13. Hydrogen and helium have both been used to fill balloons. Which property of helium
makes it the preferred choice to hydrogen?​

Answer:

Improvised health has been one of the main benefits of development. As humans, we need the primary aspects of life to keep us going. (food, water, oxygen) But scientificly we need health that will improve health. and Improved Health has been one of the main benefits of development. This benefit results partly from an increase in income and partly from scientific progress in the fight against disease and disability.

The process for elements lithium through about iron is called nucleosynthesis, specifically stellar nucleosynthesis, where heavier elements are formed through fusion reactions in the cores of stars.

The process you're referring to, which involves the formation of elements lithium through iron from lighter elements like hydrogen and helium, is called nuclear fusion. This occurs in the core of stars, where lighter elements combine under high temperatures and pressures to form heavier elements, releasing energy in the process.

The process of creating new atomic nuclei—the protons and neutrons that make up an atom's center—is known as nucleosynthesis. Within a few minutes after the Big Bang, the process of nucleosynthesis began. At that time, a soup of quarks and gluons known as a quark-gluon plasma condensed into neutron and proton.

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Answer:

The 1-kg ball accelerates twice as much as the 2-kg ball.

Explanation:

please add me as brainliest.....

Answer: Ocean-dwelling because whales don't live in lakes

Explanation:

(a) By using the formula \(K = 0.5 * m * v2\) to determine an object's kinetic energy, we can determine the electron's speed in the hydrogen atom's lowest energy state. This results in an effective current of \(3.52 x 10-13 A\) for this orbiting electron.

An electron's rate of motion through space is referred to as its speed. It is used to determine how fast something is moving and is normally stated in metres per second (m/s). A multitude of variables, including an electron's energy, mass, and exposure to electric and magnetic fields, can have a significant impact on how fast an electron moves. Electrons can move at rates that range from less than a metre per second to almost the speed of light in the setting of atomic and molecular physics. When free electrons are present in a substance, such as a metal, they can occasionally flow through it at extremely fast speeds, which increases the material's electrical conductivity.

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Explanation:

Sugar -  Pure substance

Magnesium Ribbon - Pure Substance

Vegetable soup  Heterogeneous mixture

Bath oil - Homogeneous mixture

Tin of assorted biscuits - Heterogeneous mixture

Peanuts and raisins - Heterogeneous mixture

Copper wire - Pure Substance

Bicarbonate of soda  (Baking soda)​ - Pure Substance

In aqueous solutions, hydrogen bonds have similar bond strength as ionic bond interactions. Thus option B is the answer.

In aqueous solutions, ionic interactions occur between positively and negatively charged ions, which are held together by electrostatic forces. These forces are relatively strong and are responsible for the high melting and boiling points of ionic compounds. Hydrogen bonds, on the other hand, are a type of dipole-dipole interaction between the partially positive hydrogen atom of one molecule and the partially negative atom of another.

The strength of hydrogen bonds is about 5-10% of the strength of covalent bonds, which is similar to the strength of ionic bonds in aqueous solutions. This makes hydrogen bonds the type of bond or force that has similar bond strength as ionic bond interactions in aqueous solutions. These type of bonds are found in many biomolecules like DNA and RNA, proteins and many other natural and synthetic compounds.

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4Al + 3O₂ ⇒ 2Al₂O₃

n(Al₂O₃) = m/M = 12/101.96 = 0.117693213mol

unknown/known = 2/4 = 1/2

n(Al) = n(Al₂O₃)/2 = 0.05884660651mol

m(Al) = n x M = 0.05884660651 x 26.98 = 1.59g (2dp)

Cooking any food.

Burning of wood.

Digestion of food.

Acid-base reaction.

Answer:

A

Explanation:

as something is heated, it gains kinetic energy

Answer: D. Synthesis

Explanation:

Sodium Oxide + Water = Sodium Hydroxide

folic Acid

Folic acid, often known as folate, is a water-soluble B vitamin that is necessary for the generation of healthy red blood cells and the regular functioning of the brain system. Folate is present in numerous foods, including leafy green vegetables, legumes, nuts, and grains. Numerous processed goods, including breakfast cereals, breads, and rice, contain it as well. Folic acid is essential for pregnant women because it prevents birth abnormalities. It is also crucial for people of all ages since it helps maintain the health and normal operation of the body's cells. Folic acid is also essential for the production and repair of DNA, as well as the breakdown of specific proteins. Without appropriate folic acid, the body cannot produce red blood cells effectively, which can result in anemia. It is essential to consume adequate amounts of folic acid through diet or supplementation.

