{ \mathbf{ \underline{ Answer} \: \: ✓ }}}}[/tex]
In a displacement reaction, more reactive element displaces less reactive element from its compound and from the above reaction we observed that, Chlorine displaces bromine from its compound (KBr) to form Potassium chloride (KCl), therefore Chlorine is more reactive non - metal.
The equation for above reaction is :
[tex] \large\boxed {\mathrm{2KBr + Cl_2 \rightarrow 2KCl + Br_2}}[/tex]
_____________________________
[tex]\mathrm{ ☠ \: TeeNForeveR \:☠ }[/tex]
Which of the following must be
TRUE if a solution is to be
considered acidic?
A. [H^+] < [OH)
B. [H^+] > [OH ]
C. KW= [H^+] /[OH]
D. [H^+] =[OH)
Answer:
c
Explanation:
kw=h+bls
Given the balanced equation and the equilibrium concentrations shown:
N2 + 3H2=>2NH3
Equilibrium Concentrations:
N2: 9.76 M
H2: 6.52 M
NH3: 8.62 M
What is the value of K?
Answer:
K= 0.0275
Explanation:
The K of a reaction is defined as the ratio between the concentration of products over concentration of reactants powered to its coefficient. In the reaction of the problem, K is:
K = [NH3]² / [N2] [H2]³
Replacing the concentrations in K:
K = [8.62M]² / [9.76M] [6.52M]³
K= 0.0275Answer:
The value of K is 0.027.
Explanation:
Chemical equilibrium is a state of a reversible chemical system in which no changes are observed as time passes, despite the fact that the substances present continue to react with each other. That is, the chemical equilibrium is established when there are two opposite reactions that take place simultaneously at the same speed.
The Law of Mass Action says that the product of the equilibrium concentrations of the products raised to their respective stoichiometric coefficients, divided by the product of the concentrations of the reactants in the equilibrium raised to their respective stoichiometric coefficients, is a constant for each temperature, called the equilibrium constant Kc. So, being:
aA + bB ⇄ cC + dD
Then: [tex]Kc=\frac{[C]^{c} *[D]^{d} }{[A]^{a} *[B]^{b} }[/tex]
In this case, the reaction is:
N₂ + 3 H₂ ⇒ 2 NH₃
So, the equilibrium constant is:
[tex]Kc=\frac{[NH_{3} ]^{2} }{[N_{2} ]*[H_{2} ]^{3} }[/tex]
Being:
[N₂] = 9.76 [H₂] = 6.52 [NH₃]= 8.62Replacing:
[tex]Kc=\frac{8.62^{2} }{9.76*6.52^{3} }[/tex]
Solving
Kc= 0.027
The value of K is 0.027.