Which of the following produces identical nuclei in cells? A pollination B miltosis C osmosis D fertilization

Answer:

Explanation:

Deforestation has an adverse affect on air by reducing the amount of oxygen and increasing the amount of carbon dioxide as well as contributing to global warming.

Answer:

choice 3

Explanation:

Hydrogen bonding occurs when a H is bonded to a highly electronegative atom like F. Towards the upper right corner, most atoms have high electronegativity and small atomic radii, according to periodic trends.

Please give thanks :)

Hydrogen is covalently bonded to an element that has a small atomic radius and high electronegativity.  

• An intermolecular attractive force in which an atom of hydrogen, which is bonded covalently to a small, highly electronegative atom is known as a hydrogen bond.  

• Hydrogen bonds are very strong in comparison to other dipole interactions.  

• A typical hydrogen bond exhibits a strength of about 5 percent of that of a covalent bond.  

• Hydrogen bonding takes place only in molecules where hydrogen bonding is bonded covalently to one of the three elements, that is, oxygen, fluorine, or nitrogen.  

Thus, correct answer is option 3.

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Answer:

V = 1.57 L

Explanation:

Given data:

Mass of iron(III) carbonate = 50.0 g

Volume of CO₂ formed = ?

Temperature = standard = 273 K

Pressure = standard = 1 atm

Solution:

Chemical equation:

Fe₂(CO₃)₃     → Fe₂O₃ + 3CO₂

Number of moles of Fe₂(CO₃)₃ :

Number of moles = mass/molar mass

Number of moles = 50.0 g /235.8 g/mol

Number of moles = 0.21 mol

Now we will compare the moles of Fe₂(CO₃)₃  and CO₂.

                          Fe₂(CO₃)₃         :             CO₂

                              1                    :               3

                            0.21                :            1/3×0.21 = 0.07 mol

Volume of CO₂:

PV = nRT

R = general gas constant = 0.0821 atm.L/mol.K

By putting values,

1 atm × V =0.07 mol × 0.0821 atm.L/mol.K × 273 K

V = 1.57 atm.L / 1 atm

V = 1.57 L

Answer:

True

Explanation:

Solid molecules don't move.

Molecule of a solid are tightly packed there is no space between them so there is no movement of the molecule.

The particles (atoms or molecules) are attracted to each other. The particles (atoms or molecules) vibrate but do not move past one another. The solid retains its shape.

true

Answer:

1.014×10²³ atoms

Explanation:

Given data:

Volume of tungsten = 1.6 cm³

Density of tungsten = 19.35 g/cm³

Number of atoms of tungsten = ?

Solution:

First of all we will calculate the mass of tungsten.

density = mass/volume

by putting values,

19.35 g/cm³ = mass/1.6 cm³

Mass = 19.35 g/cm³× 1.6 cm³

Mass = 30.96 g

Number of moles of tungsten:

Number of moles = mass/molar mass

Number of moles = 30.96 g/ 183.84 g/mol

Number of moles = 0.1684 mol

1  mole contain 6.022×10²³ atoms.

0.1684 mol × 6.022×10²³ atoms / 1mol

1.014×10²³ atoms

Answer:

In a chemical reaction, substances (elements and/or compounds) called reactants are changed into other substances (compounds and/or elements) called products. You can’t change one element into another in a chemical reaction — that happens in nuclear reactions. Instead, you create a new substance with chemical reactions.

In general terms, a chemical reaction follows this format:

Reactants→Products

For example, take a look at the reaction that occurs when you light your natural gas range. Methane (natural gas) reacts with the oxygen in the atmosphere to produce carbon dioxide and water vapor. The chemical equation that represents this reaction is written like this:

Methane and oxygen (oxygen is a diatomic — two-atom — element) are the reactants, while carbon dioxide and water are the products.

Explanation:

In the given incomplete chemical reaction, the product formed are [tex]\rm CO_2[/tex] and [tex]\rm H_2O[/tex], respectively.

Product is the final result in a chemical reaction where reactants react to produce new substance.

The complete balanced reaction for the given reaction is expressed as:

[tex]\rm CH_4+2O_2\rightarrow CO_2 + 2H_2O[/tex]

In this reaction, methane undergoes combustion reaction in presence of oxygen to produce [tex]\rm CO_2[/tex] and [tex]\rm H_2O[/tex] as the final product.

Properties of the final products are:

[tex]\rm CO_2[/tex] (carbon dioxide) is a colorless, odorless gas that is denser than air. It is non-flammable, non-toxic, and does not support combustion. It is a greenhouse gas, which means that it contributes to global warming and climate change.

