hcfc refrigerants are: a) more harmful to the stratospheric ozone than cfcs b) as harmful to stratospheric ozone as cfcs c) less harmful to stratospheric ozone than cfcs d) not harmful to stratospheric ozone

Answer:

They were created in the Earth's core.

The rest make no sense

Answer:

the number of protons determines the atomic number

Explanation:

Ex. Aluminum has 13 protons, so it's atomic number is 13

hope this helps :)

Answer:

there will be less and less space

Explanation:

Answer:

Frequency = 6.16 ×10¹⁴ Hz

λ = 4.87×10² nm

Explanation:

In case of hydrogen atom energy associated with nth state is,

En =  -13.6/n²

For n = 2

E₂ = -13.6 / 2²

E₂ = -13.6/4

E₂ = -3.4 ev

Kinetic energy of electron = -E₂ = 3.4 ev

For n = 4

E₄ = -13.6 / 4²

E₄ = -13.6/16

E₄ = -0.85 ev

Kinetic energy of electron = -E₄ = 0.85 ev

Wavelength of radiation emitted:

E = hc/λ = E₄ - E₂

hc/λ = E₄ - E₂

by putting values,

6.63×10⁻³⁴Js × 3×10⁸m/s / λ = -0.85ev   - (-3.4ev )

6.63×10⁻³⁴ Js× 3×10⁸m/s / λ = 2.55 ev

λ = 6.63×10⁻³⁴ Js× 3×10⁸m/s  /2.55ev

λ = 6.63×10⁻³⁴ Js× 3×10⁸m/s  /2.55× 1.6×10⁻¹⁹ J

λ = 19.89 ×10⁻²⁶ Jm / 2.55× 1.6×10⁻¹⁹ J

λ = 19.89 ×10⁻²⁶ Jm / 4.08×10⁻¹⁹ J

λ = 4.87×10⁻⁷ m

m to nm:

4.87×10⁻⁷ m ×10⁹nm/1 m

4.87×10² nm

Frequency:

Frequency = speed of electron / wavelength

by putting values,

Frequency = 3×10⁸m/s /4.87×10⁻⁷ m

Frequency = 6.16 ×10¹⁴ s⁻¹

s⁻¹ = Hz

Frequency = 6.16 ×10¹⁴ Hz

the number of hydroxyl groups increases is caused by a greater degree of hydrogen bonding between the molecules.

I hope this helps

All of the following statements about a hybrid zone are true. None of the given statement is false.

What is a hybrid zone?

The geographical regions where two distinct species or populations interact and cross-breeding occurs is called a hybrid zone and the organisms produced in such regions are called hybrid species.

These populations differentiate genetically and produce off springs having mixed characteristics of ancestry.

Moreover, a hybrid zone may undergo several changes overtime due to environmental changes.

In general, hybrid zones are in site locations where a new lineage is formed as a result of evolution.

Distinct changes that take place in a hybrid zone over time are reinforcement, fusion and stability.

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Answer:

Refractive index

Heat capacity

Density

Explanation:

Properties that are used to identify materials are called intensive properties. These intensive properties are characteristic of the material and does not depend on the amount of material present.

Thus, if i want to identify whether the three bars are made of the same metal, i can look out for the following properties;

Refractive index

Heat capacity

Density

These properties are intensive properties thus they can be used to identify an unknown substance.

Answer:

We attach when we are convinced that we are incapable of healing ourselves or giving ourselves what we really want and need.

Explanation:

Hope you get right

The answer is d) the volume ratios of gaseous reactants and products.                                                                                          

While the coefficients in a balanced chemical equation provide information about the mole ratios of reactants and products and the ratios of the number of molecules of reactants and products, they do not provide information about the volume ratios of gaseous reactants and products. This is because the volume of a gas can vary depending on temperature, pressure, and other factors.
However, they do not directly convey mass ratios, as different substances have different molar masses, which must be considered separately.

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The total pressure of the gas is calculated as 849 mmHg.

The term partial pressure is the pressure that is exerted by an individual gas in a mixture of gases.

In this case, the partial pressures of hydrogen and water are 789 mmHg and  60 mmHg respectively.

Thus, the total pressure of the gas =  60 mmHg +  789 mmHg = 849 mmHg.

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Answer:

Autosexuality means people are more attracted to themselves than to others and may prefer masturbation to sex with a partner.

Answer: autosexual people are people who are attracted to themselves rather than other people.

