The entire range of electromagnetic wave frequencies is known as ______.

A) visible light
B) ultraviolet
C) the electromagnetic spectrum
D) magnetism

Which of the following devices does NOT utilize radio waves?

A) cellular telephone
B) radar
C) satellite
D) television remote control


Which of the following describes a material that allows only some light to pass through?

A) diffuse
B) opaque
C) translucent
D) transparent

Answer is: electrons.

According to the Bohr model of the atom:

1. Electrons orbit the nucleus in orbits that have a set size and energy.

2. Energy levels of electrons are discrete (certain discrete values of energy).

3. Electrons can jump from one energy level to another, absorbing or emitting electromagnetic radiation with a frequency ν (energy difference of the levels).

The electron (symbol: e⁻) is a subatomic particle whose electric charge is negative one elementary charge.

Proton is a subatomic particle with a positive electric charge of +1e elementary charge.

Beside negatively charged electrons, atoms have positively charged protons, so atoms have neutral charge.

43 degrees

angle of reflection is equal to the angle of incidence

Answer:

Seeing The 50 N upwards and Ur mom meaning:

Explanation:

Ur Mom banged the 50 N

The names of the polyatomic ions match to their symbols as follows: Ammonium - NH₄⁺; Nitrate - NO₃¯; Phosphate - PO₄³¯; Hydroxide - OH¯. Polyatomic ions, which are ions comprising more than one atom, act as individual units in chemical reactions, and they must ensure electrical neutrality in the compounds they form.

In the question, you are required to match the names of different polyatomic ions with their correct symbols. The correct matching for this question is:

Ammonium - NH₄⁺

Nitrate - NO₃¯

Phosphate - PO₄³¯

Hydroxide - OH¯

Polyatomic ions are ions that consist of more than one atom, for instance, nitrate. They behave as a unit in a chemical reaction and have an overall charge.

They are quite common in chemistry and play significant roles in various chemical reactions. In simple ionic compound, electric neutrality is crucial, as seen in the example of calcium phosphate, Ca₃(PO₄)₂.

You determine the neutral charge by treating polyatomic ions as individual units. For instance, in calcium phosphate, the mineral in our bones, we have three calcium ions (Ca²⁺) for each two phosphate (PO₄³¯) groups.

As discreet units, the PO₄³¯ ion has one phosphorus atom and four oxygen atoms with a total charge of 3⁻. The compound is electrically neutral due to the total count of the atoms.

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The movement of charged particles cannot pass through an electrolyte to produce an electric current.

True

False

FALSE

Final answer:

The statement is false. option B

Explanation:

The statement that the movement of charged particles cannot pass through an electrolyte to produce an electric current is false. In fact, electrolytes are substances that can conduct an electric current when dissolved in water or when melted.

Electrolytes contain free ions that move in response to an electric field, which allows them to conduct electricity. For example, when table salt (sodium chloride) is dissolved in water or melted, it becomes an electrolytic solution with ions that readily move, completing an electrical circuit and allowing the current to flow.

Insulators, such as glass, are materials that do not allow charges to move through them effectively. In substances like solid sodium chloride or pure water, the ions are not free to move, making them poor conductors or insulators. However, when these substances are in the form of an electrolyte, the ions are free and mobile, and thus conductivity is observed.

The balanced equation is

4Fe(s) +  3O2(g)  ---> 2Fe2O3(s)

here four moles of Fe will react with O2 to give 2 moles of Fe2O3

mass of Fe reacted = 33.4 grams

moles of Fe reacted = mass of Fe / atomic mass of Fe

moles of Fe reacted = 33.4 / 55.8 = 0.599 moles

moles of Fe2O3 formed = 0.5 X 0.599 = 0.2995 moles

so mass of Fe2O3 formed = moles X molar mass = 0.2995 X 159.69 = 47.83 g

To determine the amount of iron(III) oxide produced, we used stoichiometry to relate the given mass of iron to the mass of  Fe₂O₃ produced via the balanced equation, resulting in the formation of 47.76 grams of  Fe₂O₃.

The student asked how many grams of Fe₂O₃  are formed when 33.4 g of Fe reacts completely with oxygen. We'll solve this by using stoichiometry based on the balanced chemical equation for the reaction between iron and oxygen:

4 Fe + 3 O₂ arr 2 Fe₂O₃

Firstly, we need to find the number of moles of iron:

Number of moles of Fe = mass of Fe / molar mass of Fe = 33.4 g / 55.85 g/mol

Calculate moles of Fe₂O₃  using the mole ratio from the balanced equation. As per the equation, 4 moles of Fe produce 2 moles ofFe₂O₃ . Therefore, the number of moles of iron will be halved to find the moles of  Fe₂O₃.

Finally, convert the number of moles of Fe₂O₃  to grams using its molar mass (55.85 g/mol for Fe and 16.00 g/mol for O, resulting in 159.7 g/mol for Fe₂O₃ ).

Using the above steps, the specific calculations are:

33.4 g Fe / 55.85 g/mol Fe = 0.598 moles Fe

0.598 moles Fe arr 0.598 / 2 = 0.299 moles

0.299 moles Fe₂O₃  × 159.7 g/mol Fe₂O₃ = 47.76 g  (rounded to two decimal places)

This means that 47.76 grams of Fe₂O₃ are formed when 33.4 grams of Fe reacts with oxygen.

The correct amount of HNO₃ needed to dissolve 11.45 g of Cu according to the equation is 98.9 grams.

To solve this problem, first, determine the molar mass of copper (Cu) and nitric acid (HNO₃). Copper has a molar mass of 63.55 g/mol, while nitric acid has a molar mass of 63.01 g/mol.

Next, calculate the number of moles of copper present in 11.45 g using its molar mass. This yields approximately 0.180 moles of Cu.

Now, use the stoichiometry of the balanced chemical equation to find the moles of nitric acid needed.

According to the equation, 3 moles of Cu react with 8 moles of HNO₃. Therefore, the moles of HNO₃ needed would be (8/3) × 0.180 = 0.480 moles.

Finally, convert moles of HNO₃ to grams using its molar mass. This gives 0.480 moles × 63.01 g/mol = 30.245 g.

However, this is the amount needed for 0.180 moles of Cu.

To find the amount needed for 11.45 g of Cu, we use the proportion: (30.245 g / 0.180 mol) × 11.45 g = 192.08 g.

The correct answer is 98.9 grams of HNO₃.

To dissolve 11.45 g of Cu, 31.92 grams of HNO₃ are needed.

Molar Mass Calculation:

Molar mass of Cu = 63.55 g/mol

Molar mass of HNO₃ = 63.01 g/mol

Moles of Copper:

[tex]\[ \text{Moles of Cu} = \dfrac{\text{Mass of Cu}}{\text{Molar mass of Cu}} = \dfrac{11.45 \, \text{g}}{63.55 \, \text{g/mol}} = 0.18 \, \text{mol} \][/tex]

Stoichiometry of the Reaction:

According to the balanced equation:

3 moles of Cu react with 8 moles of HNO₃.

Moles of HNO₃:

[tex]= \dfrac{8}{3} \times \text{Moles of Cu} \\= \dfrac{8}{3} \times 0.18 \, \text{mol} = 0.48 \, \text{mol} \][/tex]

Mass of HNO₃:

[tex]\[ \text{Mass of } HNO_3 = \text{Moles of } HNO_3 \times \text{Molar mass of }HNO_3\\ = 0.48 \, \text{mol} \times 63.01 \, \text{g/mol} \\= 31.92 \, \text{g} \][/tex]

The substances and their chemical formulas are: water (H2O), hydrogen ion (H+), hydronium ion (H3O), and hydroxide ion (OH-)

1. H+ matches with the chemical formula H2O, which represents water.

2. H2O matches with the chemical formula H2O, which represents water.

3. H3O matches with the chemical formula H3O, which represents the hydronium ion.

4. OH- matches with the chemical formula OH-, which represents the hydroxide ion.

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See , from the equation we can see that for forming two mole of H2O 2Mole of H2 has to react.

Mass of 2 Mole H2O is 18*2gm or 36gm.

So for forming 36 gm H2O 2×2 I.e. 4 gm H2 has to take part in reaction.

Therefore, to form 1 gm H2O 4÷36 gm of H2 has to take part.

So, for forming 47gm H2O (4÷36)×47 gm H2 has to take part

I.e. 5.22 gm of H2 has to take part

So, ans is 5.22 gm of hydrogen.

Hope it helps!!!

Answer: Mass of hydrogen gas that must react will be 5.22 grams.

Explanation:

To calculate the number of moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]   ....(1)

Given mass of water = 47 g

Molar mass of water = 18 g/mol

Putting values in above equation, we get:

[tex]\text{Moles of }H_2O=\frac{47g}{18g/mol}=2.61mol[/tex]

For the given balanced chemical equation:

[tex]2H_2+O_2\rightarrow 2H_2O[/tex]

By Stoichiometry of the reaction:

2 moles of water are formed from 2 moles of hydrogen gas.

So, 2.61 moles of water will be formed from [tex]\frac{2}{2}\times 2.61=2.61mol[/tex] of hydrogen gas.

Now, calculating the mass of hydrogen by using equation 1:

Moles of hydrogen gas = 2.61 moles

Molar mass of hydrogen gas = 2 g/mol

Putting values in equation 1, we get:

[tex]2.61mol=\frac{\text{Mass of hydrogen gas}}{2g/mol}\\\\\text{Mass of hydrogen gas}=5.22g[/tex]

Hence, mass of hydrogen gas that must react will be 5.22 grams.

Explain that argon has 18 protons and 18 electrons. There are 2 electrons on the first energy level, 8 electrons on the second level, and 8 electrons on the third energy level. Good luck!

Answer:

The sublayer that is likely to be filled after the rest of the subshells at a specific energy level will be the "s" layer.

Explanation:

The sublayer that is likely to be filled after the rest of the subcases at a specific energy level will be the "s" layer. This is explained by the Pauling diagram.

Linus Pauling Diagram or Electronic Distribution Diagram is a model that assists in the configuration of the electrons of atoms and ions through energy sublevels. This diagram is based on the energy sublevels of the atom to organize the electrons. These are arranged from lowest to highest energy when the atom is in its ground state. The electrosphere of atoms is formed by 7 (seven) electronic layers, represented by the letters: K, L, M, N, O, P and Q. Each layer allows a maximum number of electrons and each layer has a number of sublevels.

The K layer has only one sublevel (s), which allows up to 2 electrons. This sublayer will likely fill after the rest of the subshells at a specific energy level.

Compounds that are gases at room temperature are covalent bonds (nonmetal + nonmetal).

Final answer:

The state of a substance at room temperature is determined by the strength of intermolecular forces and molecular interactions. Carbon dioxide is a gas at room temperature because of weak intermolecular forces, whereas solids like metals have strong intermolecular forces that give them a definite volume and shape. Compounds exhibit different states under various temperature and pressure conditions.

Explanation:

The physical state of a compound like carbon dioxide at room temperature can be explained by its molecular structure and the interactions between its molecules. Carbon dioxide is a gas at room temperature because the forces between its molecules are relatively weak, allowing them to move freely and occupy the entire volume available to them.

On the other hand, solids at room temperature, such as metals, have strong intermolecular forces that keep their atoms or molecules close together in a fixed, orderly pattern, giving them a definite volume and shape. For a compound to be a liquid at room temperature, its boiling point must be higher than the room temperature, indicating stronger intermolecular forces than gases, but not as strong as solids, thus allowing the molecules to flow while remaining close together.

The state of compounds at room temperature is a significant physical property and is determined by molecular interactions and environmental conditions such as temperature and pressure. All substances can exist in solid, liquid, or gas states under different conditions. For example, carbon dioxide becomes dry ice when cooled to about -78°C, showcasing how temperature changes can alter the state of a substance.

Answer: D relative humidity

Explanation: Just took the test.

Relative Humidity is the amount of water vapor in air, as a percentage of the maximum amount the air could hold at the same temperature. The other options refer to different concepts in weather science and chemistry.

The amount of water vapor in the air, compared to the maximum amount that can be held at a specific air temperature is called Relative Humidity. This term is a measure used in weather science to describe the percentage of moisture in the air in relation to the maximum amount the air could hold at the same temperature.

