Which of two curves exhibits exponential growth

Answer:

increases

Explanation:

The barometer is a device that uses mercury in order to work and be able to measure the air pressure. The mercury reacts to the air pressure, so it either goes up or down. If the mercury goes down, that means that it is pressed more, thus the air pressure has increased, or rather is higher. If the mercury is lifting up, that means that there is less pressure from the air, thus the air pressure has declined, or rather is lower. It is a simple device that manages to do a very important job, and it is one of the most important devices used by the meteorologists for telling the current weather conditions, as well as predicting them for the next few days.

These are two questions and two answers

Question 1.) The atomic emission spectrum of hydrogen includes four visible colors of light: red, blue-green, indigo, and violet. Which color of light corresponds with the largest electron transition?

A.) blue-green

B.) red

c.) indigo

d.) violet

Answer:

Explanation:

The atomic emission spectrum is the set of coloer lines or frequencies of electromagnetic waves emitted by the atoms of an element due to the transition of the electrons from an upper energy level to a lower energy level.

The higher the jump of the electron during the transition,  the higher the energy of th emssion and the higher the frequency of the electromagnetic wave emitted.

The color of light is related with the frequency of the electromagnetic wave.

The order of the frequencies for the visible light are:

Then, violet is the visible light with the highest energy, whicn means that it corresponds to the largest electron transition.

Quesiton 2.) Hydrogen’s emission spectrum includes a line of violet light that has a frequency of 7.31∗10¹⁴ Hz. What is the energy (in joules) a photon of the violet light?

Answer:

Explanation:

The energy of a photon of light is related with its frequency by the Planck - Einstein equation:

Where,

Then, you can just substitute the frequency and the constant to obtain the energy:

(1) The color of light that corresponds with the largest electron transition is violet.

(2) The energy of the violet light with the given frequency is 4.84 x 10⁻¹⁹ J.

The increasing order of the frequencies of the visible light in electromagnetic spectrum include the following:

Thus, the color of light that corresponds with the largest electron transition is violet.

(2)

The energy of the violet light with the given frequency is calculated as follows;

E = hf

where;

E = (6.626 x 10⁻³⁴) x (7.31 x 10¹⁴)

E = 4.84 x 10⁻¹⁹ J.

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Answer:

Co2 and 2H2O are products

Explanation:

In this chemical equation, CH4 and 2O2 react with each other to create a double replacement reaction which creates CO2 and 2H20

Hope this helps!

Answer:

c.10

Explanation:

An oxygen atom is always made up of 8 protons.

The mass number of an atom is made up of both protons and neutrons.

So to find out the number of neutrons, you subtract the number of protons from the mass number.

Number of neutrons = Mass number - number of protons

So for oxygen with a mass number of 18:

There are: 18 - 8  = 10 neutrons

------------------------------------------------

Answer:

There are 10 neutrons in an atom of oxygen with a mass number of 18.

(option C)

Answer:

The substance that dissolves

Explanation:

Solute is the substance that disappears into a liquid. For example,when salt dissolves in water,the salt is the solute because it is the substance that saluted.

Answer:

What is a solute?

The answer is C. The substance that gets dissolved.

What is a solvent?

The answer is C. The substance

that dissolves the solute.

Explanation:

Answer:

B.advertising and subscriptions is the correct answer.

Explanation:

advertising and subscriptions are sources of revenue for media companies.

The main objective of media producer is to earn money, there are various methods by which media companies use to earn money.

The most common are advertising and subscriptions

Advertising is the most popular of all revenue types in common media.

TV programs, papers, and websites give their content at a moderate cost to attract a large public.

Advertisement is done to promote the products by selling outlets, which help to generate revenue.

Subscriptions are common with media groups because they contribute to constant revenue.

Advertising and subscriptions are sources of revenue for media companies. Option B is the correct answer.

Thus, Media firms make money from advertising and subscriptions.

The primary goal of a media producer is to make money, and there are several ways that media firms do this. The most prevalent are subscriptions and advertising.

All other revenue models aside from advertising, advertising is the most common in mainstream media.

To draw in a sizable audience, TV shows, newspapers, and websites offer their content for a reasonable price. Advertising is used by retail establishments to market the goods and assist them make money. Subscription Media  groups frequently employ subscriptions because they help provide steady income.

