2. In which sentence is the term heat used correctly?
A. Heat moves from a cold cup to warm tea.
B. A thermometer measures the heat in an object.
C. The heat from the hot cup warms my hands.
D. Warm soup contains more heat than cold soup does.
Answers
Answer:
c. The heat from the hot cup warms my hands
Related Questions
72.3 g of ice at -15.0 o C has heat energy added to it until it becomes steam at 145 o C. Calculate the total amount of heat energy needed (in Joules) to accomplish this.
Answers
Answer:
H = 226,311.66J
Explanation:
Hello there!
In this case, according to the thermodynamic path ice takes up to steam:
1. Ice (-15°C) --> Ice (0°C) H1
2. Ice (0°C) ---> Water (0°C) H2
3. Water (0°C) --> Water (100°C) H3
4. Water (100°C) --> Steam (100°C) H4
5. Steam (100°C) --> Steam (145°C) H5
It is possible for us to infer that H1, H3 and H5 are computed by means of the mass, specific heat and change in temperature as sensible heat. On the flip side, H2 and H4 are computed as latent heat. Thus, we proceed as follows:
[tex]H1=72.3g*2.093\frac{J}{g\°C}(0+15)\°C=2269.86J\\\\H2=72.3g*334.1\frac{J}{g}=24155.43J\\\\H3=72.3g*4.184 \frac{J}{g\°C}*(100-0)\°C=30250.32J\\\\H4=72.3g*2255.83\frac{J}{g}=163096.51J\\\\H5=72.3g* 2.010 \frac{J}{g\°C}*(145-100)\°C=6539.54J[/tex]
Then, we add them up to obtain the total heat:
[tex]H=H1+H2+H3+H4+H5\\\\H=2269.86J+24155.43J+30250.32J+163096.51J+6539.54J\\\\H=226311.66J[/tex]
Best regards!
What is the volume, in liters, of 2.75 grams of fluorine gas at 35.0°C and 4.55 atm pressure?
Answers
•n =mass in grams of flourine /molar mass
• R=0.0821
•temp must be in kelvins (+273)
volume will be in dm3 which is equals to litres
try it by yourself
good luck
The volume (in litres) of 2.75 g of fluorine gas at 35 °C and 4.55 atm is 0.402 L
How to determine the mole of fluorine gasMass of F₂ = 2.75 gMolar mass of F₂ = 2 × 19 = 38 g/mol Mole of F₂ =?
Mole = mass / molar mass
Mole of F₂ = 2.75 / 38
Mole of F₂ = 0.0724 mole
How to determine the volume Temperature (T) = 35 °C = 35 + 273 = 308 KPressure (P) = 4.55 atmGas constant (R) = 0.0821 atm.L/Kmol Number of mole (n) = 0.0724 moleVolume (V) =?Using the ideal gas equation, the volume of the gas can be obtained as follow:
PV = nRT
Divide both side by P
V = nRT / P
V = ( 0.0724 × 0.0821 × 308) / 4.55
V = 0.402 L
Learn more about ideal gas equation:
https://brainly.com/question/4147359
3. Which of the following provides the best explanation for why the water drop does not slide off the inclined plane?
90 80 70
50
40
30
10
O A The polar water molecules are absorbed by the underlying surface.
OB The polar water molecules cause the surface to become temporarily charged, causing adhesion
OC The polar water molecules exert strong cohesive forces on one another
OD. The polar water molecules are repelled by the nonpolar surface
Answers
Answer:
The polar water molecules exert strong cohesive forces on one another
Explanation:
The forces of cohesion refer to the strong attractive forces that molecules of a substance exert on each other.
This strong attractive force keeps the molecules of the water together and causes the water molecules to be pulled inside towards each other. We refer to this phenomenon as surface tension.
Hence, due to surface tension, water does not run off an inclined plane.
Create the Equation: What is the Percent Yield of Ammonia (NH3) if 11.8 g is recovered in a reaction with 7.02 x 10^23 molecules of Hydrogen gas with excess Nitrogen gas?
I REALLY NEED THE ANSWER FOR THIS PLESASE ITS DUE IN 40 MINTUES
Answers
Answer:
Explanation:
The first thing that you need to do here is to calculate the theoretical yield of the reaction, i.e. what you get if the reaction has a
100
%
yield.
The balanced chemical equation
N
2
(
g
)
+
3
H
2
(
g
)
→
2
NH
3
(
g
)
tells you that every
1
mole of nitrogen gas that takes part in the reaction will consume
3
moles of hydrogen gas and produce
1
mole of ammonia.
