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If you calculated 41.0 ÷ 0.302, how many significant figures would be in the answer?

a. 1
b. 2
c. 3
d. 4

Carlotta can respond by explaining the difference between a physical mixture and a chemical compound. The main difference between a physical mixture and a chemical compound lies in their composition and properties.

A physical mixture, also known as a mixture, is a combination of two or more substances that are physically combined but retain their individual chemical properties. In a physical mixture, the substances can be present in varying proportions, and they can be separated by physical means, such as filtration or evaporation.

Each component of the mixture retains its original properties, and no new substances are formed. Examples of physical mixtures include saltwater, air, and a bag of mixed nuts.

On the other hand, a chemical compound is a substance composed of two or more different elements that are chemically combined in a fixed ratio. Chemical compounds are formed through chemical reactions, during which the atoms rearrange and form new chemical bonds.

The resulting compound has unique properties distinct from its individual elements. Chemical compounds have a definite composition and cannot be separated into their constituent elements by physical means alone. Examples of chemical compounds include water (H₂O), sodium chloride (NaCl), and carbon dioxide (CO₂).

In summary, A physical mixture is a combination of substances that can be separated by physical means and retains the individual properties of its components. A chemical compound is formed through a chemical reaction, has a fixed composition, and exhibits unique properties different from its constituent elements.

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Answer:

Proton number of the supposed discovery debunked the theory.

Explanation:

Proton number of an element is also its atomic number.

For the element in question to have had a proton number that wasn't 119, it could not have been a new element.

Furthermore, the characteristics described (proton number especially) describe exactly the Germanium element.

I believe this was helpful.

Answer: different ions of an element, the answer is A

Explanation: Took the quiz

Answer:

different ions of an element, the answer is A

Explanation:

edge 2022

All of the properties such as ice floating on water, while most solids would sink when placed in its liquid are all due to the structure of the compounds.

The structure of the compounds includes the bonding angle, the type of bonds, the size of the molecule,  the interactions between the molecules etc.  Slight changes in the chemical structure and affect the properties if the compound.

Isomeric compounds with the same  chemical formula but different structures can have different melting and boiling point and differ in reactivity and flammability.

Another common change in isomers are with the double bonds.  A double bond can be in the cis formation or in the trans formation, and this will affect its properties as trans isomers will be having high melting point than the cis isomer.

Thus, structure of compounds  do determine the properties of the compounds.

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Answer:

a units

Explanation:

i do rsm and its right

Answer:

a units.

Explanation:

If someone asks, "How many units are between 0 and 3?" you're going to say 3, right?

The oxidizing agent in the reaction Fe + \(AgNO_3\)→ \(Fe(NO_3)_3\) + Ag is option a \(AgNO_3.\)

A redox reaction is one in which the oxidation states of two species undergo changes. Iron is oxidized in the reaction, while silver nitrate is reduced. One of the reactants is being reduced, whereas the other is being oxidized.The oxidizing agent is the species that is being reduced, and it is the species that accepts electrons.

Fe is being oxidized in this reaction. Therefore, it cannot be the oxidizing agent, nor can\(Fe(NO_3)_3\). In contrast, \(AgNO_3.\)  is being reduced, which means it is accepting electrons. This is why\(AgNO_3.\)  is the oxidizing agent.The correct answer is  option a.

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The pH of a solution prepared by adding 10 mL of 0.002 M KOH(aq) to 10 mL of distilled water is closest to 12.

The pH of a solution depends on the concentration of hydrogen ions (H+) present. In this case, 10 mL of 0.002 M KOH(aq) is added to 10 mL of distilled water. KOH is a strong base that dissociates completely in water to produce hydroxide ions (OH-). Since KOH is added in excess, the resulting solution will have an excess of OH- ions.

The OH- ions react with the H+ ions present in water in a neutralization reaction, forming water molecules (H2O). This reaction reduces the concentration of H+ ions in the solution, resulting in a higher pH.

Since the excess OH- ions will increase the pH, the solution will be basic. Among the given options, the closest pH value to a basic solution is 12.

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A physical Change

Explanation:

BECAUSE the dissolving material can solidify after a while

A chemical change involves a chemical reaction and the formation of new products...

In contrast, dissolving sugar or another covalent compound is a physical change because chemical bonds are not broken and new products are not formed...

If you dissolve sugar in water, you get sugar molecules in water.

so therefor its a PHYSICAL CHANGE and not a chemical change

Answer:

0.39017 moles

Explanation:

a mole is 6.023×10^23

(2.35×10^23)÷(6.023×10^23)=0.39017

Let us take our minds back to the kinetic theory of matter. Recall that the particles that compose matter are in constant random motion and the solids are arranged in a definite pattern while the particles of a gas are in random motion.

As such, the zinc has its atoms in a fixed pattern while the hydrogen atoms are roaming freely in the gaseous state.

Given that;

Amount of the acid = 10.95 g/36.5 g/mol = 0.3 moles

Amount of the zinc = 1g/65 g/mol = 0.015 moles

Given the reaction equation; \(Zn(s) + 2HCl(aq) ------ > ZnCl_{2} (aq) + H_{2}(g)\)

1 mole of Zn reacts with 2 moles of acid

0.015 moles of zinc reacts with x moles of acid

x =0.015 moles * 2 moles / 1 mole

= 0.03 moles

Thus, the zinc is the limiting reactant.

1 moles of the zinc produces 1 mole of the hydrogen

The amount of the hydrogen produced =  0.03 moles * 2 g/mol

= 0.06 moles of hydrogen

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The amount of concentrated solution needed is (0.286 M)(65 mL) / C M, and the amount of water needed is 65 mL minus the volume of the concentrated solution.

To calculate the molarity of Kool Aid desired, we need to determine the number of moles of Kool Aid powder and sugar in the package. Since the molecular formula for sugar is C12H22O11, we can calculate its molar mass as follows:

Molar mass of C12H22O11 = (12 * 12.01) + (22 * 1.01) + (11 * 16.00)

= 144.12 + 22.22 + 176.00

= 342.34 g/mol

Given that the package contains 4.25 grams of Kool Aid powder, we can calculate the number of moles of Kool Aid powder using its molar mass:

Number of moles of Kool Aid powder = Mass / Molar mass

= 4.25 g / 342.34 g/mol

≈ 0.0124 mol

Similarly, for the sugar, which has a molar mass of 342.34 g/mol, we can calculate the number of moles of sugar using its mass:

Number of moles of sugar = Mass / Molar mass

= 192.00 g / 342.34 g/mol

≈ 0.5612 mol

Now, to calculate the molarity of the desired Kool Aid solution, we need to determine the volume of water. Given that 1.06 quarts is equal to 1 liter, and we have 2.00 quarts of water, we can convert it to liters as follows:

Volume of water = 2.00 quarts * (1.06 liters / 1 quart)

= 2.12 liters

To find the molarity, we use the formula:

Molarity (M) = Number of moles / Volume (in liters)

Molarity of Kool Aid desired = (0.0124 mol + 0.5612 mol) / 2.12 L

≈ 0.286 M

To prepare 65 mL of the desired molarity, we can use dilution calculations. We need to determine the volume of concentrated solution and the volume of water needed.

Let's assume the concentration of the concentrated Kool Aid solution is C M. Using the dilution formula:

(C1)(V1) = (C2)(V2)where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume.

Given that C1 = C M and V1 = V mL, and we want to prepare a final volume of 65 mL (V2 = 65 mL) with a final concentration of 0.286 M (C2 = 0.286 M), we can rearrange the formula to solve for the volume of the concentrated solution:

(C M)(V mL) = (0.286 M)(65 mL)

V mL = (0.286 M)(65 mL) / C M

So, the amount of concentrated solution needed is (0.286 M)(65 mL) / C M, and the amount of water needed is 65 mL minus the volume of the concentrated solution.

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Answer:

false i am pretty sure because dead flowers.

The correct option is C;  II and III

The gases obtained from a landfill sites are ammonia, hydrogen sulfide, methane, and carbon dioxide.

Of these gases, ammonia and hydrogen sulfide are responsible for the odor at  landfill sites.

The odor from burning landfill gas can have deleterious effects on the health of residents owing to its smelly odors.

Also, many air pollutants are produced when the constituents of landfill gas  are burnt.

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Answer:

gas doesn't have a definite volume

The substances required for the production of illicit drugs vary depending on the type of drug being produced. For example, methamphetamine production typically involves the use of chemicals such as pseudoephedrine, anhydrous ammonia, and lithium, while cocaine production requires coca leaves and other chemicals like hydrochloric acid.

Other illicit drugs like heroin, ecstasy, and LSD also require specific substances for production. It is important to note that the production of illicit drugs is illegal and poses significant health and safety risks.

