At the heart of the stars, nuclear fusion merges _____ together in the nucleus of atoms to create new elements?

The symbol that of sodium atom that will be obtained by adding one proton to 23Na is 24Na.

Isotope is any of two or more forms of an element where the atoms have the same number of protons, but a different number of neutrons within their nuclei.

Thus, isotopes have the same atomic number but a different mass number.

Isotopes of the same element have atoms with the same number of protons but different numbers of neutrons.

Examples of isotopes are Carbon-12 and Carbon-14 where one posseses 6 neutrons and the other possesses 8 neutrons.

According to this question, an isotope of sodium has a formula of 23Na. This means that when a proton is added to the isotope, the formula of the sodium isotope will change by adding 1 to the mass number.

Therefore, the formula of the isotope will change from 23Na to 24Na.

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To get a dose of 0.1 gm (100 mg), 1.5 ml of sodium amytal solution must be injected intramuscularly (IM).

We can use the available concentration and the desired dose.

Given

First, we need to convert the desired dose from grams to milligrams:

0.1 g = 100 mg

Now, we can set up a proportion to find the volume of solution needed:

(100 mg) / (200 mg) = (x ml) / (3 ml)

Cross-multiplying and solving for x:

100 mg * 3 ml = 200 mg * x ml

300 mlmg = 200 mlmg

x ml = (300 ml*mg) / (200 ml)

x ml = 1.5 ml

So, To get a dose of 0.1 gm (100 mg), 1.5 ml of sodium amytal solution must be injected intramuscularly (IM).

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Answer:

18

Explanation:

2.50 litres of a 10.0 M solution require the preparation of 25.0 moles of ethylene glycol.

Excellent antifreeze, anti-boil, and anti-corrosive qualities are produced when antifreeze and water are mixed in a 50/50 ratio. The proportion of conventional ethylene glycol to water in severely cold conditions can reach 70% antifreeze, 30% water. The maximum antifreeze to water ratio when using DEX-COOL® is 60/40.

moles = concentration (M) x volume (L)

Given that the desired concentration is 10.0 M and the volume needed is 2.50 L, the setup for calculating the total number of moles of ethylene glycol can be written as:

moles = 10.0 M x 2.50 L

moles = 25.0 mol

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Answer:

The process of photosynthesis occurs when green plants use the energy of light to convert carbon dioxide (CO2) and water (H2O) into carbohydrates. Light energy is absorbed by chlorophyll, a photosynthetic pigment of the plant, while air containing carbon dioxide and oxygen enters the plant through the leaf stomata.

Answer:

a) 1.567 x 10^9

b) 2.36 x 10^(-5)

Species oxidized: Mg (magnesium)

Species reduced: Ag (silver)

Oxidizing agent: Ag (silver)

Reducing agent: Mg (magnesium)

In the given electron transfer reaction: 2Ag + Mg -> 2Ag+ + Mg²⁺

Species oxidized: Mg (magnesium)

Species reduced: Ag (silver)

Oxidizing agent: Ag (silver)

Reducing agent: Mg (magnesium)

The species being oxidized (Mg) loses electrons and undergoes oxidation, while the species being reduced (Ag) gains electrons and undergoes reduction. In this reaction, magnesium (Mg) is the reducing agent since it donates electrons and causes the reduction of silver ions (Ag+) to form elemental silver (Ag). On the other hand, silver (Ag) acts as the oxidizing agent since it accepts the electrons and causes the oxidation of magnesium (Mg) to form magnesium ions (Mg²⁺).

Overall, this reaction involves the transfer of electrons from magnesium to silver ions, resulting in the reduction of silver ions and the oxidation of magnesium.

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Answer:

False

Explanation:

Mixtures are a solute and solvent that are not chemically combined, therefore easily separated. Solutions are a solute and solvent combined together.

The exponential decay model is a mathematical representation of the decay process of a radioactive substance. In this case, we have an unknown radioactive element that decays into non-radioactive substances.

The model for the decay after t days is given by:

A(t) = A(0) * (1 - r)^t

Where:
- A(t) represents the amount of radioactivity remaining after t days
- A(0) represents the initial amount of radioactivity
- r represents the decay rate as a decimal (e.g., if the decay rate is 12%, r would be 0.12)
- t represents the number of days

Given that the radioactivity of the sample decreases by 12% in 30 days, we can use this information to solve for the decay rate, r.