In your case, you know that
1
mole of nitrogen gas reacts with
1
mole of hydrogen gas. Since you don't have enough hydrogen gas to ensure that all the moles of nitrogen gas can react
what you need
3 moles H (sub 2)
>
what you have
1 mole H (sub2)
you can say that hydrogen gas will act as a limiting reagent, i.e. it will be completely consumed before all the moles of nitrogen gas will get the chance to take part in the reaction.
So, the reaction will consume
1
mole of hydrogen gas and produce
1
mole H
2
⋅
2 moles NH
3
3
moles H
2
=
0.667 moles NH
3
at
100
%
yield. This represents the reaction's theoretical yield.
Now, you know that the reaction produced
0.50
moles of ammonia. This represents the reaction's actual yield.
In order to find the percent yield, you need to figure out how many moles of ammonia are actually produced for every
100
moles of ammonia that could theoretically be produced.
You know that
0.667
moles will produce
0.50
moles, so you can say that
100
moles NH
3
.
in theory
⋅
0.50 moles NH
3
.
actual
0.667
moles NH
3
.
in theory
=
75 moles NH
3
.
actual
Therefore, you can say that the reaction has a percent yield equal to
% yield = 75%
−−−−−−−−−−−−−
or 75 moles NH sub3
I'll leave the answer rounded to two sig figs.
Determine which molecule in each pair has the stronger intermolecular forces. Explain why. The main reason that NH3 has [ Select ] intermolecular forces than CH4 is that NH3 [ Select ] . The main reason that NO2 has [ Select ] intermolecular forces than CO2 is that NO2 [ Select ] . The main reason that CS2 has [ Select ] intermolecular forces than CO2 is that CS2 [ Select ] .
Answers
Answer:
See explanation
Explanation:
As for NH3 and CH4, the former is a polar molecule and possess a dipole. Hence, in addition to dispersion forces, dipole-dipole interaction as well as hydrogen bonding creates a stronger intermolecular interaction than in nonpolar CH4 where only dispersion forces are in operation.
Between NO2 and CO2, the former possesses a dipole moment while the later does not. As a result of that, dipole interaction are in operation in NO2 while only dispersion forces are n operation in CO2.
Between CO2 and CS2, the both molecules are nonpolar but CS2 has a greater molecular mass than CO2. Recall that the greater the molecular mass of a substance the greater its magnitude of intermolecular forces.
Taking into account the intermolecular forces, you get that:
The main reason that NH₃ has weaker intermolecular forces than CH₄ is that NH₃, being nonpolar, possesses London Dispersion Forces, while CH₄ possesses the Hydrogen Bonding forces.The main reason that NO₂ has the same intermolecular forces than CO₂ is that in NO₂ and CO₂ there are London forces because they are nonpolar molecules. The main reason that CS₂ has the same intermolecular forces than CO₂ is that CS₂ in CS₂ and CO₂ there are London forces because they are nonpolar molecules.Intermolecular forces or bonds are those interactions that hold molecules together. These are electrostatic forces.
Van der Waals forces are weak attractions that hold electrically neutral molecules together. At some point these molecules present an induced dipole, that is, the molecule acquires a partially positive and a partially negative charge momentarily, causing them to attract each other. They are Van de Waals forces: Dipole - Dipole Forces, London Forces, Ion - Dipole Forces.
London Dispersion Forces: occurs between nonpolar molecules due to the movement of electrons. At some point there are more electrons to one side, which, being close to another atom or molecule, the electrons of the second are repelled, originating two instantaneous dipoles, which originate an attractive force. In summary, this type of force occurs because when two molecules approach, a distortion of the electronic clouds of both is originated, generating in them, transient induced dipoles, due to the movement of the electrons, thus allowing them to interact with each other. They are very weak forces.Ion-ion forces: It is the attraction between two ions of different charges: cations (positively charged ion) and anions (negatively charged ion). That is, it occurs between different charged molecules that will tend to form an electrostatic bond between the ends of opposite charges due to the attraction between them.Ion-dipole forces: these are forces of attraction between an ion (an atom that has lost or gained an electron, so it has a charge) and a polar molecule. A molecule is a dipole when there is an asymmetric distribution of electrons because the molecule is made up of atoms of different electronegativity. The ion then binds to the part of the molecule that has its opposite charge: the positive end of the polar molecule is oriented towards the anion (negatively charged ion) and the negative end of the polar molecule is oriented towards the cation ( positively charged ion).Dipole-dipole forces: dipole-dipole forces are forces of attraction between polar molecules. These molecules attract when the positive end of one of them is close to the negative of the other.Hydrogen bonds: they are a type of dipole-dipole force. In this interaction, a molecule that presents hydrogen interacts with another that presents an atom with high electronegativity, such as oxygen, fluorine or nitrogen (O, F, N). In this way, between the hydrogen, which has a low electronegativity and the electronegative atom, an interaction is established, due to their opposite charges.The relative order of magnitude of the intermolecular forces is:
Ion-ion forces> Ion-dipole forces> Hydrogen bonds> Dipole-dipole forces> London Dispersion Forces
Taking into account all the above, it can be said that:
The main reason that NH₃ has weaker intermolecular forces than CH₄ is that NH₃, being nonpolar, possesses London Dispersion Forces, while CH₄ possesses the Hydrogen Bonding forces.The main reason that NO₂ has the same intermolecular forces than CO₂ is that in NO₂ and CO₂ there are London forces because they are nonpolar molecules. The main reason that CS₂ has the same intermolecular forces than CO₂ is that CS₂ in CS₂ and CO₂ there are London forces because they are nonpolar molecules.Learn more:
https://brainly.com/question/17111432?referrer=searchResultshttps://brainly.com/question/14220340?referrer=searchResultsHELP PLS THANK YA!!!
