Tellurium has eight isotopes: Te-120 (0.09%), Te-122 (2.46%), Te-123 (0.87%), Te-124 (4.61%), Te-125 (6.99%), Te-126 (18.71%), Te-128 (31.79%), and Te-130 (34.48%). What is its’ average atomic mass?

Answer:

9

Explanation:

Nitrogen-16

Atomic number of nitrogen= 7

electrons=7

protons=7

neutrons= ?

Nitrogen-'16'= 16 means the mass

16-7= 9

There are 9 neutrons in Nitrogen-16

Explanation:

A prime illustration of sour salad dressing formulas and suspension. Vinegar is also an acetic acid product which is dispersed in water, so we can't even see molecules in the oil. The removal throughout the liquid phase to make a solution.

Answer:

C

Explanation:

Please see the attached picture for the explanation.

Le Châtelier's principle:

When a stress is applied to a system at equilibrium, the system will respond by shifting in the direction that opposes/ minimizes the effect of the stress.

• This stress could be the addition or removal of a product or reactant, changes in the concentration of the products or reactants, or a change in temperature.

☆ Why can heat be written on the same side of the products when the reaction is exothermic?

• Exothermic means that heat is released, thus heat can be treated as a product.

• I like to remember it as Exothermic → Exit

An element can have multiple isotopes. Isotopes correspond to variations of the same element with respect to the number of neutrons in its nucleus. the number they give us, 35 and 37 correspond to the mass number of chlorine. The percentage will be how abundant the element is.

To find the average atomic mass we must multiply the mass of the isotope by its respective percentage of abundance and add these two results.

So, the average atomic mass of Cl will be:

Answer: the average atomic mass of chlorine is 35.454 amu

The true statement about exothermic reactions is: the energy in the system is less once the reaction makes products.

option B.

Exothermic reactions are those reactions in which energy is released into the surroundings.

This energy release results in a decrease in the internal energy of the system, which means that the energy in the system is less after the reaction than before.

Also, the decrease in energy corresponds to an increase in stability of the system. Therefore, in an exothermic reaction, the energy of the products is less than the energy of the reactants.

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Answer:

Plugging in the numbers we find the average force to be Favg=18,436 N, which is equivalent to 4124 lbs of force. The impulse delivered by this force is the product of the average force the the contact time, resulting in an impulse of 12.91 Ns.

Answer:

the force multiplied by the time the objects are in contact

Explanation:

took the quiz

Approximately 1.50 moles of peanuts in 9.00 * 10^{24} peanuts

To answer your question, we will use the concept of moles, which is a unit of measurement in chemistry that helps to relate the number of particles (in this case, peanuts) to a more manageable and comparable quantity.
First, we need to know the number of peanuts in one mole. This value is known as Avogadro's number, which is approximately 6.022 * 10^{23} particles per mole. Now, we will use this information to calculate the number of moles of peanuts in the given amount.
Step 1: Identify the given amount of peanuts:
9.00 * 10^{24} peanuts
Step 2: Divide the given amount of peanuts by Avogadro's number:
\frac{9.00 * 10^{24} peanuts) }{ (6.022 * 10^{23} peanuts/mole)}
Step 3: Perform the calculation:
(\frac{9.00 }{ 6.022}) * (\frac{10^{24 }10^{23}) ≈ 1.495
Step 4: Round the answer to a reasonable number of significant figures (in this case, three):
1.50 moles

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The primary of a transformer is the coil connected to the input voltage source.

A transformer consists of two coils of wire, known as the primary coil and the secondary coil, which are wound around a common iron core. The primary coil is connected to the input voltage source, while the secondary coil is connected to the load or the output.

The primary coil is designed to receive the input voltage and induce a magnetic field within the transformer's core. This magnetic field, in turn, induces a voltage in the secondary coil, which is then connected to the load, providing the desired output voltage.

By connecting the primary coil to the input voltage source, the transformer allows for the efficient transfer of electrical energy from the primary side to the secondary side. The number of turns in the primary and secondary coils determines the voltage transformation ratio of the transformer.

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The primary coil of a transformer is the coil to which the input voltage is applied. It creates a changing magnetic field in the iron core and determines the voltage ratio between the input and output of the transformer.

In a transformer, the primary coil is the coil to which the input voltage is applied. It is responsible for creating a changing magnetic field in the iron core when an alternating current (AC) flows through it. The primary coil is wound around the iron core and is connected to the power source.

When the AC current flows through the primary coil, it generates a changing magnetic field in the iron core. This changing magnetic field induces a voltage in the secondary coil, which is connected to the load. The primary coil determines the voltage ratio between the input and output of the transformer.

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The change in temperature is 30.52K.

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Answer:

Covalent bonds

Explanation:

they go together with water molecules

Matter is found all around us and is present in all substances in the universe. Substances have a uniform composition and changes in this composition of of a substance is called chemical reaction.

The appropriate words that fill in the blanks are;

1) Mass

2) Substance

3) Properties

4) Physical

5) Density

6) Chemical

Matter has mass and occupy space. Matter with a uniform and unchanging composition is called a substance.

Substances have physical and chemical properties. The physical properties of a substance such as density can be observed without changing the composition of the substance.

Chemical properties of a substance such as rusting can only be observed when the chemical composition of the substance is altered(chemical reaction).

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Examining the real GDP per capita in different countries allows economists to compare the economic productivity and output per person in different parts of the world.

Examining the real GDP per capita in different countries allows economists to compare the economic productivity and output per person in different parts of the world. GDP per capita is a measure that represents the average economic output per individual within a country. It takes into account the total GDP of a country and divides it by the population, providing a per-person measure. By comparing the real GDP per capita across countries, economists can assess and compare the relative economic development, living standards, and overall economic performance of different regions. It provides insights into the level of economic activity, income distribution, and the ability of countries to generate wealth and provide for their populations. This comparison can help identify disparities in economic development, understand the impact of policies and economic systems, and inform decisions related to international trade, investment, and development cooperation. Additionally, examining real GDP per capita over time allows for tracking economic progress, identifying trends, and analyzing the effectiveness of economic policies and reforms.

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Answer:

B, D, C

Explanation:

the solution may have more than one solute, a solution is a homogenous mixture of 2 or more substances and not all solutions are liquid

A solution is formed by the mixture of substances dissolved in water. There may have more than one solute. Not all solutions are liquid but there exists solid solutions too. Hence, options A, B, C are correct.

A solution is a combination of a solvent and a solid solute. The solute can be completely dissolved in the solvent and can have a partial solubility.

Water is a good solvent which dissolve majority of compounds. But there are other solvents too forming solution with suitable solutes. Solutions can be homogenous or heterogenous. Homogenous solutions are forming one phase and the solute particles are uniformly arranged.

Heterogeneous solutions are those where the solute particles are arranged in a non-uniformity and they form a different phase from the solvent.

There can be more than one solute in a solution provided that the solute can be of miscibility with each other.

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Among the options provided, the statement that accurately describes a type of potential energy found in a container full of a chemical substance in liquid form is: "The bonds between atoms are one place where potential energy is stored."

In a container filled with a chemical substance in liquid form, the potential energy is primarily stored in the bonds between atoms within the molecules of the substance. These bonds are formed by the sharing or transferring of electrons between atoms, creating a stable arrangement. The potential energy arises from the electrostatic interactions between the charged particles involved in these chemical bonds.When the liquid substance is in its equilibrium state, the potential energy stored in the bonds represents the energy required to break these bonds and separate the atoms, transforming the substance into a different state (such as a gas or a solid).

This potential energy is released when the substance undergoes a chemical reaction or when external forces act upon it.While other forms of potential energy can also exist in a liquid substance, such as kinetic energy due to the speed of the particles or vibrational energy of the atoms within the molecules, these are generally associated with other types of energy rather than potential energy.

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The pH of a 1.25 x 10^-3 M NaOH solution is approximately 9.81. The given options do not include the correct answer for the pH of a 1.25 x 10^-3 M NaOH solution.

A pH scale is used to calculate how acidic or basic a solution is.

In this question, we are given the molarity of a sodium hydroxide (NaOH) solution and we need to calculate its pH.

The formula for calculating pH is:

pH = -log[H+],

In the context of the pH calculation, [H+] represents the molar concentration of hydrogen ions present in the solution.

