4709.25 joules of heat are absorbed when 25 grams of water increases temperature by 45 K.
Let suppose that temperature change experienced by water is entirely sensible. Then, we can estimated the heat absorbed by the water sample ([tex]Q[/tex]), in joules, through this expression:
[tex]Q = m\cdot c \cdot \Delta T[/tex] (1)
Where:
[tex]m[/tex] - Mass of the water sample, in grams.[tex]c[/tex] - Specific heat of water, in joules per kilogram-Kelvin.[tex]\Delta T[/tex] - Temperature change, in Kelvin.If we know that [tex]m = 25\,g[/tex], [tex]c = 4.186\,\frac{J}{g\cdot K}[/tex] and [tex]\Delta T = 45\,K[/tex], then the heat absorbed by the water sample is:
[tex]Q = (25\,g)\cdot \left(4.186\,\frac{J}{g\cdot K} \right)\cdot (45\,K)[/tex]
[tex]Q = 4709.25\,J[/tex]
4709.25 joules of heat are absorbed when 25 grams of water increases temperature by 45 K.
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If i initially have a gas with a pressure of 84 kpa and a temperature of 350 c and i heat it an additional 230 degrees, what will the new pressure be? assume the volume of the container is constant.
Answer:
67.824
Explanation: You want to use the combined gas law equation (P1*V1)/(n1*T1)=(P2*V2)/(n2*T2). So first cross out what remains constant, so volume(V) and I assume moles (since it was not mentioned as a change). Then you can solve algebraically for the answer!
Hope this helped!
The new pressure will be 139.2 kpa .
What is the combined Gas Law?According to combined gas law,
[tex]\rm\dfrac{PV}{nT} = R[/tex]
In the Combined Gas Law,if we change either one of the variables the others will also change.
When the moles of the gas is constant , the above equation can be written as ,
[tex]\rm \dfrac{P'V'}{T'}= \dfrac{PV}{T}[/tex]
Given is P = 84kpa , T= 350⁰ C and T' = 350+230=580⁰ C , V=V' , P'=?
So we will substitute the values in the above formula keeping volume constant.
[tex]\rm \dfrac{P'}{T'}= \dfrac{P}{T}[/tex]
[tex]\rm\dfrac{P'}{580}= \dfrac{84}{350}[/tex]
[tex]\rm P' = \dfrac{84\times 580}{350}[/tex]
[tex]\rm P'= 139.2 \;kpa[/tex]
Therefore the new pressure will be 139.2 kpa .
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Drag the names to the order planets based their distance from the sun, beginning with the planet closet to the sun.
Answer: In this order
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
Explanation:
Answer:
Mars.....................
which of the following properties of an electron in an atom can be expressed with quantum numbers? energy linear momentum angular momentum spin
The two properties of an electron which can be expressed with quantum numbers are angular momentum and spin.
The properties of an electron in an atom can be represented using four sets of quantum numbers. These four sets of quantum numbers include;
Principal quantum numberOrbital quantum numberMagnetic quantum numberSpin quantum numberAmong the options given in the question, the two properties of an electron which can be expressed with quantum numbers are angular momentum and spin.
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Lab: Ionic and Covalent Bonds Click the links to open the resources below. These resources will help you complete the assignment. Once you have created your file(s) and are ready to upload your assignment, click the Add Files button below and select each file from your desktop or network folder. Upload each file separately.
PLEASE HELP ME
Explanation:
Here you go, my teacher hasnt graded it yet.
Protons
Charge:
Mass:
Location:
Role in the atom:
Answer:
Protons are positively charged. The mass is slightly lower than a neutron.The location of a proton is nucleus. The the role of a proton is to help bind the nucleus together.
Explanation:
Which compound is an acidic oxide?
Aaluminium oxide
carbon dioxide
copper(II) oxide
magnesium oxide
Answer:
Carbon dioxide
Explanation:
Metal oxides are basic and Non metal.oxides are acidic.
Al, Be, Zn,Sn ,Pb oxides are amphoteric so they show both acidic and basic properties.
From the above answers Al, Cu and Mg are metals so their oxides are acidic while Carbon is a non metal.so CO2 is an acidic oxide
How to tell if a reaction is exothermic.
Answer:
If the reaction loses heat it is exothermic.
Is krypton a good or poor conductor of electricity? Why? I
Answer:
No it is not a good conductor
Explanation:
Krypton is classified as a gas and nonmetal. Like many nonmetals and gases, krypton is an insulator, so it is a relatively poor conductor of heat and electricity.
Write the configuration for electron: 4, 2, -1, +12
Answer:
-1
Explanation:
electrons are negative
What is the density of an object that has a mass of 149. 8 g and displaces 12. 1 ml of water when placed in a graduated cylinder?.
Answer:
12.38 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]d = \frac{m}{v} \\ [/tex]
m is the mass
v is the volume
From the question
m = 149.8 g
v = 12.1 mL
We have
[tex]d = \frac{149.8}{12.1} = 12.380165... \\ [/tex]
We have the final answer as
12.38 g/mLHope this helps you
(i will give brainliest)
The following image shows what happens when the particles in a certain state occupy a space. What is the state of the substance that is occupying the space and how do you know?
A. The substance is a gas because the particles are spreading out to fill the space of the container.
B. The substance is a liquid because the particles inside are taking the shape of the container.
C. The substance is a mixture of a gas and a liquid because the particles are filling the space of the container.
D. The substance is a solid because the particles inside the box have a definite shape.
Answer:
A
Explanation:
The substance is a gas because the particles far randomly arranged and far apart from each other. This happens because when a substance is a gas, particles have weak attraction to each but a lot more kinetic energy which means the they move around all the time spreading out to fill the container. If it was a solid, then all the particles would be very close together and have a fixed position and if it was a liquid then the particles would be fairly close and moving around each other but as we can see in the diagram, all the particles are far apart confirming that it is a gas.
Answer:
the answer is A beacause the other person is right :)
Explanation:
please give them brainliest
Can someone help me with my science it’s super hard :(
Answer: here is a description of what they look like since I cannot see the diagram.
Mitochondria- wavy line
Ribosomes- little dots
Chromosome- X
Nucleus- Circle with bite taken out of it
Endoplasm- Bubble
Nuclear membrane- Outer layer/bubble
Golgi-wavy circle thing
Vacuole- Bigger circle (but not nucleus)
Cytoplasm- its the jelly on the inside
Cell wall- only in plant cells, looks like a box
Cell membrane- The outmost part of the animal cell, the barrier.
I sure hope this helps!!!
If I am calculating the volume in pv=nrt
Then, how do I know what units it is in coz normally it would be m3 but how do I know that it's not dm3
Explanation:
If you use the SI units for P, n, R and T ( In Pa, mol, JK-1mol-1 and K respectively) you'll end up with a Volume with m3 units. So if you have others in different units first convert them into the units I mentioned above and you will definitely get the answer in m3.
Two chemicals, Z and X react completely to form a product, Y. If 8.7 grams of x react to produce 19.5 grams of Y, how many grams of Z must have reacted to form this much product?
Answer:
Z= 10.8
Explanation:
The simple formula Z + X = Y can solve this problem. Since we are given that,
X= 8.7 GramsY= 19.5 GramsThen we can just substitute the actually values for the letters.
Z + 8.7 = 19.5
From here, we can just do simple math to find the answer.
Z + 8.7 - 8.7 = 19.5 - 8.7
Z = 10.8
So, 10.8 grams of Z reacted to form the product.
- A beam of electrons has.....
(A) Wave properties.
(B) Particle properties.
(C) Both of these
(D) Neither of these
Answer:
(C) Both of these
Explanation:
A beam of electrons has both of these Wave properties and Particle properties.
What type of molecule is pentanal?
A. Aldehyde
O B. Ketone
O C. Alcohol
O D. Ester
Answer:
[tex] \huge \color{indigo} \boxed{a. \: aldehyde}[/tex]
Explanation:
Pentanal is considered to be a fatty aldehyde lipid molecule. These are compounds containing more than one aldehyde group. Pentanal is a very hydrophobic molecule, practically insoluble in water, and relatively neutral.
14 In which group are all the elements found
naturally only in compounds?
