A 1.50 M Mg(NO3)2 solution is prepared. How many moles of NO3 ions are in 250.0 mL of this solution? Suppose 250.0 mL of this 1.50 M Mg(NO3)2 solution were to lose 100.0 mL of water from evaporation, final volume now 150.0 mL.

Molecules with similar bond angles have similar geometries, or shapes, which are determined by the arrangement of atoms and electron pairs around a central atom. However, different molecules with similar bond angles may have different names for their shapes because the specific arrangement of atoms and electron pairs can result in unique geometric features. For example, molecules with four electron pairs around the central atom and a tetrahedral geometry may have different names depending on the type and arrangement of substituent atoms or groups attached to the central atom. Thus, while similar bond angles contribute to similar shapes, the specific arrangement of atoms and electron pairs can result in different names for the shapes of different molecules.

Molecules can have similar bond angles but different names for their shapes because the arrangement of atoms and the overall geometry of the molecule might differ even though the angles between the bonded atoms are the same. Bond angles are determined by the repulsion between electron pairs, while the shape of a molecule is defined by the spatial arrangement of atoms and their bonding. Let's consider two examples:

1. Bent shape - The water (H2O) molecule has a bent shape due to the presence of two lone pairs on the oxygen atom, causing the hydrogen-oxygen-hydrogen bond angle to be approximately 104.5 degrees.

2. Trigonal pyramidal shape - The ammonia (NH3) molecule has a trigonal pyramidal shape because of the presence of one lone pair on the nitrogen atom, which results in a nitrogen-hydrogen-hydrogen bond angle of approximately 107 degrees.

Even though the bond angles are quite similar (104.5 degrees and 107 degrees), the molecules are given different names for their shapes (bent and trigonal pyramidal) because the overall arrangement of atoms and their bonding patterns are not the same.

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The molecular formula of the unknown compound is C2H2O2.

To determine the molecular formula of the unknown compound, we need to calculate the empirical formula first and then find the multiple of its subscripts to obtain the molecular formula.

Given:

Percentage of carbon = 40.0%

Percentage of hydrogen = 6.7%

Percentage of oxygen = 53.3%

Molecular mass = 60.0 g/mol

Step 1: Convert the percentages to grams.

Assuming we have 100 grams of the compound:

Mass of carbon = 40.0 g

Mass of hydrogen = 6.7 g

Mass of oxygen = 53.3 g

Step 2: Convert the masses to moles using the molar masses of the elements.

Molar mass of carbon = 12.01 g/mol

Molar mass of hydrogen = 1.008 g/mol

Molar mass of oxygen = 16.00 g/mol

Number of moles of carbon = Mass of carbon / Molar mass of carbon

= 40.0 g / 12.01 g/mol

= 3.332 mol

Number of moles of hydrogen = Mass of hydrogen / Molar mass of hydrogen

= 6.7 g / 1.008 g/mol

= 6.648 mol

Number of moles of oxygen = Mass of oxygen / Molar mass of oxygen

= 53.3 g / 16.00 g/mol

= 3.331 mol

Step 3: Determine the empirical formula by dividing the moles by the smallest value.

Dividing the moles of carbon, hydrogen, and oxygen by 3.331 gives approximately 1 for each element.

So, the empirical formula of the compound is CHO.

Step 4: Determine the multiple of the subscripts to obtain the molecular formula.

To find the multiple, we divide the molecular mass by the empirical formula mass.

Molecular mass = 60.0 g/mol

Empirical formula mass = (12.01 g/mol) + (1.008 g/mol) + (16.00 g/mol) = 29.018 g/mol

Multiple = Molecular mass / Empirical formula mass

= 60.0 g/mol / 29.018 g/mol

= 2.07

Rounding to the nearest whole number, we get 2.

Therefore, the molecular formula of the unknown compound is C2H2O2.

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Answer:

15900

Explanation:

I think hope this helps!! :D

Answer:

15900

Explanation:

Answer:

Birds and marine mammals are generally considered to be more vulnerable to oil spills because they are more likely to come into direct contact with the oil, either through exposure to the oil on the surface of the water or through ingestion of oil-contaminated prey. Birds may become coated in oil when they land on the water's surface to feed or rest, and marine mammals may be exposed to oil through inhalation or ingestion of contaminated water or prey.

Explanation:

Answer:

Speed

Explanation:

Motion can be represented by a distance-time graph, which plots distance on the y-axis and time on the x-axis. The slope of a distance-time graph represents speed. The steeper the slope is, the faster the speed.

Hope this helps!:)

First, let's write the balanced chemical reaction:

2 H2O2 ---MnO2--> 2 H2O + O2

This reaction is a b. Decomposition Reaction of hydrogen peroxide.

Step 1. Let's transform 2.11 mg of H2O2 into moles using the following equation mole = mass / molar mass

Step 2. We are going to use the equation proportion to calculate the quantity in moles of each compound.

Step 3. We are going to transform moles into grams of each compound using the following equation: mass = mole x molar mass

Step 1.

We need to transform 2.11 mg to g. We just need to divide by 1000,

So: 2.11 x 10^-3 g of H2O

mole = 2.11 x 10^-3/34.02

mole = 6.20 x 10^-5 moles

Step 2.

2 moles of H2O2 ---- 2 moles of H2O

6.20 x 10^-5 moles ---- x moles of H2O

x = 6.20 x 10^-5 moles of H2O

2 moles of H2O2 ---- 1 moles of O2

6.20 x 10^-5 moles ---- x moles of O2

x = 3.10 x 10^-5 moles of O2

Step 3.

molar mass of O2 : 32 g/mol

molar mass of H2O: 18 g/mol

mass of H2O = 6.20 x 10^-5 x 18 = 1.12 x 10^-3 g

mass of O2 = 3.10 x 10^-5 x 32 = 9.92 x 10^-4 g

Answer:

1.3155M

Explanation:

molar mass of CuSO4

=63.55+32.07+16(4)

=159.62g/mol

n=mass/molar mass

n=42.00/159.62

n=0.2631mol

volume=200mL=0.2L

molarity=mole (n)/volume (v)

molarity=0.2631mol/0.2L

molarity=1.3155M

Answer:

D.) H-O

Explanation:

Polarity is determined based on the difference in electronegativity of the atoms. The greater the difference, the more polar the bond. The general trend is that the atoms in the top-right corner of the periodic table are the most electronegative.

A.) is incorrect because H-H has no electronegativity difference, making it nonpolar.

B.) and C.) are incorrect because their electronegativity differences are not the greatest.

D.) is correct because the electronegativity difference between the H and O is the greatest.

Answer:

88g

Explanation:

Since the total mass of substances used up in the reaction must be equal to the amount of product formed, according to the conservation of mass law, there must be 64 g + 24 g = 88 g of carbon dioxide present after the reaction.

You need 83.3 mL of 12.0 M solution of HCl to create 1.0 L of a 0.1 M solution.

To solve this problem, we can use the dilution equation:

M1V1 = M2V2

Where M1 is the initial concentration, V1 is the initial volume, M2 is the final concentration, and V2 is the final volume.

In this case, we want to find the volume of the 12.0M HCl solution needed to create 1.0L of a 0.1M solution. So we can plug in the values we know:

M1 = 12.0M

V1 = ?

M2 = 0.1M

V2 = 1.0L

Solving for V1, we get:

V1 = (M2 x V2)/M1

V1 = (0.1M x 1.0L)/12.0M

V1 = 0.00833 L or 8.33 mL

Therefore, we need 8.33 mL of the 12.0M HCl solution to create 1.0L of a 0.1M solution.

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In the winter in the northern hemisphere, the concentration of carbon dioxide in the atmosphere increases because this area has mostly ocean and less plants.

After water vapor, carbon dioxide is one of the most abundant greenhouse gas in the Earth's atmosphere. A greenhouse gas is a gas that traps heat from the Sun and then radiates it back toward the planet's surface, rather than the heat being reflected back into space.

The majority of the Earth's landmass, and hence plant life, is located in the Northern Hemisphere. So, during summer in the Northern Hemisphere, when plants are more active and uptake more carbon dioxide for photosynthesis, atmospheric carbon dioxide levels generally  drop. On the other hand, during the Northern Hemisphere's winter, atmospheric carbon dioxide levels rise because the decomposing plant matter in the Northern Hemisphere releases carbon dioxide, and there is not enough photosynthesizing plant life in the Southern Hemisphere (which is experiencing summer during the Northern Hemisphere's winter) to counter this effect.

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The pH scale is a logarithmic scale that measures the acidity or alkalinity of a solution based on the concentration of hydrogen ions (H+). Each unit change in pH represents a tenfold difference in the concentration of H+.

To determine the H+ concentration at pH 6.8 compared to pH 7.4, we can calculate the ratio of the two concentrations using the formula:

[H+] at pH 6.8 / [H+] at pH 7.4 = 10^(pH difference) The pH difference is 7.4 - 6.8 = 0.6. Plugging this value into the formula, we have:

[H+] at pH 6.8 / [H+] at pH 7.4 = 10^(0.6) Calculating 10^(0.6) gives us approximately 3.981. Therefore, the H+ concentration at pH 6.8 is approximately 3.981 times greater than at pH 7.4.  None of the given answer choices matches this value exactly. The closest option is C. 4, which represents a fourfold difference, but it is not an exact match.

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Density is defined as the mass divided by volume.

Density is also known by the name of viscosity.

Density is denoted by D.

It's unit is basically denoted by kg/m^3.

The density of the block is 0.42 g/cm^3.

The formula of the density is, Density = mass (m) / volume (v)

Now, it is given in the word problem that,

Mass of pine wood = 27g

Volume = 4^3 = 64 cm^3

Thus, Density = 27 g /64 cm^3 = 0.42 g/cm^3.

Hence, the density of the block of pine would be 0.42 g/cm^3

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Answer:

–2400 N

Explanation:

This is a physics question. However, the answer to the question is given below.

We'll begin by converting 36 Km/hr to m/s. This can be obtained as follow:

3.6 Km/hr = 1 m/s

Therefore,

36 Km/hr = 36 Km/hr × 1 m/s / 3.6 km/hr

36 Km/hr = 10 m/s

Thus, 36 Km/hr is equivalent 10 m/s.

Next, we shall determine the acceleration of the car. This can be obtained as follow:

Initial velocity (u) = 10 m/s

Final velocity (v) = 0 m/s

Time (t) = 5 s

Acceleration (a) =?

a = (v – u) / t

a = (0 – 10) / 5

a = – 10 / 5

a = –2 m/s²

Finally, we shall determine the force required to stop the car. This can be obtained as follow:

Mass (m) = 1200 Kg

Acceleration (a) = –2 m/s²

Force (F) =?

F = ma

F = 1200 × –2

F = –2400 N

NOTE: The negative sign indicate that the force is in opposite direction to the motion of the car.

Based on the data and calculations obtained, it can be concluded that the hypothesis stating, "If the density of the object is 19.32 g/ml, then the object is gold" is not supported.

To support this conclusion, the data and calculations regarding the density of the object should be analyzed. If the calculated density of the object differs significantly from the expected value of 19.32 g/ml, it indicates that the object is not gold.

The accuracy and precision of the data can be assessed by comparing the calculated density with the expected density value. If the calculated density is close to the expected value, it suggests high accuracy. Additionally, if multiple measurements of density yield consistent results, it indicates high precision.

Further experimentation could involve additional tests to determine the identity of the object. These tests could include assessing other physical or chemical properties such as melting point, electrical conductivity, or reactivity with certain substances.

Possible sources of error in the experiment could include instrumental errors in measuring the mass or volume of the object, contamination of the object, or inaccuracies in the known density of gold used for comparison. These factors could contribute to deviations between the calculated and expected densities.

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Answer:

Antoine Laurent Lavoisier (1743 -94), a French chemist was the first to establish an experimentally useful definition of an element. Elements can be normally divided into metals, non metals and metalloids.

Answer:

it is C. take it to the local automotive parts store to be recycled

Explanation:

hope this helped have a nice day!

An electron of mass travelling in a circular orbit with a constant speed of v makes up a hydrogen atom. The orbital radius is 5*10^- 11 meters. The lepton particle family's first generation includes electrons.

In a hydrogen atom, the electron orbits the nucleus in a circle with a radius of 5*10^- 11 metres. It lasts for 1.5*10^16 seconds. The electron motion is accompanied by a current (electromagnetic charge: 1.6*10^19 C).

The electron is a subatomic particle with the symbol e or and an electric charge of one elementarily negative charge of hydrogen atom. Because they are thought to be elementary particles and do not have any known components or substructure, electrons are part of the first generation of the lepton particle family.

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Hello ☺️, given below will be the answers:-

• 1.1 Å = 1.1 x 10^-7 mm

• 5.38 Å = 5.38 × 10^-24 cm³

• 0.234 mg = 0.000234 kg

✍️ By Benjemin ☺️

The medication can treat people who have the disease described. According to the commercial, the drug has FDA approval to treat a condition whose symptoms are listed.

Additionally, the narrator notes that the medication only comes with a prescription and has 1% of the active substance. We can deduce from this information that the drug can effectively treat persons who have the condition generating these symptoms, but obtaining it requires a prescription. The commercial provides no support for the other possibilities.

Therefore, the correct option is D.

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Answer:

single displacement

Explanation:

Answer:

127,236 kj of heat

Explanation:

This is the final answer

According to  the Charle's law as pressure is constant the new volume of gas is 4.907 L.

Charles law is an experimental gas law which provides description about the behavior of gases which tend to expand on heating.It states that, at constant pressure, the temperature is in direct proportion with the volume that is,V∝T or V₁/T₁=V₂/T₂.The relation between volume and temperature is linear as the temperature increases volume also increases.

The graph of volume versus temperature is a straight line passing through the origin.The law was proposed by Jacques Charles , a french physicist in 1780.

In the given problem , on substituting values in above formula, V₂=3.8×278/359=4.907 L.

Thus , the new volume of methane gas is 4.907 L.

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The standard enthalpy change for reaction (3) is 117.1 kJ.

The standard enthalpy change for reaction (3) can be calculated by using the enthalpy changes of reactions (1) and (2) and applying Hess's Law.