For a basic solution like NaOH, we can use the formula:

[OH-] = Kw / [H+],

where Kw is the ionization constant for water, which is 1 x 10^-14 at 25°C.

We can then use the relationship [OH-] x [H+] = Kw to calculate [H+] and then use the pH formula to calculate pH.

Molarity of NaOH solution = 1.25 x 10^-3 M

First, we need to calculate the hydroxide ion concentration ([OH-]) using the formula:
[OH-] = Kw / [H+]
[OH-] = 1 x 10^-14 / (1.25 x 10^-3)
[OH-] = 8 x 10^-12 M

Next, we can use the relationship [OH-] x [H+] = Kw to calculate [H+]:
8 x 10^-12 x [H+] = 1 x 10^-14
[H+] = 1.25 x 10^-3 M / 8 x 10^-12
[H+] = 1.56 x 10^-10 M

Now that we have the hydrogen ion concentration, we can use the pH formula to calculate pH:
pH = -log[H+]
pH = -log(1.56 x 10^-10)
pH = 9.81

Therefore, the pH of a 1.25 x 10^-3 M NaOH solution is approximately 9.81. The given options do not include the correct answer for the pH of a 1.25 x 10^-3 M NaOH solution.

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The volume of 6.9 mol of oxygen at 233 K and a pressure of 4.0 atm is approximately 12.0L.

To calculate volume of a gas, we can make use of Ideal Gas Law equation. It is a fundamental equation in thermodynamics that describes the behaviour of an ideal gas under certain circumstances. It relates pressure(P), volume(V), number of moles (n), and temperature(T) of an ideal gas using the equation:

PV = nRT

Where P = Pressure of the gas,

           V = Volume of the gas,

           n = Number of moles of the gas,

           R = Ideal gas constant commonly expressed as 0.0821  L·atm/(mol·K) or 8.314 J/(mol·K),

          T = Temperature of the gas.

In the question, we are given with:

n = 6.9 mol

T = 233 k

P = 4.0 atm

Substituting the above values in the equation to find the volume, we get:

4.0 * V = 6.9 * 0.0821 * 233

V = (6.9 * 0.0821 * 233) / 4.0

V = 11.9997 (approximately 12.0)

Therefore, The volume of 6.9 mol of oxygen at 233 K and a pressure of 4.0 atm is approximately 12.0L.

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Extinct

When all of the members of species die out it is called extinct

Answer:

A. 7.56

b. 57.12

Explanation:

Hope that's right have a nice day :)

A debate among scientists on how new species form is based on speciation.

Divergence explains how organisms on Earth are related because it shows how species are similar or different.

Genes play the role in diversity of carrying information that results in changes from one generation to the next.

Natural selection is part of evolution because it explains why attributes are either in existence or have gone extinct.

One of the main debates among scientists on how new species form centers around the concept of speciation. There are two main hypotheses for speciation: allopatric speciation and sympatric speciation.

Divergence is the process by which different populations or species of organisms evolve from a common ancestor over time. This process is responsible for the diversity of life on Earth. By studying the similarities and differences between different organisms, scientists can infer evolutionary relationships.

Genes are the basic units of inheritance that carry information from one generation to the next. They play a crucial role in creating diversity among organisms. The genetic diversity of a population is the result of mutations, gene flow, and genetic drift.

The theory of natural selection is one of the most important and widely accepted explanations for the diversity of life on Earth. It is the process by which certain traits become more or less common in a population over time, depending on their impact on the survival and reproduction of the organisms that possess them.

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Answer:

Opposites attract, It will be attracted to a negative charge

Explanation:

Answer:

4.34%

Explanation:

The  accepted value for the density of rubber is 1.15 g/mL

Let the calculated value for the density of rubber is 1.2 g/mL

We need to find the percent error for rubber stopper. It can be calculated as follows :

\(\text{Error}=\dfrac{|\text{actual value-calculated value}|}{\text{actual value}}\times 100\\\\\text{Error}=\dfrac{1.15-1.2}{1.15}\times 100\\\\\text{Error}=4.34\%\)

a. 63.13 g of silver bromide is formed. b. Potassium bromide is limiting, and silver nitrate is in excess. c. 0.56 g of potassium bromide is left over. d. The percent yield is 46.96%.

In this problem, we first need to determine which reactant is limiting and which one is in excess. To do this, we can calculate the amount of product that each reactant would produce if it were completely consumed. The reactant that produces less product is the limiting reactant, and the other reactant is in excess.

In this case, using the molar masses of the reactants and the stoichiometry of the balanced chemical equation, we find that silver nitrate would produce 108.22 g of silver bromide, while potassium bromide would produce only 63.13 g. Therefore, potassium bromide is limiting, and silver nitrate is in excess.

To determine the amount of excess reactant left over, we can use the amount of limiting reactant consumed in the reaction to calculate the amount of product formed, and then subtract this from the total amount of product formed. In this case, 29.12 g of potassium bromide is consumed, producing 63.13 g of silver bromide. Therefore, 92.67 g - 29.12 g = 63.55 g of potassium bromide is in excess, and 63.55 g - 63.13 g = 0.42 g of potassium bromide is left over.

Finally, to calculate the percent yield, we can divide the actual yield (14.77 g) by the theoretical yield (63.13 g) and multiply by 100%. This gives us a percent yield of 23.41%, but we need to divide by the stoichiometric coefficient of silver bromide (1) to get the percent yield based on silver bromide. Therefore, the percent yield based on silver bromide is 23.41%/1 = 23.41%. The percent yield based on silver nitrate or potassium bromide would be different, but they are not relevant for this problem.

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we find the energy to be approximately \(3.41 * 10^-19\) Joules is the answer.

To calculate the wavelength of a photon with a frequency of 61.7 MHz, we can use the formula: wavelength = speed of light / frequency. The speed of light is approximately\(3 * 10^8\) meters per second.

Converting the frequency to Hz (\(1 MHz = 10^6 Hz\)), we have \(61.7 * 10^6\)Hz.

Plugging these values into the formula, we get: wavelength =\((3 * 10^8 m/s) / (61.7 * 10^6 Hz).\)

Simplifying, we find the wavelength to be approximately 4.862 meters.

Now, to calculate the energy of a photon with a wavelength of 582.8 nm, we can use the equation: energy = Planck's constant × speed of light / wavelength.

Planck's constant is approximately \(6.63 * 10^-34\) Joule-seconds.

Converting the wavelength to meters (\(1 nm = 10^-9 m\)), we have \(582.8 * 10^-9 m.\)

Plugging these values into the equation, we get: energy =\((6.63 * 10^-34J·s) * (3 * 10^8 m/s) / (582.8 * 10^-9 m).\)

Simplifying, we find the energy to be approximately \(3.41 * 10^-19\) Joules.

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Between OH and C=O, the strong nucleophile is OH and the strong electrophile is C=O.

1. OH (hydroxide ion) is a strong nucleophile because it has a negative charge on the oxygen atom, which allows it to donate its lone pair of electrons to an electrophilic center.
2. C=O (carbonyl group) is a strong electrophile because the carbon atom has a partial positive charge due to the electronegativity difference between carbon and oxygen atoms in the double bond. This makes the carbon atom highly susceptible to nucleophilic attack.

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Answer:

Activation energy, in chemistry, the minimum amount of energy that is required to activate atoms or molecules to a condition in which they can undergo chemical transformation or physical transport.

Explanation:

Answer:

33. 8

Explanation:

Answer: C: Texture change is not a clue that a chemical reaction is taking place.

Explanation: During a chemical reaction, the atoms in the reactants rearrange to form new products. This process can result in the formation of a solid, a change in color, or the formation of a new substance. However, the texture of the substances involved in the reaction may or may not change, and it is not a reliable indicator of a chemical reaction.

Therefore, the correct answer is C.

Explanation:

1) 3,4-dimethyl hex-1,5-diyne

2) 3,3-diethyl pent-4-yn-1-ene

3) 5-(1'-ethyl-2',3'-dimethyl propane) dec-1,3-diyne

2. You work for an environmental company as an environmental toxicologist and have been hired to determine the contaminant present in a local resident’s pool. Create a flow chart outlining how you would detect the possible presence of Fe2+ and/or Sr2+

Answer: 197.26 g Na2S2O3

Explanation:

64.3/103 (molar mass of NaBr)  X 2 moles Na2S2O3 X 158 (molar mass of Na2S2O3.