which element has a crystalline lattice through which electrons flow freely

Answer:

The number of mole is 2.422 moles

Explanation:

To calculate the number of mole, we have to use the formula n = m /Mm

n - moles

m - mass

Mm - molar mass

Let's calculate the molar mass of the compound SiO2

Si - 28.0855

O - 15.999

Note: there are two atoms of oxygen in the compound

Mm of SiO2= 28.0855+ 2* 15.999

= 60.0835g/mol

Now, we calculate the number of moles

n = 145.54g/ 60.0835g/mol

= 2.422mol

Answer:

low pressure which means means stormy weather

Explanation:

welcome to brainily, and hope this helps

Answer:

Low pressure

Explanation:

When there is a L it means low pressure which means rainy weather.It usually brings lots of rain and wind.

Answer:

The molarity is 2, 408M

Explanation:

A solution molar---> moles of solute in 1 L of solution (1000ml):

120ml solution --------0,289 mol FeCl3

1000ml solution-------x= (1000ml solutionx0,289 mol FeCl3)/120 ml solution

x=2,408mol FeCl3--> 2, 408M

Final answer:

The molarity of the FeCl3 solution is 2.41 M.

Explanation:

To calculate the molarity of 0.289 moles of FeCl3 dissolved in 120 ml of solution, we need to convert the volume of the solution to liters. 120 ml is equal to 0.120 L. Molarity is defined as the number of moles of solute divided by the volume of solution in liters. Therefore, the molarity of the FeCl3 solution is:

Molarity = moles of solute/volume of solution

Molarity = 0.289 moles FeCl3 / 0.120 L solution = 2.41 M.

Answer:

If the attractive forces in a substance is much less than the

molecular motion, then the substance will be in a "Gaseous" state.

Explanation:

When decreasing the attractive forces in a substance and making it "much" less than the molecular motion in the substance, the substance should be in a gaseous state.

When the average kinetic energy of a substance or object is small enough that the attractive forces is stable enough to hold all of the particles close together, the molecules in liquids and solids do not move apart.

If the average kinetic energy of a substance or object is great enough (greater than the attractive forces) to overpower the attractive forces between them, the molecules are able to move apart. This would mean that the substance is in a gaseous state.

Overall, if the attractive forces are less than the molecular motion then the molecular motion will over power the attractive forces, breaking the molecules apart and letting them move freely as molecules in a gaseous substance would.

If  the  forces of attraction are less than the molecular motion , then substance will be in gaseous state.

Forces of attraction  is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different  states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

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Answer:

Option B. 25 kPa

Explanation:

First, let us calculate the number of mole of CO2 in the container. This is illustrated below:

Molar Mass of CO2 = 12 + (2x16) = 12 + 32 = 44g/mol

Mass of CO2 = 0.22g

Number of mole of CO2 = 0.22/44 = 0.005mol

From the question, we obtained the following data:

V = 0.5L

T = 305K

R = 0.082atm.L/K /mol

n = 0.005mol

P =?

PV = nRT

P = nRT/V

P = (0.005x0.082x305)/0.5

P = 0.2501atm

Recall:

1atm = 101325Pa

0.2501atm = 0.2501 x 101325 = 25341.4Pa = 25341.4/ 1000 = 25KPa

Answer:

12.89 moles

Explanation:

Before we solve the question, we have to balance the equation of the reaction first. The balanced reaction will be:

2 NO + 2 H2→ N2 + 2 H2O

There are 180.5g of N2 produced, the number of produced in moles will be: 180.5g / (28g/mol)= 6.446 moles

The coefficient of H2 is two and the coefficient of N2 is one. Mean that we need two moles of H2 for every one mole of N2 produced. The number of H2 reacted will be: 2/1 * 6.446 moles = 12.89 moles

Reactant C should be considered as the limiting reactant in this given situation.

Since

A balanced chemical reaction is:

A + 2B + 3C → 2D + E

And, number of moles should be

A = 0.50 mole

B = 0.60 moles

C = 0.90 moles

Now here we considered A as the reactant

So,

1 mole of A reacted to form 2 moles of D

0.50 moles of A will produce  = 1 mole of D

Now considered  B as the reactant

2 moles of B reacted to form 2 moles of D

0.60 moles of B reacted to form x moles of D

x = 2 moles of D is produced.

Now considered C as the reactant:

3 moles of C reacted to form 2 moles of D

O.9 moles of C reacted to form x moles of D

= 0.60 moles of D is formed.

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Answer:

cell - basic unit of structure and function of all living things

tissue - a group of cells that work together to perform a common function

organ - a group of tissues that work together to perform a common function

organ system - group of organs that work together to perform a common function

Explanation:

What you have there is the biological level of organization. It is how living things are organized from the simplest to the most complex. Each level makes up another level.

As you can see in your exercise, the basic unit of life is the cell and cells make up tissues, while tissues make up organs and so forth. There are higher levels of organizations passed organ system.

Cell - tissue - organ - organ system - organism - population - community - ecosystem - biosphere

Answer:

4- A material that transfers heat energy more easily than another material will experience a greater rate of thermal energy loss than an object that does not transfer heat energy easily.

Explanation:

Thermal energy loss has to do with loss of heat energy by a body to another body or its environment. The aim of the process is usually the attainment of thermal equilibrium between the body and its environment.

On a cold day, a material that transfers thermal energy more easily will loose thermal energy faster than an object that does not transfer thermal energy. The rate of heat transfer of a body determines its rate of loss of thermal energy.

The correct statement is 4. A material that transfers heat energy more easily than another material will experience a greater rate of thermal energy loss than an object that does not transfer heat energy easily.

To understand why option 4 is correct, let's consider the principles of heat transfer. Heat energy can be transferred in three ways: conduction, convection, and radiation. A material that transfers heat energy more easily is a better conductor of heat. This means that it allows heat to move through it more readily, either from a warmer to a cooler region or vice versa.

 On a cold day, an object's thermal energy will naturally tend to flow towards the cooler surroundings because of the temperature difference. If the material of the object is a good conductor of heat (i.e., it transfers heat energy more easily), it will lose its thermal energy to the environment at a faster rate compared to a material that is a poor conductor of heat (an insulator). This is because the good conductor does not impede the flow of heat energy, allowing it to move towards the colder surroundings more quickly.

 Conversely, a material that does not transfer heat energy easily, such as an insulator, will impede the flow of heat energy. This means that less thermal energy will be lost from the object to the environment over a given period of time, thus minimizing thermal energy loss.

Let's analyze the incorrect options:

 1. This statement is incorrect because a material that transfers heat energy at any rate will experience a change in thermal energy. If it transfers heat energy to its surroundings, it will lose thermal energy, not maintain the same level of energy.

 2. This statement is the opposite of the correct principle. A material that transfers heat energy more easily will actually lose thermal energy faster, not slower.

3. This statement is incorrect because a material that transfers heat energy at any rate will not necessarily experience an increase in thermal energy. On a cold day, the material will lose heat energy to its surroundings, not gain it.

 In summary, to minimize an object's thermal energy loss on a cold day, one should use materials that do not transfer heat energy easily, as they will resist the flow of heat away from the object, thus keeping it warmer for a longer period of time.

Answer:

   ..                                ..

   ..                                 ..

Explanation:

The Lewis dot structure of N2Br4 is attached below. A Lewis dot structure is also known as a Lewis structure or electron dot structure.

It is a visual representation of the valence electrons in an atom or molecule. It uses dots to represent the valence electrons around the atomic symbol.

The Lewis dot structure is based on the octet rule, which states that atoms tend to gain, lose, or share electrons in order to achieve a stable electron configuration with eight valence electrons (except for hydrogen, which typically only requires two valence electrons).

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The scientific notation for the value  [tex]\frac{9 \times 10^9}{4.5 \times 10^1}[/tex] is  2  [tex]\times[/tex]  10 ^8 .

Explanation:  

                            a ^x  / a^ y  =  a ^(x  −  y )

                                            = 9  ×  10 ^9  / 4.5  ×  10 ^1

                                            =  9  / 4.5  ×  10 ^(9 − 1)

                                            = 2  [tex]\times[/tex]  10 ^8

     The scientific notation for the value  [tex]\frac{9 \times 10^9}{4.5 \times 10^1}[/tex]  is 2  [tex]\times[/tex]  10 ^8 .

Answer: I believe it is coal

Explanation: Coal is the most polluting fossil fuel

Answer:

coal (a)

Explanation:

Answer:

b.Beta

Explanation:

mass number remains constant while atomic number has been increased by 1 unit . beta is electron like element where its mass number is 0 and atomic number is -1.

The nuclear radiation being is emitted in the given radioactive decay is beta radiation.

Beta radio decay :

It is the type of radioactive decay in which negative beta particles and are emitted resulting in isobaric nucleus with 1 extra proton.

Characteristics

In the picture atomic number is increased by one but atomic mass remains the same.

Therefore, the nuclear radiation being is emitted in the given radioactive decay is beta radiation.

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The value of "d" is 80°

Explanation:

Cyclic quadrilaterals are the special group of quadrilaterals with all its base lying on the circumference of the circle. In other words, a quadrilateral inscribed in a circle is called a cyclic quadrilateral.

Cyclic quadrilateral are characterised by some special features such as

Using the property 1  

We find that since the quadrilateral is cyclic, opposite pairs must be supplementary

100° +∠D must be equal to 180°  

D=180° -100° =80°

This response uses the concept of a mole and the principles of molar mass to calculate the number of atoms in various substances as well as the corresponding molar masses for different elements.

To solve these problems, we need to understand the concept of a mole. A mole is a quantity in chemistry that helps us count entities at the atomic and molecular scale. One mole equals Avogadro's number (6.02214076 x 10^23 entities).

Also, one mole of any element in grams is equal to its molar mass (usually found under the symbol in the periodic table).

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Answer:

Explanation:

The specific heat of a substance is the amount of heat required to the raise the temperature of a unit mass of substance by 1°C.

This physical quantity is usually determined in the laboratory. It is an intensive property of substances and a constant for pure samples of material.

Specific heat for the steel wire    0.82J/g°C

specific heat for the steel wire    0.47J/g°C

specific heat for the lead pellets    0.25J/g°C

Specific heat has been defined as the amount of heat required to raise the temperature of 1 gram of substance by 1 degree Celsius.

It has been a physical quantity and has been directly proportional to the motion of molecules.

The increase in mass of the substance results in the increase in the attraction force and thus the motion of the atoms has been slow down. Thus, with the increase in mass of the element, the specific heat decreases.

The specific heat of the following elements has been:

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Answer:

2.71 × 10^24 molecules

Explanation:

We are given;

Moles of CO₂ as 4.5 moles

We are required to determine the number of molecules

From the Avogadro's constant;

1 mole of a molecular compound contains 6.022 × 10^23 molecules

Therefore;

Molecules of CO₂ = Moles of CO₂ × Avogadro's constant

That is;  

               = 4.5 moles × 6.022 × 10^23 molecules/mole

               = 2.71 × 10^24 molecules

Hence, 4.5 moles of CO₂ contains 2.71 × 10^24 molecules

Avogadro's constant is a proportionality factor, which relates to the number of units in one mole of any substance. The value of Avogadro constant is 6.022 [tex]\times 10^{23}[/tex].

Given that:

Moles of CO₂ = 4.5 moles

Number of molecules = ?

Avogadros constant = 6.022 [tex]\times 10^{23}[/tex]

Molecules in the Carbon dioxide can be calculated as:

Molecules of CO₂ = Moles of carbon dioxide x Avogadro constant

Molecules of CO₂ = [tex]4.5\times 6.022[/tex] [tex]\times 10^{23}[/tex]

Molecules of CO₂ = [tex]2.71 \times 10 ^{24}[/tex] molecules

Thus, the 4.5 moles of carbon dioxide will have  [tex]2.71 \times 10 ^{24}[/tex] molecules.

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Answer:

12.9

Explanation:

From the question given, the concentration of the hydroxide ion is given:

[OH^-] = 1.4 x 10^ -13M

pOH =?

pOH = —Log [OH^-]

pOH = —Log 1.4 x 10^ -13

pOH = 12.9

Answer:

110.76 are the grams I think?

Explanation:

Answer: 1008 metres

Explanation:

speed of swimmer = 2.8 m/s

Time taken = 6minutes

(since speed is in metres per second, convert time in minutes to seconds

If 1 minute = 60 seconds

6 minute = 6 x 60 = 360 seconds

distance = ?

Since, speed is the distance covered divided by time taken in seconds, thus

Speed = distance / time

Distance = speed x time taken

distance = 2.8m/s x 360

= 1008 metres

Thus, the swimmer cover a distance of 1008 metres

Answer:

Corn stalks  

Explanation:

Biomass fuel is produced by living or once-living organisms.

The most common biomass fuels used for energy come from plants, such as corn and soy.

B is wrong. Yellowcake is a refined form of uranium ore.  

C and D are wrong. Coal and natural gas are not biomass fuels.

Answer:

The answer is Cell

Explanation:

Answer:

The answer is cell. A cell is the smallest unit of a living thing.

Answer:

(Fe(OH)2 + Na2SO4

Explanation:

Iron (II) hydroxide precipitate. Iron (II) hydroxide precipitate (Fe(OH)2) formed by adding few drops of a 1M solution of sodium hydroxide (NaOH) to 0.2 M solution ferrous sulfate (FeSO4). The reaction is FeSO4 + NaOH -> Fe(OH)2 + Na2SO4. This is an example of a double replacement reaction. Pure iron (II) hydroxide is white, however even trace amounts of oxygen make it greenish.

Answer:

      [tex]\large\boxed{\large\boxed{x=54\º}}[/tex]

Explanation:

In the figure, two secants that intersect outside a circle form an angle with measure of xº and the measures of the arcs formed are 136º and 28º.

When two secants intersect outside a circle, the measure of the angle formed is one-half the absolute difference of the measures of the intercepted arcs.

Then, you can write and solve this equation:

           [tex]x=\dfrac{1}{2}(136\º-28\º)\\\\\\x=54\º[/tex]

Answer:

i like cheese pizza the best

Explanation:

it smacks

If 10 moles of C3H4 are reacted, 30 moles of CO2 will form and 40 moles of O2 will be consumed.

In the given reaction, C3H4 reacts with 4 O2 to form 3 CO2 and 2 H2O. The stoichiometry of the reaction tells us that for every 1 mole of C3H4 reacted, 3 moles of CO2 are produced. Therefore, if 10 moles of C3H4 are reacted, we can use the ratio of moles to determine the number of moles of CO2 produced, which would be (10 moles C3H4) x (3 moles CO2 / 1 mole C3H4) = 30 moles of CO2.

In the same reaction, 4 moles of O2 react for every 1 mole of C3H4. So if 10 moles of C3H4 are reacted, we can use the ratio of moles to determine the number of moles of O2 consumed, which would be (10 moles C3H4) x (4 moles O2 / 1 mole C3H4) = 40 moles of O2.

30 moles of CO₂ will be formed for 10 moles of C₃H₄ that reacted; 40 moles of O₂ will be consumed.

To determine how many moles of CO₂ will form and how many moles of O₂ will be consumed when 10 moles of C₃H₄ are reacted, we need to use the stoichiometry of the given chemical equation:

[tex]C_3H_4 +4O_2 \rightarrow 3CO_2 +2H_2O[/tex]

Step 1: Moles of CO₂ formed:

One mole of C₃H₄ creates three moles of CO₂ according to the balancing equation.

Therefore, if 10 moles of C₃H₄ are reacted, the moles of CO₂ formed can be calculated as follows:

Step 2: Moles of O₂ consumed:

The balanced equation indicates that 1 mole of C₃H₄ consumes 4 moles of O₂.

Therefore, if 10 moles of C₃H₄ are reacted, the moles of O₂ consumed can be calculated as follows:

This analysis shows that if you start with 10 moles of C₃H₄, you will produce 30 moles of CO₂ and consume 40 moles of O₂ in the reaction.

Answer:

38.7 g

Explanation:

first you find the molar mass of Nickle(II) Perchlorate

Nickle = 58.693 g/mol

Perchlorate is Chlorine and Oxygen combined

Molar mass of chlorine is 35.453 g/mol

Oxygen = 15.999 g/mol but since it has 4 oxygen atoms combined with chlorine you have to multiply 15.999 by 4 which is 63.996 add all the masses together and that gives you 158.142. Since you have moles you multiply the moles by the molar mass which looks like this. 0.245 * 158.142 which equals 38.74479 but with sign figs it is 38.7g as your final answer. Ask me if you are confused about something.

To find the mass of 0.245 moles of nickel(II) perchlorate, first calculate its molar mass by summing the atomic masses of nickel, chlorine, and oxygen, resulting in 257.59 g/mol. Then, multiply the number of moles (0.245) by the molar mass to get 63.11 grams.

To calculate the mass, in grams, of 0.245 moles of nickel(II) perchlorate, we need to determine the molar mass of nickel(II) perchlorate. This involves adding the atomic masses of all atoms in the formula. For nickel(II) perchlorate, Ni(ClO4)2, the calculation is as follows:

Adding these together, the molar mass of Ni(ClO4)2 = 58.69 + 70.90 + 128.00 = 257.59g/mol.

Now, to find the mass of 0.245 moles of nickel(II) perchlorate:

Mass = number of moles × molar mass = 0.245 moles × 257.59 g/mol = 63.11 grams.

Therefore, 0.245 moles of nickel(II) perchlorate has a mass of 63.11 grams.

Answer:

1.395J/g°C

Explanation:

The following were obtained from the question:

Q = 6527J

M = 312g

ΔT = 15°C

C =?

Q = MCΔT

C = Q/MΔT

C = 6527/(312 x 15)

C = 1.395J/g°C

The specific heat capacity of the substance is 1.395J/g°C

The specific heat of the substance is 1.385 J/g·°C. To identify the substance, compare its specific heat with substances listed in Table 5.1.

The specific heat can be calculated using the formula:

specific heat = energy / (mass x temperature change)

In this case, the energy is given as 6527 J, the mass is 312 g, and the temperature change is 15 degrees Celsius. Plugging in these values, we get:

specific heat = 6527 J / (312 g x 15 °C) = 1.385 J/g·°C

The specific heat of the substance is 1.385 J/g·°C.

To identify the substance, we would need to compare its specific heat with substances listed in Table 5.1.

Answer:

The molarity is 0,4M

Explanation:

The molartity is moles of compound (in this case KCl) in 1 liter of solution :

2 L----------0,8 moles KCl

1 L-----------x= (1L x0,8 moles KCl)/2L= 0,4 moles KCl--> 0,4M