Write the balanced COMPLETE ionic equation for the reaction when Na₂CO₃ and AgNO₃ are mixed in aqueous solution. If no reaction occurs, write only NR.

Answer:

B) 87g

Explanation:

Usatestprep said it

Final answer:

To prepare 0.50 L of a 1.0 M solution of potassium sulfate, 87 g of the solute is needed. So the correct option is B.

Explanation:

To prepare a 0.50 L of a 1.0 M solution of potassium sulfate (K₂SO₄), first, we need to calculate the number of moles of the solute needed using the molarity equation, M = moles/L. For a 1.0 M solution, we need 1.0 mole of K₂SO₄ per liter. However, since we're preparing only 0.50 L, we need 0.50 moles of K₂SO₄.

Molar mass of K2SO4 = 2(K) + S + 4(O) = 2(39.10) + 32.07 + 4(16.00) = 174.27 g/mol.

Mass of K2SO4 needed = moles × molar mass = 0.50 moles × 174.27 g/mol = 87.135 g.

Using the correct significant figures, the mass of the solute needed is 87 g, which corresponds to option B.

Answer:

HNO3 is nitric acid. NH3 is ammonia, NaCl is common salt. O is an atom of oxygen. No idea about remaining.

Answer:

HI and HNO3 are acids

Explanation:

Answer:

B) water displacement

Explanation:

C and D are incorrect because they are formulas to find volume for specific shapes.  That wouldn't work here since you have an irregularly shaped solid object.

A is incorrect because a triple beam balance is used to find mass.

Final answer:

To determine the volume of an irregular shaped solid object, the correct method is water displacement, which measures the volume of water the object displaces when submerged.

Explanation:

The proper way to find the volume of an irregular shaped solid object is B) water displacement. Unlike regular solids, which can be calculated geometrically using formulas such as Length x Width x Height for rectangular prisms, or πr²h for cylinders, irregularly shaped objects do not conform to simple mathematical formulas. The water displacement method involves submerging the object in water and measuring the volume of water displaced, which equals the volume of the object. This technique is based on Archimedes' principle, which states that the volume of the fluid displaced by an object is equal to the volume of the object itself.

Final answer:

To find the number of moles of CO₂ produced from 79.0 g of C₃H₈, convert the mass of C₃H₈ to moles and then use the mole ratio from the balanced combustion equation to find the moles of CO₂produced, which is approximately 5.37 moles.

Explanation:

To calculate the number of moles of CO₂ produced from 79.0 g of C₃H₈ (propane), you need the balanced chemical equation for the combustion of propane, which is:

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

According to this equation, one mole of propane produces three moles of CO₂. First, we need to determine the number of moles of C₃H₈ present in 79.0 g. The molar mass of propane (C₃H₈) is 44.1 g/mol.

To find the moles of propane, we use the formula:

moles of propane = mass (g) / molar mass (g/mol)

moles of propane = 79.0 g / 44.1 g/mol ≈ 1.79 mol

Now, to find the moles of CO₂ produced from the combustion of 1.79 mol of propane:

moles of CO₂ = moles of C3H8 x (3 moles CO₂ / 1 mole C₃H₈)

moles of CO₂= 1.79 mol x 3 ≈ 5.37 mol

Therefore, the combustion of 79.0 g of C₃H₈ will produce approximately 5.37 moles of CO₂.

An ecosystem is the specific environment in which an organism lives and includes the living and non-living components that organisms interact with. It's a site of competition for limited resources, influenced by numerous environmental variables, ultimately determining which organisms can exist within that ecosystem.

The specific environment in which an organism lives is also referred to as its ecosystem. An ecosystem is a community of living organisms interacting with each other and their non-living (abiotic) environment. This can be as small as a tide pool or as vast as the Amazon Rainforest. These ecosystems are often sites of competition for limited resources, which include organic material, sunlight, and mineral nutrients. These resources are vital for an organism's survival and growth.

Competition arises both within species (intraspecific competition) and among different species (interspecific competition). This competition is driven by the theory of natural selection, where those organisms best adapted to their environment are more likely to survive and reproduce.

Other factors affecting an organism's life within an ecosystem include the ecosystem's physical and geographic environment, such as latitude, rainfall, topography, and available species. All these collectively decide which organisms can exist within a particular habitat.

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The calorimeter constant is 816.800 J/degree.

Explanation:

Data given:

volume of cold water = 50 ml

initial temperature of the cold water t1 = 19.1 degrees

volume of hot water = 50 ml

temperature of hot water t2 = 54.9 degrees

change in temperature  t3= 31.3 degrees

calorimeter constant = ?

energy gained by cold water = energy lost by hot water

q hot water = 50 x 4.184 x  (54.9-31.3)

q hot water = 50 x 4.184 x 23.6

                   = 4937.9 cal/degree

q cold water = 50 x 4.184 x (31.3-19.1)

q cold water = 2552.24 cal/deg

FINAL ENERGY = qhot water - q cold water

final energy = 4937.9 - 2552.24

final energy = 2385.66 cal/deg

calorimeter constant = [tex]\frac{final energy}{t3-t1}[/tex]

putting the values:

calorimeter constant = [tex]\frac{2385.66}{12.2}[/tex]

                    CALORIMETER CONSTANT  = 195.22 J/deg

to convert in joules/degree multiply the value with 4.184

= 195.22 x 4.184

= 816.800 J/deg

A reviewing committee would conduct extensive clinical trials involving actual patients to ensure the new pill's safety and effectiveness before it can be approved for public use. The FDA requires this rigorous testing process to establish the drug's success rate compared to a control group.

Before approving a pill for public use that claims to reduce chest pains, a reviewing committee would MOST LIKELY conduct many trials using actual patients to determine the drug's success rate. This involves a series of large-scale experiments and clinical trials to ensure the drug is safe and effective. The trials would compare the outcomes of participants taking the medication against a control group that does not take the medication. Additionally, the FDA requires significant data from these trials to consider approving the drug for market.

Testing the efficacy of a drug is a thorough process that includes gathering enough data to compare experimental and control groups, assessing statistically significant differences in outcomes, and evaluating the drug's safety through careful monitoring by a pharmacovigilance system.

Final answer:

A reviewing committee would most likely conduct many clinical trials with actual patients to determine the success rate and safety of a new pill for reducing chest pains before it is approved for public use.

Explanation:

Before approving a new drug for public use, a reviewing committee would most likely opt for conducting rigorous clinical trials involving actual patients. The correct answer is B) The committee would conduct many trials using actual patients to determine the drug's success rate. The process includes closely monitoring the drug's efficacy in treating the targeted condition, its overall safety, and any potential side effects. These trials are divided into different phases, with Phase 3 clinical investigation being particularly crucial as it assesses the risk versus benefit of the new pharmaceutical on a large scale, involving hundreds to thousands of patients.

Only when there is substantial evidence supporting the new treatment's benefits, and the results can be replicated, does the committee consider the drug to be supported by evidence. The approval process is thorough and can take several years, involving not only the participation of physicians and chemists but also adherence to guidelines for testing the drug's toxicity and impact on human health.

Answer:

Arteries have a larger space inside blood vessels

Electrons have a negative charge and orbit around the nucleus, while protons have a positive charge and are found in the nucleus. Neutrons have no charge and are also found in the nucleus with protons.

I hope this helps! If you have any doubts, feel free to ask.

your answer is  C and D

Answer:

1. Soap, and Detergent.

2.Maybe Alchohol, and Oil

3.chalk and water, and flour and water.

4. Air and fog

5.Whipped cream, and jelly

6. plaster and colored glass

Answer : The pressure of the dry gas at stp is, 0.602 mmHg

Explanation :

Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.

The combined gas equation is,

[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]

where,

[tex]P_1[/tex] = initial pressure of gas = 636 mmHg

[tex]P_2[/tex] = final pressure of gas = ?

[tex]V_1[/tex] = initial volume of gas = 23 mL = 0.023 L

[tex]V_2[/tex] = final volume of gas at STP = 22.4 L

[tex]T_1[/tex] = initial temperature of gas = [tex]23^oC=273+23=296K[/tex]

[tex]T_2[/tex] = final temperature of gas at STP = [tex]0^oC=273+0=273K[/tex]

Now put all the given values in the above equation, we get:

[tex]\frac{636mmHg\times 0.023L}{296K}=\frac{P_2\times 22.4L}{273K}[/tex]

[tex]P_2=0.602mmHg[/tex]

Therefore, the pressure of the dry gas at stp is, 0.602 mmHg

Answer:

they slow down and get close together

Explanation:

low temperature lowers kinetic energy in particles hence they slow down and get close together thereby causing shrinking of the particles

Answer:

They slow down and get closer together

Explanation:

265

Explanation:

660 divided by 2.5 equals 265. The frequency is 265.

Answer:

132Hz

Explanation:

the explanation is in the picture

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Answer:

B pancreas, since the pancreas secretes insulin

Explanation:

Answer:

pancreas

Explanation:

Answer:

I think adding a catalyst

Explanation:

From what I found, any of the first 4 don't work, reducing the concentrations of reactant molecules just decreases the chances of it reacting, decreasing the temperature does more or less the same, as it takes away energy, decreasing the surface area of the particles does more or less nothing in this situation, but for a reaction to occur, you need to add energy, which only the catalyst does. good luck!

Answer:

1.) phenolphthalein

2.) neutral and acidic

3.) basic

Explanation:

Answer: Phenolphthalein was used as an indicator because it is colorless in neutral and acidic solutions and pink in basic solutions.

Explanation:

Recall that in the lab we added enough of the base NaOH so that the indicator turned pink. Prior to the solution turning pink, the solution was acidic (HCl) → neutral. Furthermore, phenolphthalein is used as an indicator of basic solutions.

The equivalence/equilibrium point occurs at ph 7.

Phenolphthalein causes solutions to become pink around pH 8.2 (a basic pH). Therefore, we added slightly more NaOH than actually needed to neutralize the acid.

Answer:

516.8 K or 243.8 C

Explanation:

- First figure out which gas law to use. In this case we need to use Gay-Lussac's law. This is P1/T1 = P2/T2.

- Next, we need to rearrange this to fit our problem. We should do...

T2 = T1P2/P1

- Now, we need to find our variables. For example...

T1 = 323 K

P1 = 2.00 atm

P2 = 3.20 atm

Next, fill in these numbers to fit our equation. For example...

T2 = 323 x 3.20 / 2.00 = 516.8 K

Note, you did not specify whether you wanted final answer in K or C, so I will put both. I suggest using K if nothing is stated for what they want.

- Hope this helps! If you need a more in-depth explanation please let me know.

Answer:244

Explanation:

Answer: Density is defined as the ratio between mass and volume or mass per unit volume.

Explanation:

With some help from google, i got you an answer.

The density, of a substance is its mass per unit volume. The symbol most often used for density is ρ, although the Latin letter D can also be used. Mathematically, density is defined as mass divided by volume: where ρ is the density, m is the mass, and V is the volume.

Answer:

Explanation:

This question is part of a Post-Lab exercise sheet.

Such sheet include the saturation concentrations for several salts.

The saturation concentration of Copper Sulfate, CuSO₄, indicated in the table is 1.380M.

That means that 1.380 moles of copper sulfate is the maximum amount that can be dissolved in one liter of solution.

Find the molar concentration for 4.6 moles of copper sulfate in 1,750 mL of water.

You need to assume that the volume of water (1750mL) is the volume of the solution. This is, that the 4.6 moles of copper sulfate have a negligible volume.

1. Volume in liters:

2. Molar concentration, molarity, M:

Since the solution is saturated at 1.380M, you cannot reach the 2.6M concentration, meaning that you cannot dissolve 4.6 moles of copper sulfate, CuSO₄ in 1750mL of water.

Adding solute to the saturated solution. will leave solids at the bottom of the container, without changing the concentration of the solution.

Reasons:

The maximum solubility of copper sulfate, CuSO₄ in water at  20°C is 20.7 grams in 100 g of water;

Density of water, ρ = 997 kg/m³

[tex]\displaystyle \ The \ volume \ 100 \ g \ of \ water = \frac{0.1 \, kg}{997 \, kg/m^3} \approx 1.003 \times 10^{-4} \ m^3 = 100.3 \, ml[/tex]

The number of moles, n, of CuSO₄ in 20.7 grams is given as follows;

[tex]\displaystyle n = \frac{20.7 \, g}{159.609 \, g/mol} \approx 0.1296919 \, moles[/tex]

0.1296919 moles can be dissolved in 100.3 mL of water

Therefore;

[tex]1750 \, mL \ of \ water \ an \ dissolve\ \displaystyle \frac{0.1296919 \ moles}{100.3 \, mL} \times 1750 \, mL \approx 2.263 \ moles[/tex]

The maximum amount of copper sulfate that can be dissolved in 1,750 mL of water at 20°C is 2.263 moles.

Therefore;

This is so because the solubility of copper sulfate in 1750 mL of water is approximately 2.263 moles, which is less than the given 4.6 moles.

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Answer:

A) sulfur - 32

Explanation:

In periodic table you can see that S has average atomic mass = 32.06

It is closest to 32, that means that most of the atoms are isotopes sulfur-32.

The most common isotope of sulfur is sulfur-32 (32S), as it has the highest natural abundance among sulfur isotopes at 95.02% and aligns with the atomic mass listed on the periodic table.

Using a periodic table, the most common isotope of sulfur can be determined to be sulfur-32 (32S). This is because the weighted average of sulfur's atomic mass on the periodic table closely aligns with the mass number of sulfur-32, indicating its high natural abundance. To confirm, the major isotopes of sulfur are 32S with a 95.02% abundance, 33S with a 0.75% abundance, 34S with a 4.21% abundance, and 36S with a 0.02% abundance. Therefore, the most common isotope of sulfur is sulfur-32 (32S), which coincides with option A in the question provided.

Answer:

I'm not sure that is the full question can you show a picture or something?

the string of a bow and arrow is pulled tight with Elastic

The correct option is (c).

When the string of a bow and arrow is pulled tight, the energy stored in the string is primarily due to its deformation, which is a characteristic of elastic potential energy.

c. Elastic potential energy arises from the deformation of an object, such as stretching a spring or pulling a rubber band. When the string of the bow and arrow is pulled tight, it undergoes deformation, storing potential energy in the form of elastic potential energy. This energy is then released when the string is released, propelling the arrow forward.

a. Gravitational potential energy refers to the energy associated with an object's position in a gravitational field. While gravity does play a role in the bow and arrow system (as it affects the trajectory of the arrow), the energy stored in the string itself is not primarily gravitational potential energy.

b. Chemical potential energy refers to the energy stored in chemical bonds, which is released during a chemical reaction. The action of pulling the string tight does not involve any chemical reactions, so it is not chemical potential energy.

d. Electric potential energy refers to the energy stored in an electric field due to the position of charged particles. The energy stored in the string of a bow and arrow is not related to electric potential energy.

complete question given below:

The string of a bow and arrow is pulled tight with?

a.Gravitational

b.Chemical

c.Elastic

d.Electric

Answer:

Electrical into sound and light

Answer:

When we turn on the television, electrical energy changes into light and sound. Even though undesirable, some amount of heat is also produced. When we move a vehicle, the engine converts the chemical energy stored in the fuel into heat, sound and kinetic energy.

Final answer:

The molarity of a 0.15m potassium sulfate solution diluted from 100ml to 150ml is calculated using the dilution equation M1 × V1 = M2 × V2, resulting in a new molarity of 0.10M.

Explanation:

When you dilute a 0.15m potassium sulfate solution from 100ml to 150ml, the molarity of the solution changes.

To calculate the new molarity after dilution, you can use the dilution equation: M1 × V1 = M2 × V2, where M1 is the initial molarity, V1 is the initial volume, M2 is the final molarity, and V2 is the final volume.

Here, M1 is 0.15M, V1 is 100ml, V2 is 150ml, and M2 is what we're trying to find.

Plugging in the values into the equation: 0.15M × 100ml = M2 × 150ml, we can solve for M2, which is the final molarity: M2 = (0.15M × 100ml) / 150ml = 0.10M.

Therefore, after dilution, the concentration of the solution becomes 0.10M.

Answer:

b

Explanation:

Answer:

Because of oxygen toxicity.

Explanation:

Oxygen toxicity.

Oxygen has been known to cause central nervous system (CNS) toxicity when the pressure gets higher. This toxicity can cause convulsions, and this can cause the diver to drown.

The current standard maximum safe oxygen working pressure is 1.4 atm ppO2. This is equal to 56.5m/185′ when breathing air (21% O2 / 79% N). Below that depth the fraction of oxygen in a breathing gas must be reduced, and in order to maintain this maximum pressure of 1.4 ppO2, Helium must be added.

Talent is an acquired ability resulting from hard work. The correct option is B.

The most important factor in achieving success is hard work. It is impossible to achieve success without putting in the effort.

A person who sits and waits for a better opportunity will never gain anything. A person who works hard can achieve success and happiness in life.

Hard work is the practice and preparation you put in to hone and improve your natural abilities and skills.

As a result, hard work gets you to the finish line ahead of the competition. Here's another example of how hard work outperforms talent.

The term talent refers to a person's innate and unique ability to do something. A skill is knowledge that a person gains through learning.

Thus, the correct option is B.

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A talent is a natural ability to do something well, although it often requires further development through practice. In acting, talent comprises intuitive skills like character understanding and captivating an audience, but like in all disciplines, this natural aptitude must be nurtured to achieve mastery and is complemented by creativity.

A talent is commonly understood as a natural ability to do something well. It is an inherent aptitude that gives individuals a certain edge in specific tasks or skills without needing extensive training from the outset. However, it is important to recognize that while talent provides a foundation, the development and refinement of any skill, including those in the creative arts like acting, require practice and dedication. Within the context of acting, elements of talent might include an intuitive understanding of character, emotional depth, timing, and the ability to captivate an audience. Yet, these innate abilities must be honed through persistent effort and engagement with the craft. In relation to creativity, it is a form of intelligence that can be manifested in various disciplines and areas of life, not just limited to the arts. It involves bringing into existence new ideas, solutions, or methods, and a person's creativity can enhance their natural talents, be it in acting, design, direction, or any other artistic endeavor.

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