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Answer:

Explanation:

3.81 m. = 150 inches.

I can't find explanation. Hope this is my best!

Answer:

See explanation

Explanation:

The reaction equation is;

C3H8 (g) + 5O2(g) -------> 4H2O(g) + 3CO2(g)

From the formula;

Total enthalpy of reactants = (ΔHf of Reactant 1 x Coefficient) + (ΔHf of Reactant 2 x Coefficient)

Total enthalpy of products= (ΔHf of Product 1 x Coefficient) + (ΔHf of Product 2 x Coefficient)

Hence;

Total enthalpy of reactants =[(-103.85 * 1) + (0 * 5)] = -103.85 + 0 = -103.85 KJ/mol

Total enthalpy of products= [(-393.51 * 4) +(-241.82 * 3)] = (-1574.04) + (-483.64) = -2057.68 KJ/mol

Answer:

they got protons, electrons, and neutrons

Explanation:

Answer:

Atoms consist of three basic particles: protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged).

Explanation:

The partial pressure of oxygen in the given gaseous mixture can be calculated by using Dalton's law of partial pressures. According to Dalton's law of partial pressures, the total pressure exerted by a mixture of gases is equal to the sum of the partial pressures of the individual gases present in the mixture.

Mathematically, P total = P1 + P2 + P3 +...where P total is the total pressure, P1, P2, P3,..are the partial pressures of individual gases in the mixture. The formula for calculating partial pressure of a gas is:P gas = (Xgas)(Ptotal)where X gas is the mole fraction of the gas and P total is the total pressure of the mixture.

Given: The gaseous mixture contains 38.6 % nitrogen by mass. Therefore, the mass fraction of oxygen in the mixture can be calculated as follows:

Mass fraction of nitrogen = 38.6 %

Mass fraction of oxygen = 100 % - 38.6 % = 61.4 %

Therefore, the mole fraction of oxygen (XO2) in the mixture can be calculated as:

Mole fraction of oxygen = (mass fraction of oxygen)/(molar mass of oxygen/molar mass of air)

= (0.614)/(32/28.8) = 0.691

The mole fraction of nitrogen (XN2) in the mixture can be calculated as:

Mole fraction of nitrogen = 1 - XO2 = 1 - 0.691 = 0.309

Now, the partial pressure of oxygen (PO2) can be calculated using the formula:

Pgas = (Xgas)(Ptotal)PO2 = (0.691)(0.803 atm) = 0.555 atm

Therefore, the partial pressure of oxygen in the mixture is 0.555 atm.

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Answer:

The answer is in the explanation.

Explanation:

The KHP is an acid used as standard in titrations to find concentration of bases as NaOH.

The reaction that explain this use is:

KHP + NaOH → KNaP + H2O

where 1 mole of KHP reacts per mole of NaOH

That means, at equivalence point of a titration in which titrant is NaOH, the moles of KHP = Moles of NaOH added

With the moles of KHP = Moles of NaOH and the volume used by titrant we can find the molar concentration of NaOH.

The moles of KHP are obtained from the volume and the concentration as follows:

Volume(L)*Concentration (Molarity,M) = moles of KHP

If the concentration is more or less than 0.100M, the moles will be higher or lower. For that reason, we need to know the concentration of KHP but is not necessary to be 0.100M.

Answer:

When two or more atoms chemically bond together, they form a molecule. The bonds between the two hydrogen atoms and the oxygen atom in a molecule of water are covalent bonds.

Explanation:

Helium aka H10 is in the middle of all the protons and neutrons when you add one proton with one electron 2hint. or the second one is pretty clear it has a great mass Md the 3rd one well u should know lol

Answer:

Helium aka H10 is in the middle of all the protons and neutrons when you add one proton with one electron 2hint. or the second one is pretty clear it has a great mass Md the 3rd one well u should know lol

Explanation:

Answer:

Explanation:

1. The element you selected is Sodium. some of the physical properties are

i. Sodium has a strong metallic lustre

ii. Sodium are usually silver white in color

iii. Sodium is soft it can be cut with knife

iv. Sodium are malleable and ductile.

v.  Sodium conduct electricity

Sodium belong to group 1 elements which are called Alkali metals. Sodium have one valency electron and it gives this electron easily during bonding . This is one reason sodium and other alkali metals are very reactive. Sodium can instantly be oxidized by water.  Sodium has a relative atomic mass of approximately 23 amu.

2. There are various models that describe atoms .This models includes John Dalton models, J.J Thompson model, Ernest Rutherford model, Bohr's models etc. This models made us understand the role and location of each sub atomic particles. The models shed more light on subatomic particles like electron which revolve around the nucleus.  It provide more information on what contribute to the weight of an atom.

3. The proton , neutron and electron are subatomic particles of an atom. The proton and the neutron are located at the nucleus of an atom.  The proton and neutron contributes majorly to the weight of an atom. The proton is positively charge while neutron has no charge.

Electron is found to move around the nucleus in cloud. The electron is negatively charge. The electron determines bonding of atoms. An atom is electrically neutral if the number of proton is equal to the number of electron.

4. The four fundamental forces includes weak nuclear forces , strong nuclear forces , gravity and electromagnetic forces.

Weak nuclear forces is responsible for particle decay .Nuclear forces don't play a role in chemical reaction . If they are involve in a reaction it becomes nuclear reaction not chemical reaction.

Strong nuclear forces causes a strong nuclear interaction and it is the strongest among the 4 fundamental forces. This strong force only operate when subatomic particles are much closer to each other.

Gravity force is too weak to affect chemical reaction much. The gravity forces involves the interaction between two objects with energy and mass.

The electromagnetic force act between charged particles like negatively charged electron and positively charged proton. Electromagnetic force is the most important force in chemical bonding as it depends on the arrangement of atoms and the state of their electron. Electromagnetic forces exist in various forms like the covalent bond, metallic, ionic , dipole dipole, hydrogen bonds and many more. The major force involve in chemical bonding is the electromagnetic force.

The list that gives the correct symbols for the elements phosphorus, potassium, silver, chlorine, and sulfur in that order is P, K, Ag, Cl, S (option D).

Chemical symbol is the 1- to 3-letter international code for a chemical element.

Element symbols for chemical elements normally consist of one or two letters from the Latin alphabet and are written with the first letter capitalised.

According to this question, five elements are given. The chemical symbols of each element is as follows;

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The binder found in high-fiber foods that inhibits the absorption of iron and zinc is oxalic acid Choose raw fruits and vegetables instead of juice, and consume the peels. Alternative fiber sources include whole buckwheat, whole wheat couscous, quinoa, bulgur, wheat germ, chia water seeds, hemp seeds, lentil pasta, and edamame pasta.

Popcorn is a complete grain. Serve it low-fat and without butter for a healthy snack option. It is a white crystalline substance that dissolves colorlessly in water. It got its name from the fact that early researchers obtained oxalic acid from blooming plants of the genus Oxalis, sometimes known as wood-sorrels.

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Answer:

3785.4g

Explanation:

210.3 mol of water are

210.3 mol × (18.0g/mol) = 3785.4g

The statement that the amygdala tells your body that it should digest food is false.

Near the base of the brain, the amygdala is a cluster of almond-shaped cells.

One in each hemisphere (or side) of the brain, everyone has two of these cell types.

The amygdala aid in the definition and regulation of emotions.

Thus, the statement that the amygdala tells your body that it should digest food is false.

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The equilibrium constant of the reaction from the calculation that has been done is 0.154

The concentrations (or partial pressures) of reactants and products in chemical equilibrium for a specific chemical reaction are related by the equilibrium constant (K), a mathematical equation. It quantifies the degree to which an equilibrium has been reached in a reaction.

We have the equation of the reaction as;

A(g) + B(g) ⇔C(g)

Thus;

Keq = 45.83/11.23 * 26.50

Keq = 0.154

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To confirm Newton’s Second Law using a laboratory report, you will need to conduct an experiment using a simulation and gather data. Newton’s Second Law states that force equals mass times acceleration.

Here's how you can write a laboratory report to confirm Newton’s Second Law using the simulation and gathered data. Introduction: This section should include a brief explanation of the theory behind Newton’s Second Law and what you will be testing in your experiment. It should also include your hypothesis.

Procedure: This section should explain the steps you took to conduct your experiment. In this case, it would involve using the simulation to apply different forces to objects with different masses and measuring their acceleration.

Data: This section should present the data you collected during your experiment. It can be presented in tables or graphs, and should include measurements of force, mass, and acceleration for each trial.

Analysis: This section should analyze the data you collected to determine if it supports your hypothesis and confirms Newton’s Second Law.

Conclusion: This section should summarize your findings and draw conclusions based on the data you collected. It should also discuss any errors or limitations of the experiment and suggest areas for further research.

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I'm really sorry but you didn't provide any options...

Answer:

The number of nitrogen molecules inside of berylluim nitrite are 5 cells.

Explanation: