Describe two physical properties of matter and how those properties are measured.

Answer:

It gets its identity from tiny particles: positively charged protons in the nucleus, balanced by negatively charged electrons all around, plus neutrons, which have no charge at all.

An element takes its identity from its atomic number, which is the number of protons in the nucleus of its atoms.

Each element has a unique atomic number, and this number determines the element's chemical and physical properties.

For example, the atomic number of Carbon is 6, which means that all carbon atoms have 6 protons in their nuclei. This unique number of protons gives carbon its characteristic chemical and physical properties, such as its ability to form covalent bonds with other atoms.

Therefore, an element's identity is determined by its atomic number, which is the number of protons in an atom's nucleus.

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Answer:

B

Explanation:

I believe it is B but I am not entirely sure! don't do this is B doesn't sound or look right to you!

Answer:

Its D

Explanation:

Larger atoms in group 8A require higher boiling points for the molecules to separate from each other than smaller atoms in group 8A.

Step 1

The reaction is written and balanced:

4 Rb + O2 =>2 Rb2O

-----------

Step 2

Define % yield of product (Rb2O) = (Actual yield/Theoretical yield) x 100

The actual yield is provided by the exercise = 39.7 g

----------

Step 3

Determine the limiting reactant. The molar masses are needed to solve this:

For Rb) 85.4 g/mol

For O2) 32 g/mol

Procedure:

4 Rb + O2 =>2 Rb2O

4 x 85.4 g Rb ----- 32 g O2

82.4 g Rb ----- X = 7.72 g O2 are needed

For 82.4 g Rb, 7.72 g O2 is needed, but there is 11.6 g O2. Therefore, O2 is the excess agent. Rb is the limiting reactant.

--------

Step 4

Determine the theoretical yield from the limiting reactant:

The molar mass Rb2O) 187 g/mol

Procedure:

4 x 85.4 g Rb ------ 2 x 187 g Rb2O

82.4 g Rb ------ X = 90.2 g Rb2O = Theoretical yield

---------

Step 5

% yield = Actual y./Theoretical y. x 100 = (39.7 g/90.2 g) x 100 = 44 % approx.

Answer: % yield = 44 %

a single neutral atom of zinc has 30 protons

HCl is used instead of plain deionized water in p-phenetidine in amide synthesis of acetophenetidin because HCl's polarity contributes to a reaction driven to the right, it is used for the acid-base reaction rather than water. It protonates the amine group, allowing it to dissolve easily.

An acid-base neutralization reaction is represented as a double-replacement reaction in this traditional representation. For example, the reaction of hydrochloric acid (HCl) with sodium hydroxide (NaOH) solutions yields a solution of sodium chloride (NaCl) and a few extra water molecules.

When acid and base react, they produce salt and water. Water and salt are both neutral, which means that when acid and base react, they neutralize each other. As a result, it is known as a neutralization reaction.

Thus,  HCl's polarity contributes to a reaction driven to the right.

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The number of atoms in 9.35 moles of lithium is 5.63×10²⁴ atoms

The correct answer to the question is Option A. 5.63×10²⁴ atoms

From Avogadro's hypothesis,

1 mole of Li = 6.02×10²³ atoms

With the above information in mind, we can obtain the number of atoms in 9.35 moles of lithium. This can be obtained as follow:

From Avogadro's hypothesis,

1 mole of Li = 6.02×10²³ atoms

Therefore,

9.35 moles of Li = 9.35 × 6.02×10²³

9.35 moles of Li = 5.63×10²⁴ atoms

Therefore, the number of atoms in 9.35 moles of lithium is 5.63×10²⁴ atoms

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Answer:

5.63x10^24 Atoms

Explanation:

The final volume of the gas is 15.8 L.