(1). 18
(3) 11
(2) 2
(4) 14
If a certain person has a mass of 250kg on earth, would that person's mass be on the moon, if the moon's gravity is 1.62m/s2? *
245kg x 1.62m/s2
245 x 1.62m/s2
It remains the same
The person would be weightless
Answer:
it remains the same
Explanation:
mass is like name is not changed any where mass express the amount of matter in an object which is fixed any where regardless its gravity
Que pasa si a una taza de arena le pongo espuma y lo agito por 10 minutos?
Answer:
Conversion of energy
Explanation:
Shaking the sand is a form of kinetic energy. The friction of the sand particles rubbing against each other converts the kinetic energy to heat energy. Some of the kinetic energy also converts into the energy of sound waves, which you can hear while you shake the sand.
Assume that the test tube shown started out having 10.00 g of mercury(II) oxide. After heating the test tube briefly, you find 1.35 g mercury(II) oxide left and 8.00 g of liquid mercury. How much oxygen gas was produced by the chemical reaction? Show your work.
This problem is providing information about the initial mass of mercury (II) oxide (10.00 g) which is able to produce liquid mercury (8.00 g) and gaseous oxygen and asks for the resulting mass of the latter, which turns out to be 0.65 g after doing the corresponding calculations.
Initially, it is given a mass of 10.00 g of the oxide and 1.35 g are left which means that the following mass is consumed:
[tex]m_{HgO}^{consumed}=10.00g-1.35 g=8.65 g[/tex]
Now, since 8.00 grams of liquid mercury are collected, it is possible to calculate the grams of oxygen that were produced, by considering the law of conservation of mass, which states that the mass of the products equal that of the reactants as it is nor destroyed nor created. In such a way, the mass of oxygen turns out to be:
[tex]m_{O_2}=8.65g-8.00g=0.65g[/tex]
Learn more:
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Georgia completed an investigation about different forces and came up with an explanation. What does she need to support her explanation?
Problem
Conclusion
Question
Evidence
Georgia needs evidence
Compared to the energy of an electron in the second shell of an atom of sulfur, the energy of an electron in the
1
first shell is lower
2
first shell is the same.
3
third shell is lower
4
third shell is the same.
Answer:
First shell is lower
Explanation:
The electron has to absorb energy to excite and go to higher energy levels/ shells and should release energy to go to lower energy levels/ shells. This means higher the shell , more energy is required and vice versa
Which one of the following would form a precipitate when mixed with LiOH?
A) KNO3
B) NH4Cl
C) Ca(C2H3O2)2
D) ZnBr2
Answer:
ZnBr2
Explanation:
KNO3 + LiOH -------> no reaction
This is because KNO3 and LiOH completely ionize.in water and form neutral solutions.Since both are neutral no reaction occurs
NH4Cl + LiOH -----> NH3 (aq) + H2O (l) + LiCl(aq)
None of the above products are precipitates
Ca(C2H3O2)2 + 2LiOH -----> Ca(OH)2 (aq) + 2LiC2H3O2 (aq)
ZnBr2 + 2LiOH -----> Zn(OH)2 (s) + LiBr2 ( aq)
Zn(OH)2 thus formed is a white precipitate
However when excess LiOH is added Zn(OH)2 precipitate will dissolve to give a clear solution of Li2ZnO2 .
You can remember this by the fact that Na,K,Rb,Cs,Ca,Sr,Ba hydroxides are soluble in water and all other hydroxide are precipitated in water
Zn(OH)2 (s) + 2 LiOH ------> Li2ZnO2(aq) + 2 H2O ( l)
The only compound that will form a precipitate with LiOH would be ZnBr2
Precipitation reactionsThese are double displacement reactions in which precipitates are produced. Precipitates are insoluble solids formed from the combination of ions in aqueous solutions.
In this case, a reaction between LiOH and ZnBr2 would be as follows;
2LiOH + ZnBr2 ----------> 2LiBr + Zn(OH)2 (s)
Zn(OH)2 is an insoluble salt and will precipitate out in the solution.
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1. Determine how many atoms are present in 2.5 moles of Silicon? (15.05 x 1023 atoms)
X
To solve this, we have to turn the moles into atoms:
2.5 moles/1 x 6.022x10^23 atoms/1 mole = 15.05 x 10^23 atoms
Answer: 15.05 x 10^23 atoms
I hope this helps!
Silicon is the eighth most abundant element in the Universe. There will be 15.05 * 10²³ atoms in the silicon.
What is number of moles?Silicon is the eighth most abundant element in the Universe; it is made in stars with a mass of eight or more Earth suns.
Near the end of their lives these stars enter the carbon burning phase, adding helium nuclei to carbon to produce oxygen, neon, magnesium and silicon.
1 mole contains 6.022x10²³ atoms.
2.5 mole contains = x atoms.
x= 2.5 moles/ 6.022x10²³ atoms.
= 15.05 x 10²³ atoms
Therefore, Silicon is the eighth most abundant element in the Universe. There will be 15.05 * 10²³ atoms in the silicon.
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why is transfer of the heat by the actual movement of the warmed matter
Answer:
The warmer the water gets the particles begin to expand and starts vibrating
Determine the wavelength of the light absorbed when an electron in a hydrogen atom makes a transition from an orbital in which n=2n=2 to an orbital in which n=7n=7.
Answer:
The expression for the wavelength of radiation is,
λ
1
=R(
n
1
2
1
−
n
2
2
1
)
Substitute values in the above expression,
λ
1
=109677×(
2
2
1
−
4
2
1
)=109677×(
4
1
−
16
1
)=109677×(
64
12
)
λ=4.86×10
−5
cm=486×10
−9
m=486nm.
The line belongs to bluish green colour.
in a petri dish, a certain type of bacterium doubles in number every 30 minutes. there were originally 16, or 2^4, bacteria in the dish. after 150 minutes, the number of bacteria has doubled 7 times, multiplying by 2^7. Now the population of bacteria is 2^4 • 2^7. Expressed as a power, how many bacteria are in the petri dish after 150 minutes? A. 2^28 B. 2^11 C.4^11 D.2^7
Answer:
D
Explanation:
Answer:
its not D it's B trust me
Explanation:
What is the theoretical yield of sodium chloride when 8.3 g of sodium is reacted with 4.5 g of chlorine? 2Na(s) + Cl2(g) → 2NaCl(s)
The theoretical yield of sodium chloride when 8.3 g of sodium react with 4.5 g of chlorine is 3.30 g
We'll begin calculating the masses of Na and Cl that reacted and the mass of NaCl produced from the balanced equation.
2Na + Cl₂ —> 2NaClMolar mass of Na = 23 g/mol
Mass of Na from the balanced equation = 2 × 23 = 46 g
Molar mass of Cl₂ = 2 × 35.5 = 71 g/mol
Mass of Cl₂ from the balanced equation = 1 × 71 = 71 g
Molar mass of NaCl = 23 + 35.5 = 58.5 g/mol
Mass of NaCl from the balanced equation = 2 × 58.5 = 117 g
SUMMARY
From the balanced equation above,
46 g of Na reacted with 71 g of Cl₂ to produce 117 g of NaCl
Next, we shall determine the limiting reactant.From the balanced equation above,
46 g of Na reacted with 71 g of Cl₂
Therefore,
8.3 g of Na will react with = (8.3 × 71)/46 = 12.81 g of Cl₂
From the calculation made above, we can see that a higher amount (i.e 12.81 g) of Cl₂ than what was given (i.e 4.5 g) is needed to react completely with 8.3 g of Na.
Therefore, Cl₂ is the limiting reactant and Na is the excess reactant
Finally, we shall determine the theoretical yield of NaCl by using the limiting reactant (i.e Cl₂)From the balanced equation above,
71 g of Cl₂ reacted to produce 117 g of NaCl.
Therefore,
4.5 g of Cl₂ will react to produce = (4.5 × 117)/71 = 3.30 g of NaCl
Thus, the theoretical yield of NaCl produced is 3.30 g
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Answer:
The correct answer is 7.4 g NaCl
Explanation:
What are the major reservoirs for sulfur
Answer:
the ocean, the ocean floor basalts, evaporite deposits and reduced marine sediments.
Explanation:
What is q in chemistry.
Answer:
The reaction quotient!
Explanation:
hope this helped :D
