a hydrogen atom absorbs radiation when its electron is excited to a higher energy level. stays in the ground state. makes a transition to a lower energy level. (b) is excited to a higher energy level.
(c) stays in the ground state.

Answer:

A). Arrow A shows the direction heat flowed because the temp of his hand increased as the heat was absorbed by his hand.

Explanation:

As per the given description, Eric can conclude that when 'heat is either prepended or separated from an object after the completion of his test' as arrow A displays the direction in which the heat has flown because his hands' temperature increased after the heat was absorbed by his hand. It implies that heat is prepended when the temperature of his hand increases and vice versa when the heat is removed. Thus, option A is the correct answer.

letter A is right.

your welcome

Answer:

Nutation

Explanation:

The counterclockwise rotation of planet earth around its own axis is defined as the Earth Rotation. The earth rotates about the line called "the axis of rotation," it is an imaginary line that passes through the North and South Poles of the planet, which the earth rotates about.

Hence, earth rotates once in about 24 hours with respect to the Sun, from West to East and thus giving rise to;

a. Day and night

b. Seasons

The Earth motion which describes the wobbling of the Earth around its precessional axis and could alter the amount of seasonal effects is known as nutation.

Basically, nutation usually occurs when the precessional motion of a planetary body such as planet earth experience some form of irregularities when it is rotating.

Litmus paper and Phenolphthalein are both indicators. This means they will change colour in the presence of an acid or a base.

Litmus paper turns blue in a base and remains red when it is in contact with an acid or neutral solution. Phenolphthalein turns pink in a base, but is coluorless in an acid or neutral solution.

The statement that best explains why the polarity of the H₂O molecule differs from the CO₂ molecule is B. The central atom in H₂O has lone pair electrons and the central atom in CO₂ does not.

The bonding in both the cases of Water and Carbon-di-oxide is polar,  that is O-H bond is polar and so is the C-O bond.

In a water molecule (H₂O), Oxygen is the central atom and it has lone pair of electrons. This makes the H₂O molecule asymmetrical and gives rise to polarity.

On the other hand in Carbon-di-oxide, Carbon is the central atom but it doesn't have a lone pair. The absence of lone pair gives rise to linear CO₂ molecules and hence dipole moment of each bond cancels each other. Hence, the bonds O=C=O have bonds canceled.

This makes the polarity of these two molecules to be different. Hence the statement that best explains the polarity of H₂O over CO₂ is B.

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Answer:

Physical property

Explanation:

We can visualize the property without the need to do any experiments.

The states of matter of the materials;

1) Dispersion forces - Yes

2) Hydrogen bonding - No

3) Ionic - No

4) Dispersion forces - No

5)  Dispersion forces - Yes

6) Ionic  - No

7) Hydrogen bonding - No

Sublimation is a physical process in which a substance transitions directly from its solid phase to its gaseous phase without passing through the intermediate liquid phase. In sublimation, the solid substance is heated, and the resulting gas molecules escape from the solid lattice structure without the need for melting.

One common example of sublimation is the process of dry ice. Dry ice is solid carbon dioxide (CO2) that sublimes at a temperature of -78.5 degrees Celsius (-109.3 degrees Fahrenheit). When dry ice is exposed to room temperature, it transitions directly from a solid to a gas, producing a fog-like effect.

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Answer:

25 atoms

Explanation:

Given data:

Total number of atoms = 400 atom

Atoms remain after 4 half lives passed = ?

Solution:

At time zero = 400 atom

At first half life = 400 atom/2 = 200 atom

At 2nd half life = 200 atom/2 = 100 atom

At 3rd half life = 100 atom/2 = 50 atom

At 4th half life = 50 atom/2 = 25 atom

Thus, 25 atoms are remained after 4 half lives.

25 atoms of the radioactive atoms will remain after 4 half lives.

    Given in the question,

Expression for the amount remaining of a radioactive element after 'n' half lives is given by,

\(N=N_0(\frac{1}{2})^n\)

Here, \(N_0=\) Initial amount

\(n=\) Number of half lives

By substituting the vales of \(N_0\) and \(n\) in the question,

\(N=400(\frac{1}{2})^4\)

   \(=\frac{400}{16}\)

   \(=25\)

        Therefore, 25 atoms of the radioactive atoms will remain after 4 half lives.

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Silicon contains 14 electrons and thus, its electronic configuration is written as follows:

1s², 2s², 2p⁶, 3s², 3p².

The filling of electron in different orbitals of an atom is called electronic configuration of the element. The electrons fill from the lowest energy levels to highest energy level.

The atomic number of an element is the number of its electron in its atomic state. Silicon is 14th element in periodic table. Hence, silicon contains 14 electrons.

The capacity of s orbital is 2 and that of p orbital is 6. Thus the electronic configuration of silicon can be written as: 1s², 2s², 2p⁶, 3s², 3p².

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Your question is incomplete but your complete question was as follows:

Si,  express your answer in complete form in the order of orbital filling as a string without blank space between orbitals.

Explanation:

2,2,4,4tetramethyl pentane

91.4 grams mass of KCl is required.

Concentration = moles/Volume

2.45M=mol/0.5L

2.45M⋅0.5L=mol

mol=1.225

Convert no. of moles to grams using the atomic mass of K + Cl

1.225mol⋅(39.1+35.5)/gmol

1.225mol⋅74.6g

mol=1.225⋅74.6g = 91.4g

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Answer:

2.01% to the nearest hundredth.

Explanation:

Percent error =[ (8.96-8.78) / 8.96]* 100

= 0.020089 * 100

= 2.0089 %

The Percent error is 2.01% to the nearest hundredth.

Suppose the actual value and the estimated values after the measurement are obtained. Then we have:

Error = Actual value - Estimated value

To calculate percent error, we will measure how much percent of actual value, the error is, in the estimated value.

\(\rm Percent \: Error = |\dfrac{Error}{Actual value}|\times 100 \\\\\)

\(Percent \: Error = | \dfrac{\text{(Actual Value - Estimated Value)}}{Actual value}|\times 100 \\\)

(here |x| is such that it makes x non negative, thus, |-5| = 5, and |5| = 5)

WE have been given a cube of pure copper when you calculate the density using your measurements, you get 8.78 grams/cm3. Copper's accepted density is 8.96 g/cm3.

Percent error =[ (8.96-8.78) / 8.96]* 100

= 0.020089 * 100

= 2.0089 %

Hence, the Percent error is 2.0089 %.

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The reaction of the hydrogen and the chlorine atoms would lead to the formation of HCl

In this reaction, each chlorine molecule (Cl2) breaks apart into two chlorine atoms (Cl), and each hydrogen molecule (H2) breaks apart into two hydrogen atoms (H). These reactive atoms then combine to form hydrogen chloride molecules (HCl).

It's worth noting that the reaction between hydrogen gas and chlorine gas is highly exothermic and releases a significant amount of energy.

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Given that we want to prepare a 10% solution of sodium hydroxide in 200 mL, we need to calculate the mass of sodium hydroxide required to make this solution.

We can use the following formula to calculate the mass of solute required to make a given volume and concentration of solution:

The density of solid NaOH is 2.13 g/mL. So, the density of sodium hydroxide solution is:

Sodium hydroxide, also known as lye and caustic soda or caustic soda, is an inorganic compound with the chemical formula NaOH. This compound is an ionic compound in the form of a white solid composed of the sodium cation Na⁺ and the hydroxide anion OH⁻. Sodium hydroxide is a building block that can also be found in detergents and oil stain removers. We use it to make products clean better by influencing the formula molecules, so they work better together.

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The density of the unknown material is 0.213 ml/g

The apparent density of the unknown material is calculated as follows;

Volume of the unknown substance = 126 ml - 102 ml = 24 ml

Density of the unknown substance = mass/volume

Density of the unknown substance =  24 ml / 112.6 g

Density of the unknown substance = 0.213 ml/g

Thus, the density of the unknown material is 0.213 ml/g

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Answer: D and A

Explanation: D cuz you need water to have good soil and A cuz you get better soil if its warm. (:  ( 'u' ) ( 'U' )

Answer:

B. Amount of snot the tissue can hold

Explanation:

In this specific scenario, the dependent variable would be the amount of snot the tissue can hold. That is because this is what Justin is trying to measure, which is also dependent on the type of tissue which would be the independent variable in this scenario. The different types of tissues can absorb different amounts of snot and this is what Justin ultimately wants to determine.

Answer:

C. 1 cubic foot of loose sand

Explanation:

For many  objects having equal volume , surface area will be maximum

of the object which has spherical shape .

But when a sphere is broken into tiny small spheres , total surface area of all the small spheres will be more than surface area of big sphere .

Hence among the given option , surface area of loose sand will have greatest surface area . Loose sand is equivalent to small spheres .

Answer:

the answer would be C 1 cubic foot of loose sand.

Answer:

It's A

Explanation:

Animals get the nitrogen they need by eating plants or other animals that contain nitrogen. When organisms die, their bodies decompose bringing the nitrogen into soil on land or into ocean water. Bacteria alter the nitrogen into a form that plants are able to use.

The length of the hydrocarbon tail of a fatty acid, which is a carboxylic acid with a lengthy hydrocarbon tail ranging from 3 to 30 carbon atoms, affects the melting point of saturated fatty acids.

A substance's temperature at which it transforms from a solid to a liquid is known as its melting point (or, less frequently, liquefaction point). The equilibrium between the solid and liquid phases exists at the melting point.

An organic substance called a hydrocarbon is made completely of hydrogen and carbon. Group 14 hydrides include things like hydrocarbons. Hydrocarbons often lack colour, are hydrophobic, and have faint smells. The equilibrium between the solid and liquid phases exists at the melting point.

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The required correct answer is option D) Te.

