Answer:
number 1
Explanation:
took the test
14. What are the different types of river in Nepal ?explain them briefly
Answer:
21
Explanation:
PLZ HELP!!!!!! IN YOUR OWN WORDS PLZ! :D
Imagine your cell phone rings. Describe how the sound gets transmitted from your phone to your ear, and then, from your ear to your brain. In your response, be sure to mention the type of wave that a sound wave is, the medium the sound is transmitted through before it gets to your ear, and what happens in your ear once the sound reaches it.
Answer:
SOUND WAVE (carried by thin metal inside the phone) ⇒ELECTRICAL ENERGY (over the wire) ⇒SOUND WAVE (that is heard by someone on the side of the phone)
Explanation:
What is a sound wave?A wave that is comprised of compression and refraction, by which sound is propagated in an elastic medium such as air.
How does sound get transmitted from phone to ear?
The sound waves are carried to a thin metal disk inside the phone, known as the diaphragm, and are converted into electrical energy. The electrical energy travels over wires to another phone and is converted from electrical energy to sound waves again which can be heard by the one on the other end of the phone.
How does sound get transmitted from ear to brain and what happens when sound reaches the ear?Sound waves enter the outer ear and travel through a small passageway (ear canal), which leads to the eardrum.The eardrum vibrates from the coming sound waves and sends these vibrations to three tiny bones in the middle ear. These bones are known as the malleus, incus, and stapes.The bones present in the middle ear amplify the sound vibrations and send these vibrations to the cochlea (the snail-shaped structure that is filled with fluid present in the inner ear). An elastic separation runs from the beginning to the edge of the cochlea, splitting it into upper and lower parts. This separation is called the basilar membrane as it serves as the base on which key hearing structures sit.Once the vibrations result in the fluid inside the cochlea rippling, a traveling wave appears along the basilar membrane. Hair cells (sensory cells) sitting on top of the basilar membrane ride the wave. Hair cells near the broad end of the cochlea detect higher-pitched sounds. Those closer to the center detect lower-pitched sounds, such as a large dog barking.As the hair cells move up and down, microscopic hair-like projections (known as stereocilia) that perch on the peak of the hair cells crash against an overlying structure and bend down. Bending results in pore-like channels, which are at the tips of the stereocilia, opening up. Then chemicals rush into the cells, producing an electrical signal.The auditory nerve carries this electrical signal to the brain, which in return it into a sound that we recognize and understand.In this way, sound reaches our ears.
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This element is in the same family as Br, but has fewer protons than Mg. What is it?
Answer:
Fluorine
Explanation:
It has 9 protons ( Mg has 12 ) and it is in the same family as Br - bromine That is group 7.
HOPE THIS HELPED
Fluorine is the element in the same family as Br, but fewer proton than Mg.
What is Proton ?Proton is positively charged. Proton is a subatomic particle which builds the atom.
Number of proton = Number of electrons = Atomic number
What is Halogen Family ?Halogens are non metallic elements in periodic table. It belongs to group 17 in the periodic table. Halogen family consists six element that is Fluorine, Chlorine, Bromine, Iodine, Astatine and Tennessine.
Magnesium has 12 protons. Fluorine has 9 protons. Chlorine has 17 protons that is much more than the Magnesium. Fluorine belongs the same family that is halogen family as Br.
Thus, we can say that Fluorine is the element in the same family as Br, but fewer proton than Mg.
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A light ray strikes a plane mirror at an angle of 20 degrees to the normal. What is the angle of the reflected light ray to the normal?
20 degrees
0 degrees
40 degrees
70 degrees
Answer:
20 degrees
Explanation:
Applying the second law of reflection,
Second Law of reflection: The law of refelection states that the incident angle, reflected angle.
Mathematically, it can be expressed as
i = r...................... Equation 1
From the question, we were told that the light strik the plane at an angle of 20 degrees to the normal.
Therefore,
i = 20 degrees.
If i = 20 degrees,
then,
r = 20 degrees.
The kinetic molecule theory assumes that the particles of an ideal gas
Explanation:
It is assumed that the particles of an ideal gas have no such attractive forces. The motion of each particle is completely independent of the motion of all other particles. The average kinetic energy of gas particles is dependent upon the temperature of the gas.
if you were givin 2.50 moles of.sodium bromide, how many grams of salt do you have
Answer: 257.23
Explanation:
Steel wool turns from a gray color to a reddish color after it gets wet and then sits on a counter. Is this a sign of a chemical or physical change? PLEASE ANSWER ASAP!
Answer: Steel wool turns from a gray color to a reddish color after it gets wet and then sits on a counter is a sign of chemical change.
Explanation:
A change that brings change in chemical composition of a substance is called a chemical change.
For example, Steel wool turns from a gray color to a reddish color after it gets wet and then sits on a counter is a chemical change.
This is because steel wool is mostly made up of iron and when iron becomes wet then in the presence of air it gets oxidized and therefore, it gets corroded.
This corrosion appears as reddish color of steel wool and it represents a chemical change has occurred in the steel wool.
Thus, we can conclude that steel wool turns from a gray color to a reddish color after it gets wet and then sits on a counter is a sign of chemical change.
Explain what fertilisers are used for.
Gold can undergo transmutation. Superscript 185 Subscript 79 Baseline Upper A u right arrow Superscript 181 Subscript 77 Baseline Upper I r + Superscript 4 Subscript 2 Baseline Upper H e This type of nuclear decay is called .
Answer:
Alpha Decay
Explanation:
Answer:
The answer for this would be Alpha Decay
Explanation:
If this is a late answer I apologize but I hope others may find this helpful :)
Which procedure is an attempt to correct a genetic disorder by replacing a mutated gene with a normal allele?
O selective breeding
• cloning
O artificial selection
•
gene therapy
gene therapy
Explanation:
Gene therapy, also called gene transfer therapy, the introduction of a normal gene into an individual's order to repair a mutation that causes a genetic disease.
Answer:
C artificial selection
Explanation:
Brainly please
(ii) Arrange the following metals in decreasing order of their reactivity:
Fe, Zn, Na, Cu, Ag
Answer:
Given Elements are
Ferrus(Fe)Zinc(Zinc)Sodium (Na)Copper (Cu)Silver(Ag)Decreasing Order:-Na>Zn>Fe>Cu>Ag
Explanation:-Here is the reactivity series of elements to let you understand better .[tex]\setlength{\unitlength}{0.8 cm}\begin{picture}(20,15)\thicklines\put(5,9.5){\large {\boxed{ \sf{Reactivity \: series}}}}\put(0.8,8){\large\sf K \qquad\qquad\qquad Potassium\qquad\qquad\qquad \: maximum}\put(0.8,7.2){\large\sf Na \qquad\qquad\qquad Sodium\qquad\qquad\qquad\quad \: reactivity}\put(0.8,6.2){\large\sf Ca\qquad\qquad\qquad \: Calcium}\put(0.8,5.2){\large\sf Mg\qquad\qquad\quad \: Magnesium}\put(0.8,4.2){\large\sf Al\qquad\qquad\qquad \: Aluminium\qquad\qquad\qquad \: decreasing}\put(0.8,3.2){\large\sf Zn\qquad\qquad\quad\qquad \: Zinc\qquad\qquad\qquad\qquad \:reactivity}\put(0.8,2.2){\large\sf Fe\qquad\qquad\quad\qquad Ferrous}\put(0.8,1.2){\large\sf Pb\qquad\qquad\qquad \: \:\: Lead}\put(0.8,0.2){\large\sf H\qquad\qquad\qquad \: \:Hydrogen}\put(0.8, - 0.6){\large\sf Cu\qquad\qquad\qquad \: Copper}\put(0.8, - 1.5){\large\sf Hg\qquad\qquad\qquad \: Mercury}\put(0.8, - 2.5){\large\sf Ag\qquad\qquad\qquad \: \:Silver}\put(0.8, - 3.5){\large\sf Au\qquad\qquad\qquad \: \: Gold\qquad\qquad\qquad\quad \: \: minimum reactivity}\put(9.3,8.2){\vector(0, - 2){12}}\end{picture}[/tex]
How many moles of Co are needed to produce nine moles of CO2
Answer:
guizzes
Explanation:
guizlet
Answer:
2. 8 moles of carbon dioxide can be produced from 12.5 moles of oxygen. 1 mole of octane can be produced from 8 moles of carbon dioxide gas.
Explanation:
hope this helps :)
Percent yield is the quantity of product actually produced compared to the quantity _______.
a. the limiting reactant
b. volatile materials
c. of expected product
d. the excess reactant
Answer:
Of expected product
Explanation:
Percent yield is the quantity of product actually produced compared to the quantity of expected product and the correct option is option C.
What is the percent yield?Percent yield is the ratio of actual yield divided by theoretical yield multiplied by 100. It gives information regarding the percentage of products formed in the reaction.
Percentage yield = Actual yield / Theoretical yield × 100
Percent yield is very important in the manufacture of products.
Percent yields are understandably less than 100%, however, percent yields greater than 100% are possible if the measured product of the reaction contains impurities that cause its mass to be greater than it actually would be if the product was pure.
Theoretical yield is the expected amount of products formed in the reaction.
Therefore, percent yield is the quantity of product actually produced compared to the quantity of expected product and the correct option is option C.
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Hey fill in the missing temperatures in this chart zoom in if you can’t see it take a screenshot or sum : Please help me will mark brainliest and be geniune .
How much heat, in kilojoules, is needed to raise the temperature of 236 g of silver from 8.5oC to 34.9 °C? (cAg = 0.24 J/g°C)
Answer:
1.49kJ
Explanation:
Using the formula as follows;
Q = m × c × ∆T
Where;
Q = amount of heat (joules)
m = mass (g)
c = specific heat of silver (J/g°C)
∆T = change in temperature (°C)
According to the information given in this question;
mass of Silver (Ag) = 236g
c of Ag = 0.24 J/g°C
initial temperature (T1) = 8.5°C
final temperature (T2) = 34.9°C
∆T = T2 - T1 = 34.9 - 8.5 = 26.4°C
Using Q = m × c × ∆T
Q = 236 × 0.24 × 26.4
Q = 1,495.3 Joules
Amount of heat needed to raise the temperature of Silver (Q) in kilojoules is 1495.3/1000 = 1.4953
Q = 1.49kJ
Given each of the following sets of values for an ideal gas, calculate the unknown quantity.
a) P = 773 mm Hg; n = 0.240 mol; T = 25 C. What is the volume (in L)?
b) V = 635 mL; n = 0.0947 mol; T = 309 K. What is the pressure (in mm Hg)?
c) P = 727 mm Hg; V = 13.3 L; n = 0.393 mol. What is the temperature (in K)?
Answer:
a. 5.77L
b. 700mmHg
c. 395K
Explanation:
Using PV = nRT we can solve these problems where:
P is pressure of the gas in atm (1atm = 760mmHg)
V is volume in liters
n are moles of the gas
R is gas constant: 0.082atmL/molK
T is asbolute temperature in K
a. PV = nRT
V = nRT/P
P = 773mmHg*(1atm/760mmHg) = 1.017atm
T = 25°C+273 = 298K
V = 0.240mol*0.082atmL/molK*298K / 1.017atm
V = 5.77L
b. PV = nRT
P = nRT/V
P = 0.0947mol*0.082atmL/molK*309K/0.635L
P = 0.9216atm * (760mmHg/1atm) = 700mmHg
c. PV = nRT
PV/nR = T
P = 727mmHg * (1atm / 760mmHg) = 0.9566atm
0.9566atm*13.3L/0.393mol*0.082atmL/molK = T
T = 395K
4. Would the ball and cotton hit the ground the same way it does here on Earth on the moon?
Answer:
Technically yes as the mass is constant...
The mass has no effect on the force of gravitation hence the ball and cotton would hit the ground the same way it does here on Earth on the moon.
What is force?Force is defined as a cause which is capable of changing the motion of an object. It can cause an object which has mass to change it's velocity. It is also simply a push or a pull . It has both magnitude as well as direction.Hence, it is a vector quantity.
It has SI units of Newton and is represented by'F'.Newton's second law states that force which acts on an object is equal to momentum which changes with time. If mass of object is constant, acceleration is directly proportional to net force acting on an object.
The concepts which related to force are thrust and torque .Thrust increases the velocity of an object and torque produces change in rotational speed of an object.
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What do you measure in an experiment to determine reaction rate?
Group of answer choices
A. Amount of reactants
B. Amount of products
C. Temperature
D. Time
need these 2 answered asap pls
Answer:
im not a brain wiz but i think 20
Explanation:
What does renewable energy resource mean?
Answer:
Renewable energy is energy from sources that are naturally replenishing but flow-limited; renewable resources are virtually inexhaustible in duration but limited in the amount of energy that is available per unit of time. The major types of renewable energy sources are. Biomass. Wood and wood waste.
Explanation:
Answer:
A renewable resource is one that can be used repeatedly and does not run out because it is naturally replaced.
Explanation:
Why are substances such as coal and gasoline used as fuel sources?
