The diagram below shows the geometric structure of the molecule of water H2O what do the symbols (the bigger gray circle) and (the smaller black circle) represent in the model?

1) genetic material

2) cells

3) chemical bonds

4) atoms

A population is a group of individuals of the same species living in a particular area at the same time.

The whole number of people or inhabitants in a country or region.

A population is the number of living people that live together in the same place. A city's population is the number of people living in that city. These people are called inhabitants or residents. The population includes all individuals that live in that certain area.

Hence, a group of organisms of the same species that live in an area is called a population.

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Answer:

D. Selenium

Explanation:

If you are talking about elements with a neutral charge, i.e. just usual elements and not ions whatsoever, then we have five elements who match the criteria. They are oxygen (o) sulfur (s) selenium (se) tellurium ( T e ) polonium ( P o )

Answer:

0.714 moles

Explanation:

whenever you see  × 10^23 molecules

its an Avogadro's number question

Avogadro's number is 6.02214076×10²³

1 mole is 6.02214076×10²³ molecules

4.3 × 10²³ molecules divided by 6.02214076×10²³ molecules per mole =

4.3 × 10²³ ÷ 6.02214076×10²³ =

0.71403179888 moles

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Answer:

5.6 m which is molarith this solution

Answer:

See below

Explanation:

From periodic table, find Mole Weight of the element in question

 this is the grams of the element in Avagadro's Number (6.022 x 10^23)  of atoms

   (5.50 x 10^22) / (6.022 x 10^23)  x mole weight = grams

Answer: 13.9

Explanation:

LiOH is a base, so the pOH is given by [tex]-\log(0.8)=0.0969[/tex].

So, since pOH + pH = 14, the pH is 14-0.0969, which is about 13.9

The cost of using 14,400 watts hour would be  $43.2.

Energy is defined as the capacity to do work.

It is given in the question that

A 1600 watts electric oven is used for 9 hours

Power * Time

power = 1600 watts

Time = 9 hours

Total energy consumed = 1600 watts * 9 hours
= 14,400 watts hour

energy is measured in Kilowatts hour

= 14,440 watts hour

14,440/1000 kwh

= 14.4 kwh

It is given that the cost per unit of energy is $3.00 per kwh

Therefore , the cost of using 14,400 watts hour would be 14.4 * 3

= $43.2

The function of Voltmeter and Ammeter is to measure Voltage and Current respectively.

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The mathematical equation for the ideal gas law is PV = nRT.

The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).

(A)

PV = nRT

The ideal gas equation is formulated as: PV = nRT. In this equation, P refers to the pressure of the ideal gas, V is the volume of the ideal gas, n is the total amount of ideal gas that is measured in terms of moles, R is the universal gas constant, and T is the temperature.

(B)

Where the pressure - P, is in atmospheres (atm) the volume - V, is in liters (L) the moles -n, are in moles (m) and Temperature -T is in Kelvin (K) as in all gas law calculations.

(C)

A. Boyle's law

B. Charles's law

C. Avogadro's law

D. Dalton's law

____ [tex]- P_1V_1[/tex] = [tex]P_2 V_2[/tex]

____ [tex]\frac{V}{T}[/tex] = k

____ [tex]\frac{V_1}{T_1}[/tex] = [tex]\frac{V_2}{T_2}[/tex]

____ V = kn

____ PV = k

____- P total = [tex]P_1 + P_2 + P_3 + ...[/tex]

Boyle's law [tex]- P_1V_1[/tex] = [tex]P_2 V_2[/tex]

Charles's law - [tex]\frac{V}{T}[/tex] = K

Charles's law - [tex]\frac{V_1}{T_1}[/tex] = [tex]\frac{V_2}{T_2}[/tex]

Avogadro's law- V = kn

Boyle's law - PV = k

Dalton's law - P total = [tex]P_1 + P_2 + P_3 + ...[/tex]

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Answer:

Molecular solids and covalent network solids are two types of solid compounds. The key difference between molecular solid and covalent network solid is that molecular solid forms due to the action of Van der Waal forces where as covalent network solid forms due to the action of covalent chemical bonds.

hope this helps

The protraction of this reaction would over time lead to attainment of equilibrium and appearance of N2O4.

The  term equilibrium refers to the point where the forward and the reverse reactions proceed at the same rate.

Hence, the reaction will reach equilibrium if the reaction continues for a long time, then some N2O4 molecules will begin to appear in the system.

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An element in group 6A, period 3 with an atomic number of 16 would be brittle in nature.

Brittleness is the characteristic of a substance to break easily when hit with an object or against an object.

The element with the atomic number 16 is sulfur. Sulfur does not conduct heat nor electricity and neither can it be turned into wire.

Sulfur exists naturally as a brittle solid that is yellow in appearance.

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Hi!In an Ionic bond a metal gives a valence to a cation.

Answer:

On treatement of 2 -with hydrogen gas and lindlar catalyst, the major product obtained is cis-2butene.

Answer:

2.0 M

Explanation:

molarity = (moles of solute)/(liters of solution)

molarity = 0.25/0.50 = 2.0 M

Answer:

The two factors that determine whether a reaction is spontaneous are:

Enthalpy: When the reaction gives off energy, then the reaction is said to be spontaneous.

