Answer:
A.
Explanation:
The melting of wax is just a physical change, not a chemical one, since melted wax can still reharden and go back to its original state. All the other choices are non-reversible, chemical changes.
Hopefully this helps- let me know if you have any questions!
Answer:
Melting of candle wax when heated
Explanation:
So what's the difference
Physical reaction is reversibleChemical reaction is irreversibleWe can get candle wax back when we melted it so it's physical reaction
According to Avogadro's law, how will the number of molecules in 2 liters of hydrogen gas compare with the number of molecules in 2 liters of oxygen gas at the same temperature and pressure?
Answer:
Both will be the same
Do refer to the calculation above, hopefully it matches your answer.
8. What is the pressure in atm inside a 3.00 L ball that contains 1.23 moles of air at 32 degrees C?
Answer:
P = 10.3 atmExplanation:
n = 1.23
V = 3.00 L
T = 32C = 305.15K
P = ?
Follow this equation below
PV = nRTP x 3.00 = 1.23 x 0.08206 x 305.15K
P x 3.00 = 30.8
Dividing both sides by 3.00
P = 10.3 atm
Hope this helps!!
The pressure inside a 3.00 L ball that contains 1.23 moles of air at 32 degrees C is 10.25 atm.
How do we calculate the pressure?Pressure of gas will be calculated by using the ideal gas equation as:
PV = nRT, where
P = pressure = ?V = volume = 3Ln = moles = 1.23 molR = universal gas constant = 0.082 L.atm/K.molT = temperature = 32 degrees C = 305 KOn putting all values, we get
P = (1.23)(0.082)(305) / (3) = 10.25 atm
Hence required pressure is 10.25 atm.
To know more about ideal gas equation, visit the below link:
https://brainly.com/question/12873752
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The pOH of a solution is 6. 0. Which statement is correct? Use p O H equals negative logarithm StartBracket upper O upper H superscript minus EndBracket. And p H plus P O H equals 14. The pH of the solution is 20. 0. The concentration of OH– ions is 1. 0 times 10 to the negative 8 moles per liter. The concentration of OH– ions is 1. 0 times 10 to the 6 moles per liter. The pH of the solution is 8. 0.
The pOH of a solution is 6, then the pH of the solution is 8 moles per liter.
What is pOH?pOH of any solution defines as the negative logarithm of the concentration of hydroxide ions (OH⁻).
In the question given that,
pOH of the solution = 6
i.e. -log[OH⁻] = 6
[OH⁻] = 10⁻⁶
Also we know that, pH + pOH = 14
pH = 14 - 6 = 8 mol/L
Hence, pH of the solution is 8 mol/L.
To know more about pH & pOH, visit the below link:
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This system has an equilibrium constant of 50. 5 at 448°C: H2(g) I2(g) ↔ 2HI(g). What is the reaction quotient, Q, for this system when [H2] = 0. 200 M, [I2] = 0. 100 M, and [HI] = 3. 00 M?.
Considering the definition of Q, the reaction quotient Q has a value of 450.
Definition of QThe reaction quotient Q is a measure of the relative amount of products and reactants present in a reaction at a given time when a reaction has not yet reached equilibrium.
For the reaction aA + bB ⇄ cC + dD, Q adopts the expression:
[tex]Q=\frac{[C]^{c}[D]^{d} }{[A]^{a} [B]^{b} }[/tex]
That is, Q is defined as the ratio between the equilibrium concentrations of products and reactants raised to their respective stoichiometric coefficients, at a given temperature.
