Friction causes the molecules on rubbing surfaces to move faster, therefore they have more energy. This gives them a greater temperature, and they feel warmer.
What is friction ?The term friction is defined as the resistive force that occurs when two bodies in contact move relative to one another.
Adhesion between body surfaces, and the adhesion is the molecular force that occurs when two materials come into contact with each other are the causes of friction.
Friction is an everyday force that is generated by two surfaces when they are interacting. When these surfaces slide against each other, this interaction increases the thermal energy of the two surfaces.
Thus, Friction causes the molecules on rubbing surfaces to move faster, therefore they have more energy.
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In physical education class, students stand in a straight line against the gym wall. When the teacher blows a whistle, the entire class runs to the other side of the room. Which of the following correctly describes the students’ energy?
A. The students gain potential energy as they run across the gym.
B. The students move from a state of potential energy to one of kinetic energy.
C. The students use kinetic energy both when they are stopped and while they are running.
D. The students do not have energy when they are stopped, but they gain energy by running.
Answer:
D
Explanation:
When dog start running Front of you And you act Already and run away do you think The dog same to your Question
What did sewage treatment in Ancient Rome and 19th century London have in common? How effective was this strategy and why?
Why is human waste hazardous when it enters the water system?
Where does the material that enters a septic system end up and why?
What is now done to wastewater that was not done until more recently?
In what way are the two ways of treating sewage really just ways of recycling?
Yea pretty much
Explanation:
pls answer with a passion and a goal of smartness
Answer:
b
Explanation:
I used my passion and skill for learning to do a quick google search :P
Answer:
The answer is B
Explanation:
If an element has 10 protons and 11 neutrons and 10 electrons, which expression correctly identifies the element? Atomic numbers: Sodium is 11, Neon is 10
Answer:
Explanation:
Firstly, it should be noted that atomic number (number of protons) determines element. And the element with the atomic number 10 (10 protons) is Neon. Hence, Neon-10 (₁₀Ne) is the answer.
Note that sodium has an atomic number of 11. Also, number of protons is usually equal to the number of electrons in neutral atoms, this is because the total number of positive particles (protons) must be equal to the total number of negative particles (electrons) to give a neutral atom.
How many total chlorine atoms are in the formula 4NaCl
Answer:
4 Chlorine atons
Explanation:
4 molecules of NaCl
In NaCl we have only 1 atom of Cl
Therefore in 4 molecules, we have 4 atoms of Cl.
please mark brainliest
There are a total of 4 chlorine atoms in 4 NaCl.
ATOMS:
Atoms is the smallest indivisible particle of an element. An element consists of the same type of atom. To get the number of atoms in an element or compound, we multiply the the number of moles in the element or compound by the number of atoms of the specific element. NaCl consists of sodium and chlorine elements. 4NaCl means there are 4 moles of sodium chloride (NaCl). This means that there are 4 × 1 = 4 atoms of chlorine.Learn more at: https://brainly.com/question/657632?referrer=searchResults
hunter is making a list of phyiscal and chemical properties
A
student lifts a backpack
straight up with a force of
53.5 N for a distance of 0.65 m.
How much work is done on
the backpack
Answer:
53.5 N?
Explanation:
34.77 Joules of work is done on the backpack.
How work-done is calculated?Work-done on any body can be calculated as:
W = F × x, where
F = force
x = displacement or distance
In the question, given that
Force to lift a backpack = 53.5 N
And distance = 0.65 m
Now work-done is calculated as:
W = 53.5 × 0.65 = 34.77 Joules
Hence, 34.77J of work is done.
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look at this image what type of galaxy is shown? A. barred B. elliptical C. irregular or D. spiral.
It is D
SPIRAL............
Answer:
Spiral
Explanation:
I searched up each one and the spiral was the exact picture of that. The irregular galaxy doesn't really have a shape to it. The elliptical galaxy is more smooth and less defined. As in you can't really see as many stars. And the barred galaxy is more oval shaped, kind of like an eye.
A karyotype can be used to determine the number of ____________________ (alleles, chromosomes) in a person’s cells.
Answer:
Chromosomes
Explanation:
A karyotype is an individual's collection of chromosomes
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Jayla
What best describes the bromide ion that forms?
Answer: It is a negative ion that has one more valence electron than a neutral bromine atom.
Explanation: I Hope that helped !!
The element with 8 valence electrons and 5 energy levels.
