Describe a method to calculate the average atomic mass of using only the atomic masses of
lithium-6=6.01512amu
and lithium-7= 7.01600amu

Answer:

670.45 K

Explanation:

Given that,

Initial volume, V₁ = 1.22 L

Initial temperature, T₁ = 286 K

Final volume, V₂ =  2.86 L

We need to find the new temperature of the gas. The relation between the volume and the temperature is given by :

\(\dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}\\\\T_2=\dfrac{V_2T_1}{V_1}\\\\T_2=\dfrac{2.86\times 286}{1.22}\\\\T_2=670.45\ K\)

So, the new temperature of the gas is equal to 670.45 K.

In addition to dispersion forces, dipole-induced dipole intermolecular forces are present in a solution between methanol and bromine .

So , second option  is correct one .

The intermolecular force of attraction are the electrostatic in nature and include van der waals forces and hydrogen bonds . Molecule in liquids are held to another molecules by intermolecular interaction , which are weaker than intramolecular interaction that hold atoms within molecules and polyatomic ions.

A liquid that evaporates at a slow rate exhibits strong intermolecular forces . This happens because the energy applied to the liquid would need more time to separate the molecules of a substance that are strongly attached.

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A, O and D

and its sulfur luv ♡ not sulphur

The use of heat and alcohol to disinfect medical equipment is because both heat and alcohol are effective at killing microorganisms and bacteria.

Heat can be used to sterilize equipment by exposing it to high temperatures for a certain period of time, while alcohol, specifically ethanol and isopropyl alcohol, can be used to disinfect surfaces by denaturing the proteins and dissolving the lipid membranes of microorganisms.

Milk is not given to someone who accidentally ingests a heavy metal ion such as silver or mercury. Ingestion of heavy metal ions like silver or mercury can cause serious health problems and requires prompt medical attention. Milk is not an effective treatment for heavy metal poisoning, and chelating agents or other specific treatments are used for removing heavy metals from the body.

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Answer:

Are filled with chlorophyll.

Explanation:

Chlorophyll is found inside plant cells in tiny oval-shaped bodies called chloroplasts.

Answer:

Are filled with chlorophyll.

Explanation:

Answer:

C.0.28 V  

Explanation:

Using the standard cell potential we can find the standard cell potential for a voltaic cell as follows:

The most positive potential is the potential that will be more easily reduced. The other reaction will be the oxidized one. That means for the reactions:

Cu²⁺ + 2e⁻ → Cu E° = 0.52V

Ag⁺ + 1e⁻ → Ag E° = 0.80V

As the Cu will be oxidized:

Cu → Cu²⁺ + 2e⁻

The cell potential is:

E°Cell = E°cathode(reduced) - E°cathode(oxidized)

E°cell = 0.80V - (0.52V)

E°cell = 1.32V

Right answer is:

The way in which temperature leads to weathering of rocks is as follows: Rocks expand and contract when they are heated and cooled which cause them to break (option C).

Rock weathering is the mechanical or chemical breaking down of rocks in situ by weather or other causes.

Once a rock has been broken down, a process called erosion transports the bits of rock and minerals away. Water, acids, salt, plants, animals, and changes in temperature are all agents of weathering and erosion.

Changes in temperature cause rock to expand (with heat) and contract (with cold). As this happens over and over again, the structure of the rock weakens. Over time, the rock crumbles.

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The percent ionization of a solution having a pH of 4.35 and an initial weak acid concentration of 0.00019 is 0.00021%.

To calculate this, first calculate the [H3O+] concentration.

This can be done by taking 10 raised to the power of the pH value, which in this case is 10^-4.35 = 3.2x10^-5 M.

Then, calculate the ionization fraction (alpha) using the equation alpha = [H3O+]/[HA], where [HA] is the initial weak acid concentration. In this case, alpha = 3.2x10^-5/0.00019 = 0.00021.

Finally, convert the ionization fraction to percent ionization using the equation Percent Ionization = 100 * alpha.

Thus, the percent ionization of the given solution is 0.00021 * 100 = 0.021%.

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The amount of KNO₃ would dissolve in 100g of water at 50 degrees celcuis to make a saturated solution is 44 g.

To create a saturated solution of KNO₃ in 100g of water at 50 degrees Celsius, the following steps should be taken:

Step 1: Find out the mass of the solvent in the saturated solution.

The solvent is water in this instance. So, using the formula for the mass of a solution, we can calculate the mass of the solvent in the saturated solution as follows:

Mass of solvent = Mass of solution - Mass of solute

= 100 g - Mass of KNO₃

Step 2: Determine the amount of solute that would be dissolved in the solution to make it saturated.

The mass of KNO₃ that would dissolve in 100 g of water at 50°C to create a saturated solution is 56g/100g of water.

Step 3: Calculate the mass of KNO₃ that would dissolve in 100g of water to make a saturated solution.

Mass of KNO₃ = Solubility of KNO₃ × Mass of solvent

Mass of KNO₃ = 56 g/100 g × (100 g - Mass of KNO₃)

Now, let's solve for Mass of KNO₃;

56 = 56g(100-Mass of KNO₃)/100100 - Mass of KNO₃ = 100

Multiply both sides of the equation by 100 to obtain;

5600 - 100 Mass of KNO₃ = 100

Mass of KNO₃ = 5600/10100 - 56

= 44 g

Therefore, 44 g of KNO₃ would dissolve in 100g of water to make a saturated solution.

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Answer:

-400.3 kJ/mol

Explanation:

Answer:

Prairie dog#3

Explanation:

:)

Based on the location on the periodic table, potassium has the same number of valence electrons as sodium so it will explode in water (option B).

The periodic table is a tabular chart of the chemical elements according to their atomic numbers so that elements with similar properties are in the same group (column).

On the periodic table, elements in the same group exhibits the same chemical properties because they possess the same number of valence electrons.

According to this question, when sodium (Na) is mixed with water, an explosion takes place. Since pottasium and sodium are in the same group, it will also explode when in a reaction with water.

Therefore, based on the location on the periodic table, potassium has the same number of valence electrons as sodium so it will explode in water.

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Answer:

Here is one way: Add water to the mixture. Only the sugar dissolves. This is a physical change.

Explanation:

The sugar would dissolve in water. You could then pour off the solution and wash the remaining sand with a bit more water. Heat the water to evaporate it from the sugar, and the two are separated.

Answer:

A

Explanation:

the salt mixes with the water while the sand does not

P-aminophenol has a molar mass of 109.13 g/mol. Acetaminophen has a molar mass of 151.17 g/mol. Acetic anhydride has a capacity of 1.1 mL.

The mass of acetaminophen, stated as 0.157g, must be multiplied by the molar mass of acetaminophen to get the theoretical yield. It weighs 151.2g in this case. The theoretical yield thus becomes 0.217g.

A measurement called production yield is obtained by dividing the number of high-quality parts produced by the total number of parts started in production.

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The value of x is 2  and the formula of compound SFₓ is SF₂.

The Law Of Multiple Proportions was given by Dalton in 1803.

According to this law, when two elements can combine to form more than one compound, the masses of one element that combine with a fixed mass of the other element, are in the ratio of small whole numbers.

This law is illustrated by the following example:

Hydrogen combines with oxygen to form two compounds, water, and hydrogen peroxide.

Hydrogen + Oxygen ⇒ Water

    2g             16g           18g

Hydrogen + Oxygen ⇒ Hydrogen Peroxide

   2g               32g               34g

Here, the masses of oxygen (i.e., 16 g and 32 g), which combine with a fixed mass of hydrogen, bear a simple ratio, i.e., 16:32 or 1: 2.

Similarly, the ratio of the mass of fluorine per gram of sulfur in the two compounds is 1.18/3.55 ≈ 1/3

As the ratio of fluorine in the two compounds is 1:3, then according to the law of multiple proportions, the number of fluorine atoms in SFₓ should be 1/3rd of the number of fluorine atoms present in SF₆ which is 6/3=2.

Thus, the formula of compound SFₓ is SF₂.

Therefore, the value of x is 2 and the formula of compound SFₓ is SF₂.

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Answer:

B. Food can be produced in larger amounts for more people to eat.

Explanation:

Commercial farming mechanizes operations controls diseases and pests, enabling farms to produce more

Answer:

food can be produced in larger amounts for more people to eat.

Explanation:

you're welcome

4K+O2-----------2K2O

Static charge is developed within a body temporarily with an induced polarization by rubbing on his leg . Electrons are exchanged from his hand  to the door when touched .

When two materials rub against each other in which one to be  good conductor, they will attract by the induced polarization. Rubbing causes the free electrons in the condutor to be transferred towards the surface in contact.

This will cause a deformation that, the random charges in the material get polarized where the electrons from one surface will repel to the opposite pol and positive charges will align in a pole close to the charged body.

This charge separation causes the positive pole of the metal gets attracted into the hand. Hence, the electrons from the hand move to the positive pole of metal and the spark  generate in the opposite direction.

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When discussing distance in the solar system,you use Relative Distance.This tells you the space between two objects with location.

D. Relative distance

The relative distance is the distance that you are felt to cover up, taking the time used to obtain there. Distance relative to a particular reference point, typically one in motion.

Relative distance is calculated measuring distance, using metrics such as time, effort, or cost.

In space, Relative distance means how far apart the planets are when compared to each other and the sun.

Thus, the correct option is D.

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This reaction is neutralization reaction.
2HNO3+2KOH⇒ 2KNO3+2H2O

What is neutralization reaction?

A neutralization reaction is a type of chemical reaction in which an acid and a base react with one another to form a salt and water. The acid and the base each donate one or more protons (H+ ions) to form a neutral compound. This type of reaction is important in many everyday applications, from the neutralization of stomach acid to the processing of industrial waste.

Acid+Base⇒Salt+Water

The given reaction is neutralization reaction because potassium nitrate salt is formed, and water is produced.

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The strong acid you are referring to is nitric acid (HNO3).

Nitric acid (HNO3) is a highly corrosive and volatile acid that has a strong affinity for reacting with organic materials. It is commonly used in the production of explosives such as TNT (trinitrotoluene) and gun cotton (nitrocellulose).

Nitric acid's ability to react explosively with organic materials is due to its strong oxidizing properties. When it comes into contact with organic compounds, such as hydrocarbons, it initiates a highly exothermic reaction, releasing a large amount of energy. This energy release is what makes nitric acid a valuable component in the creation of explosive materials.

In the first step of the reaction, nitric acid donates a proton (H+) to the organic material, causing it to break down and release electrons. At the same time, nitric acid is reduced, gaining electrons itself. This step is followed by a series of complex reactions involving the rearrangement of atoms and the formation of new chemical bonds.

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The empitical formula shows the simplest ratio of elements in a compound (not the total number of atoms in the molecule).

So to find the empirical formula we need to calculate how many moles of each atom we have in this sample. Then we will see the ratio of each element.

We are given the mass, so to convert it to moles we use the molar mass. For this we go to the periodic table and see that the values for each element are:

Na (sodium): 22,99 g/mol

H (hydrogen): 1 g/mol

P (phosphorus): 25,81 g/mol

So we calculate the moles of each element as follows:

And as we see, for every 0.833 moles of Na we have the same number of moles of P, so the ratio of these elements in the molecule is 1 to 1.

As for the hydrogen:

So the ratio Na to H is 1 to 2.

Now we can write the empirical formula as follows=

Answer:

The balanced chemical equation for the reaction between BaCl2 and Na2SO4 is:

BaCl2 + Na2SO4 → 2 NaCl + BaSO4

This equation shows that one mole of BaCl2 reacts with one mole of Na2SO4 to produce two moles of NaCl and one mole of BaSO4. Therefore, to determine how many moles of NaCl can be produced from 2.5 moles of BaCl2, we need to use the stoichiometry of the reaction.

Steps:

Step 1: Write down the balanced chemical equation for the reaction between BaCl2 and Na2SO4.

BaCl2 + Na2SO4 → 2 NaCl + BaSO4

Step 2: Identify the stoichiometric ratio of BaCl2 to NaCl from the balanced chemical equation.

From the balanced chemical equation, we see that 1 mole of BaCl2 produces 2 moles of NaCl.

Step 3: Calculate the number of moles of NaCl produced from 2.5 moles of BaCl2.

Using the stoichiometric ratio, we can calculate the number of moles of NaCl produced from 2.5 moles of BaCl2 as follows:

2.5 moles BaCl2 x (2 moles NaCl / 1 mole BaCl2) = 5 moles NaCl

Therefore, 2.5 moles of BaCl2 can produce 5 moles of NaCl.

Answer:

A big load of icecream/ loaded cake.

Explanation:

Answer:

Filtration and evaporation

Explanation:

A mixture of sand, pink sugar and water can be separated by filtration and evaporation.

The pink sugar is already dissolved in the water but the sand remains undissolved in the water hence it can be filtered off. The filtrate now contains the sugar.

The sugar is obtained from the filtrate by evaporation of the solution to yield the solid pink sugar and steam which can be condensed again to give liquid water.

Answer:

Explanation:

air is considered as a mixture of gases because it contains many gases. They are :

78 % Nitrogen

21 % oxygen

And 1 % other gases

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The correct formula of the oxide that forms when X burns in oxygen is X2O3.

Ionization energy is defined as the energy required to remove an electron from an atom. There are as many ionization energies present in an atom as there are electrons in that atom.

However, we can know the ionization energy values that belong to electrons in the outermost shell because they lie close together. If we go further into the inner shells, there is a sudden quantum jump in ionization energy values.

The element X must have three valence electrons because  631 ,1235, 2389 all refer to ionization energies of electrons in the valence shell. As we get into a core shell, there is a sudden jump hence the fourth and fifth ionization energies are 7089 and 8844 respectively.

The correct formula of the  oxide that forms when X burns in oxygen is X2O3.

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a. The Lewis structure for SCl₂ is S-Cl-Cl with a lone pair on sulfur. The VSEPR theory predicts a bent or V-shaped molecular geometry.

b. The Lewis structure for PI₃ is P-I-I-I with two lone pairs on the central phosphorus atom. The VSEPR theory predicts a trigonal pyramidal molecular geometry.

c. The Lewis structure for Cl₂CO is O=C=Cl with no lone pairs. The VSEPR theory predicts a linear molecular geometry for Cl2CO.

d. The Lewis structure for NH₂Cl is H-N-Cl with two lone pairs on the nitrogen atom. The VSEPR theory predicts a trigonal pyramidal molecular geometry.

e. The Lewis structure for SiCl₃Br is Br-Si-Cl-Cl-Cl with no lone pairs. The VSEPR theory predicts a trigonal pyramidal molecular geometry.

f. The Lewis structure for ONCl is O=N-Cl with no lone pairs. The VSEPR theory predicts a linear molecular geometry.

To draw the Lewis structure, you need to determine the number of valence electrons for each atom in the molecule and then arrange them to form covalent bonds while fulfilling the octet rule (except for hydrogen, which follows the duet rule). Once the Lewis structure is determined, you can use the VSEPR theory to predict the molecular geometry based on the arrangement of electron pairs around the central atom.

In each case, the molecular geometry is determined by the number of bonding and lone pairs of electrons around the central atom. The VSEPR theory provides a model for predicting the shapes of molecules based on the repulsion between electron pairs.

The molecular geometries predicted by the VSEPR theory are as follows:

a. SCl₂: Bent or V-shaped

b. PI₃: Trigonal pyramidal

c. Cl₂CO: Linear

d. NH₂Cl: Trigonal pyramidal

e. SiCl₃Br: Trigonal pyramidal

f. ONCl: Linear

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