Entropy: It is the measure of randomness in a system. As the randomness of the reaction increases, the spontaneous is the reaction.

That's it

Hope's It's Help

Answer: 20 grams

Explanation:

[tex]10=\frac{\text{grams of KOH}}{200}\\\text{grams of KOH}=20[/tex]

The biological molecules that transport other substances are the proteins.

Proteins are biological macromolecules that contains nitrogen in their molecules and are the building block of a living organism.

The proteins perform the following functions:

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Answer:

X

Explanation:

X is the reactant and Y is the product

During an asthma attack temperature can be decreased to increase the volume of the airway.

This law describes how a gas expands as the temperature increases; conversely, a decrease in temperature will lead to a decrease in volume.

[tex]\rm \dfrac{V'}{T'} = \dfrac{V}{T}[/tex]

which means volume is inversely proportional to temperature so the temperature can be decreased in the atmosphere to increase volume of the airway.

This means that, when you inhale cold air, it will change volume as it warms in passing through the sinuses.

As the air warms it expands to a larger volume.

Therefore during an asthma attack temperature can be decreased to increase the volume of the airway.

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The maximum volume of hydrogen evolved at room temperature and prressure after taking excess zinc with 0.01 mol HCl is 2.4 [tex]dm^{3}[/tex]

hence correct option is (C)

According to this law, the product of the pressure and the volume of one gram molecule of an ideal gas is equal to the product of the absolute temperature of the gas and the universal gas constant.

Given Equation ;

Zn + 2HCl --> [tex]ZNCl_2[/tex] + [tex]H_2[/tex]

Given Quantities ;

Amount of Zinc = Excess

Amount of 1.0 mol/ltr HCl = 100 ml

It means, Number of moles of H = 0.1 mole

Temperature = 298 K

Pressure = 1 Atm

This is a “single state” problem, so we can solve it using the ideal gas law, PV = nRT.

therefore, using Ideal gas equation ;

PV=nRT

1 x V = 0.1 x 0.0821 x 298

volume of hydrogen gas = 2.4 litre ie, 2.4 [tex]dm^{3}[/tex]

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The image is attached with the answer.

Isomers are compounds which have same empirical formula , same number of atoms are present but they have difference in arrangement if the atoms.

It is given that

There are four cis, trans isomers for 2-isopropyl-5-methylcyclohexanol

the cis, trans designations of the substituents are made relative to the oh group

The image is attached with this answer.

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One system must have higher kinetic energy than the other system is the correct statement.

Conduction is the process by which heat is transmitted through the material of a substance when there is a difference of temperature between two bodies.

So we can conclude that One system must have higher kinetic energy than the other system is the correct statement.

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Heat flow by conduction requires that the two systems must not be touching each another.

Heat energy is a form of energy that exists due to a temperature difference between two objects.

Heat energy flows from an object at higher temperature to an object at a lower temperature.

Heat transfer by conduction involves the vibration of particles of the medium transferring heat due to contact between the two objects.

Therefore, heat flow by conduction requires that the two systems must not be touching each another.

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The properties of alkaline earth metals include

Alkaline earth metals are the metals that occupies the group two in the periodic table. They include the following:

The properties include the following:

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Answer:

Alkaline metals have valency 2, they have 2 valence electrons, their oxides are basic in nature, and they are electropositive. Alkaline metals are not found in nature alone.

Explanation:

These artificial homes preserve the resources in the animal's environment and increases population size.

This is defined as the number of organisms in a population at a given place and time.

Since the resources used are artificial, they are preserved with an increase in the population due to reproduction.

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Answer:

A single carbon pool can often have several fluxes both adding and removing carbon simultaneously. For example, the atmosphere has inflows from decomposition (CO2 released by the breakdown of organic matter), forest fires and fossil fuel combustion and outflows from plant growth and uptake by the oceans.

Explanation:

The volume would be three times the original volume is the correct answer.

The volume would be three times the original volume because a reaction produced 3 moles of gas from 1 mole of gaseous reactants. The ratio between reactants and products are 1:3 which shows that three times increase occur in the volume between reactant and products.

So we can conclude that the volume would be three times the original volume is the correct answer.

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Answer:

Percent Composition

1. Find the molar mass of all the elements in the compound in grams per mole.

2. Find the molecular mass of the entire compound.

3. Divide the component's molar mass by the entire molecular mass.

4. You will now have a number between 0 and 1. Multiply it by 100% to get percent composition.

2.59 atm is the pressure inside the flask if 6 grams of nitrogen gas is introduced into an evacuated 2 L flask at 28 degrees celsius.

The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).

The computation of the pressure inside the flask is shown below;

As per the ideal gas law

we know that

P V = nRT

where

V = 2 L

T = 28 degrees celsius +273 = 301 K

m= 6 grams

R = 0.0821

Now moles of [tex]N_2[/tex] is

= 6 grams ÷ 28

= 0.21 mol

Now

P = nRT ÷ V

= (0.21 mol × 0.0821 × 301 K) ÷ 2 L

= 2.59 atm

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