Explanation:

Answer:

D

Explanation:

Melting of ice is a physical change as there no new compound is forming only state is changing So Option D is correct option. For second question Option D is correct option as combustion reaction is taking place.

Chemical change is a reaction in which breaking and forming of new bonds take place. One molecule completely converted to totally different molecule. The number of atoms remains same

One famous example of chemical change is the rusting of iron. The color, odor and arrangements of atoms in products are very much different from reactant. Chemical change are mostly irreversible in nature.  Physical change is just opposite of chemical change. Phase change is an example of physical change.

Thus option D  is correct option in both cases.

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At a high altitude, water boils at a lower temperature than at sea level because the atmospheric pressure is lower. Option B

The atmospheric pressure decreases with increasing altitude because there is less air pressing against the water's surface.

When a liquid's vapor pressure reaches the same level as air pressure, boiling takes place. At sea level, the atmospheric pressure is 1 atm, hence for water to boil at 100°C, the vapor pressure must also be 1 atm. In contrast, the vapor pressure of water exceeds atmospheric pressure at lower temperatures at high elevations when the atmospheric pressure is lower.

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Answer:

37.8 Degrees Celcius is your answer.

thermal energy leads to an increase in the kinetic energy also increasing in temperature hope this helped!

Answer:

thermal energy leads to an increase in the kinetic energy also increasing in temperature This is known because temperature is in fact the measure of the average kinetic energy of the molecules.

Explanation:

hope this helps❤️

According to the balanced equation, 31.7 grams of nitrogen gas (N₂) reacting with excess hydrogen gas (H₂) will produce a 2.264 moles of ammonia gas (NH₃).

To determine the moles of ammonia formed, we need to convert the given mass of nitrogen gas to moles using its molar mass and the stoichiometric ratio of the balanced equation.

The molar mass of nitrogen gas (N₂) is 28.02 g/mol. To calculate the number of moles of nitrogen gas, we divide the given mass by its molar mass:

31.7 g / 28.02 g/mol = 1.132 mol

According to the stoichiometry of the balanced equation, the ratio between nitrogen gas and ammonia gas is 1:2. This means that for every 1 mole of nitrogen gas, 2 moles of ammonia gas are produced.

Therefore, using the stoichiometric ratio, we can determine the moles of ammonia formed:

1.132 mol N₂ * (2 mol NH₃ / 1 mol N₂) = 2.264 mol NH₃

Thus, upon the complete reaction of 31.7 grams of nitrogen gas with excess hydrogen gas, 2.264 moles of ammonia gas will be formed.

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Answer:

Just combine one 12-oz can of evaporated milk and 1-1/2 cups granulated sugar in a sauce pan. Bring the mixture to a boil over medium heat, stirring constantly. Continue cooking, until the sugar dissolves, and the milk thickens slightly. Allow your sweetened condensed milk to cool.

Explanation:

hope this helps

Answer:

Mix one 12-oz can of evaporated milk and 1-1/2 cups granulated sugar. :)

True, the natural pH of hair is between 4.5 and 5.5.

The pH scale measures the acidity or alkalinity of a substance, ranging from 0 (highly acidic) to 14 (highly alkaline), with 7 being neutral. Hair and the scalp have a slightly acidic natural pH level, typically falling within the range of 4.5 to 5.5. This acidity helps maintain the hair's integrity and protect it from damage.

Hair has a natural pH level of 4.5 to 5.5, making it slightly acidic. This acidity is important for protecting the hair and maintaining its structural integrity. Balancing pH levels in hair care products is crucial for healthy hair and scalp.

The statement is true - the natural pH of hair lies between 4.5 and 5.5, contributing to the overall health and protection of hair and scalp. It is essential to consider pH levels when choosing hair care products to maintain hair health.

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Answer:

the narrator means that before the universe was out forward to completion,

there were little things that came together to form other things

a typical example can be found in the big bang theory

Answer:The narrator is pointing out that energy is involved in every event, and each event can be described in terms of energy.

Explanation:

Answer:

produced continually by the impact of meteors falling onto its surface.

Explanation:

density = mass/volume

volume= mass/density

Yes, you're correct.

Answer:

Volume isn't equal to mass.

Explanation: Mass is weight, volume is like how much something can hold.

It gets basic

ie ph>7 for basic solutions

Answer:

b) a rubber tire

Explanation:

Answer: B - a rubber tire

Explanation: Rubber is an insulator

The ion channel associated with the NMDA receptor is permeable to calcium (Ca²⁺), while the ion channel associated with the AMPA receptor is permeable to sodium (Na⁺).

The NMDA receptor is a type of glutamate receptor found in the central nervous system (CNS) that plays a crucial role in synaptic plasticity and learning.

When glutamate, the primary excitatory neurotransmitter, binds to the NMDA receptor, it allows the influx of calcium ions (Ca²⁺) into the postsynaptic neuron.

Calcium entry through the NMDA receptor is important for long-term potentiation (LTP), a process involved in strengthening synaptic connections and facilitating learning and memory.

On the other hand, the AMPA receptor is also a type of glutamate receptor that mediates fast synaptic transmission in the CNS.

When glutamate binds to the AMPA receptor, it opens an ion channel that is permeable to sodium ions (Na⁺), leading to depolarization of the postsynaptic membrane and generation of an excitatory postsynaptic potential (EPSP).

This EPSP can trigger the firing of an action potential in the postsynaptic neuron, allowing for the transmission of signals between neurons.

Therefore, the NMDA receptor's ion channel allows the passage of calcium (Ca²⁺), while the AMPA receptor's ion channel permits the flow of sodium (Na⁺).

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Complete question here:

The ion channel associated with the NMDA receptor is permeable to ____ while the ion channel associated with the AMPA receptor is permeable to a. iron; sodium b. glutamate; potassium C. calcium, sodium and potassium; sodium d. calcium and selenium, potassium and sodium e. calmodulin; glutamate

The velocity of the car is 20 m/s. So, the correct option is  C. 20 m/s north.

To determine the velocity of the car, we need to calculate the displacement and divide it by the time taken.

The car initially moves 50 m south of the library and then ends up 250 m north of the library, resulting in a displacement of 250 m - (-50 m) = 300 m. The time taken is given as 15 seconds.

Therefore, the velocity can be calculated as displacement divided by time: 300 m / 15 s = 20 m/s.

Since the displacement is positive (from south to north), the velocity is also positive, indicating the car is moving north. Therefore, the correct answer is option C: 20 m/s north.

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Explanation:

Characteristics of Liquids

Liquids have definite volume, but indefinite shape. They are free to form droplets and puddles when they are not inside a container. When a liquid is inside a container, it will take its shape. Unlike gases, a liquid will not change its volume to spread out and completely fill a container.

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Answer:

C

Explanation:

Hope This Helps :)

Explanation:

Mass ratio C : H : N = 27.3 : 9.10 : 63.6

Mole ratio C : H : N = 27.3/12: 9.10/1 : 63.6/14

( Divide the mass ratio by their molar masses to find the ratio between moles)

Mole ratio = 2.275 : 9.10 : 4.54

= 2.275/2.275 : 9.10/2.275 : 4.54/2.275

= 1 : 4 : 2

Answer is CH4N2

The empirical formula of a compound is \(CH_4N_2\)

The empirical formula of a chemical compound is defined as the simplest whole number ratio of the atoms present in a compound.

The empirical formula of a compound defines the simplest ratio of the number of different atoms present. The molecular formula gives the actual number of each different atom present in a molecule. The molecular formula is mainly used which is a multiple of the empirical formula.

Molecular Formula  = n × Empirical Formula

For above given example,

Mass ratio C : H : N = 27.3 : 9.10 : 63.6

Mole ratio C : H : N = 27.3/12: 9.10/1 : 63.6/14

( We divide the mass ratio by their molar masses to find the ratio between moles)

Mole ratio = 2.275 : 9.10 : 4.54 = 2.275/2.275 : 9.10/2.275 : 4.54/2.275

= 1 : 4 : 2

Thus, the empirical formula of a compound is \(CH_4N_2\)

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Explanation:

During the breakdown of fatty acids, not all acetyl CoA enters the citric acid cycle, and your body converts some acetyl CoA to ketone bodies.

Acids are molecules or ions that can donate protons, known as Bronsted-Lowry acids, or form covalent bonds with electron pairs, known as Lewis acids. The first category of acids is proton donors or Brønsted-Lowry acids.

Blood is normally slightly alkaline, with a normal pH range of about 7.35 to 7.45. Normally, the body keeps blood pH near 7.40. Doctors measure a person's acid-base balance by measuring the pH of the blood and the levels of carbon dioxide (acid) and bicarbonate (base). No oil is either an acid or a base. Neutral. Oil is a neutral, nonpolar chemical. That is, it is a viscous liquid at room temperature. It is immiscible with water, but soluble in alcohol and ether.

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