Astronauts must be protected from extreme heat while
reentering the Earth's atmosphere. Scientists can use the
engineering design process to help make reentry safer.
You have defined the problem as a need for heat shields to be stronger. What
should be your next step in using the engineering design process to solve the
problem?
O A. Communicate your solution to your team members.
O B. Update your initial design for the heat shield.
O C. Identify the criteria and constraints of the project.
O D. Build a prototype of a possible new type of heat shield.​

This problem is providing the atmospheric pressure at 2000 m altitude which is 560. mmHg and asks for this pressure in units of atmospheres, which after doing the calculations, the result is 0.737atm.

In this case, we can firstly define the concept of atmospheric pressure, also known as barometric pressure, as that pressure exerted by a column of air over a specific point in space at a defined altitude.

In order to get the correct conversion, we use the following equivalence statement relating mercury millimeters and atmospheres:

760 mmHg = 1 atm

Hence, the required conversion turns out to be:

\(560.mmHg*\frac{1atm}{760mmHg}=0.737atm\)

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B. Photons are absorbed and reemitted.

D. Photons are scattered in many directions.

From the core, gamma rays move into the radiative zone where they are transferred by radiation. As the gamma rays move through the radiative zone, they interact with surrounding atoms and transfer energy to those atoms. As a result, gamma rays become less energetic and become other types of photons. These photons are absorbed and re-emitted by the surrounding atoms, molecules, and electrons, and are scattered in different directions.

Here's a photo of the Edge review just incase.

The energy is transferred through the radiative zone of the Sun is " energy is transferred through the large-scale movement of material and photons are scattered in many directions".

Energy can be defined by scientists as just the capability to perform. People had also learned how to convert transformed from one medium to another and use that to conduct work, making modern civilization conceivable.

A photon is just a fundamental particle that must be a quantum of the electromagnetic field, which includes electromagnetic radiation including light, radio waves, as well as the electromagnetic force's force component.

Therefore, the energy is transferred through the radiative zone of the Sun is " energy is transferred through the large-scale movement of material and photons are scattered in many directions"

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Answer:

6116g

Explanation:

2SO2(g) + O2(g) + 2H2O(ℓ) −→ 2H2SO4(ℓ)

We want to find the mass in grams of SO2 that is needed to react with 1527 g of O2. First we must convert the grams of O2 to moles of O2 then to moles of SO2 and then to grams of SO2

So first lets find the molar mass of O2

The mass of oxygen according to a periodic table is 15.999

Using this the mass of O2 would be 15.999(2) = 31.988g

Next we need to identify the mole ratio of O2 to SO2

Looking at the equation for 1 mole of O2 there are two moles of SO2

Next we need to find the molar mass of SO2

Again the mass of oxygen is 15.999g and the mass of Sulfur is 32.066

So the mass of SO2 would be 15.999(2) + 32.066 = 64.064g

Now that we have found all the needed conversions :

We can now use dimensional analysis to calculate the answer.

Kindly check the attached image to see the table. ( sorry if its a bit blurry )
Explanation : The conversions are used to cancel out the units to get to the final unit which is gSO2.

Once the units are cancelled out except for the gSO2 we mutliply and divide based off of what the table says to do.
Here first we divide 1527 by 31.988. We than multiply by 2. Finally we multiply by 64.064 to get the final answer which is 6116gSO2

Answer:

Please find the complete question and its solution in the attached file:

Explanation:

Based on the data shown in the graph, the rate of reaction is directly proportional to the temperature of a reaction.

The speed at which a chemical reaction occurs is called the reaction rate or rate of reaction. The rate of a reaction is proportional to the increase in product concentration per unit time and the decrease in reactant concentration per unit time.

The rate of a reaction is affected by the following:

the temperature of the reaction - the rate of reaction is directly proportional to the temperature of a reaction. Hence, the rate of a reaction increases with an increase in temperature.

presence of a catalyst - the rate of a reaction increases with the addition of a catalyst. A catalyst speeds up the rate of a reaction.

the surface area of the reactants - the rate of a reaction increases with an increase in the surface area of the reactants,

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Answer:

At higher temperatures, chemical reactions occur more quickly.

Explanation:

edmentum

Answer:

The concentration of the copper (II) sulfate solution is 2.06 * 10^2 μmol/L or 2.06 * 10^2 μM

Explanation:

The concentration of a solution is the amount of solute dissolved in a given volume of solution. In this case, the concentration of the copper(II) sulfate solution in micromoles per liter (symbol ) is the number of micromoles of copper(II) sulfate dissolved in each liter of solution. To calculate the micromoles of copper(II) sulfate dissolved in each liter of solution you must divide the total micromoles of solute by the number of liters of solution.

Here's that idea written as a formula: c= n/V

where c stands for concentration, n stands for the total micromoles of copper (II) sulfate and V stands for the total volume of the solution.

You're not given the volume of the solution in liters, but rather in milliliters. You can convert milliliters to liters with a unit ratio: V= 150. mL * 10^-3 L/ 1 mL = 0.150 L

Next, plug in μmol and liters into the formula to divide the total micromoles of solute by the number of liters of solution: c= 31 μmol/0.150 L = 206.66 μmol/L

Convert this number into scientific notation: 2.06 * 10^2 μmol/L or 2.06 * 10^2 μM

According to Newton's Third Law of Motion, The force the child applies on the boat same force that is applied to the child.

The third regulation states that for every movement (force) in nature there is the same and contrary reaction. If item A exerts a force on object B, object B also exerts an identical and contrary force on item A. In different phrases, forces result from interactions.

The swimmer whilst swimming pushes in opposition to the pool wall along with his feet and in return hurries up (swims) inside the course contrary to that of his push. Newton's third law of motion states that for each movement, there may be the same and contrary reaction.

The third law states that for each motion (pressure) in nature there is a same and contrary reaction. If object A exerts pressure on item B, object B also exerts an identical and contrary pressure on object A.

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This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97. The incorrect representation for a neutral atom is 36Li

To determine the correct representation for a neutral atom, we need to consider the atomic number (Z) and mass number (A) of the element. The atomic number represents the number of protons in the nucleus, while the mass number represents the sum of protons and neutrons.

Let's analyze the given representations:

36Li:

This representation suggests that the element is lithium (Li) with a mass number of 36, which is incorrect. The correct mass number for lithium is approximately 6.94.

613C:

This representation suggests that the element is carbon (C) with a mass number of 13, which is correct. Carbon has different isotopes, and 13C represents one of its stable isotopes.

3063Cu:

This representation suggests that the element is copper (Cu) with a mass number of 63, which is correct. Copper has different isotopes, and 63Cu represents one of its stable isotopes.

1530P:

This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97.

Therefore, the incorrect representation for a neutral atom is 36Li, as it does not match the known properties of lithium.

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The response that includes all the items listed below that are pure substances is: B. 2, 4.

In chemistry, a substance is a type of matter that has a specific composition and distinct chemical and physical properties. It is a form of matter that cannot be separated into other types of matter by physical means, such as filtration or distillation. A substance can be either an element or a compound. An element is a type of substance made up of only one type of atom, such as gold, oxygen, or carbon. A compound, on the other hand, is a substance made up of two or more different elements that are chemically combined in a fixed ratio, such as water or carbon dioxide.

Here,

Both steam and oxygen are pure substances. Steam is composed of water molecules, which are a compound with the chemical formula H2O. Oxygen is an element and is composed of molecules with the chemical symbol O2.

Orange juice, ocean water, and vegetable soup are not pure substances because they are mixtures of different compounds and/or elements. Orange juice is a mixture of water, sugars, acids, and other compounds found in oranges. Ocean water is a mixture of water, salts, and other dissolved substances. Vegetable soup is a mixture of water, vegetables, and other ingredients.

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x in  Na₂CO₃.xH₂0  is the number of water molecule that is attached to sodium carbonate called water of crystallization. Therefore the value of x is 10

Titration is a technique by which we know the concentration of unknown solution using titration of this solution with solution whose concentration is known. To know the end point we use phenolphthalein as indicator. End point is a point where completion of reaction happen

The balanced equation is

Na₂CO₃ + H₂SO₄ → Na₂SO₄ + H₂O + CO₂

Concentration of H₂SO₄= 0.05 mol/L

Volume of H₂SO₄ = 20 ml = 0.02 L

number of moles of H₂SO₄= 0.05× 0.02 = 0.001mol

number of moles of H₂SO₄ = n(Na2CO3) = 0.001 mol

Molar mass of Na₂CO₃= 106 g/mol

mass of Na₂CO₃ = n× M = 0.001 × 106 = 0.106g

change in mass =∆m = 0.276 – 0.106 = 0.17 g

Molar mass of (H₂O = 18 g/mol

n umber of moles of water = mass÷ Molar mass=0.17 g÷18=0.0094mol

x= number of moles of H₂O÷ number of moles of sodium carbonate

 = 0.0094mol÷0.001

  =10

Therefore the value of x is 10

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Answer:

I think the dish contracts and shrinks

Answer:

The dish cracks or breaks.

Explanation:

When glass changes temperature rapidly, it may undergo thermal shock. This is stress that is produced by a sudden change in temperature.

The new volume of the gas is 56.6 liters when the temperature is raised to 325 K and the pressure is lowered to 1.2 atm.

PV = nRT

Where R is the ideal gas constant. Since the number of moles is constant in this problem, we can simplify the ideal gas law to:

P1V1/T1 = P2V2/T2

Where the subscripts 1 and 2 refer to the initial and final states of the gas, respectively.

We can now plug in the given values for the initial state of the gas:

P1 = 2.3 atm

V1 = 25 L

T1 = 299 K

And the given values for the final state of the gas:

P2 = 1.2 atm

T2 = 325 K

We can then solve for V2:

P1V1/T1 = P2V2/T2

(2.3 atm)(25 L)/(299 K) = (1.2 atm)V2/(325 K)

V2 = (2.3 atm)(25 L)(325 K)/(1.2 atm)(299 K)

V2 = 56.6 L (rounded to three significant figures)

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Answer: gravity wind and water density or surface currents

Explanation:

Hope this helped

Answer:

92.4%

Explanation:

The volume per cubic meter of sodium preoccupy by the sodium ions is

\(V_{Na} = n \times V\)

where;

volume (V) of each Na atom   = \(\dfrac{ 4}{3} \pi r^3\)

Radius of each ion = 97.3 pm = 97.3 × 10⁻¹²

no.of atoms in the sample n =  mass of the sample / ( molar mass / NA)

mass of the sample per cubic metre =  911 kg/m³

∴

\(V = \bigg [ \dfrac{4}{3} \pi r^3 \bigg ] \bigg [\dfrac{MN_A}{m} \bigg ]\)

\(V = \bigg [ \dfrac{4}{3} \pi (97.3 \times 10^{-12} )^3 \bigg ] \bigg [\dfrac{ (911 kg/m^3 (m^3))(6.023\times 10^{23})}{27.7 \times10^{-3}\ kg/mol } \bigg ]\)

V = 0.07643 m³

The fraction of available conduction electrons are;

= (1 - V)

= 1 - 0.07643

= 0.92357

≅ 92.4%

A: begin to cool and daylight hours decrease.

Plants go through seasonal changes from summer to fall because of the changes in temperature and the length of daylight hours. As summer ends and fall begins, temperatures begin to cool down and the days become shorter. This change in temperature and daylight hours triggers physiological changes in plants, such as the slowing down of growth and the production of pigments like anthocyanins, which give leaves their characteristic red and orange colors in the fall. These changes allow the plant to prepare for the colder winter months and conserve energy for the upcoming spring growth season.

Answer:

a. begin to cool and daylight hours decrease

hope this helps ;)

Answer:

2.41x10²¹ atoms

Explanation:

mass of nickel that are present in the coin can be determined Using ( 25% nickel) with j mass of coin= 0.942g )

mass of nickel = (0.942g) × (25/100)

= 0.2355g of Nickel

We need to convert this " gram" into " moles"

Mole= mass/ molar mass

Molar mass= 58.69 g/mol

0.2355 g) / (58.69 g/mol)

= 0.004 mol

We need to convert the moles to

number of atoms.

Avogadro's number= 6.023x10²³ atoms/mol

(0.004 × 6.023x10²³ atoms/mol)

=2.41x10²¹ atoms

Answer:

Explanation:

Here, we want to get the net ionic equation of the given reaction

In reality, the given reaction produces silver chloride precipitate

Thus, the net reaction equation we would be writing is one that would give the silver chloride

We have this as:

Answer:

because I want to save life

According to the question, the declaration that best illustrates the cart is as follows:

Thus, the correct option for this question is C.

Velocity may be defined as a type of vector quantity that significantly determines the rate of alteration of the position of an object with respect to time.

According to the context of this question, the cart was migrating at a persistent velocity as a straight line which is significantly mentioned in the graph given above.

The rate through which the location and position enhance is directly proportional to the time. For example, when time increases, the distance or position also increases. So, it was migrating at a persistent velocity.

Therefore, the correct option for this question is C.

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Answer:

Some places have more earthquakes than others because they sit on the edges of tectonic plates.

Answer:

the heat energy is transformed to any kind of energy depending on what it's meant to be transformed to.

remember it cannot be destroyed so it's definitely transformed to some kinda energy

The moles of NaOH used is 0.0008 moles

The molarity of the acid  is 0.008 M

The molarity of the acid is found as follows:

Moles of NaOH used = concentration of NaOH × volume of NaOH used

the average volume of NaOH used = 8.0 mL

moles of NaOH = 0.1 M × 8.0 mL

moles of NaOH = 0.0008 moles

Molarity of acid:

Assuming the acid is monobasic, the mole ratio of acid to base is 1 : 1

The volume of acid used is 100 mL

The molarity of acid = moles of acid / volume of acid in liters

The molarity of acid = 0.0008 moles / 0.1 L

The molarity of acid  = 0.008 M

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Ionization potential and ionization energy are two terms used to describe the same thing.

The ionization potential of hydrogen atom is 13.6 eV

The ionization potential is the energy that is required to remove an electron from the neutral atom. It is the same as the ionization energy.

From the question, we can see that the ionization energy of the hydrogen atom is 13.6 eV, it also means that the ionization potential of the hydrogen atom is also 13.6 eV.

Therefore, If ionization energy of hydrogen atom is 13.6 eV then its ionization potential will be 13.6 eV

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The considerations which are applicable in a suitable recrystallization solvent are: should have a boiling point that is ~ 30-50 °C, Should be unreactive, Offers minimal solubility and solubility-temperature relationship. Option A, C, D and E will be correct.

This statement is true. Because the solvent should have a boiling point that is around 30-50 °C higher than the melting point of the compound to be recrystallized in order to achieve efficient dissolution and crystal formation.

This statement is false. Because a good recrystallization solvent should dissolve the compound of interest well at high temperatures but not at all or only slightly at lower temperatures. Ideally, the impurities should dissolve well at all temperatures, so that they can be separated from the compound of interest during the filtration step.

This statement is true. Because the solvent should not react with the compound of interest, which would affect the purity of the final product.

This statement is true. Because the solvent should have minimal solubility for the compound to be purified at room temperature and lower temperatures, but should dissolve the compound well at higher temperatures in order to achieve efficient recrystallization.

This statement is true. Because the solubility-temperature relationship for the solvent and the compound should have a low slope in order to achieve efficient recrystallization.

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--The given question is incorrect, the correct question is

"Which of the following considerations are applicable when choosing a suitable recrystallization solvent? (TRUE / FALSE) A) Should have a boiling point that is ~ 30-50 °C above room temperature. B) Does not dissolve impurities at all temperatures or completely dissolves impurities at all temperatures. C) Should be unreactive toward the compound of interest. D) Offers minimal solubility of the compound to be purified at room and lower temperatures. E) Its solubility-temperature relationship to the compound should give a curve with a low slope."--

The molecules of Li₂O that would produce if you used up 6 atoms of Li(s) is 3.

It is an unstable inorganic and radical compound, used in the manufacture of glass and ceramic.

The balanced equation

\(\rm 6 Li(s) + O_2(g) \rightarrow 3 Li_2O(s)\)

If the atoms of lithium moves up to 6 the lithium oxide molecules will be 3, as you can see in the equation.

Thus, the molecules of Li will be 3.

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Answer:

A

Explanation:

I took the test 100%, good luck

Erosion and deposition work together to form sand dunes as waves cause erosion along coastlines and deposit sand away from the shore. So the correct option is A.

Erosion is the removal of the material's surface from the crust of the Earth. It is mainly the debris of soil and rock. The eroded materials are transported by natural agents such as water or wind from the point of their removal.

The term erosion gives an explanation for the wearing down and molding of the landforms on the surface of Earth. This includes the rock weathering from its original position, the transport of this weathered material, and the erosion which is the result of the action of wind or glacial processes, etc.

The more appropriate term for this would be denudation or degradation. This includes processes of mass movement. This is a definition of erosion that is very narrow and excludes the process of the transport of eroded material by natural agencies.

Therefore, the correct option is A.

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The compound that is formed from the combination of NH₄⁺ and SO₃²⁻ is (NH₄)₂SO₃ and the compound that is formed from the combination calcium ion and phosphate ion is Ca₃(PO₄)₂.

Definition of Ionic bond

A bond that is formed by the complete transfer of some electrons from one atom to another is known as an ionic bond. The atom which loses one or more electrons becomes a cation—a positively charged ion. The atom which gains one or more electron becomes an anion—a negatively charged ion.

The term "ionic bonding" is given "when the ionic character is greater than the covalent character".

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