The total measure
of angles in a
triangle is 180° the triangle is?​

Answer:

Potassium  

Explanation:

The reaction can be said to be at equilibrium when the reaction rates of making products and using reactants are equal.

When the rates of the forward and reverse reactions are equal and the concentrations of the reactants and products don't change over time, a chemical reaction is said to be in equilibrium.

When the system reaches equilibrium, it is in a state of balance, which means that the concentrations of the reactants and products have not changed significantly.

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The value of x is 1.

To solve the linear system using Cramer's rule, we need to find the value of x in the equation 1x + 3(2) + 9 = 16.

Simplifying the equation, we have:

x + 6 + 9 = 16

x + 15 = 16

x = 16 - 15

x = 1

Therefore, the value of x is 1.

Cramer's rule is a method used to solve systems of linear equations by using determinants. In this case, we have a single equation with one variable, so the determinant involved is a 1x1 matrix. The determinant of a 1x1 matrix is simply the value of the element.

The determinant of the coefficient matrix in this equation is 1. The determinant of the entire system is the determinant of the coefficient matrix divided by the determinant of the matrix formed by replacing the column of the variable with the constants.

Since the determinant of a 1x1 matrix is the value of the element, we have:

determinant of the entire system = determinant of the coefficient matrix / determinant of the constant matrix

= 1 / 1

= 1

Therefore, the determinant of the entire system is 1.

Using Cramer's rule, we can solve for the value of x by dividing the determinant of the matrix formed by replacing the column of the variable with the constants by the determinant of the coefficient matrix. In this case, both determinants are 1. Thus, The value of x is 1.

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When a jar containing saline solution is exposed to sunlight, its liquid content gradually diminishes and eventually forms crystals as a result of the evaporation process.

The energy from the sun's heat accelerates the movement of molecules in saltwater, which leads to their subsequent release from the liquid surface as water vapor. As a result of this process, the moisture transforms into gas and ascends, scattering throughout the atmosphere.

The concentration of salt in the remaining liquid increases as water evaporates from saltwater, as salt is unable to evaporate like water. As time passes, the salt concentration within the water triples to a point where it becomes incapable of remaining dissolved and commences the process of crystal formation.

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Answer:

To determine the change in mass of A over the given time period, we need to find the difference between the initial mass of A and the final mass of A.

From the given table, we can see that the initial mass of A at t = 0 (start time) is 12.4 g and the final mass of A at t = 60 minutes (end time) is 6.2 g.

Therefore, the change in mass of A over 60 minutes is:

Final mass of A - Initial mass of A

= 6.2 g - 12.4 g

= -6.2 g

The negative sign indicates that the mass of A decreased over time, which means that A underwent some kind of reaction or process that caused it to lose mass.

The change in mass of A over 60 minutes is -6.2 grams.

To determine the change in mass of A over 60 minutes, we need to compare the initial mass to the final mass.

From the given information, we can see that the mass of A decreases over time.

Let's calculate the change in mass.

Initial Mass of A: 12.4 g

Final Mass of A: 6.2 g

Change in Mass of A = Final Mass of A - Initial Mass of A

= 6.2 g - 12.4 g

= -6.2 g

The change in mass of A over 60 minutes is -6.2 grams.

Note that the negative sign indicates a decrease in mass.

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The volume of the weather balloon at 75 cmHg is  (n₁ * R * T₂) / P₂ = (n₁ * 0.0821 L·atm/(mol·K) * 308.15 K) / 0.9868 atm.

The volume of the weather balloon at 75 cmHg when it is heated to 35 degrees Celsius, we can use the ideal gas law, which states that the product of pressure (P) and volume (V) of a gas is proportional to the product of the number of moles (n) and the temperature (T) in Kelvin.

PV = nRT

Where R is the ideal gas constant.

First, let's convert the initial volume from dm³ to liters:

Initial volume = 605 dm³ = 605 L

At STP (Standard Temperature and Pressure), the temperature is 273.15 K and the pressure is 1 atmosphere (atm).

Using the initial conditions:

P₁ = 1 atm

V₁ = 605 L

T₁ = 273.15 K

We can calculate the number of moles (n₁) of gas using the ideal gas law:

n₁ = (P₁ * V₁) / (R * T₁)

Now, we need to find the final volume (V₂) at 75 cmHg and 35 degrees Celsius.