The Ideal gas law is the equation of state of a hypothetical ideal gas. It is a good approximation to the behaviour of many gases under many conditions, although it has several limitations. The ideal gas equation can be written as-

                      PV = nRT

where,

P = Pressure

V = Volume

T = Temperature

n = number of moles

Given,

n = 1

Pressure = 1 atm

W = 1 kJ

Temperature = 77⁰F

γ = 1.4

PV = nRT

The temperature in K is written as -

T = ( 77 - 32 ) 5/9 + 273.15

= 298.15 K

\(w = \frac{nr( T_{1} - T_{2)} }{\pi - 1}\)

T₂ = 250.04 K

The initial volume of the container is -

P₁V₁ = nRT₁

101.32 Pa × V = 1 × 8.314 × 298

V = 0.025 m³

The final volume of the gas is worked out from the equation -

\((\frac{V_{2} }{V_{1} } ) = (\frac{T_{1} }{T_{2} })^{(1.4 - 1)}\)

V = 0.0158 m³ = 15.8 L

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Neoclassical economics focuses on supply and demand as the driving forces behind the production and consumption of goods and services.

It should be noted that Neoclassical economics emphasizes the choices of consumers. Thus, in neoclassical economics, the value of products and services is above the costs of production.

Hubbert's peak theory states that the rise, peak, and decline of fossil fuel production with revolutions in new technology will be longer than originally predicted before the oil reserves run out

The tragedy of the commons is an economic problem of overconsumptio, and depletion of a common pool resource

One thing that puts tremendous pressure on our biodiversity and natural resources is an ever-growing demand for resources by a growing population.

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Answer:

1. Neoclassical economics focuses on supply and demand as the driving forces behind the production and consumption of goods and services.

2. It should be noted that Neoclassical economics emphasizes the choices of consumers. Thus, in neoclassical economics, the value of products and services is above the costs of production.

3. Hubbert's peak theory states that the rise, peak, and decline of fossil fuel production with revolutions in new technology will be longer than originally predicted before the oil reserves run out

4. The tragedy of the commons is an economic problem of overconsumptio, and depletion of a common pool resource

5. One thing that puts tremendous pressure on our biodiversity and natural resources is an ever-growing demand for resources by a growing population.

the law of conservation of mass applies.....?

Answer:

B

Explanation:

It was the correct answer when I answered it

The part of the wave that the arrow is pointing to is the crest.

Hence we can conclude that the part of the wave that the arrow is pointing to is the crest.

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The relative atomic mass of an element is compared with the mass of an atom of carbon-12.

Carbon-12 is chosen as the reference because it has a mass of exactly 12 atomic mass units (amu). The relative atomic mass, also known as atomic weight, provides a standard for comparing the masses of different elements.

It is calculated based on the weighted average of the masses of an element's naturally occurring isotopes, taking into account their abundance. By using carbon-12 as the reference, scientists establish a consistent scale for expressing atomic masses.

This standardization is essential for accurately conveying the mass of atoms in a way that is universally understandable and comparable across various elements and compounds.

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Both Technician A and Technician B are correct in their statements about octane ratings and the use of regular and high octane gasoline.

Technician A is correct because most modern engines are designed to use regular grade gasoline, which has an octane rating of 87. This is the most commonly used gasoline and it is suitable for most engines.

Technician B is also correct because high octane gasoline, which has an octane rating of 91 or higher, should only be used when an engine was designed to use it. High octane gasoline is more expensive and is not necessary for most engines. However, some high-performance engines require high octane gasoline to prevent engine knocking and to achieve optimal performance.

Therefore, both Technician A and Technician B are correct in their statements about octane ratings and the use of regular and high octane gasoline.

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Answer:

75.92

Explanation:

A)the % abundance adds up to 100, so adding all the % abundances of Ge:

20.52 + 27.45 + 7.76 + 36.52 = 92.25

The remaining % abundance is:

100 - 92.25 = 7.75%

B) Using this formula:

\(atomic \: mass = \frac{sum \: of \: (\% \: isotope \: abundance \times isotope \: mass)}{100} \)

\(72.63 = \frac{(20.52 \times 69.92) + (27.45 \times 71.93) + (7.76 \times 72.92) + (36.52 \times 73.92) + (7.75x)}{100} \)

multiply both sides by 100 to get rid of the fraction:

\(7263= {(20.52 \times 69.92) + (27.45 \times 71.93) + (7.76 \times 72.92) + (36.52 \times 73.92) + (7.75x)}{} \)

multiplying each bracket:

\(7263 = 1434.7584 + 1974.4785 + 565.8592 + 2699.5584 + 7.75x\)

adding up the terms:

\(7263 = 6674.6545 + 7.75x\)

subtract 6674.6545 on both sides to give:

\(588.3455 = 7.75x\)

divide both sides by 7.75:

\(x = \frac{588.3455}{7.75} = 75.92 \: (2dp)\)

Which of the following is true for a nuclear reaction is that the identity of an element changes in a nuclear reaction are  a nuclear reaction A nuclear reaction is a process that transforms one nucleus into another by changing the number of protons or neutrons in the nucleus.

As a result of the nuclear reaction, a new nucleus with a different atomic number and mass number is formed.  The identity of an element changes in a nuclear reaction. A nuclear reaction changes the identity of an element, whereas a chemical reaction does not. In a chemical reaction, atoms combine or break apart to form new chemical bonds, whereas in a nuclear reaction.

the nucleus itself transforms into a different element. In a nuclear reaction, electrons are not lost or gained, and the identity of the element changes. , the main answer is that the identity of an element changes in a nuclear reaction. The is that the nuclear reaction is a process that transforms one nucleus into another by changing the number of protons or neutrons in the nucleus.

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The atomic ratio of carbon to oxygen in carbon monoxide (CO) is 1:1, and the atomic ratio of carbon to oxygen in carbon dioxide (CO₂) is 2:1.

Firstly, we can analyze the decomposition of carbon monoxide (CO) and carbon dioxide (CO₂) to determine the atomic ratios involved.

Let's denote the atomic ratio of carbon to oxygen in carbon monoxide as x, and the atomic ratio of carbon to oxygen in carbon dioxide as y.

According to the given data;

Decomposition of carbon monoxide (CO);

Oxygen produced = 3.36 g

Carbon produced = 2.52 g

We know that the atomic mass of carbon is 12 g/mol, and the atomic mass of oxygen is 16 g/mol. Using these values, we can calculate the number of moles for each element;

Number of moles of oxygen = mass / atomic mass = 3.36 g / 16 g/mol = 0.21 mol

Number of moles of carbon = mass / atomic mass = 2.52 g / 12 g/mol = 0.21 mol

Since the atomic ratio of carbon to oxygen in carbon monoxide is x, we can write the following equation;

0.21 mol C / (0.21 mol O) = x

Simplifying the equation, we have;

x = 1

Therefore, the atomic ratio of carbon to oxygen in carbon monoxide is 1:1.

Decomposition of carbon dioxide (CO₂);

Oxygen produced = 9.92 g

Carbon produced = 3.72 g

Following the same calculations as before;

Number of moles of oxygen = mass / atomic mass = 9.92 g / 16 g/mol = 0.62 mol

Number of moles of carbon = mass / atomic mass = 3.72 g / 12 g/mol = 0.31 mol

Since the atomic ratio of carbon to oxygen in carbon dioxide is y, we can write the following equation;

0.31 mol C / (0.62 mol O) = y

Simplifying the equation, we have;

y = 0.5

Therefore, the atomic ratio of carbon to oxygen in carbon dioxide is 1:0.5, which can be simplified to 2:1.

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--The given question is incomplete, the complete question is

"Missed this? watch kcv: atomic theory; read section 2.3. you can click on the review link to access the section in your text. carbon and oxygen form both carbon monoxide and carbon dioxide. when samples of these are decomposed, the carbon monoxide produces 3.36 g of oxygen and 2.52 g of carbon, while the carbon dioxide produces 9.92 g of oxygen and 3.72 g of carbon. Calculate the atomic ratio of carbon to oxygen in carbon monoxide, and carbon dioxide."--

The caloric content of palmitic acid is approximately 9 calories per gram (cal/g) which represents the potential energy that can be obtained from metabolizing palmitic acid in the body.

The caloric content of a substance is determined by the amount of energy it provides when metabolized. Fatty acids, such as palmitic acid, are a type of macronutrient that can be metabolized to release energy.

On average, fats provide approximately 9 calories per gram. This includes both saturated and unsaturated fats, including palmitic acid. Therefore, the caloric content of palmitic acid is approximately 9 cal/g.

It's important to note that this caloric value represents the potential energy that can be obtained from metabolizing palmitic acid in the body. The actual number of calories derived from palmitic acid in the diet may depend on various factors, such as the efficiency of digestion and absorption, individual metabolic rates, and other dietary components.

The caloric content of palmitic acid is approximately 9 calories per gram (cal/g). This value represents the potential energy that can be obtained from metabolizing palmitic acid in the body.

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Answer:

partial pressure of gas D Pd = 15.5 kPa

Explanation:

As per the Dalton's law of partial pressure, in a mixture, pressure exerted by each gas when summed gives the total partial pressure exerted by mixture.

P(Total) = P1+P2+P3.....

Given P(Total) = 35.7 kPa

Partial pressure of gas A Pa = 7.8 kPa

Partial pressure of gas B Pb = 3.7 kPa

Partial pressure of gas C Pc =  8.7 kPa

There, Partial pressure of gas D Pd = P(Total) -(Pa+Pb+Pc)

Pd = 35.7-(7.8+3.7+8.7) = 35.7-20.2 kPa = 15.5 kPa

Therefore, partial pressure of gas D Pd = 15.5 kPa

The best representation of relative size of the atoms of Li, Na, K and Rb in the given options is 1.

As you move from top to bottom in the Group 1 elements, the atomic radius grows as each subsequent element gains an extra energy level (electron shell). Total amount of active energy levels (electron shells) the elements' atomic radius.

Again, the positive nuclear charge rises as the atomic number decreases inside a group. The number of major energy levels that are occupied is rising as well, though.

As you descend Group 1, there are an increasing number of occupied energy levels (or electron shells), going from 2 to 6, a radius of the element's atoms grows from 134 pm to 225 pm.

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Complete question: It is given in the image attached.

Mass of nitrate ions is 7983.90  μg/ml

The concentration of ions in a solution depends on the molar ratio of solutes, cations and anions formed in the solution. Therefore, if we have a compound that dissociates into a cation and an anion, the minimum concentration of each of these two products is the same as that of the original compound.

So, the mole ratio between the original compound and an ion that it  forms will determine the concentration of the respective ion in solution.

Amount of solute = concentration × amount of solution

= 45 ppm × 6.0 fluid ounces of water × \(\frac{29.57 ml}{1 fluid ounce}\)

= 45 μg/ml × 6.0 fluid ounces of water × \(\frac{29.57 ml}{1 fluid ounce}\)

= 7983.90  μg/ml

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I'm assuming that C is carbon.

\(4.590 \: mol \: c \times \frac{12.01 \:g \: c}{1 \: mol \: c} \)

55.1259 g of C

Answer:

animals that live in the desert hibernate in winter

am not sure

Answer:

A chemical bond is formed and energy is absorbed I do believe

Explanation:

The balanced chemical equation for the neutralization reaction between sulfuric acid and potassium hydroxide is:

H2SO4(aq) + 2KOH(aq) → K2SO4(aq) + 2H2O(l)

From the equation, we can see that one mole of sulfuric acid reacts with two moles of potassium hydroxide. Therefore, we need to calculate the number of moles of potassium hydroxide present in the 30.0 mL of 0.260 M solution:

0.260 mol/L x 0.0300 L = 0.00780 mol KOH

Since the stoichiometric ratio of sulfuric acid to potassium hydroxide is 1:2, we need twice as many moles of sulfuric acid to neutralize the potassium hydroxide:

2 x 0.00780 mol = 0.0156 mol H2SO4

Finally, we can calculate the volume of the 0.235 M sulfuric acid solution required to provide 0.0156 moles of H2SO4:

0.0156 mol / 0.235 mol/L = 0.0664 L = 66.4 mL

Therefore, 66.4 mL of the 0.235 M sulfuric acid solution is required to neutralize 30.0 mL of 0.260 M potassium hydroxide.