Water is a colorless, odorless, and tasteless liquid that is essential for life. It helps in various metabolic process taking place within human body.

Therefore, the complete and balanced equation for provide equation with final product is [tex]\rm CH_4+2O_2\rightarrow CO_2 + 2H_2O[/tex].

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The given question is incomplete. The complete question is:

What is the product in this reaction: [tex]\rm CH_4+2O_2\rightarrow[/tex]? What are its properties?

Answer:

A catalyst is a substance that can be added to a reaction to increase the reaction rate without getting consumed in the process. Catalysts typically speed up a reaction by reducing the activation energy or changing the reaction mechanism.

Explanation:

Answer:

Here you go!!

Explanation:

Answer:

True

Explanation:

Methylcyclohexane has a cyclic compound of 7 carbons false classified as Saturated Hydrocarbon.

Answer:

The particles in a liquid as it freezes slow down.

Explanation:

This is because heat is energy and when there is less heat, there is less energy causing the particles to slow down.

Answer:

Most likely A. Molten lava, since it straight up melts the equipment which is much faster than chemicals dissolving the equipment like hydrochloric acid and nitric acid.

Explanation:

Hope this helped!

P.S. Sure, why not?

Answer:

[tex]\Delta _{fus}H=332 \frac{J}{g}[/tex]

Explanation:

Hello!

In this case, since the heat of fusion of a solid substance stands for the energy required to melt it, which is a phase transition from solid to liquid, we can see that the heat lost by water is that gained by the solid, so we can write:

[tex]Q_{solid}=-Q_{w}[/tex]

Thus, by using the water data and its specific heat (4.184), we obtain:

[tex]Q_{solid}=-m_{w}C_{w}(T_f-T_i)\\\\Q_{solid}=-425g*4.184\frac{J}{g\°C}*(30.0-85.1)\°C\\\\ Q_{solid}=97,978.82J=98.0kJ[/tex]

Next, since the heat of fusion of a substance is usually represented in terms of energy per amount of substance, we use the mass of solid to obtain:

[tex]\Delta _{fus}H=\frac{98.0kJ}{295.5g}\\\\ \Delta _{fus}H=0.332\frac{kJ}{g}=332 \frac{J}{g}[/tex]

Best regards!

The heat of fusion of the solid is 0.332 KJ/g or 332 J/g

We'll begin by calculating the heat loss by the water. This can be obtained as follow:

Mass of water (M) = 425 g

Initial temperature of water (T₁) = 85.1 °C

Final temperature (T₂) = 30 °C

Change in temperature (ΔT) = T₂ – T₁ = 30 – 85.1 = –55.1 °C

Specific heat capacity of water (C) = 4.184 J/gºC

Q = MCΔT

Q = 425 × 4.184 × –55.1

Q = –97978.82 J

Divide by 1000 to express in KJ

Q = –97978.82 / 1000

Heat loss by water = –97.98 KJ

Heat gained by the solid (Q) = 97.98 KJ

Mass of solid (m) = 295.5 g

Q = m•Hf

97.98 = 295.5 × Hf

Divide both side by 295.5

Hf = 97.98 / 295.5

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Answer:

From the plastic cup to the water

Explanation:

The thermal energy is transferred from the plastic cup to the water inside the cup.

This is because thermal energy moves from a body at high temperature to one at lower temperature.

Answer:

Reactant Side = Al + Cl₂  

Product Side = AlCl₃

Oxidizing Agents  = chlorine

Reducing Agent = aluminum

Explanation:

Chemical equation:

2Al + 3Cl₂     →      2AlCl₃

In this chemical equation Al and Cl₂ are reactants while AlCl₃ is product.

2Al° + 3Cl₂°     →      2Al⁺³Cl⁻¹₃

Oxidation:

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

In given reaction Al is oxidized because oxidation increase from zero to +3. It is thus reducing agent.

Reduction:

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

In given reaction chlorine is reduced because its oxidation state is decreased from zero to -1. Chlorine is oxidizing agent.

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.

Answer:

If I'm correct i believe that the answer is A.

Answer:

A. Where warm moist air masses traveling north collide with cool dry air masses traveling south

Explanation:

I got it right

Explanation:

It's a triple bond for nitrogen,double bond for oxygen(just saying)

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

mass = Density × volume

From the question we have

mass = 2.01 × 3.77 = 7.5777

We have the final answer as

Hope this helps you

Answer:

12 molcules

Explanation:

distruibtive property.

Answer:

7

Explanation:

Answer:

λ = 0.45×10⁻⁶ m

Explanation:

Given data:

Wavelength of blue light = ?

Frequency of blue light = 6.69×10¹⁴ s⁻¹

Solution:

Formula;

Speed of wave = wavelength × frequency

Speed of wave = 3.00×10⁸ m/s

by putting vales,

3.00×10⁸ m/s = λ × 6.69×10¹⁴ s⁻¹

λ = 3.00×10⁸ m/s / 6.69×10¹⁴ s⁻¹

λ = 0.45×10⁻⁶ m

Answer:

10.35%

Explanation:

Find the molar mass of water, using your periodic table: 18.02 g. Then find the molar mass of the total substance: 174.10 g.

Divide the molar mass of water by the molar mass of the total substance and multiply 100%. Doing this, you get 10.35%.

Answer:

6.02 x 10²³ atoms

Explanation:

Given parameters:

Number of moles CaSO₄ = 1 mole

Unknown:

Number of Ca atoms in the given compound = ?

Solution:

The given compound is:

          CaSO₄

     1 mole of CaSO₄  is made up of 1 mole of Ca atoms

Now;

   1 mole of any substance contains 6.02 x 10²³ atoms

  1 mole of Ca atoms will also contain 6.02 x 10²³ atoms

Answer:

Following are the solution to the given question:

Explanation:

Due to the strong attachment among ions, it's indeed hard to break the covalent compounds in a combination. The ionic compounds, as they have a great melting point, become solid at room temperature, and may we say that the stronger between both the ions, as it is on a high point of fusion, is quite desirable.

Answer:

Analog signals are used to convert sound waves into electronic signals.

Explanation:

i think i hope i helped :))

how is your day going?

Answer

B

Explanation:

I did this quiz and i think i got it right Good luck!

Answer:

D

Explanation:

Option D is correct

Cycloalkanes(1-bromo 2-ehtyl cyclohexane is this case) mainly preferred chair conformers while undergoing elimination reaction and further products are not those that predicted by zaitsev's rule.

Hence, the correct answer is faster for the trans isomer since there is a hydrogen anti-periplanar to the bromine in the preferred chair conformer of the compound.

The enthalpy change accompanying the reaction of 0.95 g of S is -11.85 kJ

Given

ΔH° for the reaction is -790 kJ

Required

The enthalpy change

Solution

Reaction

2S (s) + 3O₂(g) = 2SO₃ (g)

mol of S(MW=32 g/mol) :

[tex]\tt mol=\dfrac{0.95}{32}=0.03[/tex]

For 2 mol S, the entalphy = -790kJ

The enthalpy change for 0.03 mol :

[tex]\tt \dfrac{0.03}{2}\times -790~kJ=-11.85~kJ[/tex]

The enthalpy change accompanying the reaction will be "-11.85 kJ".

Given:

Value of ΔH°,

According to the question,

→ [tex]2S(s) +3O_2(g) =2SO_3(g)[/tex]

Mol of S will be:

= [tex]\frac{0.95}{32}[/tex]

= [tex]0.03[/tex]

hence,

The enthalpy change for 0.03 mol will be:

= [tex]\frac{0.03}{2}\times -790[/tex]

= [tex]-11.85 \ kJ[/tex]

Thus the answer above is correct.

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Answer:

The negative charges of the surface will be attracted to the positive ends of the water molecule

Explanation:

A water molecule is a polar molecule. This means that the two ends of a water molecule are oppositely charged with one end being positive and the other end being negative.

When the positive end of a water molecule encounters a surface as shown in the attachment, where positive and negative charges are evenly distributed at rest, with the negative charges free to move, the negative charges will be attracted to the positive end of the water molecule due to the principle of electrostatics which states that unlike charges attract, while like charges repel. This means that negative and positive charges are attracted to each other while positive and positive or negative and negative charges are repelled from each other. Therefore, the water molecule will adhere to the surface because of the attraction between opposite charges.

The unlike charges will attract as expected based on the laws of electrostatics.

According to the laws of electrostatics, like charges repel while unlike charges attract. We are told in the question that water is a polar molecule with a positive and a negative end.

If the positive end of water dipole approaches the negative charges on the surface, the unlike charges will attract as expected based on the laws of electrostatics.

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Answer:

Explanation:

THe GrEen OnEs

Answer:

They are in the green "staircase"

Explanation:

these elements are the dividers between metals (on the left of them) and non metals (on the right of them), they have some of the properties of both groups