Three examples why cell division is important

There are five significant figures in the measurement 0.023040 cm.

To determine the number of significant figures in a given measurement, one must follow these rules:

1. Non-zero digits are always significant. In the measurement 0.023040 cm, the digits 2, 3, and 4 are non-zero and thus significant.

2. Zeros between non-zero digits are significant. Here, the zero between the 3 and the 4 is significant because it is sandwiched between two non-zero digits.

3. Leading zeros, which are zeros before the first non-zero digit in a number less than one, are not significant. In this case, the two zeros after the decimal point and before the 2 are leading zeros and are not significant.

4. Trailing zeros, which are zeros at the end of a number, are significant if the number has a decimal point. In the measurement 0.023040 cm, the zero at the end is after the decimal point and is therefore significant.

Applying these rules, we count the significant figures in 0.023040 cm as follows:

- The first two zeros after the decimal point are not significant (leading zeros).

- The digit 2 is significant.

- The digit 3 is significant.

- The zero between the 3 and the 4 is significant (it is between two non-zero digits).

- The digit 4 is significant.

- The last zero is significant (trailing zero after the decimal point).

Therefore, the measurement 0.023040 cm has five significant figures.

Answer:

0.326338 kcal

Explanation:

Data given:

Value in Joules = 1365.4 joules

Value in Kilocalories (kcal) =  to find

Solution:

Joule and Kilocalori both are the unit of energy

Relation of kilocalori

                   1 joule = 0.000239 kcal

so now to find

1365.4 joules equals to how much kilocalories

if

                                 1 joule = 0.000239 kcal

then                1365.4 joules = ? Kilocalories

by cross multiplication

          1 joule x ? Kilocalories = 0.000239 kcal x 1365.4 joules

By rearranging

           Kilocalories = 0.000239 kcal x 1365.4 joules / 1 joule

         Kilocalories = 0.000239 kcal x 1365.4 joules / 1 joule

         Kilocalories = 0.32633 kcal

So

         1365.4 joules = 0.32633 kcal  

[tex]1365.4 \ joules[/tex] is approximately [tex]0.3264\ kilocalories.[/tex]

To convert energy from joules to kilocalories, we use the conversion factor:

[tex]\[ 1 \, \text{kilocalorie} = 4184 \, \text{joules} \][/tex]

Given:

[tex]\[ 1365.4 \, \text{joules} \][/tex]

We convert joules to kilocalories as follows:

[tex]\[ \text{kilocalories} = \frac{\text{joules}}{\text{joules per kilocalorie}} = \frac{1365.4 \, \text{joules}}{4184 \, \text{joules per kilocalorie}} \][/tex]

Perform the calculation:

[tex]\[ \text{kilocalories} = \frac{1365.4}{4184} \][/tex]

[tex]\[ \text{kilocalories} = 0.3264 \][/tex]

Answer:

non-metal

Explanation:

Covalent bonds are formed when non-metal atoms are combined.

In the periodic table, that's groups 3A, 4A, 5A, 6A and 7A, all to the right of the "staircase" line.

Answer:

The charge in the clouds can cause the ground to become positively charged.

Explanation:

During a thunderstorm, the important charging area is the central part or portion of the storm when air is moving in an upward direction. The temperature here ranges from -15 to -25 degree Celsius.  The ground has a slightly negative charge and when a thunderstorm comes the negative charge on the ground is repelled by the negative charge in the center of the storm. This makes the ground that is underneath the storm to become more positively charged.  

Final answer:

Dmitri Mendeleev is credited with creating the first recognized periodic table of elements in 1869, which included predictions for undiscovered elements, making it a groundbreaking contribution to chemistry.

Explanation:

The answer to the student's question is a. True. Dmitri Mendeleev is widely credited with creating the first periodic table of the elements in 1869. This early version of the periodic table organized elements by increasing atomic mass and showcased periodic trends. Mendeleev also boldly left gaps in his table for undiscovered elements, predictively detailing their possible properties, many of which were later confirmed with the discovery of elements like gallium and germanium. While German chemist Lothar Meyer also published a similar table around the same time, Mendeleev's periodic table is generally recognized as more significant due to its predictive nature and earlier publication.