Answers
Answer:
there is the answers. hope this helps
The results of photosynthesis as glucose and oxygen
A) Photosynthesis
B)Products
C)Chloroplasts
D)Glucose
Answers
Answer:
Products
Explanation:
Select whether the statement is for Speed, Velocity, or Acceleration.
The car speeds up from 5 mph to 10 mph.
Speed
Acceleration
Velocity
Answers
Answer:
Explanation:
acceleration no cap
1. Which is a chemical property of wood?
conductivity
flammability
malleability
Answers
Answer:
Wood consists mainly of organic substances (99% of the total mass). Elemental chemical composition of wood of different breeds is practically the same. Absolutely dry wood on average contains 49% of carbon, 44% of oxygen, 6% of hydrogen, 0.1-0.3% of nitrogen. When burning wood remains its inorganic part - ash.
So the answer is flammability because wood is flammable.
How many moles of O₂ are needed to burn 2.5 moles of CH₃OH?
Answers
Answer:
3.75 moles
Explanation:
The chemical equation is 2CH₃OH + 3O₂ -> 2CO₂ + 4H₂O
2 moles of CH₃OH are burned by 3 moles of O₂
For 2.5 moles of CH₃OH are burned by x moles of O₂
Let's solve for x :
2*x=2.5*3 => 2*x=7.5 => x=3.75 moles of O₂ are needed to burn 2.5 moles of CH₃OH
Is carbon a metal or a nonmetal? How many valence electrons does a carbon atom have?
Answers
Answer:
carbon is a nonmetal with 4 valence electrons
Explanation:
The element carbon is on the nonmetal section of the periodic table.
Select the correct answer.
How does the equilibrium change with the removal of hydrogen (H2) gas from this equation?
2H2S ⇌ 2H2(g) + S2(g)
A.
Equilibrium shifts right to produce more product.
B.
Equilibrium shifts left to produce more reactant.
C.
Equilibrium shifts right to produce less product.
D.
Equilibrium shifts left to produce less reactant.
Answers
Answer:
the guy above is wrong
Explanation:
i just did the test and got it wrong
3. An area where a particular plant has thrived for 50 million years suffers a
100-year-long drought. What evidence of the drought might be found in the fossil
record?
A. Fossils of the plant are abundant right up until the present day.
B. Fossils of the plant appear in recent rock layers but not in older ones.
C. Fossils of the plant are present in older rocks but disappear at a point in the
fossil record
D. It is impossible for the fossil record to show evidence of the drought.
Answers
Answer:
Fossils of the plant are abundant right up until the present day. Fossils of the plant appear in recent rock layers but not in older ones.
Explanation:
yay
Larissa is making sautéed purple cabbage. First, she washes and cuts the cabbage into long thin strands. Then, she puts a
pan on the stove and adds butter. She allows the butter to melt and turn to liquid. Next, she adds the cabbage to the butter
sprinkles some salt on it, and stirs it. Larissa watches as the cabbage sizzles, releases steam, and softens. To finish the side
dish, she adds a squeeze of lemon juice to it, which causes it to change from purple to pink. Finally, Larissa empties the
cabbage into a bowl and puts it on the dinner table.
Which of the events involves a chemical reaction?
O Larissa adds butter to a pan and allows it to melt and turn to liquid.
O Larissa adds a squeeze of lemon juice to the cabbage, and it turns pink.
O Larissa watches as the cabbage sizzles, releases steam, and softens.