Comparison between Q and KcComparing Q with Kc allows us to find out the state and evolution of the system:
If the reaction quotient equals the equilibrium constant, Q = Kc, the system has reached chemical equilibrium.If the reaction quotient is greater than the equilibrium constant, Q > Kc, the system is not in equilibrium. In this case the forward reaction predominates and there will be more product present than is obtained at equilibrium. Therefore, that product is used to favor the reverse reaction and reach equilibrium. Then the system will evolve to the left to increase the concentration of reactants.If the reaction quotient is less than the equilibrium constant, Q < Kc, the system is not in equilibrium. The concentration of the reactants is higher than it would be at equilibrium, so the forward reaction predominates. Thus, the system will evolve to the right to increase the concentration of products.Q for this systemIn this case the system is:
H₂(g) + I₂(g) ↔ 2 HI(g)
So, Q adopts the expression:
[tex]Q=\frac{[HI]^{2} }{[H_{2} ] [I_{2} ] }[/tex]
You know:
[H₂] = 0. 200 M[I₂] = 0. 100 M[HI] = 3. 00 MReplacing in the expression of Q:
[tex]Q=\frac{(3 M)^{2} }{(0.2 M) (0.1 M)}[/tex]
Solving:
[tex]Q=\frac{9 M^{2} }{0.02 M^{2} }[/tex]
Q= 450
Finally, the reaction quotient Q has a value of 450.
In this case, the reaction quotient is greater than the equilibrium constant, Q > Kc. Then, the system is not in equilibrium. The forward reaction predominates and the system will evolve to the left to increase the concentration of reactants.
Learn more about reaction quotient Q:
https://brainly.com/question/26610333
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In winter, soap does not dissolve properly in water.
Answer:
because of nothing...............................
A piece of sodium metal is added to a beaker of water. One of the products is hydrogen gas. Name the other product. Give the full name, not the symbol.
Answer:
Sodium Hydroxide!
Explanation:
When a metal combines with water, metal hydroxide is formed, as well as hydrogen gas.The equation in which the total number of individual atoms on the reactant side equals the total number of individual atoms on the product side is known as a balanced chemical equation.For the reaction of sodium metal with water, a balanced chemical equation is as follows: 2 Na +2 H20 ---> H2 + 2 NAOH- The equation above is balanced.
By Stoichiometry of the reaction:2 moles of sodium metal reacts with 2 moles of water to produce 2 moles of sodium hydroxide and 1 mole of hydrogen gasHence, the other product in the given reaction is sodium hydroxide
Which of the following laboratory equipment is used to provide heat?
a
b
Google
Answer:
A sun
Explanation:
sunThe core of the sun is so hot and there is so much pressure, nuclear fusion takes place: hydrogen is changed to helium. Nuclear fusion creates heat.
Espresso Coffee House is designing a coffee mug that keeps liquids hot. The research department tested several different materials for their ability to keep a normal-sized cup of coffee hot the longest amount of time. The testing room temperature is approximately 25 degrees Celsius. Write a scientific explanation to justify the selection of material, A, B, or C, used to create the cup that would keep the coffee the hottest for the longest period of time.
Answer:
This question is incomplete
Explanation:
This question is incomplete because the result of the described experiment would have better determined the type of scientific explanation to profer. However, the type of material that will preserve the relative hotness or temperature of the hot coffee for the longest time will be a material than can resist heat transfer. These materials tend to keep hot substances hot by not allowing the heat of the coffee to be conducted or pass through it. These materials are mostly insulators or made by placing an insulator between two heat conductors.
Generally, heat is usually transferred from a region of higher concentration to a region of lower concentration, hence when the heat is denied of this transfer, the heat will remain trapped in the "heat-donor" substance (in this case the hot coffee). Thus, the material chosen (A, B or C) will be the material that resists heat transfer the most based on the explanation above.
Help me please I need to write the number of atoms
A gas at constant volume has a pressure of 2. 80 atm at 400. K. What will be the pressure of the gas at 360. K? 2. 52 atm 2. 94 atm 3. 11 atm 3. 78 atm.
Answer:
2.52atm for sure
Explanation:
We know that:
P1= 2.80atm
T1= 400k
T2= 360k
And we want to find P2= ?
We have an equation: P1/T1 = P2/T2
Multiple both side by T2 to remove it
P2 = 2.52
A balloon containing 0.040 mol of a gas with a volume of 5.0 ml was expanded to 1.0 l. which equation should you use to find the amount of gas added? v subscript 2 equals startfraction v subscript 1 n subscript 2 over n subscript 1 endfraction. n subscript 2 equals startfraction v subscript 2 n subscript 1 over v subscript 1 endfraction. n subscript 2 equals startfraction v subscript 1 n subscript 1 over v subscript 2 endfraction.
