Which of the following statements is NOT part of collision theory?A.) Molecules need to collide in order to react.B.) Molecules must have the correct position when they collide in order to react.C.) Molecules need to overcome activation energy to react.D.) Molecules must have high surface area in order to react.

Answer:

Explanation:

atomic weight of B= 10.8

atomic weight of h = 1.0

B2H6 = 2*10.81+6*1= 27.62

out of total 27.62 the Boron contrubtion was = 2*10.81= 21.62

For 27.62 B2H6  ---- 21.62 is B

for 100 B2H6  = 21.62*100 /27.62

                       = ...........%

can you calcualte and the coorect answer ?

Answer:

The correct answer is E. 78%.

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Answer:

28645 years

Explanation:

Given the formula;

0.693/t1/2 = 2.303/t log (No/N)

Given that N = 1/32 No

Note;

t1/2 = half life of Carbon-14

t = time required for N amount of carbon -14 to remain= 5,730 years

No= amount of carbon 14 initially present

N = amount of carbon-14 after time t

Substituting values;

0.693/5,730 = 2.303/t log (No/1/32No)

0.693/5,730 = 2.303/t log 32

1.21 * 10^-4      = 3.466/t

t = 3.466/1.21 * 10^-4

t = 28645 years

Any preserved imprints, remains and traces of once a living organism from history are called fossils. By utilizing the radioactive property of organic compounds one can determine the age of an object.

The approximate age of the fossilizes remain is 28645 years.

This can be estimated as:

The formula used will be:

\(\dfrac{0.693}{\dfrac{t1}{2}}= \dfrac{2.303}{t} log (\dfrac{No}{N})\)

Where,

Given,

N = \({\dfrac{1}{32} No\)

Replacing values in formula:

\(\dfrac{0.693}{5,730} & = \dfrac{2.30}{t} log \:({{\dfrac{No}{\dfrac{1}{32} No}})\)

\(\dfrac{0.693}{5,730} & = \dfrac{2.30}{t} \;log 32\)

\(1.21 \times 10^{-4} = \dfrac{3.466}{t}\)

\(t = \dfrac{3.466}{1.21} \times 10^{-4}\)

\(t = 28645 \:\text{years}\)

Therefore, the approximate age of the fossil is 28645 years.

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Answer: twice the momentum

Explanation:

Forensic science is described as the application of science to law. 2. The fictitious adventures of Sherlock Holmes piqued the interest of a younger group of forensic scientists as well as criminal detectives.

Forensic science was an important component of the criminal justice system. Forensic scientists study and analyze evidence collected from crime scenes as well as other locations to produce objective results that can aid in the investigation as well as prosecution of criminal criminals or clear an innocent person of such suspicion.

DNA testing as well as analysis is now regarded as the most reliable of any and all forensic tools. Unlike lot of people of the others assembled to address the requirements of law enforcement, it was subjected to rigorous scientific experimentation as well as validation before being used in forensic science.

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A 50.0 mL solution of 0.250 M HC₂H₃O₂ before and after adding 50 mL of 0.250 M NaOH has a pH of 2.87, the pH changes due to the formation of a buffer solution, which can be calculated using the Henderson-Hasselbalch equation.

This problem requires us to calculate the pH of a buffer solution after the addition of a strong base. A buffer solution is one that resists pH changes when modest amounts of acid or base are added. The buffer system in this case is the weak acid, acetic acid (HC₂H₃O₂) and its conjugate base, acetate ion (C₂H₃O₂-).

Before the addition of NaOH, we have a solution of 0.250 M HC₂H₃O₂, which we can assume to be completely dissociated in water:

HC₂H₃O₂ + H₂O ⇌ H₃O+ + C₂H₃O₂-

HC₂H₃O₂ has a Ka value of 1.8 x 10-5. We can use this Ka value to calculate the equilibrium concentration of H3O+ and C₂H₃O₂- in the solution.

First, we need to calculate the initial concentrations of HC₂H₃O₂ and C₂H₃O₂-.

moles of HC₂H₃O₂ = 0.250 M × 0.0500 L = 0.0125 mol

moles of C₂H₃O₂- = 0 mol (since there is no NaOH added yet)

Since HC₂H₃O₂ is a weak acid, it only partially dissociates in water. The equilibrium concentrations of H₃O+ and C₂H₃O₂- can be calculated using the Ka expression:

Ka = [H₃O+][C₂H₃O₂-]/[HC₂H₃O₂]

We can assume that the initial concentration of H3O+ is negligible compared to the amount that will be produced by the dissociation of HC₂H₃O₂, so we can simplify the expression to:

Ka = [H₃O+]²/[HC₂H₃O₂]

[H₃O+]² = Ka × [HC₂H₃O₂]

[H₃O+]² = 1.8 × 10⁻⁵ × 0.0125

[H₃O+] = 1.34 × 10⁻³ M

Now that we know the equilibrium concentration of H₃O+, we can use the pH formula to calculate the pH:

pH = -log[H₃O+]

pH = -log(1.34 × 10⁻³)

pH = 2.87

This is the pH of the buffer solution before the addition of NaOH.

