Does the atomic number of an element equal the number of neutrons in an atom of that element?

Answer:

= konstanta produk kelarutan

= kation dalam larutan berair

= anion dalam larutan berair

= konsentrasi relatif a dan b

DARI WEB

Divide the mass of the compound by the mass of the solvent and then multiply by 100 g to calculate the solubility in g/100g . Solubility of NaNO3=21.9g or NaNO3 x 100 g/ 25 g =87.6. Calculate the molar mass of the dissolved compound as the sum of mass of all atoms in the molecule.

Answer:

K_{sp} = [A^+]^a [B^-]^b

K_{sp} = solubility product constant

A^+ = cation in an aquious solution

B^- = anion in an aqueous solution

a, b = relative concentrations of a and b

Explanation:

The height of the described cylinder is 0.85 cm

Substitute the values

Substitute the values

Therefore, height of the described cylinder is 0.85 cm

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Gordon should use the visual clue of the "lower shank curve" to select the correct working end of an explorer for use on a molar.

Dental explorers are dental instruments used to detect tooth decay or other irregularities in the teeth. They have a pointed tip at one end and a working end at the other, which can be straight or curved. The lower shank curve is the part of the explorer where the shank (handle) of the instrument begins to curve towards the working end.

When using an explorer on a molar, the lower shank curve should be positioned towards the back of the mouth, facing downwards towards the lower jaw. This allows the clinician to more easily navigate the contours of the molar teeth and detect any irregularities.

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Using the standard curve provided, we can use the equation y = mx + b, where y is the glucose level in mg/dl and x is the absorbance value. The slope of the line is 0.0071 and the intercept is 0.0514.

Plugging in x = 0.7, we get: y = 0.0071(0.7) + 0.0514 = 0.05647 mg/dl

Rounding to the nearest whole number, we get that person A's blood glucose level is 0 mg/dl. However, it is important to note that this may not be an accurate result as it falls outside of the range of the standard curve provided.

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Answer:

the correct answer is D

Answer:

It is D

Explanation:

Gravitational Force does not implie to have contact or if you want an easier explanation. Gravity doesn't touch you to move you.

Though you do need physical contact to open a door, because you are touching it!

The color of the indicator will correspond to the pH values of either acidic or basic substances.

pH values are values which are obtained from taking the negative logarithm to base ten of the hydrogen ions concentration of a substance.

pH values of acidic substances are less than 7 while the pH of basic or alkaline substances are greater than 7.

An indicator is an organic dye which changes colour according to the pH of a substance.

Examples of indicators are methyl orange and phenolphthalein.

Therefore, the color of the indicator will correspond to pglh values of either acidic or basic substances.

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Answer:

1g/

Explanation:

density=mass÷volume

5g÷5ml

1g/m

The principle of option D. Uniformitarianism states that the physical, chemical, and biological processes at work shaping the Earth today have also operated in the

Option D. Uniformitarianism is the principle stating that the physical, chemical, and biological processes at work shaping the Earth today have also operated in the geologic past. It is based on the idea that the present is the key to the past. In other words, the same natural laws that operate in the universe today have been operating since the beginning of time.

James Hutton was the first to propose this principle in the late 18th century. He suggested that the Earth was shaped by slow-acting geological forces such as erosion, sedimentation, and uplift over long periods of time. He believed that the same processes were still happening today and that they had operated in the past.

This principle is an important concept in geology because it allows scientists to interpret the Earth's history based on the processes that they observe today. By understanding how these processes work and how they have changed over time, scientists can reconstruct the history of the Earth and its environments.

Uniformitarianism has been tested and proven through many observations and experiments. For example, the study of sedimentary rocks has shown that they were formed in the past through the same processes that are observed today, such as deposition of sediment by water, wind, or ice.

Similarly, the study of volcanoes has shown that they are formed by the same processes as today, such as the movement of magma from deep within the Earth.

In conclusion, Uniformitarianism is the principle that allows us to interpret the Earth's history by observing the processes that shape it today. It is a fundamental concept in geology and has been tested and proven through many observations and experiments.

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The pH of the buffer solution made from 0.350 mol of HBrO and 0.110 mol of KBrO in 2.0 L of solution is approximately 8.1.

To determine the pH of a buffer solution, we need to consider the equilibrium between the weak acid (HBrO) and its conjugate base (BrO⁻). The Henderson-Hasselbalch equation is commonly used for this purpose:

pH = pKa + log\(\frac{[A]^{-}]}{[HA]}\)

where pKa is the negative logarithm of the acid dissociation constant (Ka), [A⁻] is the concentration of the conjugate base, and [HA] is the concentration of the weak acid.

In this case, the weak acid is HBrO and its conjugate base is BrO⁻. Given the concentrations of HBrO and KBrO in the buffer solution, we can calculate the concentrations of [A⁻] and [HA].

[HA] = moles of HBrO / volume of solution

[A⁻] = moles of KBrO / volume of solution

Let's calculate the concentrations:

[HA] = 0.350 mol / 2.0 L = 0.175 M

[A⁻] = 0.110 mol / 2.0 L = 0.055 M

Now, we need to calculate the pKa value for HBrO using its Ka value:

pKa = -log(Ka) = -log(2.5 × 10⁻⁹) = 8.6

Finally, we can substitute the values into the Henderson-Hasselbalch equation to find the pH:

pH = 8.6 + log(0.055/0.175)

pH = 8.6 + log(0.3143)

pH ≈ 8.6 + (-0.502)

pH ≈ 8.1

Therefore, the pH of the buffer solution made from 0.350 mol of HBrO and 0.110 mol of KBrO in 2.0 L of solution is approximately 8.1.

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Answer:

Frequency is 2Hz

Explanation:

Answer:

First lets write down the chemical formula

baking soda:

NaHCO₃
citric acid:

CH3COOH

Lets write the base ionization reaction for NaHCO3

NaHCO3 + H2O -> NaOH + CO2+ H2O

With this equations down, we can clearly see that baking soda produce carbon dioxide gas since H2CO3 dissolves into CO2+ H2O. The required part is HCO3-, where that does not apply to citric acid

A. The partial pressure of argon in the flask is 0.865 atm.

B. The partial pressure of ethane in the flask is 0.535 atm.

To solve for the partial pressures of argon and ethane in the flask, we can use the ideal gas law, PV = nRT, where P is pressure, V is volume, n is the number of moles of gas, R is the gas constant, and T is temperature in Kelvin. We first need to find the number of moles of argon in the flask, which can be done using its molar mass and the given mass:

n(Ar) = m(Ar) / M(Ar) = 1.20 g / 39.95 g/mol = 0.0300 mol

Next, we can use the total pressure and the ideal gas law to find the number of moles of ethane in the flask:

P(total) = P(Ar) + P(ethane)

P(ethane) = P(total) - P(Ar) = 1.400 atm - 0.865 atm = 0.535 atm

n(ethane) = (P(ethane) * V) / (R * T) = (0.535 atm * 1.00 L) / (0.0821 L·atm/mol·K * 298 K) = 0.0220 mol

Finally, we can use the number of moles and the volume to find the partial pressures of argon and ethane:

P(Ar) = (n(Ar) * R * T) / V = (0.0300 mol * 0.0821 L·atm/mol·K * 298 K) / 1.00 L = 0.865 atm

Thus, the partial pressure of argon in the flask is 0.865 atm.

P(ethane) = (n(ethane) * R * T) / V = (0.0220 mol * 0.0821 L·atm/mol·K * 298 K) / 1.00 L = 0.535 atm

Therefore, the partial pressure of ethane in the flask is 0.535 atm.

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The volume of \(NH_3\) produced is 7.55 L, assuming constant temperature and pressure. \(H_2\) is the limiting reactant, and all of it will be consumed in the reaction, producing 0.338 moles of \(NH_3\).

The balanced equation for the reaction between nitrogen gas and hydrogen gas to form ammonia gas is:

\($N_{2(g)} + 3H_{2(g)} \rightarrow 2NH_{3(g)}}$\)

From the equation, we see that 1 mole of \(N_2\) reacts with 3 moles of \(H_2\) to produce 2 moles of \(NH_3\). Therefore, we need to determine the limiting reactant to calculate the volume of \(NH_3\) produced.

To do this, we can use the ideal gas law, which states that the number of moles of a gas is directly proportional to its volume, assuming constant temperature and pressure. Therefore, we can convert the given volumes of \(N_2\) and \(H_2\) to moles and compare their ratios to determine the limiting reactant.

Using the ideal gas law, we can calculate the number of moles of \(N_2\):

\($n(N_2) = \dfrac{V(N_2)}{V_m(N_2)}$\)

\($n(H_2) = \dfrac{V(H_2)}{V_m(H_2)}$\)

Substituting the given values into these equations, we get:

\(n(N_2)\) = 4.68 L / 22.4 L/mol = 0.209 moles

\(n(H_2)\) = 3.79 L / 22.4 L/mol = 0.169 moles

Since the stoichiometric ratio of \(N_2\) to \(H_2\) is 1:3, we can see that \(H_2\) is the limiting reactant, as we only have 0.169 moles of \(H_2\), which is less than the amount required to react with all of the \(N_2\) (0.209 moles). Therefore, all of the \(H_2\) will be consumed in the reaction, and we can calculate the volume of \(NH_3\) produced using the number of moles of \(NH_3\) formed, which is twice the number of moles of \(H_2\) consumed:

\($n(NH_3) = 2 \times n(H_2) = 2 \times 0.169 , \text{moles} = 0.338 , \text{moles}$\)

Using the ideal gas law again, we can calculate the volume of \(NH_3\):

\($V(NH_3) = n(NH_3) \times V_m(NH_3)$\)

where Vm(\(NH_3\)) is the molar volume of \(NH_3\) at the same temperature and pressure.

Substituting the given values, we get:

\(V(NH_3)\) = 0.338 moles x 22.4 L/mol = 7.55 L

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The density of air is approximately 1.18 g/L, as the earth's atmosphere has an average molar mass of 29.00 mol and a surface temperature of 298.0 K.

To find the density of air, we can use the ideal gas law equation, which states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.
Since we are given the pressure (1.000 atm) and temperature (298.0 K), we can rearrange the equation to solve for the number of moles. Rearranging, we get n = PV/RT. Plugging in the given values, we have n = (1.000 atm * V) / (0.0821 L·atm/(K·mol) * 298.0 K).

Next, we can calculate the mass of air by multiplying the number of moles by the molar mass. The molar mass of air is given as 29.00 g/mol. Thus, the mass of air is equal to n * molar mass = (1.000 atm * V * 29.00 g/mol) / (0.0821 L·atm/(K·mol) * 298.0 K). Finally, we can find the density of air by dividing the mass by the volume:

density = mass/volume = ((1.000 atm * V * 29.00 g/mol) / (0.0821 L·atm/(K·mol) * 298.0 K)) / V. Simplifying this expression, we find that the density of air is approximately 1.18 g/L.

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Answer:

136

Explanation:

The Mass Number is the combination of the amount of Protons and Neutrons in an element, so if the total mass is 222, and the amount of protons is 86, then you can do 86 + x = 222 to find that x is equal to 136

If a racemic mixture of two enantiomers is given, the specific rotation will be zero.

A racemic mixture contains equal amounts of both enantiomers, which have opposite signs of rotation. Therefore, the rotations of the individual enantiomers cancel each other out, resulting in a net rotation of zero.Specific rotation is a measure of the degree of rotation of the plane of polarized light by a chiral substance.

Chiral compounds rotate plane-polarized light in either a clockwise or counterclockwise direction, depending on the orientation of their asymmetric carbon atoms.

Since a racemic mixture contains equal amounts of both enantiomers, it will not rotate the plane of polarized light because the rotations of the individual enantiomers will cancel each other out.

This is because the polarized light will experience the same amount of rotation in the clockwise and counterclockwise directions, leading to a net rotation of zero. Hence, the specific rotation of a racemic mixture is zero.

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The kinetic molecular theory of gases is a straightforward, historically significant classical model of the thermodynamic behavior of gases that laid the foundation for many key thermodynamic concepts.

The main points of the kinetic molecular theory are;

Thermal energy is the form of energy that exists in a system and controls its temperature. Heat is the form thermal energy takes.

Thermal conduction is the process by which quickly moving particles contact their nearby counterparts to transfer some of their kinetic energy. It is sometimes referred to as heat conduction. Areas with higher temperatures flow into areas with lower temperatures, causing this phenomenon.

Any system that doesn't interchange either energy or matter with its surroundings is said to be isolated.

A closed system only transfers energy to its surroundings.

Energy and matter can move freely between an open system and the outside world.

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An atom is the smallest component of a substance into which an element can be divided while retaining its identity. Atom hasn't gained many significant new features in the last few years.

However, we have been updating the security and compound during this time to ensure that we're being good stewards of the project and product. The opportunity to analyse the conceptual character of the term "element" is extremely rare, but it can be done by looking at the connection that now exists between chemists and philosophers of chemistry. From the food our bodies digest to the way the sunlight we receive is created, chemical processes occur all around us. Understanding physical and chemical changes is essential before beginning chemical processes.

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Answer:

The correct option is;

A. 0

Explanation:

The ammonia molecule has four pairs of electron whereby being located around the central nitrogen atom is tetrahedral in shape.

Of the four pairs of electrons, three are the bonds between nitrogen and hydrogen, such that there is only one lone pair of electron in the ammonia molecule that is located on the central nitrogen atom

The one electron on each hydrogen atoms and one of the electrons on the nitrogen atom form a bonding pair of electrons, that is the bonding pair of electrons are shared by the two nuclei, hydrogen and nitrogen

Since a lone pair are a pair of electrons attached to only one nucleus, the hydrogen in ammonia has no lone pair of electrons.

To estimate the volume of a drop of water, you can use a piece of lab equipment called a micropipette.

A micropipette is a precision instrument that is used to measure and transfer small volumes of liquid. It works by suctioning up a known volume of liquid and then dispensing it into a test tube or other vessel. The micropipette is accurate to within 0.1-1% of the total volume, making it ideal for measuring small volumes such as drops of water.

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Answer:

60 grams

Explanation:

We have the balanced equation (without state symbols):

6

H

2

O

+

6

C

O

2

→

C

6

H

12

O

6

+

6

O

2

So, we would need six moles of carbon dioxide to fully produce one mole of glucose.

Here, we got  

88

g

of carbon dioxide, and we need to convert it into moles.

Carbon dioxide has a molar mass of  

44

g/mol

. So here, there exist

88

g

44

g

/mol

=

2

mol

Since there are two moles of  

C

O

2

, we can produce  

2

6

⋅

1

=

1

3

moles of glucose  

(

C

6

H

12

O

6

)

.

We need to find the mass of the glucose produced, so we multiply the number of moles of glucose by its molar mass.

Glucose has a molar mass of  

180.156

g/mol

. So here, the mass of glucose produced is

1

3

mol

⋅

180.156

g

mol

≈

60

g

to the nearest whole number.

So, approximately  

60

grams of glucose will be produced.

Explanation:

Element Atomic Number Valency

Valency of Hydrogen 1 1

Valency of Helium 2 0

Valency of Lithium 3 1

Valency of Beryllium 4 2

Valency of Boron 5 3

Valency of Carbon 6 4

Valency of Nitrogen 7 3

Valency of Oxygen 8 2

Valency of Fluorine 9 1

Valency of Neon 10 0

Valency of Sodium (Na) 11 1

Valency of Magnesium (Mg) 12 2

Valency of Aluminium 13 3

Valency of Silicon 14 4

Valency of Phosphorus 15 3

Valency of Sulphur 16 2

Valency of Chlorine 17 1

Valency of Argon 18 0

Valency of Potassium (K) 19 1

Valency of Calcium 20 2

Valency of Scandium 21 3

Valency of Titanium 22 4

Valency of Vanadium 23 5,4

Valency of Chromium 24 2

Valency of Manganese 25 7, 4, 2

Valency of Iron (Fe) 26 2, 3

Valency of Cobalt 27 3, 2

Valency of Nickel 28 2

Valency of Copper (Cu) 29 2, 1

Valency of Zinc 30 2

Answer:

Element Atomic Number Valency

Valency of Hydrogen 1 1

Valency of Helium 2 0

Valency of Lithium 3 1

Valency of Beryllium 4 2

Valency of Boron 5 3

Valency of Carbon 6 4

Valency of Nitrogen 7 3

Valency of Oxygen 8 2

Valency of Fluorine 9 1

Valency of Neon 10 0

Valency of Sodium (Na) 11 1

Valency of Magnesium (Mg) 12 2

Valency of Aluminium 13 3

Valency of Silicon 14 4

Valency of Phosphorus 15 3

Valency of Sulphur 16 2

Valency of Chlorine 17 1

Valency of Argon 18 0

Valency of Potassium (K) 19 1

Valency of Calcium 20 2

Valency of Scandium 21 3

Valency of Titanium 22 4

Valency of Vanadium 23 5,4

Valency of Chromium 24 2

Valency of Manganese 25 7, 4, 2

Valency of Iron (Fe) 26 2, 3

Valency of Cobalt 27 3, 2

Valency of Nickel 28 2

Valency of Copper (Cu) 29 2, 1

Valency of Zinc 30 2

Answer:

China, Mongolia, Russia, and North Korea. They were told to fly at 1400 meters but they flew at 1500 feet making them crash.

Explanation:

the solution's pH is roughly 4.29. Chemistry's fundamental idea of pH is used to define the characteristics of aqueous solutions.

The solution to this issue lies in realising that the buffer solution is made up of sodium benzoate, which is the conjugate base of benzoic acid. The pH of the solution can be determined using the Henderson-Hasselbalch buffer equation: pH equals pKa plus log([A-]/[HA]).

where [A-] is the concentration of the benzoate anion (the conjugate base), [HA] is the concentration of benzoic acid, and pKa is the dissociation constant of benzoic acid.

Benzoic acid has a pKa of 4.20.

We must first determine the ratio of [A-]/[HA]:

[A^-]/[HA] = 0.140/0.115 = 1.22

Following that, we can enter the values into the Henderson-Hasselbalch equation as follows:

pH = 4.20 + log (1.22)

pH = 4.20 + 0.09

pH = 4.29

As a result, the solution's pH is roughly 4.29.

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Answer:

helium

Explanation:

because there are no electrons screening it from the nucleus

Large metropolitan areas have difficulty dealing with solid waste because they lack suitable landfill sites nearby since the city is expansive and the correct option is option D.

Disposal of solid wastes is a stinging and widespread problem in both urban and rural areas in many developed and developing countries.

This is mainly due to the increasing generation of such solid waste and the burden posed on the municipal budget. In addition to the high costs, the solid waste management is associated lack of understanding over different factors that affect the entire handling system.

Thus, the ideal selection is option D.

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Answer: Ionic attractions

Explanation:

Ionic bonding is a type of chemical bond that involves the electrostatic attraction between oppositely charged ions.