P, R, and T are constant, then the volume is directly proportional to the mole. Then the correct option is A.
What is an ideal gas equation?An ideal gas is a theoretical composed of a set of randomly moving gas particles that interacts only through elastic collision.
Given
A balloon containing 0.040 mol of a gas with a volume of 5.0 mL was expanded to 1.0 L.
[tex]V_1=5\ ml[/tex]
[tex]V_2=1000\ ml[/tex]
[tex]n_1=0.040\ mole[/tex]
We know the equation of the ideal gas.
[tex]PV=nRT[/tex]
where P, R, and T are the constant, then
[tex]\dfrac{V_2}{V_1}=\dfrac{n_2}{n_1}[/tex]
[tex]V_2=n_2\times \dfrac{V_1}{n_1}[/tex]
Thus, the correct option is A.
More about the ideal gas equation link is given below.
brainly.com/question/1056445
Answer:
answer in picture
Explanation:
What does it mean when a rock is foliated?
Answer:
(Foliated means the parallel arrangement of certain mineral grains that gives the rock a striped appearance.) Foliation forms when pressure squeezes the flat or elongate minerals within a rock so they become aligned.
Write the electron configuration for Silicon
Answer:
Si₁₄ = 1s² 2s² 2p⁶ 3s² 3p²
Explanation:
Silicon is present in group 14 of periodic table.
It is blue-gray color metalloid.
Its atomic mass is 28 g/mol.
It is mostly used to make allow.
The most important alloy are Al-Si and Fe-Si. These are used to make different machine tools, transformer plates, engine etc.
Its atomic number is 14 and electronic configuration can be written as,
Electronic configuration:
Si₁₄ = 1s² 2s² 2p⁶ 3s² 3p²
The noble gas electronic configuration or abbreviated electronic configuration can also be written.
Si₁₄ = [Ne] 3s² 3p²
The atomic number of neon is 10. Its electronic configuration is,
Ne₁₀ = 1s² 2s² 2p⁶
That's why we write [Ne] for 1s² 2s² 2p⁶ in abbreviated electronic configuration of Si.
Show work
1a. In a reaction between the elements aluminum and chlorine, aluminum chloride is produced. Write the balanced chemical equation.
1b.If 2.00 moles of Al react with Cl2 according to the above equation, how many grams of AlCl3 will form?
Answer:
Explanation:
Part A
2 Al + 3 Cl_2 ==> 2 AlC_3
Part B
The balanced equation tells you for every 2 mols of Al you will produce 2 mols of AlCl_3
Find the mass of 1 mol of AlCl_3
Mass Al = 27
Mass 3Cl = 3*35.5 = 106.5 Add
Mass 1 mol AlCl_3 = 133.5
Answer: 2 mols of AlCl_2 = 267.0 grams
according to newtons law of universal gravitation, how are gravitational force and the distance between objects related
Answer:
they are inversly related
Explanation:
As the force increases distance decreases .They are related with an equation
F= Gm1×m2/r^2
what is the frequency of radio
Question
Answer
Explanation
Radio Frequency Is one of the electromagnetic frequency waves that lie in the range stretching from below 3 kilohertz to around 300 gigahertz and which includes the frequencies used for communication signals (such as for radio and television broadcasting and cellular telephone and satellite transmissions)
I hope this helps
How do the forces compare when different objects collide?
Answer:Newton's third law of motion is naturally applied to collisions between two objects. In a collision between two objects, both objects experience forces that are equal in magnitude and opposite in direction. Such forces often cause one object to speed up (gain momentum) and the other object to slow down (lose momentum
Explanation:
Arrange Zn, Br, Fe, K, Na in order of increasing size
please help ASAP !!
Answer:
Na, K, Fe, Zn, Br,
Explanation:
look at periodic table. size increases left to right and from top to bottom.
which of the following is a chemical property of aluminum
a}the melting point of aluminum 660 degrees Celsius
b}the boiling point of aluminum is 2519 degrees Celsius
c}aluminum does not dissolve in water
d} aluminum reacts with oxygen
Answer:
I think it’s b
Explanation:
The boiling point of aluminum is 2519 degrees Celsius ( hope this helps! )
What's the meaning of the word "distilled"?
Thanks :)
Answer:
Dictionary definition below
Explanation:
"(of a liquid) having been purified by undergoing heating and condensation."
Hope this helps :)
Answer:
of a liquid because i just know please dont question my intelligence
Explain The difference in motion of Atom in the following states of matter solid liquid and gas which of the states has the slower moving atom and which one has the fastest
Answer:
the difference in the motion of molecules in an atom when its in the solid, liquid and gas state is that they move slower or faster dependant on which state they are in, solids having the slowest moving particles and gasses having the fastest moving particles
The speed of a cheetah running across the tundra is 27 m/s. The length of the tundra is 2,430 meters. How long did it take the cheetah to run across the tundra?
Answer:
90
Explanation:
because i ansered this before
Can somebody plz answer these 3 questions correct
(WILL MARK AS BRAINLIEST) promise :)
thankssss
Answer: Basilosaurus is a prehistoric whale which lived approximately 40 million to 34 million years ago during the Late Eocene Period.
Explanation:
Answer:
11. I think the answer is, Both humans and whale embryos have a tail and a backbone (I'm not sure).
12. Basilosaurid, any member of the family Basilosauridae, an early group of whales that lived from the middle Eocene to the late Oligocene Epoch (about 41 million to 23 million years ago).
13. Protocetids had long snouts, large eyes, and their nasal opening was farther caudally than in earlier archaeocetes.
Hope this helps! :D
How many more electrons does sodium want according to the Octet rule?
What is the steric number of H2O2?
Answer: 1(2)+6(2)=14
Explanation:
Not sure, but maybe.
What type of bond is Ca + Ar?
a. neither
b. ionic
c. covalent
d. metallic
Answer:
c
Explanation:
QUESTION :WHAT TYPE OF BOND IS CA + AR
ANSWER :
C .
COVALENT.
HOPE IT HELP
THANK ME LATER.
Which of the following trends is/are correct when you move
down the halogen group?
a Decreasing electronegativity
b Decreasing reactivity
C Increasing melting and boiling points
d All of the above
Answer: it’s d all of the above
Explanation:
Which of the following are negative consequences of cobalt mining in the Democratic Republic of Congo? Select the two correct answers.(1 point)
Thousands of children work in cobalt mines.
Increased cobalt mining causes a decrease in gold mining.
Dust from cobalt mines causes lung and skin damage.
The demand for cobalt is expected to double in the next 10 years.
Cobalt is sent to processing plants overseas.
Some of the negative consequences of cobalt mining are pollution and child trafficking.
Effects of cobalt miningMany young children are made to work in mines generally either due to continued struggle for survival or forced into it by child traffickers.
Apart from that, cobalt mining causes pollution in the environment. Inhalation of dust containing cobalt causes a host of health issues such as lung cancer and damage to human skin.
Other effects include soil degradation and pollution, water pollution due to mine run-offs, etc.
More on the effects of mining can be found here: https://brainly.com/question/2365629
Answer:
one.
Which of the following are negative consequences of cobalt mining in the Democratic Republic of Congo? Select the two correct answers.
Dust from cobalt mines causes lung and skin damage.
Thousands of children work in cobalt mines.
2.
Which of the following statements about recycling electronic waste is true?
Minerals can be extracted from recycled electronics.
3.
Which of the following resources is a conflict mineral used in smart devices?
tin
Explanation:
its all right 200% if you dont hink so thats all right check for your self
Find the volume of a rectangular prism that is
25 cm by 10 cm by 15 cm.
height
length
Answer:
3750 cm.
Explanation:
You multiply the three side measurements to find the volume.
25cm·10cm·15cm
375cm·10cm
3750 cm.
Hope this helps!
Answer:3750cm
Explanation: 25cm by 10cm is 250cm. Then 250cm by 15cm is 3750cm. To find volume, first you multiply length by width, then the answer of that you multiply by height.
Calculate the number of moles in 65.2 grams of Fe(OH)2
Answer:
89.86 g/mol
i hope it help:^
♡♡