Body fluid is the liquid portion of our cells and tissues. In adults, what is the percentage of our body weight that is water?.

Answer: D. Slow down the chain reaction by absorbing free neutrons

Explanation: just got it right on the quiz A P E X

Answer:

D

Explanation:

The concentration of aluminum ions in the solution is 0.15 M.

To determine the concentration of aluminum ions in the solution, you need to know the formula for aluminum nitrate and the number of moles of aluminum nitrate that were added to the water. The formula for aluminum nitrate is Al(NO3)3. This means that for every molecule of aluminum nitrate, there is one molecule of aluminum ions (Al3+).

If the concentration of nitrate in the solution is 0.15 M, that means that 0.15 moles of aluminum nitrate were added to every liter of water. Since there is one mole of aluminum ions for every mole of aluminum nitrate, the concentration of aluminum ions in the solution is also 0.15 M.

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The correct answer would be option C i.e. Na, Cd, and Pb only which react with 1M H₂SO₄ to produce hydrogen gas.

Explanation is as follows:
To answer this question, we need to consider the reduction potentials of the given metals and compare them with the reduction potential of hydrogen (E° = 0). Metals with a lower (more negative) reduction potential than hydrogen will react with 1M H₂SO₄ to produce hydrogen gas.

Here are the reduction potentials of the given metals:

1. Na+: E° = -2.714
2. Cd2+: E° = -0.403
3. Pb2+: E° = -0.126
4. Cu2+: E° = +0.337

Comparing these values to the reduction potential of hydrogen, we find that:

1. Na+ has a more negative reduction potential than hydrogen, so it will react with  1M H₂SO₄ to produce hydrogen gas.
2. Cd2+ also has a more negative reduction potential than hydrogen, so it will react with  1M H₂SO₄ to produce hydrogen gas.
3. Pb2+ has a more negative reduction potential than hydrogen, so it will react with  1M H₂SO₄ to produce hydrogen gas.
4. Cu2+ has a less negative (positive) reduction potential than hydrogen, so it will not react with  1M H₂SO₄ to produce hydrogen gas.

Thus, the correct answer is C. Na, Cd, and Pb only.

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Answer:

Explanation: This reaction is called a synthesis reaction. This is because a synthesis reaction is when two or more reactants combine/react together to form a single product. The two reactants carbon (C) and oxygen (O2) reacted together to form one single product: carbon dioxide (CO2)

Answer:

c i think

Explanation:

Answer:

55

Explanation:

If the balloon is closed, then yes, both volume and pressure will increase when the gas inside is heated.

What is pressure?

Pressure is the force applied perpendicular to the surface of an object per unit area over which that force is distributed.

Various units are used to express pressure. Some of these are units of force divided by units of area. For example, the SI unit of pressure, Pascal (Pa), is 1 Newton per square meter (N/m2). Similarly, pounds force per square inch (psi, symbol lbf/in2) is the traditional unit of pressure in imperial and US systems. Pressure can also be expressed as standard atmospheric pressure. Atmospheric pressure (atm) is equal to this pressure and torr is defined as 1/760 of this. Manometric units such as centimeters of water, millimeters of mercury, and inches of mercury are used to express pressure as the height of a particular liquid column within a manometer.

If the balloon is closed, then yes, both volume and pressure will increase when the gas inside is heated.

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This peptide is positively charged at physiological pH. In conclusion, SDEKAINVKWQLA and SDEKAINVKWQHA are neutral at physiological pH, SEERAINVAWQHA is negatively charged, and SDEK is positively charged.A peptide is a short chain of amino acids that are joined together with peptide bonds.

The nature of a peptide's charge depends on the overall charges of the amino acids in the sequence. At physiological pH, amino acids will either be positively charged, negatively charged, or neutral, depending on their side chains. Let's examine the peptides provided to determine their charges at physiological pH:SDEKAINVKWQLA: This peptide contains a mix of amino acids with positively charged, negatively charged, and neutral side chains. However, the positively charged amino acid (lysine) and the negatively charged amino acid (aspartic acid) are present in equal amounts.

Therefore, this peptide is considered neutral at physiological pH.SDEKAINVKWQHA: This peptide is similar to the first one but has one less amino acid (alanine instead of leucine at the end). It contains the same number of positively charged and negatively charged amino acids, and so it is also neutral at physiological pH.SEERAINVAWQHA: This peptide contains three negatively charged amino acids (aspartic acid and glutamic acid) and only one positively charged amino acid (lysine). Therefore, the peptide overall is negatively charged at physiological pH.SDEK: This peptide contains both positively charged (lysine) and negatively charged (aspartic acid) amino acids. However, there are more positively charged amino acids in the peptide than negatively charged ones.

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4Na + O₂ → 2Na₂O is balanced equation.

Hence, Option (B) is correct answer.

The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.

Now check all the options one by one:

Option (A): 2H₂ + O₂ → 4H₂O

Reactant Side               Product Side

H = 4                               H = 8

O = 2                               O = 4

Here number of atoms of H on the reactant side is 4 and number of atom on product side is 8. H atoms are not balanced in this equation. Hence the given equation is not balanced.

Option (B): 4Na + O₂ → 2Na₂O

Reactant Side               Product Side

Na = 4                            Na = 4

O = 2                              O = 2

Here all the atom on reactant side and product side are equal. Hence the given equation is balanced.

Option (C):  Fe₂O₃ + H₂ → 2Fe + 3H₂O

Reactant Side               Product Side

Fe = 2                              Fe = 2

O = 3                                O = 3

H = 2                                H = 6

Here number of atoms of H on the reactant side is 2 and number of atom on product side is 6. H atoms are not balanced in this equation. Hence the given equation is not balanced.

Option (D): CH₄ + O₂ → CO₂ + H₂O

Reactant Side               Product Side

C = 1                                C = 1

H = 4                               H = 2

O = 2                               O = 3

Here H atoms on the reactant and product side is not equal and O atoms are also not equal on the reactant side and product side. Hence, the given equation is not balanced.

Thus from the above conclusion we can say that The balanced equation from the given options is 4Na + O₂ → 2Na₂O

Hence, Option (B) is correct answer.

Disclaimer: The question was given incomplete on the portal. Here is the complete question.

Question: Which of the following equations is balanced?

(A) 2H₂ + O₂ → 4H₂O

(B) 4Na + O₂ → 2Na₂O

(C) Fe₂O₃ + H₂ → 2Fe + 3H₂O

(D) CH₄ + O₂ → CO₂ + H₂O

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Answer:

Atoms are the smallest particle that make up living both living and non living things, they are made up of subatomic particles; protons, neutrons and electrons. Of these the electrons protons and neutrons are in the nucleus and the protons electrons orbit around the nucleus. Of the subatomic particles, the electrons have the largest smallest mass and are negatively charged, the neutrons (negative charge) (no charge) and protons (positively charged) both have a relative mass of 1. Atoms contain an equal number of protons and neutrons electrons, so carry no overall charge. An element is a substance made up of only two one type of atom. Elements can be found in the Periodic table of elements, they usually have two numbers next to the chemical symbol, the larger number is generally the atomic mass number, which represents the number of neutrons and the number of protons. The smaller number is the relative atomic mass atomic number which represents the number of electrons or neutrons protons. In order to calculate the number of neutrons, you minus the atomic number from the relative atomic mass.

The standard reduction potential for the half-reaction Zn²⁺(aq) + ⁻2e → Zn(s) is -0.76 V; option A

The standard reduction potential of a chemical species is the a measure of the potential of a given chemical species to be reduced rather than being oxidized.

This measurement is done under standard conditions of concentration, pressure and temperature.

The standard reduction potential for the half-reaction Zn²⁺(aq) + ⁻2e → Zn(s) is -0.76 V.

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Answer:

.............hope it helps.......

Answer:

Ga2O3 + 6Li ------> 3Li2O + 2Ga

Answer:

1 Ga2O3 + 6Li——-> 3 Li2O + 2 Ga

Explanation:

Answer:

PbBr₄

C₂O₆

Al₂S₃

Explanation:

Lead (IV) bromide

This is an ionic compound.  Ionic compounds do not tell you how many of each atom you have in the name.  You have to figure out how much there is based on the charges of the atoms.

The (IV) means that lead has a charge of +4.  The charge is put in parentheses since lead is a transition metal, and the charge of a transition metal can vary.  Bromine, on the other hand, is always assumed to have a charge of -1.  When making a molecular formula, you need to have enough of each atom so that the charges cancel out.

