Which statement describes a major drawback of the Bohr model that caused scientists to replace it?
(A) It worked only for helium and larger atoms.
(B) It did not identify the distance between an electron and the nucleus.
(C) It contradicted the Heisenberg uncertainty principle.
(D) It stated that spectral lines of atoms are similar.
on edgen

Answer:

These are called isotopes. They have the same number of protons (and electrons), but different numbers of neutrons. Different isotopes of the same element have different masses. Mass is the word for how much substance (or matter) something has.

Answer:

The Universe is constantly expanding and as it expands the stars and objects in space move farther apart, just like the points on the balloon when air is blown into it. Density and distribution of "stars" as the balloon expands because when volume increases the density will increase.

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There are 674 mg of calcium carbonate in a Rolaids tablet

Reaction

CaCO₃ + 2HCl ⇒ CaCl₂ + CO₂ +H₂O

V HCl = 24.65 ml

M HCl = 0.547

mol HCl :

[tex]\tt 24.65\times 0.547=13.48~mlmol[/tex]

ratio mol CaCO₃ : HCl = 1 : 2, so mol CaCO₃ :

[tex]\tt \dfrac{1}{2}\times 13.48=6.74~mlmol=6.74\times 10^{-3}~mol[/tex]

mass of CaCO₃ (MW=100~g/mol) :

[tex]\tt 6.74\times 10^{-3}\times 100=0.674~g=674~mg[/tex]

Answer:

1.092

Explanation:

Density = 1.0192 g/mL

oecific gravity = ?

Specific gravity is the ratio of a material's density with that of water.

The density of water at 4 degrees Celsius =  1 g/mL

Specific gravity = 1.0192 / 1 = 1.0192

Because specific gravity is a ratio, it has no dimension.

Answer:

A chemical reaction is the process in which atoms present in the starting substances rearrange to give new chemical combinations present in the substances formed by the reaction. These starting substances of a chemical reaction are called the reactants, and the new substances that result are called the products.

Mass of Cyclohexen : 10.2 g

Reaction

3 C6H10 + 4 Na2Cr2O7 + 16 H2SO4 >

3 C6H10O4 + 4 Cr2(SO4)3 + 4Na2SO4 + 16 H2O

mol C6H10 : mol C6H10O4 = 3 : 3 = 1 : 1

[tex]\tt \%yield=\dfrac{actual}{theoretical}\times 100\%\\\\68.6\%=\dfrac{12.5}{theoretical}\times 100\%\\\\theoretical=18.22~g[/tex]

12.5 grams of C6H10O4 , mol C6H10O4 (MW 146.14 g/mol):

[tex]\tt \dfrac{18.22}{148}=0.123[/tex]

mol C6H10 = mol C6H10O4 = 0.124

mass C6H10 :

[tex]\tt 0.124\times 82.16=10.2~g[/tex]

Answer:

Crystalline solids have well-defined edges and faces, diffract x-rays, and tend to have sharp melting points. In contrast, amorphous solids have irregular or curved surfaces, do not give well-resolved x-ray diffraction patterns, and melt over a wide range of temperatures.

Explanation:

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The mass of 16.6 × 10²³ molecules of barium nitrate is 718.7g

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Answer:

B. because if it was to change so would the amount of wieght that gravity puts on us.

Explanation:

A. might seem right but it's not 35,000 under seal level is the OPPOSITE of 35,000 above sea level.

C. water pressure can change where you are at because of the speed or the type of body of water.

D. it does not make any sense.

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The empirical formula : CaAsO₄H

The empirical formula is the smallest comparison of atoms of compound =mole ratio of the components

The principle of determining empirical formula

[tex]\tt \dfrac{22.3}{40.078}=0.556[/tex]

[tex]\tt \dfrac{41.6}{74.9246}=0.555[/tex]

[tex]\tt \dfrac{35.6}{15.9994}=2.225[/tex]

[tex]\tt \dfrac{0.56}{1.00794}=0.556[/tex]

Divide by the smallest ratio(0.555) :

Ca : As : O : H ⇒

[tex]\tt \dfrac{0.556}{0.555}\div \dfrac{0.555}{0.555}\div \dfrac{2.225}{0.555}\div \dfrac{0.556}{0.555}=1\div 1\div 4\div 1[/tex]

Answer:

The correct movement would be -

1. Water  - into solution A.

2. NaCl  - into solution A.

3. glucose  - into Solution B.

4. Albumin  - neither.

Explanation:

All the substances are separated by the semipermeable membrane and the semipermeable membrane allows the only small molecule to pass through it. So the movement of the given substance would be -

1. Water  - into solution A.

Water molecules are small and can easily pass through the semipermeable membrane as it is given that the solution b has low solute concentration and solution A has high solute concentration. It is known that the movement of the solvent always takes place from low solute concentration to high so the movement of water will be into solution A.

2. NaCl  - into solution A.

The movement of small ionic molecule NaCl is always from high to low concentration as it is given that solution B has high concentration than solution A so movement will take place into solution A.

3. glucose  - into Solution B.

It is also a small molecule and moves from the high glucose region to the low glucose concentration region, in solution A the concentration of glucose is high than solution B so movement would be into solution B.

4. Albumin  - neither.

Albumin is a protein which is macromolecule and large in size to pass through the semipermeable membrane so, albumin move neither solution A nor solution B.

Answer:

V₂ =  511.59mL

Explanation:

Given data:

Initial volume = 450 mL

Initial pressure = 744 mmHg

Initial temperature = 33°C (33 +273 = 306 K)

Final temperature = 66°C (66+273 = 339 K)

Final pressure = 725 mmHg

Final volume =?

Formula:  

P₁V₁/T₁ = P₂V₂/T₂  

P₁ = Initial pressure

V₁ = Initial volume

T₁ = Initial temperature

P₂ = Final pressure

V₂ = Final volume

T₂ = Final temperature

Solution:

V₂ = P₁V₁ T₂/ T₁ P₂  

V₂ = 744 mmHg × 450 mL × 339 K / 306 K ×725 mmHg

V₂ = 113497200 mmHg .mL. K / 221850 K.mmHg

V₂ =  511.59mL

Answer:

a. 167 mL.

b. 39.3 %.

Explanation:

Hello!

In this case, for the undergoing chemical reaction, since 45.0 g of aluminum react, based on the 2:3 mole ratio with sulfuric acid, we can compute the required moles  as shown below:

[tex]n_{H_2SO_4}=45.0gAl*\frac{1molAl}{27.0gAl} *\frac{3molH_2SO_4}{2molAl} =2.50molH_2SO_4[/tex]

Next, since the molarity of a solution is computed based on the moles and volume (M=n/V), we can compute the required volume of sulfuric acid as shown below:

[tex]V=\frac{n}{M}=\frac{2.50mol}{15.0mol/L}=0.167L[/tex]

That in mL is 167 mL.

Moreover, for the percent yield, we compute the grams of aluminum sulfate that are produced based on the required 2.50 moles of sulfuric acid:

[tex]m_{Al_2(SO_4)_3}=2.50molH_2SO_4*\frac{1molAl_2(SO_4)_3}{3molH_2SO_4}*\frac{342.15gAl_2(SO_4)_3}{1molAl_2(SO_4)_3} \\\\m_{Al_2(SO_4)_3}=285.13gAl_2(SO_4)_3[/tex]

Therefore the percent yield is:

[tex]Y=\frac{112g}{285.13g}*100\%\\\\Y=39.3\%[/tex]

Best regards!

Answer:

The temperature is on the y-axis and the time is on the x-axis.

Explanation:

Which statement describes how phase changes can be diagrammed as a substance is heated? (D is the answer)

The phase is on the y-axis and the temperature is on the x-axis.

The temperature is on the y-axis and the phase is on the x-axis.

The time is on the y-axis and the temperature is on the x-axis.

The temperature is on the y-axis and the time is on the x-axis.

Which statement describes the appearance of a temperature-vs.-time graph? (C is the answer)

A horizontal line shows that the temperature increases at a constant rate over time.

A vertical line shows that the temperature decreases at a constant rate over time.

Horizontal lines where the temperature is constant during phase changes connect upward-sloping lines where the temperature increases.

Horizontal lines where the temperature increases are connected by upward-sloping lines where the temperature is constant for each phase.

Answer:

Explanation:

159 mL of .135 M benzoic acid will contain

.159 x .135 = .021465 moles of benzoic acid.

Molecular weight of benzoic acid = 122 gm

grams of .021465 moles = 122 x .021465 = 2.6 grams .

So 2.6 grams of benzoic acid will be required .

Answer:

Explanation:

1)

Given data:

Mass of Al₂O₃ = 18.3 g

Number of moles = ?

Solution:

Number of moles = mass/molar mass

Number of moles = 18.3 g/ 101.96 g/mol

Number of moles =0.18 mol

2)

Given data:

Mass of CaO needed = 35 g

Number of moles = ?

Solution:

Number of moles = mass/molar mass

Number of moles = 35 g/ 56 g/mol

Number of moles =0.625 mol

3)

Given data:

Mass of H₂SO₄  needed = 126 g

Number of moles = ?

Solution:

Number of moles = mass/molar mass

Number of moles = 126 g/ 98.1 g/mol

Number of moles = 1.28 mol

4)

Given data:

Mass of vinegar = 100 g

Number of moles = ?

Solution:

Number of moles = mass/molar mass

Number of moles = 100 g/ 60.1 g/mol

Number of moles = 1.66 mol

Answer:

c. hydrogen bonding.

Explanation:

Hydrogen bonding occurs when hydrogen is covalently bonded to a highly electronegative atom such as oxygen, flourine, nitrogen etc.

Hydrogen bonds are quite strong and are known to lead to elevated boiling points. As a result of hydrogen bonding, ammonia is known to have a high melting and boiling point compared to its relative molecular mass.

A definition is an explanation of a word or a term for clarity.

The term definition has to do with the correct explanation of a term or word.

The following are the appropriate definitions of the words;

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1. Heretic: A heretic is a person who disagrees with an accepted belief. For example, during the Middle Ages, individuals who questioned or challenged the teachings of the Catholic Church were often labeled as heretics.

2. Influence: Influence refers to the ability to have an effect on someone or something. It can be the power to shape someone's opinions, decisions, or behavior. For instance, parents, teachers, and friends can have a significant influence on a person's choices and actions.

3. Technology: Technology refers to the practical application of knowledge, tools, and crafts. It involves using scientific and engineering principles to create new devices, processes, or systems that enhance human life. Examples of technology include smartphones, computers, and medical equipment.

4. Skepticism: Skepticism is an attitude of doubt or a belief that knowledge is not certain. Skeptics question claims, ideas, or beliefs and seek evidence or logical reasoning to support them. For instance, a person who is skeptical of conspiracy theories would ask for concrete evidence before accepting such claims as true.

5. Habit: A habit is a usual behavior, attitude, or quality that is acquired through repetition and becomes automatic. It is often formed by consistently performing a specific action. For example, brushing teeth before bed can become a habit through repetition and eventually be done without conscious thought.

Sorry that was a lot to read (lol)

Answer:

CH₄ + 2O₂   →    2H₂O + CO₂

Explanation:

Chemical equation:

CH₄ + O₂   →    H₂O + CO₂

Balanced chemical equation:

CH₄ + 2O₂   →    2H₂O + CO₂

Option d is correct option.

1st step:

CH₄ + O₂   →    H₂O + CO₂

Left hand side                    Right hand side

C = 1                                       C = 1

H = 4                                      H = 2  

O =  2                                     O = 3

Step 2:

CH₄ + O₂   →    2H₂O + CO₂

Left hand side                    Right hand side

C = 1                                       C = 1

H = 4                                      H = 4  

O =  2                                     O = 4

Step 3:

CH₄ + 2O₂   →    2H₂O + CO₂

Left hand side                    Right hand side

C = 1                                       C = 1

H = 4                                      H = 4  

O =  4                                     O = 4

Answer:

Because only regular-shaped objects have a consistent length, width, height, and shape.

Explanation:

Because only regular-shaped objects have a consistent length, width, height, and shape. When dealing with an object composed of differing shapes, your must calculate each portion separately and then add them.

Ones day my include eating, resting, exercising. Unfortunately mine included not eating, not sleeping, and not exercising. I lay wife awake on my bed wishing for deaths door to find me sooner than later. I do my chores because if I don’t then my parents may take away the few things I love most. In conclusion, my daily activities include thoughts of “ why am I still alive” and actions of crying, punching ext.

Answer:

Measure 74.2 g Na2CO3 and add H20 until the final homogeneous solution has a volume of 7.00 L

Explanation:

The best procedure is

Mole of

[tex]Na_2CO_3 = Volume \times molarity\\\\= 7.00 L \times 0.100 mol\\\\[/tex]

= 0.700 mol

The mass of

[tex]Na_2Co_3 = Moles \times molar\ mass \\\\= 0.700 mol \times 106 g/mol[/tex]

= 74.2 g

So as per the above calculation, the option 3 is correct as the solution volume is 7.00 L so the same is to be considered

hence, all other options are wrong

Answer:

The number becomes smaller

Explanation:

Volume = 5800mL

To be converted to L

The relationship between mL and Liters is given as;

1 L = 1000 mL

This means that;

1 L = 1000 mL

x L = 5800 mL

x = 5800 / 1000 = 5.8 L

Comparing 5.8 with 5800, the number becomes smaller.

Answer:

He won 32 games.

Explanation:

Another way of expressing 75% is 75/100.

To calculate how many games the baseball pitcher won, we multiply the total of games played (43, in this case) by the percent won:

43 * 75/100 = 32.25 ≅ 32

So the baseball pitcher won 32 games.

Answer:

[tex]C_{zinc}=0.400\frac{J}{g\°C}[/tex]

Explanation:

Hello!

In this case, by considering thermodynamics and the temperature of zinc, we can infer it is hot while water is cold, it means that the heat lost by the zinc is gained by the water and we can write:

[tex]Q_{Zn}=-Q_{water}[/tex]

In terms of mass, specific heat and temperatures we can write:

[tex]m_{Zn}C_{Zn}(T_{eq}-T_{Zn})=-m_{water}C_{water}(T_{eq}-T_{water})[/tex]

In such a way, by solving for the specific heat capacity of the zinc we write:

[tex]C_{zinc}=\frac{-m_{water}C_{water}(T_{eq}-T_{water})}{m_{Zn}(T_{eq}-T_{Zn})}[/tex]

Thus, by plugging in the given values we obtain:

[tex]C_{zinc}=\frac{-45.0g*4.184\frac{J}{g\°C}* (27.1\°C-98.8\°C)}{13.8g*(27.1\°C-98.8\°C)}\\\\C_{zinc}=0.400\frac{J}{g\°C}[/tex]

Best regards!

Answer:

its DDDDDDDDDDDDDDDDDD

The structure that is least likely to exist is HS.

Sulfur is an element in group 16. Sulfur is a divalent element that has two lone pairs of electrons. This means that sulfur forms compounds in which it is bonded to two atoms or groups.

All the molecules listed can exist because they consists of structures in which sulfur is bonded to two atoms or groups. The only structure that can not exist is HS because it does not satisfy the valency of sulfur.

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Answer:

Seeds need oxygen so that they can produce energy for germination and growth. The embryo gets energy by breaking down its food stores. Like all organisms, this is done through a process known as aerobic respiration. —a series of reactions where energy is released from glucose, using oxygen.