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23) Which statement correctly describes the charge of the nucleus and the charge of the
electron cloud of an atom?

There are 0.84 moles of aluminum ions (Al3+) present in 0.42 mol of Al2(SO4)3.

To determine the number of moles of aluminum ions (Al3+) present in 0.42 mol of Al2(SO4)3, we need to consider the stoichiometry of the compound.

The formula of aluminum sulfate (Al2(SO4)3) indicates that for every 1 mole of the compound, there are 2 moles of aluminum ions (Al3+). This means that the mole ratio of Al3+ to Al2(SO4)3 is 2:1.

Given that we have 0.42 mol of Al2(SO4)3, we can calculate the moles of Al3+ as follows:

Moles of Al3+ = 0.42 mol Al2(SO4)3 x (2 mol Al3+ / 1 mol Al2(SO4)3)

Moles of Al3+ = 0.42 mol Al2(SO4)3 x 2

Moles of Al3+ = 0.84 mol Al3+

Therefore, there are 0.84 moles of aluminum ions (Al3+) present in 0.42 mol of Al2(SO4)3.

It's important to note that the stoichiometry of the compound determines the mole ratio between the different species involved in the chemical formula. In this case, the 2:1 ratio of Al3+ to Al2(SO4)3 allows us to determine the number of moles of Al3+ based on the given amount of Al2(SO4)3.

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Answer:

Water (chemical formula: H2O) is a transparent fluid which forms the world's streams, lakes, oceans and rain, and is the major constituent of the fluids of organisms. As a chemical compound, a water molecule contains one oxygen and two hydrogen atoms that are connected by covalent bonds.

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Answer:

Explanation:

The height of the object can be found by using the formula

\(h = \frac{p}{mg } \\ \)

where

p is the potential energy

m is the mass

h is the height

g is the acceleration due to gravity which is 10 m/s²

From the question we have

\(h = \frac{23048}{39 \times 10} = \frac{23048}{390} \\ = 59.0974...\)

We have the final answer as

Hope this helps you

Answer:

2.4 M

Explanation:

1. Suppose you have 100 mL solution:

Use density to find grams of solution:

100 mL solution x (1.10 g / 1 mL) = 110 g solution

2. FInd the amount of sodium chloride pure:

110 g solution x(13 g NaCl / 100 g solution) = 14.3 g NaCl

3. Change grams to mol:

14.3 g NaCl x ( 1 mol NaCl/ 58.44 g NaCl) = 0.24 mol NaCl

4. Molarity:

M = mol NaCl / L solution

M = 0.24 mol NaCl / 0.1 L = 2.4 M

Answer:

To determine how many molecules of Magnesium Chloride Courtney has:

1. Determine the molar mass of Magnesium Chloride (MgCl2): MgCl2 = (24.305 + 35.453 * 2) = 95.211 g/mol.

2. Divide the given mass (350 g) by the calculated molar mass (95.211 g/mol): 350/95.211 = 3.681 mol.

3. Find the number of molecules by multiplying the moles (3.681 mol) by Avogadro’s number (6.022 x 10^23): 3.681 x 6.022 x 10^23 = 22.162 x 10^23 molecules.

4. Courtney has 22.162 x 10^23 molecules of Magnesium Chloride.

Energy is released during nuclear reactions. To calculate energy changes, use the attached image below. Nuclear reactions produce far more energy than other types of reactions, such as chemical reactions.

The term nuclear reaction is defined as a process in which two nuclei, or a nucleus and an external subatomic particle, collide to produce one or more new nuclides.

Normally, chemical reactions take place outside the nucleus. Nuclear reactions occur only within the nucleus. When chemical reactions occur, elements retain their identity, as do the nuclei of atoms.

Thus, in nuclear reactions, the nuclei of atoms undergo complete transformations, resulting in the formation of new elements.

The nuclear reactions are as follows:

Alpha decay - PO₈₄²°⁶⇒ ₈₂Pb²°⁶ + He⁴₂

Beta⁻ decay - Na²²₁₁ ⇒ Na ²²₁₀ + e°₋₁

Beta⁺ decay - Na²⁴₁₁ ⇒ Na₁₀²⁴ + e°₋₁+β

Gamma - CO⁶°₂₇ ⇒ Ni⁶⁰₂₆ + e°₋₁ +γ

Fission - U²³⁵₉₂ + n₀¹ ⇒ Ba¹⁴⁴₅₆ + Kr⁸⁹₃₆ +3n₀¹

Fusion- H₁² +H³₁ ⇒ He⁴₂ + n¹₀ +17.59MeV

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Answer:

Decomposition

Explanation:

Heat is added to ice at 0 °C. Explain why the temperature of the ice does not change. What does change?When heat is added to ice at 0°C, the temperature of the ice does not change. This happens because all the heat energy is used up in overcoming the intermolecular forces of attraction (hydrogen bonds) that exist between the water molecules in ice.

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Answer:

Explanation:

In order to solve this problem we need to keep in mind the Lambert-Beer law, which states:

Where ε is the molar absorption coefficient, b is the length of the cuvette, and C is the concentration.

By looking at the equation above we can see that if ε and C are constant; and b is 5 times higher (5.00 cm vs 1.00 cm) then the absorbance will be 5 times higher as well:

Answer:

It would most likely just change their color

Explanation: The frequency of dark-coloured moths increased at that time, an example of industrial melanism. Later, when pollution was reduced, the light-coloured form again predominated. ... The dark-coloured or melanic form of the peppered moth

If pollution near factories was reduced, then this situation increased the frequency of white moths.

Industrial melanism is an evolutionary feature associated with the increase of dark moths in industrial polluted areas.

In conclusion, if pollution near factories was reduced, then this situation increased the frequency of white moths.

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Answer:

A scientific theory is an explanation of an aspect of the natural world that can be repeatedly tested and verified in accordance with the scientific method, using accepted protocols of observation, measurement, and evaluation of results. Where possible, theories are tested under controlled conditions in an experiment.

Explanation:

Answer:

in prism

it's from the rectangular reflecting surface

Total mass on the syringe is 1.498 Kg . To find the total mass of a solution, we need to add the mass of the solute to the mass of the solvent.

A solute is something that a solvent can disintegrate in order to make a solution out of. A solute can take many different forms. It could be either a material, fluid, or vapour. The solute is separated and dispersed among its molecules adequately by the solvent, or substance, which induces the solute to dissolve.

pressure = 1.18

volume of the gas in the syringe. we are estimating it to the nearest 0.5 mL is 43.5 mL.

Product of Pressure and volume is 51.3

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Answer:

Average atomic mass = 19.9 amu

Explanation:

Isotopes can be defined as two or more forms of a chemical element that are made up of equal numbers of protons and electrons but different numbers of neutrons.

Generally, the isotopes of a chemical element have the same chemical properties because of their atomic number but different physical properties due to their atomic weight (mass number).

Given the following data;

Relative abundance of Z-19 = 55%

Relative abundance of Z-21 = 45%

Atomic mass of Z-19 = 19 amu

Atomic mass of Z-21 = 21 amu

To find the average atomic mass;

Average atomic mass = 19 * (55/100) + 21 * (45/100)

Average atomic mass = 19*0.55 + 21*0.45

Average atomic mass = 10.45 + 9.45

Average atomic mass = 19.9 amu

Therefore, the average atomic mass for element Z is 19.9 amu.

Assuming the second plus sign is a typo and was meant to be a reaction arrow, this would be the balanced equation:

C3H8 + 5O2 —> 3CO2 + 4H2O

Answer: Industrial processes including mining and manufacturing historically have been leading causes of soil pollution. Industrial areas typically have much higher levels of trace elements and organic contaminants. This is due to intentional and unintentional releases from industrial processes directly into the environment, including to the soil, adjacent water bodies, and the atmosphere.

Explanation:

Answer:

Ether is the correct answer

Explanation:

It is based.

Answer:

True

Explanation:

They have four distinct stages: egg, larva (caterpillar), pupa (chrysalis), and adult. For monarch butterflies, it takes about a month to grow from an egg to an adult.

The life cycle of a frog consists of three stages: egg, larva, and adult.

Answer:

false butterfly's do not

When fossil fuels burn, several forms of energy are produced, including:

Heat energy: The primary form of energy released during fossil fuel combustion is heat. Fossil fuels contain chemical energy stored for millions of years, and when they burn, this energy is released in the form of heat. The heat energy can be harnessed for various purposes, such as heating buildings or generating steam to drive turbines.

Light energy: Burning fossil fuels can also produce light energy in the form of flames or glowing embers. This light energy is a byproduct of combustion.

Mechanical energy: Heat generated by burning fossil fuels can be converted into mechanical energy. This is typically achieved by using heat to produce steam, which drives a turbine connected to a generator. The rotating turbine converts the heat energy into mechanical energy, which is further transformed into electrical energy.

Electrical energy: Through the process described above, burning fossil fuels can ultimately generate electrical energy. The mechanical energy produced by the turbine is converted into electrical energy by the generator. Electrical energy can power various devices, appliances, industries, and infrastructure.

It's critical to note that while burning fossil fuels can produce useful forms of energy, it also results in the release of carbon dioxide and other greenhouse gases. This contributes to climate change and environmental concerns. As a result, there is a global shift towards cleaner and renewable energy sources to mitigate these negative impacts.

Answer:

1200

Explanation:

bc 12x20x5

Answer:

The volume of the rectaganle is 1200cm.

Explanation:

U take Length×width×height

so l×w×h = 12cm × 20 cm × 5cm

Mendeleev sketched out the table he had in mind. Mendeleev created the so-called Periodic Law while assembling these atomic data cards.

Periodic law is defined as a rule that the elements fall into recurrent groupings when enumerated in order of their atomic numbers, causing elements with similar qualities to appear frequently. "The physical and chemical properties of the elements are periodic functions of their atomic numbers," is how the current Periodic law is best summarized.

Mendeleev found that when all the known chemical elements were arranged in order of increasing atomic weight, the resulting table revealed a periodicity, or repeated pattern, of characteristics within groupings of elements.

Thus, Mendeleev sketched out the table he had in mind. Mendeleev created the so-called Periodic Law while assembling these atomic data cards.

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Answer:

B

Explanation:

Taking into account the definition of calorimetry, the specific heat of the unknown solid is 0.285 \(\frac{J}{gC}\).

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

So, the equation that allows to calculate heat exchanges is:

Q = c× m× ΔT

where:

Specific heat of the unknown solid

In this case, you know:

Replacing in the expression to calculate heat exchanges:

For unknown solid: Qsolid= csolid × 35 g× (26.5 - 100)°C

For water: Qwater= 4.186 \(\frac{J}{gC}\)× 50 g× (26.5 - 23)°C

If two isolated bodies or systems exchange energy in the form of heat, the quantity received by one of them is equal to the quantity transferred by the other body. That is, the total energy exchanged remains constant, it is conserved.

Then, the heat that the solid gives up will be equal to the heat that the water receives. Therefore:

- Qsolid = + Qwater

Replacing the corresponding expressions:

- csolid × 35 g× (26.5 - 100)°C= 4.186 \(\frac{J}{gC}\)× 50 g× (26.5 - 23)°C

Solving:

csolid × 2,572.5 g×°C= 732.55 J

csolid =732.55 J÷ 2,572.5 g×°C

csolid=0.285 \(\frac{J}{gC}\)

Finally, the specific heat of the unknown solid is 0.285 \(\frac{J}{gC}\).

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Answer:

C

Explanation:

Because they 2 or more atoms