Identify the reactants and products in each of the following reactions: sodium +carbon > sodium hydroxide +hydrogen
Answer:
Hydrochloric acid and sodium hydroxide interact, resulting in salt and a release of heat. As we can see, the result of the interaction of two highly aggressive compounds is table salt and water – compounds that are ultimately harmless, even beneficial, to human beings.
Explanation:
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Which statement describes the differences between nuclear reactions and chemical reactions?
Nuclear reactions involve changes to electrons, while chemical reactions involve changes to protons and neutrons.
Only chemical reactions can be exothermic.
Chemical reactions can result in new compounds, while nuclear reactions can result in new elements.
Answer:
c on ed
Explanation:
A beam of light with a wavelength of 4.0 millimeters is shot at an opaque barrier with four different-sized holes. Which hole will cause the light to diffract to the greatest degree?
Answer:1mm
Explanation:
Identify the products of this single-replacement reaction between sulfuric acid and aluminum. Then balance the equation
___H2SO4 + ___Al → ___ + ___
Answer/Solution
I hope it help.
Aluminium is far powerful and reactive than hydrogen so it will displace H_2 easily.
The reaction becomes
H_2SO_4+Al—»Al_2(SO_4)_3+H_2Balanced reaction
3H_2SO_4+2Al—»Al_2(SO_4)_3+3H_2what is a ravine and why are they made
A ravine is a smaller version of a canyon that is typically formed by stream bank erosion. Ravines are greater in scale than gullies, but smaller than valleys.
What is ravine?A ravine is a slope landform with relatively steep sides,Ravines may or may not contain active streams running along the down slope channel that produced them.
Ravine are frequently characterized by intermittent streams, since their geographic size is too small to maintain a perennial watercourse.
Hence, a ravine is a smaller version of a canyon that is typically formed by stream bank erosion.
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How do you break apart a
compound?
A. Chemical bonds must be broken,
B. Water must be added.
C. It must be physically separated.
D. The compound can be cut apart,
Answer:
B
Explanation:
Depends Mostly on bonds electrolysis can be used, chemical bonding like additional of water or by heating back to their elements.
Why do we need to improve cardiovascular fitness and muscular endurance?
Learning Task 2 B: Check () the skills that correspond to the activities. Copy the table in your activity notebook.
Activities
Cardiovascular
Fitness
Muscular
Endurance
1. aerobics or step aerobics
2. leg lifts
3. jump rope
4. line jumps
5. curl-ups
6. bench-steps
7. follow the leader runs
8. push-ups
ocess Questions:
1.
How do you find these activities? Explain.
2. How did you classify if the activity is cardiovascular fitness and muscular endurance?
3. In your word, define cardiovascular fitness and muscular endurance.
#1
These are two types of activities either muscular or cardiovascular.
#2
They are differing in the muscles they target ,Either cardio else others.
#3
Cardiovascular fitness is the fitness of our heart's muscular.Doing cardio workouts can be quite helpful in maintaining that fitness level
Muscular endurance denotes to strengthen of muscles like biceps ,knees ,ankles ,abs etc .
another word for iron oxide?
Answer:
Hydrated iron(III) oxide, or ferric oxide
Explanation:
List four conditions that may result in the emission of electrons from a conductor.
Answer:
1 Conditions that result in the emission of electrons from a conductor:
Heating the conductor to a suitable temperature
Exposing the conductor to a strong light
Subjecting the conductor to a very high applied voltage
Subjecting the conductor to high-speed electrons from another source
2 Both diodes and triodes influence current flow and contain electrodes. Diodes involve only two active pieces; triodes contain three electrodes within a tube. Current can flow through a diode in only one direction. Diodes tend to act as rectifiers. In a triode, the third electrode is a grid located between the cathode and the anode. A small difference of potential between the grid and the cathode controls the number of electrons that reach the anode. Adjusting the charge on the grid affects the number of electrons that can reach the anode. Triodes tend to act as amplifiers.