O Larissa washes and cuts some purple cabbage into long thin strands.
O Larissa empties the cabbage into a bowl and puts it on the dinner table.
O Larissa adds the cabbage to the butter with a sprinkle of salt and stirs it.
Answers
Answer:
When she adds lemon juice
Explanation:
I believe that it is when she adds lemon juice. Lemon juice is an acid, which causes a chemical reaction. It turns from purple to pink because of the acid. Lmk if it's right but I'm 99.9% percent certain it is correct.
What is the volume of solution if 2.0 moles of 0.4 M HF are present in the solution?
Answers
Answer:
5 L
Explanation:
Molarity = mol/L ----> L = mol/molarity
2.0 moles / 0.4 M HF = 5 L
pls show your work thank you will mark the Brainliest
Answers
Answer:
1.42L of the 9.0M NaOH are required
Explanation:
Molarity is an unit of concentration in chemistry defined as the ratio of the moles of a solute (In this case NaOH) and the volume of the solution.
To solve this question we must know the moles of NaOH required in 4.25L of a 3.0M NaOH as follows:
4.25L * (3.0moles / L) = 12.75 moles of NaOH are required
As all NaOH must come from the 9.0M NaOH the volume we need is:
12.75 moles NaOH * (1L / 9.0 moles NaOH) =
1.42L of the 9.0M NaOH are requiredTRUE OR FALSE
All of the elements on Earth, except for hydrogen, were formed in the interiors of stars.
Answers
Answer:
True
Explanation:
I checked several websites to double check for you.
Answer:
Except for hydrogen and some helium created in the Big Bang, all of the stuff we, and the Earth around us, are made of, was generated in stars, through sustained fusion or in supernova explosions i thank its true :) hope this helps
Which is the correct result of mitosis and
meiosis?
Answers
Answer:
[tex]\boxed {\boxed {\sf B. \ 2 \ diploid \ cells \ and \ 4 \ haploid \ cells}}[/tex]
Explanation:
Mitosis is a type of cell division. It occurs in somatic cells, which are basically any cells other than sex cells. A cell replicates the genetic material then undergoes one division to create 2 identical cells, both with a complete set of chromosomes. These are known as diploid cells.
Meiosis is another type of cell division, but it occurs only in sex cells, called gametes. The cell replicates the genetic material and the chromosomes cross over, which creates completely unique cells. The cell divide to create 2 cells, but then they divide again to create 4 cells. They each have half of the chromosomes of a somatic cell, so they are haploid cells
So, mitosis results in 2 diploid cells and meiosis forms 4 haploid cells.
The coolest stars tend to be which color? A. White B. Blue C. Yellow d. Red
Answers
Answer:
D
Explanation:
red
Answer:
Red stars are the coolest along the colors and temperatures of stars.
Explanation:
Hope this helps! <3
How many sulfur dioxide
molecules are in 2.8 moles of
sulfur dioxide?
?]
[?]x10?
Answers
1. A wave travels at a velocity of 13 m/s and has a
wavelength of 7m. What is the frequency of the
wavelength?
Answers
b it is Explanation:
What is the molarity of a solution containing 52.6g of NaOH dissolved in 2.5L of water?
Answers
Answer:
Molarity = no of moles of solute/volume of solution in litre
number of moles =given mass/molar mass
moles= 50.6/40 = 1.315 moles
now,
molarity = 1.315/2.5= 0.526M
How many liters at STP are in 8.0 x 102 grams of sulfur dioxide?
Answers
Answer:
280 liters at STP are in 8.0*10² grams of sulfur dioxide.
Explanation:
The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.
In this case, the molar mass of sulfur dioxide, that is, the mass of one mole of the substance, is 64 g/mole.
You can apply the following rule of three: if by definition of molar mass 64 grams of sulfur dioxide are contained in 1 mole, 8.0*10² grams are contained in how many moles?
[tex]amount of moles=\frac{8*10^{2}grams*1 mole }{64 grams}[/tex]
amount of moles= 12.5 moles
Now you can apply a new rule of three: if by STP conditions 1 mole of any gas occupies a volume of 22.4 liters, 12.5 moles will occupy how much volume?
[tex]volume=\frac{12.5 moles*22.4 L}{1 mole}[/tex]
volume= 280 L
280 liters at STP are in 8.0*10² grams of sulfur dioxide.
When hydrogen and fluorine bond, the fluorine atom's electron configuration most resembles which element? A. nitrogen B. helium C. oxygen D. neon
Answers
Answer:
D. neon.
Explanation:
Hello there!
