calculation and give the answers to the correct number of significant figures.
Part A
1.72×10−3/7.9×1021.72×10−3/7.9×102
Express your answer to the correct number of significant figures.
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Part B
1.98×10−2+1×10−4−3.5×10−31.98×10−2+1×10−4−3.5×10−3
Express your answer to the correct number of significant figures.
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Part C
[(1.38×105)(0.000318)/0.080](115.2)[(1.38×105)(0.000318)/0.080](115.2)
Express your answer to the correct number of significant figures.

Answer:

I guess the 1st one idk

Answer:

H

He

Li

Be

B

C

N

O

F

Ne

Na

Mg

Al

Si

P

S

Cl

Ar

K

Ca

Answer:

because your parents carry the recessice gene or they are blond

Explanation:

it could also be ffrom a mutation or just because you dyed your hair

The hydration of isobutylene to give an alcohol can be accomplished in dilute aqueous acid through a reverse mechanism of alcohol dehydration.

Here's a step-by-step explanation of how the hydration reaction occurs:

1. Start with isobutylene (CH3CH=CHCH3).

2. The hydration reaction takes place in the presence of a dilute aqueous acid, such as sulfuric acid (H2SO4). The acid acts as a catalyst in the reaction.

3. In the first step of the reaction, the alkene (isobutylene) reacts with the acid to form a carbocation intermediate. The double bond between the carbon atoms in isobutylene is broken, and one of the carbon atoms forms a bond with a proton (H+) from the acid. The other H+ from the acid forms a bond with a water molecule, creating a hydronium ion (H3O+).

4. The resulting carbocation intermediate has a positive charge on one of the carbon atoms. In the caseof isobutylene, the carbocation will be a tertiary carbocation due to the more stable nature of the tertiary carbocations compared to primary or secondary carbocations.

5. In the second step, a water molecule from the solution attacks the positively charged carbon in the carbocation intermediate. This forms a bond between the carbon and oxygen atoms, adding the OH group to the carbon.

6. Finally, a deprotonation step occurs, where another water molecule removes a proton (H+) from the oxygen atom that had formed a bond with the carbon. This forms an alcohol molecule and regenerates the hydronium ion (H3O+), completing the hydration reaction.

In conclusion, the hydration of isobutylene to form an alcohol occurs through a mechanism that involves the formation of a carbocation intermediate and the subsequent addition of a water molecule to the carbon. This process is the reverse of the alcohol dehydration mechanism and occurs in the presence of a dilute aqueous acid, such as sulfuric acid.

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0.78 m³ is the volume of the same sample at standard temperature and pressure(stp) will be closest to the volume at 350 k and 1 atm.

The ideal gas law (PV = nRT) explains how the macroscopic properties of ideal gases are connected. The particles in an ideal gas are those that: (a) do not interact with one another; and (b) take up no space (have no volume). The ideal gas law does provide a good approximation of real gas behavior in many circumstances, but no gas is truly ideal.

PV = (nRT)

Where;

P₁ = initial pressure = 1 atm

V₁ = initial volume = 1 m³

T₁ = initial temperature = 350 k

P₂ = final pressure = 1 atm

V₂ = final volume = ?

T₂ = final temperature = 273 k

P₁V₁ / T₁ = P₂V₂ / T₂

Solving for V₂;

V₂ = P₁V₁T₂ / P₂T₁

V₂ = 1 × 1 × 273/350

V₂ = 273/350 m³

V₂ = 0.78 m³

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Synthesis reaction

It is a reaction in which 2 or more reactants combine with each other to form one product .

Check option C

Sulphate and water are combining to form sulfuric acid .

Hence option C is correct

Answer:

SO3 + H2O => H2SO4

Explanation:

I took the test :)

Answer:

NaCl= ionic bond.

H2O=covalent bond.

Explanation:

NaCl:

Happens between metal and non-metal. since metal needs to lose an electron to get a full outer shell of electrons, sodium (Na) loses one electron and has a full outer shell of electrons.

chlorine is a gas so it needs to gain electrons to have a full outer shell. since it is in group 7, it needs to gain 1 electron for a full outer shell of electrons.

the lost electron from sodium is given to chlorine. this creates ions (a charged particle) so it is Na+Cl-. this creates a strong electrostatic attraction between the elements and causes them to join together in a lattice form.

