Question 38 (1 point)
Electrons are repelled by what subatomic particle?
b
Other electrons, because they have a like charge.
Protons because they have a positive charge.
Neutrons because they do not have a charge.
Quarks because they are smaller than electrons.

Jacinda Ardern got involved with Tonga after the eruption due to the following reasons:

The correct answer is: 2, 3, and 4.

Jacinda Ardern, the Prime Minister of New Zealand, got involved with Tonga after the underwater volcanic eruption that occurred in January 2022.

There were several reasons why she got involved:

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Complete question:

Which of these are the reasons why Jacinda Ardern got involved with Tonga after the eruption?

1. the desire to preserve ocean resources in the area through satellite monitoring

2. the desire to get rid of the ash plume that threatens to cover New Zealand

3. the desire to acquire more information about the volcano's current activity

4. the desire to provide assistance to the people of Tonga by giving them provisions

3 and 4

2, 3 and 4

1 only

O 1 and 2

Answer:

A precipitate will be formed

Explanation:

The Ksp equilibrium of Fe(OH)₃ is:

Fe(OH)₃ (s) ⇄ Fe³⁺(aq)+ 3OH⁻(aq)

And its expression is:

Ksp = 4x10⁻³⁸ = [Fe³⁺] [OH⁻]³

Where the concentrations are concentrations in molarity in equilibrium,

We can write Q as:

Q = [Fe³⁺] [OH⁻]³

Where [] are actual concentrations in molarity of each specie.

When Q>= Ksp; a precipitate is formed,

When Q< Ksp no precipitate is produced:

[OH⁻] = [NaOH] = 1.0x10⁻⁴M

[Fe²⁺] = 2.50x10⁻²g * (1mol / 179.85g) / 0.100L = 1.39x10⁻³M

179.85g/mol is molar mass of Fe(NO₃)₂ and the volume of the solution is 0.100L = 100mL

Q = [Fe³⁺] [OH⁻]³

Q = [ 1.39x10⁻³] [ 1.0x10⁻⁴]³

Q = 3.8x10⁻¹⁵

As Q >> Ksp; A precipitate will be formed

Answer:

B. Fission

Explanation:

On edge

Answer:

mass number

Explanation:

Answer and Explanation: The value closest to the mass of an atom is its mass number. The mass number is the total count of the protons and neutrons in the nucleus of the...

mass number

hope that helped

The polarity of 6 real molecules are given below,

O2- Neutral

HF- Acidic

H2O- Neutral

NH3- Basic

CF4-Nonpolar

CH3F-  Polar

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The properties of the given element, Pb, is as follows:

The periodic table is an arrangement of the elements in increasing order of atomic number.

The atoms of elements are composed of three sub-atomic particles;

The element Lead, Pb,  is a metallic element found in the periodic table and has an atomic number of 82 and an average atomic mass of 207.2

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Objective: To compare the efficacy of topical minoxidil 5% alone and combined topical minoxidil 5% and fractional laser in the treatment of male androgenic alopecia and detection of any side effects occurring with each line of treatment.

Patients and Methods: This prospective randomized comparative controlled study was conducted for one year on 40 patients with male androgenic alopecia attending our Patient. Patients were classified into two groups: Group A received minoxidil alone (minoxidil group) and group B where patients received minoxidil plus fractional CO2 laser.

Results: In groups A and B, there was a statistically significant improvement between the clinical assessment scale at baseline and after 1 month (p<0.001). Also, there was a statistically significant improvement between the clinical assessment scale after 1 month and after 3 months (p=0.002). In group A, there was a statistically significant improvement between the clinical assessment scale at baseline and after 1 month, however, there was no statistically significant improvement between the clinical assessment scale and after 3 months. In group B, there was a statistically significant improvement between the clinical assessment scale at baseline and after 1 month, however, also, there was a statistically significant improvement between the clinical assessment scale and after 3 months.

Conclusion: Our study revealed the superiority of combination therapy, using a fractional laser and 5% minoxidil, over 5% minoxidil alone, for the treatment of male AGA, with no serious adverse effects of treatment identified.

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Answer:

The answer is d-block.      

Explanation:

like the other person said.

The metal sphere was made of a substance with a specific heat capacity of 4,512.48J/kg-K.

Calculate the total heat energy required to raise the temperature of the metal sphere:

Q = mc∆T

Where m is the mass of the metal sphere (0.5 kg), c is the specific heat capacity (unknown), and ∆T is the change in temperature (300 oC - 20 oC = 280 oC).

Q = (0.5 kg)(887 J/kg-K)(280 oC)

Q = 125,160 J

Calculate the total heat energy required to raise the temperature of the mercury:

Q = mc∆T

Where m is the mass of the mercury (4.08 kg), c is the specific heat capacity of mercury (0.14 J/g-K), and ∆T is the change in temperature (99 oC - 20 oC = 79 oC).

Q = (4.08 kg)(0.14 J/g-K)(79 oC)

Q = 4,512.48J/kg-K

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Answer:

The answer is "\(1.4 \ \bold{ billion-years}\)".

Explanation:

Using formula:

\(\to N_{Now} = N_{orige}e^{\lambda t} \\\\\)

\(\to\) 1 U atom produces 1 Pb atom after decay.

\(\to\) U's original numbers are now the sum of U counts and Pb counts.

 \(\to N_U=(N_U+N_{pb})e^{\lambda Ut}\)

\(\to 1 = (1+3) \ exp[(\frac{-\ln(2)}{t_{(half)}} \times t ]\\\\\to t = [\frac{\ln(4)}{\ln(2)}] \times t_{(half)}\)

      \(= 14 \times 10^8 \ \ years\\\\=1.4 \ billion \ \ years\)

Answer:

uhh its 497 miles

Explanation:

The heat is given out when 85g of lead cools from 200  °C to 10  °C the specific heat of lead is 0.11 J/g °C is 1776.5 J

The specific heat expression is given as :

Q = mc ΔT

Where,

Q = heat

m = 85 g

c =  0.11 J/g °C

ΔT = 200 °C  - 10 °C

     = 190 °C

Q = mc ΔT

Q = 85 × 0.11 × 190

Q = 1776.5 J

Thus, The heat is given out when 85g of lead cools from 200  °C to 10  °C the specific heat of lead is 0.11 J/g °C is 1776.5 J

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In nature, most double bonds of fatty acids are in the cis formation, but after hydrogenation many have been converted to trans formation.

Yes, that is correct. The cis formation of double bonds in fatty acids is more common in nature due to the geometric arrangement of the atoms, as it allows for the most efficient packing of atoms.

However, when hydrogen is added to the double bond, the geometric arrangement of the atoms changes, converting the cis formation to a trans formation. This process is known as hydrogenation, and it is used to increase the stability and shelf life of fatty acid compounds.

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The complete reaction would be; 2 NaCl --> 2 Na + Cl2 + H

Energy is released when an exothermic process continues in the form of heat, light, or sound. In this way, the reactants' chemical bonds initially hold the energy, which is later released as the bonds are broken and new ones are formed.

Heat or other forms of energy are released as a result of the energy differential between the reactants and the reaction's products. In an exothermic process, energy is assumed to be on the side of the products.

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Hello there!

Your answer is C.

Answer:

The right option is; A. It is younger than the rock layer below.

Explanation:

A rock layer deposited on top of another rock layer is younger than the rock layer below. This is based on the law of superposition which states that in any undeformed sequence of rocks that are laid down in layers, the youngest layer of rock will be on top of the sequence, while the oldest layer will be at the bottom of the sequence.

Answer:

concentration = mol/volume = 4/2 = 2M

Superficial frostbite is a second-degree frostbite (a type of injury) and results in clear skin blisters.

Frostbite is damage of skin due to cold temperatures. The victim of frostbite is mostly unaware of it because a frozen tissue is numb. It can be cured but depends upon the stages of frostbite. There are three stages of frostbite as given below:

First stage is Frostnip, cause loss of feeling in skin occurs. Skin color becomes red and purple.

Second stage is Superficial Frostbite, cause clear skin blisters. Skin color changes from red to paler. A fluid-filled blister may appear 24 to 36 hours after color changing of skin

Third stage is Deep Frostbite, cause joints or muscles no longer work. Skin color changes to black and the area turns hard.

Redness or pain in any skin area maybe the first sign of frostbite.

Thus, when weather is very cold, stay indoors or dress in layers to prevent serious health problems.

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Superficial frostbite is a type of frostbite that affects the outer layers of the skin and results in localized damage to the skin and underlying tissues. It is considered a mild form of frostbite and usually affects the fingers, toes, ears, nose, and cheeks.

The symptoms of superficial frostbite can include numbness, tingling, stinging, and burning sensations in the affected area. The skin may also appear pale or waxy and may be hard to the touch. In some cases, blisters may form several hours after rewarming the affected area.

If treated promptly and properly, superficial frostbite usually heals without complications. However, if left untreated, it can progress to deeper layers of tissue, leading to more severe frostbite and potential tissue damage.

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Answer:

Molecular solids and covalent network solids are two types of solid compounds. The key difference between molecular solid and covalent network solid is that molecular solid forms due to the action of Van der Waal forces where as covalent network solid forms due to the action of covalent chemical bonds.

hope this helps

Option (E) is correct. The density in ka/m of a rock of mass 1.80 kg and volume 6.0x 10 m is 3 * \(10^{3}\) kg/m. It can be written in various equivalent terms.

Density is defined as the substance's mass per unit of volume. It is the relationship between the mass of the substance and how much space it takes up that means volume. The mass of atoms, their size, and how they are arranged determined by the density of a substance. The term density is equals to the mass of the substance divided by its volume.

         ρ = m/ v

We have to find the density in ka/m of a rock of mass 1.80 kg and volume 6.0x 10 m.

here, m = 1.80 kg

         v = 6.0x 10 m.

putting the values we get,

ρ = 1.80 kg / 6.0x 10 m

   = 3 * \(10^{3}\) kg/m

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The complete question is,

The density of a material is equal to its mass divided by its volume. What is the density in ka/m of a rock of mass 1.80 kg and volume 6.0x 10 m'?

A. 3x 10' kg/m

B. 3.0x 10' kg/m

C. 3.00 x 10' kg/m

D. 3.000 x 10 kg/m

E. Any of these- all of these answers are mathematically equivalent

To accurately classify the changes in the PhET simulation's effect on the wavelength, a description of the available changes and their respective bins is necessary In general, changes that can affect the wavelength in a wave simulation include adjusting the frequency, amplitude, speed, or medium properties.

Each of these changes can have a specific effect on the wavelength of the wave. For example, increasing the frequency generally results in a shorter wavelength, while decreasing the frequency leads to a longer wavelength. Similarly, altering the amplitude may not directly affect the wavelength but can impact the intensity or energy of the wave.

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Secondary consumers are organisms that primarily feed on herbivores or other primary consumers.

They occupy the next trophic level above the primary consumers in a food web. They obtain energy by consuming the primary consumers and play an important role in regulating the population of herbivores.

Examples of commonly observed secondary consumers include:

Carnivorous mammals: Animals such as wolves, lions, and tigers that feed on herbivores like deer, zebras, or gazelles.

Birds of prey: Species like eagles, hawks, and owls that consume small mammals, reptiles, or other birds.

Carnivorous fish: Fish like pike, barracuda, or bass that prey on smaller fish or aquatic invertebrates.

Predatory insects: Insects such as spiders, mantises, or dragonflies that feed on other insects, including herbivorous insects.

In a specific food web, the identification of secondary consumers would depend on the specific organisms present and their feeding interactions. It would be necessary to analyze the trophic relationships among the organisms in the food web to determine the secondary consumers accurately.

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A pressure saucepan, also known as a pressure cooker, reduces cooking time by increasing atmospheric pressure inside the cooking vessel. This is achieved by sealing the pot tightly and trapping steam generated from boiling liquids and food. The increased pressure raises the boiling point of water, allowing food to cook at higher temperatures than normal. Options 1 and 3 are correct.

Option 1: Increasing atmospheric pressure is correct because the sealed pressure cooker traps steam, which increases the pressure inside the pot. The increased pressure raises the boiling point of water, resulting in faster cooking times.

Option 2: Decreasing atmospheric pressure is incorrect because pressure cookers work by increasing pressure, not decreasing it.

Option 3: Increasing vapor pressure is correct because as the pressure inside the pressure cooker increases, the vapor pressure of water also increases. This higher vapor pressure enables the food to cook more rapidly.

Option 4: Decreasing vapor pressure is incorrect because the pressure cooker actually increases the vapor pressure by raising the overall pressure inside the pot.

Option 5: Ionizing the added salt is unrelated to the operation of a pressure cooker and does not contribute to the reduction in cooking time.

Hence, a pressure saucepan reduces cooking time by increasing the atmospheric pressure and vapor pressure inside the pot.

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Answer: A.

Explanation:

Brownian motion is the random motion of a particle as a result of collisions with surrounding gaseous molecules. Diffusiophoresis is the movement of a group of particles induced by a concentration gradient. This movement always flows from areas of high concentration to areas of low concentration.

Example:  The movement of pollen grains on still water. Motion of dust motes in a room (though largely influenced by air currents).

Answer:

All of them derive from a common ancestor. They each share something in their DNA that ties into their past selves, which were more closely related. As they evolved, they became more and more distant, but we can still trace them back to the olden days.

Also they all have scales.

Hope this was at least semi-useful.

Answer:

7

Explanation:

Bec g1 has to lose one electron and g7 has to gain one electron

Polymerase chain reaction (PCR) is a technique used to amplify (copy) DNA. Here are the main answers to the questions asked above:1. After one PCR cycle, there will be two molecules of dsDNA.2. After three PCR cycles, there will be eight molecules of dsDNA.3.

After 30 PCR cycles, there will be approximately ~1 billion molecules of dsDNA.4. A. PCR is an efficient technique with the potential to produce a large amount of DNA.Explanation:1. After one PCR cycle, there will be two molecules of dsDNA.During the initial denaturation step, the DNA double helix is split into two strands by heat. The temperature is then reduced to 50-60°C, and the primers bind to the complementary single-stranded DNA templates.The polymerase enzyme, Taq DNA polymerase, then extends the primers, creating two new DNA strands that are complementary to the original strand.2.

After three PCR cycles, there will be eight molecules of dsDNA.Each new double-stranded DNA molecule produced in cycle 1 now serves as a template for cycle 2, resulting in 4 new double-stranded DNA molecules. As a result, after cycle 2, there are four double-stranded DNA molecules. Cycle 3 uses these four molecules as a template to produce eight molecules of double-stranded DNA.3. After 30 PCR cycles, there will be approximately ~1 billion molecules of dsDNA.There will be roughly 2³⁰ or approximately ~1 billion molecules of dsDNA.4. A. PCR is an efficient technique with the potential to produce a large amount of DNA.

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It has 8 valence electrons.

The valence electrons in each family of elements are:

Boron, Carbon, and Neon are elements that belong to different families.

Boron and Carbon are members of the Carbon family, while Neon is part of the Noble gas family.

They have a varying number of valence electrons.Boron has three valence electrons in its outermost shell.

Carbon has four valence electrons in its outermost shell.

Neon has eight valence electrons in its outermost shell.

Hence, the number of valence electrons in Boron, Carbon, and Neon are 3, 4, and 8, respectively.

Also, we can say that each family of elements has a specific number of valence electrons that help to determine their chemical and physical properties.

The number of valence electrons can be easily found using the Group number of the element in the periodic table.

The Group number of an element represents the number of valence electrons an element has.

For example, Boron and Carbon are present in Group 13 and Group 14, respectively, which means they have 3 and 4 valence electrons.

Neon, on the other hand, is present in Group 18, and it has 8 valence electrons.

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Answer:

\(\large \boxed{\text{299.4 g}}\)

Explanation:

We will need a chemical equation with masses and molar masses, so, let's gather all the information in one place.

Mᵣ:        44.10                          44.01

              C₃H₈   +   5O₂   ⟶   3CO₂   +   4H₂O

m/g:  100.00

To solve a stoichiometry problem, you must

1. Moles of C₃H₈

\(\text{Moles of C$_{3}$H}_{8} = \text{100.00 g C$_{3}$H}_{8} \times \dfrac{\text{1 mol C$_{3}$H}_{8}}{\text{44.10 g C$_{3}$H}_{8}} = \text{2.268 mol C$_{3}$H}_{8}\)

2. Moles of CO₂

The molar ratio is 3 mol CO₂:1 mol C₃H₈

\(\text{Moles of CO}_{2} = \text{2.268 mol C$_{3}$H}_{8} \times \dfrac{\text{3 mol CO}_{2}}{\text{1 mol C$_{3}$H}_{8}} = \text{6.803 mol CO}_{2}\)

3. Mass of CO₂

\(\text{Mass of CO}_{2} = \text{6.803 mol CO}_{2} \times \dfrac{\text{44.01 g CO}_{2}}{\text{1 mol CO}_{2}} = \textbf{299.4 g CO}_{2}\\\text{The mass of CO$_{2}$ required is $\large \boxed{\textbf{299.4 g}}$}\)

Answer:

Number of moles of propane:

=Mass in grams ÷ Relative molecular Mass

= 100/((12*3) + (1*8))

= 100 ÷ 44

= 2.2727

Mole ratio propane:carbon (IV) oxide = 1:3(from the equation)

Number of moles of CO2 = 3*2.2727 = 6.8181

Mass in grams = Relative molecular Mass * Number of moles

= 44 * 6.8181

= 299.9964 grams

Explanation:

According to the question the isotopic atomic mass of 24Mg is 24.233 amu.

Isotopes are atoms that have the same number of protons but different numbers of neutrons. They have different atomic masses but are chemically identical. Isotopes occur naturally in all elements, and some are even artificially produced in laboratories. As the number of neutrons in an atom increases, the atomic mass of the isotope also increases.

24Mg: 78. 70% * 24.985 amu = 19.622 amu

25Mg: 10. 13% * 25.986 amu = 2.613 amu

26Mg: 11. 17% * 26.983 amu = 2.998 amu

Total: 24.233 amu

Therefore, the isotopic atomic mass of 24Mg is 24.233 amu.

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