Why is air resistance important?

299.7g of H2O will be produced.

1st) With the balanced chemical equation and the molar mass of CH4 and H2O, we can calculate the amount of H2O that is produced by stoichiometry:

- CH4 molar mass: 16g/mol

- H2O molar mass: 18g/mol

According to the balanced equation, 16g of CH4 will produce 36g of H2O (2 x 18g).

2nd) Now, with a mathematical rule of three we can calculate the grams of water that will be produced from 133.2 grams of CH4:

Finally, 299.7g of H2O will be produced from 133.2 grams of CH4.

The original concentration of HNO3 is 0.11 M.

The equivalence point is the point in the titration process where the amount of reactant in one solution is chemically equivalent to the amount of reactant in the other solution.

In acid-base titrations, the equivalence point is the point at which the acid and the base are neutralized and the pH is equal to 7.0 (neutral).The given question is related to titration.

To find the original concentration of HNO3, we need to know the volume of NaOH solution added to the acid in the titration process and the molarity of NaOH solution.

Using these data, we can calculate the moles of NaOH used in the titration. Since the reaction between HNO3 and NaOH is a 1:1 ratio, we can find the moles of HNO3 present in the original solution.

From this, we can calculate the original concentration of HNO3.Let’s assume that the molarity of NaOH solution is x M and the volume of NaOH solution added is 22.0 ml.

According to the balanced chemical equation of the reaction between HNO3 and NaOH,1 mole of HNO3 + 1 mole of NaOH → 1 mole of NaNO3 + 1 mole of H2O

Moles of NaOH used in titration = (22.0 ml) (x M) = 22x/1000 moles

Moles of HNO3 present in original solution = moles of NaOH used in titration = 22x/1000 moles

Assuming the initial volume of HNO3 is 25.0 ml, the moles of HNO3 present in the original solution would be calculated as follows:

Molarity (M) = moles/volume (L)Initial moles of HNO3 = M × V = (22x/1000) moles

Moles of HNO3 present in the original solution = (22x/1000) moles - (1/2) × (22x/1000) moles = 11x/1000 moles

Initial volume of HNO3 = moles/M = (11x/1000) moles / (25/1000) L = (11/25) L = 0.44 L = 440 ml

Therefore, the original concentration of HNO3 is 0.11 M.

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The final temperature of the 100 g sample of aluminum is 15.3°C after it absorbs 1379 J of heat at an initial temperature of 0.00°C and the specific heat capacity of aluminum is 0.903 J/g °C.

The specific heat capacity of aluminum is 0.903 J/g °C. As given in the question, 0.00°C is the initial temperature of 100 g sample of aluminum and it absorbs 1379 J of heat. We need to find out the final temperature of the sample of aluminum.

Here's how we can calculate it:

Given,Mass of aluminum, m = 100 g

Heat absorbed by the aluminum, Q = 1379 J

Temperature of aluminum, t1 = 0.00°C (initial temperature)

Specific heat capacity of aluminum, c = 0.903 J/g °C

Temperature of aluminum, t2 = ?Q = mc(t2 - t1)1379 = 100 × 0.903 × (t2 - 0.00)

On solving this equation, we get: t2 = 15.3°

, the final temperature of the 100 g sample of aluminum is 15.3°C.

: The final temperature of the 100 g sample of aluminum is 15.3°C after it absorbs 1379 J of heat at an initial temperature of 0.00°C and the specific heat capacity of aluminum is 0.903 J/g °C.

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To calculate the final temperature of a 100.0 g sample of aluminum that absorbs 1379 J of heat at 0.00 °C, we can use the specific heat capacity of aluminum to determine the amount of heat energy required to raise the temperature of the sample by one degree Celsius.

The specific heat capacity of aluminum is 0.90 J/g°C. This means that it takes 0.90 J of energy to raise the temperature of one gram of aluminum by one degree Celsius.
To calculate the amount of energy required to raise the temperature of the 100.0 g sample by one degree Celsius, we can use the following formula:
Energy = mass x specific heat capacity x change in temperature
Where:
Energy = 1379 J (the amount of energy absorbed by the aluminum)
Mass = 100.0 g
Specific heat capacity = 0.90 J/g°C
Change in temperature = final temperature - initial temperature
We can rearrange this formula to solve for the final temperature:
Final temperature = (energy / (mass x specific heat capacity)) + initial temperature
Substituting the values we know:
Final temperature = (1379 J / (100.0 g x 0.90 J/g°C)) + 0.00 °C
Final temperature = 15.32 °C
Therefore, the final temperature of the aluminum sample is 15.32 °C.

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Answer:

Hi

Explanation:

Decomposition reactions are really the opposite of combination reactions. In decomposition reactions, a single compound breaks down into two or more simpler substances (elements and/or compounds).

Explanation:

Decomposition chemical reactions

Decomposition reactions are really the opposite of combination reactions. In decomposition reactions, a single compound breaks down into two or more simpler substances (elements and/or compounds).

The decomposition of water into hydrogen and oxygen gases

and the decomposition of hydrogen peroxide t form oxygen gas and water

are examples of decomposition reactions.

Answer:

Fold the filter paper in fourths before placing it in the funnel and pour all the liquid through the funnel.

Answer:

1

Explanation:

The redox reaction that occurs during the operation of a battery is best describes as non-spontaneous and occurring in a chemical (voltaic) cell.

Redox reactions are those reactions in which oxidation or reduction reaction occurs. In these reactions, losing of an electron occur.

An example is formation of hydrogen fluoride.

Thus, the correct option is (1) non-spontaneous and occurring in a chemical (voltaic) cell.

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Answer:

cells arose from preexisting cells

Explanation:

Rudolph Virchow is a German biologist that built on the work of other scientists such as Theodor Schwan to contribute his own quota to the development of the cell theory as it is currently known.

After several studies, Virchow rejected the idea of spontaneous generation and accepted the initially rejected idea of cell division. He earlier believed that cell division only takes place is some special type of cells and not in all cells.

Even though Virchow was not the first to bring the idea of cells arising from preexisting cells, he was the one that popularized the idea and added it to the earlier belief that all living organisms are made up of cells.

Answer:

B

Explanation:

70.9-gram sample of \(Cl_{2}\) gas will occupy Opton C. 22.4 liters at STP.

To determine the volume occupied by the sample of \(Cl_{2}\) (g) at STP, we can use the ideal gas law equation, PV = nRT

where P = pressure

V = volume

n = number of moles

R = ideal gas constant

T = temperature.

At STP (Standard Temperature and Pressure), the pressure is 1 atmosphere (atm) and the temperature is 273.15 Kelvin (K).

First, calculate the number of moles of \(Cl_{2}\) (g) using its molar mass. The molar mass  \(Cl_{2}\) is 70.9 grams/mol.

Number of moles (n) = mass (m) / molar mass (M)

n = 70.9 g / 70.9 g/mol

n = 1 mol

Now, we can calculate the volume using the ideal gas law:

V = (nRT) / P

V = (1 mol * 0.0821 L·atm/mol·K * 273.15 K) / 1 atm

V ≈ 22.4 L

Therefore, the correct answer is C. 22.4 L.

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Explanation:

1.180g

2.saturated solution

3.25

4.6

5.367

The false statement among the three given options is option c. According to Le Chatelier's principle, when the concentration of a product is increased, the equilibrium of the reaction shifts to the left to balance the increased concentration.

This is because the reaction tries to reduce the excess concentration of the product by forming more reactants. Therefore, option c stating that the reaction shifts left to reestablish equilibrium when the product concentration is increased is false. Instead, the reaction shifts to the right when the reactant concentration is increased, and it shifts to the left when the product concentration is increased. Options a and b are correct statements based on Le Chatelier's principle. Increasing the temperature of an endothermic reaction provides energy to the reactants, which causes the reaction to shift towards the products to absorb the extra energy. Similarly, when a solid is added to a solution, the solution becomes saturated when no more solid can dissolve, and there is undissolved solid present at the bottom. Therefore, option c is the false statement, and the correct statement is that the reaction shifts right when the reactant concentration is increased and shifts left when the product concentration is increased.

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Answer:

4.34 times 10^24

Explanation:

number of atoms=7.2 times Avogadro's number

                           =7.2 times 6.02 times 10^23

                           =4.34 times 10^24

Answer:

Explanation: we will multiple the amount of moles to the Avogadro's number for example:                                                                                                        

                                     7.2*6*10 to the power 23

Rank the crystal lattice structures in order of decreasing efficiency of space in the structure.

1. Simple cubic

2. Body centered cubic

3. Face centered cubic

4. Hexegonal close packed

Answer:

75240J

Explanation:

Given parameters:

Mass of water  = 300g

Initial temperature of the water  = 85°C

Final temperature  = 25°C

Unknown:

Amount of heat released = ?

Solution:

The amount of heat released in this cooling process can be calculated using the expression below;

     H  = m x c x (t₂  - t₁)

m is the mass

c is the specific heat capacity of water  = 4.18J/g°C

t is the temperature

  Insert the parameters and solve;

 H = 300 x 4.18 x (25  - 85) = -75240J

The negative symbol denotes heat loss.

Answer:

NO OF NEUTRON =MASS NO -ATOMIC NO

=39-19

=20

bcz atomic no is equal to no of electrons

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Answer:

5.9 × 10² kJ

Explanation:

When carbon disulfide, CS₂, forms from its elements, heat is absorbed. The corresponding value for the standard enthalpy of formation of carbon disulfide is 117.36 kJ/mol. The thermochemical equation that represents this process is:

C(graphite) + 2 S(s, rhombic) ⇒ CS₂(g)   ΔH°f = 117.36 kJ/mol

117.36 kJ of heat are absorbed when 1 mole of CS₂ is formed. The amount of heat absorbed when 5.0 moles of CS₂ are formed is:

5.0 mol × 117.36 kJ/mol = 5.9 × 10² kJ

Answer:

See note in Explanation

Explanation:

The modern periodic table of the elements is arranged in order of increasing atomic numbers which is also in terms of the number of protons in the nucleus. That is, for any element listed on the periodic table its atomic number equals the number of protons in the nucleus. Thus, the element with 2 protons in its nucleus would be element #2 (Helium), element #3 (Lithium) has 3 protons in its nucleus and element #4 (Beryllium) has an atomic number 4 and contains 4 protons in its nucleus.

Also, this arrangement of elements finds that elements below elements 2, 3 & 4, Neon #10; sodium #11 & magnesium #12 have similar chemical and physical properties as does elements #2, #3 & #4. Such gives rise to the 'Periodic Law' => the chemical and physical properties of the elements is a periodic function of their atomic number (or, number of protons in the nucleus).

Answer:

Because it is made up of different minerals which are chemically combined.

Explanation:

The element is most likely to react with Br is Li(Lithium). Alkali metals have very low density, which makes them very reactive, because they want to gain energy and become stable.

Lithium is an alkali metal which belongs to group 1 . Bromine (Br) reacts with many metals, sometimes very vigorously. For instance, with potassium, it reacts explosively. Bromine even combines with relatively unreactive metals, such as platinum and palladium. The elements toward the bottom left corner of the periodic table are the metals that are the most active in the sense of being the most reactive. Lithium, sodium, and potassium all react with water, for example.

Out of the given elements the correct choice is Li.

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Answer:

204,375 mL.

Explanation:

327 mL - 3.2 M

x mL - 2 M

x= (2 M x 327 mL) /3.2 M

x= 204,375 mL.

Answer:

7 to 5

Explanation:

power of 500 to 5

The limiting reactant will be Fe.

They are reactants that are available in limited quantities, as compared to other reactants, during the course of reactions.

From the equation of the reaction: \(4Fe + 3O_2 --- > 2Fe_2O_3\)

The mole ratio of Fe to O2 is 4:3.

Thus, for 0.25 mol Fe, 0.25 x 3/4 = 0.1875 mol of O2 is required.

With 0.5 mol of O2 available, it means oxygen is in excess while Fe is limited in availability.

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The limiting reactant from the calculations is Fe.

The limiting reactant is the reactant that is present in the least amount in solution. Now we have the equation as; 4Fe+ 3O2 → 2Fe2O3

If 4 moles of Fe reacts with 3 moles of O2

0.25 mol of Fe  reacts with  0.25 mol *  3 moles/4 moles

= 0.1875 moles of O2

It then follows that the limiting reactant is Fe.

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Answer:

jsjdhiefjcbjajrjrjwbxjuq ueei1udj

221 grams is the mass of oxygen gas is consumed in a reaction that produces 4.60 mol sulfur dioxide

The given question is incomplete as it lacks a chemical reaction, however, the chemical reaction is :

Hydrogen sulfide gas burns in oxygen to produce sulfur dioxide and water vapor.

\(2H_2S(g)+3O_2(g)\rightarrow 2SO_2(g)+2H_2O(g)\)

Explanation:

Given:

The chemical reaction:

\(2H_2S(g)+3O_2(g)\rightarrow 2SO_2(g)+2H_2O(g)\)

To find:

Mass of oxygen gas consumed in a reaction to produce 4.60 moles of sulfur dioxide gas.

Solution:

The moles of sulfur dioxide gas produced =4.60 mol

\(2H_2S(g)+3O_2(g)\rightarrow 2SO_2(g)+2H_2O(g)\)

According to a chemical reaction, 2 moles sulfur dioxide is obtained from 3 moles of oxygen gas, then 4.60 moles of sulfur dioxide will be obtained from:

\(=\frac{3}{2}\times 4.60mol=6.9\text{ mol of }O_2\)

Mass of 6.9 moles of oxygen gas:

\(6.9 mol\times 31.998 g/mol=220.79 g\approx 221 g\)

221 grams is the mass of oxygen gas is consumed in a reaction that produces 4.60 mol sulfur dioxide.

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Explanation:

—COOH and —NH₂

Carboxylic Acid and Amino

To calculate the actual heat, I'd use calorimetric to weigh a sample mass. I 'd calculate the mass of a material sample. At a specified temperature, I will heat the material. I should position the heated material inside a calorimeter for coffee cup containing an initially established mass of water. I 'd wait for the weather to stabilize and then measure the difference in weather. To assess the sum of energy consumed, I will use the increase in water temperatures. For measure real heat I will use the sum of energy per material, weight, and temperature shift.

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With all care,

07x12!

Answer:

-I would use calorimetry to determine the specific heat.

-I would measure the mass of a sample of the substance.

-I would heat the substance to a known temperature.

-I would place the heated substance into a coffee-cup calorimeter containing a known mass of water with a known initial temperature.

-I would wait for the temperature to equilibrate, then calculate temperature change.

-I would use the temperature change of water to determine the amount of energy absorbed.

-I would use the amount of energy lost by substance, mass, and temperature change to calculate specific heat.

Hormones secreted into the hypophyseal portal system are delivered directly to the adenohypophysis. The correct option is B.

The adenohypophysis, also known as the anterior pituitary gland, is a glandular tissue that secretes various hormones that regulate important physiological processes such as growth, reproduction, and metabolism. The hypophyseal portal system is a specialized network of blood vessels that connects the hypothalamus to the adenohypophysis, allowing the hypothalamus to regulate the secretion of hormones by the adenohypophysis.

When the hypothalamus releases a hormone into the hypophyseal portal system, it travels directly to the adenohypophysis where it stimulates or inhibits the release of a specific hormone. For example, the hypothalamus secretes gonadotropin-releasing hormone (GnRH) into the hypophyseal portal system, which stimulates the adenohypophysis to secrete luteinizing hormone (LH) and follicle-stimulating hormone (FSH), which are essential for reproductive function.

In summary, the hypophyseal portal system plays a crucial role in regulating the secretion of hormones by the adenohypophysis. Hormones secreted into the hypophyseal portal system are delivered directly to the adenohypophysis, where they stimulate or inhibit the release of specific hormones that regulate various physiological processes in the body.

Thus, the correct option is B.

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Answer:

Land fill

Explanation:

A landfill is a carefully managed waste disposal site. It is the oldest method of waste disposal. In a dumpsite, biodegradable materials decay overtime.

However, non-biodegradable materials such as plastics and other polymers tend to last many years in landfills. This category of wastes pose a great threat to the environment.

Exothermic reactions, release exceeding chemical energy from the reactants. Before its release, the energy is turned into another form, heat or light. C) The total chemical potential energy of the reactants is greater than the total chemical potential energy of the products.

An exothermic reaction is the chemical reaction that releases energy as heat or light when the reactants turn into products.

Reactant molecules have more energy than the product molecules, and hence, the remaining energy must leave the system. So part of the chemical energy from the reactants is released as another type of energy  (heat or light).

Usually, oxidation reactions are exothermic.

The correct option is C) The total chemical potential energy of the reactants is greater than the total chemical potential energy of the products.

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Answer:

exposure to the sun (heat and light) for long period of time and air (oxygen reacts with particles)