First, let's substitute the given values into the exponential decay model:

0.88 = A(0) * (1 - r)^30

Next, we can solve for r. Taking the 30th root of both sides, we get:

(1 - r) = (0.88)^(1/30)

Simplifying further:

r = 1 - (0.88)^(1/30)

Now, we can substitute the value of r back into the exponential decay model to find the initial amount of radioactivity, A(0), if it is known:

A(t) = A(0) * (1 - r)^t

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The molecular formula of of tobacco that composed of C, H, and N, and A 0.005250 g sample of nicotine was combusted, producing 0.014242 g of CO₂ and 0.004083 grams of H₂O = C₁₀H₁₄N₂.

To determine the empirical formula, we have to divide each member of moles by the smallest one.

Number of C atoms = 3.237 x 10⁻⁴ / 0.646 x 10⁻⁴

= 5

Number of H atoms = 4.536 x 10⁻⁴ / 0.646 x 10⁻⁴

= 7

Number of N atoms = 0.646 x 10⁻⁴ / 0.646 x 10⁻⁴

= 1

Hence, the empirical formula = C₅H₇N

Now, determine the empirical formula mass:

Mass of C₅H₇N = (5 x C) + (7 x H) + (N)

= (5 x 12 + (7 x 1.008) + (14.007)

= 81.118 g/mol

Divide the molar mass of he compound by the empirical formula mass.

(160 ± 5 gr/mol) / 81.118 g/mol

≈ 2

Multiply the empirical formula by 2.

So, the molecular formula = C₁₀H₁₄N₂

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Answer: 1 mol C8H18 produces 9 mol H2O

Explanation: reaction : C8H18 + 12.5 O2 ⇒ 8 CO2 + 9 H2O

The density of borosilicate glass is different from the weighted average of the densities of its components because the density of a glass is influenced by its molecular structure and the way its atoms are arranged, rather than a simple weighted average of its components.

Borosilicate glass is a type of glass that contains boron trioxide, which makes it more resistant to thermal expansion and chemical corrosion. When the glass is formed, the components (such as silicon dioxide, boron trioxide, and other metal oxides) are combined at high temperatures, causing them to form a new amorphous material with a unique atomic structure.
The arrangement of atoms and bonding in borosilicate glass is not linear or consistent, and it can differ from the atomic arrangements found in the individual components. This irregular structure results in the overall density of the glass being different from a simple weighted average of the densities of its individual components.
In summary, the density of borosilicate glass is different from the weighted average of the densities of its components due to the unique molecular structure and atomic arrangements that occur when the glass is formed.

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Answer:

Explanation:

The responding variable always is measured against the variable that you have control over.

In this case, you have control over the volume of air.

The responding variable is the amount the plant has grown.  This would be a good long term experiment to try for a science fair or just because you might be interested. It's a good simple idea.

Answer:

1.72 M

Explanation:

Molarity is the molar concentration of a solution. It can be calculated using the formula a follows:

Molarity = number of moles (n? ÷ volume (V)

According to the information provided in this question, the solution has 58.7 grams of MgCl2 in 359 ml of solution.

Using mole = mass/molar mass

Molar mass of MgCl2 = 24 + 35.5(2)

= 24 + 71

= 95g/mol

mole = 58.7g ÷ 95g/mol

mole = 0.618mol

Volume of solution = 359ml = 359/1000 = 0.359L

Molarity = 0.618mol ÷ 0.359L

Molarity = 1.72 M

In the above intermediate chemical equation, oxygen will appear as follows: O₂(g) as a reactant (option B).

A chemical equation in chemistry is a symbolic representation of a chemical reaction where reactants are represented on the left, and products on the right.

According to this question, an intermediate chemical equation is presented as follows:

As observed in the above chemical equation, oxygen will react in its gaseous form i.e. as a reactant.

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Answer:

Independent Variables

Explanation:

These are changes that are made by the experimenter. They are factors that one is able to manipulate or control their values.

Answer:

11.9 g of nitrogen monoxide

Explanation:

We'll begin by calculating the number of mole in 6.75 g of NH₃. This can be obtained as follow:

Mass of NH₃ = 6.75 g

Molar mass of NH₃ = 14 + (3×1)

= 14 + 3

= 17 g/mol

Mole of NH₃ =?

Mole = mass /molar mass

Mole of NH₃ = 6.75 / 17

Mole of NH₃ = 0.397 mole

Next, we shall determine the number of mole of NO produced by the reaction of 0.397 mole of NH₃. This can be obtained as follow:

4NH₃ + 5O₂ —> 4NO + 6H₂O

From the balanced equation above,

4 moles of NH₃ reacted to produce 4 moles of NO.

Therefore, 0.397 mole of NH₃ will also react to produce 0.397 mole of NO.

Finally, we shall determine the mass of 0.397 mole of NO. This can be obtained as follow:

Mole of NO = 0.397 mole

Molar mass of NO = 14 + 16 = 30 g/mol

Mass of NO =?

Mass = mole × molar mass

Mass of NO = 0.397 × 30

Mass of NO = 11.9 g

Thus, the mass of NO produced is 11.9 g

almost every lab uses chemicals of some sort, chemical safety rules are a must. Following these policies helps employees avoid spills and other accidents, as well as damage to the environment outside of the lab.

Explanation:

We need to follow these because working in the laboratory is more dangerous and to avoid this we need to Know the precautions and dangers governing the lab to prevent accident

The mass of (NH4) 2S in the solution is : Mass = 0.0600 mol × 60.08 g/mol = 3.60 g.

The given molarity and volume of the solution can be used to calculate the number of moles of ammonium sulfide (NH4)2S.Then, the number of moles can be converted to mass using the molar mass of (NH4)2S.Mass of ammonium sulfide (NH4)2S in 3.00 L of a 0.0200 M solution is given by : Mass = moles × molar mass.The number of moles of (NH4)2S can be found using the equation:Molarity = Number of moles / Volume.Rearranging this equation, we get:Number of moles = Molarity × Volume Number of moles of (NH4)2S = 0.0200 M × 3.00 L.Number of moles of (NH4)2S = 0.0600 mol.The molar mass of (NH4)2S can be calculated by summing the molar masses of ammonium (NH4) and sulfide (S) ions.Molar mass of (NH4)2S = (2 × Molar mass of NH4) + Molar mass of S= (2 × 14.01 g/mol) + 32.06 g/mol= 60.08 g/mol.

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Based on the assertion and reasons given, it can be seen that the Assertion is true, but the reason is false.

Camphor and ammonium chloride are not separated because they are volatile substances. Hence assertion is true.

Camphor on heating sublimes, only when mixed with sodium chloride so the reason is false.

The bark and wood of the camphor tree were once used to make the chemical known as camphor.

Today, turpentine oil is typically used to make camphor. The fragrance of camphor is quite distinctive. It helps with symptoms like pain and itching by stimulating the nerves, it seems.

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Answer:

attractive smell and bright colours

Carotenoids are found in high concentrations in yellow and orange leaves or vegetables. These leaves and vegetables appear yellow or orange because of Reflect and Transmit.

Reflection and Transmission:

Reflection is the change in direction of a wave front at the interface between two different media in such a way that the wave front returns to the medium in which it was originally located. Common examples include reflections of light, sound, and water waves. According to the law of reflection, in specular reflection (e.g. a mirror) the angle at which the wave strikes the surface is equal to the angle at which it is reflected.

Transmission is defined as the process of transmitting light from any substance. Transmission is the movement of electromagnetic waves through any substance.

Example: When UV light hits a material, the electrons in the material's ground state enter a higher electronically excited state. When an electron in a higher state returns to its ground state, it transfers energy in the form of a photon.

Carotenoids

Carotenoids , also called tetraterpenoids, are yellow, orange, and red organic pigments produced by plants and algae, as well as some bacteria and fungi. Carotenoids give pumpkins, carrots, parsnips, corn, tomatoes, canaries, flamingos, salmon, lobster, shrimp, and daffodils their unique colors. All these organisms can produce carotenoids from fats and other basic organic metabolic components.

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Specific Heat of the metal will be = 4.184 J/C

Mass of metal = 28 g

Mass of water = 28 g

Rise in temperature = 23.8 - 19 = 4.8 C

Specific heat of water = 4.184 J/C

Let the specific heat of metal =S

The heat released by metal =mass of metal * specific heat of metal * Change in temperature

\(& =28\times S \times 4.8{ }^{\circ} \mathrm{C} \\& =134.4 S^{\circ} \mathrm{C}\)

Heat absorbed by water = mass of water x specific heat of water x change in temp. \(=28 \times 4.184 \times 4.8=562.3296 J\)

Using the principal of Caloriemeter:

We have, Heat released by metal = Heat absorbed by water

134.4S = 562.3296 =>4.184 J/C

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The correct question should be:

if we are heated a metal with 28g mass then we add it in a coffee cup with 28g water. the water temperature raised from 19 degree to 23.8 oc. what was the specific heat of the metal. the water specific heat of water is 4.184 j/g oc.

The moles of silver nitrate required to form 0.854 mol silver ion has been 0.854 mol.

The balanced chemical equation for the dissolution of silver nitrate has been:

\(\rm AgNO_3\;\rightarrow\;Ag^+\;+\;NO_3^-\)

The aqueous solution of silver nitrate has been dissociated into the constituent silver and nitrate ions.

In a balanced chemical equation, the coefficient has been equivalent to the moles of each reactant forming the moles of product.

From, the balanced equation,

\(\rm 1\;mol\;AgNO_3=1\;mol\;Ag\)

The given moles of Silver has been 0.854 mol. Thus, the moles of silver nitrate required has been given as:

\(\rm 1\;mol\;Ag^+=1\;mol\;AgNO_3\\0.854\;mol\;Ag^+=0.854\;\times\;1\;mol\;AgNO_3\\0.854\;mol\;Ag^+=0.854\;mol\;AgNO_3\)

The moles of silver nitrate required to form 0.854 mol silver ion has been 0.854 mol.

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Answer:

Not significant

Explanation:

I just did the test

The formulas represent ionic compounds and covalent compounds are:

Iconic Compound: COCl₂ , K₂O, NCF, LiBr, etc.

Covalent Compound: CO₂, H₂O, CH₄, SO₂, etc.

Iconic Compound:

In chemistry, an ionic compound is a compound composed of ions held together by electrostatic forces called ionic bonds. These compounds are usually neutral but are composed of positively charged ions, called cations, and negatively charged ions, called anions. These can be simple ions, such as sodium (Na+) and chloride (Cl-) in sodium chloride, or polyatomic compounds, such as the ammonium ion in ammonium carbonate (NH₄⁺) and carbonate ion (CO²⁻₃). An individual ion in an ionic compound usually has multiple nearest neighbors and therefore is not considered part of a molecule, but part of a continuous three-dimensional network. Ionic compounds usually form crystal structures in the solid state.

Ionic compounds containing basic hydroxide (OH-) or oxide (O2-) ions are classified as bases. Ionic compounds lacking these ions are also called salts and can form in acid-base reactions. Ionic compounds can also be prepared from constituent ions by solvent evaporation, precipitation, freezing, solid-state reactions, or electron transfer reactions of reactive metals with reactive non-metals such as gaseous halogens.

Covalent Compound:

A covalent bond is a chemical bond in which electrons are shared to form electron pairs between atoms. These pairs of electrons are known as covalent or bonding pairs. When atoms share electrons, a stable balance of attractive and repulsive forces between atoms is called a covalent bond. Covalent bonds also include many types of interactions, including σ-bonds, π-bonds, metal-metal bonds, archistic interactions, bent bonds, 3-centre 2-electron bonds and 3-centre 4-electron bonds. The term "covalent bond" appeared in 1939. The prefix co- means joint, linked by action, partnership, etc. Thus, covalent bond" essentially means that the atoms have a common "valency" as discussed in valence bond theory.

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Answer:

Chemists make observations on the macroscopic a scale that lead to conclusions about microscopic features

Explanation:

Many important chemical observations are made on the macroscopic scale. This is because, many of the scientific equipments available are not presently able to provide direct evidence about microscopic processes. Evidences obtained from macroscopic observations could serve as important insights into the nature of certain microscopic processes.

This is evident in the study of the structure of the atom. Most of the evidences that led to the deduction of the atomic structure were obtained from macroscopic evidence but ultimately provided important information about the microscopic structure of the atom.

Answer:

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Explanation: