a. How many grams are in 9.62 x 10 23 atoms of Magnesium? ( the 23 is supposed to be the 23rd power)

There are 454.4 Calories in a 79.7 g candy bar.

To find the fuel value of the candy bar, we need to use the formula:

q = C * ΔT

where q is the heat released by burning the candy bar, C is the heat capacity of the calorimeter, and ΔT is the change in temperature.

First, we need to convert the heat capacity to joules per degree Celsius:

8.55 kJ/degree C = 8550 J/degree C

Now we can plug in the values and solve for q:

q = 8550 J/degree C * (45.7°C - 19.0°C)
q = 228,930 J

To convert joules to kilojoules, we divide by 1000:

q = 228.93 kJ

So the fuel value of the candy bar is 228.93 kJ.

To find how many Calories are in a 79.7 g candy bar, we need to divide the fuel value by the mass of the sample and then convert from kilojoules to Calories:

Calories = (228.93 kJ / 11.5 g) * (1 Cal / 4.184 kJ) * 79.7 g
Calories = 454.4 Calories

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The characteristic of elemental bromine reacting vigorously with elemental sodium metal to form a white solid represents a chemical property.

Chemical characteristics define how substances react or change chemically. A white solid forms when elemental bromine and sodium metal combine, suggesting a chemical transition.

However, a substance's physical attributes can be detected or quantified without changing its chemical composition. Colour, density, melting, and boiling points are physical qualities.

It is a chemical property of elemental bromine to react with sodium metal and generate a new compound.

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Answer: Radio Waves

Explanation:

electromagnet transmit Radio waves

Mass spectrometry is a technique used to determine the mass-to-charge ratio of molecules, ions, and fragments of molecules. It can be used to study the structure and composition of proteins.

Mass spectrometry is a powerful tool for studying protein structure and composition as it can detect small changes in protein mass, which can indicate the presence of post-translational modifications or covalent modifications to the protein. Mass spectrometry can detect these modifications without requiring a large sample of protein, making it a useful tool for working with small amounts of protein. X-ray diffraction is a technique that is used to determine the three-dimensional structure of a protein. This technique works by using an X-ray beam to interact with a crystal of the protein sample, which then produces a diffraction pattern that can be analyzed to determine the structure. This technique requires a large amount of protein sample and the protein must be pure and conformationally stable in order to produce accurate results. Additionally, X-ray diffraction requires information about the protein-coding gene or genes in order to accurately determine the structure.

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Answer: B

Explanation: The clouds act almost like a lid. Think of it like when you put tin foil over food before it goes in the oven. so that even after it is removed from the heat the tin foil traps it causing it to stay warm.

Approximately 30% of the energy that comes from the Sun to the Earth is reflected back into space. This phenomenon is known as albedo, and it is primarily influenced by the reflective properties of clouds, ice, and the Earth's surface. These surfaces reflect sunlight rather than absorbing it, resulting in a cooling effect on the planet.

A significant portion of the Sun's energy, around 47%, warms the land and water on Earth. When sunlight reaches the Earth's surface, it is absorbed by the land, water bodies, and vegetation, causing an increase in temperature. This absorbed energy plays a crucial role in driving various atmospheric and oceanic processes, including weather patterns, ocean currents, and the water cycle.

The remaining 23% of the Sun's energy is utilized by photosynthesis, the process through which plants and some microorganisms convert sunlight into chemical energy. This energy powers the growth and development of plants, allowing them to synthesize sugars and other organic compounds necessary for their survival. Photosynthesis also plays a vital role in maintaining the balance of atmospheric gases, as plants absorb carbon dioxide and release oxygen, contributing to the regulation of the Earth's climate.

In summary, while 30% of the Sun's energy is reflected, approximately 47% warms the land and water, and the remaining 23% is used for photosynthesis, sustaining life on Earth and shaping our planet's climate systems.

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Answer:

When determining the age of a victim withing ages 15-22, dental remains provide comparison of the stage of tooth formation shown in X-rays and bone.

Lithium has 3 protons in the nucleus.

Atomic number =number of protons =number of electrons

According to the question,

we have been given atomic number= 3

So, number of protons will be 3 and number of electrons will also be 3.