Next, we add 50 mL of 0.250 M NaOH to the solution. NaOH is a strong base, so it completely dissociates in water to produce OH- ions:

NaOH → Na+ + OH-

The OH- ions will react with the acetate ions in the buffer solution to form water and acetate ions:

OH- + C₂H₃O₂- → H₂O + C₂H₃O₂-

This reaction will consume some of the acetate ions in the buffer solution, causing the equilibrium to shift to the left to produce more acetate ions.

To calculate the new concentrations of H₃O+ and C₂H₃O₂-, we need to use the Henderson-Hasselbalch equation:

pH = pKa + log([C₂H₃O₂-]/[HC₂H₃O₂])

where pKa = -log(Ka), [C₂H₃O₂-] is the equilibrium concentration of acetate ions, and [HC₂H₃O₂] is the equilibrium concentration of acetic acid.

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Explanation:

To determine the molar mass of the gas, we need to use the ideal gas law equation:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles of gas, R is the gas constant, and T is the temperature. We can rearrange this equation to solve for the number of moles:

n = (PV) / (RT)

We are given the mass of the gas (0.643 g), the volume (125 mL), the pressure (60. cm Hg), and the temperature (25°C). To use these values in the ideal gas law equation, we need to convert the volume to liters and the pressure to atmospheres (atm) and the temperature to Kelvin (K):

V = 125 mL = 0.125 L

P = 60. cm Hg = 0.789 atm (using the conversion factor 1 atm = 760 mm Hg and 1 cm Hg = 1.33322 mm Hg)

T = 25°C + 273.15 = 298.15 K

Substituting these values into the ideal gas law equation and solving for n gives:

n = (PV) / (RT) = (0.789 atm x 0.125 L) / (0.0821 L·atm/mol·K x 298.15 K) = 0.00314 mol

To find the molar mass, we can use the formula:

molar mass = mass of sample / number of moles

molar mass = 0.643 g / 0.00314 mol = 204.46 g/mol

Therefore, the molar mass of the gas is approximately 204.46 g/mol.

Answer:

To determine the molar mass of the gas, we need to use the ideal gas law, PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature. We can rearrange this equation to solve for n:

n = PV/RT

First, we need to convert the pressure to atmospheres (atm) and the volume to liters (L):

cm Hg = 0.788 atm (using the conversion factor 1 atm = 760 mm Hg)

125 mL = 0.125 L

Next, we can substitute the given values into the equation and solve for n:

n = (0.788 atm)(0.125 L)/(0.0821 L·atm/mol·K)(298 K) = 0.00472 mol

Finally, we can calculate the molar mass by dividing the mass of the sample by the number of moles:

molar mass = 0.643 g/0.00472 mol = 136 g/mol (rounded to three significant figures)

Therefore, the molar mass of the gas is approximately 136 g/mol.

Answer:

= 3.456 × 1011

Explanation:

Answer:

P.E for the 4kg bowling ball held 2.5 meters above head is 100j, while the other is 60j so the 4kg ball has more potential energy

Answer:

a

Explanation:

Answer

Volume of KCl = 4.918 L

Explanation

Given:

Concentration/molarity of KCl = 1.50 M

Mass of KCl = 550 g

We know molar mass of KCl = 74.5513 g/mol

Required: Volume of KCl

Solution:

Step 1: Calculate the moles of KCl

n = m/M where n is the moles, m is the mass and M is the molar mass

n = 550g/74.5513 g/mol

n = 7.377 mol

Step 2: Calculate the volume of KCl

C = n/V where C is the concentration, n is the moles and V is the volume

V = n/C

V = 7.377 mol/1.50 mol/L

V = 4.918 L

Answer:

B.K2(OH)2 i think that is the answer

Answer:

\(W = 6.65 \cdot 10^{6} lbf\)

Explanation:

To find the weight (W) of the pond contents first we need to use the following equation:

\( W = m\cdot g \)   (1)

Where m the mass and g is the gravity  

Also, we have that the mass is:

\(m = \rho*V\)  (2)    

Where ρ is the density and V the volume

We cand calculate the volume as follows:

\( V = L*w*d \)   (3)

Where L is the length, w is the wide and d is the depth  

By entering equation (2) and (3) into (1) we have:

\(W = \rho*L*w*d*g\)

\( W = 75.3 lbm/ft^{3}*50 m*25 m*2 m*9.81 m/s^{2} \)  

\(W = 75.3 lbm/ft^{3}*\frac{(1 ft)^{3}}{(0.3048 m)^{3}}*\frac{0.454 kg}{1 lbm}*50 m*25 m*2 m*9.81 m/s^{2} = 2.96 \cdot 10^{7} N}*\frac{0.2248 lbf}{1 N} = 6.65\cdot 10^{6} lbf\)              

Therefore, the weight of the pond is 6.65x10⁶ lbf.

I hope it helps you!

Answer:

The answer is 2.31×10^12

Explanation:

(4.2×10^9)(5.5×10^2)

(4.2×5.5)×(10^9×10^2)

23.1×10^9+2

23.1×10^11

Answer:2.31×10^12

Based on the given reactions, the compounds are as follows:

A: The specific product formed from the reaction between prop-1-yne and either 2HBr or H2O2.

B: The product formed when compound A reacts with 2H2O.

C: The product formed when compound B reacts with K2CO3(aq).

D: The product formed from the heat-induced reaction of compound C.

E: The product formed when compound D reacts with HBr.

Based on the given reactions, let's analyze the compounds involved:

Reaction 1: prop-1-yne + 2HBr/H2O2 = A

The reactant prop-1-yne reacts with either 2HBr or H2O2 to form compound A. The specific product formed will depend on the reaction conditions.

Reaction 2: A + 2H2O = B

Compound A reacts with 2H2O (water) to form compound B.

Reaction 3: B + K2CO3(aq) = C

Compound B reacts with K2CO3(aq) (potassium carbonate dissolved in water) to form compound C.

Reaction 4: C + heat = D

Compound C undergoes a heat-induced reaction to form compound D.

Reaction 5: D + HBr = E

Compound D reacts with HBr (hydrobromic acid) to form compound E.

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283.875 mL of ethanol are in a 0.750gallon sample of the gasohol. Therefore, the correct option is option A.

Ethanol, sometimes known as ethyl alcohol, is a chemical liquid having the formula C2H5OH. Its primary application is as a solvent. To comprehend the chemical composition of ethanol, you must first grasp what alkenes are.

Alkenes are carbon and hydrogen molecules containing at at least one double bond between two carbons. Ethene is an example of an alkene.

1 gall = 3.785 L

0.750gallon =?

0.750gallon ×3.785 L / 1 gallon

= 2838.75 ml

10% of  2838.75 ml= 283.875 mL

Therefore, the correct option is option A.

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The correct options that apply during a chemical change are:

A) One atom or more changes into atoms of another element.

B) New substances with different properties are formed.

C) Solids, liquids, or gases may form. Option A, B and C

During a chemical change, the arrangement of atoms in molecules is altered, resulting in the formation of new substances with different chemical properties. This is represented by option B. For example, when hydrogen gas (H₂) reacts with oxygen gas (O₂), a chemical change occurs, and water (H₂O) is formed. The properties of water, such as boiling point, density, and chemical reactivity, are distinct from those of its constituent elements.

Additionally, during a chemical change, atoms can rearrange to form molecules of different elements, as indicated in option A. For instance, during a nuclear reaction, such as radioactive decay, the nucleus of an atom can change, leading to the formation of atoms of different elements.

Option C is also correct. Depending on the specific reaction conditions, chemical changes can result in the formation of solids, liquids, or gases. For example, when a metal reacts with an acid, such as zinc with hydrochloric acid, a gas (hydrogen) is produced.

Options D and E are not universally applicable to all chemical changes. While some reactions may release heat energy (exothermic reactions), others may absorb heat energy (endothermic reactions). The requirement for heating or the release of heat depends on the specific reaction and its energy considerations.

In summary, during a chemical change, atoms can change into atoms of another element (A), new substances with different properties are formed (B), and solids, liquids, or gases may form (C).

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Answer:

C. One type of atom is oxidized and another is reduced

D. Electrons are transferred from one atom to another

Explanation:

just took the test, i hope this helps!!

have a nice day and take care of yourself!! :))

One type of atom is oxidized and another is reduced and  Electrons are transferred from one atom to another. Therefore, the correct options are options C,D.

Any chemical process in which a participating chemical species' oxidation number changes is known as an oxidation-reduction reaction, often known as a redox reaction. The phrase refers to a broad range of processes. Numerous oxidation-reduction processes are as frequent and well-known as fire, metal corrosion and disintegration, fruit browning, respiration, and photosynthesis—basic life processes.

The combined processes of oxidation and reduction are known as redox reactions due to their complimentary nature. The oxidising agent is the reactant that causes the oxidation, while the reducing agent itself reduces this reagent.  One type of atom is oxidized and another is reduced and  Electrons are transferred from one atom to another.