Answer:

[tex](_{1} ^ {1}\textrm{H})[/tex]  is the correct choice that is option A.

Explanation:

An electron has [tex]\frac{1}{1836}[/tex] times the mass of a proton, but an equal and opposite negative charge.

Lets [tex]_{A}^{Z}\textrm{X}[/tex] is any element represented here.

Where [tex]Z[/tex] is the number of protons as well as its atomic number.

And

[tex]A[/tex] is the mass number which is the number of protons and neutrons in any atom.

Note: We know that Hydrogen [tex](_{1} ^ {1}\textrm{H})[/tex] is devoid of neutron,so number of neutrons in a Hydrogen atom is zero.

Then

[tex](_{1} ^ {1}\textrm{H})[/tex] is also a representation of single proton.

So [tex](_{1} ^ {1}\textrm{H})[/tex] is the right choice that is option A.

The mass of an electron is approximately 1/1836 times the mass of a proton.

The mass of an electron is approximately 1/1836 times the mass of a proton (choice B). This means that the mass of the electron is much smaller compared to the mass of the proton. For example, in a hydrogen atom, which consists of just one proton and one electron, the mass of the proton is about 1836 times greater than the mass of the electron.

Answer: True

Explanation:

Photons do not have mass, so they are not considered matter. However, they do have a stationary state either, so they are not considered an object in Physics.

Atoms form ions by gaining or losing electrons. A cation forms when an atom loses electrons, while an anion forms when an atom gains electrons. An ionic bond is formed between oppositely charged ions, while a covalent bond is formed by the sharing of electrons between atoms.

Ions are formed when atoms gain or lose electrons. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. An example of a cation is sodium (Na+), which loses one electron to form a positive ion. An example of an anion is chloride (Cl-), which gains one electron to form a negative ion.

Difference between ionic and covalent bonds:

An ionic bond is formed by the attraction between a positive ion (cation) and a negative ion (anion). These ions are held together due to the opposite charges, similar to how oppositely charged magnets stick together. A covalent bond is formed when electrons are shared between two atoms. Each atom shares one of their electrons, which then orbits the nuclei of both atoms. Covalent bonds are typically formed between nonmetal atoms.

Answer:

Electronic Configuration of calcium ion: Ca²⁺

1s², 2s², 2p⁶, 3s², 3p⁶

Explanation:

Calcium belong to group IIA and known as alkaline earth metals.

Electronic Configuration of calcium atom: ²⁰Ca

1s², 2s², 2p⁶, 3s², 3p⁶, 4s²

When calcium ion is form it loses two electron and have 2+ charge on it.

and have total of 18 electrons

So,

Electronic Configuration of calcium ion: Ca²⁺

the last filled orbital will be 3p⁶

1s², 2s², 2p⁶, 3s², 3p⁶

117 mL of 0.210 M K₂S solution

Explanation:

The question asks about the volume of 0.210 M K₂S (potassium sulfide) solution required to completely react with 175 mL of 0.140 M Co(NO₃)₂ (cobalt(II) nitrate).

We have the chemical reaction:

K₂S + Co(NO₃)₂ → CoS + 2 KNO₃

molar concentration = number of moles / volume (L)

number of moles = molar concentration × volume

number of moles of Co(NO₃)₂ = 0.140 × 175 = 24.5 mmoles

We see from the chemical reaction that 1 mmole of Co(NO₃)₂ is reacting with 1 mmole of K₂S, so 24.5 mmoles of Co(NO₃)₂ are reacting with 24.5 mmoles of K₂S.

volume = number of moles / molar concentration

volume of K₂S solution = 24.5 / 0.210 = 117 mL

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Potassium Chloride and sodium chloride is a combination ofmineral supplement that may be helpful in heart prostration

Answer:

d) Chlorine

Explanation:

when an atom form ion its atomic radius changed from neutral atomic radius.

if the atom form cation its atomic radius is smaller than neutral atomic radius.

If atom form anion its anionic radius is larger than the neutral atomic radius.

The reason is that when electron is remove energy shell deduced so cation get smaller ionic radii while in case of anion electron is added and size increase.

In given list of elements potassium, zinc and chromium form cation while chlorine form anion.

That's why its ionic radius will larger than atomic radius.

The element with an ion that has a larger radius than its atomic radius is potassium (K).

Based on the information provided, the ion with a radius larger than its atomic radius is K (potassium). This is because potassium loses an electron to form a cation (K+), which has a larger radius than its neutral atomic form. The loss of one electron reduces the attractive force between the electrons and the nucleus, causing the electron cloud to expand, resulting in a larger radius.

Answer:

a

Explanation:

Volume

Answer:

The line drawn through points D and E.

Explanation:

Y is a horizontal line and D and E are both on the same line. If a line were drawn it would be within the Y plane.

Answer:

B. The line that can be drawn through points D and E is contained in plane Y.

Explanation:

Answer:

Balanced

Explanation:

2 Carbons per side

4 Hydrogens per side

3 Oxygen per side

1 Iron per side

Answer:

Balanced

Explanation:

For an equation to be balanced, the number of atoms of each element on the lefthand side and right hand side of the reaction equation must be exactly the same.

There are four hydrogen atoms on each side

There is one carbon atom on each side

There are three oxygen atoms on each side

There is one iron atom on each side.

This is how to know a balanced chemical reaction equation.

Answer:

Q and R are most likely to form an ionic bond.

Explanation:

Ionic bond is formed between two elements which have huge difference in their electronegativities.

     According to the given question the electronegativity difference of QR is greater than that of PQ, RS and SP.

   From this point of view it can be stated that Q and R are most likely to form an ionic bond.

Answer:

Q and R

Explanation:

Answer:

Titan which orbits Saturn

Explanation:

Saturn's Titan is the only moon known to have a significant atmosphere, composed mainly of nitrogen with organic particles and methane lakes on its surface.

The only satellite known to have an atmosphere in the planet it orbits is Titan, the largest moon of Saturn. Titan has a substantial atmosphere composed mainly of nitrogen. It is the only moon in the outer solar system with a significant atmosphere, and its atmosphere is even denser than Earth's. The atmosphere of Titan is of great interest to scientists because it contains organic particles and may provide clues to the early stages of life formation on Earth.

The only known satellite in the solar system with a substantial atmosphere is Saturn's Titan. Titan is unique among moons in that it possesses a dense atmosphere filled with organic particles. This atmosphere is primarily composed of nitrogen, similar to Earth's, but with temperatures too low to allow for carbon dioxide or water vapor, resulting in nitrogen being the dominant gas. The atmosphere on Titan is of great interest to scientists because it may provide clues to the early stages of how life formed on Earth. The Cassini spacecraft and the Huygens probe provided valuable data on Titan's composition, including the discovery of methane lakes on its surface.

Explanation:

[tex]\text{number of moles}=\frac{\text{given mass}}{\text{molar mass}}[/tex]

For [tex]NH_{3},[/tex]

[tex]\text{given mass}=3g[/tex]

[tex]\text{molar mass}=14+3=17g[/tex]

[tex]n_{NH_{3}}=\frac{3}{17}=0.176[/tex]

For [tex]HCl,[/tex]

[tex]\text{given mass}=5g[/tex]

[tex]\text{molar mass}=1+35.5=36.5g[/tex]

[tex]n_{HCl}=\frac{5}{36.5}=0.136[/tex]

The reaction between [tex]NH_{3}[/tex] and [tex]HCl[/tex] is

[tex]NH_{3}+HCl[/tex]→[tex]NH_{4}Cl[/tex]

So,one mole of [tex]NH_{3}[/tex] requires one mole of [tex]HCl[/tex]

[tex]0.176[/tex] moles of [tex]NH_{3}[/tex] requires [tex]0.176[/tex] moles of [tex]HCl[/tex]

But there are only [tex]0.136[/tex] moles of [tex]HCl[/tex] available.

[tex]HCl[/tex] will be consumed first.

So,[tex]HCl[/tex] is the limiting reagent.

Answer:

C. The food we eat is fresher because it is treated with preservatives

Answer:

Option-(B,C): Due, to having more advanced or modern farming techniques there is more land available for the construction of industrial buildings  and neighborhoods. While, the food we eat is fresher because it is treated with preservatives.