A.They have high kinetic energy, which can be converted into electrical or mechanical
energy
B.They have large amounts of energy stored in the chemical bonds which can be
converted into kinetic energy when combusted
C.They are able to easily make endothermic reactions, which can be harnessed and
converted into mechanical energy
D. None of the above statements are true
Answer:
A.They have high kinetic energy, which can be converted into electrical or mechanical energy
Explanation:
The kinetic energy of the fast-moving water turns turbines, which drive generators that produce electricity. The energy in fossil fuels (coal, oil, gas) is Chemical Potential Energy.
POSSIBLE POINT
An engine cylinder contains 250.0 mL of gas at a pressure of 1.00 atm. As the engine runs, it compresses the cylinder, reducing the volume of the
25.0 mL. What is the new pressure of the gas at this volume?
Answer: The new pressure of the gas at this volume is 10 atm.
Explanation:
Given: [tex]V_{1}[/tex] = 250 mL, [tex]P_{1}[/tex] = 1.00 atm
[tex]V_{2}[/tex] = 25.0 mL, [tex]P_{2}[/tex] = ?
According to Boyle's law, at constant temperature the pressure of an ideal gas is inversely proportional to volume.
Therefore, formula used is as follows.
[tex]P_{1}V_{1} = P_{2}V_{2}[/tex]
Substitute the values into above formula as follows.
[tex]P_{1}V_{1} = P_{2}V_{2}\\1.00 atm \times 250.0 mL = P_{2} \times 25.0 mL\\P_{2} = 10 atm[/tex]
Thus, we can conclude that the new pressure of the gas at this volume is 10 atm.
Why is it appropriate to describe the Sun and its orbiting celestial bodies as a system?
As the bodies present in the gravitational force of sun, so it is appropriate to describe the sun and its celestial bodies as system.
What are celestial bodied?Celestial bodies are those objects which are present in the space not in the land.
In the space all the planets are present in their orbitals under the gravitational force of the sun and do the motion around the sun, because of that force planets are present in the orderly arrangement. Because of the revolution of the earth around the sun, seasons will change on the earth.
Hence, it is appropriate to describe the sun and its celestial bodies as system.
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Studying the decay of radioactive isotopes in dead organisms helps scientists to identify fossilized remains. The ratio of C-12 to C-14 in the atmosphere is 1 x 1012. The table shows this ratio inside the body of three organisms.
C12/C14 Ratio
Organism C12/C14 Ratio
E 8 x 1012
F 1 x 1012
G 4 x 1012
What can most likely be concluded from the above information?
Only Organism F is alive, and Organism G died before Organism E.
Only Organism F is alive, and Organism E died before Organism G.
Only Organism E is alive, and Organism G died before Organism F.
Only Organism E is alive, and Organism F died before Organism G.
Answer:
Only Organism E is alive, and organism G died before Organism F
Explanation:
I did the test and got it right
A container with a fixed volume, filled with hydrogen gas at -104 C and 71.8 kpa is heated until the pressure reaches 225.9 kpa.
What is the temperature of the hydrogen gas in degrees Celsius?
Answer:
Temperature= -327.2 celsius
Explanation:
You can set up an equation:
-104 = x
71.8 225.9
Where on the periodic table are you most likely to find elements that do not react with other elements A) group 1 B) group 2 C) group 17 D) group 18
Answer:
d) group 18
Explanation:
Group 18 on the periodic table consists of noble gasses, which do not chemically interact with other elements.
What are the consequences of NOT wearing a mask?
Calculate the pOH for a solutions with a pH of 12.34. Is the solution acidic or basic?
Answer:
1.66 basic
Explanation:
Name the Scientist
(a) Who discovered nucleus?
(b) Who stated about stationary orbits?
(c) Who discovered canal rays?
(d) Who discovered neutron?
(e) Who said that atoms are indivisible?
(a) What are isobars? Give one example.
(b)Write two differences between isobars and isotopes.
(c) Write any two uses of isotopes.
Answer:
A. Ernest Rutherford
B.Bohr
C. Eugen Goldstein
D.. Santiago Ramon y cajal
E.john Dalton
F.isobars - a line drawn on a weather map connecting points of equal pressure is called isobars.
example.. argon 40
potassium 40
.two differences between isobars and isotopes.
isobars are those elements which have different atomic number but the same mass number. while isotopes are those elements having the same atomic number and different mass number..
two uses of isotopes.
uranium 235 - for nuclear fission and as fuel in unclear reactors.
# an isotope cobalt - used In the treatment for cancer
# an isotope iodine - used in treatment of goiter.
What is the number of first and last vertical column?
Answer:
Modern periodic table has eighteen (18) vertical columns. These are called groups