An atom of Tellurium (Te) has 52 electrons and its electron configuration is 1s22s22p63s23p64s23d104p65s24d105p4. It has six electrons in its outermost shell and it requires two more electrons to complete its octet. Upon gaining two electrons, the electron configuration of Te will become 1s22s22p63s23p64s23d104p65s24d105p6.Te (Tellurium) is a chemical element with an atomic number of 52. It is a rare, silvery-white metalloid that is widely used in various industries. The majority of tellurium is used in alloys and as an additive to copper, steel, and lead to increase their strength and durability. It's also used in the production of solar panels and other electronic devices.

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Answer:c

Explanation:

As the combined mass of the HCl and NaOH is 15 grams before the reaction. Therefore the mass after the reaction will be 15 grams according to the law of conservation of mass. Therefore, option (C) is correct.

Matter can be transformed form via physical changes and chemical changes from one form to another form, during any of these changes, the total mass is conserved. The same quantity of matter exists before and after the chemical or physical as none of the matter is created or destroyed.

The balanced equation between the reaction of HCl and NaOH:

\(HCl +NaOH \longrightarrow H_2O +NaCl\)

According to the law of conservation of mass, the mass of HCl and NaOH will be equal to the mass of the products water and NaCl.

As mentioned in the question the combined mass of HCl and NaOH measured before the reaction is 15 grams. Therefore, the mass of the products in the closed container will be equal to 15 grams as well.

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Your question was incomplete,  most probably the complete question was,

Fernando places 15 ml of HCl and 50 ml of NaOH in 100 ml of a beaker. He places them on a scale together and measures the combined mass of 15 grams.

After the HCl and NaOH react, Fernando measures the mass again. Using the mass before the reaction, what is the mass after the reaction? Remember, It is in a closed system.

A. 5.00 grams

B. 10.00 grams

C. 15.00 grams

D. 20.00 grams

lanation:    

ExpErnest Rutherford’s experiments involving the interaction of radiation with a magnetic or electric field (Figure 2) helped him determine that one type of radiation consisted of positively charged and relatively massive α particles; a second type was made up of negatively charged and much less massive β particles; and a third was uncharged electromagnetic waves, γ rays. We now know that α particles are high-energy helium nuclei, β particles are high-energy electrons, and γ radiation compose high-energy electromagnetic radiation. We classify different types of radioactive decay by the radiation produced.

Alpha (α) decay is the emission of an α particle from the nucleus. For example, polonium-210 undergoes α decay:

210

84

Po

⟶

4

2

He

+

206

82

Pb

or

210

84

Po

⟶

4

2

α

+

206

82

Pb

Answer:

Strip

Explanation:

Strip mining removes Earth in long strips from the top to reveal the coal. This earth to be removed is known as 'overburden'. The overburden from the first strip is referred to as out-of-pit dumping. Strip mining is a part of surface mining.

Strip mining destroys forests, landscapes, forests and wildlife habitats as trees and plants are removed from the mining area.

Therefore,

this describes the Strip coal mine.

Answer:

strip Mining.

Explanation:

According to the ideal gas law, the relationship between the pressure, volume, and temperature of a gas is given by the equation PV = nRT, where P is the pressure of the gas, V is the volume of the gas, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature of the gas in Kelvin.

If we have 2.9 L of gas at a pressure of 5.0 atm and a temperature of 50.0 °C, we can calculate the temperature of the gas if we decrease the volume of the gas to 2.4 and decrease the pressure to 3.0 atm by rearranging the ideal gas law equation as follows:

T = (PV) / (nR)

In this equation, T represents the temperature of the gas, P represents the pressure of the gas, V represents the volume of the gas, n represents the number of moles of gas, and R represents the ideal gas constant.

Plugging in the values from the problem into the equation, we get:

T = (5.0 atm * 2.9 L) / (n * 0.08206 L*atm / mol*K)

T = (14.5 L*atm) / (n * 0.08206 L*atm / mol*K)

T = (14.5 L*atm) / (n * 0.08206 L*atm / mol*K)

T = 177.2 K

Therefore, if we have 2.9 L of gas at a pressure of 5.0 atm and a temperature of 50.0 °C, and we decrease the volume of the gas to 2.4 and decrease the pressure to 3.0 atm, the temperature of the gas will be 177.2 K.

Answer:

you did not posted the series

Explanation:

Answer:

4.97097

Explanation:

You traveled 4.97097 mph.

**The breakdown of the ideal gas law at high pressures** occurs due to the **intermolecular forces** becoming significant and the **volume of gas particles** becoming significant compared to the total volume of the gas.

The ideal gas law, PV = nRT, assumes that gas particles are point masses with negligible volume and that there are no intermolecular forces between them. However, at high pressures, the volume occupied by the gas particles becomes significant, and the intermolecular forces start to affect their behavior. The ideal gas law fails to account for these factors, leading to deviations from its predictions. Real gases tend to deviate from ideal behavior under high-pressure conditions, necessitating the use of alternative equations, such as the van der Waals equation, to accurately describe their properties.

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