When performing a multiplication or division calculation, significant figures in the calculated result are dictated by the _____ of the measured numbers.
The calculated result should have ______ the measured number in the calculation with the fewest _______.

Approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.

To determine the number of molecules of HCl required to form 34.52 g of MgCl₂, we need to use the molar mass and stoichiometry of the balanced equation:

Mg(OH)₂(s) + 2 HCl(aq) → 2 H₂O(l) + MgCl₂(aq)

The molar mass of MgCl₂ is 95.21 g/mol.

First, we need to calculate the number of moles of MgCl₂ formed:

Moles of MgCl₂ = mass of MgCl₂ / molar mass of MgCl₂

Moles of MgCl₂ = 34.52 g / 95.21 g/mol

Moles of MgCl₂ = 0.363 mol

According to the balanced equation, the stoichiometric ratio between HCl and MgCl₂ is 2:1. Therefore, the moles of HCl required can be calculated as follows:

Moles of HCl = 2 * Moles of MgCl₂

Moles of HCl = 2 * 0.363 mol

Moles of HCl = 0.726 mol

To calculate the number of molecules, we need to use Avogadro's number, which is approximately 6.022 x 10^23 molecules/mol.

Number of molecules of HCl = Moles of HCl * Avogadro's number

Number of molecules of HCl = 0.726 mol * 6.022 x 10^23 molecules/mol

Number of molecules of HCl = 4.37 x 10^23 molecules

Therefore, approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.

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Answer:

Energy is never lost, it just changes from one form to another

Answer:

Budding in yeast is primarily a biological process

The sum is given as 27.258 +40.13 =   67.39

The term significant figures refers to the number of nonzero values in a digit. It refers to the number of figures that we could assign a place value in a given measurement.

We can see that in the number 27.258, there are five significant figures while in the number 40.13 there are four significant figures. This means that the result ought to have four significant figures.

We have the sum; 27.258 +40.13 =   67.39. This is the result because the number of significant figures must correspond to the least number of significant figures in the sum.

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The mass of 4.640 x \(10^{2}\) L particles of Aluminium is 33.67 g

The total number of molecules present in 22.4 litres of an element is equal to Avagadro's Number.

The value of Avagadro's number = \(6.023*10^{23}\).

To calculate the mass of \(4.640*10^{2}\) litres of Al, we first need to find the number of molecules present in it, then find the product of the number of molecules present will the mass of one molecule of Al atom.

Mass of Al=27

Number of molecules in 22.4 litres of Al = \(6.023*10^{23}\)

Number of molecules in 1 litre of Al =  \(\frac{6.023*10^{23}}{22.4}\)

Number of molecules in \(4.640*10^{2}\) litres of Al=  \(\frac{{6.023*10^{23}*4.640*10^{2}}}{22.4}\)

=\(1.247*10^{21}\)

Mass of \(1.247*10^{21}\) molecules of Al:

= \(1.247*10^{21}*27\) g

=33.669 g

=33.67 g

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Answer:

D

Explanation:

H2O + H20 = H30+ + OH-

Answer:

o diferença chave entre a radioatividade e a transmutação é que a radioatividade se refere à transmutação natural, enquanto a transmutação se refere à mudança de um elemento químico em outro por meios naturais ou artciais.Tanto a radioatividade quanto a transmutação são processos químicos que envolvem a mudança de núcleos atômicos para formar um novo elemento químico a partir de um elemento químico existente. A radioatividade é um tipo de processo de transmutação

Explanation:

mais informação em; ahttps://pt.strephonsays.com/radioactivity-and-transmutation-9500

The mass of hydrogen peroxide, H₂O₂ that is required to produce 72.5 grams of water, H₂O is 136.9 g

First, we shall write the balanced equation. This is shown below:

2H₂O₂ --> 2H₂O + O₂

From the balanced equation above,

36.0306 g of H₂O were obtained from 68.0294 g of H₂O₂

With the above information, we shall determine the mass of hydrogen peroxide, H₂O₂ required to produce 72.5 grams of water. Details below:

From the balanced equation above,

36.0306 g of H₂O were obtained from 68.0294 g of H₂O₂

Therefore,

72.5 g of H₂O will be obtain from = (72.5 × 68.0294) / 36.0306 = 136.9 g of H₂O₂

Thus, the mass of hydrogen peroxide, H₂O₂ required is 136.9 g

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The Sun-Earth-Moon system is important because it sustains life on Earth, regulates Earth's climate, and influences natural phenomena like tides.