3 a Transmitting antenna
b Modulator
c Oscillator
d Microphone
4 a RF amplifier
b Receiving antenna
c Loudspeaker
d Demodulator
e Tuner
5 hue, saturation, intensity/brightness
6 red, blue, green
Explanation
PF right from PF all 6 answers
There are four main ways in which electrons are emitted from the conductor including Thermionic emission, Electric field electron emission, Photoelectric emission, and Secondary emission.
What is a conductor?A conductor is a substance or material which allows electricity to flow through it. In a conductor, the electrical charge carriers, usually electrons or ions or charged particles, move easily from one atom to another atom when the voltage is applied.
Thermionic emission involves large amount of external energy in the form of heat is supplied to release free electrons from the metal.
In the electric field electron emission, electrons are emitted from the metal surface when the metals are placed in a very strong electric field.
During photoelectric emission, light is absorbed by the metals and this provides energy to the valence electrons in the conductor which break their bond with the parent atom and which are then released from the atom.
Valence electrons have kinetic energy, however they don't have enough energy to escape from the atom. During secondary emission, a high-speed electron from the conductor is bombarded with an atom, which provides energy for the valence electrons to break their bonds with their parent atom which are then released from the atom.
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Ben created the table below to identify the roles of
different parts of the eye.
Part
Role
Cones
provide color visions through three
types of cells
Lens
focuses light to form an
upside-down, virtual image
Iris
adjusts the size of the pupil to
control the amount of light
receives image of the object and
contains cells that detect light
Retina
Which describes Ben's error?
There is a single type of cone cell.
The lens forms a real image.
The iris is a hole through which light passes.
The retina carries the signals to the brain.
Answer:
the answer is The lens forms a real image.
Explanation:
got it right on edge
Think of a career that is obsolete (no longer exists). Explain why the career is no longer needed.
Answer:
here
Explanation:
Lector
Resurrectionist
Switchboard Operator
Log Driver
milkmen
Lamplighter
Ratcatcher
Pre-radar Listener
ice cutter
human alarm clock
bowling pin setter
2. What do you understand by balanced and unbalanced force
Balanced forces are forces that do not result to change in motion while unbalanced forces are forces that result to change in motion.
What is force?Force is defined as the product of mass and acceleration of an object. That is Force = mass × acceleration.
Balanced force is a type of force that do not result to change because the forces are equal in size and opposite.
Unbalanced force is a type of force that result to change because forces on the opposite sides are not equal.
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Can someone please answer this, ill give you brainliest Would be very appreciated.
Answer:
Option 2
Explanation:
When something is acidifying on the pH scale, it generally means the pH is decreasing. Hence, the correct option for the question is :
The ocean pH is decreasingOcean acidification means the acidity of the ocean water is increasing
We know according to pH scale
pH<7 is acidicSo
the pH of oxygen is tending to 1 which is most acidic .
Ocean pH is decreasing (B)I need some help with this question
the answer for number 2 is B
The two principal sources for the internal heating of terrestrial planets are accretion and radioactivity. radiation and convection. convection and radioactivity. convection and accretion. accretion and eruption.
The three principal sources of internal heat of terrestrial planets accretion and radioactivity. Option A is correct.
What is heat transfer?The term "heat transfer" refers to the movement of heat. The flow of heat across a system's boundary is due to a temperature differential between the system and its surroundings.
The three principal sources of internal heat of terrestrial planets accretion and radioactivity.
Option A is correct.
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What is the acceleration of a train that takes 22 seconds to go from a speed of 73 kilometers per hour to a speed of 45 kilometers per hour?
The acceleration of a train that takes 22 seconds to go from a speed of 73 kilometers per hour to a speed of 45 kilometers per hour is 0.354 m/s².
What is acceleration?
Acceleration: the rate at which the speed and direction of a moving object vary over time. A point or object going straight ahead is accelerated when it accelerates or decelerates.
Even if the speed is constant, motion on a circle accelerates because the direction is always shifting.
Acceleration is a change in velocity divided by a change in time. Given the time of 22 seconds and the distance is 73 kilometers. The speed is 45 k/h
(73 - 45 ) = 28 km / hr
Change in velocity = 7.778 m/s
7.778 m/s / 22 s = 0.354 m/s².
Therefore, the acceleration of a train is 0.354 m/s².
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Answer:
Below
Explanation:
73 km / hr = 20.277 m/s and 45 km/hr = 12.50 m/s
Acceleration = change in velocity / change in time
(12.5 - 20.277) m/s / 22 s = - . 354 m/s^2
( NOTE the negative sign....this is a DEceleration)
A 100 kg object moving at 20 m/s comes to a stop over a distance of 40 m. what is the coefficient of kinetic friction between the object and the ground? (show work please)
Answer:
.5097
Explanation:
Original KE = 1/2 (100)(20)^2 = 20 000 J
the force of friction must work this hard to stop the object in 40 m
Ff *40 = 20 000
Ff = 500 = Fn u u = coeff of kinetic friction
500 = (100)(9.81) u
u = .5097
The kinetic friction coefficient between the object and the ground is 0.5097.
What is kinetic friction?The friction force to normal force ratio experienced by a body moving on a dry, non-smooth surface is denoted by the kinetic friction coefficient k.
Formula :
μk = [tex]\frac{Ff}{Fn}[/tex]
The types and values of the coefficient of friction are determined by the type of resistive force. The coefficient of friction can be determined through experiments such as calculating the amount of power required to overcome friction or calculating the angle at which an object begins to slide off an incline. The kinetic friction coefficient, or k, is the ratio of friction force to normal force felt by a body moving on a dry, uneven surface. Friction can be classified as static, kinetic, deformation, molecular, or rolling. Each one has a different coefficient of friction. Kinetic friction is the force that prevents normal motion after static friction has been overcome.Therefore,
Original KE = 1/2 (100)(20)^2 = 20 000 J
the force of friction must work this hard to stop the object in 40 m
Ff × 40 = 20 000
Ff = 500 = Fnμ μ = coeff of kinetic friction
500 = (100)(9.81) μ
μ = 500/(100 x 9.81)
μ = .5097
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how frequently should a thermometer be calibrated for accuracy
Answer:
Well before every single shift.
Explanation:
I acutally learned this yesterday
Select the correct answer from each drop-down menu. a tourist bus is carrying passengers from the bottom of a hill to the top. the people, the bus, and the luggage can be analyzed as a single . the total amount of energy in the system as the bus travels. this situation happens because some of the kinetic energy changes to energy because of friction between the tires and the road.
The correct answer from each drop-down menu are in this case:
systemdecreasesthermalWhat are the forms of energy conservation?In a given mechanical system, in which forms of energy related to electromagnetic or thermal phenomena are not present, it can be said that the total energy of the system is purely mechanical. Thus, the Principle of Conservation of Energy implies the conservation of mechanical energy.
This, in turn, is the sum of the amounts of kinetic energy and various forms of potential energy (gravitational and elastic among them). Although mechanical energy is always constant, the amount of each of its components can change such that the total energy remains constant.
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One light ray labeled a striking a boundary with two light rays labeled b and c reflecting off. c is at the same angle and b is at an angle smaller than a. light ray d is into the material at the same angle of a and e into the new material is at a much larger angle. which pair shows the law of reflection? a and b a and c a and d a and e
Answer:
A & C
Explanation:
Answer:
A and C
Explanation:
Why is it important to be careful interpreting absolute ages of clastic sedimentary rocks such as sandstones?
Answer:
You need to be careful when finding the true age of sedimentary rocks to understand its full history.
Explanation:
1. In what direction does the Earth rotate?
2. How long does it take for the Earth to complete one rotation?
3. What causes day and night?
4. Why is it daytime on one side of the Earth and nighttime on the other side?
5. Is Earth’s rotation important? Explain your answer.
Answer:
In what direction does the Earth rotate?Earth rotates eastward, in prograde motion. As viewed from the north pole star Polaris, Earth turns counterclockwise.
How long does it take for the Earth to complete one rotation?The time it takes Earth to rotate so the sun appears in the same position in the sky, known as a solar day, is 24 hours. However, the time it takes Earth to complete one full rotation on its axis with respect to distant stars is actually 23 hours 56 minutes 4.091 seconds, known as a sidereal day.