To do this, we need to manipulate the given equations so that the desired reaction (3) can be obtained.

First, we reverse reaction (1) to get the formation of C2H4(g) from C2H6(g):

C2H4(g)C2H6(g) ΔH° = -52.3 kJ

Next, we multiply reaction (2) by 2 and reverse it to obtain 2 moles of C2H6(g) reacting to form 3 moles of H2(g):

2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

Now, we add the two modified equations together:

C2H4(g)C2H6(g) ΔH° = -52.3 kJ
2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

When adding these equations, the C2H6(g) on the left side cancels out with the C2H6(g) on the right side, leaving us with the desired reaction (3):

C2H4(g) + H2(g)C2H6(g) ΔH° = -52.3 kJ + 169.4 kJ = 117.1 kJ

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Answer:

The Definition of Differentiation

The derivative is the instantaneous rate of change of a function with respect to one of its variables. This is equivalent to finding the slope of the tangent line to the function at a point

Explanation:

The Cullinan Diamond was found in Transvaal, South Africa, in 1905, and the Transvaal government sent it to Edward VII of England (reigned 1901–1910) as a birthday gift.

It became a worldwide sensation and was bought by the government of the Transvaal Colony. The Cullinan diamond was originally sold for £150,000. The Cullinan diamond has been a part of royal regalia since it was presented to the royal family in 1907.

It was the largest gem-quality rough diamond ever discovered, weighing well over 3,000 carats. When it was found, it was worth more than $21 million in today's dollars.

Therefore, It is the fourth-largest polished diamond in the world, weighing 317.4 carats. The enormous diamond was given Sir Thomas Cullinan's name after the mine's owner after it was unearthed.

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The Cullinan Diamond was found in Transvaal, South Africa, in 1905, and the Transvaal government sent it to Edward VII of England (reigned 1901–1910) as a birthday gift.

It became a worldwide sensation and was bought by the government of the Transvaal Colony. The Cullinan diamond was originally sold for £150,000. The Cullinan diamond has been a part of royal regalia since it was presented to the royal family in 1907.

It was the largest gem-quality rough diamond ever discovered, weighing well over 3,000 carats. When it was found, it was worth more than $21 million in today's dollars.

Therefore, It is the fourth-largest polished diamond in the world, weighing 317.4 carats. The enormous diamond was given Sir Thomas Cullinan's name after the mine's owner after it was unearthed.

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The enthalpy change per kilogram of hydrogen is -120 kJ/ g H2

What is enthalpy of a reaction?

A chemical reaction's change in enthalpy that takes place under a constant pressure is known as the "heat of reaction" or "enthalpy of reaction." It is a helpful thermodynamic unit of measurement for figuring out how much energy per mole is emitted or created during a reaction. Enthalpy is a state function as well because it is created by pressure, volume, and internal energy, all of which are state functions.

The reaction is,

2H2(g)+O2(g) = 2H2O(g) H=-484 kJ

The molar weight of hydrogen, which is represented in the equation as H2, is 2.02 g/mol. According to the equation, 2 mol of H2 produce 484 kJ of heat. The heat evolved per gram of hydrogen is calculated by dividing this by the 2 mol H2 and the 2.02 g/mol H2:

(-484 kJ/2 mol H2)(1 mol H2/2.92 g H2) = -120. kJ/g H2

Hence, the enthalpy change per kilogram of hydrogen is -120 kJ/ g H2

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Answer:

medium

Explanation:

Answer:

The difference in potential energy between the reactants and products

Explanation:

The difference in potential energy between the reactants and products reveals the enthalpy of reaction, hence option B is correct.

The change in the enthalpy of a chemical reaction that takes place at constant pressure is known as the heat of reaction also known as the enthalpy of reaction. It is a unit of measurement for thermodynamics.

In a thermodynamic system, energy is measured by enthalpy. Enthalpy is a measure of a system's overall heat content and is equal to the system's internal energy plus the sum of its volume and pressure.

The difference between  total product and total reactant molar enthalpies, computed for substances in their standard states, is the standard enthalpy of reaction for a chemical reaction.

Therefore, the difference in potential energy between the reactants and products reveals the enthalpy of reaction, hence option B is correct.

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The amount of heat required to convert 1 g of any substance from the liquid to the gaseous state is defined as heat of vaporization.

Heat is the form of power this is transferred between systems or items with exceptional temperatures (flowing from the excessive-temperature device to the low-temperature system). also known as heat power or thermal strength. warmness is normally measured in Btu, calories, or joules.

In only phrases, the temperature is how heat or bloodless an object is, at the same time as warmth is the electricity that flows from a hotter object to a cooler one. for instance, the temperature of a cup of espresso may also feel hot in case you put your hand around it. it is warm due to the fact warmth from the coffee is transferred to the cup.

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