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b. The critical path refers to the longest sequence of activities from the start to the end of a project, considering the duration of each activity.

c. The total duration for the critical path activities is 18 days, which represents the expected project completion time.

The critical path is a term used in project management to refer to the sequence of activities that determines the minimum time required to complete a project. It is the longest path from the start to the end of the project, considering the duration of each activity. The critical path helps identify the activities that must be closely monitored and managed to ensure the project is completed on time.

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In the case of magnesium, calcium, aluminum, and potassium, potassium is the most reactive metal.

In general, reactivity of a metal increases as you move down a group or a column in the periodic table. The reactivity of a metal is related to the ease with which it loses electrons to form a positive ion, or cation. In the case of magnesium, calcium, aluminum, and potassium, potassium is the most reactive metal. It is located in the first group or column of the periodic table, and has the smallest atomic radius and the most loosely held outermost electrons. This makes it easier for potassium to lose electrons and form a positive ion, making it the most reactive of the four metals mentioned. Aluminum is the next most reactive, followed by calcium and magnesium. Magnesium is the least reactive of the four metals mentioned.

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Answer :                                                                                                                      

   The element X which ha a smaller atomic radius than strontium , a larger ionization energy  than phosphorous , and a smaller elctronegativity than chlorine is Nitrogen

Explanation:

 Here are some properties of Nitrogen-

Hence , the X element is NITROGEN.

That the calculated molar mass of the gas is closest to the molar mass of N2O. Therefore, the gas is most likely N2O.

What is Density?

Density is a physical property of matter that describes how much mass is contained in a given volume. It is defined as the amount of mass per unit volume, and is typically expressed in units of grams per cubic centimeter (g/cm3) or kilograms per cubic meter (kg/m3).

The gas density and the conditions provided can be used to calculate the molar mass of the gas using the ideal gas law:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.

Rearranging this equation to solve for n/V, we get:

n/V = P/RT

M = m/n

where M is the molar mass, m is the mass of the gas, and n is the number of moles.

Since the density is given in grams per liter, we can assume that 1 liter of the gas has a mass of 1.96 grams. Therefore, the number of moles of the gas in 1 liter can be calculated as:

n/V = P/RT = (1 atm)/(0.08206 L·atm/mol·K × 273 K) = 0.0446 mol/L

The number of grams of the gas in 1 liter can be calculated as:

m = density × volume = 1.96 g/L × 1 L = 1.96 g

Therefore, the molar mass of the gas is:

M = m/n = 1.96 g / 0.0446 mol = 43.9 g/mol

Comparing this molar mass to the molar masses of the possible nitrogen oxides:

NO has a molar mass of 30.01 g/mol

N2O4 has a molar mass of 92.01 g/mol

N2O has a molar mass of 44.01 g/mol

We can see that the calculated molar mass of the gas is closest to the molar mass of N2O. Therefore, the gas is most likely N2O.

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Answer:

3,048 minutes

Explanation:

762 divided by 5

that number times 20

The time required for a physics teacher to jog continuously and REALLY wanted to get there will be 50 hours and 48 minutes.

The distance covered by the particle or the body in an hour is called speed. It is a scalar quantity. It is the ratio of distance to time.

We know that the speed formula

Speed = Distance/Time

It is 762 miles from here to Chicago. An obese physics teacher jogs at a rate of 5.0 miles every 20.0 minutes.

Then the speed of the physics teacher will be

Speed = 5 / (20 / 60)

Speed = 15 miles per hour

The time required for a physics teacher to jog continuously and REALLY wanted to get there will be

15 = 762 / T

T = 762 / 15

T = 50.8 hours

T = 50 hours and 48 minutes

The time required for a physics teacher to jog continuously and REALLY wanted to get there will be 50 hours and 48 minutes.

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2 moles of ammonia and 2.5 moles of oxygen gas will produce 2 moles of nitric oxide and 3 moles of water.

The reaction between ammonia (NH3) and oxygen gas (O2) to produce nitric oxide (NO) and water (H2O) is shown below:4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g)The balanced equation shows that 4 moles of ammonia react with 5 moles of oxygen gas to produce 4 moles of nitric oxide and 6 moles of water. To determine the amount of products formed when a certain amount of reactants is used, we need to use stoichiometry.Suppose we react 2 moles of ammonia with 2.5 moles of oxygen gas. From the balanced equation, we can see that the ratio of moles of ammonia to moles of oxygen gas is 4:5. Therefore, ammonia is the limiting reagent because only 2 moles of ammonia are available, which is not enough to react with 2.5 moles of oxygen gas.To determine the amount of products formed, we will use the mole ratio from the balanced equation:4 moles NH3 : 5 moles O2 : 4 moles NO : 6 moles H2O2 moles NH3 is equivalent to (5/4) × 2 moles O2 = 2.5 moles O2So, 2 moles NH3 + 2.5 moles O2 → 2 moles NO + 3 moles H2O.The number of significant digits in the answer will depend on the number of significant digits in the given amounts of reactants.

