Does an astronaut’s body change in size and shape in space?

Answer:

Magnesium (Mg) is able to bond with one oxygen (O) atom. The formula of the compound is MgO. You can see in the dot structure that the two atoms share four different electrons. When a bond is made with four electrons, it is called a double bond. I think...

If 250 mL of methane (CH4) effuses through a small hole in 48 s, the time required for the same volume of helium to pass through the hole is approximately 96 s.

The effusion rate of a gas is inversely proportional to the square root of its molar mass, according to Graham's law of effusion. In this case, we need to compare the effusion rates of methane and helium.

Since the volume is constant, we can use the ratio of their times of effusion.

Let's assume the molar mass of methane (CH4) is M1 and the molar mass of helium (He) is M2. According to Graham's law, the ratio of the effusion times is given by:

(time for methane) / (time for helium) = √(M2 / M1)

Given that the time for methane is 48 s, we need to find the time for helium. Rearranging the equation, we have:

(time for helium) = (time for methane) / √(M2 / M1)

By substituting the molar masses of methane (16.04 g/mol) and helium (4.00 g/mol), we can calculate:

(time for helium) = 48 s / √(4.00 g/mol / 16.04 g/mol)

(time for helium) = 48 s / √(0.25)

(time for helium) = 48 s / 0.5

(time for helium) = 96 s

Therefore, the time required for the same volume of helium to pass through the hole is approximately 96 seconds.

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There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, ionic bond is polar and covalent  bond is non polar.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

An ionic compound is a metal and nonmetal combined compound. Ionic compound are very hard. They have high melting and boiling point because of strong ion bond.

The compound that is ionic in nature can be dissociated very easily in water. Since ionic compounds are polar in nature, they readily dissolve in water.

Ionic bond is formed by element whose difference in electronegativity is high, these are polar. Whereas, covalent bond is formed by element whose electronegativity difference is zero.

Therefore, ionic bond is polar and covalent  bond is non polar.

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The bond order for a second-period diatomic particle containing five electrons in antibonding molecular orbitals and eight electrons in bonding molecular orbitals is 1.5

Bond order is defined as the number of electrons in bonding molecular orbitals minus the number of electrons in antibonding molecular orbitals divided by two. As a result, we may determine the bond order of this diatomic particle by the formula: Bond order = (number of bonding electrons - number of antibonding electrons) / 2

Bond order = (8 - 5) / 2

Bond order = 1.5.

This diatomic molecule, according to the bond order, is a stable molecule since the bond order is greater than 1, indicating that it is a double bond. The molecule has an overall bond strength that is greater than a single bond, but not as strong as a triple bond. So therefore he bond order for a second-period diatomic particle containing five electrons in antibonding molecular orbitals and eight electrons in bonding molecular orbitals is 1.5

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Fertilization occurs in the fallopian tubes, while implantation occurs in the uterus.

Fertilization: Fertilization is the process by which a sperm cell from a male and an egg cell (ovum) from a female combine to form a zygote, which is the first stage of a new individual. Fertilization typically occurs in the fallopian tubes, also known as the uterine tubes or oviducts. When a woman ovulates, an egg is released from one of her ovaries and travels through the fallopian tube toward the uterus. If intercourse occurs during this time and sperm are present in the reproductive tract, they can swim through the cervix, enter the uterus, and reach the fallopian tubes. Fertilization most commonly occurs in the ampulla, which is the widest part of the fallopian tube. Once inside the fallopian tube, the sperm must navigate through the tubal environment and reach the egg. The sperm cells undergo a process called capacitation, which involves changes that enable them to penetrate the egg's outer layer. Eventually, one sperm cell successfully penetrates the egg, and their genetic material combines, forming a zygote.

Implantation:After fertilization, the zygote begins to divide and develop   a multicellular structure called a blastocyst. The blastocyst then travels through the fallopian tube and reaches the uterus, where it needs to implant for further development. Implantation refers to the process in which the blastocyst attaches itself to the lining of the uterus, known as the endometrium. The endometrium undergoes changes during the menstrual cycle to prepare for potential implantation. If the blastocyst successfully implants into the endometrium, it establishes a connection with the maternal blood vessels, allowing it to receive oxygen and nutrients from the mother's body.

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The resulting pH of the solution would be 14, as the addition of 5.0 mL of 2.0M NaOH to 45.0 mL of water completely dissociates into OH- ions, resulting in a concentration of 2.0M OH- ions.

When 5.0 mL of 2.0 M NaOH is added to 45.0 mL of pure water, the resulting solution will have a diluted concentration of NaOH. To find the new concentration, use the formula:

C1V1 = C2V2

Where C1 and V1 are the initial concentration and volume of NaOH, and C2 and V2 are the final concentration and volume of the solution. In this case:

(2.0 M)(5.0 mL) = C2(50.0 mL)

C2 = 0.2 M NaOH

Since NaOH is a strong base, it dissociates completely in water, resulting in an equal concentration of OH- ions. So, [OH-] = 0.2 M.

Next, use the ion product of water (Kw) to find the concentration of H3O+ ions. Kw = [H3O+][OH-] = 1.0 x 10^(-14) at 25°C.

[H3O+] = Kw / [OH-] = (1.0 x 10^(-14)) / (0.2) = 5.0 x 10^(-14) M

Finally, to find the pH of the solution, use the formula:

pH = -log[H3O+]

pH = -log(5.0 x 10^(-14)) ≈ 13.3

So, the resulting pH of the solution is approximately 13.3.

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In any aqueous solution at 25°C, the ionic-product of water (Kw) is a constant value equal to 1.0 x 10⁻¹⁴ mol²/L².

Due to the auto-ionization or self-ionization of water, water molecules dissociate into hydronium ions (H₃O⁺) and hydroxide ions (OH⁻). At 25°C, the Kw is equal to 1.0 x 10⁻¹⁴ mol²/L².

This constant value of Kw plays a crucial role in understanding the acidity and basicity of aqueous solutions. It helps to establish the relationship between the concentrations of hydronium and hydroxide ions, as their product remains constant at a given temperature. The pH and pOH scales are derived from this relationship, providing a convenient method for measuring the acidity or basicity of a solution.

In summary, the ionic-product of water, Kw, remains constant at 1.0 x 10⁻¹⁴ mol²/L² for any aqueous solution at 25°C. This constant is a result of the auto-ionization of water and helps to understand the relationship between hydronium and hydroxide ions in the context of acidity and basicity.

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The correct answer is C, pOH=14−pH.

In pure water, the concentration of H+ ions is equal to the concentration of OH- ions, which means that the pH and pOH of pure water are equal at 7. At higher temperatures, some of the water molecules ionize into H+ and OH- ions, causing the pH to decrease and the pOH to increase.

Since the measured pH at 50°C is 6.6, we can calculate the pOH using the equation:

pH + pOH = 14

pOH = 14 - pH

Substituting the measured pH of 6.6 into the equation gives:

pOH = 14 - 6.6 = 7.4

Therefore, the correct answer is C, pOH=14−pH.

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Answer:

yes

Explanation:

Answer:

dont know

Explanation:

Answer:

i believe it is a

Explanation:

The reason is :a.They can gain more food for their offspring

Animals tend to protect their territory because they don't want  intruders to invade their territory.

Animals majorly protect their territory in order to protect their foods from been eating by intruders as this will enables their offerings to have enough foods to eat.

They as well guard  their territory in order to prevent intruders from invading the place they have prepare as their mating place.

Inconclusion  The reason why some animals defend  their territory after they have mated

and reproduced is :a.They can gain more food for their offspring

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• given that volume = 230ml ,therefore mass of water = 230g

• ∆T = Tfinal-Tinitial =30.5-22.9 = 7.6°C

• Specific heat capacity of water , C= 4.184J/°C*g

• Therefore , q = mass* C * ∆T

= 230 * 4.184 * 7.6

=7313.6 J /1000

q= 7.314KJ

• given : mass of methanol burned = Mass F-Mass initial

=(2.51-1.65) = 0.86 g

• So ,moles of methanol , n = mass methanol/Mol. mass methanol

= 0.86g/32.04g/mol

=0.027 moles

• Finally , ∆H = q/n

= 7.314KJ / 0.027mol

=270.85KJ/mol

• However, this is an exorthemic reaction, heat is lost through combustion, our molar enthalpy should be negative.

Answer:

bacteria

Explanation:

When we draw a potential energy (PE) curve for the interaction of two atoms, we are essentially plotting the energy of the system as a function of the distance between the two atoms.

In the case of Ne and Xe, the PE curve for both atoms will have a similar shape, but the relative depths of the potential wells and the positions of the minima along the x-axis will differ.
The relative depths of the potential wells represent the stability of the interaction between the two atoms. A deeper potential well indicates a more stable interaction, while a shallower potential well indicates a less stable interaction. The relative depths of the potential wells for Ne and Xe will be different due to the differences in their atomic radii. Xe is a larger atom than Ne, and therefore the attractive forces between the two atoms will be stronger, resulting in a deeper potential well.

The relative positions of the minima along the x-axis represent the equilibrium bond distance between the two atoms, which is the distance at which the potential energy is minimized. The equilibrium bond distance for Xe will be greater than that for Ne due to the larger atomic radius of Xe. This means that Xe atoms will be more likely to form bonds at longer distances than Ne atoms.

In summary, the PE curves for Ne and Xe will have similar shapes but different relative depths of potential wells and positions of minima due to the differences in their atomic radii. Xe will have a deeper potential well and a greater equilibrium bond distance than Ne.

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The following are all predicted to have an identical shape under the vsepr theory, with the exception of: BH 3

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Answer:

Step-by-step explaination:

AC is a straight line, D is a ray on it.

Hence, 135° and <b are a linear pair.

Therefore,

<b + 135° = 180°

<b = 180° - 135°

<b = 45°

And,

AC and BD are intersecting lines.

Hence, <b and <c are vertically opposite angles.

Therefore,

<b = <c

45° = <c

Also,

AC is a straight line.

Hence the angles; <a, <c and 45° add up to 180°.

Therefore,

<a + <c + 45° = 180°

<a + 45° + 45° = 180°

<a + 90° = 180°

<a = 180° - 90°

<a = 90°

CAD and TAG are interesting lines,

Hence, <CAT and <GAD are vertically opposite angles.

<CAT = <GAD

5x = 7x - 20°

5x - 7x = -20°

-2x = -20°

x = -20°/-2

x = 10°

The lysosome is the organelle that is formed when an endosome, containing hydrolytic enzymes necessary for the digestion of the materials, reaches a low pH of approximately 4.5.

Lysosomes are sac-like vesicles with single membranes that enclose hydrolytic enzymes that can break down biomolecules. Lysosomal enzymes work best in acidic environments and thus the pH of the lysosome is around 4.5, which is slightly acidic. The formation of lysosomes begins with the formation of endosomes.

Endosomes form through the process of endocytosis. In endocytosis, the cell membrane invaginates and surrounds a portion of the extracellular fluid, thereby forming a small vesicle, called a primary endosome. Primary endosomes mature into late endosomes by fusing with other primary endosomes or with other vesicles.

Late endosomes then mature into lysosomes by undergoing changes in the structure of their membranes that facilitate the mixing of hydrolytic enzymes with the material to be digested. In summary, lysosomes are organelles that contain hydrolytic enzymes that can break down biomolecules.

They form when endosomes reach a low pH of approximately 4.5. The formation of lysosomes begins with the formation of endosomes that mature into late endosomes and then into lysosomes. The pH of lysosomes is acidic, around 4.5.

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Answer:

This question lacks options. The options are:

A. The two substances underwent a physical change

B. The two substances were melting

C. A new substance was forming

D. A change in the mass of the two substances

The answer is C

Explanation:

Changes in chemistry can either be physical or chemical. A physical change as the name implies does not alter the chemical content of the susbtances involved. However, chemical changes affect the chemical composition of the substances, hence, new substances are produced.

A chemical change is also characterized with a color change, temperature change, gas evolution etc. In this question, Mia mixed two substances in a test tube and noticed that the test tube became warm, gas came out from the test tube. This implies a CHEMICAL CHANGE, LEADING TO THE FORMATION OF NEW SUBSTANCES.

The compound H₃C-CH₂-CH₂-CH₃ is expected to have the largest heat of combustion.

The heat of combustion, ΔHc, of an organic compound is defined as the amount of heat produced when one mole of a substance is burned completely in excess air or oxygen. The heat of combustion of an organic compound is usually expressed in kJ/mol. The combustion of alkanes is an exothermic reaction that produces heat.

The heat of combustion increases as the size of the molecule increases because more bonds must be broken to combust larger molecules, resulting in a greater release of heat. Since the compound H₃C-CH₂-CH₂-CH₃ has a larger molecular mass and more carbon atoms than the other three compounds, it is expected to have the largest heat of combustion compared to the other three compounds CH₃, H₃C-CH₂-CH₃, and CH₃-CH₂-CH₃.

Thus, the compound H₃C-CH₂-CH₂-CH₃ is expected to have the largest heat of combustion.

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The strongest acid in the list is b. HClO3, also known as chloric acid.

To select the strongest acid from the list provided, which includes a. HBrO, b. HClO3, c. HBrO2, d. HClO2, and e. HIO, we can compare their acidic strengths:

To determine acidic strength, we can look at the pka values of each option:

pka value for HBrO = 8.55

pka value for HClO3 = -1.00

pka value for HBrO2 = 4.92

pka value for HClO2 = 7.60

pka value for HIO = 11

Lower the pka value, more is the acidic strength and hence , stronger the acid is. From above written values, we can infer that the lowest pka value is -1.00 and that corresponds to HClO3 i.e, Chloric Acid.

Hence, the strongest acid in the list is b. HClO3, also known as chloric acid.

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Decreasing a reactant’s particle size will increase the reaction rate.

So that when reactant's particle size decreases then rate of reaction increases .

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Answer; 2.531 moles

Explanation:

Answer:

A. PO4^3-

Explanation:

took the quiz on a pex

The conjugate base of HPO₄²⁻ is PO₄³⁻. Therefore, option (A) is correct.

The Bronsted-Lowry concept can be explained as an acid-base reaction where base and acid react with each other and by an exchange of proton acid, forms its conjugate base and the base generates its conjugate acid.

The Bronsted-Lowry theory is an extended version of Arrhenius's theory of acid-base. According to this concept, acid can be defined as a substance that donates a hydrogen ion or a proton and produces its conjugate base and the base can be defined as a substance that accepts a proton and creates its conjugate acid.

Bronsted-Lowry acid in the dissociation form can be represented as:

Acid   ⇄   Conjugate base +   H⁺

The conjugate base of Bronsted-Lowry acid HPO₄²⁻ can be represented as follows:

HPO₄²⁻   ⇄  PO₄³⁻ +   H⁺

Therefore, PO₄³⁻ is the conjugate base of the Bronsted-Lowry acid HPO₄²⁻​.

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Answer:

1. Volume

2. Mass

3. Volume

4. Mass

5. Volume

6. Length

7. Length

8. Mass

9. Mass

10. Length

Answer:

Biogas is a type of biofuel that is naturally produced from the decomposition of organic waste. When organic matter, such as food scraps and animal waste, break down in an anaerobic environment (an environment absent of oxygen) they release a blend of gases, primarily methane and carbon dioxide.

Explanation:

Biomass is renewable organic material that comes from plants and animals. ... Biomass contains stored chemical energy from the sun. Plants produce biomass through photosynthesis. Biomass can be burned directly for heat or converted to renewable liquid and gaseous fuels through various processes.biodigester is like a mechanical stomach. It is fed with organic material, which is broken down (decomposed) by micro-organisms (bacteria) is an oxygen-free (anaerobic) environment to produce a renewable energy called biogas (methane and carbon dioxide) and other material that is mainly used as fertilizer.

Explanation:

Biogas is a type of biofuel that is naturally produced from the decomposition of organic waste.

Biomass is plant or animal material used for energy production, or in various industrial processes as raw substance for a range of products.

A Biodigester simply means a tank which digests organic material biologically. In this sense, the FilterPod is a biodigester. However, many people think of a biodigester as a tank which digests, anaerobically, without air, organic material and produces methane gas for cooking, lighting and heating ect.

Two kinds of carbonyl acceptor structures in addition to benzoate ester are dialkyl carbonate and benzophenone.

Grignard reaction is an organometallic organic chemical reaction in which alkyl, allyl, vinyl or aryl-magnesium halides who are called as Grignard reagent are added to the carbonyl group in aldehyde or ketone. This reaction is important for the formation of carbon-carbon bonds. or basically they are mainly used for the formation of carbonyl compounds.

Triphenylmethanol can be synthesized by Grignard reaction using 3 different starting materials and also the different number of equivalents of Grignard reagent.

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Answer: During succession, new species move into an area and colonize it.

Explanation: Ecological succession refers to the process of change in the composition and structure of an ecosystem over time. It occurs due to the interactions between the biotic (living) and abiotic (non-living) components of an environment. As succession progresses, new species gradually establish and thrive in the area, leading to a change in the species composition. This process can occur over a long period of time, ranging from decades to centuries, depending on various factors such as environmental conditions and the specific type of succession.