Once you found the object…. what would you do to avoid transferring the potential energy from the object and keep this bookshelf safe.

A tablet weighing 0.940 g was dissolved in dilute sulphuric acid made up to 250 cm³ with water. 25.0 cm³ of this solution was titrated with 0.00160 M K\(_2\)Cr\(_2\)O requiring 32.5 cm3 of the  K\(_2\)Cr\(_2\)O. 4.17% is the percentage by mass of  \(Fe^{2+}\) in the tablet.

Mass percent is a means to describe a component in a specific combination or to convey a concentration. The mass percentage used to describe the solution composition indicates the mass of solute contained in a given mass of solution. The solute's concentration is specified in terms of mass or moles.

6\(Fe^2+\) + \(Cr_2O_7^{2-}\) + 14\(H^+\) → 6\(Fe^{3+}\) + 2\(Cr^{3+}\)+ 7H\(_2\)O

32.5 cm³x 0.00160 M = 0.052 g of K\(_2\)Cr\(_2\)O\(_7\)

0.052 g / 294.18 g/mol = 0.000177moles of K\(_2\)Cr\(_2\)O

0.000177 mol / 6 = 0.0000295 mol moles of \(Fe^{2+}\)

0.0000295 mol / 0.025 L = 0.00118 M  of  \(Fe^{2+}\)

0.00118 M x 55.845 g/mol x 0.025 L = 0.0392 g of  \(Fe^{2+}\)

0.0392 g / 0.940 g x 100% = 4.17% percentage by mass of  \(Fe^{2+}\)

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NaOH is known to be adeliquescent substance, so it has to be standardized using KHP before used for analysis.

A primary standard is a substance whose standard solution can be prepared using the solid. Such a substance must be pure and non-deliquescent.

Since NaOH is a deliquescent substance, it must therefore always be standardized using KHP before used for analysis.

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Answer:

the answer is the third figure from left

Brainly is erroneously blocking my answer from being posted due to nonexistent profanity and/or links, so I have attached an image of my written response. Please let me know if you have any problems seeing it.

a.)  The Volume of water displaced is  3 ml

b.)  The final density of the mineral is 4.1 g/ml.

(a) The volume of water displaced is the ratio of the volume containing mineral to the volume excluding mineral.

Volume of water displaced = Volume with mineral - Volume without mineral

Volume of water displaced = 53 ml - 50 ml

Volume of water displaced = 3 ml.

(b) The following formula can be used to determine the mineral's density:

Mass / Volume equals density.

The difference between the mass of the mineral and the mass without the mineral is the mass of the mineral.

Mass of mineral = Mass with mineral - Mass without mineral

Mass of mineral = 12.3 g - 0 g (since the mass without mineral is not given)

Mass of mineral = 12.3 g

By deducting the volume without the mineral from the volume with, one may determine the volume of the mineral.

Volume of mineral = Volume with mineral - Volume without mineral

Volume of mineral = 53 ml - 50 ml

Volume of mineral = 3 ml

Therefore, the density of the mineral is:

Density = Mass of mineral / Volume of mineral

Density = 12.3 g / 3 ml

Density = 4.1 g/ml

Therefore, the final density of the mineral is 4.1 g/ml.

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The radioactive atom in this sample has a half-life of about 138.6 minutes.

The half-life of a radioactive isotope is the time required for half of the atoms in a sample to decay. The half-life of an isotope depends on its specific decay rate, which is determined by its nuclear properties.

In this case, the sample of radioactive isotopes decays from 200 grams to 50 grams over a period of 60 minutes. We can use this information to calculate the half-life of the isotope using the following equation:

N = N₀ x \((1/2)^(t/T)\)

where N is the final amount of the isotope (50 grams), N₀ is the initial amount of the isotope (200 grams), t is the time elapsed (60 minutes), and T is the half-life of the isotope (in minutes).

Substituting the given values into the equation, we get:

50 = 200 x \(1/2^{(60/T)}\)

Dividing both sides by 200 and taking the natural logarithm of both sides, we get:

ln(1/4) = -60/T

Solving for T, we get:

T = -60 / ln(1/4) ≈ 138.6 minutes

Therefore, the half-life of the radioactive isotope in this sample is approximately 138.6 minutes.

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The minimum frequency of light required to ionize boron is approximately 2.01 x 10^15 Hz.

To find the minimum frequency of light required to ionize boron, we can use the equation E = hf, where E is the energy required to ionize boron and f is the frequency of light.

Given that the energy required to ionize boron is 801 kJ/mol, we can convert this to joules by multiplying by the conversion factor 1000 J/1 kJ and dividing by Avogadro's number (6.022 x 10^23 mol^-1) to get the energy per atom.

801 kJ/mol * (1000 J/1 kJ) / (6.022 x 10^23 mol^-1) = 1.33 x 10^-18 J

Now, we can rearrange the equation to solve for the frequency of light:

f = E / h

Substituting the values:

f = (1.33 x 10^-18 J) / (6.626 x 10^-34 J·s) = 2.01 x 10^15 Hz

Therefore, the minimum frequency of light required to ionize boron is approximately 2.01 x 10^15 Hz.

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Ionization energy is the energy required to remove an electron from an atom or ion in its ground state. It is often expressed in units of joules (J) or kilojoules per mole (kJ/mol).  2.01 x 10¹⁵ Hz is the minimum frequency of light is required to ionize boron

Ionization energy per atom

= ionization energy per mole/Avogadro's number

= 801/6.022 x 10²³

= 1.330 x 10⁻²¹ kJ = 1.330 x 10⁻¹⁸ J

Photon energy E = hf

where h is the Planck constant and f is the frequency

Photon energy = ionization energy per atom

E=hf = 1.330 x 10⁻¹⁸

Frequency f = 1.330 x 10⁻¹⁸/6.626 x 10⁻³⁴

= 2.01 x 10¹⁵ Hz

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Answer:

n=mass/molar mass

mass=?,molar mass=12+(35.5)4=154g/mol.n=4.63x10²

mass=4.63x10²x154=7128g

Answer:

when we do increased activity our body requires more energy and therefore more oxygen and

therefore heart has to pump blood much faster and that's why increase heart rate

Answer:

do some jumping activity and other exercises

Explanation:

hope it helps

According to molar concentration, the molarity of a solution containing 20.1 grams of CaCO₃ in 2.0 L of water is 0.1004 M.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molarity=mass/ molar mass ×1/volume of solution in liters.Substitution of values in formula gives molarity= 20.1/100.08×1/2=0.1004 M.

Thus, the molarity of a solution containing 20.1 grams of CaCO₃ in 2.0 L of water is 0.1004 M.

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Your question is incomplete,but most probably your full question was, a solution contains 20.1 grams of CaCO₃ in 2.0 L of water.What is it's molarity?

The protons and neutrons that make up the atom's nucleus account for the majority of the atom's mass according to the Bohr model.

The Bohr model, also known as the Rutherford-Bohr model, was first proposed by Niels Bohr and Ernest Rutherford in 1913. It is a system made up of an orbiting nucleus that is compact and dense, surrounded by electrons, much like the Solar System.

Bohr was the first to realise that electrons move in various orbits around the nucleus and that the quantity of electrons in an element's outer orbit determines its properties.

In the Bohr model of the atom, the protons and neutrons that make up the nucleus are responsible for most of the atom's mass. The negatively charged electrons orbit the positively charged core, making up a small portion of the mass but being electrically comparable to the protons in the nucleus.

Therefore, the correct answer is option a. in specific, allowed orbits.

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Answer:

WHY DO YOU NEED HELP HUH

DON'T CHEAT READ AND STUDY

Explanation:

Answer:

It's C

Explanation:

Answer:

0.44 moles Molar Mass = 28.496

Explanation:

1.3(8.2)=n(0.0821)(23+273)

PV=nRT

12.5/0.43865

Answer:

Sulfur and Nitrogen

Explanation:

Molecular compounds are formed mostly when nonmetals combine. Usually electrons are shared between atoms in the covalent bond.

Sulphur and nitrogen are nonmetals whose difference in electronegativity is not much. Hence they form a molecular compound.

Answer:

D because electron is negatively charge around the nucleus

electrons are found outside the nucleus

An atoms is composed of electrons, protons and neutrons. Protons and neutrons are attached within the nucleus whereas electrons are in the cloud around the nucleus. Thus, option D is correct.

Atoms are the basic units of every substance. Atoms are composed of subatomic particles electrons, neutrons and protons.  Protons and neutrons are located inside the nucleus where as electrons are revolving around the nucleus.

The core of an atom is called nucleus. The protons are positively charged and the neutrons are neutral. Electrons are negatively charged particles and they are revolving around the nucleus through circular paths of fixed energy called orbits.

The region where we can find an electron inside an atom is called an orbital. Electrons experience an attractive pull  from the positively charged nucleus and thus electrons are existing in a cloud of electrostatic force around nucleus.  

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Answer:

10 atm

Explanation:

There's a lot to do here, but lets take it one step at a time. First, let's write a balanced equation for the decomposition of potassium chlorate into potassium chloride and oxgyen gas.

2 KClO3 → 2 KCl + 3 O2

Now let's find the moles of the KClO3 (molar mass 122.55 g/mol) that we have take 10 g/122.55 g/mol, grams will cancel and we are left with 0.0816 moles. lets divide that by two since we have a two in front of the KClO3 in the equation, and then multiply that number by 5 since it's the total moles of products, in summary, multiply by 5/2 to get 0.204 moles.

Now that we know the moles of our products, let's plug some stuff into the ideal gas law PV = nRT. We are looking for P so let's solve for that. P = (nRT)/V, now let's plug in our values. Make sure V is converted to liters so 0.5 L. And convert celcius to kelvin by adding 273

P = ((0.204 moles)(318 K)(0.08206 L atm mol^-1 K^-1))/0.5 L

A lot of units cancel, and we get about 10.65 atm, if you don't want the answer in atm, you can find a conversion equation. But let's round to sig figs for now, which will bring us to 10 atm.

Answer:

C distance from gold nuclei

Answer:

Explanation:

The distance covered by an object given it's velocity and time taken can be found by using the formula

From the question

velocity = 290 miles/hour

time = 3 hours

The distance between the two cities is

distance = 290 × 3

We have the final answer as

Hope this helps you

Answer:

injury

Explanation:

because get hurt we can say injury

Answer:

3500000 try this i think it's right not sure

Explanation:

Calories are used to define the unit of energy given by the consumed food in the body. A dinner containing 3.5x10⁶ joules has calories of 836.52 Cal.

Calories have been defined as the amount of energy given by the food and its various components, including carbohydrates, proteins, fats, fibers, etc. The stored calories more than the use of those calories results in their storage in the adipose tissues which may lead to obesity.

The food energy from joules can be converted into large calories (Cal) as it is the required amount to raise 1°C of the temperature of a 1 kg substance at 1 atm pressure.

The conversion is done as:

1 J = 0.000239 Cal

3500000 joules = 836.520 Cal

Therefore, the energy of dinner in calories is 836.520 Cal.

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Answer:

Conduction

Explanation:

Conduction can be regarded as transfer of thermal energy which exist

between two or more objects that are in contact with each other. From the question, the spoon touches the hot liquid and heat is transferred to the spoon through conduction

Answer:

The mass percentage of iron in \(\rm K_3[Fe(CN)_6]\)  (potassium ferricyanide) is approximately \(17\%\).

Explanation:

Start by finding the formula mass of potassium ferricyanide, \(\rm K_3[Fe(CN)_6]\), using relative atomic mass data from the question:

\(\begin{aligned} & M(\mathrm{K_3[Fe(CN)_6]}) \\ &\approx 3 \times 39 + 56 + 6 \times (12 + 14) \\ &= \rm 329 \; g \cdot mol^{-1}\end{aligned}\).

In other words, every one mole of \(\rm K_3[Fe(CN)_6]\) formula units have a mass of approximately \(329\; \rm g\).

On the other hand, note that there is one iron \(\rm Fe\) atom in every one mole of \(\rm K_3[Fe(CN)_6]\) formula units. Hence, there would be exactly one mole of iron atoms in every one mole of \(\rm K_3[Fe(CN)_6]\) formula units. The mass of that one mole of iron atoms is approximately \(56\; \rm g\) (again, from the relative atomic mass data of the question.)

Therefore:

\(\begin{aligned}& \text{Mass percentage of $\mathrm{Fe}$ in $\mathrm{K_3[Fe(CN)_6]}$} \\ &= \frac{\text{Mass of $\mathrm{Fe}$ in one mole of $\mathrm{K_3[Fe(CN)_6]}$ formula units}}{\text{Mass of one mole of $\mathrm{K_3[Fe(CN)_6]}$ formula units}}\times 100\% \\ &= \frac{M(\mathrm{Fe}) \times (\text{Number of $\mathrm{Fe}$ atoms in each $\mathrm{K_3[Fe(CN)_6]}$ formula unit)}}{M(\mathrm{K_3[Fe(CN)_6]})} \times 100\%\end{aligned}\)

\(\begin{aligned}&\approx \frac{1 \times 56\; \rm g \cdot mol^{-1}}{329\; \rm g \cdot mol^{-1}}\end{aligned}\).

the answer is letter "d"

Explanation:

bcoz the change of shape doesn't involve chemical reactions...

d

dont have to explain

ok mark pls pls pls pls pls

Answer: Sterilization

Explanation:

The pipette needs to be sterile so that nothing interferes with the DNA sample.

Answer:28.411

Explanation: f1 m1+ f2 m2+ f3 m3

0.6628(28)+0.2634(29)+0.0738(30)=28.411

remember that for percentages you divide the number by 100 to get the decimal form.

In a first-order reaction, it takes 23.02 days for 68 percent of the chemical to be destroyed.

Given,

fee constant for the destruction of pollutant = 0.1/day

We ought to discover the number of days it'll take for sixty eight percent of the chemical to be destroyed.

[A] = [A]₀e^⁻kt

in which [A] is the present awareness, and

[A]₀ is the initial awareness

k is the price of decrement

[A]₀ = 1

[A] = 0.1

Or, t =㏑(10)/k

Or, t = 2.302/zero.1

Or, t = 23.02 days.

for this reason the wide variety of days required for the destruction of sixty eight percent of chemicals is 23 days.

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Answer:

Solution given:

2 Al + 3 H2SO4 – Al2(SO4)3 + 3H2

2mole +3mole. --- 1 mole + 3 mole

27×2g. +3×98g-------- 342,g. + 6g

we have

2 mole of Al gives. 6g of h2

5 moles of Al gives 6/2×5=15g of hydrogen

15 g is your answer