Thus, Advertising and subscriptions are sources of revenue for media companies. Option B is the correct answer.

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Answer:

Thermal energy from the fire is transferred to the water in the pot in the form of heat

Explanation:

A good explanation as to why water boils in a pot sitting over fire is; Thermal energy from the fire is transferred to the water in the pot in the form of heat

Answer:

Explanation:

The nuclide isotope notation represents the isotope by its chemical symbol preceded by a superscript (to the left of the chemical symbol) showing the mass number and a subscript (also the the left of the chemical symbol) showing the atomic number (number of protons).

Copper-70:

Nuclide notation:

Answer:

false :)

Explanation:

Hello There!

The carbon bond strengths of graphite and diamonds are not identical.

"FALSE STATEMENT"

The Ideal Gas Law states that pressure and temperature are directly related, while pressure and volume are inversely related. Likewise, volume and temperature are directly related, while moles are proportional to temperature, pressure, and volume.

The Ideal Gas Law is represented by the equation PV = nRT, where 'P' is pressure, 'V' is volume, 'n' is the number of moles, 'R' is the gas constant, and 'T' is temperature (in Kelvin).

This equation demonstrates that:

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The Ideal Gas Law, described by the equation PV=nRT, shows how pressure, volume, temperature and number of moles of a gas are related. They are all proportional to each other, with pressure and volume inversely proportional, and temperature and number of moles directly proportional.

The Ideal Gas Law is represented by the equation PV = nRT, where P is pressure, V is volume, n is the number of moles of gas, R is the universal gas constant, and T is the absolute temperature. This equation describes how, under many conditions, the pressure, volume and temperature of a gas relate to each other.

Pressure is directly proportional to temperature and the number of moles, and inversely proportional to volume. Therefore, if the temperature or number of moles increases, the pressure increases, and if the volume increases, the pressure decreases.

Volume is directly proportional to temperature and the number of moles, and inversely proportional to pressure. Hence, an increase in temperature or number of moles will increase the volume, whereas an increase in pressure will decrease the volume.

Temperature is directly proportional to pressure, volume, and the number of moles. Thus, an increase in any of these variables leads to an increase in temperature.

Lastyly, the variable n represents the number of moles of gas present and it is directly proportional to pressure, volume, and temperature. As the number of moles increases, so does the pressure, volume, and temperature.

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Answer:

Splitting water molecules produces hydrogen gas, which is used to power machines through hydrogen fuel cells. ( B-)

Electrolysis is used to split water molecules into hydrogen and oxygen, with hydrogen being used to power machines through hydrogen fuel cells.

Electrolysis is most commonly used to produce an energy source through the splitting of water molecules into hydrogen and oxygen gases.

The correct response is B

Splitting water molecules produces hydrogen gas, which is used to power machines through hydrogen fuel cells.

In this process, an electric current is passed through water, typically with the addition of an electrolyte like H₂SO₄ to increase conductivity. At the cathode, water is reduced to hydrogen gas, which can then be used as a clean energy source in hydrogen fuel cells to generate electricity or power vehicles. The oxygen produced at the anode is vented and can be used for other purposes as it does not contribute to environmental pollution.

Answer:

C

Explanation:

same electron configuration

In the reverse reaction of C + H2O = CO + H2, the products would be carbon (C) and water (H2O).

The student is asking about the reverse reaction of C + H2O = CO + H2. In the reverse reaction, the products of the original reaction become the reactants. Thus, for the reverse reaction, carbon monoxide (CO) and hydrogen (H2) would combine to form the original reactants, carbon (C) and water (H2O). Therefore, the products of the reverse reaction would be carbon and water.

Answer:

This solution is likely to be basic.

Assumption: this solution is under room temperature, where [tex]K_w = 10^{-14}[/tex].

Explanation:

The concentration of hydronium ions [tex]\mathrm{H_3O^{+}}[/tex] in the solution can be found from the [tex]\mathrm{pH}[/tex] value. This relationship does not depends on temperature.

[tex]\mathrm{[H_3O^{+}]} = 10^{-\mathrm{pH}} = 10^{-8.55}[/tex].