What causes day and night?Earth's axis is an imaginary pole going right through the center of Earth from "top" to "bottom." Earth spins around this pole, making one complete turn each day. That is why we have day and night, and why every part of Earth's surface gets some of each. Earth has seasons because its axis doesn't stand up straight.
Why is it daytime on one side of the Earth and nighttime on the other side?Earth and sun are part of the solar system, with the sun at its centre. An Earth day is 24 hours because the Earth spins on its axis once every 24 hours. At any one time half of the Earth's sphere is in sunlight (day) while the other half is in darkness (night).
Is Earth’s rotation important? Explain your answer.The Earth's axis runs from the North Pole to the South Pole. It takes the Earth 24 hours, or one day, to make one complete rotation around this invisible line. As the Earth rotates, each area of its surface gets a turn to face and be warmed by the sun. This is important to all life on Earth
What is the speed of a wave with a frequency of 10 Hz. and a wavelength of 10 m? (Show Work)
Answer:
100m/s
Explanation:
speed of wave=frequency × wave length
=10 × 10
=100m/s
Answer:
100 m/s
Explanation:
Formula :
Wave speed (m/s) = Frequency (s⁻¹) x Wavelength (m)Solving using the given values :
Wave speed = 10 Hz x 10 mWave speed = 100 m/s50 joules of energy are transferred out of a system. The energy is lost through heat, mechanical, and electrical energy took up 15 j and electrical energy took up 10 j, how many joules were lost through heat energy?
Answer:
25 joules
Explanation:
Not sure I understood correctly but since 15 are taken up by mechanical energy and 10 are taken in by electrical, 50-10-15 would result in 25 joules which must belong to heat energy
A sound wave has a speed of 345 m/s and a wavelength of 4.15 meters. what is the frequency of this wave?
a. 83 hertz
b. 67 hertz
c. 125 hertz
d. 145 hertz
Answer:
a is the correct answer
from the formula of wave length=v/f
therefore f= v/wave length
these implies f= 345/4.15 = 83.1hertz
Water’s property of surface tension is due to _____.
A. capillary action
B. solubility
C. cohesion
D. adhesion
E. All of the above
Explanation:
It is due to cohesion (option C)
Select the correct sentences on the image.
Matthew throws a ball straight up into the air. It rises for a period of time and then begins to drop. At which points in the ball's journey will
be the greatest force acting on the ball?
Answer:
when the ball falls down
Explanation:
because gravity is a very strong Force
Answer:
a
Explanation:a
A 12 v battery produces a current of 25 amps. What is the resistance
Please help me
Answer:
The resistance is 2 ohms
compare charging by rubbing and charging by sharing
Charging by rubbing needs physical contact, and charging by sharing does not need any contact.
What is the charge?When the matter is put in an electromagnetic field, it has an electric charge, which causes it to experience a force. Similar charges repel each other, whereas dissimilar charges attract each other.
An electrical charge is created when two distinct insulating materials are rubbed together.
Charge sharing is a signal degradation phenomenon that occurs when charges are transferred from one electronic domain to another.
Electrostatics is the phenomenon of charging by rubbing, whereas induction is the phenomenon of charging by sharing.
Hence, charging by rubbing needs physical contact, and charging by sharing does not need any contact.
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Two bowling balls each have a mass of 8.3 kg. They are located next to each other with their centers 0.165 m apart. What gravitational force do they exert on each other
Hello!
We can use the equation of Newton's Law of Universal Gravitation to solve for the Force of Gravity:
[tex]F_g = \frac{Gm_1m_2}{r^2}[/tex]
Fg = Gravitational Force (N)
G = Gravitational Constant (6.67 × 10⁻¹¹ Nm²/kg²)
m1, m2 = masses (both 8.3 kg in this situation)
r = distance between the center of masses of the objects (0.165 m)
Plug in the given values and solve.
[tex]F_g = \frac{(6.67 \times 10^{-11})(8.3)(8.3)}{(0.165^2)} = \boxed{1.6878 \times 10^{-7} N}[/tex]