An gel ice pack getting cold after you put it in the freezer for an hour.
substance change
chemical change
elemental change
physical change
Answer:
physical change
.............
40 g of sodium reacts with ____ g of chlorine to produce 117 g of sodium chloride *
Answer:
9.26g of chlorine
Explanation:
What Determines a atoms reactivity.
A) How many protons the atom contains
B) How many energy levels the atom contains
C) Whether the atom is metal or nonmetal
D) How many valence electrons the atom contains
Answer:
The number of electrons in the outermost shell of an atom determines its reactivity. Noble gases have low reactivity because they have full electron shells. Halogens are highly reactive because they readily gain an electron to fill their outermost shell
Explanation:
does that help
Which of the following is the correct model of C6H14?
B
n-Hexane is a chemical made from crude oil. Pure n-Hexane is a colorless liquid with a slightly disagreeable odor. It is highly flammable, and its vapors can be explosive. Pure n-Hexane is used in laboratories. Most of the n-Hexane used in industry is mixed with similar chemicals called solvents. The major use for solvents containing n-Hexane is to extract vegetable oils from crops such as soybeans. These solvents are also used as cleaning agents in the printing, textile, furniture, and shoemaking industries. Certain kinds of special glues used in the roofing and shoe and leather industries also contain n-Hexane. Several consumer products contain n-Hexane, such as gasoline, quick-drying glues used in various hobbies, and rubber cement. .
The branch of science which deals with chemicals and their bond is called chemistry.
The correct option is B.
The compound given in the question is hexane which has 6 carbon. The ends and the curve in the diagrams represent the carbon position in the image.
So we have to find the option which has 6 carbon.
According to the question, the B image has 6 carbon in it.
Hence, the correct option is B
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An gel ice pack getting cold after you put it in the freezer for an hour.
Answer:
what??
Explanation: That is not a complete question
Sorry
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Isotopes have the same number of ________with different numbers of ________.
My choices
electrons, neutrons, protons
Answer:
electrons, protons i think
Explanation:
How many parts does CsF ( Cesium Fluoride ) have?
why is it called the Solar system?
Answer:
Because it's a system in the solar areas.
Explanation:
Im just tryna sound smart, I actually have no clue
Answer:
The Latin word for the Sun is Sol, so we call this system the Solar System. He showed that it was very likely that all the planets moved around the Sun. This time even more people thought Galileo may be right and that the Earth really did move around the Sun.
Explanation:
There are many planetary systems like ours in the universe, with planets orbiting a host star. Our planetary system is named the "solar" system because our Sun is named Sol, after the Latin word for Sun, "solis," and anything related to the Sun we call solar.
Hope That Helps :0
What is required for two atoms to share electrons equally in a chemical bond?
A. The two atoms must have the same number of valence electrons.
B. The two atoms must both be nonmetals.
C. The two atoms must have equal and opposite charges.
D. The two atoms must be of the same element.
Answer:
D
Explanation:
The two atoms must be of the same element in order for two atoms to share electrons equally in a chemical bond.
What is an element?
An element is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.
Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.
The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with same atomic number are atoms of same element.
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how did quantum mechanics change our understanding of atoms
Answer:
in quantum mechanics, electrons exist in a cloud-shaped area outside the nucleus.
Explanation:
5. Elmer really likes to cook with onions and he puts onions into almost everything he makes. He usually starts dinner every day around 5:00 p.M. As he is cutting the onions, the grandfather clock chimes five times because it is 5:00 p.M. Elmer is also crying because cutting the onions makes his eyes water. One evening he is at a friend's house because they are going out to dinner later. He and his friend are watching TV and the clock chimes five times when it is 5:00 p.M. Elmer's eyes start to water.
Answer and Explanation:
A) Unconditioned Stimulus- The onion
B) Unconditional Response- Crying
C) Conditioned Stimulus- Chiming clock
D) Conditioned Response- Crying
In the above scenario( an example of classical conditioning), Elmer has been conditioned by the continuous iterations of having to cook everyday by 5pm. He cooks with onions by 5pm around the same time his uncle's clock chimes five times. He cries/has teary eyes(unconditioned response) because of the response to the onions(unconditioned stimulus) around the same time the clock chimes five times thereby conditioning his response so that even when the onions isn't there/he isn't even cooking, he tears up to the clock chimes around 5pm. The clock is therefore a conditioned stimulus and there is a conditioned response of crying.