The Sun-Earth-Moon system plays a vital role in supporting and sustaining life on Earth. The Sun is the primary source of energy for our planet, providing heat and light necessary for photosynthesis, the process by which plants convert sunlight into food and oxygen. Sunlight is also crucial for maintaining Earth's temperature and driving weather patterns.

The Moon, as Earth's only natural satellite, contributes to several essential functions. Its gravitational pull creates the tides, which influence coastal ecosystems and shape coastal landscapes.

The Moon's orbit also stabilizes Earth's axial tilt, providing a stable climate for life to thrive. Additionally, the Moon's phases have cultural and historical significance, influencing human activities such as agriculture, navigation, and calendar systems.

The Sun-Earth-Moon system's interactions are responsible for natural phenomena like eclipses, both solar and lunar, which have fascinated humans throughout history and continue to be important for scientific study and exploration.

Understanding these celestial events enhances our knowledge of astrophysics and helps us comprehend the vastness and complexity of the universe.

Furthermore, the study of the Sun-Earth-Moon system provides insights into celestial mechanics, orbital dynamics, and the broader field of planetary science. By examining the interplay between these celestial bodies, scientists can gain a deeper understanding of Earth's place in the universe and explore potential habitable conditions on other celestial bodies.

Overall, the Sun-Earth-Moon system is of immense importance as it sustains life, regulates climate, influences natural phenomena, and provides a platform for scientific exploration and discovery.

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Answer:12

Explanation:because it’s 12

Answer:

Explanation:

Si tomamos en cuenta el peso molecular del agua, que es equivalente a:

1 Átomo de H₂O

O = 16 gr/mol

H = 1 gr/mol

H₂O = 18 gr/mol

Teóricamente sabemos que en 1 mol de H2O habrá 18 gr.

Para obtener los moles presentes en 1 mg de H₂O, (como 1 gr = 1000 mg), decimos:

1 mol H2O …………………………..  18000 mg

       X          ……………………………   1 mg

X = 1 / 18000 = 5,56 X 10⁻⁵ moles de H20

Y para obtener la cantidad de moléculas presentes, de acuerdo a los moles, multiplicamos por el número de Avogadro (6,023 X 10²³ moléculas /mol)

Moléculas de H₂O = 5,56x 10⁻⁵ mol x 6,023 x 10²³

Moléculas de H₂O = 3,34488 x10¹⁹ moléculas de H₂O

En el copo de nieve habrá 3,34488 x 10¹⁹ moléculas de H₂O.

Espero que te sirva =)

5,43 X 10²² particles of water (H20) are in a collection of snowflakes with a mass of 0.005 g.

The term mole is defined as the amount of substance of a system which contains as many elementary entities.

One mole of any substance is equal to 6.023 × 10²³ units of that substance such as atoms, molecules, or ions. The number 6.023 × 10²³ is called as Avogadro's number or Avogadro's constant.

The mole concept can be used to convert between mass and number of particles.

1 atom of H₂O

O = 16 g/mol

H = 1 gr/mol

H₂O = 18 gr/mol

1 mol H₂O …………………………..  18000 mg

?      X          ……………………………   1 mg

X = 1 / 18000

= 5,43 X 10²² moles de H20

Thus, 5,43 X 10²² particles of water (H20) are in a collection of snowflakes with a mass of 0.005 g.

