Which of the following statements describes a problem associated with
chemicals made by chemists?
O
A. They are in medicines,
O
B. They can be released into the environment,
C. They can be found in food,
O
O
D. They can be in cleaning products.

Answer:

The volume is 214, 3 ml

Explanation:

We calculate the weight of 1 mol of  NH4OH:

Weight  1 mol NH4OH=  Weight N + (Weight H) * 5 + Weight 0

Weight  1 mol NH4OH= 14g + 1 g* 5 + 16g = 35 g/mol

1 mol NH4OH-----35 g

0,6mol NH4OH----X=(0,6mol NH4OHx 35 g)/1 mol NH4OH= 21 g

We have 0,6 mol in 1000ml of solution (0,600 M)

21g NH4OH-----------1000ml

4,50 g NH4OH------x= (4,50 g NH4OH  x 1000ml)/21 g NH4OH= 214, 2857143 ml

Answer: B. Pressure, temperature, and volume

Explanation:

I took the test

hope this helped

The three physical properties of gases are pressure, temperature and volume and the correct option is option B.

Gasses do not possess any definite volume or shape. They totally fill all the space accessible to them. The characteristic or properties of gases to fill the available volume within a container is the result of the freedom that gas particles have to move everywhere in the accessible space.

Gases are physical properties of mark sensitivity of volume change with the change of temperature and pressure.

Thus the gases are generally concerned with the relations among four properties, namely mass, pressure, volume, and temperature.

Therefore, The three physical properties of gases are pressure, temperature and volume and the correct option is option B.

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Answer:

yes

Explanation:

Hydroelectric energy is a renewable energy source that uses the potential energy of water to generate electricity. It's a significant contributor to renewable energy consumption but does come with environmental concerns that need to be addressed.

Yes, hydroelectric energy is considered a renewable energy source. Hydroelectric power plants use the potential energy stored in water held in dams or flowing in rivers to generate electricity. When water is released from the dam, it flows through turbines, converting potential energy into kinetic energy, which is then used to generate electricity.

This process is renewable because it relies on the water cycle, which is a natural and continuous process on Earth. Water evaporates, forms clouds, and then falls as precipitation, continually replenishing the water in rivers and reservoirs. Hydroelectric power does not produce direct pollutants, making it a clean energy source.

While hydroelectric power is a significant portion of renewable energy consumption, accounting for about 35% of the United States' renewable energy, it is not without environmental concerns. Dams can disrupt local ecosystems and obstruct the migratory paths of fish. However, with proper management and environmental considerations, such as fish ladders, these impacts can be mitigated, allowing hydroelectric power to remain a valuable part of our renewable energy portfolio.

The car would need approximately 7.73 gallons of gasoline for a 3.0-hour trip at a speed of 70 mi/h, and fuel efficiency of 11km/L.

To calculate how many gallons of gas are needed for a 3.0-hour trip, we must first figure out the total distance the car travels. With a speed of 70 miles per hour (mi/hr), the car would cover 70 mi/hr x 3 hours = 210 miles.

Next, we will have to convert miles to kilometers since the fuel consumption rate is given in kilometers per liter (km/L). So, 210 miles ≈ 321.87 kilometers (using conversion factor 1 mile ≈ 1.60934 kilometers).

The car uses gasoline at a rate of 11 kilometers per liter. Therefore, it would consume 321.87 kilometers ÷ 11 km/L ≈ 29.26 liters of gas.

Finally, since gas is usually measured in the U.S. in gallons, we need to convert liters to gallons. 29.26 liters ≈ 7.73 gallons (using conversion factor 1 liter ≈ 0.264172 gallons).

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Answer:

                   T₁  =  194 K

Solution:

Data Given:

                 Initial Temperature  =  T₁  =  ??

                 Final Temperature  =  T₂  =  465 K

                 Initial Pressure  =  P₁  =  18.7 psi

                 Final Pressure  =  P₂  =  20.2 psi

                 Initial Volume  =  V₁  =  0.475 L

                 Final Volume  =  V₂  =  1.054 L

Formula Used:

Let's assume that the hydrogen gas in balloon is acting as an Ideal gas, the according to Ideal Gas Equation,

                 P V  =  n R T

where;  R  =  Universal Gas Constant  =  0.082057 atm.L.mol⁻¹.K⁻¹,

Taking number of moles and R constant we can have following formula for initial and final states,

                P₁ V₁ / T₁  =  P₂ V₂ / T₂

Solving for T₁,

                T₁  =  P₁ V₁ T₂ / P₂ V₂

Putting values,

                T₁  =  (18.7 psi × 0.475 L × 465 K) / (20.2 psi × 1.054 L)

               T₁  =  194 K

Answer:

194 K

Explanation:

Answer:

Histamine is a protein produced by mast cells in the body. It plays a very important role in the immune system of the body. Histamine is released in the body when affected by an allergen, e.g, pollen or animal dander. The immune system of the body will respond to such allergen by making more mucus in the nose by releasing histamine. There will be sneezing, itching, coughing and runny nose in response. This is a basic defense of the body's immune system to not enter any particle inside the body.

Answer: V= 44. 6 L

Explanation: use Boyle's Law

P1V1 = P2V2

Derive to find V2:

V2 = P1V1 / P2

= 937.57 Pa( 12.5 L ) / 262.52 Pa

= 44.6 L

368.92 g of HCOOH could be formed.

Explanation:

First we have to write the balanced equation as,

CH₃OH + O₂ → HCOOH + H₂O

Here the question said that 8.02 mol of CH₃OH and 15.49 mol of O₂.

In the above reaction methanol and oxygen is used in 1:1 ratio, but the moles are lesser in case of methanol, so CH₃OH  is the limiting reagent.

Now by making use of 8.02 moles of methanol, we can produce 8.02 mol of HCOOH.

Molar mass of HCOOH is 46 g/mol.

So mass of HCOOH formed is moles ×molar mass of HCOOH.

8.02 moles × 46 g/mol = 368.92 g of HCOOH could be formed.

Answer:

A. The electric energy is due to the protons’ charges and positions within an electric field, so their energy is a form of potential energy.

Explanation:

Proton is subatomic particle with positive charge. Things with charge will pull the opposite charge and repel/push the same charge. The closer their position, the higher the energy will be. It should be potential energy since your location(how close it is) determine how strong the energy.

It's not thermal or kinetic energy since this doesn't involve any movement yet.

Answer:

A and i think D

Explanation:

Answer:

Can confirm that its A and D.

Explanation:

ape-x

Answer:

e65

Explanation:

cadhff

Air bags help lessen injuries in an automobile crash.  --> Boyle's law

A helium balloon decreases in size when you put it into a freezer.  --> Charle's law

A can of spray paint will explode if tossed into a fire --> Gay Lussac's Law

Explanation:

- Boyle's law states that for a fixed mass of an ideal gas kept at constant temperature, the pressure of the gas (p) is inversely proportional to its volume (V):

[tex]p \propto V[/tex]

- Charle's law states that for a fixed mass of an ideal gas kept at constant pressure, the volume of the gas (V) is proportional to its absolute temperature (T):

[tex]V\propto T[/tex]

- Gay-Lussac's Law states that for a fixed mass of an ideal gas kept at constant volume, the pressure of the gas (p) is proportional to the absolute temperature (T):

[tex]p\propto T[/tex]

We can now use these three laws to explain the mentioned phenomena:

Air bags help lessen injuries in an automobile crash.  --> Boyle's law. In fact, as the volume of the gas inside the air bag increases, the pressure exerted by the gas inside decreases, and since the temperature is constant, the pressure exerted by the airbag on the passenger will be lower.

A helium balloon decreases in size when you put it into a freezer.  --> Charle's law. When the balloon is put into the freezer, its temperature decreases, and since the pressure inside the freezer is approx. constant, the volume of the balloon decreases as well.

A can of spray paint will explode if tossed into a fire --> Gay Lussac Law. Due to the fire, the temperature of the gas inside the can increases; since the volume is constant, the pressure will increase, and at some point it will be large enouth to cause the can to explode.

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The scenarios involving air bags, helium balloons in a freezer, and an exploding can of spray paint are explained by Gay-Lussac's Law and Charles's Law, relating to the pressure, temperature, and volume of gases.

The gas laws that explain each scenario provided are based on the relationships between pressure, volume, and temperature for a gas.

Answer:

                       1.42 g/mL

Explanation:

                    The mass per unit volume is called as density. It is an intensive property and its value doesn't depend upon the amount of a substance.

It is given as,

                                   Density  =  Mass / Volume

Data Given:

Mass of Liquid + Flask  =  163.4 g

Volume of Liquid = 5.98 mL

Mass of empty Flask = 154.9 g

Mass of Liquid  = 163.4 g - 154.9 g =  8.5 g

Formula Used:

                     Density  =  Mass / Volume

                     Density  =  8.5 g / 5.98 mL

                     Density  =  1.42 g/mL

Answer:

             The complete chemical equation is as;

                                          C + O₂   →   CO₂

Explanation:

                    According to law of mass conservation the mass in isolated system can neither be created nor be destroyed. Applying this law to given synthesis reaction means that,

               (i) If there is one carbon atom on left hand side of the equation (reactant side) then there must be on e carbon on right hand side (product side) of the equation.

                (ii) If there are two oxygen atoms on left hand side of the equation (reactant side) then there must be two oxygen atoms on right hand side (product side) of the equation.

Hence, from equation it is proved that it obeys the said law and the number of atoms on both side are equal i.e.

                           Reactant Side                     Product Side

Carbon                          1                                          1

Oxygen                          2                                         2

Answer:

[tex]\large \boxed{\text{8.00 mol}}[/tex]

Explanation:

We will need a balanced chemical equation with masses, moles, and molar masses.

1. Gather all the information in one place:

Mᵣ:                  18.02

            2Na + H₂O ⟶ 2NaOH + H₂

m/g:                72.0  

2. Moles of H₂O

[tex]\text{Moles of H$_{2}$O} = \text{72.0 g H$_{2}$O} \times \dfrac{\text{1 mol H$_{2}$O}}{\text{18.02 g H$_{2}$O}} = \text{3.996 mol H$_{2}$O}[/tex]

3. Moles of Na

The molar ratio is 2 mol Na/1 mol H₂O.

[tex]\text{Moles of Na} = \text{3.996 mol H$_{2}$O} \times \dfrac{\text{2 mol Na}}{\text{1 mol H$_{2}$O}} = \textbf{8.00 mol Na}\\\\\text{The water will react with $\large \boxed{\textbf{ 8.00 mol}}$ of Na}[/tex]

Final answer:

To find out how many moles of sodium would react with 72.0 grams of water, we calculate moles of water using its molar mass and then apply the stoichiometry of the reaction between sodium and water. We conclude that 4 moles of sodium would react with 72.0 grams of water.

Explanation:

The question appears to contain a typo and seems to ask how many moles of sodium would react with 72.0 grams of water.

Molar mass of water (H₂O) is approximately 18.02 g/mol. Therefore, to find out how many moles of water we have in 72.0 grams, we use the formula:

moles of H₂O = mass of H2O / molar mass of H₂O

moles of H₂O = 72.0 g / 18.02 g/mol = 4 moles of H₂O

The reaction between sodium (Na) and water (H₂O) typically forms sodium hydroxide (NaOH) and hydrogen gas (H2). The balanced chemical equation for this reaction is:

2Na + 2H₂O → 2NaOH + H2

From the balanced reaction, we can see that 2 moles of Na are required to react with 2 moles of H₂O. This means, to react with 4 moles of H₂O, we would need 4 moles of Na.

Fungi play a crucial role in the food web shown as they are decomposers. They break down dead organic matter, such as dead plants and animals, and recycle the nutrients back into the ecosystem.

Microbes, or microorganisms, play important roles in food webs and ecosystem functioning. They can be found at all trophic levels of the food web, from primary producers to top predators, and their activities have significant impacts on the cycling of energy and nutrients.

In this food web, the fungus likely feeds on dead organic matter produced by the other organisms in the ecosystem, such as the sloth and the fruit bat.

This recycling of nutrients helps to maintain the balance of the ecosystem and supports the growth of other organisms in the food web, such as the strangler fig which may benefit from the nutrients provided by the decomposing organic matter.

Without decomposers like fungi, dead organic matter would accumulate in the ecosystem, leading to nutrient depletion and the eventual collapse of the food web.

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Answer:

5878.6 j

1.405 cal

Explanation:

Given data:

Specific heat of fat = 0.45 cal/g.°C or 1.9 j/g.°C

Density of fat = 30.94 g/cm³

Initial temperature = 25°C

Final temperature = 35°C

Energy needed = ?

Volume of fat = 10 cm³

Solution:

First of all we will calculate the mass of fat from given density and volume.

d = m/v

30.94 g/cm³ = m/ 10 cm³

m = 30.94 g/cm³ ×  10 cm³

m = 309.4 g

Now we will calculate the energy needed for fat.

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = T2 - T1

ΔT =  35°C -  25°C

ΔT =  10°C

Q = m.c. ΔT

Q = 309.4 g . 1.9 j/g.°C . 10°C

q = 5878.6 j

In calories,

5878.6 / 4184 = 1.405 cal

The energy required to heat 10cm3 of fat from 25°C to 35°C is calculated using the specific heat formula. The calculations in calories and joules are 42.3 cal and 178.6 Joules respectively.

To calculate the amount of energy needed to heat 10 cm3 of fat from 25 °C to 35 °C, we have to understand the concept of specific heat, which is the energy required to raise the temperature of 1 gram of a substance by 1 °C. Here, we are dealing with the substance fat, which has a specific heat of 0.45 cal/(g ⋅ °C) or 1.9 J/g °C and a density of 0.94 g/cm3.

First, determine the mass of the fat using the formula mass = volume × density. Here, volume is 10 cm3 and density is 0.94 g/cm3, which gives us a mass of 9.4 g. The change in temperature (ΔT) we need is from 25°C to 35°C, hence ΔT = 35 - 25 = 10 °C.

The energy required can then be calculated using the formula energy = mass × specific heat × ∆T. For calories, the calculation is energy = 9.4g × 0.45 cal/(g °C) × 10 °C = 42.3 cal. For Joules, the calculation is energy = 9.4 g × 1.9 J/(g °C) × 10°C = 178.6 Joules.

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Answer:

h2*

Explanation:

Final answer:

In a balanced chemical equation, if a coefficient is "1", it is typically left blank. Coefficients are used to ensure the same number of each atom on both sides of the equation and represent relative amounts of reactants and products in the simplest whole-number ratio.

Explanation:

The student's question is about understanding how coefficients are represented in a balanced chemical equation. When balancing chemical equations, it's important to adjust coefficients to ensure the same number of atoms of each element are on both sides of the equation. If a coefficient is "1", it is typically not written explicitly. For example, the balanced chemical equation for photosynthesis is 6CO2 + 6H2O → C6H12O6 + 6O2, where the coefficient of 1 for glucose is understood and therefore left blank. It's also critical to understand that coefficients should be in the simplest whole-number ratio, and they represent the relative amounts of substances involved in the reaction. For instance, when methane reacts with oxygen to yield carbon dioxide and water, the coefficients indicate a ratio of 1:2:1:2 for methane, oxygen, carbon dioxide, and water respectively.

Answer:

u gotta have the volume of it

Explanation:

Answer: 85.8 g AlCl3

Explanation:

Convert molecules of AlCl3 to moles using the Avogadro's number

Convert moles of AlCl3 to mass using its molar mass.

3.913x10²³ molecules AlCl3 x 1mole AlCl3 / (6.022x10²³ molecules AlCl3) X 132g AlCl3/ 1 mole AlCl3

= 85.8 g AlCl3

Answer:

[tex]\large \boxed{\text{4650 nm}}[/tex]

Explanation:

The second line in the Pfund series corresponds to a transition from n = 7 to n = 5.

To calculate the wavelength of the transition, we can use the Rydberg equation:

[tex]\dfrac{1}{\lambda} = R_{H}\left ( \dfrac{1 }{n_{1}^{2}} - \dfrac{1 }{n_{2}^{2}} \right )[/tex]

where

[tex]R_{H} = 1.097 \times 10^{7} \text{ m}^{-1}[/tex]

If n₁ = 5 and n₂ = 7

[tex]\begin{array}{rcl}\dfrac{1}{\lambda} & = & 1.097 \times 10^{7} \text{ m}^{-1}\left ( \dfrac{1 }{5^{2}} - \dfrac{1 }{7^{2}} \right )\\\\ & = & 1.097 \times 10^{7} \text{ m}^{-1}\left ( \dfrac{1 }{25} - \dfrac{1 }{49} \right )\\\\ & = & 1.097 \times 10^{7} \text{ m}^{-1}\left ( \dfrac{49 - 25 }{49 \times25}\right )\\\\& = & 1.097 \times 10^{7} \text{ m}^{-1}\left ( \dfrac{24 }{1225}\right )\\\\ & = & 2.149 \times 10^{7}\text{ m}^{-1}\\\end{array}\\[/tex]

[tex]\begin{array}{rcl}\lambda & = & \dfrac{1}{2.149 \times 10^{7}\text{ m}^{-1}}\\\\ & = & 4.65 \times 10^{-6} \text{ m}\\ & = & \mathbf{4650} \textbf{ nm}\\\end{array}\\\text{The wavelength of the line is $\large \boxed{\textbf{4650 nm}}$, which is in the $\textbf{infrared region}$}.[/tex]

The calculated wavelength for the second line in the Pfund series is 4.65 x 10^-6 m (4650 nm), positioning it within the infrared spectrum.

Rydberg Equation:

The Rydberg equation is employed to calculate the wavelength (λ) of light emitted or absorbed during electronic transitions in hydrogen-like atoms.

"1/λ = RH (1/n₁² - 1/n₂²)"

Given Values:

We are given the Rydberg constant (RH) as "1.097 x 10^7 m^-1" and the principal quantum numbers (n₁ = 5 and n₂ = 7).

Substitute Values:

Substituting the known values into the Rydberg equation:

"1/λ = 1.097 x 10^7 (1/5² - 1/7²)"

Evaluate Exponents:

Calculating the squares in the denominators:

"1/λ = 1.097 x 10^7 (1/25 - 1/49)"

Find Common Denominator:

Combining the fractions over a common denominator (1225):

"1/λ = 1.097 x 10^7 (49 - 25)/1225"

Combine Terms:

Simplifying the expression:

"1/λ = 1.097 x 10^7 (24/1225)"

Calculate:

Performing the multiplication:

"1/λ = 2.149 x 10^7 m^-1"

Reciprocal to Find Wavelength:

Taking the reciprocal to find the wavelength:

"λ = 1/(2.149 x 10^7)"

Final Result:

Converting the numerical result to scientific notation:

"λ = 4.65 x 10^-6 m"

= 4650nm

This detailed calculation ensures a comprehensive understanding of each step involved in determining the wavelength.

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Answer:

8 electrons

Explanation:

For the two atoms to have an octet configuration, they must share

8 electrons. Two of the atom with six valence electron will bond with one of the atom with four valence electrons. This is clearly seen when carbon react will sulphur to form carbon disulfide. They form covalent double bond (S=C=S)

Answer:

protists are part of the domain eukarya

protists make up the kingdom protista

hope this helps x

Answer:

They all vibrate, but they all move differently.

Explanation:

Similarities: They all consist of particles and vibrate, just at different frequencies.

Differences: The particles in solids move slowly and vibrate. In liquids, they move a bit quicker and slide past one another. They will also take the shape of the container they're in. In gases, they move freely at high speeds and also taking the shape of the container.

Hope this helped! :)

It is a radio wave

Explanation:

The energy of an electromagnetic waves is related to its frequency by the equation:

[tex]E=hf[/tex]

where

h is the Planck constant

f is the frequency of the wave

We notice that the energy of an electromagnetic wave is proportional to its frequency. This means that waves with higher frequencies, such as gamma rays, x-rays, are more energetic, while waves with lower frequencies, such as microwave and radio waves, are the less energetic.

In this case, we want to find the frequency of a wave with energy

E = 0.000001 eV

Converting into Joules,

[tex]E=1\cdot 10^{-6} eV \cdot 1.6\cdot 10^{-19} J/eV=1.6\cdot 10^{-25} J[/tex]

Solving for the frequency,

[tex]f=\frac{E}{h}=\frac{1.6\cdot 10^{-25}}{6.63\cdot 10^{-34}}=2.4\cdot 10^8 Hz = 240 MHz[/tex]

Which falls in the range of frequency of radio waves.

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Answer:

Radio waves,because a radio wave has a longer wavelength than both infrared and X-rays, so it has less energy

Explanation:



Answer:

only compounds with the (aq) state symbol

Only compounds with the an aqueous (aq) state symbol break up into ions in solution.

The solution in which water is present as solvent. The solute dissolved in water and form an ions which is surrounded by water molecules.

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Answer:

positive

Explanation:

lost of negative electron leaves one more positive charges than negative charges.

If the applied force on a car is cut in half, the acceleration is also halved, as acceleration is directly proportional to force.

Based on Newton's second law of motion, acceleration (a) is directly proportional to the net applied force (Fnet) and inversely proportional to the mass (m) of the object, which is expressed by the formula a = Fnet/m. From the question, if the applied force to a car is cut in half, the acceleration would also be reduced by half, assuming the mass of the car remains constant. If the initial acceleration was a, then the new acceleration would be a/2 when the force is halved.

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