Answer : The correct option is, (C) [tex]N_2O_4(g)\rightarrow N_2(g)+2O_2(g)[/tex]
Explanation :
Decomposition reaction : It is a type of reaction in which a single compound decomposes into two or more new compounds.
The decomposition of dinitrogen tetraoxide into nitrogen gas and oxygen gas is shown by balanced chemical equation.
The balanced decomposition reaction will be,
[tex]N_2O_4(g)\rightarrow N_2(g)+2O_2(g)[/tex]
By the stoichiometry, 1 mole of dinitrogen tetraoxide decomposes into 1 mole of nitrogen gas and 2 moles of oxygen gas.
Hence, the correct option is, (C)
Summarize the main ideas of Dalton’s atomic theory
Dalton's atomic theory states that matter is made up of atoms, which are indivisible. These atoms are identical within an element and different across elements. They combine in specific proportions to form compounds and in chemical reactions, they are rearranged but not created or destroyed.
Explanation:John Dalton’s atomic theory includes several primary ideas. The first is that all matter is composed of atoms, which are small, indivisible particles. Secondly, atoms of the same element are identical to each other in terms of mass and properties, while atoms of different elements are different. Thirdly, atoms combine in specific proportions to form compounds. Lastly, in chemical reactions, atoms are rearranged but they are not created, destroyed or changed into atoms of another element.
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In object of mass 30 kg is in freefall in a vacuum where there is no air resistance determine the acceleration of the object
If enough heat was REMOVED from B, it would change into ____________.
A.) a gas
B.) plasma
C.) a liquid
D.) a solid
Answer:
D
Explanation:
If you take heat away from a liquid it would turn into a solid, therefor being D a solid
Hope this helps :)
A (n)________ is a material that does not conduct heat well
A neutral atom of aluminum has 13 protons and ______ electrons. (Enter a whole number.)
How long would it take you to hop 30 meters if you hopped 5 m/s?
To hop 30 meters at a rate of 5 meters per second, it would take 6 seconds, calculated using the formula t = d/v where t is time, d is distance, and v is velocity.
Explanation:If you hopped at a rate of 5 meters per second (m/s), to cover a distance of 30 meters, you would use the basic formula for distance, which is distance equals speed times time (d = vt). Here, you want to find the time (t), so you rearrange the formula to t = d/v.
Substituting in our known values gives us t = 30 m / 5 m/s, which simplifies to t = 6 seconds. Therefore, it would take you 6 seconds to hop 30 meters at a speed of 5 m/s.
The baking soda looked like it dissolved in the vinegar. Sarah and Connor watched as the balloon expanded and filled with a gas. Was this a physical or chemical reaction and why? A) chemical - gas produced B) physical - water bottle got hot C) physical - baking soda dissolved D) chemical - baking soda disappeared
Answer: A) chemical - gas produced
Explanation: Physical change is a process in which there is no change in chemical composition of the substance.
Chemical change is a process in which there is a change in chemical composition of the substance.
Chemical process is accompanied by following changes
1. Change in color
2. Absorption or release of energy
3. Production of gas
4. Formation of precipitates.
Thus a chemical reaction is happening on mixing baking soda [tex](NaHCO_3)[/tex] and vinegar [tex](CH_3COOH)[/tex], there is production of [tex]CO_2[/tex] which expanded the balloon.
[tex]NaHCO_3+CH_3COOH\rightarrow CH_3COONa +CO_2(g)+H_2O[/tex]
The unit of length that most nearly matches the width of your finger?
You push a coin across a table. The coin stops. How does this motion relate to balanced and unbalanced forces?
Answer the question below based on the periodic table entry for silicon. What is the atomic mass? 2 14 28 28.08
false lies forgive me Based on the periodic table entry for silicon, the atomic mass of silicon is 28.08.
28.08
Explanation;The atomic mass of a given element is the sum of the masses of its isotopes, each multiplied by its natural abundance. Isotopes are atoms of the same element with the same atomic number but different mass number. Atomic number on the other hand is the number of protons in the nucleus of an atom.Silicon is an element in group 4 in the periodic table, it has an atomic mass of 28.08. It has an atomic number 14, which means it has 14 protons in the nucleus of its atom, and thus it has 14 electrons in the energy levels, and therefore, its electronic configuration is; 2:8:4.What speed is a car going if it takes 2 hours to go 80 miles?
