Answer:
b
Explanation:
Explain how thermal energy is transferred in convection.
Answer:
Convection occurs when particles with a lot of heat energy in a liquid or gas move and take the place of particles with less heat energy. Heat energy is transferred from hot places to cooler places by convection. Liquids and gases expand when they are heated. ... As a result, the particles take up more volume.
The thermal energy is transferred in convection through the movements of fluids, such as air or water.
Thermal energy refers to the energy associated with the movement of particles in a system. As temperature increases, the particles in a substance gain kinetic energy and move faster, resulting in an increase in thermal energy.
When a fluid is heated, its molecules gain kinetic energy and begin to move faster, causing them to spread out and become less dense. This creates a region of warm, less dense fluid that rises upward due to buoyancy.
As the warm fluid rises, cooler, denser fluid moves in to take its place, creating a convection current. This process continues as long as there is a temperature difference between the warm and cool fluids. The movement of the fluids transfers thermal energy from the warmer areas to the cooler areas.
Therefore, In convection, thermal energy is transferred through the movement of fluids, such as air or water.
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Please help noowwwww... if you don’t know please don’t answer
Answer:
i honetly dont thing anyone knows that so look it up
Explanation:
When you have dominant allele T, recessive for t, T for tall and t for short, what will be phenotype for Tt?
PLEASE ANSWER QUICKLY I'LL GIVE 45 POINTS
Answer:
TT and Tt genotypes both expressed the tall phenotype because the T is dominant to t. Only the tt genotype expressed the short phenotype.
Explanation:
Hope this helped!
A certain metal alloy is composed of 10% tin, 16% antimony, and 74% lead. If you were to have 500 g of the alloy, how many grams of tin would be found in this sample?
The mass of Tin in alloy = 50 g
Further explanationGiven
10% tin, 16% antimony, and 74% lead.
mass of alloy = 500 g
Required
grams of tin
Solution
The mass percent of each component of the mixture shows the mass ratio of each component
%tin in alloy = 10%, so mass of tin :
[tex]\tt 10\%\times 500~g=50~g[/tex]
please help if you can
2H2(g) + O2(g) → 2H2O(l)
The chemical equation above describes a(n)__________.
A). endothermic change
B). reversible state change
C). chemical change
D). physical change
Answer:
i cants bye
Explanation:
byeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
Sodium Tetraborate, a naturally occurring mineral, is crushed into Borax. This is an example of a ________change. *
Chemical Change
Synthetic Change
Physical Change
Please Help I will mark brainllest for the first answer. If you dont know the answer do not answer please.
Answer:
Chemical Change
Explanation:
In the reaction, 210 kJ of heat energy is used to form 3.0 moles of hydrogen.
Calculate how much heat energy is needed to make 1000 kg of hydrogen.
Heat energy needed : 3.5 x 10⁷ kJ
Further explanationHeat is a form of energy that can flow from high-temperature objects to low-temperature objects.
So heat moves when there is a difference in temperature and can increase or decrease the temperature. An object that receives a lot of heat will cause a large increase in temperature
The amount of heat is influenced by the mass of the object and the difference in temperature
Can be formulated
Q = m.c.Δt
Q: heat received or removed by an object (J)
m: object mass (kg)
c: heat type substance (J / kg⁰C)
ΔT: temperature change (⁰C)
210 kJ of heat energy is used to form 3.0 moles of Hydrogen, so heat energy for 1 mol Hydrogen :
[tex]\tt \dfrac{210}{3}=70~kJ/mol[/tex]
mol of 1000 kg of Hydrogen=10⁶ g(MW=2 g/mol)
[tex]\tt \dfrac{10^6~g}{2}=5.10^5[/tex]
The heat energy :
[tex]\tt 70~kJ/mol\times 5.10^5~mol=3.5\times 10^7~kJ[/tex]
At which type of boundary do lithospheric plates collide?
two answer multiple choice-- please help! 18 pts!
What is true about reaction spontaneity and entropy?