Explanation:

The modern farming techniques has provided with great benefits, as there is more space for building new structures and develop the industrial zones more frequently. As, there is now much space to have industries in the region,while the farms are much advanced these days. Along with that, the food is able to eaten after longer duration of time and is able to be supplied to much far distances across the borders to other countries or regions. Just because the food we eat is fresher because it is treated with preservatives.As, there are some modern techniques which has able us to preserve the food through any long season.

Answer:

C = Electrons are won and lost.

Explanation:

The oxidation reduction reactions are called redox reaction. These reactions are take place by gaining and losing the electrons and oxidation state of elements are changed.

Oxidation:

Oxidation involve the removal of electrons and oxidation state of atom of an element is increased.

Reduction:

Reduction involve the gain of electron and oxidation number is decreased.

Consider the following reactions.

4KI + 2CuCl₂  →   2CuI  + I₂  + 4KCl

the oxidation state of copper is changed from +2 to +1 so copper get reduced.

CO + H₂O   →  CO₂ + H₂

the oxidation state of carbon is +2 on reactant  side and on product side it becomes  +4 so carbon get oxidized.

Na₂CO₃ + H₃PO₄  →  Na₂HPO₄ + CO₂ + H₂O

The oxidation state of carbon on reactant side is +4. while on product side is  also +4 so it neither oxidized nor reduced.

H₂S + 2NaOH → Na₂S + 2H₂O

The oxidation sate of sulfur is -2 on reactant side and in product side it is also -2 so it neither oxidized nor reduced.

Oxidizing agents:

Oxidizing agents oxidize the other elements and itself gets reduced.

Reducing agents:

Reducing agents reduced the other element are it self gets oxidized.

To convert 4.82 mmol of diphenylmethanol to grams, calculate the molar mass of C13H12O to be 184.32 g/mol. Then, multiply 4.82 mmol by the molar mass and divide by 1000 mmol/mol to get 0.8886 grams.

To convert 4.82 mmol of diphenylmethanol (C13H12O) to grams, you first need to calculate the molar mass of diphenylmethanol. The molar mass is calculated by the sum of the atomic weights of each atom in the molecular formula. The molecular weights are approximately: Carbon (C) = 12.01 g/mol, Hydrogen (H) = 1.008 g/mol, and Oxygen (O) = 16.00 g/mol. Thus, the molar mass of C13H12O is (13x12.01 g/mol) + (12x1.008 g/mol) + (16.00 g/mol) = 184.32 g/mol.

Next, use the conversion factor that relates millimoles to grams using the molar mass:

4.82 mmol C13H12O x (184.32 g/mol) / (1000 mmol/mol) = 0.8886 g C13H12O

So, 4.82 mmol of diphenylmethanol is equivalent to 0.8886 grams.

Answer:

individual ancient shark vertebra

Explanation:

it ask for a body fossil and that is the only body fossil

One of the example that falls under classification of body fossil is C:

individual ancient shark vertebra

The main types of fossil are:

Most of the  body fossils usually have a hard parts these part could be

Therefore, option C is right

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Answer:

If anything but H2O were found, it would be evidence of a chemical change. Therefore, 4 is the only viable evidence that it was a physical change of H2O liquid to H2O gas.

Answer:

4-[tex]H_{2}O_{(g)}[/tex]

Explanation:

Initially, the beaker contains distilled water which is liquid water at room temperature. When the beaker was placed on a hot plate and heat energy was applied the temperature of the system increases gradually until the boiling point was reached. Water generally boils at 100°C and at this temperature, liquid water changes to vapor or gas. In addition, liquid water and steam or water vapor are in equilibrium. Therefore, the presence of water vapor ([tex]H_{2}O_{(g)}[/tex]) indicates that the process is a physical change.

Its molecule contains one oxygen and two hydrogen atoms.

Explanation:

Water is a chemical substance with the chemical formula H2O. Water is a chemical substance with the chemical formula H2O. Its molecule contains one oxygen and two hydrogen atoms connected by covalent bonds.

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Answer:

[tex]Zn^{0} --->Zn^{2+} +2e^{-}[/tex]

Explanation:

[tex]Zn^{0} --->Zn^{2+} +2e^{-}[/tex]

Answer:

The temperature range in the Mesosphere 15 degrees Celsius (5 degrees Fahrenheit) to negative 120 degrees Celsius (negative 184 degrees Fahrenheit)

Explanation:

The mesosphere lies above the stratosphere and extends over the Earth's surface to 85 kilometers (53 miles). The temperature at the mesosphere limit drops from negative 15 degrees Celsius (5 degrees Fahrenheit) to negative 120 degrees Celsius (negative 184 degrees Fahrenheit) at the base of the thermosphere.

