Answer: 1.00 L
Explanation: Pressure and Volume are inversely proportionate. The volume increases at a factor of 2, from 1.00 L to 2.00 L. This means the pressure would decrease by a factor of 2, from 4.00 atm to 2.00 atm. Think about it, if you had a box and it doubled in the space, the same amount of gas is still in the container and the pressure would be half as much as these gas particles would have half the amount of collisions against the walls
If matthew wa traveling into pace from earth, which of thee would he be able to reach firt
Alpha Centauri would he be able to reach first.
What is Alpha Centauri ?
At a distance of 4.37 light years, the star system known as Alpha Centauri is thought to be the one that is nearest to our solar system. Alpha Centauri A, Alpha Centauri B, and Alpha Centauri C, often known as Proxima Centauri, are the three stars that make up the stellar system.
The first mention of this star system dates back to 1592, when an explorer named Robert Hues brought it to light through his research. The binary character of the system wasn't understood until 1689. This star system has been the subject of extensive recent research, and studies conducted over the previous ten years have uncovered a number of interesting facts about Alpha Centauri.
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Write the balanced COMPLETE
ionic equation for the reaction
when ammonium carbonate and calcium chloride are mixed in aqueous solution. If no reaction occurs, simply write only NR. Be sure to include the proper phases for all species within the reaction.
Answer:
Explanation:
ammonium carbonate + calcium chloride -----> ammonium chloride + calcium carbonate
(NH4)2CO3 + CaCl2 ----> NH4Cl + CaCO3
The balanced chemical equation for the given reaction is (NH₄)₂CO₃ + CaCl₂ ----> NH₄Cl + CaCO₃.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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What particle can attract electrons?
Answer:
The protons and electrons of an atom are attracted to each other. They both carry an electrical charge. Protons have a positive charge (+) and electrons have a negative charge (-). The positive charge of the protons is equal to the negative charge of the electrons.
Explanation:
Please give the brainliest.
PLEASE HELP!!!!!!
Q.4 Identify the acid in the reaction H₂Se + H₂O --> SeH⁻¹ + H₃O⁺¹ . (1 pt)
1. H₂Se
2. H₂O
3 .SeH⁻¹
4. H₃O⁺¹
Q.5 Identify the base in the reaction H₂Se + H₂O --> SeH⁻¹ + H₃O⁺¹
1. H₂Se
2. H₂O
3. SeH⁻¹
4. H₃O⁺¹
Q.6 Identify the conjugate acid in the reaction H₂Se + H₂O --> SeH⁻¹ + H₃O⁺¹
1. H₂Se
2. H₂O
3. SeH⁻¹
4. H₃O⁺¹
Q.7 Identify the conjugate base in the reaction H₂Se + H₂O --> SeH⁻¹ + H₃O⁺¹
1. H₂Se
2. H₂O
3. SeH⁻¹
4. H₃O⁺¹
The rate constant for weak acid and base for the dissociation is low, they do not easily dissociate in water. Therefore, option 1 is the correct option.
What are acid and base?Acid is a solution which releases H⁺ hydrogen ion when dissolved in water. Base releases hydroxide ion OH⁻ ion when dissolved in water.
pH is a measurement of amount of hydronium ion H₃O⁺ in a given sample. Strength of acidic nature is directly proportional to the concentration of hydronium ion.
On subtracting pH from 14, we get pOH which measures the concentration of hydroxide ion in a given solution. Temperature affect the pH. At room temperature pH scale is between 0 to 14. 7 is the pH of neutral solution. A solution of the ionic salt NaF is basic in nature. The acid in the give equation is H₂Se as it is giving hydronium ion.
Therefore, option 1 is the correct option.
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According to the kinetic-molecular theory, what must always increase when the temperature increases?
Select one:
a. the pressure of the gas
b. the volume of the gas
c. the number of moles of gas
d. the average kinetic energy of the gas particles
e. all of the above
the answer is d
i looked this up i was confused myself but its d or e
what element in the 4d subshell ends with 5 electrons
Answer:
Element Arsenic
Explanation:
w1 q08. what is the molarity of 125 g cobalt chloride dissolved in a final volume of 300 ml? the fw is 237.9 g/mol. give your answer to 2 places after the decimal.
Molarity of 125g cobalt chloride dissolved in a final volume of 300ml is 1.75M.
What is molarity?
Molarity is a unit of concentration for a solution, which is the number of moles of a solute per liter of solution. It is denoted by the symbol “M” and is an important concept in chemistry. Molarity is used to quantify the amount of a solute that is present in a solution and can be used to calculate the volume of a solution required to make a solution with a certain molar concentration. Molarity is a key parameter in determining the properties of a solution and is used to solve for the mass or volume of a solute needed to make a solution.
M= no. of moles of solute /volume of solution (in L)
Volume of solution = 300/1000 =0.3 L
Moles of cobalt chloride = 125/237.9 moles
M= 125/ (237.9×0.3) = 1.75 mol L⁻¹ = 1.75M
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in most crystalline metals, plastic deformations caused by loads greater than the yield stress are the result of
In most crystalline metals, plastic deformations caused by loads greater than the yield stress are the result of dislocation motion.
The dislocation motion plays the important role in the plastic deformation. The plastic deformation occurs when a material will be stress. The resulting plastic deformation is the permanent change. this permanent change is cannot be recovered by the removing the the stress that caused the deformation. the plastic deformation caused by the dislocation motion. dislocation motion, atoms in metals to side readily.
Thus, the plastic deformations is caused by the dislocation motion. this plastic deformation is the permanent change and not be removed by the simply removing the stress.
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Baking soda (NaHCO3) decomposes when it is heated according to the equation below. How many kilojoules of heat are required to decompose 1.96 mol NaHCO3( s)?
2NaHCO3( s) + 129 kJ → Na2CO3( s) + H2O( g) + CO2( g)
2.53 × 10 2kJ
126 kJ
129 kJ
258 kJ
Answer:a
Explanation:
look it up
what is the lewis structure for carbon tetraiodide, which contains one carbon and four iodine atoms?
Carbon is covalently bound to four iodine atoms in [tex]CI_{4}[/tex], also known as carbon tetraiodide, which is [tex]sp^{3}[/tex] hybridized.
Its form is tetrahedral, and its bond angles are 109.5°. It is vivid red in color and easily breaks down into tetraiodoethylene [tex]C_{2}I_{4}[/tex].
Of the nonmetals we mix with halogens, carbon has perhaps proven to be the most challenging. The electronegativity of carbon is 2.5, which puts it on par with iodine and just somewhat behind fluorine, chlorine, or bromine. Thus, carbon may share some of its electrons in a covalent connection with halogens.
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an electronic interaction that stabilizes alkenes and carbocations and results from overlap of a vacant p orbital on one atom with the neighboring c-h sigma bond is known as
an electronic interaction that stabilizes alkenes and carbocations and results from overlap of a vacant p orbital on one atom with the neighboring c-h sigma bond is known as Hyperconjugation.
The delocalization of the sigma electrons in the C-H bond of an alkyl group coupled to an atom in an unsaturated system or to an atom with an unshared p orbital is known as hyperconjugation, which is a general stabilizing interaction. When a suitable attacking reagent is present in an organic molecule, electron displacement happens.
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Which statement describes the process of subduction?
Convection currents cause two plates to move away from each other.
A plate slides beneath another plate due to convection currents and gravity.
Materials are heated and transferred within Earth’s interior by density.
Heat cycles in the mantle cause plates to constantly move.
A plate slides beneath another plate due to convection currents and gravity. Hence option 2 is correct.
What is subduction?Subduction is defined as a process through which, at convergent borders, the oceanic lithosphere is recycled into the Earth's mantle. Subduction happens when one plate is driven beneath the other and back into the Earth's interior when two plates collide at a convergent boundary.
An object is drawn into the mantle by convection currents. Due to gravitational attraction, one plate slides under another. When an oceanic plate collides with a continental plate and slides beneath it, subduction occurs. When two oceanic plates or a plate bearing continents contact, one plate will bend and slide under the other.
Thus, a plate slides beneath another plate due to convection currents and gravity. Hence option 2 is correct.
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Answer: b. A plate slides beneath another plate due to convection currents and gravity.
Explanation:
Does a cold pack absorb or release energy
Determine the [H] , pH, and pOH of a olution with an [OH−] of 2. 1×10−7 M at 25 °C. [H]=
Therefore, all you have to do is subtract 14 from the negative base-10 logarithm of the concentration of H+.
What is the equation for calculating pH and pOH?Simply deduct the pH from 14 to obtain the pOH. Take the negative log of the hydroxide ion concentration to determine the pOH. Simply subtract pOH from 14 to determine the pH.
What connection exists between the H+ concentration and the OH- concentration?The acidity of the solution increases with the amount of [H+] ions present. The more [OH-] ions there are in the solution, the more basic it is. Water has a unique characteristic that, depending on what is dissolved, causes it to behave as either an acid or a base.
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clearly explain what the results of the ferric chloride tests indicate. were these results expected? what did the test on the aspirin you synthesized prove?
Aspirin is an effective pain reliever (i.e. analgesic), fever reducer (i.e. antipyretic) and anti-inflammatory agent and is one of the most widely used non-prescription drugs. It is synthesized by the esterification of salicylic acid with acetic anhydride in presence of little amount of an acid as a catalyst.
After completion of synthesis, to identify the presence of unreacted salicylic acid (starting material or reactant) in the crude aspirin product, the ferric chloride test is used.FeCl3(aq) solution is used to check and test the purity of the crude aspirin.
When FeCl3 solution (2 drops of FeCl3 neutral solution in 1 mL of ethanol) is added to the solution of product formed, the salicylic acid gives purple color, while the crude aspirin product and the final purified aspirin, both gives yellow color.
This is because Fe³ ion reacts with phenols (i.e. salicylic acid) to form a purple complex. Salicylic acid contains a phenol group, whereas, acetylsalicylic acid (Aspirin) does not. Thus, after the addition of FeCl3 to the crude aspirin solution, if a purple color is observed, it means that there is still some salicylic acid present unreacted and the obtained product is impure.
If only, the yellow color is observed upon addition of ferric chloride, that means there is no unreacted starting material present in the product. A minor amount may be present in the crude aspirin product, which is not in enough concentration to form a complex with the ferric chloride to generate the purple color.
After that, when the purple color does not observe, then the product only contain crude aspirin, which can be purified by recrystallization.
For this, the crude aspirin is dissolved in a small amount of warm ethanol with a known quantity of water is added and the resultant solution is allowed to cooled slowly and then chilled.
The acetylsalicylic acid will recrystallize and the solid impurities (like unreacted salicylic acid) will remain dissolved in the solution.
The crystallised solid aspirin is collected through filtration and again tested for FeCl3 purity test, which should give yellow color with iron and it should be purer than the original aspirin.
The ferric chloride purification test of aspirin crude product suggest or prove that if an unreacted starting material is there or not. If purple color is found then starting material should be removed by suitable other purification methods like crystallisation.
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Calculate the change of enthalpy for the reaction 2Al (s) + 3Cl2 (g) --> 2AlCl3 (s) from the following reactions
Reaction 1: 2Al (s) + 6HCl (aq) --> 2AlCl3 (aq) + 3H2 (g) Change in enthalpy: -1049 kJ
Reaction 2: HCl (g) --> HCl (aq) Change in enthalpy: -74.8 kJ/mol
Reaction 3: H2 (g) + Cl2 (g) --> 2HCl (g) Change in enthalpy: -1845. kJ/mol
Reaction 4: AlCl3 (s) --> AlCl3 (aq) Change in enthalpy: -323. kJ/mol
Include the following:
The numerical answer with correct units.
State which reactions, if any, you had to "Flip".
State which reactions you had to multiply, if any, to get the correct amount of the compound. Also, include how much you multiplied the reaction by.
The change of enthalpy for the given reaction is equal to -6387 KJ.
What is the enthalpy change?Enthalpy can be defined as the sum of internal energy and the product of volume and Pressure, expressed as shown below:
H = U + PV
The change in enthalpy between the beginning and final states can be expressed as:
ΔH = ΔU + ΔPV
Given reactions with enthalpy change are shown below:
2Al (s) + 6HCl (aq) → 2AlCl₃ (aq) + 3H₂ (g) }×1 ΔH₁ = -1049 kJ
HCl (g) → HCl (aq) } ×6 ΔH₂ = -74.8 kJ/mol
H₂ (g) + Cl₂ (g) → 2HCl (g) }× 3 ΔH₃ = -1845. kJ/mol
AlCl₃ (aq) → AlCl₃ (s) }× 2 ΔH₄ = +323. kJ/mol
[tex]\triangle H^o_f =1\times \triangle H_1 +6\times \triangle H_2+3\times \triangle H_3+2\times \triangle H_4[/tex]
[tex]\triangle H^o_f =1\times (-1049) +6\times (-74.8)+3\times (-1845)+2\times (+323)[/tex]
[tex]\triangle H^o_f =-6387 KJ[/tex]
Therefore, the change of enthalpy for the reaction of the formation of aluminum chloride is -6387 KJ.
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what mechanistic intermediate is used to explain the preference for addition of the br atom , of hbr, to the internal carbon of a terminal alkyne
The mechanistic intermediate that is used to explain the preference for addition of the Br atom , of Hbr, to the internal carbon of a terminal alkyne is free-radical conditions.
The addition of HBr to an alkyne under free-radical conditions is governed by the addition of a Br atom to the alkyne which helps in giving the most stable alkyl radical possible. The addition of HBr in the absence of radicals is governed by the addition of a proton to the double bond which helps in giving the most stable carbocation possible.
A molecule wherein a carbon atom has a fine fee and three bonds is known as a carbocation. We can basically say that they are carbon cations. Later, it forms into carbonium ion. Any even-electron cation that possesses a big effective charge at the carbon atom is known as an carbocation.
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A boxer punches a punching bag with a force of 1300 Newtons. How much force does the punching bag exert on the boxer when his fist collides with the bag?
Answer:
The punching bag exerts a force of 1300 Newtons on the boxer.
Explanation:
The punching bag exerts 1300 Newtons on the boxer because Newton's third law says that "every action has an equal and opposite reaction" which means that for example, as the boxer punches the punching bag, the boxer exerts a force of 1300 Newtons to the right. The punching bag at the same time exerts a force of 1300 Newtons to the left against the boxer. So "every action" would be the boxer pushing on (punching) the bag and the bag moving (for example) to the right, away from the boxer, "equal and opposite reaction" would be the punching bag pushing against the boxer (during contact) and moving to the left, which is cause for the back and forth movement of the bag after contact with the boxer.
(Sorry for the long-winded explanation, hope this helps!)
Arrange The Following Gases In Order Of Increasing Average Molecular Speed At 25°C. CI 2,0 2. F 2. N2 Cl2 < F2 <02 < N2 Cl2 < 02
N2 < F2 < Cl2 < 02 By Terms Of Increasing Average Molecular Speed At 25°C, according to the stated formula.
A molecular example is what?Molecules were inorganic entities that are composed of different molecules. Examples include typical substances like water (H2O) and carbon dioxide (CO2).
What do you mean by molecular?Two or even more atoms make up molecules. They may have the same atoms (for example, an oxygen molecule contains two oxygen atoms) or different atoms if they have more than one (a water molecule has two hydrogen atoms and one oxygen atom). Biological molecules like DNA and proteins can include thousands of atoms.
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Which question about plants can be answered scientifically by classifying?
OA. Which kind of flower smells the best?
OB. What does a plant need in order to survive?
OC. What kinds of animals like to eat dandelion plants?,
OD. Is an oak tree a plant?
The question about plants can be answered scientifically by classifying is What kinds of animals like to eat dandelion plants? Therefore, option C is correct.
What kinds of animals like to eat dandelion plants?Many songbirds consume dandelion seeds, including chipping, field, house, song, and white-throated sparrows, American goldfinches, and indigo buntings. Bobwhite quail, wild turkeys, ruffed grouse, rabbits, white-tailed deer, and eastern chipmunks all consume dandelions.
They are one of the first food sources for bees, butterflies, moths, flies, beetles, and other insects because they bloom early in the spring. Dandelion seeds are eaten by finches and sparrows.
Thus, option C is correct.
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What is the nonmetallic ion in Lithium Oxide?
Answer:The ionic formula for Lithium Oxide is
L
i
2
O
.
Lithium is an Alkali Metal in the first column of the periodic table. This means that lithium has 1 valence electron it readily gives away in order to seek the stability of the octet. This makes lithium a
L
i
+
1
cation.?
Explanation:
Answer: O 2 2−
Explanation: I just ripped this
how much energy is given off when 1.00 g fe is reacted with excess oxygen according to the folllowing reaction
7.35 KJ energy is gives off when 1.00 g Fe is reacted with excess oxygen according to the reaction.
The reaction between Fe and O is as below :
4 Fe(s) + 3 O₂(g) → 2 Fe₂O₃(g)
here , Δ H = - 1652 KJ
The enthalpy change is -1658 KJ. It means the reaction gives off 1652 heat or energy.
Heat released when 1.00g of is reacted with excessive oxygen:
Moles of Iron (Fe) = [tex]\frac{1g}{56g/mol}[/tex] = 0.0178 mol
According to reaction, When 4 moles of an Iron (Fe) reacts with 3 moles of Oxygen (O) it gives 1652 Kilo Joules of Energy.
Then 0.0178 Moles of Iron (Fe) will give :
∴ [tex]\frac{1652 KJ}{4}[/tex] × 0.0178 = 7.35 KJ
So, 1.00 g of Fe reacts with an excess of oxygen to release 7.35 KJ of energy.
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what is the identity of a 100.0 g sample of metal that, upon absorbing 4680 j of heat, increases in temperature by 52.0 °c?
Aluminum is a metal whose temperature rises by 52.0 °C in a 100 g sample after absorbing 4680 J of heat.
What is specific heat capacity?
The amount of heat per unit mass needed to raise the temperature by one degree Celsius is known as the heat capacity or specific heat. The ability to distinguish between two polymeric composites using specific heat is useful in calculating processing temperatures and the quantity of heat required for processing.
We have a mass (m) of 100 g of an unidentified metal whose temperature (T) rises by 52.0°C after absorbing 4680 J of heat (Q). The amount of heat needed to raise the temperature of the unit mass by the unit of temperature is known as the specific heat capacity (c) of the metal.
The metal with the highest specific heat capacity is aluminum (0.900 J/g°C).
Aluminum is a metal whose temperature rises by 52.0 °C in a 100 g sample after absorbing 4680 J of heat.
Hence, Aluminum is the metal
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Baed on relevant data/information that you provide on a country of your choice, what do you think the pace of technological change would in near future? explain your anwer uing a relavant theoretical framework and data
These technology would changes in near future
Artificial Intelligence
Gene Technology
Human-Computer Interfaces
What is Artificial Intelligence Technology?
The definition of artificial intelligence is the theory and development of computer programs that are able to do tasks and solve problems that usually require human intelligence
You've probably read or heard of the ubiquitous buzzword known as artificial intelligence, or AI. When you think about AI, articles about technology, the digital age, and robotics might come to mind. But what exactly is it, and how is it put to use?
Programming technology to solve problems is a technological advancement known as artificial intelligence
In-depth explanations of artificial intelligence's definition, applications, and future prospects are provided in this manual.
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How much energy does a wave with a frequency of 3.78 x 1010 Hz have?
The energy of the wave of frequency 3.78×10¹⁰ Hz is 2.5×10⁻²³ J.
What is energy?Energy is the ability or the capacity to perform work.
To calculate the energy of the wave, we use the formula below.
Formula:
E = hf......... Equation 1Where:
E = Energy of the waveh = Planck's constantf = Frequency of the waveFrom the question,
Given:
f = 3.78×10¹⁰ Hzh = 6.63×10⁻³⁴ J/HzSubstitute these values into equation 1
E = 3.78×10¹⁰×6.63×10⁻³⁴ E = 2.5×10⁻²³ JHence, the energy of the wave is 2.5×10⁻²³ J.
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In a single displacement reaction between al2s3 and li, what products will form and why?.
The products formed during the single displacement reaction between Al₂S₃ and Li are Li₂S₃ and Al.
What are deplacement reactions?
When a more reactive element pushes a less reactive element out of a compound that also contains the less reactive element, a displacement reaction takes place. The less reactive element has undergone a displacement reaction and is now pure and unmixed.
In the reaction of Al₂S₃ and Li the following is observed:
Li+ Al₂S₃ = Li₂S₃ +Al
Lithium displaces aluminium here.
Hence the products formed during the single displacement reaction between Al₂S₃ and Li are Li₂S₃ and Al.
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suppose you are performing an experiment during which the ph must be maintained at 3.70. what would be an appropriate buffer to use?
The acetate buffer pH. 3.7 should be used.
What is buffer and how to prepare?
A buffer is a solution that helps to maintain a stable pH level when acids or bases are added to it. It is composed of a weak acid and its conjugate base, or a weak base and its conjugate acid. Buffers are commonly used in chemical reactions, to maintain the pH of a solution at a certain level. To prepare a buffer, one must choose the desired pH and then select the appropriate weak acid or base and its conjugate partner. The weak acid and its conjugate base, or the weak base and its conjugate acid, must then be mixed in the correct proportions to create the desired buffer. The amount of acid or base added to the buffer solution can then be monitored to ensure the pH remains constant.
Dissolve 10g of anhydrous sodium acetate in 300ml of water, adjust the ph. to 3.7 with glacial acetic acid and dilute with water to 1000ml.
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how long would it take a hiker to travel a total distance of 25.0 km at an average speed of 5.2km/h
The time taken for the hiker to travel a total distance of 25.0 km at an average speed of 5.2 km/h is 4.8 hours
How do I determine the time?We know that speed is defined as the distance travelled per time as shown below:
Speed = Distance / time
With the above formula, we can determine the time taken for the hiker to travel a total distance of 25.0 km at an average speed of 5.2 km/h. Details below:
Distance = 25.0 KmSpeed = 5.2 Km/hTime taken =?Speed = Distance / time
5.6 = 25 / time
Cross multiply
5.6 × time = 25
Divide both sides by 5.2
Time = 25 / 5.2
Time = 4.8 hours
This, the time taken is 4.8 hours
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Match the pictures -
element
mixture
compound
?
Answer:
Explanation:
1. It is an element since it has only one type of atom
2. It is a compound because 2 types of atoms are chemically bound
3. It is a mixture because it has 2 types of atoms which aren't bound
Answer:
First picture: Element
Second picture: Compound
Third picture: Mixture
Explanation:
First picture:
It represents an element as all the atoms are the same.
Second picture:
The other type of atoms are shown as chemically bonded to the green atoms — in the diagram the green atoms and pink atoms are touching.
Third picture:
It is representing a mixture as the other atoms are not chemically bonded together with the green atoms — the green and orange atoms are seperate and are just mixed
the astronaut's suit maintains carbon dioxide levels close to 0%. what is the survivable level of co2 for humans that will have minor symptoms?
The survival level of C02 for humans in space is 0.01 to 0.02% and within the level will have minor symptoms.
More than just a set of clothes for astronauts, spacesuits serve many other purposes. But different suits have different functions, just like a set of clothes. Two different types of spacesuits, each designed to protect astronauts from the hazards of their mission, are typically used during space exploration. One type is worn inside a spacecraft throughout the launch and ascent into space, as well as again during the return trip's re-entry into Earth's atmosphere and during landing. The alternative type is the one that is discussed here and is made especially for spacewalks. Often referred to as an EVA suit, a spacewalk is what NASA refers to as an Extra-Vehicular Activity, or EVA.An astronaut is shielded from the risks of being outside a vehicle while in space or on the Moon by a fully functional spacesuit, which is actually a miniature spaceship shaped like a human body. Astronauts performing spacewalks must contend with radiation, dust, debris, and extremely high temperatures. As low as minus 250 degrees Fahrenheit and as hot as 250 degrees in direct sunlight are possible during spacewalks. The suits supply astronauts with water to drink and oxygen to breathe while maintaining the proper pressure for the body.To study about Earth's atmosphere -
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