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The correct answer is:

c. Reduction occurs at the cathode and is where cations move towards.

In a galvanic cell, also known as a voltaic cell, a spontaneous redox (reduction-oxidation) reaction occurs, generating electrical energy. The cell consists of two half-cells: the anode and the cathode.

The anode is where oxidation occurs, and it is the site where electrons are produced. Oxidation involves the loss of electrons, so the anode releases electrons into the circuit. This process creates an excess of cations (positively charged ions) in the anode compartment.

The cathode is where reduction occurs. Reduction involves the gain of electrons. Electrons flow from the anode through the external circuit to the cathode, where they are consumed in a reduction reaction. This results in a reduction of cations at the cathode and the formation of a neutral species or anions (negatively charged ions).

To summarize, the correct statement is that reduction occurs at the cathode and is where cations move towards. It is important to note that the movement of ions in a galvanic cell is driven by the flow of electrons through the external circuit, from the anode to the cathode.

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Answer:

19) 3.6920 × 10⁻⁵

20) 4.059× 10²

21) 2.46810121416 × 10³

22)  1.0000× 10⁻³

Explanation:

Scientific notation is the way to express the large value in short form.

The number in scientific notation have two parts.

The digits (decimal point will place after first digit)

× 10 ( the power which put the decimal point where it should be)

For example:

0.000036920

In scientific notation =  3.6920 × 10⁻⁵

405.9

In scientific notation  = 4.059× 10²

2468.10121416

In scientific notation  = 2.46810121416 × 10³

0.0010000

In scientific notation  = 1.0000× 10⁻³

42.2°C increase in temperature will result if 212.0 g of copper absorbs 4.08kJ of heat energy.

To solve this problem, we can use the formula:
where q is the heat energy absorbed by the copper, m is the mass of the copper, c is the specific heat of copper, and ΔT is the change in temperature.

High specific heat materials need a lot of heat to increase their temperature by one degree. Contrarily, substances with lower specific heat need very little heat to raise their temperature by one degree.
We are given the values of m = 212.0 g, q = 4.08 kJ (which we need to convert to J), and c = 0.385 J/g°C. So, first let's convert the units of q:
4.08 kJ = 4080 J
Now we can plug in the values and solve for ΔT:
4080 J = (212.0 g)(0.385 J/g°C)(ΔT)
ΔT = 4080 J / (212.0 g × 0.385 J/g°C)
ΔT = 42.2°C
Therefore, the increase in temperature of the copper will be 42.2°C if it absorbs 4.08 kJ of heat energy.

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Molten cryolite is the substance which serves as an electrolyte in the diagram.

This is defined as a substance that conducts electricity when dissolved in water.

Molten cryolite serves as the electrolyte as it helps dissolve molten aluminium oxide and increases the conductivity of the solution which was why it was chosen as the most appropriate choice.

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Answer: Molten cryolite

Explanation: Molten cryolite serves as the electrolyte as it helps dissolve molten aluminium oxide and increases the conductivity of the solution which was why it was chosen as the most appropriate choice.

Answer:

Its food for cannibals.

Answer:

increase the rate of reaction

The rise in thermal energy is the right response (A). Entropy is a metric for a system's disorder or randomness.

Entropy is a metric used to assess how chaotic or random a system is. It is a state function in thermodynamics that specifies how energy is distributed and how much of it is available to perform meaningful work. As entropy tends to rise with time, the amount of energy available for work decreases. The overall entropy of a closed system cannot decrease, according to the second rule of thermodynamics, which means that energy tends to disperse and become more disordered. Many scientific fields, such as chemistry, physics, and biology, as well as numerous practical applications, such as energy conversion, information theory, and materials science, depend on an understanding of entropy.

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Answer:

single or double covalent bonds

Explanation:

A magnet that is positively charged on one end and negatively charged on the other end is an example of D. polarity

Polarity is a property possessed by molecules in which there is a separation of electrical charges within the same molecule. On one side it will have a positive property and on the other side it will have a negative property. This property is what gives the possibility of being able to have other properties such as solubility, melting point or intermolecular forces.

This is because the poles between the different molecules are going to attract each other, the positive poles with the negative ones and the negative poles with the positive ones. So a good example of polarity is a magnet that is positively charged on one side and negatively on the other.

Therefore, we can confirm that a magnet that is positively charged on one end and negatively charged on the other end is an example of D. polarity.

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Answer:

Structur formulas are good for depicting polymers because they explain the properties and structure of the compound which empirical and molecular formulas cannot always represent.

Structural formulas describe the bonds shared by the elemental atom. They are good for depicting polymers as they describe the structure and the properties.

Polymers are said to be substances that are either natural or synthetic and are macromolecules made of various chains of monomers joined together.

The actual structure and arrangement of the atoms in the polymers are depicted by the structural formula. These were not explainable by the empirical, or molecular formulas.

The atoms involved and the linkage between them are described through the structures and allow us to know the certain properties of the monomers involved. It gives the idea of the chemical and physical properties.

Therefore, the structural formulas depict the polymer.

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Answer:

plutonic rocks are formed when magma cools and solidifies underground This shows us if the rock is plutonic or volcanic. When magma cools underground, it cools super slow and when lava cools above ground, it cools faster. When magma and lava cool, mineral crystals start to form in the molten rock.

Explanation:

i hope this is correct

Answer:

this is the answer to your question bro or sis

Answer:

Solution given:

2 Al + 3 H2SO4 – Al2(SO4)3 + 3H2

2mole +3mole. --- 1 mole + 3 mole

27×2g. +3×98g-------- 342,g. + 6g

we have

2 mole of Al gives. 6g of h2

5 moles of Al gives 6/2×5=15g of hydrogen

15 g is your answer

Answer:

When water changes to a solid or gas, it's said that water changes to a different state of matter

Explanation:

Even when water physical form changes, the molecules stay the same. Water's molecules contains two hydrogen atoms that is bonded with one oxygen atom.

For a typical person who leads a sedentary lifestyle, a typical maximum oxygen intake level would be B. 35 ml/kg/min.

A sedentary lifestyle is a lifestyle type characterized by abundant sedentary behaviors. People who live a sedentary life often sit or lie down for most of the day in activities such as socializing, watching TV, playing video games, reading books, and using mobile phones and computers.

A sedentary lifestyle can lead to high blood pressure, low cholesterol, and elevated blood sugar levels, which damage the walls of blood vessels and increase the risk of a heart attack.

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Answer:

Molar mass and Mass

Explanation:

The relationship between mass and number of moles is given as;

Number of moles = Mass / Molar mass

Mass = 1.6 g

Molar mass of HCl = ( 1 + 35.5 ) = 36.5 g/mol

Number of moles = 1.6 g / 36.5 g/mol

Number of moles = 0.0438 mol

Answer: Matter changes when electrons are gained or lost.

Explanation:

The charge on an atom  changes when electrons are gained or lost during chemical changes.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether it is  solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged  particles and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral  species and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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Answer:

the branch of science that deals with the identification of the substances of which matter is composed. the investigation of their properties and the ways in which they interact, combine, and change; and the use of these processes to form new substances.the science that deals with the properties, composition, and structure of substances (defined as elements and compounds), the transformations they undergo, and the energy that is released or absorbed during these processes.the science that deals with the properties, composition, and structure of substances (defined as elements and compounds), the transformations they undergo, and the energy that is released or absorbed during these processes.

Explanation:

Liver contains digestive enzymes to break down harmful substances.

Digestive enzymes: Digestive enzymes are a group of enzymes which break down polymeric macromolecules into their smaller building blocks, in order to facilitate their absorption into the cells of the body.

Digestive enzymes are found in the digestive tracts of animals (including humans) as well as in the tracts of carnivorous plants, where they aid in the digestion of food, as well as inside the cells, especially in their lysosomes, where they function to maintain the cellular survival.

Liver: The liver contains various digestive enzymes, such as liver alcohol dehydrogenase, which helps to break down toxic substances such as alcohol and drugs, and convert them into less harmful substances that can be excreted from the body.

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Answer:

atomic nucleus :)

Explanation:

The change in entropy and the change in enthalpy must be known in order to assess the spontaneity of a chemical reaction or physical process at a particular set of conditions.

To assess the spontaneity of a chemical reaction or physical process at specific conditions, it is necessary to consider both the change in entropy and the change in enthalpy. These two factors provide crucial information about the thermodynamic properties of the system.

The change in entropy (∆S) represents the measure of the system's disorder or randomness. If ∆S is positive, it indicates an increase in disorder, while a negative ∆S suggests a decrease in disorder. The change in enthalpy (∆H) represents the heat transfer during a reaction or process. A positive ∆H indicates an endothermic process, while a negative ∆H suggests an exothermic process.

To determine the spontaneity of a reaction or process, one can use the Gibbs free energy (∆G) equation: ∆G = ∆H - T∆S, where T is the temperature. If ∆G is negative, the reaction or process is spontaneous under the given conditions.

Therefore, to assess the spontaneity of a chemical reaction or physical process, it is essential to know both the change in entropy and the change in enthalpy.

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In the solution water is solute and ethanol is solvent.

Binary solution

A mixture of two liquids that are completely miscible one with another is known as a Binary solution. The boiling point of binary solution depends upon the composition of the solution.

A binary solution consists of a solute and a solvent.

The solute is usually present in smaller quantity and solvent is in larger quantity.

If a solution has 70 ml ( larger quantity ) of ethanol , it means ethanol is the solvent .

water with 30 ml of quantity ( smaller quantity ) will be the solute.

So , in the mixture, water is the solute.

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