In this case, according to the following bonding:
[tex]H-F[/tex]
It is possible to bear to mind the fact that hydrogen has one valence electron whereas fluorine has seven. Moreover, once they bond, we understand fluorine takes the only hydrogen's valence electron to attain the electron configuration of the former's contiguous noble gas which is D. neon.
Best regards!
29 mols of na2So4 is how many grams
Answers
Answer:
[tex]4118\ g[/tex]
Explanation:
[tex]We\ are\ given,\\No.\ of\ moles\ of\ Na_2SO_4\ provided=29\ moles\\Hence,\\Now,\\Lets\ calculate\ the\ Gram\ Molecular\ Mass\ of\ Na_2SO_4.\\We\ know\ that,\\Gram\ Atomic\ Mass\ of\ Sodium(Na) \approx 23\ g\\Gram\ Atomic\ Mass\ of\ Sulphur(S) \approx 32\ g\\Gram\ Atomic\ Mass\ of\ Oxygen(O) \approx 16\ g\\Hence,\\We\ observe\ that,\\One\ molecule\ of\ Na_2SO_4\ is\ made\ up\ of\ 2\ Sodium\ Atoms,\ 1\\ Sulphur\ Atom\ and\ 4\ Oxygen\ Atoms.[/tex]
[tex]Hence,\\Gram\ Molecular\ Mass\ of\ Na_2SO_4=2*(GAM\ of\ Na)+1*(GAM\ of\ S)\\+4*(GAM\ of\ O)\\=2*23+1*32+4*16\\=46+32+64\\=46+96\\=142\ g[/tex]
[tex]Hence,\\We\ also\ know\ that,\\Mass\ of\ A\ Sample=No.\ of\ moles*Gram\ Molecular\ Mass\\Hence,\\Mass\ of\ 29\ moles\ of\ Na_2SO_4=29*142=4118\ g[/tex]
Answer:
4118.2
Explanation:
Given: 29 moles of na²[tex]So^{4}[/tex]
To find: In grams.
Solution: Wrong
If 1 na²[tex]So^{4}[/tex] is 142 grams, then 29 grams will be found if a set of fraction has been set up;
Let [tex]"x"[/tex] be the variable
[tex]\frac{142}{1} = \frac{29}{x}[/tex]
Cross multiply
[tex]\frac{142}{29}[/tex] [tex]= 4.9[/tex]
Correct Solution
Multiply 29 by 142 = 4118
Evidence of Earth’s plate tectonic activity is most obvious after an earthquake. Which explanation best describes this plate tectonic movement?
A: Earth’s plates stress one another. However, when an earthquake occurs, plate movement is due to an unbalanced force on the plates.
B: Earth’s plates are moving fast. However, the force of friction slows their movement.
C: The force of gravity causes the floating plates to move up and down. The plate movement sometimes results in earthquakes.
D: Earth’s plates continually place stress on one another. However, the force is balanced during an earthquake.
Answers
Answer:a
Explanation:bc
Plates on Earth are moving quickly. Yet, friction causes them to travel more slowly. So, the correct options are B and C.
What are tectonic plates?Tectonic plates are enormous fragments of the upper mantle and crust of the Earth. They are composed of both continental and oceanic crust. Earthquakes occur around mid-ocean ridges and the large faults which mark the edges of the plates.
The Earth's plates are shifting swiftly. Nevertheless, friction slows their movement. Gravity causes the floating plates to rise and fall. On occasion, the movement of tectonic plates results in earthquakes.
When compared to the Earth's mantle, the plates behave like solid, unyielding shells. The lithosphere is the name given to this thick outer layer.
Thus, the correct options are B and C.
Learn more about Tectonic plates, here:
https://brainly.com/question/30805154
#SPJ3
Lab: Titration Assignment: Lab Report
I need the answer to the graph on the last page.
Answers
Answer:
There is none
Explanation:
Answer: I've attached my lab report for anyone who needs it. Hope this helps! (I didn't know what to put for some of the answers on the graph, but I've filled it out for the most part)
Select whether the statement is for Speed, Velocity, or Acceleration.
The earth travels at 30 kilometers per second.
Velocity
Speed
Acceleration
Answers
Answer:
I think that the statement is relative to speed because it is saying km per second.
Answer:
Speed
Explanation:
Nitric acid+ calcium oxide gives what
Answers
Answer:
HNO3 + Ca(OH)2 ====> H2O + Ca(NO3)2
it gives water and Calcium nitrate
Hope to helpfull.
Answer:
HNO3 + Ca(OH)2 ====> H2O + Ca(NO3)2
Help a #QUEEN out PLSSSS!!!