Suppose a scientist wants to test a new drug to fight the flu. The scientist injects the drug into 3 people with the flu. The scientist injects a harmless solution into three other people with the flu. In this experiment, what is the variable group and what is the control group?

The mass of Na(s) produced during an enthalpy change +100 kJ ​is -469.55Kj/mol.

Enthalpy is the sum of internal energy of the system and the volume and pressure.

For given reaction, ΔH°= 2(ΔHf)NaOH -2(a14)1 - 120

Substituting all value given

-367.5kj =2(ΔH°f) NaOH- 2x-285.8Kj/mol

(ΔH°f)NaOH=-939.1/2 = -469.55Kj/mol

Thus, the mass of Na(s) produced during an enthalpy change +100 kJ ​is -469.55Kj/mol.

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Answer:

Respiration

I hope this helps!

Answer:

i think the correct answer is A

Answer:

water vapor

Explanation:

the the answer is water vapor

wish in new Explanation:

Answer:

hello lets talk here

Explanation:

Answer:

Ice Cube, Water, and Air

Explanation:

An Ice cube is cloudy so you can't exactly see through it. It's Opaque.

You can't look through water clearly. It's Translucent.

You can see straight through air. It's Transparent.

Hope this helps. Have a nice day you amazing bean child

There are 90.345 x 10^23 molecules in 15 moles of CO2.

Avogadro's number is the number of units, atoms or molecules in one mole of a substance which is equals to 6.02214076 × 1023. This number is also known as the Avogadro constant.

This means that one mole of a substance is equals to 6.02214076 × 1023 atoms, ions or molecules then 15 moles is equals to 90.345 x 10^23 molecules so we can conclude that there are 90.345 x 10^23 molecules are in 15 moles of CO2.

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Answer:

Element

Explanation:

Iron is an element

Answer:

see attachment

Explanation:

see attachment for your answer.

Hope this helps.

-Rishabh

Considering the definition of empirical and molecular formula,  the molecular formula is P₇N₇O₁₄.

The empirical formula is the simplest expression to represent a chemical compound, which indicates the elements that are present and the minimum proportion in whole numbers that exist between its atoms, that is, the subscripts of chemical formulas are reduced to the most integers. small as possible.

The molecular formula is the chemical formula that indicates the number and type of different atoms present in the molecule. The molecular formula is the actual number of atoms that make up a molecule.

In other words, the molecular formula is the actual formula of the molecule and is made up of the symbols that represent the chemical elements and the subscripts that indicate the number of atoms of each element that participate in the formation of the molecule.

In this case, you know:

Assuming a 100 grams sample, the percentages match the grams in the sample. So you have 26.7 grams of P, 12.1 grams of N and 61.2 grams of Cl.

Then it is possible to calculate the number of moles of each atom in the molecule, taking into account the corresponding molar mass:

P: \(\frac{26.7 g}{31\frac{g}{mol} }\)= 0.86 moles

N: \(\frac{12.1 g}{14\frac{g}{mol} }\)= 0.86 moles

O: \(\frac{61.2 g}{35.45\frac{g}{mol} }\)= 1.72 moles

The empirical formula must be expressed using whole number relationships, for this the numbers of moles are divided by the smallest result of those obtained. In this case:

P: \(\frac{0.86 moles}{0.86 moles }\)= 1

N: \(\frac{0.86 moles}{0.86 moles }\)= 1

O: \(\frac{1.72 moles}{0.86 mole}\)= 2

Therefore the P: N: O mole ratio is 1: 1: 2

Then, the empirical formula is P₁N₁O₂= PNO₂, with a empirical mass of 31 g/mol + 14 g/mol + 2× 35.45 g/mol= 115.9 g/mol

The molecular formula can be calculated as MF= n(EF)

where:

In this case, the value n can be calculated:

n= 812 g/mol÷ 115.9 g/mol

Solving:

n= 7

Then, the molecular formula can be calculated as MF= 7×EF

Finally, the molecular formula is P₇N₇O₁₄.

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Answer:

11.1

Explanation:

the only reason i can think of why it wouldn't be 11.111 is improper rounding and sig figs. so if you round with sig figs it would be 11.1

The sum of the given values 0.411, 9.9, and 0.8 is 11.111 which on approximation gives 11.11.

To round the answer appropriately, we need to consider the desired number of decimal places. In this case, we are asked to express the answer numerically using the appropriate number of decimal places.

The sum of 0.411, 9.9, and 0.8 is:

0.411 + 9.9 + 0.8 = 11.11

Rounded to the appropriate number of decimal places, the answer is 11.11.

The answer is calculated using the appropriate number of decimal places.

Therefore, The sum of 0.411, 9.9, and 0.8 is 11.11.

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At equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.

1: Write the balanced chemical equation:

\(C_O\)(g) + \(Cl_2\)(g) ⟶ \(C_OCl_2\)(g)

2: Set up an ICE table to track the changes in moles of the substances involved in the reaction.

Initial:

\(C_O\)(g) = 0.3500 mol

\(Cl_2\)(g) = 0.05500 mol

\(C_OCl_2\)(g) = 0 mol

Change:

\(C_O\)(g) = -x

\(Cl_2\)(g) = -x

\(C_OCl_2\)(g) = +x

Equilibrium:

\(C_O\)(g) = 0.3500 - x mol

\(Cl_2\)(g) = 0.05500 - x mol

\(C_OCl_2\)(g) = x mol

3: Write the expression for the equilibrium constant (Kc) using the concentrations of the species involved:

Kc = [\(C_OCl_2\)(g)] / [\(C_O\)(g)] * [\(Cl_2\)(g)]

4: Substitute the given equilibrium constant (Kc) value into the expression:

1.2 x \(10^3\) = x / (0.3500 - x) * (0.05500 - x)

5: Solve the equation for x. Rearrange the equation to obtain a quadratic equation:

1.2 x \(10^3\) * (0.3500 - x) * (0.05500 - x) = x

6: Simplify and solve the quadratic equation. This can be done by multiplying out the terms, rearranging the equation to standard quadratic form, and then using the quadratic formula.

7: After solving the quadratic equation, you will find two possible values for x. However, since the number of moles cannot be negative, we discard the negative solution.

8: The positive value of x represents the number of moles of \(Cl_2\)(g) at equilibrium. Substitute the value of x into the expression for \(Cl_2\)(g):

\(Cl_2\)(g) = 0.05500 - x

9: Calculate the value of \(Cl_2\)(g) at equilibrium:

\(Cl_2\)(g) = 0.05500 - x

\(Cl_2\)(g) = 0.05500 - (positive value of x)

10: Calculate the final value of \(Cl_2\) (g) at equilibrium to get the answer.

Therefore, at equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.

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Answer:

Normal boiling point is a standard boiling point at sea level highet that is 100 c°

but the temperature at which water boils may vary with different factors like increasing pressure in pressure cooker.

And it decreases with increase in height.

Explanation:

The boiling point of a liquid is the temperature at which its vapor pressure is equal to the pressure of the gas above it. The normal boiling point of a liquid is the temperature at which its vapor pressure is equal to one atmosphere (760 torr).

Normal boiling point is a standard unit  and the highest is 100 c°  at sea level but the temperature at which water boils and the temperature may vary with respect to different factors.  

The boiling point is defined as the temperature at which the liquid vapor pressure is equal to the external pressure surrounding the liquid.

The boiling point of a liquid depend on atmospheric pressure.

When external pressure is reduced, the boiling point will be lowered. For example at sea level the boiling point of water is 100 C  but when we go to 6,600 feet the boiling point become 93.4 C

The standard boiling point is defines  as the temperature of boiling under 1 bar of pressure.

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When a chocolate bar is solid, it is able to smell it.  It is also important to note that a substance 's molecules cannot be in two distinct phases at the a time.

In general, it is not possible for a the molecules of the chocolate  to be in two distinct phases at the same time.

It must be noted that smelling a solid, such as a chocolate bar, however, mean  the release  of loose molecules from the solid,   which may then move   through the air and   reach our olfactory receptors in our nose, allowing us to sense the fragrance.

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Answer:

a) 0.099 L

b) 9.9

Explanation:

Now, given the equation for the decomposition of H2O2;

2H2O2(l) ------> 2H2O(l) + O2(g)

Mass of H2O2;

percent w/v concentration = mass/volume * 100

volume = 10.0-mL

percent w/v concentration = 3.0 percent

mass of  H2O2 = x

3 = x/ 10 * 100

30 = 100x

x = 30/100

x = 0.3 g of H2O2

Number of moles in  0.3 g of H2O2 = mass/ molar mass

Molar mass of H2O2 = 34.0147 g/mol

Number of moles in  0.3 g of H2O2 = 0.3g/34.0147 g/mol

= 0.0088 moles

From the reaction equation;

2 moles of H2O2 yields 1 mole of oxygen

0.0088 moles of H2O2 = 0.0088 * 1/2  = 0.0044 moles of oxygen

If 1 mole of oxygen occupies 22.4 L

0.0044 moles of oxygen occupies 0.0044 *  22.4/1

= 0.099 L

b) initial volume of the H2O2 solution = 10 * 10-3 L

Hence, ratio of the volume of O2 collected to the initial volume of the H2O2 solution = 0.099 L/10 * 10-3 L = 9.9

The number of moles of CO2 produced is 0.021 moles

If the estimated volume of the balloon is wrong then the amount of glucose reacted must be more than is stated.

The respiration equation represents the chemical process of aerobic cellular respiration, which occurs in the mitochondria of cells and is the primary way in which cells generate energy in the form of ATP (adenosine triphosphate).

The equation of the reaction is;

C6H12O6 + 6O2 → 6CO2 + 6H2O + ATP

We know that;

Number of moles of glucose = 10 g/180 g/mol

= 0.056 moles

PV = nRT

n = PV/RT

n = 1 * 0.55/318 * 0.082

n = 0.021

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The Rf value for the blue component is approximately 0.333, and the Rf value for the red component is 0.2.

The Rf value, or the retention factor, is a ratio used in chromatography to quantify the migration distance of a component relative to the migration distance of the solvent front. It is calculated using the formula:

Rf = (distance moved by the component) / (distance moved by the solvent front)

Given the information provided:

Distance moved by the blue component = 5 cm

Distance moved by the red component = 3 cm

Distance moved by the solvent front = 15 cm

Now we can calculate the Rf values for the blue and red components:

Rf_blue = (distance moved by the blue component) / (distance moved by the solvent front)

        = 5 cm / 15 cm

        = 1/3

        ≈ 0.333

Rf_red = (distance moved by the red component) / (distance moved by the solvent front)

       = 3 cm / 15 cm

       = 1/5

       = 0.2

Therefore, the Rf value for the blue component is approximately 0.333, and the Rf value for the red component is 0.2.

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Answer: c????????

Explanation:

Answer:

Shells=2

Element=Oxygen

Nonmetals

Explanation:

Answer:

I would say A.

Explanation:

Answer:

the answer would be 9,448.8

The mass of 9.3 × 10¹⁶ lead atoms is equal to 0.032 mg.

Avogadro’s number represents the number of entities in one mole of any substance. Generally, these units can be molecules, atoms, ions, electrons, or protons, depending upon the type of chemical reaction or reactant and product.

The value of Avogadro’s constant is approximately equal to 6.022 × 10²³ mol⁻¹.

Given, the number of atoms of the lead =  9.3 × 10¹⁶

The atomic mass of the lead = 207.2 g/mol

So 6.022 × 10²³ atoms of lead have mass = 207.2g

Then 9.3 × 10¹⁶ lead atoms will have mass \(=\frac{207.2\times 9.3\times 10^{23}}{ 6.022\times 10^{23}}\)  = 31.998 ×10⁻⁷g

As we know, 1 gram = 1000 mg

The mass of the  9.3 × 10¹⁶ lead atoms =  31.998 ×10⁻⁴ mg = 0.0032 mg

Therefore, the mass of 9.3 × 10¹⁶ lead atoms is  0.032 mg.

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Answer:

Hence, there are approximately $1.686\times {{10}^{22}}$ molecules in 2.3 grams of $N{{H}_{4}}S{{O}_{2}}$.

Answer: Melting Point : 42 to 43 °C

Boiling Point : 215 to 216 °C

Answer:

a balanced force since the object isn't moving

hope this helped

The total kilojoules in two tablespoons is  836.8 kJ.

To determine the total kilojoules in two tablespoons of a substance, we need to know the specific substance and its energy content per tablespoon. Different substances have different energy values, so without this information, it is not possible to provide an accurate calculation.

The energy content of food or substances is typically measured in kilocalories (kcal) or kilojoules (kJ). 1 kilocalorie is equal to 4.184 kilojoules. The energy content of a substance is often listed on food labels or in nutritional databases.

For example, if we have the energy content of a substance as 100 kilocalories (kcal) per tablespoon, we can convert it to kilojoules by multiplying it by 4.184:

100 kcal * 4.184 kJ/kcal = 418.4 kJ

So, if we have two tablespoons of this substance, the total energy would be:

418.4 kJ/tablespoon * 2 tablespoons = 836.8 kJ

It's important to note that the energy content of a substance can vary depending on its composition, density, and other factors. Therefore, it is always recommended to refer to reliable sources such as food labels, nutritional databases, or consult a qualified professional to obtain accurate information regarding the energy content of specific substances.

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Answer:

due to warm temperature

Explanation:

Explanation:

There is water present in liquid form instead of liquid nitrogen on the outer side of the can because of the temperature present in the surrounding environment. The temperature around the can is little warm which is favourable for the water but not for the liquid nitrogen. The liquid nitrogen present in liquid state when the temperature of the surrounding is too cold. if it is warm, the liquid nitrogen starts boiling and converts into gaseous state so that's why the warmer temperature is responsible for the presence of water not the liquid nitrogen.

Answer:

Gases are more difficult to measure than liquids, because measured volumes are highly affected by temperature and pressure. Gas meters measure a defined volume, regardless of the pressurized quantity or quality of the gas flowing through the meter.

Explanation:

It is difficult to measure the volume of agas because measured volumes are highly affected by temperature and pressure.