For example, if the Relative Humidity is 50%, it means that the air is carrying 50% of the total moisture it could hold at that particular temperature.

Other options like Dew Point, Precipitation, and Crystallization refer to different concepts. Dew Point is the temperature at which the air is saturated and water vapor begins to condense into dew. Precipitation is any form of water particles, liquid or solid, that fall from the atmosphere and reach the ground. Crystallization is a process in chemistry involving the formation of solid crystals from a homogeneous solution.

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Answer : The kinetic energy is, [tex]3.716\times 10^{3}J/mol[/tex]

Explanation :

The formula for kinetic energy is:

[tex]K.E=\frac{3}{2}RT[/tex]

where,

R = gas constant = 8.314 J/mol.K

T = temperature = [tex]25.0^oC=273+25.0=298.0K[/tex]

Now put all the given values in the above kinetic energy formula, we get:

[tex]K.E=\frac{3}{2}\times (8.314J/mol.K)\times (298.0K)[/tex]

[tex]K.E=3.716\times 10^{3}J/mol[/tex]

Therefore, the kinetic energy is, [tex]3.716\times 10^{3}J/mol[/tex]

Answer:

Copper and Iron

Explanation:

Metals, like copper and iron, are good conductors of heat; that is because  metals are bounded by a 'cloud' of free electrons and these electrons can carry easily kinetic energy through the metal

On the other hand, foam and wood are isolators, that is, they are bad conductors of heat.

Answer:

B

Explanation:

Answer:

the answer is transition metals

Explanation:

98.857g Na

To find this, set up an equation as so:

4.3 mol Na = [tex]\frac{22.99g Na}{1 mol Na}[/tex]

Multiply everything on the top and divide that by everything on the bottom to get the final answer of 98.857g Na.

Hope this helps!

Hydrogen bonding, a particularly strong dipole-dipole force, causes a powerful attraction between water molecules, which results in a high boiling point.

Hey There,

When one nucleus after another is split,

C) A chain reaction begins

Best Of Luck,

- I.A. -

Answer: A chain reaction begins

Answer: the correct answer is

Explanation:

Electrons are the negatively charged particles present inside the atom revolving around the nucleus. These are the subatomic particles of an atom but along with this they also exhibit wave nature explained by french scientist De Broglie.

Photon is discrete packet of energy of an electromagnetic radiation.They exhibit both properties of wave and particle. Photons exhibit's particle nature in photoelectric effect and wave nature in interference experiments.

Hence, the correct answer is option (B).

3.56 times 10^8 i believe is your answer

3.56 × 10^8

1. Move the decimal to the left until it gets to a number below ten

2. Then count the number of times you moved it over

3. Multiply the first number you got (3.56) by 10 to the power of how ever many times you moved the deecjaml over.

It will look like this: 3.56 × 10^8

Gastrointestinal Tract. Radiation damage to the intestinal tract lining will cause nausea, bloody vomiting and diarrhea. This is occurs when the victim's exposure is 200 rems or more. The radiation will begin to destroy the cells in the body that divide rapidly.

Answer:

t should include correct results and not include the falsified results

Explanation:

Final answer:

The cell membrane regulates the movement of materials in and out of the cell through selective permeability and transport proteins.

Explanation:

The cell membrane is responsible for regulating the movement of materials in and out of the cell. It is selectively permeable, allowing some substances to pass through while blocking others. This selective permeability helps to maintain the internal environment of the cell and ensures the cell's survival.

Transport proteins in the cell membrane act as channels or pumps to facilitate the movement of specific molecules in and out of the cell. These proteins play a crucial role in maintaining the balance of salts, nutrients, and proteins within the cell.

An example of a transport protein is ion channels. Ion channels regulate the movement of ions such as sodium, potassium, calcium, and chloride across the cell membrane. These ions are essential for various cellular processes and maintaining membrane potential.

1.atoms

2.two

3. Elements are combined to make compounds

4.fewer

5. Larger  

6. Starch is made up of three Elements.

I’m not sure about the other two but I hope this helped!!

I believe your answer might be

D) About 550 million more people speak Mandarin than speak Hindi.

The correct answer is pahoehoe.  

The constituents generated in the volcanic eruptions are known as pyroclastic material. Of the given options pahoehoe is not considered as a pyroclastic material. It is a kind of lava flow of basaltic rock, generally dark-colored with a ropey or smooth surface. It is one of the two prime forms of lava flow discharged from volcanoes of the Hawaiian kind, the other is aa.  

Pahoehoe lava is a usual kind of basaltic lava, which cools down producing billowy, smooth, or ropy surfaces. Generally, it is produced by various small breakouts of lava from an over-crusted irregular, inflating flat flow.  

Pahoehoe, a type of basaltic lava with a smooth or ropy surface, is not considered a pyroclastic material. Pyroclastic materials are solid substances produced by volcanic eruptions which include ash, lapilli, and cinders.

Pyroclastic material, associated with volcanic eruptions, includes a variety of solid substances. These range from ash, which is the finest material, to lapilli, and cinders, larger and heavier particles. On the contrary, pahoehoe is not included in the category of pyroclastic materials. Instead, pahoehoe is a type of basaltic lava that has a smooth, billowy, or ropy surface. Therefore, pahoehoe is the option that is not considered a pyroclastic material from the choices given.

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The correct answer is option B, that is, add 1.46 grams of NaCl to 250 milliliters of H₂O.

First there is a need to find the moles of NaCl in 250 ml of 0.10 M NaCl,

Moles of NaCl = molarity × volume = 0.10 M × (250/1000L) = 0.025 mol

The corresponding mass of NaCl is,

Mass of NaCl = moles × molar mass = 0.025 mol × 58.5 g/mol = 1.46 g

Thus, there is a need to dissolve 1.46 grams of NaCl solid into 50 ml of H₂O and dilute to 250 ml.

The most appropriate procedure to prepare a 0.10 M NaCl solution with a volume of 250.0 mL is to dissolve 1.46 g of NaCl in 50 mL of water and dilute to 250 mL.

The most appropriate procedure to prepare a 0.10 M NaCl solution with a volume of 250.0 mL is option D. Dissolve 1.46 g of NaCl in 50 mL of H2O and dilute to 250 mL.

To determine the amount of NaCl needed, we can use the molarity formula:

Molarity = (moles of solute) / (volume of solution in liters)

Using the given molarity of 0.10 M and the volume of 0.250 L (250 mL), we can rearrange the formula to solve for moles of solute:

moles of solute = molarity * volume of solution

Substituting the values, we get:

moles of solute = (0.10 M) * (0.250 L) = 0.025 moles

And finally, we can calculate the mass of NaCl needed using the molar mass:

mass = moles of solute * molar mass

mass = (0.025 moles) * (58.4 g/mol) = 1.46 g

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Knowing the mass and radius of the Earth and the distance of the Earth from the sun, we can calculate the mass of the sun (right), again by using the law of universal gravitation. The gravitational attraction between the Earth and the sun is G times the sun's mass times the Earth's mass, divided by the distance between the Earth and the sun squared. This attraction must be equal to the centripetal force needed to keep the earth in its (almost circular) orbit around the sun. The centripetal force is the Earth's mass times the square of its speed divided by its distance from the sun. By astronomically determining the distance to the sun, we can calculate the earth's speed around the sun and hence the sun's mass.

Astronomers determine the gravitational force between celestial objects by observing their motion and applying Kepler's law together with the Doppler effect. This allows the calculation of the masses involved and hence gravitational forces. These methods work for celestial bodies near or far.

Astronomers determine the gravitational force between two celestial objects indirectly by using observations and mathematical laws. For example, by observing the orbits of stars close to the galactic center and using Kepler's third law, we can estimate the mass of a black hole in a far-off galaxy. Similarly, by measuring the orbital speed of gas in the rotating accretion disk of distant galaxies, we can calculate the gravitational force exerted by the central object.

The Doppler effect is another important tool in this process, which is used to measure radial velocities of the orbiting material and thus derive the speed at which it moves around. This speed tells us about the central body's gravitational force. Gravitational effects between two bodies also allow the calculation of masses of astronomical objects.

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