A. Lithium and cadmium are in the mixture. Strontium is not in the mixture.B. Lithium and strontium are in the mixture. Cadmium is not in the mixture.C. Cadmium and strontium are in the mixture. Lithium is not in the mixture.D. All of the shown elements are present in the mixture.

Answer:

The answer is steam of fossil fuels

Answer: I believe it is artificial selection (not certain though)

Explanation: modern day dogs have been bread an domesticated to be used by humans in ways we see fit.

Non-heme iron is found in some foods that provide all the amino acids humans require for the absorption of iron.

Amino acids are defined as the substances which are considered to be the monomers of proteins.Every amino acid has the same structure  which consists  of a central carbon  bonded to an amino group , carboxyl group and a hydrogen.

Each amino acid also has  an another atom or a group of atoms bonded to the alpha carbon which are also known as the R group or the variable group of the side chain.There are 20 common amino acids which are  present in natural proteins and each amino acid has the same backbone.

The sequence and number of amino acids determines protein's shape,size and also its function. Each amino acid is attached to the other by a covalent bond formed by a dehydration reaction.

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Nuclear fusion is the process that creates chemical elements lighter than iron. Helium is created when two hydrogen atoms join in a star at a speed that is almost as fast as light.

A material is considered an element if it cannot be divided into two or maybe more simpler compounds by any kind of chemical process, including the use of light or heat. For instance, when a piece of gold is melted, the gold element still melts and is there.

The lightest element is hydrogen. Helium is created when two hydrogen atoms join in a star at a speed that is almost as fast as light. The star keeps doing this until there are no more hydrogen atoms available. When this occurs, the star produces Beryllium by fusing the Helium atoms. When the helium runs out Carbon is created by combining Beryllium in the star. This procedure keeps going until the star produces iron. The star then explodes. Our dwellings and buildings are made out of all those atoms.

Therefore, nuclear fusion is the process that creates chemical elements lighter than iron.

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Answer:

well done. I hope it's helpful

Explanation:

density= mass/v

density of Al= 40.5 gram/ 18mL

= 2.25 gr/mL

Answer: here is my explination hope this is relavent. and helps to your question. i love chemistry

Answer:

Reactivity increases down the group

Explanation:

This is because metals reaction involves loss of an electron from an occupied orbital.

As we go down the group the relative nuclear charge decreases due to an additional orbit leading to ease in loss of an electron

Due to ease in loss of electrons down the group metals become more reactive down the group

The power required by the "active Na⁺ pumping" system to produce this flow against the +25 mV potential difference is approximately 4 × 10⁻¹⁷ W.

To calculate the power required by the "active Na⁺ pumping" system, we need to consider the current (rate of ion movement) and the potential difference across the axon. Power is given by the equation:

Power = Current × Voltage

Given:

Current (I) = 5 × 10⁻⁷ mol/(m²·s)

Voltage (V) = +25 mV = +25 × 10⁻³ V (since 1 mV = 10⁻³ V)

To determine the power, we need to convert the current to amperes (A) and multiply it by the voltage:

I (in A) = Current × elementary charge (e)

e = 1.6 × 10⁻¹⁹ C (charge of an electron)

Now we can calculate the power:

Power = I × V

First, let's convert the current from mol/(m²·s) to A/m²:

I (in A/m²) = Current (in mol/(m²·s)) × Avogadro's number (Nₐ) / time (s)

Nₐ = 6.022 × 10²³ mol⁻¹ (Avogadro's number)

Now, we can calculate the power:

Power = I (in A/m²) × V (in V)

Note: We assume the axon is a cylinder with a circular cross-section.

Given:

Length of axon (L) = 10 cm = 0.1 m

Diameter of axon (d) = 20 μm = 20 × 10⁻⁶ m

To calculate the cross-sectional area (A) of the axon, we use the formula for the area of a circle:

A = π × (d/2)²

Now, we can calculate the power:

Power = I (in A/m²) × V (in V) × A (in m²)

Substituting the given values:

A = π × (20 × 10⁻⁶ / 2)² = π × 100 × 10⁻¹² m²

Power = (5 × 10⁻⁷ A/m²) × (25 × 10⁻³ V) × (π × 100 × 10⁻¹² m²)

Simplifying the expression:

Power ≈ 4 × 10⁻¹⁷ W

Rounding to one significant figure, the power required by the "active Na⁺ pumping" system to produce this flow against the +25 mV potential difference is approximately 4 × 10⁻¹⁷ W.

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The higher the concentration of OH- ions, the more basic the solution becomes.Finally, a solution is considered to be neutral if the concentration of H+ ions and OH- ions are equal. In this case, the pH value of the solution is 7.

The concentration of hydrogen ions (H+) and hydroxide ions (OH-) determine whether a solution is acidic, basic or neutral. The pH scale ranges from 0 to 14. If the pH value of a solution is less than 7, it is acidic. If the pH value is greater than 7, it is basic. If the pH value is equal to 7, it is neutral.A solution is considered to be acidic if it has a higher concentration of H+ ions and a lower concentration of OH- ions. In an acidic solution, the concentration of H+ ions is greater than the concentration of OH- ions. The higher the concentration of H+ ions, the more acidic the solution becomes.On the other hand, a solution is considered to be basic if it has a lower concentration of H+ ions and a higher concentration of OH- ions. In a basic solution, the concentration of OH- ions is greater than the concentration of H+ ions. The higher the concentration of OH- ions, the more basic the solution becomes.Finally, a solution is considered to be neutral if the concentration of H+ ions and OH- ions are equal. In this case, the pH value of the solution is 7.
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provided evidence for the existence of Neutrons

within the nucleus.

James Chadwick's experimental work in 1932

After conducting experiments for just two weeks, Chadwick produced a report in February 1932 titled "The Possible Existence of a Neutron" in which he made the argument that the neutron, not gamma ray photons, was the most likely explanation for the unexplained radiation.

James Chadwick, an English physicist, wasn't able to establish its reality until 1932. Instead of using gold foil, Chadwick modified Rutherford's experiment by using a sheet of beryllium and a paraffin block. He made the proton-sized neutral particle, today known as the neutron, in the process.

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Answer:

um i think 20

Explanation: because 20

Nitrous acid has the chemical formula HNO2. To determine the number of oxygen atoms in 15 mg of nitrous acid, we need to first calculate the number of moles of nitrous acid in 15 mg. The molar mass of nitrous acid is 47.013 g/mol.

Therefore, 15 mg of nitrous acid is equivalent to 0.000319 moles. In one molecule of nitrous acid, there are two oxygen atoms. Thus, the number of oxygen atoms in 15 mg of nitrous acid would be 0.000319 moles multiplied by 2 oxygen atoms, which is equal to 0.000638 oxygen atoms. Therefore, there are approximately 0.000638 oxygen atoms in 15 mg of nitrous acid.
To find the number of oxygen atoms in 15 mg of nitrous acid (HNO2), first determine the number of moles of nitrous acid. Nitrous acid has a molar mass of 1(H) + 14(N) + 16(O) * 2 = 47 g/mol. Divide the mass by the molar mass: 15 mg / 47 g/mol = 0.00032 mol (convert mg to g).

Now, find the moles of oxygen atoms in nitrous acid. Each molecule of HNO2 has 2 oxygen atoms. So, 0.00032 mol HNO2 * 2 = 0.00064 mol of oxygen atoms.

Finally, calculate the number of oxygen atoms using Avogadro's number (6.022 x 10^23 atoms/mol): 0.00064 mol * 6.022 x 10^23 atoms/mol = 3.85 x 10^20 oxygen atoms in 15 mg of nitrous acid.

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The weather in an area is affected mostly by interactions between solar radiation, Earth's large ocean, diverse landscapes and motion in space.

Temperature, pressure, wind, humidity, and precipitation are known as the elements of weather and these factors are fundamental to describe the weather and climate of a particular region.

Weather and climate are influenced by interactions involving sunlight,  ocean, atmosphere, ice, landforms and living things. These interactions change with latitude, altitude, and local and regional geography, and all of which can affect oceanic and atmospheric flow patterns.

Factors that combine to influence the weather are solar radiation, amount of which changes with Earth's tilt, orbital distance from sun and latitude, temperature, air pressure and abundance of water.

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Answer:

No, it is not an example of a mutation.

Explanation:

Mutations occur in the chromosomes of the organism, in this case the fly. A mutation is a permanent alteration in the DNA of the fly. Therefore, if the fly were to have purple wings when it was born then it would be a mutation. However, in this case we dyed the wings of the fly purple. This does not alter or change the DNA in any way to cause a mutation.

Hope this helps!!

- Kay

Hg3PO4

Best way of trying to explain this is to find the valency, cross and cancel.

Mercury Symbol is Hg Valency 1 from Roman Numeral in Bracket.

Phosphate is a complex ion symbol PO4 with valency 3.

Cross over the valencies and cancel the 1 to get Hg3PO4.

Answer: 31161.9 J

Explanation:

liquid water For example, the limited temperature range of liquid water (0°C–100°C) severely limits its use. Aqueous solutions have both a lower freezing point and a higher boiling point than pure water.

How hot (or energetic) a substance or radiation is can be quantified by a physical value called temperature.

There are three different types of temperature scales: those like the SI scale that are defined in terms of the average translational kinetic energy per freely moving microscopic particle, like an atom, molecule, or electron in a body; those that only rely on strictly macroscopic properties and thermodynamic principles, like Kelvin's original definition; and those that are defined by actual empirical properties of particulates rather than by theoretical principles.

Temperature is gauged using a thermometer. It is calibrated using a variety of temperature scales that historically defined themselves using various reference points and thermometric materials. The most widely used scale is the Celsius scale, previously called as "centigrade."

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Answer:

b

Explanation:

The processes represented by chemical equations that are endothermic are:

Option A is an endothermic process because it requires heat input for the reaction to occur. Option B and C are also endothermic processes because they require heat input for the reaction to occur.

Option D is an exothermic process because it releases energy as the water molecules are converted into hydrogen and oxygen molecules. Meanwhile Option E is not a chemical reaction but a physical change known as sublimation. It does not involve a change in enthalpy.

The enthalpy change of a chemical reaction determines whether it is endothermic or exothermic. An endothermic reaction requires the input of energy while an exothermic reaction releases energy.

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A force that resists motion when objects touch is friction. Frictional force is the force that prevents an object from moving.

The term friction is defined as the force that opposes the motion of a solid object over another. There are four types of friction that are static friction, sliding friction, rolling friction, and fluid friction.

Three factors in particular determine the frictional force between two bodies: The adhesion between body surfaces, the surface roughness, and the deformation of bodies are all factors.

Frictional force is the force that prevents an object from moving. The imperfections on the two surfaces in contact are what produce friction. The type of surfaces in contact affects friction.

Thus, A force that resists motion when objects touch is friction.

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One example of particles that can be drawn closer to occupy a smaller volume is a gas.

In the gaseous state, particles have high kinetic energy and are not strongly attracted to each other. They move freely and randomly, colliding with each other and the container walls.

Since there are minimal intermolecular forces holding them together, gas particles can be compressed or drawn closer together by reducing the volume of the container.

By decreasing the volume of a gas, such as by compressing it in a cylinder or container, the particles have less space to move around. They collide with each other more frequently, increasing the frequency of intermolecular collisions. As a result, the gas particles are drawn closer together, and the overall volume occupied by the gas decreases.

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Answer1234

Explanation:

James chadwick discovered this particle neutron also neutrino called as is last of the subatomic particles to be characterized.

In 1932 james chadwick announced that the core also contained a new uncharged particle, which he called the neutron. neutron is also called neutrino he proved the existence of neutrons elementary particles devoid of any electrical charge. james chadwick was an English physicist who was awarded the 1935 Nobel prize in physics for his discovery of the neutron in 1932.

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Answer:

Explanation:

The kinetic energy of molecules is related to their temperature, and at a given temperature, all molecules, polar or non-polar, have the same average kinetic energy. The difference between polar and non-polar molecules lies in their intermolecular forces. Polar molecules have dipoles (separation of charge) due to differences in electronegativity of the atoms within the molecule. These dipoles cause the polar molecules to have stronger intermolecular forces, such as dipole-dipole forces and hydrogen bonding, compared to non-polar molecules which only have weak van der Waals forces.

At 100 K, the kinetic energy of both polar and non-polar molecules is low. However, polar molecules are more likely to be attracted to each other due to their stronger intermolecular forces. This means that polar molecules may have lower kinetic energy compared to non-polar molecules at the same temperature, because they may be more likely to be held together by these forces.

In terms of which group of molecules has greater intermolecular forces, it would be the polar molecules due to the presence of dipoles and the resulting stronger intermolecular forces. However, it's important to note that intermolecular forces can vary greatly within each group of molecules, depending on the specific molecule and its structure.

As per Raoult's law the vapor pressure of the solution is given by the term as 0.39 torr, option C.

François-Marie Raoult, a French chemist, discovered during an experiment that when chemicals were combined in a solution, the solution's vapour pressure reduced concurrently. Raoult's law was named in his honour.

Adding a solute decreases vapour pressure because the extra solute particles will fill the spaces left by the solvent particles and occupy space, according to a study of the ideas of collab-rative characteristics. This results in a reduced vapour pressure because there will be less solvent on the surface and less solvent that may escape to enter the gas phase. There are two methods to illustrate how Raoult's Law operates: a straightforward visual method and a more complex one based on entropy. Here is the straightforward method.

According to Raoult's law, a solution's partial pressure equals the sum of its mole fraction of solute and its partial pressure of pure solvent.

Hence;

Partial pressure of the pure solvent =  20.57 torr

Moles of water,

= 500 g/18 g/mol

= 27.8 moles

Moles of ethanol,

= 25.0 g/46 g/mol

= 0.54 moles

Total number of moles = 27.8 moles + 0.54 moles = 28.34 moles

Partial pressure of solution

= 0.54 moles/28.34 moles x 20.57 torr

= 0.39 torr

Therefore, the vapor pressure is 0.39 torr.

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To inflate the baggie with a volume of 836 milliliters using nitrogen gas at a pressure of 1.05 atm and a temperature of 301 K, we can apply the ideal gas law. Using the equation PV = nRT and rearranging it to solve for the number of moles (n), we find that n = PV / RT, which yields approximately 0.08757 moles of nitrogen gas. By multiplying this value by the molar mass of nitrogen (28.02 g/mol for N₂), we can determine the mass of nitrogen gas needed, which comes out to be approximately 2.453 grams. Thus, around 2.453 grams of nitrogen gas are required to inflate the baggie to the desired volume.

To determine the mass of nitrogen gas needed to inflate the baggie, we can use the ideal gas law equation:

PV = nRT

Where:

P = Pressure = 1.05 atm

V = Volume = 836 mL = 0.836 L (converted from milliliters to liters)

n = Number of moles of gas (what we want to find)

R = Ideal gas constant = 0.0821 L·atm/(mol·K)

T = Temperature = 301 K

Rearranging the equation, we can solve for the number of moles (n):

n = PV / RT

n = (1.05 atm * 0.836 L) / (0.0821 L·atm/(mol·K) * 301 K)

n = 0.08757 mol (rounded to 5 decimal places)

Now, we can calculate the mass of nitrogen gas using the molar mass of nitrogen (N₂):

Molar mass of N₂ = 2 * atomic mass of nitrogen (N)

Atomic mass of N = 14.01 g/mol

Molar mass of N₂ = 2 * 14.01 g/mol

Molar mass of N₂ = 28.02 g/mol

Finally, we can calculate the mass of nitrogen gas (m) using the number of moles (n) and the molar mass (M):

m = n * M

m = 0.08757 mol * 28.02 g/mol

m = 2.453 g (rounded to 3 decimal places)

Therefore, approximately 2.453 grams of nitrogen gas are needed to inflate the baggie.

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Answer:

37.1

Explanation:

mass of reactant side must be equal to mass of product side