Converting 75 cmHg to atmospheres:

P₂ = 75 cmHg * (1 atm / 76 cmHg) ≈ 0.9868 atm

so,

P2 = 75 cmHg / 76 cmHg/atm = 0.9868 atm.

Now we can substitute the values into the equation and calculate V2:

V2 = (1 atm / 0.9868 atm) * (T2 / 308.15 K) * (605 liters).

Please provide the new temperature (T2) in Celsius, and I will calculate the volume for you.\((n₁ * R * T₂) / P₂ = (n₁ * 0.0821 L·atm/(mol·K) * 308.15 K) / 0.9868 atm\)

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The mass of the solid aluminum that forms are 192.73 grams

To determine the mass of solid aluminum that forms, we need to use stoichiometry and the balanced chemical equation for the reaction between magnesium and aluminum nitrate.

The balanced chemical equation is:

3 Mg + 2 Al(\(NO_{3}\))3 → 3 Mg(\(NO_{3}\))2 + 2 Al

The equation shows that 3 moles of magnesium react with 2 moles of aluminum to produce 2 moles of aluminum nitrate.

To calculate the mass of solid aluminum, we need to know the amount of magnesium used. Given that the volume of the magnesium is 150.0 mL and its density is 1.738 g/cm³, we can calculate the mass of magnesium using the formula:

Mass = Volume × Density

Mass of magnesium = 150.0 mL × 1.738 g/cm³ = 260.7 g

Now, using the molar mass of magnesium (24.31 g/mol) and the molar ratio from the balanced equation, we can determine the moles of magnesium used:

Moles of magnesium = Mass of magnesium / Molar mass of magnesium

= 260.7 g / 24.31 g/mol

= 10.72 mol

According to the stoichiometry of the balanced equation, the ratio of moles of magnesium to moles of aluminum is 3:2. Therefore, the moles of aluminum formed will be:

Moles of aluminum = (2/3) × Moles of magnesium

= (2/3) × 10.72 mol

= 7.15 mol

Finally, we can calculate the mass of solid aluminum using its molar mass (26.98 g/mol):

Mass of aluminum = Moles of aluminum × Molar mass of aluminum

= 7.15 mol × 26.98 g/mol

= 192.73 g

Therefore, the mass of the solid aluminum that forms is approximately 192.73 grams.

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Answer:

An atom contains three basic particles namely protons, neutrons and electrons. The nucleus of the atom contains protons and neutrons where protons are positively charged and neutrons are neutral. The electrons are located at the outermost regions called the electron shell.

The concept combined gas law is used here to determine the new pressure of the gas. This law states that the ratio between the product of pressure-volume and temperature of a system remains constant.

The combined gas law is the combination of Boyle's law, Charles's law and the Avogadro's law. These laws relate one thermodynamic variable to another holding everything else constant.

Here volume is constant, so the equation is:

P₁ / T₁ = P₂ / T₂

T₁  = 298 K

T₂ = 798 K

Pressure is:

P₂ = P₁ T₂/T₁

P₂= 2.5 × 798 / 298

P₂ = 6.69 atm

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Calcium carbonate is insoluble in water. It is a common compound found in nature, such as in limestone and marble answer C is correct

Ammonium carbonate (NH4)2CO3, on the other hand, is soluble in water. It readily dissociates into ammonium ions (NH4+) and carbonate ions (CO3^2-) when mixed with water.

Similarly, ammonium nitrate (NH4NO3) is also soluble in water. It dissociates into ammonium ions (NH4+) and nitrate ions (NO3-) when dissolved in water.

(C) Calcium carbonate is insoluble in water. It is a common compound found in nature, such as in limestone and marble. When calcium carbonate is added to water, it does not readily dissolve and remains in its solid form. This property makes calcium carbonate insoluble in water. On the other hand, ammonium carbonate, ammonium nitrate, and calcium nitrate are all soluble in water, meaning they readily dissolve and dissociate into their respective ions when mixed with water.answer C is correct

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There are a total of 250 hydrogen atoms inside the container.

Each molecule of C₄H₁₀O contains 10 hydrogen atoms. Therefore, the total number of hydrogen atoms in the container can be found by multiplying the number of molecules by the number of hydrogen atoms per molecule:

Total number of hydrogen atoms = 25 molecules x 10 hydrogen atoms/molecule

= 250 hydrogen atoms

So, there are a total of 250 hydrogen atoms inside the container.

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a. To determine the theoretical yield of Cu(OH)2, we need to first calculate the limiting reactant. The balanced chemical equation shows that 2 moles of NaOH reacts with 1 mole of Cu(NO3)2 to produce 1 mole of Cu(OH)2. We can use this information to calculate the number of moles of NaOH:

20.50 g NaOH x (1 mole NaOH / 40.00 g NaOH) = 0.5125 moles NaOH

Using the stoichiometry of the balanced equation, we can see that this amount of NaOH will react with:

0.5125 moles NaOH x (1 mole Cu(NO3)2 / 2 moles NaOH) = 0.2563 moles Cu(NO3)2

Therefore, 0.2563 moles Cu(NO3)2 will produce:

0.2563 moles Cu(OH)2 x (97.56 g Cu(OH)2 / 1 mole Cu(OH)2) = 25.00 g Cu(OH)2

So, the theoretical yield of Cu(OH)2 is 25.00 g.

b. The percent yield is calculated as the actual yield divided by the theoretical yield, multiplied by 100%:

Percent yield = (actual yield / theoretical yield) x 100%

Percent yield = (75.0 g / 25.00 g) x 100% = 300%

The percent yield is greater than 100%, which indicates that there may have been errors in the experiment that led to a higher than expected yield.

The IUPAC name of the compound is 3-Ethyl-2,2-dimethylhexane.

IUPAC naming is a systematic method of naming chemical compounds according to a set of rules established by the International Union of Pure and Applied Chemistry. It ensures that each compound has a unique and unambiguous name based on its molecular structure.

From the image:

Thus, the IUPAC name of the compound is 3-Ethyl-2,2-dimethylhexane.

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Answer:

46.76 g

Explanation:

The reaction that takes place is:

First we determine the limiting reactant:

1.3 moles of SiO₂ would react completely with (3 * 1.3) 3.9 moles of C. There are not as many C moles, meaning that C is the limiting reactant.

Now we convert C moles (the limiting reactant) into CO moles, using the stoichiometric coefficients:

Finally we convert 1.67 moles of CO to grams, using its molar mass:

The theoretical yield of the reaction between 6.20 g of carbon with excess oxygen is 22.7 g. The actual yield is given 8.35 g. Thus, the percent  yield is 36.7 %.

Percent yield of a reaction is the ratio of its actual yield to the theoretical yield multiplied by 100. The theoretical yield is calculated from the balanced chemical equation of the reaction.

One mole or 12 g of C gives one mole of carbon dioxide. Molar mass of CO₂ is 44 g/mol. Thus, the mass of carbon dioxide that can be produced from 6.20 g of C is :

= (6.20 × 44 ) / 12 g = 22.73 g.

The actual yield of CO₂ is 8.35g only. Thus, its percent yield is calculated as :

percent yield = 8.35 g/ 22.73 g × 100 = 36.7 %.

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The statement is correct. The photoelectric effect refers to the phenomenon where electrons are ejected from the surface of a material when it is exposed to light. The frequency of light striking an electron in a metal must be above the threshold frequency in order for the photoelectric effect to occur.

The statement is correct. The photoelectric effect refers to the phenomenon where electrons are ejected from the surface of a material when it is exposed to light. However, for the photoelectric effect to occur, the frequency of the incident light must be above a certain threshold frequency.

The threshold frequency is the minimum frequency of light required to dislodge electrons from the material. Below this threshold frequency, regardless of the intensity or duration of the light, no electrons will be emitted.

This behavior can be explained by the particle-like nature of light, where light is composed of discrete packets of energy called photons. The energy of a photon is directly proportional to its frequency. Only photons with energy greater than or equal to the binding energy of the electrons in the material can dislodge them.

Therefore, the frequency of light striking an electron in a metal must be above the threshold frequency in order for the photoelectric effect to occur.

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Answer:

thermal energy.

Explanation:

Thermal energy is produced when the atoms and molecules in a substance vibrate faster due to a rise in temperature.

1.6moles

The formula for calculating the molarity of a solution is expressed according to the equation:

Given the following parameters

volume of solution = 400mL = 0.4L

molarity of the solution = 4M

Determine the moles present

Hence the number of moles present is 1.6moles

An ion is an atom or a group of atoms that carries an electric charge.

An atom becomes an ion when it gains or loses one or more electrons, resulting in an unequal number of protons and electrons. This imbalance of positive and negative charges gives the ion a net charge, either positive or negative.

When an atom loses one or more electrons, it becomes a positively charged ion, called a cation. Cations have fewer electrons than protons, resulting in a net positive charge.

When an atom gains one or more electrons, it becomes a negatively charged ion, called an anion. Anions have more electrons than protons, resulting in a net negative charge.

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Answer:

ρ = 1.08 g/cm³

Explanation:

Step 1: Given data

Mass of the substance (m): 21.112 g

Volume of the substance (V): 19.5 cm³

Step 2: Calculate the density of the substance

The density (ρ) of a substance is equal to its mass divided by its volume.

ρ = m / V

ρ = 21.112 g / 19.5 cm³

ρ = 1.08 g/cm³

The density of the substance is 1.08 g/cm³.

The percentage error of the measurement, given that the accepted measurement is 7.44 g/cm³, is 1.88%

First, we shall determine the absolut error. This can be obtained as follow:

Absolute error = accepted value - measured value

Absolute error = 7.44 - 7.30

Absolute error = 0.14 g/cm³

Haven obtained the absolute error, we shall determine the percentage error. Details below:

Percentage error = (Absolute error / accepted value) × 100

Percentage error = (0.14 / 7.44) × 100

Percentage error = 1.88%

Thus, we can conclude that the percentage error is 1.88%

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Answer:

I think it's B

Explanation:

Well I'm pretty sure it's not C or D. And A is detachment or removal of soil by water, And the picture doesn't look like that. So the only explanation is B

Answer:

I go for B.

Explanation:

The temperature of the gas in Kelvin, after its volume is reduced to 2,450 mL, is approximately 143.27 K.

To determine the temperature of the gas in Kelvin after its volume is reduced, we can use the combined gas law, which relates the initial and final conditions of pressure, volume, and temperature for a given amount of gas.

The combined gas law equation is:

(P₁ * V₁) / T₁ = (P₂ * V₂) / T₂

Where P₁ and P₂ are the initial and final pressures, V₁ and V₂ are the initial and final volumes, T₁ is the initial temperature in Kelvin, and T₂ is the final temperature in Kelvin.

Given that the initial volume V₁ is 3,480 mL, the initial temperature T₁ is -70.0 °C (which needs to be converted to Kelvin), and the final volume V₂ is 2,450 mL, we can substitute these values into the equation.

To convert -70.0 °C to Kelvin, we add 273.15 to it, resulting in T₁ = 203.15 K.

Now we can solve for T₂:

(T₂ * V₁) / T₁ = V₂

T₂ = (V₂ * T₁) / V₁ = (2,450 mL * 203.15 K) / 3,480 mL

Simplifying the equation, we find:

T₂ ≈ 143.27 K

Therefore, the temperature of the gas in Kelvin, after its volume is reduced to 2,450 mL, is approximately 143.27 K.

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Answer:

The answer is

Plant also use cellular respiration

Answer:

B - Plants also use cellular respiration.

Explanation:

Did the test.

Answer:

A = 65.46 u

Explanation:

Given that,

The composition of zinc is as follows :

Zn-64 = 48.63%

Zn-66 = 27.90%

Zn-67 = 4.10%

Zn-68 = 18.75%

Zn-70 = .62%

We need to find the  average atomic mass of the given element. It can be solved as follows :

\(A=\dfrac{48.63\times 64+27.90\times 66+4.1\times 67+18.75\times 68+0.62\times 70}{100}\\A=65.46\ u\)

So, the average atomic mass of zinc is 65.46 u.

Answer:

9.990-357

Explanation:

aru not arh is 9.990-357