5. On a 92 point test, a student scored 87 points. What is their percent error?

Answer:

I'm not sure

Explanation:

I'm just not sure

Only the pair of solutions in option d will form a precipitate upon mixing.The pair of aqueous solutions that will form a precipitate upon mixing is d. NaCl and Pb(NO3)2.

This is because the combination of these two solutions will result in the formation of insoluble lead chloride (PbCl2) precipitate, which is white in color. The reaction that takes place is:
2NaCl (aq) + Pb(NO3)2 (aq) → 2NaNO3 (aq) + PbCl2 (s)
The other options, a. NH4Cl and NaBr, b. NaNO3 and AgC2H3O2, and c. CaCl2 and CsI do not result in the formation of a precipitate when mixed. When NH4Cl and NaBr are mixed, they will form a clear and colorless solution as both are highly soluble in water. Similarly, NaNO3 and AgC2H3O2 will also form a clear and colorless solution, as both are highly soluble in water. Finally, CaCl2 and CsI will form a clear and colorless solution as both salts are highly soluble in water. Therefore, only the pair of solutions in option d will form a precipitate upon mixing.

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The statement "the general chemical composition of various window glasses has been found to be relatively uniform among various manufacturers and therefore offers no basis for identifying individual samples" is True.

Glass is a commonly used material that is used in a wide range of applications, including window panes. The chemical composition of window glass is relatively constant among different manufacturers, according to research. Therefore, it does not provide a reliable method for identifying various glass samples based on their chemical composition.

The given statement "the general chemical composition of various window glasses has been found to be relatively uniform among various manufacturers and therefore offers no basis for identifying individual samples" is true, because the chemical composition of glass is constant, researchers employ alternative techniques to distinguish between various glass samples. Some of these techniques include the use of trace elements, the age of the glass, and other physical characteristics such as refractive index and density.

Therefore the given statement is true.

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Answer:

D. Stars is the correct answer

Please give my answer the brainliest...

Answer:

D. Energy is absorbed during the reaction; therefore, the temperature of the liquid will decrease

Explanation:

In a chemical reaction, the reaction is said to be ENDOTHERMIC if the reaction utilizes or uses energy instead of given it off. In this reaction, Jose adds five grams of a chemical to one liter of liquid and observes the reaction.

According to this question, the reaction is ENDOTHERMIC. This means that energy is absorbed or used up during the reaction; therefore, the temperature of the liquid will decrease i.e. the liquid used in the reaction will become COLDER.

The reaction you are referring to involves the use of NaOH (sodium hydroxide), H2O (water), and heat with a phenol compound that has a double bond to an oxygen (O) atom, which is an aromatic ketone. In this reaction, the major organic product obtained is a phenol.

The presence of a strong base, NaOH, and heat causes the ketone to undergo a base-catalyzed alpha-hydroxylation reaction. The hydroxide ion (OH-) from NaOH attacks the alpha-carbon, forming a carbanion intermediate. The carbanion then reacts with water, which acts as a nucleophile, to form an alpha-hydroxyketone.

Subsequently, the alpha-hydroxyketone undergoes a tautomeric shift, a type of isomerization reaction. The tautomeric shift involves the movement of a proton and the migration of a double bond to form a more stable compound. In this case, the keto form (aromatic ketone) converts into its enol form (phenol).

The phenol is the major organic product in this reaction due to the increased stability provided by the aromatic ring and the hydrogen bonding capabilities of the hydroxyl group.

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Answer:

V₂ = 5.97 L

Explanation:

Given data:

Initial temperature = 9°C (9+273 = 282 K)

Initial volume of gas  = 6.17 L

Final volume of gas = ?

Final temperature = standard = 273 K

Solution:

Formula:

The Charles Law will be apply to solve the given problem.

According to this law, 'the volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure'

Mathematical expression:

V₁/T₁ = V₂/T₂

V₁ = Initial volume

T₁ = Initial temperature

V₂ = Final volume  

T₂ = Final temperature

Now we will put the values in formula.

V₁/T₁ = V₂/T₂

V₂ = V₁T₂/T₁  

V₂ = 6.17 L ×  273K /  282  k

V₂ = 1684.41 L.K / 282 K

V₂ = 5.97 L

Based on the data provided, (a) the cubic crystal structure is FCC, (b) the lattice constant in Angstroms is 0.3615 and (c) the unknown element is Nickel.

Here is the solution:

The first peak at 2qA = 11.622558513411379 degrees corresponds to the (111) reflection, which is the most intense reflection for FCC crystals.

The second peak at 2qB = 13.428288268863643 degrees corresponds to the (200) reflection.

The Bragg equation is:

2d sin(θ) = λ

where d is the lattice spacing, θ is the scattering angle, and λ is the wavelength of the X-ray.

Solving for d, we get:

d = λ / 2 sin(θ)

Substituting the values for λ and θ, we get:

d = 0.71144 Å / 2 sin(11.622558513411379°)

≈ 0.3615 Å

The lattice constant for FCC Nickel is 0.3524 Å, which is very close to the calculated value of 0.3615 Å. Therefore, the unknown element is Nickel.

Thus, (a) the cubic crystal structure is FCC, (b) the lattice constant in Angstroms is 0.3615 and (c) the unknown element is Nickel.

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In the reaction between a monosaccharide and a ferric ion, The carbonyl carbon is oxidized to a carboxyl group, the cupric ion is reduced.

Chemical reactions often involve color changes, temperature changes, gas evolution, or precipitate formation. Simple examples of everyday reactions are digestion, combustion, and cooking. The definition of reaction is a reaction. An example of a reaction is someone stopping their car at a stop sign. noun. response to stimuli.

The five basic types of chemical reactions are combination, decomposition, single exchange, double exchange, and combustion. By analyzing the reactants and products of a particular reaction, we can classify them into one of these categories. Some responses fit into multiple categories. It is modeled after the old Italian reaction, the French response, derived from the medieval Latin response (nominative to react). It is a noun of action formed in Late Latin from the past participle stem of the Latin reader.

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In the given reaction:

Cu(s) + 2AgNO3(aq) → Cu(NO3)2(aq) + 2Ag(s)

Copper (Cu) is being oxidized, and silver (Ag) ions are being reduced.

To determine oxidation and reduction, we look at the changes in oxidation states (or oxidation numbers) of the elements involved in the reaction.

In this reaction, the oxidation state of copper (Cu) changes from 0 in its elemental form (Cu(s)) to +2 in the copper(II) nitrate compound (Cu(NO3)2(aq)). This indicates that copper has lost electrons and has been oxidized.

On the other hand, the silver ions (Ag⁺) in the silver nitrate solution (AgNO3(aq)) are being reduced. The silver ions have an oxidation state of +1 in the compound, but when they react with copper, they are reduced to elemental silver (Ag(s)) with an oxidation state of 0. This reduction process involves the gain of electrons.

Therefore, in the given reaction, copper is oxidized and silver ions are reduced.

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If 5.00g of Zn metal is completely consumed in an HCl solution to produce Zinc (III) chloride (ZnCl₂) and Hydrogen gas (H₂), 0.0764 moles of ZnCl₂ will be produced.

To find the number of moles of ZnCl₂ produced, it is required to calculating the number of moles of Zn consumed.

According to question:

Mass of zinc = 5.00 g

Molar mass of zinc = 65.38 g/mol

By using the molar mass of Zn, find the number of moles of Zn:

Number of moles of zinc = Mass of Zn ÷ Molar mass of Zn

= 5.00 g ÷ 65.38 g/mol

= 0.0764

The stoichiometric ratio of Zn and ZnCl₂ is 1:1, according to the balanced equation. As a result, the number of moles of ZnCl₂ produced will be 0.0763 mol.

Thus, 0.0764 moles of ZnCl₂ will be produced.

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The given question is incomplete, so the most probable complete question is,

Suppose 5.00g of Zn metal is completely consumed in an HCl solution to produce Zinc (III) chloride (ZnCl₂) and Hydrogen gas (H₂) according to the following reaction: Zn(s) + 2HCl(aq) --> ZnCl₂(aq) + H₂(g). How many moles of ZnCl₂?

Answer:

Hard water is water that has high mineral content, Soft water is free from dissolved salts of such metals as calcium, iron, or magnesium

Explanation:

Answer:

D

Explanation:

I may need a photo but D seemed the most logical

Ag (Silver) can reduce Br₂ (I) to Br- (aq)  but it cannot reduce I₂ (s) to I-(aq) because silver is a stronger oxidizing agent and I₂ can be reduced with the help of hydrogen Peroxide (H₂O₂).

In case of bromine-

The chlorine gains these electrons, so it is the oxidizing agent (becoming reduced to Cl– ions). The bromine has given electrons to the chlorine, so the bromide ions are the reducing agent (becoming oxidized to Br atoms, which form Br₂).

In case of Iodine-

HI to I2 is oxidation. The I– ion in HI loses an electron to become an I atom, which then joins with another I atom to form an I2 molecule. here oxidation takes place therefore Ag which is a oxidizing agent, can't help.

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Answer:

K is a group 1 element while Ne is a group 0 element

K is a good reducing agent while Ne is inert

K is metal while Ne is a gas

K has one valence electron while Ne has no valence electron

Explanation:

Answer:

See explanation

Explanation:

Ga is in group 13 hence it must loose three electrons to form Ga^3+ in order to achieve the noble gas configuration because it has three electrons on its outermost shell.

O is in group 16 hence it must accept two electrons in order to attain the noble gas configuration to form O^2- since oxygen has six electrons on its outermost shell.

Br in group 17 has seven electrons in its outermost shell hence it must form Br^- (gain one electron) in order to attain the noble gas configuration.

P in group 15 must accept three electrons and form P^3- in order to attain the noble gas configuration since it has five electrons on its outermost shell.

S is in group 16 hence it must accept two electrons in order to attain the noble gas configuration to form S^2- since sulphur has six electrons on its outermost shell.

Mg in group 2 has two electrons on its outermost shell and must loose both to attain the noble gas configuration forming Mg^2+.

Al is in group 13 hence it must loose three electrons to form Al^3+ in order to achieve the noble gas configuration because it has three electrons on its outermost shell.

Se is in group 16 hence it must accept two electrons in order to attain the noble gas configuration to form Se^2- since selenium has six electrons on its outermost shell.

Lithium is in group 1 and must loose its only outermost electron in order to attain the noble gas configuration to form Li^+.

Rb is in group 1 and must loose its only outermost electron in order to attain the noble gas configuration to form Rb^+.

As in group 15 must accept three electrons and form As^3- in order to attain the noble gas configuration since it has five electrons on its outermost shell.

I in group 17 has seven electrons in its outermost shell hence it must form I^- (gain one electron) in order to attain the noble gas configuration.

Answer:

There are three isotopes of silicons. They have masses numbers of 28, 29 and 30. The average amount of silicons is 28.086alum

Explanation:

I learned this in class three days ago so I hope this is helpful i'm in high school  ask me for help when ever you want Iĺl help you

Answer:

Zn(s)+2HCl(aq)→ZnCl2(aq)+H2(g)

Explanation:

The net reaction is Z n ( s ) + 2 H + ( a q ) → Z n 2 + ( a q ) + H 2 ( g ) The C l − ions are spectators - they don't change.

Yes, an electron cause an electromagnetic wave to vibrate.

One of the waves is propagated by simultaneous periodic variations of electric and magnetic field intensity and that includes radio waves, infrared, visible light, ultraviolet, X-rays, and gamma rays.

Electromagnetic waves are produced when something vibrates—an electric charge that moves back and forth.

When an electric charge vibrates, the electric field around it changes. Because the electric charge is in motion, it also has a magnetic field around it.

This magnetic field also changes as the charge vibrates.

Therefore, an electron causes an electromagnetic wave to vibrate.

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Standard fire hydrants should not be installed on water mains smaller than 6 inches in size.

Fire Hydrants and Branches:

1.     Gridironing of Public Water Mains: Whenever possible, gridironing of public water mains shall be planned so that not more than one fire hydrant will be installed on a six-inch (6″) diameter water main between intersecting mains, and not more than two (2) fire hydrants installed on an eight-inch (8″) diameter water main between intersecting mains.

2.     High Value Areas: In industrial, warehouse, institutional, shopping center, or other high value areas within or outside the principal business district, there shall be one or two (2) fire hydrants at each street intersection, depending upon the character of the area, with intermediate fire hydrants placed so that they are not over three hundred feet (300′) apart. In general, depending upon the area’s characteristics, the average area to be served by each fire hydrant shall be from eighty thousand (80,000) to ninety thousand (90,000) square feet.

3.     Residential Areas: In residential areas there shall be one fire hydrant installed at each street intersection with intermediate fire hydrants located so that said fire hydrants are spaced not over three hundred feet (300′) apart. In general, depending upon the area’s characteristics, the average area to be served by each fire hydrant shall not exceed one hundred ten thousand (110,000) square feet.

4.     Fire Hydrant Branches: Fire hydrant branches shall have a minimum diameter of six inches (6″). In all cases a valve shall be installed on each fire hydrant branch and in no case shall the valve be of smaller diameter than the fire hydrant branch. Branch valves shall be situated not less than eighteen inches (18″) or more than twenty-four inches (24″) from the branch feeder main.

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Answer:

t = 1800 s

Explanation:

Given data:

Velocity of bicycle = 10 m/s

Distance cover = 18 Km

Time taken = ?

Solution:

Distance cover = 18 Km (18km×1000m/1km=18000 m)

Formula:

Velocity = distance/ time

by putting values,

10 m/s = 18000 m/ t

t =  18000 m/ 10 m/s

t = 1800 s

Answer:

because battery have it's own voltage in it's composition

Answer:  the formula mass of calcium phosphate [Ca3(PO4)2] is 310.177 amu, so its molar mass is 310.177 g/mol. This is the mass of calcium phosphate that contains 6.022 × 1023 formula units.

Answer: 310.177

The chemical portion of neuron signal transmission is called neurotransmission.

This process involves the release of chemical messengers called neurotransmitters from the presynaptic neuron (the neuron sending the signal) into the synaptic cleft (the space between the presynaptic and postsynaptic neurons). The neurotransmitters then bind to receptors on the postsynaptic neuron (the neuron receiving the signal), causing a change in the electrical activity of the postsynaptic neuron.

This change in electrical activity can either excite or inhibit the postsynaptic neuron, leading to either an increase or decrease in the likelihood that the postsynaptic neuron will fire an action potential. Neurotransmission is a crucial component of neuronal communication and is involved in a wide range of physiological processes, including sensation, movement, cognition, and emotion.

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Answer:

78° C.

Explanation:

The final temperature of water is 81℃ , if it is allowed to cool from a temperature of 95  and  it releases heat of 1200J.

In the following question we will apply specific heat Capacity equation

q=mct Δt

q= 1200J   m= 20 g c= 4.186  T₁= 95 ℃

1200= 20 ✕4.186(95-T₂)

T₂=81℃

Hence, The water cools to 81℃ temperature

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Answer:

Work

Explanation:

Work is defined as the ability to use energy in one second and its SI unit is same as energy that is joule.

Work refers to the energy utilized to displace an object over a distance by an external force in one direction and in given time period which can be one second as well.

Hence, the correct answer is "work".