A force of 6 N is applied to a ball for 2 s. What is the impulse?

Answer:

0.00001 M

Explanation:

The pOH of a solution is defined as the negative logarithm of the hydroxide ion concentration:

pOH = -log[OH-]

Therefore, we can rearrange this equation to solve for [OH-]:

[OH-] = 10^(-pOH)

If the pOH of a solution is 5.0, then:

[OH-] = 10^(-5.0)

[OH-] = 1.0 x 10^(-5.0)

[OH-] = 0.00001

Therefore, the hydroxide ion concentration of the solution is 0.00001 M.

Evaporation followed by distillation is a physical process that  would allow you to isolate this salt after the acid-base titration occurs in solution.

Acids are defined as substances which on dissociation yield H+ ions , and these substances are sour in taste. Compounds  such as HCl, H₂SO₄ and HNO₃ are acids as they yield H+ ions on dissociation.

According to the number of H+ ions which are generated on dissociation acids are classified as mono-protic , di-protic ,tri-protic and polyprotic  acids  depending on the number of protons which are liberated on dissociation.They are separated by distillation.

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A student wants to know if the effect of gravity is the same on all objects. The next step should be she choose new balls. Therefore, option A is correct.

The force that pulls items toward the center of a planet or other entity is called gravity. All the planets are kept in orbit around the sun by gravity.

All objects with mass, including our Earth, really bend and curve spacetime, which is what causes gravity to pull you toward the ground. What you experience as gravity is that curvature.

The force holding the gases in the sun is just one illustration of the gravitational field. the power behind a ball's descent after being thrown into the air. the force that makes an automobile coast downhill even when the gas is not depressed.

Thus, option A is correct.

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Answer:

prorobly because of your body hairs

Explanation:

Answer:

electrons

Explanation:

Tape has extra electrons and is also a negative charge. Your skin has positive charge so opposites attract.

The concept molarity is an important method which is used to calculate the concentration of a solution. It is mainly employed to calculate the concentration of a binary solution. Here the volume of  barium hydroxide is 21.28 mL.

Molarity of a solution is defined as the number of moles of the solute present per litre of the solution. It is represented as 'M' and its unit is mol/L.

The equation connecting molarity and volume of two solution is given as:

M₁V₁ = M₂V₂

V₁  = M₂V₂ / M₁

0.1002 × 25.00 / 0.1177 = 21.28 mL

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while zinc is an important mineral with numerous functions in the body, it is not true that grains are the most reliable food source of zinc. A balanced diet that includes a variety of foods can provide adequate zinc intake for most people.

How to solve the problem?

The statement that is NOT true of zinc is "Grains are the most reliable food sources of zinc." While grains can be a source of zinc, they are not necessarily the most reliable source.

Zinc is an essential mineral that plays important roles in many biological processes, including immune function, protein synthesis, wound healing, and DNA synthesis. It is involved in various enzymatic reactions, and acts as a cofactor for many enzymes. Zinc is also important for proper growth and development, especially during childhood and adolescence.

Excess zinc intake can lead to decreased copper absorption, as both minerals compete for absorption in the intestines. This can lead to copper deficiency, which can cause anemia neutropenia, and other health problems. Therefore, it is important to maintain a balance between zinc and copper intake.

While grains can be a source of zinc, other foods such as meat, seafood, and dairy products are also good sources. Vegetarians and vegans may need to pay particular attention to their zinc intake, as plant-based sources of zinc may be less bioavailable than -based sources. Zinc supplements can also be used to prevent or treat deficiencies, but should be used with caution as excessive intake can have negative health effects.

In summary, while zinc is an important mineral with numerous functions in the body, it is not true that grains are the most reliable food source of zinc. A balanced diet that includes a variety of foods can provide adequate zinc intake for most people.

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The indium has only two naturally occurring isotopes. The mass of the indium-113 is 112.9041 amu and the mass of indium-115 is 114.9039 amu. The  relative abundance of indium-115 is 57 %.

The average atomic mass is given as follows :

Average Atomic Mass = ∑(Relative Abundance × Mass)

The mass of indium-113 = 112.9041 amu

The mass of indium-115 = 114.9039 amu

Relative abundance for indium-113 =x

Relative abundance for indium-115 = (1-x)

x(112.9041) + (1 - x)(114.9039) = 114.818

x = 0.043 = 4.3 %

Relative abundance for indium-113 = 4.3 %

Relative abundance for indium-115 = 1 - 0.43

                                                         = 0.57 = 57 %

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Answer:

ptic fiber communication and satellite communication are the leading technologies which are revolutionizing the world of telecommunications. Both technologies have their advantages and limitations which make them suitable for certain type of applications. This article will provide an overview of optic fiber and satellite communication technologies and present a comparison of the features and related issues.

Optic Fiber Communication

Optic Fiber communication transmits information by sending pulses of light (using laser) through an optic fiber. The low signal loss in optic fibers and high data rate of transmission systems, allow signals with high data rates (exceeding several Gbps) to travel over long distances (more than 100 km) without a need of repeater or amplifier. Moreover, using wavelength division multiplexing (WDM) allows a single fiber to carry multiple signals (upto 10 different signals) of multi-Gbps transmissions. Optic Fiber communication offers extremely high bandwidth, immunity to electromagnetic interference, non-existent delays and immunity from interception by external means. In the 1980s and 1990s, the continents were linked together using undersea optic fiber bringing about a paradigm shift in the global telecommunications.

These advancements in optic fiber communication has resulted in decrease of satellite communications for several types of communications. For instance, transmission between fixed locations or point-to-point communications, where large bandwidths are required (such as transoceanic telephone systems) are made through optic fiber instead of using satellite communication. Optic Fiber communication is also used to transmit telephone signals, Internet communication, LAN (Gigabit LAN) and cable television signals.

Satellite Communication

Satellite communications use artificial satellites as relays between a transmitter and a receiver at different locations on Earth. Satellite systems allow users to bypass typical carrier offices and to broadcast information to multiple locations. Communications satellites are used for radio, TV, telephone, Internet, military and other applications. There are more than 2,000 satellites around Earth’s orbit, being used for communication by both government and private organizations.

Communication Satellites are LOS (line-of-sight) microwave systems with a repeater. These satellites rotate around the earth with the speed of earth and are known as geostationary satellites. The limitations of antenna size also limits focusing capability making the coverage for a single satellite transmitter very large. This makes satellite communication ideal for TV and radio services as the signal has to flow from a single point to many points in a single direction. The large distance of satellites from the earth (about 22,300 miles) results in delays which adversely effects two-way communication like mobile conversations. Low earth orbit satellites can be used for two-way mobile communication because less power is required to reach those satellites.

Explanation:

The arrow in a chemical equation represents the direction of the reaction. It indicates the conversion of reactants into products. The arrow points from the reactant side to the product side, symbolizing the flow of the reaction.

The purpose of the arrow is to visually represent the chemical transformation occurring in the reaction. It shows the relationship between the reactants and products and the direction in which the reaction proceeds. The arrow implies that the reactant molecules are being rearranged and transformed into new substances with different properties.

Chemical equations are used to describe the stoichiometry and balance of reactions. The arrow helps convey this information by illustrating the overall process taking place. It serves as a crucial element in understanding the reaction's composition, reaction conditions, and the substances involved.

Furthermore, the arrow also implies that the reaction can occur in both directions. In reversible reactions, the arrow can be represented as a double-headed arrow, indicating that the reaction can proceed in either direction depending on the conditions.

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The number of moles of ammonia, NH₃ needed to react with 3 moles of phosphoric acid, H₃PO₄ is 9 moles

We'll begin by writing the balanced equation for the reaction. THis is illustratd below:

H₃PO₄ + 3NH₃ --> (NH₄)₃PO₄

From the balanced equation above,

1 mole of H₃PO₄ reacted with 3 moles of NH₃

From the balanced equation above,

1 mole of H₃PO₄ reacted with 3 moles of NH₃

Therefore,

3 moles of H₃PO₄ will react with = 3 × 3 = 9 moles of NH₃

Thus, 9 moles of NH₃ is needed for the reaction

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Answer:

6

Explanation:

Answer:

5ML

Explanation:

Neutral litmus paper is usually purple. however in this case the neutral color seems to be yellow. Litmus can also be prepared as an aqueous solution that functions similarly. Under acidic conditions, the solution is red, and under alkaline conditions, the solution is blue.

Answer:

in the water, plants and small organisms like plankton take up mercury through passive surface absorption or through food intake. ... Methylmercury biomagnifies through the food chain as predators eat other organisms and absorb the contaminants that their food sources contained.

Explanation:n the water, plants and small organisms like plankton take up mercury through passive surface absorption or through food intake. ... Methylmercury biomagnifies through the food chain as predators eat other organisms and absorb the contaminants that their food sources contained.

Plants and small organisms like plankton absorb mercury in the water via passive surface absorption or food intake. Methylmercury biomagnifies through the food chain as predators consume other organisms and absorb contaminants from their prey.

Biomagnification is the condition in which the chemical concentration in an organism exceeds the concentration of its food when the organism's diet is the primary exposure route.

Any concentration of a toxin, such as pesticides, in the tissues of tolerant species at increasingly higher levels in a food chain is referred to as biomagnification. One example of biomagnification in action is the accumulation of the insecticide DDT in zooplankton.

Mercury is taken up by water, plants, and small organisms such as plankton via passive surface absorption or food intake. Methylmercury biomagnifies through the food chain as predators consume other organisms and absorb contaminants from their prey.

Thus,  Methylmercury biomagnifies through the food chain as predators consume other organisms and absorb contaminants from their prey.

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To find the density of the unknown piece of metal, we can use the formula:

Density = mass / volume.

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Answer:

A & B

Explanation:

Done the Quiz

CaO+CO2=CaCO3 balance the chemical equation. Calcium oxide+carbon dioxide=calcium carbonate.

Steel, mining, paper, sewage systems and purification, and the production of plastics all use calcium oxide, which is inferred from limestone. Lime is widely used in agriculture and glass manufacturing. Calcium and magnesium content are increased while the acidity of the soil is stabilised by adding limestone.

Although there are some freshwater limestones as well, organisms in seawater almost exclusively produce limestone, either directly by the crystallisation of dissolved calcium and carbonate to form shells or as a byproduct of the organisms' presence in the seawater (which can alter the overall geochemical setting).

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Answer:

0.02kg

Explanation:

Given parameters:

Amount of heat  = 5200J

Unknown:

Mass of ice that would be melted at 0°C = ?

Solution:

To solve this problem, use the expression below;

        H  = mL

H is the heat

m is the mass

L is the latent heat of fusion of ice  =  3.33 x 10⁵ J/kg.

 Insert the parameters and solve for m;

           5200  = m x 3.3 x 10⁵

             m  = \(\frac{5200}{3.33 x 10^{5} }\)   = 0.02kg

Answer: D. The equilibrium constant would change.

The equilibrium constant would change if the temperature were changed.

Hence, the correct option is D.

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Answer

29.3171 g KClO₃

Procedure

To solve this question consider the following chemical reaction:

2KClO₃→2KCl+3O₂

Then we will use the ideal gas formula to determine the number of moles present in 6.75 L of oxygen gas.

Data:

V=6.75 L

T= 298 °K

P= 1.3 atm

R= 0.08206 L⋅atm⋅°K⁻¹⋅mol⁻¹

Equation

PV=nRT

Solve for n to get the moles

Use the stoichiometry of the reaction to convert from moles of oxygen to moles of KClO₃.

Finally, convert from moles to grams

The mass of oxygen in 4 moles of C2H4O2 is 128g.

The mass of a substance can be calculated by multiplying the number of moles of the substance by its molar mass.

Molar mass of C2H4O2 = 12(2) + 1(4) + 16(2) = 60g/mol

mass of C2H4O2 = 60g/mol × 4 moles = 240grams

However, the mass of oxygen in the compound can be calculated as follows:

molar mass of oxygen/molar mass of compound × 240 grams

32g/mol ÷ 60g/mol × 240g

= 128g

Therefore, the mass of oxygen in 4 moles of C2H4O2 is 128g.

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The scratched tin can with the iron will more rapidly corrode the iron than the tin.

The corrosion can be given as the process of the oxidation of the metal into the more stable metal oxide. The chemical oxidation of the metal is attained with the surrounding available oxygen or the water vapors.

The reactivity of the Iron for the oxidation is more as compared to the tin from the reactivity series. Therefore if both tin and iron are exposed to corrosion, iron will be more rapidly corroded.

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The concentration of NaOH in molarity is calculated to be equal to 2.186 M.

Concentration of chemical substance expresses the amount of substance present in any mixture.

In a neutralization reaction between NaOH and HCl, the number of moles of HCl will be equal to the number of moles of NaOH.

n(NaOH) = n(HCl)

n is the number of moles.

n(HCl) = M(HCl) x V(HCl)

M is the molarity and V is the volume in liters.

n(HCl) = 0.65 M x 0.037 L = 0.02405 moles HCl

Since the number of moles of NaOH is the same as the number of moles of HCl, we can use the following formula to find the concentration of NaOH:

M(NaOH) = n(NaOH) / V(NaOH)

V(NaOH) = 11.0 mL / 1000 mL/L = 0.011 L

M(NaOH) = n(NaOH) / V(NaOH) = n(HCl) / V(NaOH)

M(NaOH) = 0.02405 moles / 0.011 L = 2.186 M

Therefore, the concentration of NaOH in molarity is 2.186 M.

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The process of cellular respiration releases energy because the energy that is released when the bonds are formed in CO\(_2\) and water is equal to the energy required to break the bonds of sugar and oxygen. Therefore, the correct option is option A.

Cells turn sugars into energy through a process called cellular respiration. Cells need fuel or an electron acceptor to power the chemical process that converts energy into usable forms such as ATP along with additional kinds of energy that can be utilised to power cellular reactions.

All multicellular species, including eukaryotes, as well as certain single-celled organisms, generate energy by aerobic respiration. Utilising oxygen, which is the strongest electron acceptor found in nature, is called aerobic respiration. The process of cellular respiration releases energy because the energy that is released when the bonds are formed in CO\(_2\) and water is equal to the energy required to break the bonds of sugar and oxygen.

Therefore, the correct option is option A.

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250 L of 5.0% w/v glucose solution can be prepared using 125 g of glucose.

w/v = [ mass of solute (g) / volume of solution (mL) ] × 100

5.0 % w/v = [ 125 g / volume of solution (mL) ] × 100

volume of solution (mL) = [ 125 g / 5.0 % w/v ] x 100

volume of solution (mL) = [ 125 g / (5.0 / 100) ] x 100

volume of solution (mL) = [ 125 g / 0.05 ] x 100

The boiling point of benzene when the external pressure is 440 torr is 80.1 °C (176.2 °F).

What is benzene?

Benzene is an organic compound composed of six carbon atoms in a ring structure, with one hydrogen atom attached to each carbon atom. It is a highly flammable, colorless liquid with a sweet smell. Benzene is a natural component of crude oil and is one of the most important organic chemicals used in industry. It is used in the production of plastics, resins, synthetic fibers, rubber, pesticides, detergents, drugs, and dyes. It is also used as a solvent for fats, oils, waxes, resins, and inks. Benzene is classified as a carcinogen and its exposure can cause a variety of adverse health effects, including acute myelogenous leukemia, lymphomas, and other forms of cancer.

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Answer:

B

Explanation: