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Answer 1

Answer:

fjnjfzgnf

Explanation:

Answer 2

Answer:

it blank !

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Related Questions

15) The average human is ~60% water, which translates to ~44.3 kg of water. If you eat a Reece's peanut butter cup (105 Calories or 4.39 x 105J), how many degrees Celsius (°C) should the 44.3kg of water rise. The specific heat of water is 4.184 J/g.°C. A) 2.37 x 103°C B) 5.66 x 104°C C) 41.5°C D) 2.37°C E) 0.566°C 4.39x1055 0.043 y 4.18488.0

Answers

Answer: D) 2.37°C

Explanation:

[tex]4.39x10^5J(\frac{g°C}{4.184J} )(\frac{kg}{1000g})(\frac{1}{44.3kg} )[/tex] [tex]=2.37°C[/tex]

A buffer is prepared by adding 150mL of 0.50 M NH3 to 250mL of 0.50 M NH4NO3. What is the pH of the final solution? (Kb for NH3 = 1.8 x 10^-5)

Answers

From the calculations, the pH of the final solution is 9.04.

What is the pH of the buffer?

We can use the Henderson Hasselbach equation to obtain the final pH of the solution in terms of the pKb and the base concentration.

Number of moles of salt = 250/1000 L * 0.5 M = 0.125 moles

Number of moles of base = 150/1000 L * 0.5 M = 0.075 moles

Total volume of solution = 250ml + 150ml = 400ml or 0.4 L

Molarity of base = 0.075 moles/ 0.4 L = 0.1875 M

Molarity of salt = 0.125 moles/ 0.4 L = 0.3125 M

pOH = pKb + log[salt/base]

pKb = -log(1.8 x 10^-5) = 4.74

pOH = 4.74 + log[0.3125/0.1875 ]

pOH = 4.96

pH = 14- 4.96

pH = 9.04

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(A) O ( B) La (C) Rb (D) Mg (E) N
1. What is the most electronegative element of the above?
2. Which element exhibits the greatest number of different oxidation states?
3. Which of the elements above has the smallest ionic radius for its most commonly found ion?

Answers

1. The most electronegative element is O (a)

2. The element that exhibits Greatest number of oxidation states is N (e)

3. The Smallest ionic radius for its most common ion is found for Mg (d)

1. Electronegativity is tendency of an atom to attract shared pair of electrons. Across a period, it increases from left to right while in a group, it decreases as we move down. The most electronegative elements are found in the top right of the periodic table because of the increase in effective nuclear charges. Hence, O is most electronegative element.

2. Oxidation state is the total number of electrons that an atom can either gain or loss to form a chemical bond. N exhibits a wide range of oxidation states from -3 to +5 because of half filled p orbital which is more stable.

3. Ionic radius is the radius of a monatomic ion in an ionic crystal structure. [tex]Mg^{2+}[/tex] has higher number of protons that will attract the negatively charged valence electrons to a greater extent hence shortening the distance.

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Determine the empirical formula of a compound containing 40.6 grams of carbon, 5.1 grams of hydrogen, and 54.2 grams of oxygen.
In an experiment, the molar mass of the compound was determined to be 118.084 g/mol. What is the molecular formula of the compound?
For both questions, show your work or explain how you determined the formulas by giving specific values used in calculations.

Answers

The Empirical formula of compound is C₁H₂O₁. The Molecular Formula of the compound is 4 (C₁H₂O₁).

What is Empirical Formula ?

Empirical formula is the simplest whole number ratio of atoms present in given compound.

Element % Atomic mass Relative no. of atoms Simplest whole ratio

C 40.6 12 [tex]\frac{40.6}{12}[/tex] = 3.3 [tex]\frac{3.3}{3.3} = 1[/tex]

H 5.1 1 [tex]\frac{5.1}{1}[/tex] = 5.1 [tex]\frac{5.1}{3.1} = 2[/tex]

O 54.2 16 [tex]\frac{54.2}{16}[/tex] = 3.3 [tex]\frac{3.3}{3.3} = 1[/tex]

The Empirical formula of compound is C₁H₂O₁ or CH₂O

How to find the Molecular formula of compound ?

