3. Students were measuring distances and found one to be 2.04 m. When they asked the teacher if their measurement was correct, the teacher said, “Actually, it is 2.16 m.” What is the percent error?

Answer:

Option D

Explanation:

As we know at

PV = nRT

at STP,

Pressure is  1 atm and temperature is 273 K

\(\frac{P_2}{P_1} = \frac{T_2}{T_1} \\P_2 = 1*(428 )/273\\P_2 = 1.567\)

Hence, option D is correct

2.5 X 10²⁴ atoms of copper is equivalent to 266.7g of Cu.

HOW TO CALCULATE MASS:

Therefore, 2.5 X 10²⁴ atoms of copper is equivalent to 266.7g of Cu.

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Answer:

Ag is both reduced and the oxidizing agent.

Explanation:

Ag is the answer for both

Cu + AgNO₃ → Ag + CuNO₃

Cu is a reducing agent, and AgNO3 is an oxidizing agent.

In a chemical process, an oxidizing agent, also known as an oxidant, obtains electrons and becomes reduced. The oxidizing agent often referred to as the electron acceptor, is typically in one of its higher oxidation states since it will receive electrons and be reduced.

In a chemical process, a reducing agent, also known as a reductant, loses electrons and is oxidized. The electron donor is a reducing substance, which is normally in one of its lower oxidation states. A reducing substance undergoes oxidation because of the redox reaction's electron loss.

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The following statements on HPLC modes are true is more polar compounds elute first in normal-phase HPLC (Option E).

The liquid chromatography (HPLC) is a technique in analytical chemistry employed for the separation, identification, and quantification of elements. It is considered a highly sensitive method, and it works by separating the components in a mixture with the assistance of a solvent under high pressure.

There are two modes of HPLC: Reversed-Phase HPLC (RP-HPLC) and Normal-Phase HPLC (NP-HPLC). In RP-HPLC, a nonpolar stationary phase, such as C18, is used, and polar solvents, such as water, are used as mobile phases. Polar stationary phases, such as silica gel, are used in NP-HPLC, while nonpolar solvents, such as hexane, are used as mobile phases.

More polar compounds have a greater affinity for the polar stationary phase than less polar compounds, which have a higher affinity for the nonpolar mobile phase in NP-HPLC. As a result, less polar compounds elute first in normal-phase HPLC.

Thus, the correct option is E.

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Answer:

2.66 · 10⁵

Explanation:

There are 1440 minutes in a day. Which means that there is 266400 minutes in 185 days. And in scientific notation it is: 2.66 · 10⁵.

Answer:

the food chain you mean

Explanation:

pollution than mosquitoes then alligators

The % concentration of vitamin C in the 250 ml sample of orange juice is 0.03%.

To calculate the % concentration of vitamin C, we need to divide the mass of vitamin C by the volume of the sample and multiply by 100. In this case, the mass of vitamin C is given as 75 mg. Since 1 ml is equal to 1 gram, we can convert the volume of the sample from ml to grams by dividing it by 1000. So, 250 ml is equal to 250/1000 = 0.25 g. Now we can calculate the % concentration using the formula:

% concentration = (mass of vitamin C / volume of sample) * 100

= (75 mg / 0.25 g) * 100

= 30%

The % concentration of vitamin C in the 250 ml sample of orange juice is 0.03%.

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If a geologist drips a small amount of vinegar (acetic acid) onto a sample of dolomite, fizzing will occur because carbon dioxide is produced.

Effervescence observes whenever any gas tried to escape out from an aqueous solution, that's why CO₂ show effervescence.

Reaction between dolomite and acetic acid will be represented as:

MgCO₃ + 2CH₃COOH → CO₂ + H₂O + Mg(CH₃COO)₂

From the above reaction it is clear that carbon dixide gas is produced by showing the effervescence and fizzing behavior.

Hence, option (2) is correct.

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Answer:

B

Explanation:

on edge2022

Answer:

i hope Boron oxide is the name you're looking for.

Answer:

See below

Explanation:

The common formula of the same alkene series is CnH2n, where n is the quantity of atoms of carbon. Owing to the hydrocarbons of alkenes with at least one double carbon relation, the alkene-like sequence starts with ethen C2H4.

Hope this helps.

The general formula for the homologous series which includes ethene is alkenes.

Alkenes

They are homologous series with the general formula CxH2x.

Where:

x = number of carbon atoms.

Examples are methene with one carbon atom: CH2

Ethene with 2 carbon atoms: C2H4

Propene with 3 carbon atoms: C3H6

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Answer:

22,600 J or 22.6 kJ

Explanation:

Answer:

100

Explanation:

Will autoionzation of water be spontaneous at high temperature

The elements shown have an atomic mass of 20 amu is Neon.

The atomic number of an atom is its total number of protons and neutrons.

Neon has an atomic mass of about 20 this isotope contains 10 protons and 10 neutrons.

Actually, Neon would be listed as having an atomic mass of about 20.18 because of a mixture of isotopes.

Z= Atomic number the number of protons in the nucleus which defines the element.

In this case,  Z=10 and this means neon but there are also 10 neurons in the nucleus of the major isotope which gives it 20Ne.

Hence, option D is the correct answer.

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Answer:

here u go! ................

Answer:

Hope this is ok :))

Explanation:

Answer:a)No of moles of Aluminium=0.4703

b)number of aluminum atoms=2.832 x 10^23 atoms

Explanation:

a)Given that The Amount/ Mass of Aluminum is 12.69g

We know that

No of moles =Mass/ Molar mass

Molar mass of Aluminium, Al is 26.982 g/mol

No of moles =12.69g/26.982 g/mol

No of moles =0.4703

Also

b) 1  mole of aluminium must contain  6.022  x 10^23  atoms of aluminium  

which is  known as Avogadro's constant.

Therefore, 0.4703 moles will contain 0.4703 x  6.022  x 10^23  atoms =2.832 x 10^23 atoms

Answer:

Sam used 16 gallons of paint to paint the entire barn.

Explanation:

1 quart = 0.25 of gallon

38 + 26 = 64

64 / 0.25 = 16

16 gallons.

Answer:

the S Block and the P Block

NO D or F Block

Explanation:

take a phtocopy oa a periodic table.

fold it so the IIA column touches the IIIA column

all of these elements now shown are "representative"

The chemical reaction involves when aqueous solution of potassium iodide and silver nitrate are mixed is,

KI (aq.) + AgNO3 (aq.) ----> KNO3 (aq.) + Ag I (s)  

Net ionic equation,

Ag+(aq.) + I- (aq.) ----> Ag I (s)

complete Ionic equation,

K+ + I- + Ag+  + NO3-  ----> K+  + NO3- + Ag I (s)

The Precipitation reaction is the reaction in which dissolved substances react to form one or more solid products. Many reactions of this type involve the exchange of ions between ionic compounds in aqueous solution. This reactions occur when cations and anions in aqueous solution combine to form an insoluble ionic solid called a precipitate. The ability to predict these reactions allows scientists to determine which ions are present in a solution and allows industries to form chemicals by extracting components from these reactions.

When aqueous solutions of ammonium phosphate and sodium sulfate are mixed. No reaction forms.

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Answer:

volume problem

Explanation:

cubic usually means volume

Answer:

proton-27

electron-25

neutron-35

Explanation:

At rest, K+ concentrations are higher inside neurons. K+ has the propensity to migrate out of the neuron down the concentration gradient because it can freely pass the neuronal membrane.

The inside of the cell contains more potassium ions than the outside does. The system as a whole is electrically neutral because an anion balances out each potassium ion (on either side of the membrane). As a result, there is a high concentration of sodium ions outside the cell and a high concentration of potassium ions inside. Additionally, the neuronal membrane contains specialized proteins known as channels that create gaps in the membrane that are only permeable to certain ions.

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Answer:

The length of the log is 180 cm

Explanation:

From the question given above, the following data were obtained:

Time = 2 hours

Speed = 1.5 cm/min

Distance =?

Next, we shall convert 2 hours to minutes. This can be obtained as follow:

1 h = 60 mins

Therefore,

2 h = 2 × 60

2 h = 120 mins

Finally, we shall determine the Lenght of the log. This can be obtained as follow:

Time = 120 mins

Speed = 1.5 cm/min

Distance =?

Speed = distance / time

15 = distance / 120

Cross multiply

Distance = 1.5 × 120

Distance = 180 cm

Therefore, the length of the log is 180 cm

Answer:

180

Explanation:

The red color is emitted when electrons in the gas return to ground state.

From the Bohr model, we know that an electron in atom could be found in its lowest energy state. The electron could receive energy in this lowest energy state and move to a higher energy state called the excited sate. The lower energy state that the electron was at the first is called the ground state of the electron.

As the electrons return to ground states, photons of light of a characteristic wavelength is emitted. The color of the light shows the wavelength of the light emitted.

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Answer:

sorry I don't know the answer hope you understand

Answer:

\(density \: = \frac{mass}{volume} \\ density = \frac{16212}{840} \\ = 19.3g {cm}^{ - 3} \)

Since the density is 19.3g/cm^3, then the substance is gold.

Explanation:

Hope that this is helpful.

Have a great day.

A calcium ion concentration of 400 ppm is equivalent to 4% when expressed as a percentage.

To convert the calcium ion concentration from parts per million (ppm) to a percentage, we need to divide the concentration by 10,000. The reason for this is that parts per million represents the number of parts of the substance per million parts of the solution.

Given:

Calcium ion concentration = 400 ppm

Calcium ion concentration (as a percentage) = (400 ppm / 10,000) * 100

Calcium ion concentration (as a percentage) = 4%

Therefore, a calcium ion concentration of 400 ppm is equivalent to 4% when expressed as a percentage.

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