The unconditioned response to an unconditioned stimulus happens naturally(an instinct) because it is a biological response to the onions, not conditioned.
Why is it difficult to detect the presence of isotopes of an element during chemical
studies?
Answer:
Isotopes are atoms that have different number of neutrons, so they have a different mass number than the other atoms in an element.
The trade route that connected India to markets in Europe and the Arabian
Peninsula was the:
A. Indian Ocean trade network.
B. Silk Road trade network.
C. trans-Saharan trade network.
D. Songhai trade network.
Answer:
It is NOT B (Silk Road trade network), I repeat NOT B, but I think it could be A (Indian Ocean trade network)
Explanation:
I took the quiz and chose B (Silk Road trade network) and it was INCORRECT. As for A (Indian Ocean trade network), I looked back at the lesson and it doesn't mention anything about D (the Songhai trade network), which rules that one out, so now it's between A and C. I don't think it's C (trans-Saharan trade network) because although it was near the Arabian Peninsula, it said that it trades with civilizations in the Saharan Desert and people who live near the Mediterranean Sea. It also said nothing about trading with Europe (Roman Empire at that time) along the trans-Saharan trade network. So that's why I'm thinking it could be the Indian Ocean trade network because 1. it's the only one that makes sense after we've ruled out the others 2. It traded with the Arabian Peninsula, and since it traveled over water, I'm thinking it could've gotten to Europe. Then again I could be wrong, but keep these in mind while answering.
Answer:
A
Explanation:
Took the test and got it right
When you sweat a lot the water content of your blood can drop. Your cells have to maintain a certain level of water and salt in order to function properly. Which systems work together to help maintain homeostasis.
Answer:
Explanation:
There are key organs and system that assist in ensuring the body maintains homeostasis in the case of water-salt balance.
The excretory system: When one sweats, a lot of water content of the blood can drop (this is what causes the individual to be thirsty). In order to maintain a certain water-salt balance, the excretory system passes some salt out of the body in the form of urine (this is the reason the urine is usually yellowish but small in volume during the summer).
Endocrine system: When water content of the blood drops, vasopressin (also called antidiuretic hormone) is released into the bloodstream stimulating the kidneys to conserve water and release less urine (as said earlier). However, if the body is hydrated, less vasopressin is released and more water is passed in the urine.
2 points
2. CsH&BrCl is a compound. What is the ratio of carbon to bromine atoms
in the molecule?
O 1:1
1:3
O 1:6
3:1
3:6
61
361
Answer: The ratio of carbon to bromine atoms in the molecule is 3:1
Explanation:
Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass. It can be decomposed into simpler constituents using chemical reactions.
Chemical formula shows the elements in a compound and the relative proportions of those elements.
The chemical formula given for the compound is [tex]C_3H_6BrCl[/tex] which means the ratio of carbon to bromine atoms is 3: 1.
Thus the ratio of carbon to bromine atoms in the molecule is 3:1
Be sure to answer all parts.The equilibrium constant Kc for the reaction below is 61.5 at a certain temperature. H2(g) + I2(g) ⇆ 2HI(g) If you start with 0.155 M hydrogen iodide, what will the concentrations of H2, I2, and HI be at equilibrium?
Answer:
[tex][I_2]=[H_2]=0.0157M[/tex]
[tex][HI]=0.124M[/tex]
Explanation:
Hello!
In this case, for the undergoing chemical reaction, we can write the equilibrium expression as shown below:
[tex]Kc=\frac{[HI]^2}{[I_2][H_2]}[/tex]
However, since the reactions starts with 0.155 M hydrogen iodide, we need to invert the reaction as well as the equilibrium expression:
[tex]2HI\rightarrow I_2+H_2[/tex]
[tex]\frac{1}{Kc}=0.0163 =\frac{[I_2][H_2]}{[HI]^2}[/tex]
And each concentration at equilibrium in terms of the reaction extent is:
[tex][I_2]=[H_2]=x[/tex]
[tex][HI]=0.155-2x[/tex]
Thus, plugging in the new expression we write:
[tex]0.0163 =\frac{x*x}{(0.155-2x)^2}[/tex]
Which has the following valid solution for [tex]x[/tex]:
[tex]x=0.0157M[/tex]
Because the other solution is negative. Therefore, the concentration of hydrogen, iodine and hydrogen iodide at equilibrium turns out:
[tex][I_2]=[H_2]=0.0157M[/tex]
[tex][HI]=0.155-2(0.0157)=0.124M[/tex]
Best regards!
At the equilibrium, the concentration of hydrogen and iodine has been 0.0157 M each, and the concentration of HI will be 0.124 M.
The initial concentration of the reactant has been 0.155 M. From the balanced chemical equation, the ICE table will be:
HI [tex]\rm H_2[/tex] [tex]\rm I_2[/tex]
I 0.155 0 0
C -2x x x
E 0.155 - 2x x x
The value of the equilibrium constant can be given by the ratio of the concentration of products to the reactant.
The equilibrium constant for the reaction will be:
[tex]\rm k_c\;=\;\dfrac{[H_2]\;[I_2]}{[HI]^2}[/tex]
The given constant value has been for the opposite reaction. Thus the constant for the required reaction has been :
[tex]\rm \dfrac{1}{given\;k_c} \;=\;\dfrac{[H_2]\;[I_2]}{[HI]^2}[/tex]
[tex]\rm \dfrac{1}{61.5}[/tex] = [tex]\rm \dfrac{(x)\;(x)}{(0.155-2x)^2}[/tex]
0.0162 = [tex]\rm \dfrac{x^2}{(0.155-2x)^2}[/tex]
By simplyfying the equation,
x = 0.0157 M
At the equilibrium, the concentration of hydrogen and iodine has been 0.0157 M each.
The concentration of HI will be:
HI = 0.155 - 2x
HI = 0.155 - 2(0.0157)
HI = 0.124 M.
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A teacher did an experiment to show the movement of particles in solids, liquids, and gases. The experiment is shown below. The teacher pulled the string attached to the stretched balloon, first slowly. Then fast and finally vigorously
Answer:
This question is incomplete. However, the completed question is below
A teacher did an experiment to show the movement of particles in solids, liquids, and gases. The experimental set-up is shown below: An inverted glass jar is shown. Small circles representing foam balls are shown inside the jar. A stretched balloon is shown tied at the mouth of the jar. A string is shown drawn out from the middle of the stretched balloon. A hand is shown pulling the drawn out string. The teacher pulled the string attached to the stretched balloon, first slowly, then fast, and finally vigorously. Which of the following is most likely correct about the pulling of the string and the corresponding state of matter being represented? (a) Gas is represented when pulled fast, solid when pulled slowly, liquid when pulled vigorously. (b) Gas is represented when pulled slowly, liquid when pulled fast, solid when pulled vigorously. (c) Solid is represented when pulled slowly, liquid when pulled fast, gas when pulled vigorously. (d) Solid is represented when pulled vigorously, liquid when pulled fast, gas when pulled slowly.
The correct answer is C
Explanation:
These question has to do with the "freedom" of particles in each state of matter. In solids, the particles are compact and do not move freely within the solid molecule hence the reason for the definite shape of solid. The particles of liquids move more freely than solid but not as much as gases, hence the reason for there free flowing nature. Particles of gases move more fast and rapidly; colliding against one another and the wall of the container.
From the above description, it can be deduced that to illustrate these particles the teacher will have to represent the particles of the solid as been moved slowly, particles of the liquid will be pulled fast and that of gas will be pulled vigorously using balloons. Thus, the correct option is C
Answer:
the correct answer is c!
Explanation:
Solid is represented when pulled slowly, liquid when pulled fast, gas when pulled vigorously.
What is the volume of 8.80 g of CH4 gas at STP?
Answer:
12.32 L.
Explanation:
The following data were obtained from the question:
Mass of CH4 = 8.80 g
Volume of CH4 =?
Next, we shall determine the number of mole in 8.80 g of CH4. This can be obtained as follow:
Mass of CH4 = 8.80 g
Molar mass of CH4 = 12 + (1×4) = 12 + 4 = 16 g/mol
Mole of CH4 =?
Mole = mass/Molar mass
Mole of CH4 = 8.80 / 16
Mole of CH4 = 0.55 mole.
Finally, we shall determine the volume of the gas at stp as illustrated below:
1 mole of a gas occupies 22.4 L at stp.
Therefore, 0.55 mole of CH4 will occupy = 0.55 × 22.4 = 12.32 L.
Thus, 8.80 g of CH4 occupies 12.32 L at STP.
What is base unit used to measure volume?
Answer:
SI unit
Explanation:
the base unit of volume in the SI system is the cubic meter
Answer:
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Explanation:
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