Therefore, the correct options are options C,D.

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The statement that should describe the temperature of the region at the equator is that it can be associated with perpendicular solar radiation.

The Equator line at zero (0) latitude is an imaginary line that divides the Earth's planet into two equal parts composed of South latitudes and North latitudes.

Temperatures at low latitudes, i.e., near the Equator line, are warmer because this region receives perpendicular solar rays all the year, thereby the energy of solar radiation is distributed to the Earth's surface.

In conclusion, the statement that should describe the temperature of the region at the equator is that it can be associated with perpendicular solar radiation.

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What causes the changes in the ice ages is when the earth's orbits tilts.

The ice ages are caused by changes in Earth's orbit and tilt, which affect the amount of solar radiation received by the planet. These changes alter the climate and trigger the growth and retreat of ice sheets.

We know that the changes in the climates is responsible for most of the changes that we can see in the universe as we have come to experience it today.

Thus the earth's orbits is what does control the changes in the ice ages.

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An example of a biotic factor of an aquarium ecosystem is an  algae growing on the glass. Option B is the correct answer.

This refers to a living organism that shapes its environment. The examples of biotic factor that make up fresh water ecosystem are: aquatic plants, fish, amphibians,fungi, bacteria, and protists. and algae.

The biotic factors are gropped into : producers, consumers, and decomposers.

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The interaction of sodium hydroxide (NaOH), hydronium ion (H₃O⁺), and 2-nitropentane. It appears to involve both acid-base reactions and nucleophilic substitution. Here is a theory for the reaction's mechanism:

Step 1: Deprotonation

Strong base NaOH sodium hydroxideinteracts with hydrogen ion H₃O⁺ to produce water (H₂O) and sodium hydronium ion (NaH₃O⁺):

H₃O⁺ + NaOH → H₂O + NaH₃O⁺

Step 2: Nucleophilic Attack

The carbon-nitrogen double bond in NaH₃O⁺ is attacked by the deprotonated nitropentane anion, which is produced from 2-nitropentane, acting as a nucleophile:

NaH₃O⁺ + Nitropentane → Na+ + Nitropentane Anion

Step 3: Protonation

The end product, 2-nitropentanol, is created when water (H₂O), acting as a proton donor, donates a proton to the nitropentane anion:

Nitropentane Anion + H₂O → 2-Nitropentanol

The complete reaction can be summarized as follows:

2-nitropentane + NaOH/H₃O⁺ → 2-nitropentanol + Na⁺ + H₂O

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Answer:

From the law of thermodynamics;

The heat from the hotter body will be transfered to the colder till it reaches the thermal equilibrium when all bodies attain the same temperature.

\(.\)

Answer:

Explanation

Boron (B)

Silicon (Si)

Germanium (Ge)

Arsenic (As)

Antimony (Sb)

Tellurium (Te)

Polonium (Po

Answer:

Although he was unaware ofit, Mendeleev had actually placed the elements inorder of increasing “atomic number,” a numberrepresenting the amount of positively charged protons in the atom (also thenumber of negatively charged electronsthat orbit the atom). Mendeleev went even further.

Answer:

Explanation:

Yes

Answer:

H3PO4

Explanation:

The H3PO4 is an acid as it release H+ ion when dissolved in a solution and H3PO4 is known as phosphoric acid

The concentration of the HNO₃ solution needed to neutralize the 27.60 mL of 1.00 M NaOH is 2.76 M

The balanced equtaion is given below:

HNO₃ + NaOH —> H₂O + NaNO₃

Now, we shall obtain the concentration of the HNO₃ solution needed for the neutralization reaction. This is shown below:

CaVa / CbVb = nA / nB

(Ca × 10) / (1 × 27.6) = 1

(Ca × 10) / 27.6 = 1

Cross multiply

Ca × 10 = 27.6

Divide both side by 10

Ca = 27.6 / 10

Ca = 2.76 M

Thus, the concentration of the HNO₃ solution needed is 2.76 M

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Answer:

a. A color change

c. Precipitate being formed

e. A change in temperature

f. Bubbles being produced

Explanation:

Two types of changes occur namely: physical changes and chemical changes. A physical change does not affect the chemical composition of the substance involved. Physical changes include change of state etc.

However, on the other hand, a chemical change alters the chemical composition of the substances involved, hence, leading to the formation of new product(s). It is also called a chemical reaction. Since a new product is formed from the alteration of the chemical nature of the reacting substances, the following changes or indicators will be present or evident in a chemical reaction:

- color change of substance

- Precipitate being formed i.e. solid deposit

- A change in temperature

- Bubbles being produced (evolution of gas)