Dicarbon hexoxide

This is a covalent compound.  Covalent compounds will tell you how much of each atom you have in the name.  

Dicarbon means two carbons.  Hexoxide means six oxygens.

Aluminum sulfide

Aluminum sulfide is an ionic compound.

Aluminum has a charge of +3.  Sulfur has a charge of -2.

The number of kilojoules of heat that are absorbed when 0.46 g of chloroethane (C,HCI) is vaporized at its normal boiling point is 0.18 kJ (approx).

Given data,

Amount of chloroethane (C,HCI) vaporized, n = 0.46 g

= 0.46 / 64.52 mol

= 0.0071 mol

Heat of vaporization of chloroethane, ΔH vap = 24.7 kJ/mol

Normal boiling point is the temperature at which the vapor pressure of the liquid equals the atmospheric pressure.

Pressure = 1 atm= 101.325 kPa

Therefore, the energy required to vaporize the given amount of chloroethane can be calculated as follows;

ΔH = ΔH_vap*n

= 24.7 kJ/mol × 0.0071 mol

= 0.18 kJ

Hence, the correct option is 0.18 kJ.

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The cat will be 367.72 centifingers tall.

1 finger = 3.1 inches

Recall that: centi =  \(10^-^2\)

Thus, 1 centifinger = \(10^-^2\) finger

The cat is 11.4 inches tall.

If 1 finger = 3.1 inches

Then, how many fingers will make 11.4 inches?

= 11.4 x 1/3.1 = 3.6772 fingers

3.6772 fingers = 3.6772 x  \(10^2\) centifinger

                          = 367.72 centifingers

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Answer:

they ate lelo pudina hahahha

B) Glycerol is not found in nucleic acids. Glycerol is a three-carbon alcohol that is a component of triglycerides, which are the main constituents of fats and oils.

Nucleic acids, such as DNA and RNA, are composed of nucleotide subunits. Nucleotides consist of three components: a phosphate group, a five-carbon sugar molecule (deoxyribose in DNA or ribose in RNA), and a nitrogenous base. In DNA, the nitrogenous bases include adenine (A), guanine (G), cytosine (C), and thymine (T). In RNA, thymine is replaced by uracil (U). Glycerol, on the other hand, is a three-carbon alcohol and is not a component of nucleotides or nucleic acids. It is primarily involved in the structure of lipids, serving as a backbone for triglycerides and phospholipids.

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Answer: acetone

Explanation: Acetone has the weakest intermolecular forces, so it evaporated most quickly. Water had the strongest intermolecular forces and evaporated most slowly.

The new volume of the hot air balloon is 801.9L.

As the temperature of the hot air balloon on the table is increased, the its volume also increases.

Charle's law states that the volume of an ideal gas is directly proportional to the absolute temperature provided pressure is kept at constant.

It is expressed as;

V₁/T₁ = V₂/T₂

Given the data in the question;

To calculate the new volume we subtsitute our given values into the expression above.

V₁T₂ = V₂T₁

V₂ = V₁T₂ / T₁

V₂ = ( 748L × 321.45K ) / 299.85K

V₂ = 240444.6LK / 299.85K

V₂ = 801.9L

The new volume of the hot air balloon is 801.9L.

As the temperature of the hot air balloon on the table is increased, the its volume also increases.

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Answer:

it gets cold or warm

Explanation:

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Measuring tool would you use to measure the area of a football field is used a tender wheel

If you need to measure much longer lengths for example the length of a football pitch then you could use a trundle wheel then you use it by pushing the wheel along the ground and it clicks every time it measures one meter and to measure the football field area then

Area = length×breadth

Area = 90m×45m

Area = 4.05m²

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In the alkaline earth group, atoms with the smallest radii is  beryllium atoms.

The alkaline earth group is the second group (Group 2) of the periodic table, and it includes the elements beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra). These elements share similar chemical properties, including having two valence electrons in their outermost energy level.

When moving from left to right across a period of the periodic table, the atomic radius generally decreases. This trend can be attributed to the increasing effective nuclear charge or the positive charge felt by the outermost electrons due to the attraction of the protons in the nucleus.

However, within the alkaline earth group, beryllium (Be) stands out as having the smallest atomic radius. Beryllium has the smallest atomic size among the elements in this group.

Beryllium has an electronic configuration of 1s² 2s², meaning it has two electrons in the 2s orbital. Since beryllium has a higher nuclear charge (atomic number 4) than hydrogen (atomic number 1), the electrons in the 2s orbital experience a stronger attraction to the nucleus. This stronger attraction leads to a contraction in the atomic radius of beryllium compared to the other elements in the alkaline earth group.

Therefore, the alkaline earth group, beryllium has the smallest atomic radius.

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The Passengers the Balogna could carry if it were filled with hydrogen, and also if it were filled with helium are

\(\begin{tabular}{|l|l|} Passengers with $\quad \mathrm{H}_2:$ & 1007 \\ Passengers with $\mathrm{He}:$ & 928 \\\end{tabular}\)

(h) length of cylinder =100M

(r) radius of cylinder =15M

the volume of a cylinder: \($\pi r^2 \mathrm{~h}=\frac{22}{7} \times(15 \mathrm{~m})^2 \times 100 \mathrm{~m}$$=70714.3 \mathrm{~m}^3$\)

mass of air displaced

\(\begin{aligned}& =1.23 \mathrm{~kg} / \mathrm{m}^3 \times 70714.3 \mathrm{~m}^3 \\& =86978.57 \mathrm{Kg}\end{aligned}\)

when gas is H_2:

Let us assume a number of passengers =x

then, \($x \times 80 \mathrm{Kg}+70714.3 \mathrm{~m}^3 \times 0.090 \frac{\mathrm{kg}}{\mathrm{m}^3}=86978.57 \mathrm{~kg}$\)

x=1007.68 or 1007 people

when gas is{He}_e

then \($\quad x \times 80 \mathrm{~kg}+70714.3 \mathrm{~m}^3 \times 0.18 \frac{\mathrm{kg}}{\mathrm{m}^3}=86978.57 \mathrm{~kg}$\)

x=928.125 or 928 people

ANSWER:

\(\begin{tabular}{|l|l|} Passengers with $\quad \mathrm{H}_2:$ & 1007 \\ Passengers with $\mathrm{He}:$ & 928 \\\end{tabular}\)

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Answer:

Natural Shelters Do not overlook natural formations that provide shelter. Examples are caves, rocky crevices, clumps of bushes, small depressions, large rocks on leeward sides of hills, large trees with low-hanging limbs and fallen trees with thick branches.

Answer:

the shelter made from nature for wild animals

Answer:

Kinetic energy is energy of motion, while temperature is a measure of that energy. I guess

The best compares kinetic energy and temperature is given below.

Kinetic energy is energy of motion, while temperature is a measure of that energy.

The energy posses due to motion of the partials or substance is called Kinetic energy. The relation between Kinetic energy and temperature is given as.

K.E = 3RT/2NA

Where, K.E = Average Kinetic energy

R = Gas constant

T = Temperature

NA = Avogadro's number

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Answer:

114

Explanation:

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The statement about the inequality that is NOT true is (A), a and b may be equal to each other.

This is because the inequality y> x-4 means that y must be greater than x-4. If a and b are equal, then y = x-4, which means that the inequality is not satisfied.

The other three statements are true because:

If 4 is subtracted from a, it will be greater than b because y> x-4 means that y must be greater than x.

If 4 is subtracted from b, it will be less than a because y> x-4 means that y must be greater than x.

If 4 is subtracted from both a and b, the inequality will still be true because y> x-4 means that y must be greater than x, even if x and b are both decreased by 4.

Therefore, the answer to the question is the statement a and b may be equal to each other.

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Complete question:

Guided Learning ar Inequalities in One Variable - Item 7601

Pre-Quiz

Practice

from a, it will be greater than b.

Post-Quiz

Finish

If the ordered pair (a, b) satisfies the inequality y> x-4, three of these statements are true. Which statement is NOT true?

a and b may be equal to each other.

If you subtract 4 from a, it will be greater than b.

If you subtract 4 from b, it will be less than a.

If you subtract 4 from both a and b, the inequality will still be true.

Answer:

Add or remove a proton

Explanation:

This is because if you add a neutron, Oxygen becomes an isotope. If you add or remove a valence electron, it becomes a positive or negatively charged ion. If you add or remove a proton, you take away its chemical identity. If you add a proton, Oxygen becomes Fluorine, take away a proton, it becomes Nitrogen

Answer:

Add or remove a proton

Explanation:

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Answer:

All of the above

Explanation: