In an atomic model that includes a nucleus, positive charge is
a
concentrated at multiple sites in an atom.
b
concentrated in the center of an atom.
c
spread evenly throughout an atom.
d
located in the space outside the nucleus.

Answer:

0.302M

Explanation:

Molarity, which is the molar concentration of a solution can be calculated as follows:

Molarity = number of moles (n) ÷ volume (V)

According to this question, 19.5 grams of Be(OH)2 is dissolved in enough water to make a 1.5 L solution.

Using mole = mass/molar mass to calculate the number of moles in 19.5g of Be(OH)2

Molar mass of Be(OH)2 = 9 + (16 + 1)2

= 9 + (17)2

= 9 + 34

= 43g/mol

mole = 19.5/43

mole = 0.453moles

Molarity = n/V

Molarity = 0.453/1.5

Molarity = 0.302M

Answer:

1.5057×10^22 atom

Explanation:

As we

1 mole of argon = 40 g of argon

i.e 40 g of argon = 1 mole of argon

1 g of argon = 1/40 mole of argon

1 mole of argon = 6.023×10^23 atom of argon

1/40 mole if argon = 1/40 ×6.023×10^23

= 1.5057×10^22

The number of atoms of Argon in 1 g would be 1.51 × 10²²

To find out the number of atoms of Argon in 1 g of Argon, the number of moles has to be calculated from which the number of atoms can be derived.

The molecular mass of Argon is 40. The number of moles of Argon is calculated as:

Number of moles of Argon = [tex]\frac{Mass of Argon in grams}{Molecular mass of Argon}[/tex]

Substituting molecular mass as 40 and mass in grams as 1. we get:

Number of moles of Argon = [tex]\frac{1}{40}[/tex] = 0.025 mol

Number of atoms in 1 mole of any substance is given by Avogadro's number as 6.022 × 10²³.

Thus, number of atoms of Argon in 0.025 moles would be

= 0.025 × 6.022 × 10²³

= 0.151 × 10²³ or 1.51 × 10²²

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Answer:

Burning of fossil fuels

Explanation:

Human activities that increase the amount of carbon dioxide in the atmosphere are;

1) Burning of fossil fuels in industrial and  internal combustion engines

2) Depletion of the available forest cover, due to the consumption of wood as a raw material

3) Farming expansion  that lead to clearing of forests for farming

4) Industrial activities such as the production of cement

5) Deforestation to provide land for development including buildings and infrastructure.

Answer:

this is your answer i hope it will help you if this answer is right then folow meChromatography can be quantitatively found by the retention factor. Therefore, the important criterion to use chromatography for separating components of a mixture is the difference in solubility of the liquids.

Answer:

Diatomic molecules contain two atoms that are chemically bonded. If the two atoms are identical, as in, for example, the oxygen molecule (O2), they compose a homonuclear diatomic molecule, while if the atoms are different, as in the carbon monoxide molecule (CO), they make up…

Explanation:

yei hoo arko aaxaina ...

Answer:

Percent yield of ether = 83.18%

Explanation:

Equation of the synthesis reaction of ether from ethanol is given as follows :

2 C₂H₅OH -----> C₂H₅OC₂H₅ + H₂0

Density = mass / volume

Therefore mass = density × volume

Density of ether = 0.7134 g/mL; volume of ether produced = 1.11 L = 1110 mL; Molar mass of ether = 74 g/mol

Mass of ether produced = 0.7134 g/mL × 1110 mL = 791.874 g

Density of ethanol = 0.789 g/mL; volume of ethanol = 1.50 L = 1500 mL; molar mass of ethanol = 46 g/mol

Mass of ethanol reacted = 0.789 g/mL × 1500 mL = 1183.5 g

From the equation of reaction, 2 mole of ethanol produces 1 mole of ether

Mass of 2 moles of ethanol = 2 × 46 = 92 g

Therefore, 92 g of ethanol produces 74 g of ether

1183.5 g of ethanol will produce 1183.5 × 74/92 grams of ether = 951.945 g of ether

Percent yield of ether = actual yield/theoretical yield × 100%

Actual yield of ether = 791.874 g; theoretical yield of ether = 951.945 g

Percent yield of ether = (791.874 g × 951.945 g) × 100 %

Percent yield of ether = 83.18%

C. Yes, if each sample contains 6.02 x 10²³ atoms.

Answer:

I think option two (2) is the correct answer

Answer:

Yes

Explanation:

A rice and sand combination can be separated using the filtering process.

First, we'll employ filtration, which involves filtering rice grains with sand.

RICE Particles that are heavy and large will stay in place, while light and tiny sand particles will fill in the gaps.

Answer:

Nuclear energy gets converted into heat energy during a detonation and is also used in nuclear power plants where the heat energy form the nuclear energy gets converted into mechanical energy by converting water into steam, rotating the turbines and converting that into electrical energy

Explanation:

Or heat engines, such as the internal combustion engine used in cars, or the steam engine. (Heat - Mechanical energy)

A reaction in which reduction and oxidation take place simultaneously known as a redox reaction.

Answer: A decrease in population due to health threats is a possible consequence of decreasing air quality resulting from global warming.

Explanation:

When average temperature of Earth keeps on increasing for a longer period of time due to greenhouse gases, increased level of carbon dioxide and other gases etc then it is called global warming.

As humans use oxygen to sustain which is present in the air. So, when there will occur decrease in air quality that results from global warming then it means more illness or diseases will be there.

Hence, people will tend to die more often because of decrease in the air quality their health is getting affected.

Thus, we can conclude that a decrease in population due to health threats is a possible consequence of decreasing air quality resulting from global warming.

Answer:

A decrease in population due to health threats is a possible consequence of decreasing air quality resulting from global warming.

Explanation:

Hope this helps.

Answer: 143.48 moles of copper will be produced.

Explanation:

We are given:

Number of particles of copper (I) sulfate = [tex]4.32\times 10^{25}[/tex]

According to the mole concept:

[tex]6.022\times 10^{23}[/tex] number of particles is contained in 1 mole of a compound

So, [tex]4.32\times 10^{25}[/tex] number of particles will be contained in = [tex]\frac{1}{6.022\times 10^{23}}\times 4.32\times 10^{25}=71.74mol[/tex] of copper (I) sulfate

The given chemical equation follows:

[tex]Fe+Cu_2SO_4\rightarrow FeSO_4+2Cu[/tex]

By the stoichiometry of the reaction:

If 1 mole of copper (I) sulfate produces 2 moles of Cu

So, 71.74 moles of copper (I) sulfate will produce = [tex]\frac{2}{1}\times 71.74=143.48mol[/tex] of Cu

Hence, 143.48 moles of copper will be produced.

Answer:

Los dos óxidos que forma el cobre son óxido de cobre (I) y óxido de cobre (II) (Cu₂O y CuO, respectivamente).

Explanation:

El cobre posee dos estados de oxidación más comunes, los cuales son +1 y +2.

En contacto con aire el cobre se puede oxidar para dar lugar al óxido cuproso u óxido de cobre (I):

4Cu + O₂ → 2Cu₂O

Dicha oxidación también puede dar lugar a la formación del óxido cúprico u óxido de cobre (II):

2Cu + O₂ → 2CuO

La formación del óxido cúprico se favorece a temperaturas mayores a la del ambiente (por encima de los 300 °C).

Por lo tanto, los dos óxidos que forma el cobre son óxido de cobre (I) y óxido de cobre (II) (Cu₂O y CuO, respectivamente).  

Espero que te sea de utlidad!

Answer:

Acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. These substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.

hope it helps

Sulfur dioxide and nitrogen oxides can contribute to acid precipitation.

A pollutant is a chemical or biological substance which harms water, air, or land quality.

Acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. These substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.

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Answer:

a

Explanation:

I'm not completely sure tho veary sorry if it's wrong

Answer:

the answer is C

Explanation:

as the yeast feeds on sugar and yields the ATP per glucose molecule and Carbon dioxide

Answer:

[tex]\boxed {\boxed {\sf 79,420 \ J}}[/tex]

Explanation:

We are given the mass, a change in temperature, and the specific heat of water. We should use the following formula to solve this problem.

[tex]q=mc\Delta T[/tex]

In this formula, m is the mass, c is the specific heat, and ΔT is the change in temperature.

We know there are 250 grams of water and the specific heat of water is 4.18 J/g · °C.

We are given two temperature, so have to find the change in temperature. This is the difference between the initial temperature and final temperature. The water is heated from 24 °C to 100 °C. Therefore, the initial is 24 and the final is 100.

[tex]\bullet \ \Delta T= T_{final} - T_{initial} \\\bullet \ \Delta T=100 \textdegree C - 24 \textdegree C\\\bullet \Delta T= 76 \textdegree C[/tex]

Now we know all three of the variables and we can substitute them into the formula.

[tex]\bullet \ m= 250 \ g\\ \bullet \ c=4.18 \ J/g \textdegree C \\ \bullet \ \Delta T= 76 \textdegree C[/tex]

[tex]q= (250 \ g)( 4.18 \ J/g * \textdegree C)( 76 \textdegree C)[/tex]

Multiply the first two numbers together. The units of grams will cancel.

[tex]q= (1045 \ J/\textdegree C)(76 \textdegree C)[/tex]

Multiply again. This time, the units of degrees Celsius cancel.

[tex]q= 79420 \ J[/tex]

79, 420 Joules of heat must be added.

Answer:

0.000256

Explanation:

Formula:

Divide the value volume by 1e+6

1 kl equal to 1000000ml

Answer:

the red arrow shows that the change in enthalpy is positive

From the energy diagram, it is clear that, the enthalpy of the reaction is positive and it is an endothermic reaction.

An endothermic reaction is a chemical reaction that absorbs heat from its surroundings, resulting in a decrease in temperature of the surroundings. In other words, energy is taken in by the reaction from the environment.

During an endothermic reaction, the reactants absorb energy in the form of heat, light, or electricity to break the bonds between their atoms and form new bonds to create products.

The amount of energy absorbed by the reactants is greater than the energy released by the products. This energy difference is usually expressed as the enthalpy change (∆H) of the reaction, which is positive for endothermic reactions.

Here, the energy of products is higher than that of reactants and hence option A is correct.

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Answer:

A. 2 chlorine (Cl) atoms

Explanation:

2 chlorine atoms means that chlorine is a gas.

Sodium (Na) reacts with 2 chlorine atoms according to the equation below;

Na(s) + Cl2(g) => NaCl2

Answer:

fluorine is what its looking for

Explanation:

Answer:

1. A constellation is a configuration of stars that form a pattern. True

2. The Little Dipper is a part of the constellation Ursa Major. False

3. The North Star is found in the Little Dipper.True

4. The North Star is also called Merak. False

5. The North Polar Constellations can be seen in the Northern Hemisphere. ales atterns in the night sky constellations .True

8g + 65g = 73g

24g + 38g = 62g

Answer:

1)Na + O2 = > 2NaO

8 g + 65 g = > 73g

2) 2H2 + O2 → 2H2O

24 g + 38g→ 62 g

Answer:

Explanation:

Una manifestación, protesta o marcha es la exhibición pública de la opinión de un grupo activista (económica, política o social), mediante una congregación en las calles, a menudo en un lugar o una fecha simbólicos y asociados con esa opinión.

Answer: Revoke the driver's license for at least 12 months

Explanation:

Chemical tests are used in order to measure the amount of drugs or alcohol that is in the body of a person when the person was arrested. To do this, samples of the urine or blood of the person can be taken and the result will be used to know if the person was driving under the influence of alcohol or not.

If the person refuse a legal chemical test issued by a law enforcement officer, the Division of Motor Vehicles is required to revoke the the driver's license of the person for at least 12 months.

Answer: The molecular weight of the dibasic acid is 89.6 g/mol

Explanation:

Normality is defined as the amount of solute expressed in the number of gram equivalents present per liter of solution. The units of normality are eq/L. The formula used to calculate normality:

[tex]\text{Normality}=\frac{\text{Given mass of solute}\times 1000}{\text{Equivalent mass of solute}\times \text{Volume of solution (mL)}}[/tex]      ....(1)

We are given:

Normality of solution = [tex]\frac{1}{20}=0.05N[/tex]

Given mass of solute = 0.56 g

Volume of solution = 250 mL

Putting values in equation 1, we get:

[tex]0.05=\frac{0.56\times 1000}{\text{Equivalent mass of solute}\times 250}\\\\\text{Equivalent mass of solute}=\frac{0.56\times 1000}{0.05\times 250}=44.8g/eq[/tex]

Equivalent weight of an acid is calculated by using the equation:

[tex]\text{Equivalent weight}=\frac{\text{Molar mass}}{\text{Basicity}}[/tex]   .....(2)

Equivalent weight of acid = 44.8 g/eq

Basicity of an acid = 2 eq/mol

Putting values in equation 2, we get:

[tex]44.8g/eq=\frac{\text{Molar mass}}{2eq/mol}\\\\\text{Molar mass}=(44.8g/eq\times 2eq/mol)=89.6g/mol[/tex]

Hence, the molecular weight of the dibasic acid is 89.6 g/mol