Which choice is not an example of a molecule?

If the molecular weight is 230.26 g/mol carbon = 73.03% = 230.26*73.03/100 = 168.15/12 = 14 Carbons Hydrogen = 6.13% = 230.26*6.13/100 = 14/1 = 14 Hydrogens Oxigen = 20.84% = 230.26*20.84/100 = 47.98/16 = 3 Oxygens Hence the empirical formula is C14H14O3

The International System for Units (SI) defines the newton as the unit of force, which is used to measure weight. For instance, a kilogram of matter weighs around 9.8 newtons on Earth's surface and around each as much on Moon.

Weight, which is expressed in newtons, is a unit of measurement for the gravitational force acting on an object. The mass of a bird with a mass of 15 g changes with the strength of the gravity influence acting on it, and would differ significantly if it were measured, for instance, on the Moon rather than on Earth.

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Approximately 35.90 grams of ice must melt to lower the water temperature to 0.0°C.

To solve this problem, we need to calculate the amount of heat that needs to be transferred from the water to the ice in order to lower the water temperature to 0.0°C.

First, let's calculate the initial heat content of the water. The specific heat capacity of water is 4.186 J/(g·K), and the mass of the water can be calculated using its density (1 g/mL) and volume (7.30 × 10^2 mL):

Mass of water = density × volume = 1 g/mL × 7.30 × 10^2 mL = 7.30 × 10^2 g

The initial heat content of the water can be calculated using the formula:

Heat content = mass × specific heat capacity × temperature change

Heat content = 7.30 × 10^2 g × 4.186 J/(g·K) × (25.0°C - 0.0°C) = 7.30 × 10^2 g × 4.186 J/(g·K) × 25.0°C

Next, we need to calculate the amount of heat that needs to be transferred from the water to the ice to lower the water temperature to 0.0°C. This heat transfer occurs during the melting of the ice.

The amount of heat required to melt the ice can be calculated using the formula:

Heat = mass of ice melted × latent heat of fusion

Let's assume that x grams of ice melts. The mass of the ice can be calculated using its density (0.92 g/mL) and volume (same as the volume of water):

Mass of ice = density × volume = 0.92 g/mL × 7.30 × 10^2 mL = 6.716 × 10^2 g

Heat = x g × 333.7 J/g

Now, we need to ensure that the heat transferred from the water to the ice is enough to lower the water temperature to 0.0°C. The heat transferred from the water to the ice is equal to the heat transferred from the water when its temperature drops to 0.0°C:

Heat content of water = Heat transferred to ice

7.30 × 10^2 g × 4.186 J/(g·K) × 25.0°C = x g × 333.7 J/g

Now, we can solve for x:

x = (7.30 × 10^2 g × 4.186 J/(g·K) × 25.0°C) / (333.7 J/g)

x ≈ 35.90 g

Therefore, approximately 35.90 grams of ice must melt to lower the water temperature to 0.0°C.

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Answer:

7.022

Explanation:

2.589x10^6/ 3.687x10^5

1. 2.589/3.687 = 0.702197 [Separate out and divide just the decimal portion first]

2.  10^6/10^5 = 10^(6-5) = 10^1  [Divide the exponent portion next]  When dividing, subtract the denominator exponent from the numerator exponent:  (6-5) = 1.  The exponent is 1.

0.702197x10^1    [Put the two pieces together: 1. and 2.]

7.02197             [Move the decimal point once to the right, which will reduce 10^1 to 10^0, or 1]

The correct response to the problem in standard form is 7.023 * 10^0.

When a number is written in scientific notation, it has a base and an index. The number is multiplied by 10 raised to a given power.

In this case, we can see that the correct response to the problem in standard form is 7.023 * 10^0.

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The amount of heat required is 19219.2 J

Mass = mole × molar mass

Mass of nitrogen = 3 × 28

Mass of nitrogen = 84 g

Q = MCΔT

Q = 84 × 1.040 × 220

Q = 19219.2 J

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The correct statement about pericyclic reactions is:

In pericyclic reactions, all bonds are broken and formed in a single step.

Pericyclic reactions are a class of organic reactions characterized by the simultaneous breaking and forming of multiple bonds in a concerted manner, meaning that all bond changes occur in a single step. This is in contrast to stepwise reactions where bonds are broken and formed in separate steps.

In a pericyclic reaction, the reactants rearrange their electrons in a concerted fashion, leading to the formation of new bonds and the breaking of existing bonds. This concerted process occurs through the overlap of molecular orbitals, allowing for the efficient transfer of electrons.

Pericyclic reactions are concerted reactions in which the breaking and forming of bonds occur simultaneously in a single step. They do not involve multiple steps or intermediates. The transition state in a pericyclic reaction is cyclic, not acyclic.

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Answer:

Substances that absorb energy in the form of heat are

b)endothermic.

hope it helps :)

This molecule is called tert-butyl alcohol, also known as tert-butanol and 2-methyl-2-propanol (IUPAC nomenclature).

All carbon atoms are \(sp^{3}\) hybridized. The oxygen atom has the same hybridization, with two of the orbitals being taken by the nonbonding electron pairs, and two by the C-O and the O-H bond.

Tert-butanol is a commonly used polar organic solvent, with a boiling point of 83 degrees Celsius and a density of 0.775 g/mL. Because it has an unusually high freezing point (26 degrees Celsius), pure tert-butanol is often solid at room temperature.
It is colorless, but has a characteristic camphorous smell, and is very miscible with water (dry tert-butanol is usually obtained through distillation over potassium or sodium).

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It is important for science teachers to know how to prepare stock solutions because stock solutions are concentrated solutions that can be used to make various dilutions for experiments and scientific investigations.


1. Consistency and accuracy: Stock solutions ensure consistency and accuracy in scientific experiments. They provide a known concentration of a specific substance, allowing teachers to prepare solutions with precise and reproducible concentrations. This is crucial for obtaining reliable and consistent results.

2. Time and resource efficiency: Stock solutions save time and resources by eliminating the need to measure and prepare individual solutions for each experiment. Once a stock solution is prepared, it can be used multiple times for different experiments or dilutions. This makes the teaching process more efficient and allows for more experiments to be conducted within a limited time frame.

3. Safety: Stock solutions are often highly concentrated and may contain hazardous substances. Teachers need to know how to properly handle, store, and dilute stock solutions to ensure the safety of themselves and their students.

By understanding the proper procedures for preparing and handling stock solutions, teachers can create an optimal learning environment for their students and facilitate meaningful scientific investigations.

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Answer:

6. physical

Explanation:

Answer:

Subatomic particles are particles present in atom, PROTON, NEUTRON, ELECTRON

Explanation:

Electron :-  MASS---> ALMOST 1/2000 TIMES MASS OF PROTON

                  CHARGE----> -1

Proton:    MASS---> 1 amu

                Charge ---> +1

Neutron:     MASS ----> 1amu

                   Charge -----> IT IS NEUTRAL

Answer:

The answer is 18.01528.

Explanation:

This compound is also known as Water or Dihydrogen Monoxide. The SI base unit for amount of substance is the mole.

Answer:

option 3) They have no freedom to move

Answer:

C

Explanation:

Answer:

livermorium

Explanation:

The atom with the largest number of neutrons is a tie between livermorium and tennessine. Each of these atoms contain 177 neutrons.

Answer:

1 closer

2 24hours

3 tidal bulges

4 in a straight line

Explanation:

Tides have been the effect of the sea with the gravitational pull of the sun and moon.

1. Earth’s tides are affected by the gravitational pull of the Sun and the Moon, but mainly the Moon because the Moon is closer to the earth.

In spite of high pull of the Sun, the distance of moon from earth results in increased effect of moon gravitational pull than Sun.

2. Each day, each coastal region on Earth experiences two high tides and two low tides in every 24 hours time period.

The daily tides has been resulted at the coast with the moon revolution around the earth's rotation.

3. This is because the gravitational attraction of the Moon creates tidal bulges on two opposite sides of the planet.

The effect of the  moon gravitational force results in the bulging or the pulling force to the sea, resulting in the diurnal tides.

4. Two spring tides occur monthly, when the Moon is in its new and full phases. During these phases, the Moon and Sun are oriented at a right angle measuring 90 degrees which gravitation pulls the water on Earth in the same direction, creating a large tidal range.

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1) Groups of elements in the periodic table.

On the left, there are several types of metals and on the right, there are nonmetals, halogens, and noble gases.

There is a group that is between those mentioned above, the semi-metals also known as Metalloids.

.

Answer:

Indegestion I believe as there isn't as much bacteria to break down his food.

Explanation:

Tbh, dont complain if you don't like a food, because when you chew it, its gonna turn into some white mush anyways, and when it comes out, its brown.

Dont blame me, blame your tooth.

The rate increases by a factor of 4.  IF the rate of the reaction  concentration of both 1-bromo butane and sodium hydroxide were doubled

What is meant by rate of reaction?

The rate of reaction refers to the speed at which the products are formed from the reactants in a chemical reaction.The reaction rate or rate of reaction is that the speed at which a chemical reaction takes place, defined as proportional to the rise in the concentration of a product per unit time and to the decrease in the concentration of a reactant per unit time. Reaction rates can vary dramatically

Why is rate of reaction important?

The rate of a reaction is a powerful diagnostic tool. By checking out how fast products are made and what causes reactions to slow down we can develop methods to improve production. This information is important for the large scale manufacture of many chemicals including fertilizers, drugs and household cleaning items.

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Explanation:

When the gymnast is standing straight up, gravity acts on the gymnast but the gymnast is able to stay relatively stable.Tihis happens because her center of mass is directly above the beam which means that gravity is pushing her down onto the beam.

Force is:F = k*(q1 + q2) / r2 In light of this, k * (2.35 * 1.96) / r2 = k * (4.06 * 2.11) / ( 2.26 ) ² / : k4.606 / r² = 8.5666 / 5.10768.5666 r² = 4.606 * 5.1076r² = 23.5256 : 8.5666r² = 2.7462r = √2.7462. Reply: r = 1.66 pm

When two (or more) objects interact, forces are produced. Both act on the other with an equal but opposing power. As a thing moves, external forces are at work. The object moves uniformly regardless of an internal force.

The state of rest or motion of an object, as well as the shape of the object, can all be changed or may have a tendency to be changed by force, which is a physical cause. A force is measured in Newtons in the S.I.

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Answer:

Gas

Explanation:

Because Crude oil can usually be found in the ground as a liquid and in the air is gas can be kerosene.

Organisms in over-populated areas do not survive well due to reduction in available food and shelter.

An unsustainable population within a specific area or habitat is referred to as overpopulation. A higher birth rate, a lower death rate, migration to an area of the ecosphere where there are fewer predators, or a rapid fall in the amount of resources available are all causes of overpopulation. Overpopulation thus refers to a situation when a population in a particular ecosystem depletes the resources necessary for subsistence or survival.

Overpopulation typically causes ecological disruption due to resource depletion. Other populations who compete for the same resources may experience a decline as a result of this disruption.

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Answer:

A. 257600g (i.e 257.6 Kg) of CaO were produced.

B. 202400g (i.e 202.4 Kg) of CO2 were produced.

Explanation:

We'll begin by calculating the mass of CaCO3 present in 5×10² Kg of lime stone. This is illustrated below:

From the question given, the lime stone contains 92% of CaCO3.

Mass of CaCO3 = 92% x 5×10² Kg

Mass of CaCO3 = 92/100 x 5×10² Kg

Mass of CaCO3 = 460 Kg

Therefore, 460 kg of CaCO3 is present in the lime stone.

Next, we shall determine the mass of CaCO3 that was heated and the masses of CaO and CO2 produced from the balanced equation. This is illustrated below:

CaCO3(s) —> CaO(s) + CO2(g)

Molar mass of CaCO3 = 40 + 12 + (16x3) = 100g/mol

Mass of CaCO3 from the balanced equation = 1 x 100 = 100g

Molar mass of CaO = 40 + 16 = 56g

Mass of CaO from the balanced equation = 1 x 56 = 56g

Molar mass of CO2 = 12 + (2x16) = 44g/mol

Mass of CO2 from the balanced equation = 1 x 44 = 44g

Summary:

From the balanced equation above,

100g of CaCO3 were heated to produce 56g of CaO and 44g of CO2.

A. Determination of the mass of quick lime, CaO produced by heating 5×10² Kg of lime stone.

5×10² Kg of lime stone contains 460 Kg (i.e 460×10³ g) of CaCO3.

From the balanced equation above,

100g of CaCO3 were heated to produce 56g of CaO.

Therefore, 460×10³g of CaCO3 will be heated to produce = (460×10³ x 56)/100 = 257600g of CaO.

Therefore, 257600g (i.e 257.6 Kg) of CaO were produced.

B. Determination of mass of carbon dioxide, CO2 produced by heating 5×10² Kg of lime stone.

5×10² Kg of lime stone contains 460 Kg (i.e 460×10³ g) of CaCO3.

From the balanced equation above,

100g of CaCO3 were heated to produce 44g of CO2.

Therefore, Therefore, 460×10³g of CaCO3 will be heated to produce = (460×10³ x 44)/100 = 202400g of CO2.

Therefore, 202400g (i.e 202.4 Kg) of CO2 produced.

Question 1: Which statement describes the quantities that can be found using the number of moles?

Answer: It can be used to find the number of molecules, atoms, or ions.

Question 2: A scientist uses 3 g of water (H2O) in an experiment. Which option describes the first step in calculating the number of molecules in 3 g of water?

Answer: Identify the molar masses of H and O.

Question 3: The molar mass of ammonia (NH3) is 17.03 g/mol. Which expression correctly shows how to determine the number of moles of ammonia equivalent to 5 g?

Answer: 5 g×1 mol/17.03 g

Question 4: How many molecules of carbon dioxide (CO2) are there in 0.450 mol of carbon dioxide?

Answer: 2.71×1023

Question 5: When magnesium chloride (MgCl2) is dissolved in water, which statement must be true?

Answer: The sum of the mass of the Mg2+ ions and the mass of the Cl– ions must be equal to the mass of MgCl2.

In this case, a water sample has been diluted to 10^-3, which means it has been diluted by a factor of 1,000 times. So, the correct answer is:

The answer is option b. 300.

When a solution is diluted, it means that more solvent (usually water) has been added to decrease the concentration of the solute. The dilution factor is the ratio of the final volume of the solution to the initial volume of the solution.

In this case, the water sample has been diluted to 10-3, which means that the concentration of the original solution has been reduced by a factor of 10-3.

To calculate the dilution factor, we need to take the reciprocal of the concentration reduction factor:

Dilution factor = 1/10-3 = 1,000

So the water sample has been diluted by a factor of 1,000 times.

Therefore, the correct answer is option b. 300 is not the dilution factor, but rather the concentration reduction factor (1/300), which is the reciprocal of the dilution factor.

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Answer:

Calcium has a smaller radius in comparison to Potassium.

Explanation:

When we move down a group, the atomic radius increases, and when we move from left to right in a period, the atomic radius decreases. Since both Potassium and Calcium are in the 4th period, we have to look left to right. Calcium is to the right of Potassium making the radius smaller.

Radiocarbon dating is used to determine the age of an object.

Radiocarbon dating is a method used to estimate the age of organic materials based on the decay of radioactive carbon-14 isotopes. This technique is widely employed in archaeology, geology, and other scientific fields. When living organisms, such as plants or animals, are alive, they maintain a ratio of carbon-14 to stable carbon-12 isotopes.

However, once they die, the carbon-14 begins to decay at a known rate. By measuring the remaining carbon-14 and comparing it to the initial ratio, scientists can calculate the time that has passed since the organism's death. This method is particularly useful for dating objects that are up to around 50,000 years old. Palynology is the study of pollen grains, taphonomy focuses on the process of decay and fossilization, and paleontology deals with the study of fossils but not specifically dating methods.

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