The question states that for this solution, [tex]\rm [H_3O^{+}] = 8.55\;M[/tex]. Apply the relationship between [tex]\mathrm{[H_3O^{+}]}[/tex], [tex]\mathrm{[OH^{-}]}[/tex], and [tex]K_w[/tex]. Note that the value of [tex]K_w[/tex] is dependent on the temperature of the solution.

[tex]\displaystyle \rm [OH^{-}] = \frac{\mathnormal{K_w}}{[H_3O^{+}]} = \frac{10^{-14}}{10^{-8.55}} = 10^{-5.45}\; M[/tex].

In other words,

[tex]\rm [H_3O^{+}] < [OH^{-}][/tex].

In other words, this solution is basic.

A ) fish is the biotic factor

Answer:

18 True

19 True

20 False

21 True

Explanation:

The total number of dissociated ions in a chemical reaction is shown by the entire ionic equation. Ions that are visible on both sides of the reaction arrow are canceled out by the net ionic equation. The correct option is A.

A chemical equation known as an ionic equation expresses the electrolytes in aqueous solution as dissociated ions. The ionic species are usually followed by (aq) in the equation to denote that they are in an aqueous solution, and this is typically a salt that has been dissolved in water.

The molecular equation is:

HNO₃ + NaOH → NaNO₃ + H₂O.

And the ionic equation: H⁺ + OH⁻ → H₂O.

Na⁺ and NO₃⁻ ions are in an aqueous solution on both sides of the equation, so they are spectator ions. They are not part of the net ionic equation.

So, the net ionic equation is:

H⁺ + OH⁻ → H₂O.

Thus the correct option is A.

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The correct total ionic equation is: H⁺ + NO₃⁻ + Na⁺ + OH⁻ → Na⁺ + NO₃⁻ + H₂O which corresponds to option C.

When considering the reaction between HNO₃ and NaOH, we start by identifying the complete ionic equation. Since both HNO₃ and NaOH are strong electrolytes, they will dissociate completely in aqueous solution:

The total ionic equation for the reaction then becomes:

Here, Na⁺ and NO₃⁻ are spectator ions as they do not participate in the reaction. Thus, the net ionic equation, which shows only the species that undergo chemical change, is:

Therefore, the correct complete ionic equation for the reaction is:

Complete Question: -

Which equation represents the total ionic equation for the reaction of HNO₃ and NaOH?
A. H⁺ + OH⁻ → H₂O
B. HNO₃ + NaOH → NaNO₃ + H₂O
C. H⁺ + NO₃⁻ + Na⁺ + OH → Na⁺ + NO₃⁻ + H₂O
D. H⁺ + NO₃⁻ + OH⁻ → NO₃⁻ + H₂O

Answer:

increases

Explanation:

During a phase change, mass increases.

Answer:

The first blank is half

The second blank is replicated

Explanation:

Cells produced at the end of telophase I have half as many replicated chromosomes as cells that started the process.

Answer:

c

Explanation:

The revenue source is B. advertising and subscriptions.

One of the most significant parts of media is the way that the media business is only that: an industry. Most media makers and outlets are business in nature, with the primary goal of profiting. There are a few strategies or “income models” that media organizations use to profit.

The four most regular income models are:

Thus, from the options given in the question, option B which states that Advertisement and subscription is considered as best option for the given question.

Answer:

1.445 x 10²³ atoms.

Explanation:

Using cross multiplication:

1 mol of Ag contains → 6.022 x 10²³ atoms.

∴ 0.24 mol of Ag contains → ??? atoms.

∴ The no. of Ag atoms in 0.24 mol = (0.24 mol)(6.022 x 10²³ atoms)/(1 mol) = 1.445 x 10²³ atoms.

Answer:

The ossicles amplify the sound. They send the sound waves to the inner ear and into the fluid-filled hearing organ (cochlea). Once the sound waves reach the inner ear, they are converted into electrical impulses. The auditory nerve sends these impulses to the brain.

Sound waves enter the outer ear and travel through a narrow passageway called the ear canal, which leads to the eardrum. The bones in the middle ear amplify, or increase, the sound vibrations and send them to the inner ear—also called the cochlea—which is shaped like a snail and is filled with fluid.

Answer:

its (A) trust me I had that same qeu

Explanation:

Answer:

The answer is B (sodium is more reactive)

Explanation:

The lesser reactive element to magnesium is present on the left side of the magnesium in the periodic table in the same row. Thus, option B is correct.

The periodic table is given as the arrangement of the elements in columns and rows based on the increasing order of the atomic number and the number of valence electrons.

In a periodic table, on moving from left to right reactivity increases, and from top to bottom reactivity decreases.

Thus, the element with the lesser reactivity than magnesium is present in the left of the magnesium in the same row. Thus, option B is correct.

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Answer:

C12H12NO3

Explanation:

Answer:

The answer is C8H8O3.

You rounded in a place where you shouldn't have (see explanation below)!

Explanation:

These are percents by mass. Pretend you have a 100g sample. That means you have:

63.15g C

5.30g H

31.55g O

Divide each by molar mass to find the moles of each:

C: 63.15 / 12 = 5.26 mol

H: 5.30 / 1 = 5.30 mol

O: 31.55 / 16 = 1.97 mol

Now divide each of these values by the lowest of the three to find the ratio between each element in the compound:

C: 5.26 / 1.97 ≈ 2.67

H: 5.30 / 1.97 ≈ 2.69

O: 1.97 / 1.97 = 1

These aren't whole numbers and you can't just round up. If the numbers you ended with were something around 2.98, I would be fine with rounding to 3. But here 2.67 is too different from 3 to the point where we're actually considering a completely different compound.

So, we need to multiply them all by some factor to get whole numbers that will make sense in a chemical formula. If you express 2.67 and 2.69 as fractions, you get about 8/3, and 1 can be represented as 3/3, so 3 is the LCD of all three numbers. Multiply each of the numbers by 3 to get your final answer:

C: 2.67 x 3 ≈ 8

H: 2.69 x 3 ≈ 8

O: 1 x 3 = 3

Side note: if you take the percent masses of the empirical formula you came up with, you'll see they're quite different from the one the question provided, which is why you can't round in this situation:

Finding mass using your empirical formula:

C: 3 x 12 = 36

H: 3 x 1 = 3

O: 1 x 16 = 16

Total mass = 36 + 3 + 16 = 55

% mass:

C: 36/55 = 65.45% (vs. 63.15%)

H: 3/55 = 5.45% (vs. 5.30%)

O: 16/55 = 29.09% (vs. 31.55%)

The values differ by more than 2% in some cases!

Answer:

the 3rd option for make sense,so that's out

Dalton was the pioneer behind the atomic model,but he certainly didn't believe in the nucleus or electrons,much lest electron shells.

Chadwick's discovery was the discovery of the neutron,not electron energy levels.

Niels Bohr's model was an attempt at explaining the hydrogen atom's spectrogram,followed by Erwin Schrödinger.Thus the first option is the answer

Niels Bohr's model of the atom, which posits electrons in fixed energy levels, was supported by observations of the hydrogen atomic spectrum. This spectrum showed distinct lines corresponding to electron transitions, which corroborated Bohr's theory that electrons occupy specific allowed orbits.

Niels Bohr, a Danish physicist, introduced a groundbreaking model of the atom in 1913. Central to Bohr's model was the concept that electrons move in definite orbital paths around the nucleus with specific allowable energy levels, which he referred to as stationary states. This idea was demonstrated using the hydrogen atomic spectrum as evidence, where the emitted light could be seen as distinct lines, each corresponding to an electron moving between these fixed energy levels.

In Bohr's theory, each energy level is quantized, meaning electrons can only occupy certain regions of space at certain energy levels. The electron can jump from one energy level to another, but it does not emit or absorb energy while staying in a given energy level. The hydrogen atomic spectrum provides a visual representation of these jumps as unique spectral lines created when electrons move back to lower energy levels, releasing energy in the form of light.

Bohr's conclusions were primarily derived from observations of the hydrogen atomic spectrum. Hence, option A, Hydrogen atomic spectrum, is the strong support for Bohr's belief that electrons occupied different energy levels. His model successfully predicted the energy levels for hydrogen, earning him the Nobel Prize in Physics in 1922. However, this model could not fully explain the spectra of atoms with more than one electron.

Areas with high air pressure and low humidity typically have fair and dry weather due to sinking air that discourages cloud formation and a lack of moisture that reduces precipitation likelihood.

If an area has high air pressure and low humidity, it is likely to experience fair and dry weather. High air pressure usually involves sinking air, which inhibits cloud formation and leads to clearer skies. Low humidity means there is less moisture in the air, further reducing the likelihood of precipitation. Without the rising, condensing air masses characteristic of low-pressure systems, which produce clouds and precipitation, an area with high pressure and low humidity tends to have stable and pleasant weather.

Answer:

Explanation:

If you are using a wire made out of (say) iron the formula would be

R = k * L / (pi * r^2)

pi r^2 represents the cross sectional area.

L is the length of the wire.

k is the resistance constant for that material.

So, resistance is measured as

k which depends on the material. It is different for all materials. Copper Silver and Gold for example, all have different k values.

L is the length of the material

pi * r^2 is the area of a thin slice of this material.

Answer:

C.Chemicals can help or hurt our world.

Explanation:

Chemistry: it is a branch of science which study  the composition, properties and activity of organic substances and inorganic substances and various elementary forms of matter.

It study chemical reactions,properties and phenomenon etc.

In chemistry, we use chemicals for chemical reactions.

Drugs are made with salt like aspirin .Salt are chemicals.

Chemical use in drugs and drugs are used for treatment of diseases.

Then, chemicals are useful in these case.

But, the chemicals used in fertilizers, use for  production increase of fruits and vegetables.Then it is harmful for humans and soils.

In this way it harmful  for our world.

Hence, chemicals can help or hurt our world is correct answer.

Answer:C.Chemicals can help or hurt our world.

The correct option is C, Chemicals can help or hurt our world.

Chemistry plays a significant role in shaping our world and has both positive and negative impacts. Here are a few ways in which chemistry affects our world:

Medicines and Healthcare: Chemistry is crucial for the development and production of medicines, allowing us to treat diseases, alleviate symptoms, and improve overall health. It enables the discovery of new drugs, the understanding of biochemical processes, and the synthesis of pharmaceutical compounds.

Agriculture: Chemistry is involved in various aspects of agriculture, such as the development of fertilizers, pesticides, and herbicides. These chemicals help increase crop yields and protect plants from pests and diseases. Additionally, chemistry is essential in studying soil composition, plant nutrition, and developing new agricultural technologies.

Energy Production: Chemistry plays a vital role in energy production, including fossil fuels, nuclear power, and renewable energy sources. It is involved in the extraction, processing, and transformation of energy resources. Chemistry also contributes to the development of more efficient and sustainable energy technologies, such as batteries and solar cells.

Materials and Manufacturing: Chemistry enables the synthesis and manipulation of materials, leading to the development of new products and technologies. It is involved in the production of plastics, metals, ceramics, and composite materials, which are used in various industries like construction, electronics, automotive, and aerospace.

Environmental Impact: While chemicals have improved various aspects of our lives, they can also have negative effects on the environment. Certain chemicals, when released into the environment without proper management, can cause pollution and harm ecosystems. For example, industrial pollutants, emissions from vehicles, and improper waste disposal can lead to air, water, and soil pollution.

It is important to note that the impact of chemicals on the world depends on how they are used, managed, and regulated. Responsible and sustainable chemical practices can minimize negative effects and maximize the benefits of chemistry in our society.

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Answer:

NO₃⁻.

Explanation:

For the reaction: Mg(s) + Zn²⁺ + 2NO₃⁻ → Mg²⁺ + 2NO₃⁻ + Zn(s),

Because the nitrate anions are present on both sides of the equation, they are spectator ions.

In the reaction, the spectator ions are the nitrate ions (NO3-), as they do not participate in the reaction and remain unchanged.

In the provided reaction Mg(s) + Zn2+ + 2NO3- → Mg2+ + 2NO3- + Zn(s), the spectator ions are the nitrate ions (NO3-). These ions are present on both sides of the equation and do not participate in the exchange of electrons, which occur between the Mg(s) and Zn2+ ions. Consequently, they can be omitted when writing the net ionic equation, which focuses solely on the species that undergo chemical change.

Answer:

According to its role in an ecosystem

Explanation:

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