The larger the push, the larger the change in velocity. This is an example of Newton's Second Law of Motion which states that the acceleration an object experiences is _____ .
Which benefit of stretching makes you more comfortable when you move around?
Answer:
Stretching refers to the physical exercise in which a specific muscle or muscle group is deliberately flexed or extended.
It improves the elasticity and tonicity of the muscles.
Benefits of stretching may include:
It reduces the muscle tension It increases range of motion of the joints It enhances the muscular coordination It increases the blood circulation to various parts of the body .Blood circulation increases the energy of the muscles.1. The variable ______________ describes how quickly something moves. a) time c) speed b)position d) mass
a sprinter's whose mass is 70 kg accelerstes from rest to 11 m/s in 6 seconds what is the acceleration what force did this require
Final answer:
The acceleration of the sprinter is approximately 1.83 m/s², and the force required to accelerate the sprinter is approximately 128.1 N.
Explanation:
The acceleration of a sprinter can be calculated using the formula:
acceleration = (final velocity - initial velocity) / time
Given that the sprinter's mass is 70 kg, the final velocity is 11 m/s, and the time taken is 6 seconds, we can substitute these values into the formula:
acceleration = (11 m/s - 0 m/s) / 6 s = 11 m/s / 6 s ≈ 1.83 m/s²
The force required to accelerate the sprinter can be determined using Newton's second law of motion:
force = mass x acceleration
Substituting the mass (70 kg) and acceleration (1.83 m/s²) into the formula:
force = 70 kg x 1.83 m/s² ≈ 128.1 N
calculated the gravitational potential energy of a 93.0 kg sky diver who is 550 m above the ground
Final answer:
The initial gravitational potential energy of a 93.0 kg skydiver at 550 m above the ground is 501,090 Joules.
Explanation:
The initial gravitational potential energy ([tex]PE_g[/tex]) of a 93.0 kg skydiver when they are 550 m above the ground can be calculated using the formula
[tex]PE_g[/tex] = mgh, where 'm' is mass, 'g' is the acceleration due to gravity (9.8 m/s2), and 'h' is the height above the ground. So the initial gravitational potential energy
[tex]PE_g[/tex] = (93 kg) × (9.8 m/s2) × (550 m) = 501,090 Joules (J).
Redshift means stars and galaxies are emitting a color that is shifting toward the red end of the color spectrum. this indicates the light's wavelengths are _____ and less frequent, and the star or galaxy is____?
Answer:
Redshift means stars and galaxies are emitting a color that is shifting toward the red end of the color spectrum. this indicates the light's wavelengths are MORE and less frequent, and the star or galaxy is MOVING AWAY
Explanation:
As we know that by Doppeler's effect of light when source is moving away from the observer then the frequency observed by the observer is given as
[tex]\frac{\Delta \nu}{\nu} = \frac{v}{c}[/tex]
so here on moving away the frequency observed by observer will decrease and hence we can say that the wavelength of light must be increased
So here on increasing the observed wavelength we say it to be shifted towards higher side which means it is red shift
so here correct answer would be
Redshift means stars and galaxies are emitting a color that is shifting toward the red end of the color spectrum. this indicates the light's wavelengths are MORE and less frequent, and the star or galaxy is MOVING AWAY
In your own words, explain how Doppler radar works. Describe the properties of electromagnetic waves and interactions that make Doppler radar possible. (13 points)
If you stand up in a big room and echo, your voice will echo from the walls. As long as the room is empty. Since the speed of sound is constant, depending on air density, the more humid the air the faster and farther sound travels. The speed of sound is constant, you could measure the time it takes for your voice to echo off the walls. The same thing happens with Doppler radar, but it’s not voice, it has higher frequency signals.
Doppler Radar uses Doppler Effect as a principle to measure velocities, detect the presence of objects, identify meteorological phenomena and their intensity levels. This radar emits a continuous radio signal that allows the radar to differentiate between objects that are stationary and those in motion. This radar can be used, for example, to measure the speed of a particular object and to indicate its location, so that it is widely used in traffic surveillance.
Doppler radar is the most widely used type of weather radar that is currently of utmost importance for atmospheric monitoring. It is also employed for example in agriculture, air traffic and weather forecasting. Information gathered by radar assists meteorologists in early diagnosis of natural disasters.
