8. Which conditions in the atmosphere would cause smoke from a campfire on a beach to blow toward the ocean?

A dodecahedron must have 12 faces

Of these 12 faces, two must be the top & base.

So there shall be 10 faces on the lateral surface.

Hence there shall be 5 on one half & 5 on the other half.

To have 5 faces on the base of a regular polygon, the base must have 5 sides.

So it must be a regular pentagon.

The faces of a regular dodecahedron are regular pentagons.

Option C) is the right answer.

An image is attached for your reference.

Explanation:

If more ammonia is added to the reaction at equilibrium, the equilibrium will shift to the right.

The principle states that reactions at equilibrium will always adjust to neutralize any effect due to constraints.

Thus, ammonia being a reactant in the reaction will make the equilibrium shift to the right because the reaction will adjust to annul the effects of increasing the concentration of ammonia in the reaction.

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Empirical formula mass

Molar mass=232.2g/mol

Find n

Molecular formula

Find the empirical formula mass

Find n

Round to nearest whole

Molecular formula

Answer:

Ideal Solution: An ideal solution is a solution where interactions between molecules are identical between all the molecules in the solution. Non ideal Solution: A non ideal solution is a solution that has differences in the interactions between molecules of different components in the solution.

Explanation:

Answer:

Ideal solutions obey Raoult's law over entire range of concentrations. Nonideal solutions do not obey Raoult's law over the entire range of concentrations. 2. The vapour pressure of ideal solution always lies between vapour pressures of pure components.

Answer: Chemistry is the study of matter and the changes it undergoes.

An example of chemistry being used in the real world is how an ECG works. Chemistry is also sometimes considered the "central science". I hope this answer helped!! :)

An unsaturated solution is formed when 25g of NaCI are dissolved in 100g of water at 30 degrees Celsius.

A solution is formed as a result of the dissolution of a solute in a solvent.

However, based on the capacity of the solvent to take in more solute, a solution can be of three types namely;

An unsaturated solution is a solution whose solvent can dissolve more solute at a particular temperature.

According to this question, 25g of NaCI are dissolved in 100g of water at 30°C, hence, the solvent can take in more solute at 30°C.

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Answer:

Balanced forces are forces that act in opposite directions and cancel each other out

let me know if you have any other questions

Answer:

Explanation:

See below~

[tex] [OH^{-}] = 0.001 \\ = 10^{-3} M \Longrightarrow pOH = 3 \\ pH + pOH = 14 \Longrightarrow pH = 14-3 = 11[/tex]

The pH of a 0.0010 M NaOH solution is approximately 11.

To calculate the pH of a solution, you need to determine the concentration of hydrogen ions ([H+]). In the case of a strong base like NaOH, the concentration of hydroxide ions ([OH-]) can be used to calculate the concentration of hydrogen ions.

Given that NaOH is a strong base, it dissociates completely in water to form Na+ and OH- ions. The concentration of hydroxide ions can be assumed to be the same as the concentration of NaOH.

In this case, the concentration of NaOH is given as 0.0010 M.

Since [OH-] = 0.0010 M, we can use the Kw (ionization constant of water) to calculate [H+].

Kw = [H+][OH-] = 1.0 x [tex]10^{-14}[/tex]

[H+] = Kw / [OH-]

[H+] = (1.0 x [tex]10^{-14}[/tex]) / (0.0010)

[H+] = 1.0 x [tex]10^{-11}[/tex]M

To calculate the pH, we use the formula: pH = -log[H+]

pH = -log(1.0 x [tex]10^{-11}[/tex])

pH ≈ 11

Therefore, the pH of a 0.0010 M NaOH solution is approximately 11.

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A combustion reaction is a reaction that reacts in the presence of oxygen molecules. Methane will release -3115 kJ/mol of heat.

A combustion reaction includes the reaction between the chemical reactant and oxygen molecule to produce the product. The combustion reaction between methane and oxygen is given as:

CH₄(g) + 2O₂ (g) → CO₂(g) + 2H₂O (l), ΔH = -890 kJ/mol

The stoichiometry coefficient from the reaction gives 1 mole of methane releases -890 kJ/mol enthalpy.

So, 3.5 moles methane will release = 3.5 × -890 = -3115 kJ/mol

Therefore, -3115 kJ/mol of heat is released.

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Grams per liter in the solution give the density of the solution. The density of the solution is 27.4 g/L. Thus, option d is correct.

Density is the ratio of the mass in gms to the volume of the solution in liters.

Given,

Mass of  potassium chloride = 8.210 gms

Volume of solution = 0.300 L

Density is calculated as:

ρ = mass ÷ volume

= 8.210 ÷ 0.300

= 27.36 g/L

Therefore, the density of the solution is 27.4 g/L.

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Answer:

5.40

Explanation:

you set up the equation with the given value first which is 97.3grams, and grams also goes on the bottom of the equation since the grams have to cancel out to make a mol. calculate the grams of H20 which is 18.016, then put it on the bottom of the equation, then put 1 mol on top.

97.3g x 1mol/18.016

Answer:

5.4 moles

Explanation:

H2 O    mole weight     1.008 * 2   + 16 = 18.016 gm/mole

97.3 gm / 18.016 gm/mole   = 5.4 moles

Answer:

A. The sun's rays strike the water more directly near the equator.

Explanation:

I pass the test

Answer:

A. Clear and Sunny

Explanation:

The answer would be A. Clear and Sunny. A high pressure system occurs where the air mass above the Earth is denser than in surrounding areas, and therefore exerts a higher force or pressure. They usually happen with li9ght winds. Using process of elimination, it could not be D. Warm and Stormy, C. Cloudy and Rainy, or B. Cold and Stormy because all have wet climates.

that science I'm not good really at that

Answer:

Sodium has one valence electron. Valence electrons are electrons found in the outermost shell of an atom. The shell number representing the valence shell will differ depending on the atom in question. For sodium, which is in the 3rd row of the periodic table, the valence electrons will be found in the 3rd shell.

The last statement is correct

They both have seven protons in the nucleus.

it's wrong because they have six protons in the nuclear

They both have the same mass number.

it's wrong because Carbon-12 has mass number 12 but Carbon-13 has mass number 13

They both have seven neutrons in the nucleus.

it's wrong because Carbon-12 has six  in the nucleus but Carbon-13 has seven  in the nucleus

They both have the same atomic number.

It's true. They have the atomic number - 6

Answer:

D. They both have the same atomic number.

Explanation:

ed22

Answer:

5.74 gm

Explanation:

First, use the ideal gas law   PV = n RT

  to find the number of moles, then multiply by 28 g/ mole

PV = n RT    T must be in Kelvin    R = 8.314463 L kPa/(K - Mol)

                         ( make sure you use the R with the correct units!!)

182 kPa * 3 L  =  n (8.314463 ) ( 273.15+47.2)

 solve for n = .205 moles

.205 mole * 28 g/mole = 5.74 gm  

The mass of the gas can be calculated using ideal gas law. The mass of the gas is approximately 1.37 g.

According to ideal gas law, the pressure , volume temperature and number of a moles of a gas is related as :

PV = nRT

To calculate the mass of a gas that would fit into a container at a given temperature, pressure, and volume, we can use the ideal gas law equation:

PV = nRT

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

We can rearrange this equation to solve for the number of moles:

n = PV/RT

Once we know the number of moles, we can use the molar mass of the gas to calculate the mass of the gas:

mass = n x molar mass

where molar mass is given as 28.0 g/mol.

Substituting the given values, we get:

n = (182 kPa) x (3.00 L) / [(8.31 J/mol-K) x (47.2°C + 273.15)] = 0.0489 moles

mass = 0.0489 moles x 28.0 g/mol = 1.37 g

Therefore, the mass of the gas that would fit into a 3.00 L container at 182 kPa and 47.2°C is approximately 1.37 g.

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Answer:

The sun is important to Earth because it helps regulate the climate, is the main source of energy for producers in the ecosystems and it keeps the oceans from freezing, along with providing light. If just one of these factors changed dramatically, it would impact all life on Earth. Without the sun, the planet’s oceans would freeze, temperatures would drop and all life would die off without light or food.

The sun is important to every single aspect of life on the planet. Human life could not exist without it because it would cause all of the water and food sources to cease to exist. The sun is in no danger of disappearing any time soon. Scientists estimate the sun has at least another 5 billion years before it turns into a red giant and swallows up Mercury and Venus. It will also destroy all life on Earth because it will be close to the planet once that change occurs. The temperature of the sun will also increase tenfold from 18 million to 180 million degrees Fahrenheit. The increase in the sun’s size when it finally begins to change will be due to the heat increase causing expansion.

Without the sun, we would no energy to live, no plants to eat, no trees to give us oxygen or animals to roam. We would not have gravity to keep the earth in orbit. Without the sun, the earth would be dark and cold and life would quickly disappear.

The molar mass of the protein from the calculation is 1667 g/mol.

The osmotic pressure can be determined using the formula;

π=icRT

i = Van't Hoff factor = 1

c = concentration = ?

R = gas constant = 0.082 atmLK-1mol-1

T = temperature = 298 K

π= 2.24 torr or 0.029 atm

Now;

0.029 = 1 * c * 0.082 * 298

c = 0.029/1 * 0.082 * 298

c = 0.0012 M

Now;

2.00×10-3 g/MM = 0.0012 M *  1.00/1000L

MM = 2.00×10-3 g/0.0012 M *  1.00/1000L

MM = 1667 g/mol

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A negative enthalpy (ΔH)for a molecule means energy was released when the molecule went through a phase change.

The enthalpy change of a reaction is the amount of heat absorbed or released as the reaction takes place.

Also, the amount of energy required to change the phase of a material is known as the enthalpy,

A negative enthalpy entails the amount of energy released during an exothermic reaction.

Thus, a negative enthalpy (ΔH)for a molecule means energy was released when the molecule went through a phase change.

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Answer:

0.264moles

Explanation:

number of moles= given mass/molar mass.

Molar mass of Cu2SO4= 63.5+32+4(16)=159.5

moles(n)=42.2/159.5= 0.264moles

Answer:

0.82 moles CO₂

Explanation:

To convert from grams to moles, you need to find the molar mass of CO₂. This conversion is a ratio stating the amount of grams CO₂ per 1 mole. The molar mass is calculated using the molar mass of each element (in CO₂) from the periodic table.

Molar Mass (Carbon): 12.011 g/mol

Molar Mass (Oxygen): 15.998 g/mol

Molar Mass (CO₂): 12.011 g/mol + 2(15.998 g/mol)

Molar Mass (CO₂): 44.007 g/mol

36 grams CO₂               1 mole
----------------------  x  --------------------------  = 0.82 moles CO₂
                                 44.007 grams

Explanation:

92 protons 92 electrons and 146 neutrons

Answer:

92 protons, 92 electrons, 146 neutrons

Explanation:

U-238 has 92 protons, 92 electrons, 146 neutrons.

The 238 is mass number talking about protons + neutrons. Uranium will always have 92 protons so the rest of the things are neutrons (146). Electrons will always equal protons if the element is neutral (no charge) and since no charge was given the numbers will match

To determine the name of an anion, you take the name of its element and replace the end with "ide".

An anion in chemistry is a negatively charged ion.

Anions are usually formed when a non-metallic atom gains electron(s).

An anion is usually named by taking the elemental name, removing the ending, and adding “ide.

Examples of anions are as follows:

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Answer:

1940K and 1939K Isotopes are two forms of the same element that have different numbers of neutrons in the nucleus. This means same symbol, and same atomic number (subscript), but different mass number (superscript).

see the attached file!!

[tex]\huge\tt{SOLUTION:}[/tex]

━┈─────────────────────┈━

→(-23.0)-(0.0_

→-23.0 degrees C

→ -23=1.86 * Cm

→ 12.37= Cm.

→i* molality

→i= 1

→12.37= 1*m

→12.37= m

12.37m= moles C2H6O2/ 10.0kg water

123.7= moles of C2H6O2

123.7moles C2H6O2 * 62.26g C2H6O2

━┈─────────────────────┈━

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“Work smarter not harder”

The final volume of the nitrogen sample would be 790 mL

According to Charles, at constant pressure, the volume of a gas is directly proportional to its temperature.

Mathematically: v1/t1 = v2/t2, where v1 and v2 = initial and final volume, and t1 and t2 = initial and final temperature.

In this case, t1 = 37 °C or 310 K, t2 =  77 °C or 350 K, v1 = 700 mL

Thus: v2 = v1 x t2/t1 = 700 x 350/310 = 790 mL

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Answer:

0.805 or 0.781 depending on the method used.

Explanation:

Data provided

half life ie t1/2= 8days.

No= 50g

t=48days

Nt=?

Method 1

Formula: Nt= No(1/2)^n

where n= number of half lives.

= t/t1/2 = 48/8

=6.

thus Nt= 50(1/2)^6= 0.781

Method 2

Formula: Nt= Noe^-(lambda)t

where lambda= decay constant

= ln2/ t1/2= ln2/ 8 = 0.086.

thus Nt= 50e^-(0.086×48)= 0.805.

Answer:

b

Explanation:

this is because all organisims need water, c is out of the question because no energy is needed, d is out because it is needed for fighting against predators