We can additionally calculate number of neutrons as follows-

number of neutrons= mass number - number of protons

                                   = 6.941 - 3

                                   ≈ 4

Hence, the number of protons in lithium will be 3.

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The nucleus of Lithium has three protons.

The number of protons or electrons in the nucleus of a neutral atom is known as its Atomic number.

The total mass of an atom's protons and neutrons is known as its mass number. (neutrons and protons added together Equals nucleons)

Atomic mass= Mass number + Neutrons

Atomic number equals the sum of the protons and electrons

Since, atomic number given is 3

Therefore, protons in the nucleus will be 3.

Additionally, we may determine the neutron number using the formula below.

mass number = number of neutrons + number of protons

⇒ 6.941 = number of neutrons + 3

⇒ number of neutrons will be approximately 4.

Thus, lithium will contain three protons.

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Answer:

b i think im not fully sure

Explanation:

Answer:

C- Both isolation and low population

Explanation:

90 percent sure

Answer:

Compound

Explanation:

compound: Substance that is made up of more than one type of atom bonded together

mixture: a combination of two or more elements of compound which are not chemically bonded

Burning a 54.0-g sample of sodium in the air to produce sodium oxide results in a mass of sodium oxide greater than 54.0 g.This is because, during the burning process, sodium combines with oxygen from the air to form the sodium oxide compound.

Sodium (Na) is a highly reactive metal that readily reacts with oxygen (O2) in the air. When sodium is burned, it undergoes oxidation, where each sodium atom loses one electron to form a sodium ion (Na+). Simultaneously, oxygen molecules gain two electrons each to form oxide ions (O2-). The resulting reaction forms sodium oxide (Na2O) by combining two sodium ions with one oxide ion.

The mass of the sodium oxide formed will be greater than the initial mass of sodium because the reaction involves the addition of oxygen atoms from the air to the sodium atoms. This results in an increase in the total mass of the product. Therefore, the mass of the sodium oxide produced will be greater than 54.0 g, making the correct answer choice "greater than 54.0 g."

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Answer:

3.125g/mol

Explanation:

To find the molar mass of the gas, we need to initially find the number of moles (n) contained in the gas. To find the number of moles, we use the general gas law whose equation is:

PV=nRT

Where; P= Pressure

V= Volume occupied by gas

n= number of moles

R= general gas constant

(0.0821 L atm mol/K)

T= absolute temperature

According to the question; P= 2.0atm, V= 2.0L, n= ?, T= 298K

To find n, we make it the subject of the formula:

n= PV/RT

n= 2.0 × 2.0 / 0.0821 × 298

n= 4/ 24.4658

n= 0.16mol

If number of moles (n) of the gas is 0.16mol and it weighs 0.500g, its molar mass can be found using:

number of moles (n) = mass (g) / molar mass

Making MM subject of the formula;

molar mass = mass / number of moles

MM= 0.500/0.16

MM= 3.125

Hence, the molar mass of the gas is 3.125g/mol.

Answer:

Chemical changes cause a substance to change into an entire substance with a new chemical formula. Chemical changes are also known as chemical reactions. The “ingredients” of a reaction are called reactants, and the results are called products.

Hope it helps

Three balloons filled with neon carbon dioxide and hydrogen are released into the atmosphere using the data in Table 3.6 on page 90 describe the movement of each balloon

Three balloons filled with neon, carbon dioxide, and hydrogen are released into the atmosphere. ... The neon and hydrogen balloons will rise/ float because they have a lighter density than air. The carbon dioxide balloon will sink/not rise because it has a heavier density than air.

There are four types of chemical bonds essential for life to exist: Ionic Bonds, Covalent Bonds, Hydrogen Bonds, and van der Waals interactions. We need all of these different kinds of bonds to play various roles in biochemical interactions. These bonds vary in their strengths.

To play a variety of roles in biochemical interactions, we require all of these diverse sorts of linkages. The tensile strength of these linkages varies. In chemistry, we consider the range of strengths between ionic and covalent bonds to be overlapping. This indicates that in water, ionic bonds usually dissociate. As a result, we shall consider these bonds from strongest to weakest in the following order:

Covalent is followed by ionic, hydrogen, and van der Waals.

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Answer:

B

Explanation:

DuPont created the first acrylic fibers in 1941 and trademarked them under the name Orlon.

The reaction that take place when active metals react with acids are:

Active metals are those metals which are very reactive and are found high above hydrogen in the activity series of metals.

The reactivity of metals is determined by the ability of the meta to give up electrons to form positive ions called cations.

Therefore, active metals are those metals that readily give up their electrons to form cations.

The active metals are found in the group 1A and 2A and 3A of the periodic table.

The active metals include; sodium, potassium, calcium, aluminum, magnesium, zinc etc.

The active metals react with dilute acids to displace hydrogen, resulting in the evolution of hydrogen gas.

Considering the given equations, the reactions of the active metals are:

Mg (s) + 2HCl (aq) → MgCl₂ (aq) + H₂ (g)

Zn (s) + 2 HCl (aq) → ZnCl₂ (aq) + H₂ (g)

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Answer:

they be Cappin like a mf

Explanation:

tell the truth mf

I think the answer is 10!

Answer:

Which half-reaction equation represents reduction?

answer is 2

Answer:

B CU2+ +2e- -> Cu

Explanation:

reduction means something opposite of the word

reduction means an electron is GAINED in the part before the arrow

it's the " + 2e- " part of the equation before the arrow or "->" part

oxidation is the LOSING of an electron so it would show up to the right of arrow or "->" of the equation as "+2e-"

both reduction & oxidation reactions are called "redox"

in a battery

anode is oxidation

cathode is reduction

anode is positive

cathode is negative electrode

decomposing compounds is electrolysis.

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Answer:

Frequency of spinal trait in the population = 0.11

Explanation:

Given:

Total spineless trait = 600

Number of spinal trait = 80

Find:

Frequency of spinal trait in the population

Computation:

Total population = Total spineless trait + Number of spinal trait

Total population = 600 + 80

Total population = 680

Frequency of spinal trait in the population = Number of spinal trait / Total population

Frequency of spinal trait in the population = 80 / 680

Frequency of spinal trait in the population = 0.11

Answer:

1. Metals

2. Metaloids

3. Non-Metals

4. Alkali Metals

5. Transition Metals

6. Halogens

7. Noble Gases

The osmotic tolerance of an organism such as Staphylococcus differs from the osmotic tolerance of E.coli as well as the cellular structure difference that is  based on is given below:

Enterococci and Escherichia coli are less salt tolerant than staphylococci. Their cell walls are more stiff, and their internal turgor pressure is higher.

In response to hyperosmotic shock, E. coli imports potassium and, if available, suitable solutes such proline and glycine betaine (27).

Most strains of Staphylococcus aureus grow well in a high-NaCl concentration media containing as much as 15% NaCl because it is a salt-tolerant eubacterium (1).

Therefore, Osmotolerant microorganisms are those that can accomplish this and so endure hypertonic conditions. Osmotolerant microorganisms, including Staphylococcus aureus, may thrive in a wide range of osmotic pressures and conditions. In fact, media containing sodium chloride (NaCl) concentrations up to 3M can be used to cultivate this bacteria.

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Explanation:

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arrow_backSources of Information on Modern Indian History

Summary

Videos

References

A primary source of information for historians is the official records of the British administration. The British kept written records of every key instruction, meeting, transaction, investigation, plan, policy decision and agreement. They attached record rooms with all the important administrative institutions.

The British built specialized institutions like museums and archives to preserve important documents.

Historians gather important information about the provincial administrative system from the reports, memos, notings and letters preserved in the 19th century in the archives and record rooms across India.

For effective administration, the British carried out a number of surveys in the early 19th century.

By the end of the 19th century, censuses of all the Indian provinces were being carried out every ten years. This helped to collect information on the religion, caste and occupation of the people. These surveys have helped historians to collect information about modern India.

Personal diaries of personalities like Jawaharlal Nehru and Sardar Vallabhbhai Patel, newspapers, popular books like The Discovery of India and Glimpses of World History, autobiographies of personalities like Mahatma Gandhi, and accounts of travellers and pilgrims give a deep insight into the lives of the common people.

Answer:

speed is a scalar quantity and velocity is a vector quantity.

Speed is distance/time and velocity is displacement/time

Answer:

Velocity is vector and speed is scalar

Explanation:

Answer:

I dont understand what is the question you need help on-

Explanation:

Answer:

Explanation:The main problem with Bohr's model is that it works very well for atoms with only one electron, like H or He+, but not at all for multi-electron atoms.

2,500 years ago, Democritus suggested that all matter in the universe was made up of tiny, indivisible, solid objects he called "atomos." However, other Greek philosophers disliked Democritus' "atomos" theory because they felt it was illogical.

Answer:

The last one

Explanation:

I have done this before

Answer:

Earth's plates moving & colliding against one another.

Answer:

bec12 is it.one or i it is under 180

The given chemical equation is:H+ + CN- ⇋ HCN .The equilibrium constant is given as:Kc = [HCN]/([H+] [CN-])We know that the concentration of NaCN is equal to the concentration of CN-, the [CN-] is 0.100 M.

The formula to calculate pH is:pH = -log[H+]Initially, we need to calculate the concentration of H+ ions.Using the chemical equation, we can write:

[HCN] = [H+] [CN-]/KcLet [H+] be x, we have

[HCN] = x (0.100)/Kc[HCN]

= (x * 0.100)/9.12 x 10^-10

= (0.100x)/9.12 x 10^-10(x * 0.100)/(0.100x)

= 9.12 x 10^-10/0.100

= 9.12 x 10^-9

Now we can apply the quadratic formula to solve for x.

x2 + 9.12 x 10^-9 x - 9.12 x 10^-11 = 0x

= (-9.12 x 10^-9 ± √(9.12 x 10^-9)^2 - 4(1)(-9.12 x 10^-11))/(2(1))x

= (-9.12 x 10^-9 ± √8.34144 x 10^-17)/2

Now we need to select the correct value for x.pH = -log[H+]When we solve for x, we get two values:

x = 1.20 x 10^-4, -7.56 x 10^-10

Since the value of x cannot be negative, we select the positive value of x.

x = 1.20 x 10^-4pH

= -log[H+]pH

= -log[1.20 x 10^-4]pH

= 3.9

Therefore, the correct answer is option C. 4.52.

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Since pH + pOH = 14, we can calculate the pH:

pH = 14 - pOH = 14 - 4.52 = 9.48

Therefore, the pH of the 0.100 M NaCN solution is approximately 9.48.

To calculate the pH of a solution of NaCN, we need to consider the dissociation of NaCN into Na+ and CN- ions. CN- can react with water to form HCN and OH- ions. The equilibrium expression for this reaction is:

CN- + H2O ⇌ HCN + OH-

Given that the K value for this reaction is 9.12 x 10^(-10), we can set up an equilibrium expression:

K = [HCN] * [OH-] / [CN-]

Since NaCN is a strong electrolyte, we can assume that the concentration of CN- after dissociation is equal to the initial concentration of NaCN, which is 0.100 M.

Let's assume that the concentration of OH- at equilibrium is x M. The concentration of HCN would also be x M, and the concentration of CN- would be 0.100 M - x M.

Plugging these values into the equilibrium expression, we have:

9.12 x 10^(-10) = (x * x) / (0.100 - x)

Simplifying the equation, we get:

9.12 x 10^(-10) = x^2 / (0.100 - x)

Multiplying both sides by (0.100 - x), we have:

9.12 x 10^(-10) * (0.100 - x) = x^2

Expanding and rearranging the equation, we obtain a quadratic equation:

9.12 x 10^(-11) - 9.12 x 10^(-10) * x + x^2 = 0

Now, we can solve this equation using the quadratic formula:

x = (-b ± √(b^2 - 4ac)) / (2a)

For this equation, a = 1, b = -9.12 x 10^(-10), and c = 9.12 x 10^(-11).

Solving the quadratic equation using the quadratic formula, we find two solutions for x:

x = 2.98 x 10^(-5) M (approximately) or x = 9.12 x 10^(-6) M (approximately)

The concentration of OH- at equilibrium is x, so the concentration of OH- is approximately 2.98 x 10^(-5) M.

Since pH is defined as the negative logarithm of the hydrogen ion concentration, we can calculate the pOH as:

pOH = -log10([OH-]) = -log10(2.98 x 10^(-5)) = 4.52

Finally, since pH + pOH = 14, we can calculate the pH:

pH = 14 - pOH = 14 - 4.52 = 9.48

Therefore, the pH of the 0.100 M NaCN solution is approximately 9.48.

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