Question 7 of 10
Which two objects would experience the greatest gravitational force between
them?
A. Two objects positioned 100 miles apart
B. Two objects positioned 1000 miles apart
C. Two objects positioned 10 miles apart
OD. Two objects positioned 1 mile apart

Answer: There are approximately 141.7 moles

Explanation:

To convert the number of molecules of a substance to the number of moles, we need to divide the number of molecules by Avogadro's Number, which is approximately 6.022 x 10^23 molecules per mole.

Therefore, to calculate the number of moles in 8.52 x 10^33 molecules of carbonic acid (H2CO3), we can use the following formula:

Number of moles = Number of molecules / Avogadro's Number

Number of moles = 8.52 x 10^33 / 6.022 x 10^23

Number of moles = 141.7 mol

Therefore, there are approximately 141.7 moles of carbonic acid in 8.52 x 10^33 molecules of carbonic acid.

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Answer:

0.033 moles of KCl are formed.

Explanation:

The reaction that takes place is:

To solve this problem we need to convert 0.05 moles of O₂ into moles of KCl, to do so we use the stoichiometric coefficients of the balanced reaction:

If 0.05 moles of O₂ are produced, then 0.033 moles of KCl are formed as well.

The statement "the more acidic a solution, the more hydrogen ions (protons) present. This speeds up reactions from increasing the number of hydrogen bonds" is not accurate.

In reality, the acidity of a solution is related to the concentration of hydrogen ions (H+) in the solution. When an acid is dissolved in water, it dissociates to release hydrogen ions, which can react with other substances in the solution. Thus, the more acidic a solution, the higher the concentration of hydrogen ions.

However, the presence of hydrogen ions alone does not necessarily speed up reactions or increase the number of hydrogen bonds. Hydrogen bonds are formed between hydrogen atoms and electronegative atoms like oxygen or nitrogen. In some cases, the presence of hydrogen ions can promote the formation of hydrogen bonds, but in other cases, it may not have any effect or even inhibit hydrogen bond formation.

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Here is a picture that might help :)

Answer:

Explanation: a

The statement explains within the motor when an electric current flows through the loop of wire is "the loop becomes an electromagnet, which causes the loop to flip and produce mechanical energy."

A stream of charged particles, such as electrons or ions, travelling through an electrical conductor or space is known as an electric current. The current in a wire with electrons as charge carriers is a measurement of the amount of charge travelling through any point of the wire per unit of time.

A magnetic field is created along the axis of a wire loop by a current flowing through it.

Curling the fingers of the right hand in the direction of the current through the loop, the thumb then points in the direction of the magnetic field, reveals the direction of the field inside the loop.

Wire loops in a magnetic field are used in motors. The magnetic field exerts tension on the loops when current is passed through them, which rotates a shaft. In the process, electrical energy is transferred to mechanical work.

Hence the correct option is A.

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The molecular formula of the given is 0.519.

To calculate the molecular formula we need a simple formula,

molecular formula = divide the molecular mass / empirical formula

So, the known are

molecular mass = 62 g/mol

empirical formula = CH₃O

C = 38. 7%

H = 9. 7%

O =  51. 6%

empirical formula = 38. 7% + (9. 7% x 3) + 51. 6%

empirical formula = 119.4

Now, putting the values in formula

molecular formula = molecular mass / empirical formula

molecular formula = 62 g/mol / 119.4

molecular formula = 0.519

Hence, the molecular formula is 0.519.

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Answer:differentiate between two compounds i think!

Explanation: taking a test!

Answer:(1) differentiate between two compounds

Explanation:

A Chemical property tells us the  characteristics of a particular matter or substance after a  chemical change. This property helps us to differentiate a compound from another or differentiate   elements or substances. Examples of a Chemical property are  acidity, reactivity and heat, etc .

For example to differentiate between Water H2O and  Hydrogen peroxide, H202

Even though they are made up of  oxygen and hydrogen. Hydrogen peroxide  (H2O2), has  more(1) oxygen than water (H2O).

Using Acidity as a chemical property to differentiate these substances

Water, H20  is amphoteric in nature ie having both acidic and basic properties, while H202 is a weak acid.

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\(\qquad\qquad\huge\underline{{\sf Answer}}\)

Let's balance the given equation ~

\(\qquad \sf  \dashrightarrow \:S_8 + O_2 \rightarrow SO_3\)

\( \textsf{Step 1 - balance Sulphur (S) on both sides} \)

\( \textsf{[ By multiplying} \) \( \sf{SO_3} \) \( \textsf{by 8 on product side ]} \)

\(\qquad \sf  \dashrightarrow \:S_8 + O_2 \rightarrow 8 \: SO_3\)

\( \textsf{Step 2 - balance Oxygen (O) on both sides} \)

\( \textsf{[ By multiplying} \) \( \sf{O_2} \) \( \textsf{by 12 on reactant side ]} \)

\(\qquad \sf  \dashrightarrow \:S_8 +12 \: O_2 \rightarrow 8 \: SO_3\)

So, we can infer that the Correct choice is D

The empirical formula, which represents the simplest ratio of atoms in a compound, may be useful in the lab setting but not useful for predicting the properties and functions of materials.

In the lab, the empirical formula can be useful for identifying the composition of a compound, especially if the molecular formula is unknown. It can also help in determining the stoichiometry of a reaction, which can be important for conducting experiments. However, the empirical formula does not provide information about the actual number of atoms or the arrangement of atoms within a molecule, which can greatly affect the properties and functions of a material.

Therefore, while the empirical formula can be a useful tool in the lab setting, it may not be sufficient for predicting the properties and functions of materials. More detailed information about the molecular formula and structure is needed for accurate predictions.

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In order to accelerate the cart at a rate of 0.5/s2, the force needed is 37.5 N.

Acceleration is the rate of change of the velocity of an item with appreciation to time. Accelerations are vector portions. The orientation of an item's acceleration is given by the orientation of the net pressure appearing on that object.

Calculation:-

Mass = 75 kg

acceleration = 0.5 m/s²

F = ma

   = 75 × 0.5

  = 37.5 N

Acceleration is the charge at which velocity modifications with time, in terms of each speed and route. A factor or an object moving in a straight line is accelerated if it quickens or slows down. movement on a circle is extended despite the fact that the rate is consistent because the course is continually changing.

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The statement "the Bohr model was based on the helium atom and rings around the nucleus are called orbits" is partially true and partially false.

The Bohr model was actually based on the hydrogen atom, not the helium atom. However, it is true that the rings around the nucleus are called orbits. So, the correct answer would be that the statement is both true and false due to the inaccuracy regarding the atom the model was based on.

The statement mentioned in the question is not entirely accurate. The Bohr model was based on the hydrogen atom, not the helium atom. The Bohr model was developed to explain the hydrogen atom's atomic structure, which is simpler than the helium atom's atomic structure. The hydrogen atom has one electron and one proton, whereas the helium atom has two electrons and two protons.

On the other hand, the second part of the statement is accurate. The rings around the nucleus in the Bohr model are called orbits. These orbits are specific, quantized energy levels that electrons can occupy in an atom. When an electron transitions between these energy levels, it emits or absorbs a photon of specific energy, which gives rise to the spectral lines observed in atomic spectra.

Therefore, the statement "the Bohr model was based on the helium atom and rings around the nucleus are called orbits" is partially true and partially false. The first part of the statement is incorrect because the Bohr model was based on the hydrogen atom, not the helium atom. The second part of the statement is accurate because the rings around the nucleus in the Bohr model are called orbits.

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The synthesis of silver nanoparticles can involve various methods and conditions, but a general order of steps in a typical synthesis process might be as follows:

Preparation of the silver precursor: Silver nitrate (AgNO3) is commonly used as a silver precursor. It is dissolved in water or other suitable solvents to prepare a silver precursor solution.

Preparation of the reducing agent: A reducing agent, such as sodium borohydride (NaBH4) or sodium citrate, is prepared separately. The reducing agent will react with the silver precursor to form silver nanoparticles.

Mixing the silver precursor and reducing agent: The silver precursor solution and the reducing agent solution are mixed together under suitable conditions, such as controlled temperature and stirring, to allow the reduction reaction to occur.

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Answer:

2 - B, 5 - D, 6 - A

Explanation:

2 - Penicilin was actually discovered on accident!

5 - Microbes were discovered around the mid-1600s

6 - Choice A seems to be correct here, noting that the answers of C and D are marked out and B seems a bit far-fetched (from my current knowledge)

Answer:

C

Explanation:

The volume of a sphere is the amount of space inside a sphere. A sphere is a three-dimensional geometric shape that is perfectly round and is created by rotating a circle about its diameter.

To find the radius of the aluminum sphere, we need to use the formula for the volume of a sphere and the density of aluminum. The formula for the volume of a sphere is:

V = (4/3)πr³

The density of aluminum is 2.7 g/cm³. We can use the formula for density to find the volume of the sphere:

Density = mass/volume

Volume = mass/density

V = 37 g / 2.7 g/cm³

V = 13.7 cm³

Now we can plug the volume into the formula for the volume of a sphere and solve for the radius:

13.7 cm³ = (4/3)πr³

r³ = (13.7 cm³)(3/4π)

r³ = 10.4 cm³

r = ∛10.4 cm³

r = 2.2 cm

Since 1 inch is equal to 2.54 cm, we can convert the radius from cm to inches:

r = 2.2 cm * (1 inch / 2.54 cm)

r = 0.87 inches

To two significant figures, the radius of the aluminum sphere is 0.87 inches.

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The concentration of the HBr would be 0.09 M

First, let us look at the equation of the reaction:

\(HBr + NaOH --- > NaBr + H_2O\)

The mole ratio of HBr to NaOH is 1:1.

Mole of 15 mL, 0.30 M NaOH = 0.30 x 15/1000 = 0.0045 moles

Equivalent mole of HBr - 0.0045 moles

Molarity of HBr = mole/volume = 0.0045/50/1000 = 0.09 M

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The level of organization in an ecosystem is an individual plant or animal population. The correct option is A.

Ecosystem organization is the organization of all biotic and abiotic things present in an ecosystem. The ecosystem from smaller to largest is an organism, population, community, and ecosystem.

Individuals make up a population, populations make up a species, numerous species and their interactions make up a community, and when you include abiotic elements, multiple species, and their interactions' make up ecosystems. This is the ecological hierarchy.

Therefore, the correct option is A. Population

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Answer:

The process to use this knowledge is explained as below:

Explanation:

1. Farmer should use an indicator to check the pH value of the soil of the field of the farm.

2. If the field or the farm has alkali soil add acid to reduce the pH value.

3. If the soil of the farm is acidic for the crop add alkali to increase the pH value.

4. It will be a neutralization reaction and changes the pH value of the farm.

5. Weather/leeching into the surrounding soil/plant or animal waste will lead to a change in pH value over time.

6. The pH value will need to be regularly monitored and adjusted.

Answer:

C: was once buried underground

Explanation:

Hope this helps!

Answer:

The correct answer you are looking for is B i have got 100% on this test.

Explanation:

hop this helps! └(^o^)┘  ↖(^ω^)↗

The rate of consumption of Ca is 0.0833 g/s.

The rate of consumption of Ca can be determined by dividing the mass of Ca consumed (2.50 g) by the time taken for the reaction to occur (30.0 seconds). This gives us a rate of 0.0833 g/s, indicating that 0.0833 grams of Ca are consumed every second during the reaction at the given temperature.

In chemical reactions, the rate of consumption or production of a substance is typically expressed in terms of the change in concentration over time. In this case, since the mass of Ca consumed is given, we can directly calculate the rate of consumption.

It's important to note that the rate of consumption of Ca may vary with temperature and other reaction conditions. The given rate applies specifically to the given temperature and the specific reaction conditions mentioned in the problem.

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Answer:

nếu có 40g dung dịch NaOH 20% phairn dùng hết bao nhiêu gam dung dịch HCl 25% để trung hoà

Answer:

Explanation:

Given : Density - 2.41 g/liter  

Temperature - 25° C  

Pressure : 770 mm Hg  

R = 0.0821 L atm mol-¹K-¹

Find : Molecular mass of gas

Solution : Ideal gas equation with respect to density will be : PM = dRT. In the formula, P is pressure, M is molecular mass, d is density, R is gas constant and T is temperature.

Keeping the values in equation-  

Pressure : 770 mm Hg = 1 atm  

Temperature : 273 + 25 = 298 K

M = dRT/P  

M = (2.41*0.0821*298)/1  

M = 58.96 gram/mol

Thus, the molecular mass of gas is 58.96 gram/mol.

If CH\(_{3}\)COOH(aq) is used in place of glacial acetic acid in an experiment, the yield will be affected by being reduced  due to the difference in concentration and purity of the two solutions.

Glacial acetic acid is a highly concentrated and pure form of acetic acid, while CH\(_{3}\)COOH(aq) is a diluted solution of acetic acid in water. This may lead to a lower yield of the desired product as the reaction may not proceed as efficiently. Additionally, the impurities present in CH\(_{3}\)COOH(aq) may also interfere with the reaction, further reducing the yield. Therefore, it is important to use the correct reagents and ensure that they are of high purity to obtain accurate and reliable results in the experiment.

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The freeze-thaw resistance of hardened concrete can be improved by adding an air-entraining admixture to the concrete mixture. Option b is correct.

This admixture creates microscopic air bubbles in the concrete, which act as pressure relief points during freeze-thaw cycles. When water in the concrete freezes, it expands, and the air bubbles provide space for the ice to expand into, reducing the potential for damage to the concrete.

By incorporating an air-entraining admixture, the concrete becomes more resistant to the detrimental effects of freeze-thaw cycles, increasing its durability and lifespan in colder climates.

Therefore, option b is correct.

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In terms of their polarity from most polar to least polar, the ranking will be:

The polarity of a solvent refers to its ability to dissolve polar or ionic compounds, with more polar solvents being better at dissolving polar compounds and less polar solvents being better at dissolving nonpolar compounds.

The polarity of a solvent can be estimated using various properties, including its dielectric constant, dipole moment, and hydrogen bonding ability.

From most polar to least polar, the solvents listed in the question can be ranked as follows:

Note that this ranking is based on general trends and should be considered a rough guide, as the polarity of solvents can vary depending on the specific conditions and interactions involved.

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When comparing two Lewis structures for the same molecule, one should look for the structure with minimized formal charges, lesser formal charges on individual atoms, a balanced distribution of formal charges, and consideration of electronegativity to determine which Lewis structure is more likely or preferred.

Minimized formal charges are where one should look for the Lewis structure that minimizes the overall sum of formal charges on the atoms. Structures with zero or near-zero formal charges on most atoms are usually more stable. One should compare the individual formal charges on atoms. Structures with smaller absolute values of formal charges (e.g., -1, 0, +1) are generally more favorable than structures with larger formal charges. If formal charges are evenly distributed, rather than concentrated on a single atom or localized region, the structure is typically more stable.

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