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Step 1: Balance the equation

To balance the equation it is necessary to have the same number of atoms of each element on both sides of the equation (reactant side and product side). Let's count the number of atoms of each element for the unbalanced equation: KClO3 -> KCl + O2

Reactant side:

K - 1

Cl - 1

O - 3

Product side:

K - 1

Cl - 1

O - 2

To balance the equation, we need to fix the number of atoms of O on the product side, let's add a 3/2 in front of it:

KClO3 -> KCl + 3/2 O2

The equation is balanced but 3/2 is not an integer. So let's multply all the equation by 2:

2 KClO3 -> 2 KCl + 3 O2

Now the equation is balanced.

A) To solve this, we need to use the ratio between O2 and KClO3. It is 3:2.

so:

3 moles of O2 ---- 2 moles of KClO3

x moles of O2 ---- 12 moles of KClO3

x = 18 moles of O2

We found the number of moles, the question asks us the number of molecules.

For this, we need to use the avogadro's constant:

6.022x10^23 molecules ---- 1 mol

x molecules ---- 18 moles

x = 1.1 x 10^25 molecules of O2

B) To solve this we use the ratio between KCl and KCl3. It is 2:2

So it is produced 4 moles of KCl when 4 moles of KClO3 react.

The amount of heat can be calculated using the thermochemical equation below is 1.19×10^ 4kJ/kgCO2

Benzene is an organic chemical compound with the molecular formula C6H6. The benzene molecule is made up of one hydrogen atom joined to each of the six carbon atoms that form a planar ring. Because it only contains carbon and hydrogen atoms, benzoene falls under the hydrocarbon category. A common industrial chemical is benzene. Crude oil contains benzene, which is also a main component of gasoline. Plastics, resin, synthetic fabrics, rubber lubricants, dye, detergents, pharmaceuticals, and pesticides are all made with it. Volcano and forest fires naturally produce benzoene.

Both natural and artificial processes can yield benzoene. It is an organic component in crude oil, the primary source of benzene used in modern manufacturing. The gas emissions form volcanoes & forest fires are examples of other natural sources.

The lab Valisure discovered benzene in various products last year, including hand sanitizers, sunscreen, deodorant, dry shampoo, conditioner, antiperspirant, deodorant, body sprays, and antifungal medications.

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The heat capacity of the calorimeter of combustion of benzoic acid is  -19.864382 kJ / 276.75 K.

To calculate the heat capacity of the bomb calorimeter, we can use the formula:

Heat released = Heat capacity * Temperature rise

In this case, the heat released is the heat of combustion of benzoic acid, which is given as -26.42 kJ/g. The temperature rise observed is 3.60°C.

First, we need to convert the mass of benzoic acid burned into grams:

Mass of benzoic acid = 0.7521 g

Next, we calculate the heat released during the combustion of benzoic acid:

Heat released = Mass of benzoic acid * Heat of combustion

             = 0.7521 g * (-26.42 kJ/g)

             = -19.864382 kJ

Now, we can use the heat released and the temperature rise to calculate the heat capacity of the calorimeter:

Heat capacity = Heat released / Temperature rise

            = -19.864382 kJ / 3.60°C

Before calculating the heat capacity, it's important to ensure that the temperature rise is in Kelvin. Since the temperature rise given is in Celsius, we need to convert it to Kelvin:

Temperature rise in Kelvin = Temperature rise in Celsius + 273.15

                         = 3.60°C + 273.15

                         = 276.75 K

Now, we can calculate the heat capacity:

Heat capacity = -19.864382 kJ / 276.75 K

Calculating this division will give us the heat capacity of the bomb calorimeter, excluding the water.

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Answer:

Explanation:

As,

Law of reflection states that , angle of incidence is always equal to angle of reflection.