Molecular formula = Empirical formula × n

[tex]n = \frac{\text{Molecular weight}}{\text{Empirical Formula weight}}[/tex]

[tex]= \frac{118.084}{30}[/tex]

= 4

Molecular formula = n × Empirical formula

= 4 (C₁H₂O₁)

Thus from the above conclusion we can say that The Empirical formula of compound is C₁H₂O₁. The Molecular Formula of the compound is 4 (C₁H₂O₁).

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What is the mole fraction of sulfuric acid in a solution made by adding 34 g of sulfuric acid (H2SO4 = 98 g/mol) to 100 g of water (H2O = 18 g/mol)?

Answers

Answer:

Mole Fraction = 0.059

Explanation:

To find the mole fraction, you need to (1) convert grams H₂SO₄ and H₂O to moles (via molar mass) and then (2) calculate the mole fraction.

(Step 1)

Molar Mass (H₂SO₄): 98 g/mol

34 grams H₂SO₄ 1 mole
-------------------------- x ------------------- = 0.347 moles H₂SO₄
98 grams

Molar Mass (H₂O): 18 g/mol

100 grams H₂O 1 mole
------------------------- x -------------------- = 5.56 moles H₂O
18 grams

(Step 2)

moles solute
Mole Fraction = -------------------------------------------------
moles solute + moles solvent

0.347 moles H₂SO₄
Mole Fraction = -----------------------------------------------------------
0.347 moles H₂SO₄ + 5.56 moles H₂O

Mole Fraction = 0.059

Which sample contains the largest number of oxygen atoms? Select one: a. 8.0 g of carbon dioxide b. 8.0 g of potassium chlorate c. 8.0 g of calcium perchlorate d. 8.0 g of sodium hydroxide

Answers

The sample with the largest number of oxygen atoms will be calcium perchlorate.

Number of atoms in a compound

Since we are not looking at the number of moles, the mass of the compounds has no bearing on the number of atoms of oxygen.

The chemical formula for carbon dioxide is [tex]CO_2[/tex]. Thus, it has 2 atoms of oxygen.The chemical formula for potassium chlorate is [tex]KClO_3[/tex]. Thus, it has 3 oxygen atoms.The chemical formula for calcium perchlorate is [tex]Ca(ClO_4)_2[/tex]. Thus, it has 8 atoms of oxygen.The chemical formula for sodium hydroxide is NaOH. Thus, it has 1 atom of oxygen.

Therefore, the compound with the largest number of oxygen atoms is calcium perchlorate.

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Copper metal has a face-centered cubic structure with all atoms at lattice points and a density of 8.93 g/cm^3. The edge length of the unit cell is 361.5 pm. Calculate the mass of 1 atom of copper.

Answers

The mass of 1 atom of copper metal in the given face-centered cubic structure is determined as 1.054 x 10⁻²² g.

Mass of 1 atom of copper

The mass of 1 atom of copper is calculated as follows;

mass of 1 atom of copper = molar mass of copper / Avogadro's number

substitute the value of molar mass of copper and Avogadro's number;

mass of 1 atom of copper = (63.5 g/mol) / (6.023 x 10²³)

mass of 1 atom of copper = 1.054 x 10⁻²² g

Thus, the mass of 1 atom of copper is determined as 1.054 x 10⁻²² g.

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A student measures the length of an object to be 152 cm. What is the measurement in km?

Answers

Answer: 0.00152 km

Explanation:

A glass container was initially charged with
3.00 moles of a gas sample at 3.75 atm and
21.7 °C. Some of the gas was released as the
temperature was increased to 28.1 °C, so the
final pressure in the container was reduced to
0.998 atm. How many moles of the gas
sample are present at the end?
Answer in mol

Answers

The number of moles of the gas sample present at the end is 0.78 moles.

Number of moles of the gas

PV = nRT

V = nRT/P

At a constant volume, V;

n₁RT₁/P₁ = n₂RT₂/P₂

n₁T₁/P₁ = n₂T₂/P₂

n₂ = (n₁T₁P₂)/(P₁T₂)

where;

T₁ is initial temperature = 21.7⁰C = 294.7 KT₂ is final temperature = 28.1⁰C = 301.1 K

n₂ = (3 x 294.7 x 0.998)/(3.75 x 301.1)

n₂ = 0.78 moles

Thus, the number of moles of the gas sample present at the end is 0.78 moles.

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Research the ecology of your region and find one species that is endangered. Find an estimate of the population of the species in your region. Describe the threats facing that species, especially threats posed by human activities.

Answers

The endangered species in my region with their estimate population are:

Northwestern African Cheetah - 250 West African Lion - 400

What threat faces Northwestern African Cheetah?

This cheetah is said to be an endangered species because of their loss of their habitat and also due to fragmentation, trade and little human-activities.

West African Lion is said to be an endangered species because the lion's historic range in West Africa was said to be lowered by a lot of amount or scale as a result of land use changes and human activities such as falling of trees, buildings, etc.

Hence the endangered species in my region with their estimate population are:

Northwestern African Cheetah - 250 West African Lion - 400

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What is the numerical value for Q for this reaction? Remember to always express your answer to correct number of significant figures.

Answers

The reaction is not at equilibrium because Q >P hence the reaction moves towards the left hand side.

What is the equilibrium constant?

The equilibrium constant is a figure that tells us the extent to which the reactants have been converted to products in a reaction.

Now we have the reaction; PCl3(g) + Cl2(g) ⇄ PCl5(g) hence we can write;

Q = [PCl5]/[PCl3] [Cl2]

Q = 0.39/0.21 * 0.41

Q = 4.5

The reaction is not at equilibrium because Q >P hence the reaction moves towards the left hand side.

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Positive ions usually form from ____
and are called cations.
Metals
Noble gases
Nonmetals

Answers

Answer:

Metals

Explanation:

Positive ions are formed when atoms give up some valence electrons in order to have a full octet. The atoms most likely to do this have a small number of valence electrons. Most to these atoms are generally in the s-block (left side) of the periodic table. These elements are metals.

*nonmetals are located in the p-block (right side) and noble gases are located in the 18th column (far right column)

Calculate the pOH for the following:
1. [H+] = 1 x 10-12 M

2. [OH-] = 1 x 10-6 M

3. [H+] = 1 x 10-1 M

4. [H+] = 1 x 10-4 M

5. [OH-] = 1 x 10-7 M

Answers

The pOH refers to the negative logarithm of the hydroxide concentration.

What is the pOH?

The term pOH refers to the negative logarithm of the hydroxide concentration. Now we know that there is a relation that states that;

[H+] [OH-] = 1 * 10^-14

We shall now apply this relation in each case as follows;

[OH-] = 1 * 10^-14/1 x 10-12

[OH-] = 1 * 10^-2

pOH = 2

2. pOH = -log( 1 x 10-6 M) = 6

3. [OH-] = 1 * 10^-14/ 1 x 10-1

[OH-] = 1 * 10^-13

pOH = 13

4. [OH-] = 1 * 10^-14/ 1 x 10-4

[OH-] = 1 * 10^-10

pOH = 10

5. pOH = -log( 1 x 10-7) = 7

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In a calorimetry experiment 2.50 g of methane is burnt in excess oxygen. 30% of the energy released during the combustion is absorbed by 500 g of water, the temperature of which rises from 25°C to 68°C. The specific heat capacity of water is 4.184 J/g°C. What is the total energy released per gram of methane burnt?

Answers

The total energy released per gram of methane burnt is 119,941.3 J/g.

Energy absorbed by water

Q = mcΔθ

where;

m is mass of waterc is specific heat of waterΔθ is change in temperature

Q = (500)(4.184)(68 - 25)

Q = 89,956 J

Total energy released per gram of methane burnt

0.3T = 89,956 J

T = 89,956 J/0.3

T = 299,853.3 J

Total energy per gram of methane, E = T.E/m

E = (299,853.3 J) / (2.5 g)

E = 119,941.3 J/g

Thus, the total energy released per gram of methane burnt is 119,941.3 J/g.

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In Part A, we saw that the theoretical yield of aluminum oxide is 0.700 mol . Calculate the percent yield if the actual yield of aluminum oxide is 0.532 mol .

Answers

Considering the definition of percent yield, the percent yield is 76%.

Percent yield

The percent yield is the ratio of the actual return to the theoretical return expressed as a percentage.

The percent yield is calculated as the experimental yield divided by the theoretical yield multiplied by 100%:

[tex]percent yield=\frac{actual yield}{theorical yield}x100[/tex]

where the theoretical yield is the amount of product acquired through the complete conversion of all reagents in the final product, that is, it is the maximum amount of product that could be formed from the given amounts of reagents.

Percent yield in this case

In this case, you know:

actual yield= 0.532 molestheorical yield= 0.700 moles

Replacing in the definition of percent yield:

[tex]percent yield=\frac{0.532 moles}{0.700 moles}x100[/tex]

Solving:

percent yield= 76%

Finally, the percent yield is 76%.

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which gas law is not included in the combined gas law

Answers

Answer:

Watson law is not part of the combined gas law

Gas Laws

There are 5 basic gas laws of ideal gases:

Boyle's Law: volume (V) is inversely proportional to pressure (P)Charles' Law: V is proportional to temperature (T)Gay-Lussac's Law: P is proportional to TDalton's Law: The total pressure exerted by a mixture of ideal gases is equal to the sum of the pressures of the individual gasesAvogadro's Law: All equal volumes of ideal gases contain the same number of gas particles (at constant T and P); V is proportional to moles (n)

The Combined Gas Law

This law features Charles', Boyle's and Gay-Lussac's laws.

Therefore, Dalton's and Avogadro's laws are exluded.

the proper answer gets marked brainiest, answer what the question is asking.

What classifies a substance as an element?
What classifies a substance as a compound?

Actually, answer what the question is asking and give a short answer. No copying and pasting.

Answers

A substance is an element if it consists of a single type of atom. A substance is a compound if it is made up of more than one element.

Elements and compounds

In chemistry, an element is defined as all pure substances consisting of the same atom. For example, magnesium and potassium metal are all elements because they consist of magnesium and potassium atoms only.

On the other hand, compounds are defined as substances consisting of 2 or more atoms of different elements. For example, sodium chloride consists of atoms of sodium and chlorine. Hence, it is considered to be a compound.

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ALab Data
78°F
Verify your volume measurement
You have not titrated to the endpoint
Did you report your data to the correct number of
significant figures?
Standardized NaOH (M) 0.4171
Initial volume of buret (mL) 0.50
Volume of vinegar (mL) 10.00
Observations
solution increased.
Final volume of buret (mL)
Volume of NaOH (mL)
Molarity of acetic acid (M)

Answers

The correct number of significant figures are,

Final volume of burette is 38.86ml

Volume of NaOH is 38.36ml

Given data:

Initial volume of burette V(I)= 0.50ml

Molarity of NaOH is M1 = 0.4171M

Volume of Vinegar V2 = 10.00ml

Molarity of acetic acid M2= 1.6M

Final volume of burette V(f)= ?

volume of NaOH V1 = V(f) - V(I) = ?

Determining the moles of acetic acid (CH3COOH)

Molarity = moles of solute / volume of solution

Molarity of acetic acid = moles of CH3C00H / Volume of vinegar

1.6 = moles of CH3C00H / 10.00

moles of CH3C00H = 1.6 * 10.00

Moles of CH3COOH is 16.00mols

Determining the moles of Sodium Hydroxide (NaOH)

In a volumetric titration the amount of Standard solution (titrant) used in the titration is stoichiometrically equivalent to amount of unknown solution (analyte) used for the titration at the endpoint.

Hence,

Moles of NaOH = Moles of CH3COOH

Moles of NaOH is 16.00mols

Determining the volume of Sodium Hydroxide (NaOH)

Molarity of NaOH = moles of NaOH / Volume of NaOH

0.4171 = 16.00 / V(f)-V(I)

0.4171 = 16.00 / V(f)- 0.50

V(f) = ( 16 / 0.4171 ) + 0.50

V(f) = 38.86 ml

Final volume of NaOH V(f) is 38.86ml

Volume of NaOH V1 = 38.86 - 0.50

Volume of NaOH is 38.36ml

DISCLAIMER: Question is incomplete

Initial volume of burette = 0.50ml

Molarity of NaOH = 0.4171M

Volume of Vinegar = 10.00ml

Molarity of acetic acid = 1.6M

Final volume of burette = ?

volume of NaOH = ?

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The cell membrane is
a)semi permeable
b)selectively permeable

Answers

Answer:

A. Semi Permeable.

Explanation:

Cell membranes are semi permeable.

Volume is: A. Non of these. B. How much matter something contains.

Answers

B. How much matter something contains

Consider the balanced equation:

Mg2Si (s) + 2 H2O (l) ---> 2 Mg(OH)2 (aq) + SiH4 (g)

Calculate the grams of silane gas, SiH4, formed when 8.48 g of Mg2Si react with excess H2O.

2. Consider the balanced equation:

4 NH3 (g) + 7 O2 (g) ---> 4 NO2 (g) + 6 H2O (g)

What is the mass of H2O produced when 109.4 g of NH3 is completely reacted

Answers

1. The mass of silane gas, SiH₄ formed from the reaction is 3.57 g

2. The mass of H₂O produced from the reaction is 173.75 g

1. How to determine the mass of SiH₄ formed

Balanced equation

Mg₂Si (s) + 4H₂O (l) ---> 2Mg(OH)₂ (aq) + SiH₄ (g)

Molar mass of Mg₂Si = (24×2) + 28 = 76 g/mol

Mass of Mg₂Si from the balanced equation = 1 × 76 = 76 g

Molar mass of SiH₄ = 28 + (4×1) = 32 g/mol

Mass of SiH₄ from the balanced equation = 1 × 32 = 32 g

SUMMARY

From the balanced equation above,

76 g of Mg₂Si reacted to produce 32 g of SiH₄

From the above information, we can obtain the mass of SiH₄ produced by the reaction of 8.48 g of Mg₂Si as illustrated below:

From the balanced equation above,

76 g of Mg₂Si reacted to produce 32 g of SiH₄

Therefore,

8.48 g of Mg₂Si will react to produce = (8.48 × 32) / 76 = 3.57 g of SiH₄

Thus, 3.57 g of SiH₄ were obtained from the reaction.

2. how to determine the mass of H₂O produced

Balanced equation

4NH₃ (g) + 7O₂ (g) ---> 4NO₂ (g) + 6H₂O (g)

Molar mass of NH₃ = 14 + (1×3) = 17 g/mol

Mass of NH₄ from the balanced equation = 4 × 17 = 68 g

Molar mass of H₂O = (2×1) + 16 = 18 g/mol

Mass of H₂O from the balanced equation = 6 × 18 = 108 g

SUMMARY

From the balanced equation above,

68 g of NH₃ reacted to produce 108 g of H₂O

From the above information, we can obtain the mass of H₂O produced by the reaction of 109.4 g of NH₃ as illustrated below:

From the balanced equation above,

68 g of NH₃reacted to produce 108 g of H₂O

Therefore,

109.4 g of NH₃ will react to produce = (109.4 × 108) / 68 = 173.75 g of H₂O

Thus, 173.75 g of H₂O were obtained from the reaction.

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Identify the parts of the equation by dragging each label below to the correct arrow on the diagram. Drag the items on the left to the correct location on the right.

Answers

The missing labels are:

CuCO₃(s), H₂SO₄(aq): reactants. +: plus sign. CuSO₄(aq), H₂O(l), CO₂(g): products. (s): solid.(aq): aqueous.(l): liquid.(g): gaseous.

What is a chemical equation?

It is a way to represent a chemical reaction.

Let's consider the following chemical equation.

CuCO₃(s) + H₂SO₄(aq) → CuSO₄(aq) + H₂O(l) + CO₂(g)

The missing labels are:

CuCO₃(s), H₂SO₄(aq): reactants. They are on the left side of the equation.+: plus sign. It separates substances.CuSO₄(aq), H₂O(l), CO₂(g): products. They are on the right side of the equation.(s): solid.(aq): aqueous.(l): liquid.(g): gaseous.

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Explain why the middle portion of ship shows more rust than either the top most or the bottom most part

Answers

Answer:

A ship comprises of both visible as well as invisible parts. . The most forward part of a ship is called a Bow, the left-hand side of . at a topmost accessible height of the ship and just above the bridge . The mast is a rangy spar arrangement which is elevated more or less vertically to the Centre line of a ship .

determine the percentage composition by mass of each of the elements in the following compounds
a. calcium chloride, cacl2

Answers

Answer:

63.9%

Explanation:

moral mass of x (# x ions) -divided by- Moral mass of compound.

% of cl = (35.5g) (2 cl ions) -divided by- 111.1g × 100

%= 63.9%

A 1.00-mole sample of dry ice (solid CO₂) is placed in a flexible, sealed container and allowed to sublime. After complete sublimation, what will be the
container volume, in liters, at 26°C and 0.983 atm pressure?

Answers

Container volume, 26°C, and 0.983 atm pressure is =24.9 liters.

What is a Moles?A mole is defined as the quantity of a material that includes precisely 6.02214076 X 1023 of the substance's elementary entities.A substance is said to have a mole with a mass equal to 12.000 g of 12C and the same number of basic units as atoms.The mole can be used to calculate the quantities involved in chemical processes and identify the simplest formula of a compound. The molarity notion, which is related, helps discuss reactions in solutions. The number of moles of a solute in a liter of solution is known as molarity (M).Quantities that cannot be quantified using units like grams or milligrams are referred to as moles. A mole thus counts the quantity of atoms, ions, or molecules.

Container volume, in liters, at 26°C and 0.983 atm pressure:

Given=1.00

V=?

PV=nRT

T=26°C+273.15

=299.15K

R=0.08201Lamt/k

P=0.983atm

V=nRT/p

[tex]V=\frac{1.00 mole(0.08201Lamt/k)299.15K}{0.983atm}[/tex]

V=24.9 liters

Container volume, 26°C, and 0.983 atm pressure is =24.9 liters.

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The Volume in the container is 25L .

What is Ideal Gas?

Ideal gas is hypothetical gas whose molecules occupy negligible space and have no interaction, and which consequently obeys the gas laws exactly.

We have given

Pressure=0.983atm

moles=16

Temperature= 26°C

T →273+26=299K

Volume = ?

PV = nRT

V= 1×0.0821×299/0.983

By solving this equation we get

V= 24.9L≈25L

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Abc Which excerpt from an essay about higher education most clearly shows an example of logos? According to recent studies, more women than ever are attending four-year colleges. In fact, 36.6 percent of women attended college in 2019, compared to 35.4 percent of men. O When I went to college in 1994, I was the first person in my family to do so. My mother stood in my dorm room, surrounded by boxes of clothes and trinkets and holding back tears. O I was in awe of my sociology professor, who had studied the historical impacts of food in African American culture for 10 years. She spoke with such passion and energy that it was difficult to take your eyes off her. O Many college students look to land an exciting internship, believing that it will open doors in their field of study. However, internships can often distract from schoolwork. Mark this and return Save and Exit Next Submit

Answers

The excerpt from an essay about higher education that most clearly shows an example of logos is:

Option d: Many college students look to land an exciting internship, believing that it will open doors in their field of study. However, internships can often distract from schoolwork.

What is Logos?

The Logos Definition is one that is often argued by a lot of people as people tends to appeal to others emotions and some other times, people do appeal to one's' ethics or morals.

The term logos is a term that connote the use of logic. It also includes the use of deductive reasoning to get to a conclusion.

The excerpt from an essay about higher education that most clearly shows an example of logos is:

Option d: Many college students look to land an exciting internship, believing that it will open doors in their field of study. However, internships can often distract from schoolwork.

Option d is correct because it shows the cause and its effect.

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What is oxidized in the reaction below?
H₂ + Cl₂
2HCI

Answers

Answer:

Dihydrogen

Explanation:

Dihydrogen is FORMALLY oxidized.... i.e. its oxidation number increases... And we adds the half equations together such that the electrons are eliminated

Here oxidation number or oxidation state of hydrogen and chlorine at reactant is 0. And oxidation numbers of hydrogen and chlorine are 1 and —1 respectively. So hydrogen is oxidized whereas chlorine is reduced.

Look at Table 4 in the procedure portion of the experiment. Calculate the pH you would expect each of the buffer solutions (A, B, C, D, and E) to be using the Henderson-Hasselbalch equation, assuming that the solutions of acetic acid and sodium acetate are equimolar.

Answers

The pH of the buffer solutions as determined using the Henderson–Hasselbalch equation are:

A. pH = 4.75B. pH = 4.05C. pH = 3.75D. pH = 5.75E. pH = 5.45

What is the pH of the solutions?

The pH of a buffer is determined using the Henderson–Hasselbalch equation shown below:

pH = pKₐ + log([A⁻]/[HA])

A. Volume of acetic acid = 5 mL; Volume of sodium acetate = 5 mL; pka of acetic acid = 4.75