Doppler effect, used by these radas, is a physical phenomenon observed in waves emitted or reflected by a source. It is perceived, for example, when listening to the sound of an ambulance passing by an observer. As the ambulance approaches, the tone becomes more and more acute, and as it moves away it becomes more serious. What happens is that we perceive a relative frequency, which is not the same frequency as the wave was emitted.
Difference between Daniel and Leclanché cells
Explanation :
Daniel cells:
It is a primary cell. It consists of a zinc rod and a copper vessel (in fig 1). It can be seen that a zinc rod is put in dilute sulfuric acid which is contained in a porous pot.
Daniel cell works on the principle of the redox reaction. The electrons pass form zinc rod to wire. Then it passes to the copper rod. Thus, a current is produced.
It produces an EMF of 1 volt.
Leclanche cell :
Leclanche cell is also known as dry cells (fig 2). It contains an electrolyte of ammonium chloride. Carbon acts as a cathode while zinc is an anode.
It produces an EMF of 1.4 volts.
Answer:
Explanation:
A Leclanche cell consists of a carbon electrode packed in a porous pot containing manganese dioxide and charcoal powder (Fig 2.22). The porous pot is immersed in a saturated solution of ammonium chloride (electrolyte)
Which of these is a pure substance?
a. diamond
b. salt
c. ocean water
a
a and b
b and c
all of them
Answer:
The correct answers are A and B. Diamond and salt are pure substances.
Explanation:
A pure substance is one whose composition does not vary, even if the physical conditions in which it is found change. For example, water has a formula that is H2O and is always the same, which indicates that it is made up of molecules in which there are 2 hydrogen atoms and 1 oxygen atom. If I changed that formula, it would be another different substance.
A pure substance cannot be broken down into other simpler substances using physical methods.
A pure substance has its own or defined characteristic properties.
Through which of these media do sound waves travel most slowly? A.iron. B.Wood. C.Water. D.Cold Air
Among the given materials, sound waves will slowly passes through water. Because, water is denser than a wood, air and a metal. Thus option C is correct.
What are sound waves?Sound waves are mechanical waves that are energy transfer through a medium such as air, water etc. Mechanical waves unlike electromagnetic waves need a medium to propagate.
Sound waves are longitudinal waves, where the oscillation of particles is along the propagation of waves. The speed of waves through a medium depends on the density of the medium.
The more denser the medium is speed of wave will be less. Moreover in liquids, the molecules are apart and the propagation of sound will be difficult . But through a metal and wood sound waves can travel easily. Hence, option C is correct.
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Why is it expensive to bring electricity into urban areas?
There are various reasons that electricity transmission in urban areas is expensive.
What do you know about electricity supply in urban areas?The electricity to the urban area is supplied by the power plants and the power plants are set up in the rural areas if it is a hydropower plant then it will be set up near the river in the rural areas.
The various reasons for high electricity costs in urban areas are:-
Population density is the population in the urban area is large in the small areas a large number of people live. The transmission line set-up will be costly.Power plants are not located in cities. Power has to travel a long distance over power lines to reach cities.The power consumption in the urban areas is also high so government increases the price so the people can utilise the electricity smartly.Therefore, there were some reasons I have discussed above for the higher electricity cost in urban areas.
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Over the last several decades, scientists have addressed the problem of nonrenewable natural resources such as fossil fuels. Humans are using fossil fuels at a rapid rate and scientists believe that one day we will run out of them. To solve this problem, research has been conducted on alternative energy sources. One alternative energy source is nuclear energy. Although nuclear energy is a good solution to this problem, there are concerns.
Which of these is NOT a benefit of nuclear energy?
A) fossils fuels are not required
B) does not contribute to global warming
C) presence of hazardous radioactive materials
Eliminate
D) little carbon emissions released into the air
Answer:
Option (C)
Explanation:
The nuclear energy is defined as a type of energy which liberates either by the process of nuclear fusion or nuclear fission and is mainly used to generate electricity. This energy is stored in the core of an atom (or nucleus).
It is highly effective, cost-effective and there is no emission of greenhouse gases.
But it also has some disadvantages, of which one is that it produces radioactive waste materials, which are difficult to dispose these substances and is also a very expensive method. These materials emit radiations that are harmful to the organisms. So, it is very challenging to dispose these radioactive waste materials.
