Which formula represents a tetrahedral molecule?
LiBr
CO2
H₂
SIF4

Answer:

I believe it's 3rd and 4th.

Explanation:

Hope this helps!

The resulting pH after the 15 ml of the 0.1 M HNO₃ solution is added to 200.0 ml of the buffer of 0.25 M HF and 0.25 M NaF is 4.09. The correct option is c.

The chemical equation is as :

HNO₃ + HF → HF₂⁻ + NO₃⁻

The moles of  HNO₃ is:

Moles of  HNO₃ = 0.1 mol/L × 0.015 L

Moles of  HNO₃ = 0.0015 mol

The initial moles of the HF in buffer :

The moles of the HF = 0.25 mol/L × 0.2 L

The moles of the HF = 0.05 mol

The moles HF remaining = 0.05 mol - 0.0015 mol

                                          = 0.0485 mol

[HF] = 0.0485 mol / 0.2 L

[HF] = 0.2425 M

[F⁻] = 0.0015 mol / 0.2 L

[F⁻] = 0.0075 M

The expression for the Henderson-Hasselbalch equation is as :

pH = pKa + log([A-]/[HA])

pH = 3.17 + log(0.0075/0.2425)

pH  = 4.09

The correct option is c.

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119 grams of solid magnesium chloride are required to make 250ml of 0.50M solution.

First, we know that a 1 M solution contains

moles of solute per 1.0 L of solution.

This means that a 5.0 M magnesium chloride solution contains 5.0 moles of magnesium chloride (solute) per 1.0 L of solution.

Now all we need to calculate is that the moles of magnesium chloride in solution of 250ml . Hence, the moles of magnesium chloride in 250 ml = 0.250 L of solution is equivalent to 0.50 mol in 1.0 L of solution i.e.,

mol of MgCl₂ / 0.25L = 0.50mol/ 1.0 L

using cross multiplication we get,

moles of MgCl₂ in 250ml solution is 1.24

Now, we can use the number of moles formula to find out the mass of magnesium chloride in solution.

To convert this to grams, number of moles of magnesium chloride = ratio of mass of magnesium chloride to the molar mass of magnesium chloride.

molar mass of magnesium chloride= 95.2 g then mass of magnesium chloride in 250ml solution

= 1.25 × 95.2 = 119g

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There are approximately 1.56 × 10²³ formula units of Mg₃N₂ in 26.2 grams.

To determine the number of formula units in 26.2 grams of magnesium nitride (Mg₃N₂) using scientific notation, we need to use the molar mass of Mg₃N₂. The molar mass of Mg₃N₂is calculated by adding the atomic masses of three magnesium atoms and two nitrogen atoms.

The atomic mass of magnesium (Mg) is approximately 24.31 grams/mole, and the atomic mass of nitrogen (N) is approximately 14.01 grams/mole.

Therefore, the molar mass of Mg₃N₂is:
(3 * 24.31) + (2 * 14.01)

= 72.93 + 28.02

= 100.95 grams/mole.

Now we can calculate the number of moles of Mg₃N₂in 26.2 grams using the formula: moles = mass / molar mass.

moles = 26.2 grams / 100.95 grams/mole

= 0.259 moles.

Since 1 mole of Mg₃N₂contains Avogadro's number (6.022 × 10²³) formula units, we can multiply the number of moles by Avogadro's number to find the number of formula units:

0.259 moles * 6.022 × 10²³ formula units/mole = 1.56 × 10²³ formula units.

Therefore, there are approximately 1.56 × 10²³ formula units of Mg₃N₂in 26.2 grams.

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Answer:

Hydrogen

Explanation:

It is pretty much present everywhere :)

The key differences between the Articles of Confederation and the U.S Constitution is the article of confederation is sovereignty in states and the constitution  is expand the governments authority.

The document created the better system of government for the new nation is the US constitution.

The Article of confederation , the state have stronger power than the central power and in the US constitution , the power of central government is stronger than the states. The important development was the establishment of three departments. There are three departments of government that is legislative , executive and judicial.

Thus, The key differences between the Articles of Confederation and the U.S. Constitution is the article of confederation is sovereignty in states and the constitution  is expand the governments authority.

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In the titration of a weak monoprotic acid with a strong base, the pH of the titration solution halfway to the endpoint will be:

C. greater than the pKa of the weak acid.

During the titration of a weak acid with a strong base, the pH of the solution changes as the titrant is added. At the halfway point to the endpoint, the moles of strong base added are approximately equal to half the moles needed to reach the equivalence point.

Since the weak acid is partially neutralized, the concentration of its conjugate base increases, making the solution more basic. As a result, the pH at the midpoint of the titration will be greater than the pKa of the weak acid.

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Kinetic energy is an energy present in the object with motion. When the water freezes then the speed of the molecules decreases. Thus, option A is accurate.

Kinetic energy is possessed by an object when it is in moving motion and because of the molecules. When the temperature decreases the movement of the molecule decreases.

The decrease in the kinetic energy results in a gain of potential energy and release of heat in the surrounding. The temperature and the kinetic energy are directly proportional and affect the speed of the molecules.

Therefore, the freezing of water results in decreased speed of the water molecule.

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There are 1000 millimeters in a meter. To convert 161 millimeters to meters, we need to divide by 1000:

161 millimeters ÷ 1000 = 0.161 meters

Therefore, 161 millimeters is equal to 0.161 meters.

According to Charle's law, the volume of the given mass of a gas is directly proportional to its absolute temperature provided that the pressure is constant. Mathemically;

where;

V1 and V2 are the initial and final volume of the gas

T1 and T2 are the initial and final temperatures of the gas (in Kelvin)

Given the following parameters:

Substitute the given parameters into the formula;

Therefore the volume of the gas at 20°C is approximately 97.67cm³

Answer:

It's B.

Explanation:

Answer: C

Explanation:

Answer:

Synthetic clothes can easily build up static electricity. It also easily can catch up on fire and when it does, it melts and can fuse to your skin.

Explanation:

Answer:

Explanation:

Synthetic fibres like Polyester catches fire very easily and melts. After melting It sticks to the body of the person wearing it causing severe burns. Hence it is advised not wear synthetic clothes while working in the Kitchen. Its advised to wear Apron or cotton clothes while cooking in Kitchen.

Answer:

The cathode reaction is NiO2+H2O+2e−→Ni(OH)2+2OH−.

Answer:

net force

Explanation:

The net force acting on an object is the combination of all of the individual forces acting on it. ... If two forces act on an object in the same direction, the net force is the sum of the two forces.

The reaction for the formation of HI, at the given time, has a reaction quotient of 613.

What is the reaction quotient?

Reaction quotient is the ratio of the concentration of product and reactant raised to the stoichiometric power at a given time interval.

The chemical reaction for the formation of HI is given as:

\(\rm H_2\;+\;I_2\;\rightarrow\;2\;HI\)

The reaction quotient is given as:

\(\rm Q=\dfrac{[HI]^2}{[H_2]\;[I_2]}\)

The concentration of system at the time, t has been:

Hydrogen = 0.1 M

Iodine = 0.2 M

HI = 3.5 M

Substituting the values for reaction quotient:

\(\rm Q=\dfrac{(3.5)^2}{(0.1)(0.2)}\\ Q=613\)

The reaction quotient for the reaction is 613. Thus, option D is correct.

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Answer:

Humdity would decrease hence temprature would do the same, hence tundra are called deserts at times.

Explanation:

If you keep on decreasing the temperature without changing the air's moisture content significantly, eventually you'll reach 100 percent relative humidity, and then water vapor will start to condense to form dew.

Dew Point. When the relative humidity reaches 100 percent, dew forms. Dew point refers to the temperature at which air reaches saturation by water molecules. Warmer air can hold more water molecules, and as that warm air cools, it loses water vapor in the form of condensation.

When relative humidity reaches 100 percent or is saturated, moisture will condense, meaning the water vapor changes to liquid-vapor. Thus, the saturation level of air is related to the air's temperature.

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Answer:

reactants contain more energy in the decomposition reaction of sodium azide?

Explanation:

The statement "the octet rule states that atoms will gain, lose, or share electrons in order to have 18 in their valence shell" is false.

This statement contains an error in the number of electrons required for the octet rule.The octet rule states that atoms will gain, lose, or share electrons in order to have 8 electrons in their valence shell. The valence shell is the outermost shell of an atom that contains electrons, and it is the shell involved in chemical bonding. For most atoms, the octet rule means having eight electrons in the valence shell, which corresponds to a stable, noble gas configuration.

Learning about the octet rule is important because it helps predict the types of chemical bonds that can form between atoms. Atoms will interact with one another in order to achieve the electron configuration of a noble gas. The formation of chemical bonds can lead to the creation of new substances with unique properties.

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This is not the best way to organize a periodic table because two elements might have similar atomic mass.

Periodic table is a chart in which arrangement of chemical elements are done.

In the early periodic table elements are arranged on the basis of their atomic masses, while after sometime Moseley arranged the periodic table on the basis of atomic number as he proposed that properties of an element is justified on the basis of number if electrons.

And mass of two substances may be same so it is difficult to differentiate between them.

Hence, two elements might have similar atomic mass.