The rusting of iron is a nonspontaneous process because rust particles have less entropy than iron, and reactions with a decrease in entropy are nonspontaneous.
A spray of perfume diffusing in a room is a spontaneous process because gas particles have higher entropy when they are spread evenly around the room.
Answer: A spray of perfume diffusing in a room is a spontaneous process because gas particles have higher entropy when they are spread evenly around the room.
Explanation:
Entropy is the measure of randomness or disorder of a system. If a system moves from an ordered arrangement to a disordered arrangement, the entropy is said to decrease and vice versa.
Spontaneous reactions are those reactions which takes place on their own and do not require any external energy source. Spontaneous reactions are always accompanied by an increse in entropy.
Thus a spray of perfume diffusing in a room is a spontaneous process because gas particles have higher entropy when they are spread evenly around the room.
which of the following described the process of osmosis?
Answer:
a process which occurs when there is a difference in solute concentration between two solutions separated by a semipermeable membrane.
hope this helps
Guys please help me.
Explain how an Ion of oxygen is different from an atom of oxygen and how are they similar
Explanation:
An atom is the smallest indivisible particle of any substance that takes part in a chemical reaction.
All atoms are identified by the number of protons in them. Protons are the positively charged particles in an atom.
Ions are atoms that have either lost or gained electrons. Therefore, they become charged. Atoms are neutral particles where the number of protons and electrons are the same.Therefore, atoms and ions are similar because the atom and ion of an element have the same number of protons but differs in the number of electrons they carry.
PLS HELP
Which shows the correct path of how energy flows in a food chain?
A) producer, consumer, predator, decomposer
B) symbiosis, producer, prey, decomposer
С) consumer, predator, carnivore, herbivore
D) niche, consumer, decomposer, chlorophyll
The correct path of how energy flows in a food chain is option A. producer, consumer, predator, decomposer.
Path of energy flows in a food chain?Here the producer gets the energy from the sun and photosynthesis after that it should be eaten by the consumer that is preyed from the predators and after that the last one is a decomposer.
hence, we can conclude that The correct path of how energy flows in a food chain is option A. producer, consumer, predator, decomposer.
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Plzzzz help I need help with this
Answer: c extracting oil
Explanation:
Saudi Arabia is known for there huge oil market
A student repeats a reaction several times to test the effects of various
changes on the reaction rate. The data table shows the results. Based on
these results, how would decreasing the concentration of the reactants
change the reaction rate?
Conditions
Original
Higher concentration
Higher temperature
Metal added
Reaction Time (5)
10 seconds
5 seconds
5 seconds
5 seconds
A. More information is needed to determine what would happen to
the reaction rate.
B. Decreasing the concentration would increase the reaction rate.
C. Decreasing the concentration would decrease the reaction rate.
D. Decreasing the concentration would have no effect on the
reaction rate.
Answer:
C) Decreasing the concentration would decrease the reaction rate.
Explanation:
A.P.E.X
Which model failed to explain the
attraction between some
substances?
the model of Dalton
the model of Thomson
the Bohr-Rutherford model
all of the above
Answer:
C). The Bohr-Rutherford model
Explanation:
The 'Bohr-Rutherford model' of the atom failed to elaborate on the attraction between some substances. It essentially targeted hydrogen atoms and failed to explain its stability across multi-electrons. The nature and processes of the chemical reactions remained unillustrated and thus, this is the key drawback of this model. Thus, option C is the correct answer.
Look at periodic table. Which two elements share similar properties?
Answer: i think
lithium
potassium
Which phrase most accurately describes a chemical change?
Question 7 options:
A change in taste
A change on the molecular level
A change in form
A change in appearance
Answer:
C. it's change in form....
Hope this helps...... Stay safe and have a Merry Christmas!!!!! :D
what is dilution?..............
Answer:
di·lu·tion
the action of making a liquid more dilute.