Thus, the correct answer is option (C).
Answer:
c.
Explanation:
presence of hazardous radioactive materials
SOMEBODY PLEASE HELP!!! Indicate the reasons why the centripetal acceleration (and centripetal force) always point to the center in uniform circular motion. Select all that apply.
A.) The v points toward the center of the circle.
B.) The t points toward the center of the circle.
C.) F=ma and since "a" points toward the center, so does F.
D.) F=ma and since "m" points toward the center, so does F.
(V=velocity)(T=time)(A=acceleration)(F=force)(M=mass)
Answer:
The correct answer is a=(triangle)v/(triangle)t, and the (triangle) v points toward the center of the circle. AND C. F=ma, and since “a” points toward the center, so does F.
Explanation:
I just took this quiz.
A 2.9 gram bullet is shot into a tree stump. It enters at a velocity of 304 m/sec and comes to rest after having penetrated the stump in a straight line. It takes 0.00043 sec to come to a stop after striking the stump. What was the force on the bullet during impact?
The wolves and moose of Isle Royale are the focus of the longest-running study of a predator-prey system in the wild. Both are recent arrivals to Isle Royale: moose swam to the island in the early 1900’s. Wolves followed decades later, traveling over the ice from Canada in the 1940’s.About 40 years into the study, the wolf population crashed when humans introduced the canine-parvovirus. Additional factors over the years have impacted both populations. At one point during the study, the moose population collapsed during the most severe winter on record followed by an outbreak of moose ticks. What point on the graph represents the outbreak of moose ticks and a drastic decline in the moose population?
A) Point A
B) Point B
C) Point C
D) Point D
Point C is the answer
Answer:
We have been given two cases of Wolves and moose of Isle Royale
We need to tell the outbreak of moose ticks and a drastic decline in the moose population.
We can see from the graph that A and B are representing Wolves
So, Option A and B are discarded.
Now, we should know the meaning of Outbreak in a graph which means that the large number of people are represented by a single point.
Point C is representing large number of people at one point
So, Outbreak of Moose ticks is represented by Point C.
Now, the drastic decline is the point where the curve started to decrease
At point D the curve is decreasing
Hence, the drastic decline is at the point D.
So i am doing a science fair project and its about earthquakes so im going to need different supports for my buildings. I found springs but now i need 3 more. URGENT!!
Your teacher gives you 30 mL of vinegar and one gram of baking soda and tells you to find evidence that the law of conservation of mass is correct. Design an experiment to find this evidence and state your expected results.
To demonstrate the law of conservation of mass with vinegar and baking soda, an experiment can be designed where total mass is measured before and after the reaction in a closed system, showcasing that mass remains unchanged as expected by this fundamental chemical law.
To demonstrate the law of conservation of mass using vinegar (acetic acid) and baking soda (sodium bicarbonate), you could design an experiment where you react these two substances and measure the total mass before and after the reaction. Here are the steps you would follow:
Place a clean, dry flask or beaker on a precise digital scale and tare the scale to zero.
Add 30 mL of vinegar to the flask and note the mass.
In a separate container, weigh out one gram of baking soda.
Quickly but carefully add the baking soda to the vinegar in the flask and immediately seal the flask with a balloon or a rubber stopper with a tube to capture any gases produced.
Allow the reaction to proceed completely. This reaction produces carbon dioxide gas, water, and sodium acetate.
Weigh the sealed flask again once the reaction has stopped.
The expected result is that the total mass of the sealed system (flask, vinegar, baking soda, products, and gas within the balloon or stopper) should remain constant as per the law of conservation of mass.
Expected Results
If the experiment is done correctly, there should be no mass change. This is because, according to the law of conservation of mass, mass is neither created nor destroyed in a chemical reaction. In a closed system, the total mass before and after the reaction should be the same, even though the substances' physical states and chemical forms may change.
an object wants to maintain its state of motion because it has mass
You need to measure the length of your driveway. Which measuring tool would produce accurate results that you would expect to be the same as those found by others? A Your hand's span B A string cut to the length of the tip of your finger to the bottom of your palm C A meter stick with only centimeters D A ruler with millimeters and centimeters
the correct naswer is goig to be letter choice D