H2O:

Covalent bonds happens between 2 gases. they share an electron or 2, and the bonds are very strong.

since oxygen needs 2 molecules to form a full outer shell. hydrogen have 1 atom in outer shell so they share the electron with the oxygen atom.

I can't fully explain why this is for H2O, but I hope you understand it.

When solid surfaces slide over each other, the kind of friction that occurs is called Sliding Friction.

Balancing equations in grade 9 natural science involves ensuring that the number of atoms of each element is equal on both sides of the chemical equation. Here's a step-by-step process to balance equations:

Start by writing down the unbalanced equation, including the formulas of all reactants and products.

Count the number of atoms for each element on both sides of the equation.

Begin by balancing elements that appear in only one compound on each side. Adjust the coefficients (numbers in front of the formulas) to balance the number of atoms.

Next, balance elements that appear in multiple compounds. Remember that coefficients apply to the entire compound. Avoid changing subscripts, as they represent different substances.

Keep adjusting the coefficients until the number of atoms is the same on both sides.

Check your work by counting the atoms again to ensure they are balanced.

Remember, balancing equations requires practice. Be patient and persistent. It's helpful to start with simpler equations and gradually work your way up to more complex ones. Balancing equations is an essential skill in chemistry as it demonstrates the law of conservation of mass and allows for accurate predictions of chemical reactions.

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If the p-value is greater than or equal to the significance level (α = 0.01), do not reject the null hypothesis.

To test the hypotheses using the χ2 goodness of fit test, we will perform the following steps:

(a) P-value approach:

State the null hypothesis (H0): The population proportions are pA = 0.40, pB = 0.40, and pC = 0.20.

State the alternative hypothesis (Ha): The population proportions are not pA = 0.40, pB = 0.40, and pC = 0.20.

Calculate the expected frequencies for each category. Multiply the sample size (n = 200) by the respective population proportion for each category:

Expected frequency for category A = 200 * 0.40 = 80

Expected frequency for category B = 200 * 0.40 = 80

Expected frequency for category C = 200 * 0.20 = 40

Calculate the test statistic (χ2) using the formula:

χ2 = Σ [(Observed frequency - Expected frequency)2 / Expected frequency]

χ2 = [(80 - 80)2 / 80] + [(20 - 80)2 / 80] + [(100 - 40)2 / 40]

χ2 = (0 + 100 + 150) / 80

χ2 = 2.875

Determine the degrees of freedom (df). In this case, df = number of categories - 1 = 3 - 1 = 2.

. The p-value is the probability of observing a test statistic as extreme as the one calculated, assuming the null hypothesis is true.

State your conclusion based on the p-value:

If the p-value is less than the significance level (α = 0.01), reject the null hypothesis.

If the p-value is greater than or equal to the significance level (α = 0.01), do not reject the null hypothesis.

(b) Critical value approach:

State the null hypothesis (H0) and alternative hypothesis (Ha) as mentioned above.

Calculate the test statistic (χ2) using the formula as mentioned above. In this case, χ2 = 2.875.

Determine the critical values for the rejection rule using the degrees of freedom (df = 2) and the significance level (α = 0.01). The critical values can be found from the χ2 distribution table.

Lower critical value: χ2 < (value from the table at α/2 with df = 2)

Upper critical value: χ2 > (value from the table at 1 - α/2 with df = 2)

Compare the calculated test statistic with the critical values:

If the test statistic is less than the lower critical value or greater than the upper critical value, reject the null hypothesis.

If the test statistic falls between the critical values, do not reject the null hypothesis.

State your conclusion based on the rejection rule.

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At the same temperature, the value of the equilibrium constant, k, for the reverse reaction is 5.0 x 10^-6.

Given the reaction: 2NOCl(g)⇌2NO(g)+Cl2(g) At a certain temperature, the value of the equilibrium constant, k, for the reaction is 2.0 x 10^5. This means that the reaction favors the forward reaction at the given temperature. Now, let's find the value of the equilibrium constant for the reverse reaction.

The equilibrium constant expression for the reverse reaction can be written as follows: NO(g)+Cl2(g)⇌2NOCl(g). The equilibrium constant expression for the reverse reaction is the reciprocal of the equilibrium constant expression for the forward reaction. krev=1/k=1/2.0 x 10^5=5.0 x 10^-6. Therefore, the value of the equilibrium constant, k, for the reverse reaction at the same temperature is 5.0 x 10^-6.

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Answer:

true

Explanation:

The command that allows moving a file from one location to another is the "mv command".

The mv command renames or transfers files and folders from one directory to another. A file or directory keeps its base file name when moved to a new directory. All links to other files are preserved when you transfer a file, with the exception of when you move it to a different file system. A directory and its contents are added beneath the existing directory when you transfer a directory into it.

The TargetDirectory option of the mv command allows you to provide a new file name or a new directory path name when renaming a file or directory.

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187.1 g/mol

Hope that helps!

The empirical formula with whole number subscripts is \(C_3H_3O_1\). Therefore, we need to multiply the subscripts by 1  to get the empirical formula in whole numbers. Option B is correct .

To determine the whole number subscripts of the empirical formula, we need to find the smallest set of integers that can be multiplied to the subscripts to get whole numbers. To do this, we can divide each subscript by the smallest subscript and round to the nearest whole number.

In this case, the smallest subscript is 1, so we can divide each subscript by 1:

C 2.67 ÷ 1 = 2.67 ≈ 3

H 3 ÷ 1 = 3

O 1 ÷ 1 = 1

So, the empirical formula with whole number subscripts is  \(C_3H_3O_1\). Therefore, we need to multiply the subscripts by 1 (option B) to get the empirical formula in whole numbers.

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Answer:

bbecause it make the answer

a)We need 2.25 mL of 4.0 M Sucrose solution and 7.75 mL of water to make 10 mL of a 0.9 M Sucrose solution.

b)We need 1 mL of 4.0 M Sucrose solution and 9 mL of water to make 10 mL of a 0.4 M Sucrose solution.

a)To make 10 mL of a 0.9 M Sucrose solution, we need to calculate the amount of 4.0 M Sucrose solution and water required:

Let's call the volume of 4.0 M Sucrose solution used in the solution "x".

Since the concentration of the final solution is 0.9 M, the number of moles of sucrose in the final solution is:

\(0.9 M * 10 = 9 * 10^-3\) moles

Since the initial concentration of the sucrose solution is 4.0 M, the number of moles of sucrose in the initial solution is:

\(4.0 M * 1 = 4x * 10^-^3\) moles.

Since the number of moles of sucrose must remain constant, we can equate the two:

\(9 * 10^-^3 = 4x * 10^-^3\)

x = 2.25 mL

b)Let's call the volume of 4.0 M Sucrose solution used in the solution "y".

Since the concentration of the final solution is 0.4 M, the number of moles of sucrose in the final solution is:

\(0.4 M * 10 = 4 x 10^-^3\)

Since the initial concentration of the sucrose solution is 4.0 M, the number of moles of sucrose in the initial solution is:

\(4.0 M * y = 4y * 10^-^3\)

Since the number of moles of sucrose must remain constant, we can equate the two:

\(4 * 10^-^3 = 4y * 10^-^3\)

y = 1 mL

What is the C1V1 C2V2 formula?

Proportional sets. C1V1=C2V2 is used to calculate an unknown quantity where two solutions/mixtures are proportional

C1V1 = Concentration/amount (start) and Volume (start) C2V2 = Concentration/amount (final) and Volume (final)

What is the dilution formula called?

This process is known as dilution. We can relate the concentrations and volumes before and after a dilution using the following equation: M₁V₁ = M₂V₂ where M₁ and V₁ represent the molarity and volume of the initial concentrated solution and M₂ and V₂ represent the molarity and volume of the final diluted solution.

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Answer:

(d) All of the above

Explanation:

Acidic:-

Glutamic Acid

Basic:-

Lysine

Polar:-

Histidine

NonPolar:-

Leucine

The side chain of amino acids may contain

d) all of the above

Amino acids are the building blocks of proteins.

Amino acids are the building blocks of proteins and play an important role in body functions. They are needed for vital processes like cell building and synthesis of hormones and neurotransmitters (brain chemicals). They may also be taken as supplements.

They contain acidic and basic groups, polar and non-polar groups as well.

Examples are Alanine, Arginine, Asparagine, etc.

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Answer:

a. friction

Explanation:

What is a common unbalanced force acting in motion? Common forces that are often unbalanced include the force of gravity and applied forces. When these forces are unbalanced, objects accelerate, change their position and find new configurations for which all forces are again balanced.

Friction is a kind of force.

Prolyl hydroxylase cannot effectively utilize copper as a substitute for iron in its redox active center. The specific chemical properties of iron make it crucial for the enzyme's function.

Prolyl hydroxylase is an enzyme that plays a critical role in the post-translational modification of proteins. It contains an iron (Fe) redox active center, which is essential for its catalytic activity. Iron is a transition metal with specific chemical properties that allow it to participate in redox reactions, making it an ideal cofactor for this enzyme.

Copper (Cu), although also a transition metal, has different chemical properties that make it less suitable for this specific role. The redox potentials of copper and iron are different, meaning that copper would not provide the same catalytic efficiency as iron in prolyl hydroxylase's active site. Additionally, the coordination geometry and ligand preferences of copper differ from those of iron, which may lead to altered enzyme structure and function.

In summary, although copper is a transition metal like iron, its distinct chemical properties make it an unsuitable substitute for iron in the redox active center of prolyl hydroxylase.

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HOMOGENEOUS

✔️ 1. flat soda pop

✔️ 2. cherry vanilla ice cream

✔️ 3. salad dressing

✔️ 4. sugar

HETEROGENEOUS

5. soil

aluminum foil

black coffee

Homogeneous substances and mixtures are uniform in composition and have the same properties throughout. Heterogeneous substances and mixtures are not uniform in composition and can have different properties in different parts.

Flat soda pop is a homogeneous mixture because it is a uniform mixture of water, carbon dioxide gas, and various flavors and sweeteners.

Cherry vanilla ice cream is a homogeneous mixture because it is a uniform mixture of milk, cream, sugar, cherries, and vanilla flavor.

Salad dressing is a homogeneous mixture because it is a uniform mixture of oil, vinegar, and various flavors and seasonings.

Sugar is a homogeneous substance because it is a pure substance made up of molecules with the same chemical formula.

Soil is a heterogeneous mixture because it is made up of a combination of minerals, organic matter, water, and air, which can vary in composition and properties in different parts of the mixture.

Aluminum foil is a heterogeneous mixture because it is made up of thin sheets of aluminum metal mixed with other substances, such as coatings or additives, which can vary in composition and properties in different parts of the mixture.

Black coffee is a homogeneous mixture because it is a uniform mixture of water, coffee beans, and various flavors and aromas.

The classification of the substances and mixtures as either homogeneous or heterogeneous:

HOMOGENEOUS:

Flat soda pop: ✔️

Salad dressing: ✔️

Sugar: ✔️

Black coffee: ✔️

HETEROGENEOUS:

Cherry vanilla ice cream: ✔️

Soil: ✔️

Aluminum foil: ✔️

Any material or combination that is homogeneous throughout and difficult to discern with the eye is referred to as homogeneous matter. Due to their similar composition, flat soda pop, salad dressing, sugar, and black coffee are categorized as homogenous in this example.

Contrarily, heterogeneous matter describes substances or mixes that are visibly distinct and have an uneven or non-uniform composition. Aluminum foil, cherry vanilla ice cream, and dirt are all examples of heterogeneous materials since they all have distinct visible components or phases.

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The mass of NaHCO₃ needed to produce 2.659 moles of CO₂ is 446.712 g

We'll begin by writing the balanced equation for the reaction. This can be obtained as follow:

2NaHCO₃ —> Na₂CO₃ + CO₂ + H₂O

Molar mass of NaHCO₃ = 23 + 1 + 12 + (16×3)

= 84 g/mol

Mass of NaHCO₃ from the balanced equation = 2 × 84 = 168 g

From the balanced equation above,

168 g of NaHCO₃ decomposed to produce 1 mole of CO₂.

With the above information, we can obtain the mass of NaHCO₃ needed to produce 2.659 moles of CO₂. This can be obtained as follow:

From the balanced equation above,

168 g of NaHCO₃ decomposed to produce 1 mole of CO₂.

Therefore,

Xg of NaHCO₃ will decompose to produce 2.659 moles of CO₂ i.e

Xg of NaHCO₃ = 168 × 2.659

Xg of NaHCO₃ = 446.712 g

Thus, 446.712 g of NaHCO₃ is needed to produce 2.659 moles of CO₂.

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According to the research, the correct option is metal zinc. Hydrogen can be produced by reaction of cold water with metal zinc.

It is an abundant metal in the earth's crust, white and shiny, which can appear in the form of silicate, sulfide or carbonate.

This metal can be reused for the production of biofuel such as hydrogen whose hydrogen production is generated from different methods based on fuel processing and non-reforming technologies and from chemical reactions that consists of adding cold water to a metal.

Therefore, we can conclude that according to the research, the correct option is metal zinc. Hydrogen can be produced by reaction of cold water with metal zinc.

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A mineral contains 675 parent atoms and 225 daughter atoms and the half-life for the radioactive element is 40 million years, the age of the rock is: approximately 46.8 million years

The half-life of the radioactive substance is 40 million years. The number of parent atoms is 675 and the number of daughter atoms is 225. To calculate the age of the rock, we must first calculate the number of half-lives. The number of daughter atoms increases as time passes, while the number of parent atoms decreases.

After each half-life, the number of parent atoms decreases by 50%, and the number of daughter atoms increases by 50%. For example, after one half-life, 337.5 parent atoms remain, and 562.5 daughter atoms have been produced. The rock's age can be determined by determining how many half-lives have elapsed. In order to calculate the number of half-lives, the following equation is used:

The number of parent atoms remaining = the original number of parent atoms × (1/2)number of half-lives
Since the initial number of parent atoms is 675, we have:
\(225 = 675 × (1/2)number of half-lives\)

Solving for the number of half-lives, we get:
\(number of half-lives = log(225/675) ÷ log(1/2) ≈ 1.17\)

Since one half-life is 40 million years, the age of the rock is:
Age = number of half-lives × half-life
Age = 1.17 × 40 million years = 46.8 million years

Therefore, the age of the rock is approximately 46.8 million years.

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Reactivity decreases as you move from left to right. The farther to the left and down the periodic chart you move, easier it is for electrons to be given or taken away, hence resulting in higher reactivity.

Reactivity decreases as we move down the column. As you learn more about the table, you will be able to find that this pattern is true for other families.

The atoms get bigger, as the atomic number increases. The chemical properties change slightly when compared to the element right above them on the table. The non-metal elements in Group 7 that are known as the halogens, get less reactive as you move to the down of the group.

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The Calvin cycle's reactions are not dependent on light.  CO2 reduction is the process through which carbon dioxide is fixed and ultimately converted to glucose.

The process that lowers CO2 is crucial to the Calvin cycle. In the crucial procedure known as carbon fixation, CO2 binds to RuBP to produce two to three carbon reduction molecules of phosphoglycerate. The Calvin Cycle's internal workings. Carbon dioxide (CO2) diffuses into the stroma of the chloroplast, the location of the Calvin cycle processes where sugar is generated, when it reaches the chloroplast of plants.

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Answer:

3.2-2.5 = 0.7 pretty small difference

Explanation:

im his bruda

Electronegativity tends to increase across a period. This is because as you move from left to right across a period, the number of protons in the nucleus increases, while the number of electrons stays the same.  Hence option C is correct.

This means that the effective nuclear charge, which is the net positive charge experienced by the valence electrons, increases. The increase in effective nuclear charge makes it more difficult for the valence electrons to be pulled away from the nucleus, which increases the electronegativity.

Electronegativity tends to decrease down a group. This is because as you move down a group, the number of electrons in the valence shell increases. This increases the shielding effect, which is the effect of the inner electrons in reducing the attractive force of the nucleus on the valence electrons.

The decrease in the attractive force of the nucleus makes it easier for the valence electrons to be pulled away, which decreases the electronegativity.

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