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Answer:

25%  

Explanation:

I assume you menat 20 cm^3 of water

5 gm / 20 gm = 25 %

The given quantity is 244.0 mL of 1.04 M NaOH. This means that there are 1.04 moles of sodium hydroxide per liter of solution.  the number of moles of NaOH in 244.0 mL of 1.04 M NaOH solution is: 0.253 moles

To calculate the number of moles of NaOH in 244.0 mL of solution, we need to convert mL to L and then use the concentration formula:moles = concentration * volume. First, we convert 244.0 mL to liters: 244.0 mL * (1 L / 1000 mL) = 0.244 L

Now we can calculate the number of moles of NaOH: moles = 1.04 M * 0.244 L = 0.253 moles. Therefore, there are 0.253 moles of NaOH in 244.0 mL of 1.04 M NaOH solution.

It's important to note that the concentration of a solution is expressed in units of moles per liter (M or molarity). This tells us the number of moles of solute (in this case NaOH) dissolved in one liter of solution. The volume of the solution is usually expressed in liters (L) or milliliters (mL).

In addition to using the appropriate units, it's important to pay attention to significant figures when performing calculations. In this case, the given quantity has four significant figures, so we should report our answer to the same number of significant figures.

Therefore, the number of moles of NaOH in 244.0 mL of 1.04 M NaOH solution is: 0.253 moles (rounded to four significant figures)

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There are approximately 1.238 × 10^24 atoms in 2.05 moles of hydrogen in its monoatomic state.

To determine the number of atoms in 2.05 moles of hydrogen in its monoatomic state, we need to use Avogadro's number, which states that there are approximately 6.022 × 10^23 atoms in one mole of any substance.

Given that we have 2.05 moles of hydrogen, we can calculate the number of atoms using the following steps:

Determine the number of moles of hydrogen:

Number of moles = 2.05 moles

Use Avogadro's number to calculate the number of atoms:

Number of atoms = Number of moles × Avogadro's number

Number of atoms = 2.05 moles × (6.022 × 10^23 atoms/mole)

Performing the calculation:

Number of atoms = 2.05 × 6.022 × 10^23 atoms

Number of atoms = 1.238 × 10^24 atoms

Therefore, there are approximately 1.238 × 10^24 atoms in 2.05 moles of hydrogen in its monoatomic state.

It's important to note that hydrogen in its monoatomic state consists of individual hydrogen atoms. In other words, there are no molecules or compounds involved, and each mole of hydrogen corresponds to Avogadro's number of hydrogen atoms.

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A molecular formula is a chemical formula for a molecular compound that shows the types and numbers of atoms in the compound's molecule. Ammonia is a nitrogen-hydrogen compound.

The total number of shared electrons in a molecule is 22.

Ionic and covalent compounds are the two types of compounds. Molecules are the most basic unit of a covalent compound, and they can be represented in a variety of ways.

Atoms are the smallest units of matter that retain an element's fundamental chemical properties. However, much of the study of chemistry is concerned with what happens when atoms combine to form compounds. A compound is a unique collection of atoms held together by chemical bonds.

The electrostatic attraction between the positively charged nucleus and the negatively charged electrons surrounding it holds the structure of the atom together, and the stability within chemical bonds is also due to electrostatic attractions. Consider the two most common types of chemical bonds: covalent bonds and ionic bonds. Two atoms share pairs of electrons in covalent bonds, whereas electrons are fully transferred between two atoms in ionic bonds.

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The statement which is not correct is the correct option is 1 mole of Cl₂ has 35.45 g of Cl.

The number of the moles is expressed as :

The number of moles = mass / molar mass

Where,

The moles of the chlorine molecule = 1 mole

The molar mass of the Cl = 35.45 g/mol

The molar mass of the Cl₂ = 2 × 35.45

The molar mass of the Cl₂ = 71 g

The mass of the chlorine = moles × molar mass

The mass of the chlorine = 1 mol × 71 g/mol

The mass of the chlorine = 71 g

Thus the grams of the chlorine molecule present in the 1 mole of the chlorine molecule is 71 g.

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Answer:

d) Hypothesis

Explanation:

I think d) Hypothesis is the correct answer for the question.

Hope it helps :)

The controls in this set-up would be the position of the lens in relation to the light beam and the distance of the lens from the screen because Lidia intends to measure the location where the light beam is focused. This is so that only the thickness of the lens needs to be changed, not the position.

The controls in Lidia’s investigation:

1) The thickness of the lens is the independent variable because the investigation's goal is to ascertain how one variable influences another.

In order to determine the effect on the dependent variable afterward, Lidia must experiment with a variety of thicknesses.

2) Because the goal of the investigation is to ascertain how a light beam is focused, this point is the dependent variable. As a result, she has no control over this point and will instead only monitor and measure how it responds to changes in the independent variable.

Lidia must confirm that no other factors are influencing the outcomes or output before drawing a decision.

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Spectral lines act like fingerprints that identify atoms and molecules.

Spectral lines are unique patterns of light emitted or absorbed by an atom or molecule at specific wavelengths or frequencies. These patterns are caused by the transitions of electrons within an atom or molecule, and are specific to each element or compound.

There are different types of spectroscopy used to study spectral lines, each one specific to a range of frequencies:

-In the visible region of the electromagnetic spectrum, we have the absorption or emission spectra.

-In the infrared region of the electromagnetic spectrum, we have the infrared spectra.

-In the ultraviolet and visible region of the electromagnetic spectrum, we have the ultraviolet-visible spectra.

-In the X-ray region of the electromagnetic spectrum, we have the X-ray spectra.

Each type of spectroscopy provides a unique set of information about the sample being studied, and can be used to identify and quantify specific elements or compounds.

Spectral lines are extremely specific and unique, like fingerprints, and can be used to identify and distinguish one atom or molecule from another.

The equilibrium constant (Kc) is 1.37 * 10² M⁻¹.

First, we write the reaction equation:

Fe³⁺ + SCN⁻ ↔ [FeSCN]²⁺

From this, we can see that the iron(III) cation (Fe³⁺) and the thiocyanate anion (SCN⁻) are the reactants, while the iron(III) thiocyanate ion ([FeSCN]²⁺) is the product. Based on this, we can write the expression for the equilibrium constant (Kc):

\(Kc = \frac{[[FeSCN]^{2+}]}{[Fe^{3+} ][SCN^{-} ] }\)

[Fe³⁺] - equilibrium concentration of the iron(III) ion (1.32 * 10⁻³M)

[SCN⁻] - equilibrium concentration of the thiocyanate ion (1.02 * 10⁻³ M)

[[FeSCN]²⁺] - equilibrium concentration of the iron(III) thiocyanate ion (1.84 * 10⁻⁴ M)

Now we plug the known values into the expression:

Kc = 1.84 * 10⁻⁴ M / (1.32 * 10⁻³ M * 1.02 * 10⁻³M)

Kc = 1.37 * 10² M⁻¹

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Arrhenius: an acid is a substance which when dissolved in water will release H⁺ ions.

HₓY(aq) ⇒ xH⁺(aq) + Yˣ-(aq)

Answer:

Tryptophan is an essential amino acid that can be found in the genetic code of humans

Answer:

Electroplating is the process that uses electric current to reduce dissolved metal ions by the use of electrolysis, to obtain the dissolved metal ions at the other electrode, mostly in the format of a uniform coating.

Answer:

Inference

Explanation:

A conclusion reached on the basis of evidence and reasoning is called an inference.

Aqueous Solution - The expected precipitate would consist of Cu(OH)2.

What is aqueous solution?

An aqueous solution is one in which water serves as the solvent. Chemical equations typically illustrate it by adding (aq) to the appropriate chemical formula. For instance, Na+(aq) + Cl would be used to represent a solution of table salt, as well as sodium chloride (NaCl), throughout water (aq). The word aqueous, which derives from the word aqua, means that it is dissolved in or related to water. Water is a common solvent in chemistry due to its superior solvent properties and natural abundance. Since water is frequently used as a solvent in experiments, unless the solvent is specified, the word "solution" refers to an aqueous solution. A solution wherein the solvent is a liquid but not water is referred to as a non-aqueous solution.

Because:

salt:    copper(II) hydroxide
Ksp:    1.8 × 10-19

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Answer:

Mass of CsXeF₇  = 99.3 g

Explanation:

Given data:

Mass of CsF = 37.8 g

Mass of CsXeF₇ produced = ?

Solution:

Balance chemical equation:

CsF + XeF₆   →    CsXeF₇

Number of moles of CsF:

Number of moles = mass/molar mass

Number of moles = 37.8 g/ 152 g/mol

Number of moles = 0.25 mol

Now we will compare the moles of CsF with CsXeF₇  from balance chemical equation:      

                   CsF             :         CsXeF₇

                    1                 :             1

                 0.25             :           0.25

Mass of CsXeF₇ :

Mass = number of moles × molar mass

Number of moles = 0.25 mol × 397.2 g/mol

Mass = 99.3 g

Answer:

98.84

Explanation: