Use gumdrops and toothpicks to build a model of CaCO3. B) Select one color of gumdrop for calcium, a second color for carbon, and a third color for oxygen. Be sure to include a key of your chosen color scheme with your model. C) Use the periodic table to help you determine the number of bonds each atom will form. Step 4: Build models of the products. A) Use gumdrops and toothpicks to build a model of CaO and a model of CO2. B) Be sure to use the same colors of gumdrops for calcium, carbon, and oxygen as you did in Step 3. Include a key of your chosen color scheme with your models. C) Use the periodic table to help you determine the number

Answer:

350.7 g of NaCl

Explanation:

For this reactions our reactants are:

HCl and Na₂CO₃.

Then, the reaction is:

2HCl + Na₂CO₃ →  2NaCl  +  H₂CO₃

2 moles of hydrochloric acid react to 1 mol of sodium carbonate in order to produce 2 moles of salt and 1 mol of carbonic acid.

Ratio is 1:2. 1 mol of sodium carbonate can produce 2 moles of NaCl

Then, 3 moles of carbonate may produce (3 . 2) /1 = 6

We convert the moles to mass to determine the theoretical yield

6 mol . 58.45g /mol = 350.7 g

The theoretical yield of NaCl produced is 350.7 g.

NaCl is a salt, and it is an ionic compound.

The reaction is

\(\rm 2HCl + Na_2CO_3 \rightarrow 2NaCl + H_2CO_3\)

2 mol of HCl reacts with 1 mol of \(Na_2CO_3\) and produces 2 mol of NaCl and 1 mol of \(H_2CO_3\).

The ratio will be \(Na_2CO_3\) : NaCl

                                1 : 2

Then, for 3 mol of \(Na_2CO_3\)

\(\dfrac{3 \times 2}{1} = 6\)

Now, convert the moles to mass

\(6\; mol \times 58.45g /mol = 350.7 g\)

Thus, the theoretical yield produced is 350.7 g.

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Answer:

advantage

Explanation:

Answer:

Explanation:

Polarity is about differencens in electronegativity. CH bonds have around the same electronegativity value so a CH bond is nonpolar. The more CH bonds there are in a molecule, the more nonpolar it is. Since CH3CH2OH has more carbon-hydrogen bonds than CH3OH, it is more nonpolar. With the same reasoning, since CH3OH has less CH bonds, it's more polar.

Both burning food on a stove and dry ice sublimating and becoming a gas are examples of physical and chemical changes.

Physical and chemical changes are two types of changes that occur in matter. A physical change is a change in which the form or appearance of a substance changes, but it does not become a different substance.

On the other hand, chemical change is a change in which one substance is transformed into a new substance with different physical and chemical properties.In the given two changes, burning food on a stove and dry ice sublimating and becoming a gas are the examples of physical and chemical changes.

When food burns on a stove, it changes color and becomes a new substance with different properties. This is an example of a chemical change. Dry ice sublimates and becomes a gas. It is a physical change as the form of dry ice changes, but it does not become a different substance.

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Answer:

D on edge

Explanation:

just took test

The list of elements in order from most conductive to least conductive is; potassium (K), germanium (Ge), selenium (Se).

Conductivity is a property of metals. The more "metallic" an element is, the greater its conductivity.

The most metallic element in the list is Potassium hence it has the highest conductivity (1.4×107 S/m) followed by germanium which is a semiconductor (2000 S/m). Selenium has the least electrical conductivity.

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Fresh feed rate: Let the fresh feed rate be x kmol/hr. Therefore, the recycle stream is 5x kmol/hr.

The combined stream, that is, the reactor feed contains:

x + 5x = 6x kmol/hr. CO in fresh feed = 32% of x = 0.32x kmol/hr, H2 in fresh feed = 64% of x = 0.64x kmol/hr, N2 in fresh feed = 4% of x = 0.04x kmol/hr

Total N2 in the combined stream = 13% of (x + 5x) = 0.13 (6x) = 0.78x kmol/hr

Total fresh feed rate: x + 5x = 6x kmol/hr

Molar flow rate and composition of the purge gas: From the conservation of mass, 100 kmol/hr of methanol is produced. Assuming that all the CO fed to the reactor is converted to methanol, the amount of CO present in the gas leaving the reactor is 0 kmol/hr.

Therefore, the molar flow rate of the gas leaving the reactor is the same as the molar flow rate of H2 fed to the reactor. The molar flow rate of H2 fed to the reactor is: 0.64x kmol/hr.

The total molar flow rate of N2 is 0.78x kmol/hr, out of which 0.13x kmol/hr is in the reactor feed and the remaining 0.65x kmol/hr is in the recycle gas. Therefore, the molar flow rate of N2 in the gas leaving the reactor is:

0.65x kmol/hr.

Therefore, the molar flow rate and composition of the purge gas is:CO = 0 kmol/hrH2 = 0.64x kmol/hr

N2 = (0.78 - 0.65) x = 0.13x kmol/hr

Overall conversion = Methanol produced/Moles of CO fed to the reactor

Moles of CO fed to the reactor = 32/100 * Fresh feed rate= 0.32x kmol/hr

Methanol produced = 100 kmol/hr

Overall conversion = 100/0.32x = 312.5 / x

Single pass conversion is not given.

Fresh feed rate = 312.5 kmol/hr

Molar flow rate and composition of the purge gas: CO = 0 kmol/hr; H2 = 0.64x kmol/hr; N2 = 0.13x kmol/hr

Overall conversion = 312.5 / x

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Answer:

A common effect of UV radiation is erythema or sunburn.

Explanation:

This happens when skin cells are damaged by the absorption of energy from UV rays.

Answer:

A common effect of UV radiation is erythema or sunburn.

Explanation:

This happens when skin cells are damaged by the absorption of energy from UV rays.

Answer:

Herbivores would increase causing producers to decrease.

Explanation:

If the carnivores are gone, herbivores wouldn't get eaten and increase, and more herbivores mean less producers available.

A temperature of -280°C is impossible because it is below absolute zero which is the lowest possible temperature that can be reached.

Absolute zero is defined as -273.15°C or 0 Kelvin.

Answer:

\(\boxed {\tt 944.748 \ grams}\)

Explanation:

The formula for density is:

\(d=\frac{m}{v}\)

Rearrange the formula for mass, m. Multiply both sides by v.

\(d*v=\frac{m}{v} *v\)

\(d*v=m\)

Mass is found by multiplying the mass by the volume.

The density of the gold is 19.32 grams per cubic centimeter. The volume is 48.9 cubic centimeters.

\(d= 19.32 \ g/cm^3 \\v=48.9 \ cm^3\)

Substitute the values into the formula.

\(m= 19.32 \ g/cm^3 *48.9 \ cm^3\)

Multiply. Note the centimeters cubed will cancel out.

\(m= 19.32 \ g * 48.9\)

\(m= 944.748 \ g\)

The mass of the gold is 944.748 grams.

Explanation:

green is dominate and theres a G in each box that makes it all Green

Answer:

Explanation:

Reactants                                    Product

H = 2                                          H=2

Cl=2                                             Cl=2      

Zn=1                                            Zn=1    

Total number of atoms  5            Total number of atoms  5    

Answer:

SF6

Explanation:

Octet Rule

The central atom covalent bounds with 6 flourine atoms.

Answer:

Oxygen

Explanation:

Given the following question:

The following atom has 7 protons (plus charge)
The following atom has 8 neutrons (negative charge)
The following atom has 7 electrons since the number of electrons are equal to the number of protons the atom has.

The following atom is oxygen with a mass number of 16: (see photo below)
Let the red represent protons...
Let the gray represent the neutrons...
Let the blue represent the electrons...

Hope this helps.

Answer:

Dihydrogen Dioxide

The name of binary molecule H₂O₂ is also known as hydrogen peroxide and is a popular disinfectant for cuts or scrapes is dihydrogen dioxide. The correct option is A.

Dihydrogen dioxide is the substance of water with extra oxygen molecules. In the dihydrogen monoxide parody, water is referred to by a strange scientific term, most frequently "dihydrogen monoxide,". It is a poisonous gas, and it is leading to the death of many people in America. It is known as DHMO.

Some of its characteristics are listed in an especially ominous manner, such as speeding up corrosion and inducing asphyxia. This substance, commonly referred to as hydrogen peroxide, is used frequently as a disinfectant for cuts and scrapes.

Thus, the correct option is A. Dihydrogen dioxide.

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The statement provided in the question describes Charles's gas law.

Charles's law states that at constant pressure, the volume of a fixed amount of gas is directly proportional to its absolute temperature (measured in Kelvin). In other words, as the temperature of a gas increases, the volume will also increase proportionally, and vice versa.

This law is important in understanding the behavior of gases in various situations, such as in weather patterns and in engineering applications. For example, it is used to explain why hot air balloons rise when heated, as the heated air expands and becomes less dense, causing it to rise above the denser, cooler air.

It is important to note that while Charles's law specifically applies to constant pressure, there are other gas laws that describe the behavior of gases under different conditions, such as Boyle's law which describes the relationship between pressure and volume at constant temperature.

In conclusion, the statement provided describes Charles's gas law, which states that at constant pressure, the volume of a gas will increase in proportion to the change in temperature.

The statement "As a gas is heated under constant pressure, its volume will increase in proportion to the change in temperature" is a description of Charles's gas law (option C). This law is an essential part of understanding gas behavior, and it demonstrates the relationship between the volume and temperature of a gas when the pressure is held constant. In other words, as the temperature of a gas increases, the volume of the gas will also increase proportionally, and vice versa.

Charles's gas law is often represented by the equation V1/T1 = V2/T2, where V1 and V2 are the initial and final volumes of the gas, and T1 and T2 are the initial and final temperatures (measured in Kelvin) of the gas, respectively. This law can be applied in various practical situations, such as when studying the behavior of gases in engines, balloons, or other closed systems where the pressure is constant.

In contrast, Dalton's law of Partial Pressures (option A) is related to the total pressure of a mixture of gases, Boyle's gas law (option B) concerns the relationship between the pressure and volume of a gas at constant temperature, and the Ideal gas law (option D) combines the relationships between pressure, volume, temperature, and the number of gas particles to describe the overall behavior of an ideal gas.

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The prefixes gluc/o and glyc/o both refer to sugar.

The explanation for this is that both prefixes are derived from the Greek word "glykys," which means sweet. Gluc/o is typically used to refer to glucose, which is a simple sugar that is the primary source of energy for the body.

Glyc/o is a more general term that can refer to any type of sugar, including complex carbohydrates like starches.

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The prefixes gluc/o and glyc/o both refer to glucose or sugar.

Both prefixes are derived from the Greek word "glykys," which means sweet. Gluc/o is commonly used in scientific terminology, while glyc/o is often used in medical terminology.
In medical terminology, the prefixes gluc/o and glyc/o are used interchangeably to denote glucose, which is a simple sugar and an essential source of energy for living organisms. These prefixes are commonly used in words related to glucose metabolism and its related conditions, such as glycemia (blood sugar level) or glucagon (a hormone that raises blood sugar).
In summary, gluc/o and glyc/o are prefixes that represent glucose or sugar in medical terms, and they are used to describe various aspects of glucose metabolism and related conditions.

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Explanation:

Hydrogen is a very special element of the periodic table and doesn't belong to any family. While hydrogen sits in Group I, it is NOT an alkali metal.

The strongest nucleophile in DMF is I-

In the solvent dimethylformamide (DMF), the strength of halide nucleophiles follows the trend: I- > Br- > Cl- > F-. This trend is due to the polarizability of the halide ions, which increases down the group as the size of the halogen increases.

Iodide ion (I-) is the strongest nucleophile in DMF due to its large size and high polarizability, which allows it to form strong bonds with other atoms or ions. In contrast, fluoride ion (F-) is the weakest nucleophile in DMF due to its small size and high electronegativity, which makes it difficult to form bonds with other atoms or ions.

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The concentration of the acid used in titration is 0.05056 M

To determine the concentration of the acid, we first need to calculate the number of moles of NaOH used in the titration. We can do this using the volume and concentration of the NaOH solution,

moles NaOH = concentration NaOH × volume NaOH

moles NaOH = 0.1 M × 12.640 mL / 1000 mL/L

moles NaOH = 0.001264 mol

Since the reaction between the acid and NaOH is 1:1, the number of moles of the acid is also 0.001264 mol. Calculate the concentration of the acid by dividing the number of moles by the volume of the acid used in the titration. Let's assume we used 25 mL of acid in the titration,

concentration acid = moles acid / volume acid

concentration acid = 0.001264 mol / 25 mL / 1000 mL/L

concentration acid = 0.05056 M

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--The complete question is, In this activity you will use the virtual lab to determine the concentration of a strong monoprotic acid. To do this, you can perform a titration using NaOH and phenolphthalein found in the virtual lab. (Note: The concentration of the acid is between 0. 025M and 2. 5M so you will need to dilute the NaOH solution so that the volume to reach the endpoint is between 10 and 50 mL). Once you have determined the concentration of the acid, please enter your answer into a form at the bottom of this page. End point volume is 12.640 ml.--

Answer:

w

Explanation:

w

Chemical formula of acetaminophen is C₈H₉NO₂, this drug is also called as paracetamol and is used as a pain killer or an analgesic.

Chemical  formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols  of elements. It also makes use of brackets and subscripts.

Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form  is called empirical formula.

It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.

There are four types of chemical formula:

1)empirical formula

2) structural formula

3)condensed formula

4)molecular formula

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The  type of bonding between sodium and chloride ions in sodium chloride is ionic bonding.

Ionic bonding or electrovalent bonding is a type of bonding which is formed between two elements when there is an exchange of electrons which takes place between  the atoms resulting in the formation of ions.

When the atom looses an electron it develops a positive charge and forms an ion called the cation while the other atom gains the electron and develops a negative charge  and forms an ion called the anion.

As the two atoms are oppositely charged they attract each other which results in the formation of a bond called the ionic bond.

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The molecular mass of 3.6 moles of H₂SO₄.

So let us first calculate the molecular mass of 1 mole of H₂SO₄ and then when we calculate the molecular mass of 1 mole of H₂SO₄, we will calculate the molecular mass of 3.6 moles of H₂SO₄ by multiplying the molecular mass of 1 mole of H₂SO₄ by 3.6

Molecular mass of 1 mole of H₂SO₄ = 2*(molecular mass of Hydrogen) + (molecular mass of Sulphur ) + 4*(molecular mass of oxygen )

Molecular mass of 1 mole of H₂SO₄ = 2*1 + 32 + 4*16 = 98 grams

Mass of 3.6 moles H₂SO₄ = 3.6*98 =352.8 grams

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The force of gravity acting on Earth is greater than the force of gravity acting on the cannonball. Option C  is correct.

This is because according to Newton's third law of motion, for every action there is an equal and opposite reaction. When the cannonball is released or fired, it experiences a force of gravity pulling it towards Earth. However, Earth also experiences an equal and opposite force of gravity pulling it towards the cannonball.

Since Earth has a much greater mass than the cannonball, the force of gravity acting on it is much stronger than the force acting on the cannonball. Therefore, the cannonball appears to fall towards Earth, while Earth remains relatively stationary. Option C  is correct.

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Answer:

150

Explanation:

300 divided by 2

When doping Si with Boron at 300k, the electron concentration in it will be \(10^14 cm ^(-3)\) according to the effect of the dopant theory.

Born induces an acceptor level band in the bandgap of silicon as it is a third-group element. The equilibrium condition when we introduce a dopant like boron (B) is given by:

\(n × p = n_i^2 ×(q × (E_f - E_i) / (k × T))\)

q = elementary charge,

E_f = Fermi level,

E_i = intrinsic energy level,

k = Boltzmann's constant,

T= temperature.

By the effect of the dopant, we can find the electron concentration in silicon (Si).

temperature= 300 K

Doping concentration ( nₐ) = \(10^14 cm ^(-3)\)

Intrinsic carrier concentration = \(1.5 × 10^10 cm^(-3)\) (For silicon at 300 K )

In the presence of boron doping, the concentration of holes increases

The new concentration of holes = nₐ,

⇒ \(10^14 cm ^(-3)\)

n = nₐ

n =  \(10^14 cm ^(-3)\)

⇒ \(10^14 cm ^(-3)\)

Therefore, the electron concentration in silicon at 300 K with a boron doping concentration will be \(10^14 cm ^(-3)\).

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The volume (in liters) in which 9.87 moles of ozone, O₃ can occupy is 221.09 liters

From the question given above, the following data were obtained:

The volume of 9.87 moles of ozone, O₃ can be obtained as illustrated below:

From the ideal gas theory, we understood that:

1 mole of ozone, O₃ = 22.4 Liters

Therefore,

9.87 moles of ozone, O₃ = (9.87 moles × 22.4 Liters) / 1 mole

9.87 moles of ozone, O₃ = 221.09 liters

Thus, we can conclude that the volume is 221.09 liters

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