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Answer:

86.56 g/mol is the average atomic mass of the element X

Explanation:

The average atomic mass of an element is defined as the sum of the masses of each isotope times its percentage. For the element X the average atomic mass is:

85.91×67.25% + 87.91×32.75%

85.91×0.6725 + 87.91×32.75

Answer:

400 cm³

Explanation:

n = number of moles (mol)

c = concentration (mol/dm³)

v = volume (dm³)

Relevant formula:

n = c × v

Note: remember to convert to appropriate units

20 cm³ = 0.02 dm³

n = 2 × 0.02

n = 0.04

This means there is 0.04 moles of the solute, i.e. the substance being diluted;

Since we also know the final concentration, we can work out the volume using the same formula:

0.04 = 0.1 × v

v = 0.04/0.1

v = 0.4 dm³ = 400 cm³

Answer:

0.25moles

Explanation:

There are 1000\(cm^{3}\) for 1\(dm^{3}\)

Therefore in 1000\(cm^{3}\) of 0.5 mol/\(dm^{3}\) solution has = 0.5 moles

Therefore 500\(cm^{3}\) contains = 0.5/1000 x 500 = 0.25moles

The number of moles of sulfuric acid in 0.5 mol/dm³ solution is equal to 0.25 mol.

The concentration of the solution can be determined as the number of moles of a solute in per unit volume of a solution is known as molarity or molar concentration.

The Molarity of the solution is calculated in the following formula:

Molarity (M) = Moles (n)/Volume of the Solution (in L)

Now if we have to find the number of moles of solute in the solution, the formula becomes:

Number of moles of solute (n) = Molarity (M) × Volume of the Solution

Given, the concentration of the sulfuric acid solution = 0.5 mol/dm³

The volume of the solution, V = 500 cm³

As we know, 1 dm³ = 10³ cm³, the volume of solution = 0.5 dm³

The number of moles of the sulfuric acid = M × V

= 0.5 × 0.5 = 0.25 mol

Therefore, 0.25 moles of sulfuric acid in 500cm3 of a 0.5mol/dm³ solution of sulfuric acid.

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Answer: Explanation:

Gallium has three electrons in the outer energy level and therefore has three valence electrons. The identification of valence electrons is vital because the chemical behavior of an element is determined primarily by the arrangement of the electrons in the valence shell.

The correct answer is (b) more than the total of the durations for all the individual activities.

In project management, the duration of the project refers to the total time it takes to complete the entire project, from start to finish. This duration is typically longer than the sum of the durations for all the individual activities within the project. There are various factors that contribute to the project duration being longer than the sum of individual activity durations. These factors include dependencies between activities, resource constraints, and other project-specific considerations. Activities may need to be sequenced in a specific order.

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Answer: C. 1000 Newton

Explanation:

Given that :

Weight of moon rover on earth = 6000 newton

Approximate of moon rover on moon will be?

Weight of an object (W) = mass(m) × acceleration due to gravity(g)

To get the mass of moon rover(m) :

m = weight / acceleration due to gravity

g on earth = 9.8m/s²

Hence,

mass of moon rover = 6000/ 9.8

= 612.244kg

Surface gravity on the moon is about 1.6m/s²

Hence ;

Weight of moon rover on the moon :

Mass of moon rover × 1.6m/s²

= 612.244 × 1.6m/s²

= 979.59 Newton

= 1000 Newton (nearest thousand)

The approximate weight of the Moon Rover on the Moon is 1000 N

The correct answer to the question is Option C. 1000 N

We'll begin by calculating the mass of the Moon Rover. This can be obtained as follow:

Weight (W) = 6000 N

Acceleration due to gravity (g) = 9.8 m/s²

W = m × g

6000 = m × 9.8

m = 6000 / 9.8

Acceleration due to gravity of the moon (g) = 1.67 m/s²

Mass (m) = 612.24 Kg

W = m × g

W = 612.24 × 1.67

Therefore, the approximate weight of the Moon Rover on the Moon is 1000 N

The correct answer to the question is Option C. 1000 N

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The correct option is $26785.To calculate the total cost per equivalent unit using the weighted average method, we need to consider the costs incurred in both the beginning work in process and the units added during the period.

First, let's calculate the equivalent units of production for both conversion and materials:

Conversion costs:

Beginning work in process: 400 units × 20% complete = 80 equivalent units

Units added during the period: 2,000 units × 40% complete = 800 equivalent units

Total equivalent units for conversion = 80 + 800 = 880 equivalent units

Material costs:

Beginning work in process: 400 units × 30% complete = 120 equivalent units

Units added during the period: 2,000 units × 50% complete = 1,000 equivalent units

Total equivalent units for materials = 120 + 1,000 = 1,120 equivalent units

Next, let's calculate the total costs incurred:

Conversion costs:

Beginning work in process cost: $14,880

Costs added during the period: $409,200

Total conversion costs = $14,880 + $409,200 = $424,080

Material costs:

Beginning work in process cost: $9,900

Costs added during the period: $180,080

Total material costs = $9,900 + $180,080 = $189,980

Now, we can calculate the total cost per equivalent unit:

Total cost per equivalent unit = (Total conversion costs + Total material costs) / (Total equivalent units for conversion + Total equivalent units for materials)

Total cost per equivalent unit = ($424,080 + $189,980) / (880 + 1,120)

Total cost per equivalent unit ≈ $267.85

Therefore, the correct option is $26785.

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Answer:

A

Explanation:

because the glass contain the ice cubes