Meteors vaporize in mesosphere, giving metallic ions a higher concentration than other layers of atmosphere.

Final answer:

The temperature in the mesosphere ranges from about 0°C at its lower boundary to as low as -100°C at the mesopause, its upper boundary. The mesosphere's low temperatures are due to its very thin air and lack of water vapor and ozone to absorb heat from the sun.

Explanation:

The temperature range in the mesosphere varies significantly with altitude. At the lower boundary, directly above the stratosphere (starting around 50 km above Earth's surface), temperatures can be around 0°C. As altitude increases within the mesosphere, temperatures drop sharply, reaching the mesosphere's lowest temperatures at the mesopause, which lies at the top of the mesosphere, around 85 km above the surface. Here, temperatures can plunge to as low as -100°C (-148°F).

The mesosphere is warmed from the bottom by the stratosphere below. The air in the mesosphere is very thin, and its density is approximately 1/1000th of that at the surface, which makes this atmospheric layer quite cold. This temperature decrease with altitude is due to the minimal amounts of water vapor and ozone that would otherwise help to absorb the sun's rays and heat the air.

Answer:

The Venus flytrap consumes its food in the form of flies and other small insects not through the roots as other plants

Explanation:

Answer:

The thing about the venus fly trap which makes it so unique and are known for is its ability to digest insects.

Explanation:

The thing about the venus fly trap which makes it so unique and are known for is its ability to digest insects. In its name "fly trap" which are commonly house plants implies the ability of trapping insects for its nutrional value

Answer:

the answer is current curricular

Answer:

current curricular

Explanation:

5. It is one of the most important greenhouse gases linked to global warming, but it is a minor component of Earth’s atmosphere (about 3 volumes in 10,000), formed in combustion of carbon-containing materials, in fermentation, and in respiration of animals and employed by plants in the photosynthesis of carbohydrates.

The mass of oxygen and carbon required to produce 56 grams CO has been 32 grams and 24 grams respectively. The law that illustrates this has been the law of conservation.

The moles of product or reactant in a chemical reaction are given by the stoichiometric coefficient of the balanced chemical equation.

The given balanced equation has been:
[tex]\rm 2\;C\;+\;O_2\;\rightarrow\;2\;CO[/tex]

From the balanced chemical equation, for the formation of 2 moles of CO,1 mole of oxygen and 2 moles of carbon has been required.

56 g of CO has been equivalent as:

[tex]\rm Moles=\dfrac{Mass}{Molar\;mass} \\\\Moles\;CO=\dfrac{56}{28}\;mol\\\\ Moles\;CO=2\;moles[/tex]

The moles of CO produced has been 2 moles. Thus, the moles of oxygen and carbon required are:

The mass of oxygen required is 32 grams.

The mass of carbon required has been 24 grams.

The law that illustrates this is the law of conservation. According to the law of conservation, mass has not been lost in the chemical reaction.

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Answer:

[tex]\frac{PV}{T}=k[/tex]

Explanation:

Combine Gas law is a combination of  three gas laws which are  Boyle's Law, Charles' Law, and Gay-Lussac's Law.

Combine gas law states that the ratio of the product of pressure and volume and the absolute temperature of a gas is equal to a constant.

Hence the equation becomes:

[tex]\frac{PV}{T}=k[/tex]

where P = pressure,

V = volume,

T = absolute temperature,

k = constant.

Now we know that Kelvin = °Celsius + 273

For all gas law problems it is necessary to work in the Kelvin scale because temperature is in the denominator in the combined gas laws (P/T, V/T and PV/T) and can be derived in the ideal gas law to the denominator (PV/RT) . If we measured temperature in Celsius we could have a value of zero degrees Celsius and this would solve as no solution, as you cannot have zero in the denominator.

However, if we reached zero in the Kelvin scale this would be absolute zero and all matter would stop and therefore there would be no gas laws to worry about.