"the milk factor is greatly reduced by dilution"
which of the following best describe the main function of the cyrculatori system ?
a. to deliver nutrients an other essential material to cells an remove waste products
b. to break down the nutrients found in food so that they can be used by all cells in the humand body
c. to produce the chemical signals that allow parts of the humand body to communicated over long distances
d. to coordinate all others humand body system so that they can function together to maintain homeostaisis
Answer:
D
Explanation:
To coordinate all other human body system so that they can function together to maintain homeostasis
Geologists obtain indirect evidence about Earth’s interior by
a.
measuring pressure differences at Earth’s surface.
b.
estimating temperature inside earth.
c.
directly looking under the many layers.
d.
recording and studying seismic waves.
Answer:
I'm sure it's D.
Explanation:
They obtain evidences by recording and studying seismic waves.
this had me thinking
what is smaller than an atom... is there really anything smaller than an atom??!! i dont think there is is there?
Answer:
the protons, neutrons, and electrons that make up the atom?
Explanation:
1.Which Statement best describes the use of a catalyst in a fuel cell?
A.It reduces waste
B.It lowers energy requirements
C.It reduces toxic exhaust
D.It increases reaction rates
Answer: D. It Increases reaction rates.
Explanation:
Answer:
D. It Increases reaction rates.
Explanation:
5. In which group of elements do most atoms have completely filled s and p velence sublevels? A) halogens B) noble gases C) alkali mctals D) alkaline earth metals
Answer:
It's noble gas & they have filled p sublevels
the answer above isn't complete
Explanation:
pictures below
what does this graph represent?
Answer:Potential and kinetic energy
Explanation:
The Himalayan mountain range found at the junction of India and Asia is an example of a
(1 point)
a.convergent boundary
b.divergent boundary
c.transform boundary
d.normal boundary
Answer: A : Convergent
Explanation:
What is the mass number of an atom containing 35 protons and 45 neutrons?
How many total electrons would that neutral atom contain
What is the element?
Will this element gain or lose electrons?
How many total electrons would an ion of that element have?
What is the charge on that ion (ex. +1,12 2. etc.)?
Is this ion an anion or cation?
What other element has the same number of electrons as the ion you have identified?
No
Answer:
Explanation:
1. Weight = 35 P and 45 N = 80
2. Atom: 35P = 35 electrons
3. Bromine
4. It's a non metal. It's in column 17. It will gain 1 electron (normally).
5. Ion: 35 protons, 36 electrons
6. Charge: - 1 usually, but there are exceptions
7. Anions go to the Anode. The anode attracts minus charged elements.
8. In an uncharged state, element 36 would be next. That would be Krypton which is always uncharged. It is a noble gas.
A sample of a compound contains 3.21 g of sulfur and 11.4 g of fluorine. What is the empirical formula of the compound?
Answer:
[tex] SF_{6}[/tex]
Explanation:
Let the compound be x.
Given the following data;
Sulfur, S = 3.21g
Fluorine, F = 11.4g
Atomic mass of sulfur = 32.07g
Atomic mass of fluorine = 19g
Amount of moles for sulfur;
3.21*(1/32.07) = 0.10mol
Amount of moles for fluorine;
11.4*(1/19) = 0.60mol
We then divide by the smallest to find the ratio;
(0.10/0.10) = 1 Mol of sulfur.
(0.60/0.10) = 6 Mol of fluorine.
Therefore, the ratio of sulfur to fluorine is 1:6.
Compound x = [tex] SF_{6}[/tex]
Hence, the empirical (simplest) formula of the compound is [tex] SF_{6}[/tex]
Helppppppp. much needed help lol
Answer:
Isotope
Explanation:
Isotopes are variants of a particular chemical element which differ in neutron number, and consequently in nucleon number.
what is the chemical name for carbon?
1. Are ions involved in metallic bonding?
2. How are the atoms arranged in a metal? Why?
Answer:
1 ans =The atoms that the electrons leave behind become positive ions, and the interaction between such ions and valence electrons gives rise to the cohesive or binding force that holds the metallic crystal together.