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The element which has undergone reduction is Manganese (Mn)

From the question, we are to determine which element has undergone reduction

First, we will define the terms oxidation and reduction

Oxidation  

Oxidation can be defined as gain of oxygen. It can also be defined as an increase in oxidation state

Reduction  

Reduction can be defined as loss of oxygen. It can also be defines as a decrease in oxidation state.

Now, we will determine the oxidation numbers of the elements both in the reactants and products sides

The oxidation state of Fe changed from +2 to +3. An increase in oxidation state indicates oxidation

The oxidation state of Cl did not change. It is -1 both in the reactants and products sides

The oxidation state of K did not change. It is +1 both in the reactants and products sides

The oxidation state of Mn changed from +7 to +2. A decrease in oxidation state indicates reduction.

Hence, the element which has undergone reduction is Manganese (Mn).

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NOTE: The oxidation states of O and H (oxygen and hydrogen) did not change.

Answer:

Explanation:

All material substances are composed of minute particles or atoms of a comparatively small number of kinds and all the atoms of the same kind are uniform in size, weight, and other properties.

Hope this helped!!

Answer:

Atomic theory states that matter is composed of particles called atoms.

Explanation:

According to the theory, all types of matter can be divided into smaller parts, to the point it's indivisible.

An atom can be defined as the basic particle that composes a chemical element.

John Dalton's Atomic Theory:

Dalton's theory was further modified by the discovery of sub-atomic particles, like the electrons, neutrons and protons.

To calculate the pressure inside the canister, we can use the ideal gas law equation:

PV = nRT

Therefore, the pressure inside the canister at a campfire temperature of 1500 °C is approximately 136.39 atmospheres.

To calculate the pressure inside the canister, we can use the ideal gas law equation:

PV = nRT

Where:

P = pressure (in atmospheres)

V = volume (in liters)

n = number of moles of gas

R = ideal gas constant (0.0821 L·atm/(mol·K))

T = temperature (in Kelvin)

First, we need to convert the volume from milliliters to liters:

1500 milliliters = 1500/1000 = 1.5 liters

Next, we need to convert the temperature from Celsius to Kelvin:

1500 °C + 273.15 = 1773.15 K

Now, we can substitute the values into the ideal gas law equation:

P * 1.5 = 3 * 0.0821 * 1773.15

Simplifying the equation:

P = (3 * 0.0821 * 1773.15) / 1.5

Calculating the value:

P ≈ 136.39 atm

Therefore, the pressure inside the canister at a campfire temperature of 1500 °C is approximately 136.39 atmospheres.

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Oxygen-16: 8 protons, 8 neutrons, 8 electrons

Oxygen-18: 8 protons, 10 neutrons, 8 electrons

Using atomic and mass numbers, we can find information about the makeup of atoms.

Protons

Every element has a unique number of protons, and every atom of the same element will have the same number of protons. This means that both oxygen atoms must have the same number of protons. The number of protons in an element is equal to its atomic number. Since oxygen has an atomic number of 8, all oxygen atoms will have 8 protons. This means that oxygen-16 and oxygen-18 have 8 protons.

Neutrons

The number of neutrons an atom of a certain element can have varies. Atoms of the same element that have different numbers of neutrons are known as isotopes. The number of neutrons can be found through the mass number. The mass number is the number that follows the dash in the name of the isotope. This number is equal to the protons plus the neutrons. So, to find the number of neutrons in an oxygen atom, subtract 8 protons from the mass number. This means oxygen-16 has 8 neutrons and oxygen-18 has 10 neutrons.

Electrons

Remember that electrons are negatively charged, protons are positively charged, and neutrons have no charge. The number of electrons in an atom determines the charge of the atom. If the number of electrons equals the number of protons, then the charge of the atom will equal 0. If there are more electrons, then the atom will be negatively charged and vice versa. Since neither of the atoms has any indication of a nonzero charge, the number of electrons must equal the number of protons. So, both oxygen atoms have 8 electrons.

When a chocolate bar is solid, it is able to smell it.  It is also important to note that a substance 's molecules cannot be in two distinct phases at the a time.

In general, it is not possible for a the molecules of the chocolate  to be in two distinct phases at the same time.

It must be noted that smelling a solid, such as a chocolate bar, however, mean  the release  of loose molecules from the solid,   which may then move   through the air and   reach our olfactory receptors in our nose, allowing us to sense the fragrance.

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3.125 × 10^8 atoms of calcium-41 and 4.6875 × 10^9 atoms of potassium-41.

Option D is correct

A rare and long-lived radioactive isotope of calcium is calcium-41 (41Ca).

# Given-

Half life = 1.03×10^5 years

- After 1.03×10^5 years (1 half life)

calcium-41 will be 50%

potassium-41 will be 50%

- After 2.06×10^5 years (2 half lives)

calcium-41 will be 25%

potassium-41 will be 75%

- After 3.09×10^5 years (3 half lives)

calcium-41 will be 12.5%

potassium-41 will be 87.5%

- After 4.12×10^5 years (4 half lives)

calcium-41 will be 6.25%

potassium-41 will be 93.75%

After 4.12×10^5 years,

Calcium-41  = 6.25/100 × 5 × 10^9  =  3.12×10^8 atoms

Potassium-41  = 93.75/100 × 5 × 10^9  =  4.69×10^9 atoms

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The mass in grams of 4.60 x 10^23 atoms is approximately 9.17 g.

To find the mass in grams of 4.60 x 10^23 atoms, we need to consider the molar mass and Avogadro's number. Avogadro's number (6.022 x 10^23) represents the number of atoms or molecules in one mole of a substance.

First, we need to determine the molar mass of the substance in question. Let's assume we are dealing with a specific element, such as carbon (C), which has a molar mass of approximately 12.01 g/mol.

To calculate the mass in grams, we can use the following formula:

Mass (in grams) = (Number of atoms / Avogadro's number) x Molar mass

Substituting the given values:

Mass (in grams) = (4.60 x 10^23 atoms / 6.022 x 10^23) x 12.01 g/mol

Calculating the expression:

Mass (in grams) = (0.763 mol) x 12.01 g/mol

Mass (in grams) = 9.17 g

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Answer: Protons cannot change in an atom because that would change the identity of a particle. Electrons on the other hand can be added or removed creating an ion. Neutrons can also be added or removed to create an isotope.

Answer:

58.44277 gram

Explanation:

The measure of the length of events and the duration of intervals between events is time.

The duration of events or the gaps between them can be measured, compared, or even ordered using time. The lengthy period of time that the Earth's geologic history takes up is known as geologic time. Starting at the beginning of the Archean Eon  formal geologic time runs until the present. Geology is defined as the "Science of the Earth."

Geology is the fundamental Earth science that examines how the earth created, its structure and composition, and the various forces acting on it. It is sometimes known as geoscience or earth science.

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Answer:

1.55 × 10²⁵ atoms of H  

Explanation:

3.21mol C₃H₈ × 8mol H × (6.022×10²³)

Answer:

ok that makes sense

Explanation:

elect me for president

Answer:

Sheesh

Explanation:

Answer:

Absolute zero is the theoretical temperature at which all matter would have zero thermal energy and all molecular motion would stop. This temperature is equal to -273.15 degrees Celsius or -459.67 degrees Fahrenheit. It is the lowest possible temperature in the universe and cannot be reached in practice, as it is impossible to completely eliminate all thermal energy from matter.

Answer:

First, we need to determine the molar mass of HCl.

The molar mass of HCl = the mass of hydrogen (1.008 g/mol) + the mass of chlorine (35.45 g/mol) = 36.45 g/mol.

Next, we can use Avogadro's number (6.02 x 10^23 molecules/mol) to convert the number of molecules to moles:

6.02 x 10^24 molecules / 6.02 x 10^23 molecules/mol = 10 moles

Finally, we can use the molar mass to convert moles to grams:

10 moles x 36.45 g/mol = 364.5 grams

Therefore, the mass of 6.02 x 10^24 molecules of HCl is 364.5 grams.

Answer:

Explanation:

The moles of HCl added to this mixture = 0.0375 mol

The chemical equation for this reaction: NaOH + HCl → NaCl + H2O

NaOH is the limiting reagent.

Qsurr = -Qrxn = -4.68 kJ

Enthalpy for the neutralization reaction: -62.72 kJ/mol

Thermochemical equation for the dissociation of sodium hydroxide:

a) NaOH → Na+ + OH-

b) NaOH(s) → Na+(aq) + OH-(aq)

The percent error for the experiment is calculated to be 6.17%.

The sources of experimental error could be variations in the temperature measurements, evaporation of the solutions leading to a lower mass, and heat loss due to inadequate insulation.

In terms of bonds breaking and forming, the breaking of the ionic bond in NaOH and the formation of new bonds between Na+ and Cl- and between H+ and OH- are responsible for the enthalpy change.

Conclusion: The purpose of this experiment was to determine the heat of solution of sodium hydroxide and the heat of neutralization between sodium hydroxide and hydrochloric acid. Based on the experimental results, the enthalpy change for the neutralization reaction was found to be -62.72 kJ/mol.

Enthalpy of neutralization between sodium hydroxide and hydrochloride was calculated to be 19.47 kJ/mol. Compared to the real value of -57.9 kJ/mol, this number is 134.5% off.

The amount of heat generated during the neutralisation reaction that results in the formation of water and salt from one equivalent of an acid and one equivalent of a base is known as the heat of neutralisation of an acid.

1) We must apply the following formula to figure out how many moles of hydrochloride were added to the mixture:

moles = concentration x volume

Substituting the given values, we get:

moles HCl = 0.75 M x 0.0500 L = 0.0375 moles hydrochloride

2) The following is the chemical formula for the reaction of sodium hydroxide with hydrochloric acid:

NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)

3) As NaOH has a stoichiometric coefficient of 1 in the balanced chemical equation, 0.0375 moles of hydrochloride are also necessary for the entire reaction.

moles HCl used = 0.75 M x 0.0500 L = 0.0375 moles hydrochloride

4) To calculate Qsurr, we use the formula:

Qsurr = -qsys = -Ccal x ΔT

T = 27°C - 23.5°C = 3.5°C since the calorimeter's temperature rose from 23.5°C to 27°C. If the calorimeter has a heat capacity of 100 J/°C, then:

Qsurr = -Ccal x ΔT = -100 J/°C x 3.5°C = -350 J

To calculate Qrxn, we use the formula: Qrxn = -Qsurr = 350 J

Converting Qrxn to kJ, we get: Qrxn = 0.350 kJ

5) We employ the formula to calculate the enthalpy change for the neutralising process: ΔHrxn = Qrxn / moles hydrochloride

Substituting the calculated values, we get:

ΔHrxn = 0.350 kJ / 0.0375 moles = -9.33 kJ/mol hydrochloride

The exothermic nature of the reaction, which releases heat, is shown by the negative sign.

6) There are two ways to express the thermochemical equation for the dissociation of sodium hydroxide:

sodium hydroxide(s) → Na+(aq) + OH-(aq) ΔH = 44.5 kJ/mol (endothermic)

sodium hydroxide(aq) → Na+(aq) + OH-(aq) ΔH = -44.5 kJ/mol (exothermic)

7) Enthalpy of neutralisation between hydrochloric acid and sodium hydroxide is really -57.9 kJ/mol. We apply the following formula to get the percent error:

% error = |experimental - actual| / actual x 100%

Substituting the values, we get:

% error.

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Answer:

B. Chemically reactive

Explanation:

A Chemically reactive element is an element that is likely to combine with another element to form new substances

The reactivity of the element depends on the number of electrons in the outermost energy level and even the distance of the outermost energy level from the nucleus.  From the periodic table, Fluorine is the most reactive non-metal while francium is the most chemically reactive metal