2) When the combustion engine was invented it had many positive effects on society, but years later it has been discovered that the burning of oil and coal has one major negative effect on the environment. What is that negative effect

Answer:

Temperature

Explanation:

Answer:

This option is correct

Explanation:

Molecules are expressed in the form of Lewis in order to simplify their expression or chemical study, but this does not mean that they manifest or respect this form in all three dimensions since some are generally unstable, or even in the third dimension, these locations between atoms are respected for the characteristics of their unions.

  The statement "It is better to apply proven solutions than to try and invent something new" is subjective and cannot be definitively categorized as true or false. The appropriateness of applying proven solutions or seeking new inventions depends on the specific context, problem, and available resources.

  The effectiveness of applying proven solutions or pursuing new inventions depends on various factors. In some cases, proven solutions have been extensively tested, refined, and proven to be reliable and efficient. Utilizing such solutions can save time, resources, and reduce risks associated with unknown outcomes.

  However, there are instances where new inventions are necessary to address emerging challenges or to improve existing solutions. Innovation and the development of new ideas can lead to advancements, breakthroughs, and more efficient approaches. In such cases, relying solely on proven solutions may limit progress and hinder the exploration of potentially superior alternatives.

  Ultimately, the choice between applying proven solutions and inventing something new should be based on a thorough assessment of the specific situation, including the complexity of the problem, available resources, potential benefits and risks, and the need for creativity and adaptability. It is essential to strike a balance between utilizing proven solutions when appropriate and fostering innovation when required to drive progress and improvement.

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Answer:

\(\boxed {\boxed {\sf 0.6692 \ mol \ AlCl_3}}\)

Explanation:

To convert from grams to moles, we must use the molar mass. This can be calculated using the Periodic Table.

1. Molar Mass

First, identify the elements in the compound AlCl₃. They are aluminum and chlorine. Now find the masses:

Take a look at the compound. There is a subscript of 3 after chlorine, so we must multiply its molar mass by 3 then add aluminum's.

2. Convert Grams to Moles

We can use the molar mass as a ratio.

\(\frac{133.331538 \ g \ AlCl_3}{1 \ mol \ AlCl_3}\)

Multiply by the given number of grams: 89.23

\(89.23 \ g \ AlCl_3 * \frac{133.331538 \ g \ AlCl_3}{1 \ mol \ AlCl_3}\)

Flip the fraction so the grams of aluminum chloride cancel out.

\(89.23 \ g \ AlCl_3 * \frac{1 \ mol \ AlCl_3}{133.331538 \ g \ AlCl_3} = 89.23 \ * \frac{1 \ mol \ AlCl_3}{133.331538}\)

\(\frac{89.23 \ mol \ AlCl_3}{133.331538}\)

\(0.6692340112 \ mol \ AlCl_3\)

3. Round

The original measurement of grams has 4 significant figures. We must round to 4 sig figs.

For the number we calculated, that is the ten thousandth place.

The 3 in the hundred thousandth place tells us to leave the 2.

\(0.6692 \ mol \ AlCl_3\)

There are about 0.6692 moles of aluminum chloride in 89.23 grams.

Answer:

The relationship of genotype to phenotype is rarely as simple as the dominant and recessive ... Why can you possess traits neither of your parents have? ... so concluded that there were some traits that dominated over other inherited traits. ... to notice a variety of relationships between alleles that code for the same trait.

Answer:

A. Anticline

Explanation:

Answer:A

Explanation:

The relationship between pressure and volume of a gas is described by Boyle's Law, which states that the pressure and volume of a gas are inversely proportional to each other when temperature is held constant. Mathematically, this can be expressed as P1V1 = P2V2, where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume.

In this problem, we are given the initial volume V1 = 2.0 L and pressure P1 = 760 torr. We are asked to find the final volume V2 at a pressure of P2 = 550 torr. Using Boyle's Law, we can set up the equation as: Substituting the given values, we get: (760 torr)(2.0 L) = (550 torr)(V2) Solving for V2, we get: V2 = (760 torr)(2.0 L) / (550 torr) = 2.76 L Therefore, the answer is E. 2.76 L. When the pressure of a gas changes, its volume also changes if the temperature is constant. The relationship between pressure and volume of a gas is described by Boyle's Law, which states that the pressure and volume of a gas are inversely proportional to each other. This means that if the pressure of a gas decreases, its volume increases proportionally, and vice versa.

Boyle's Law can be expressed mathematically as P1V1 = P2V2, where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume. In this problem, we are given the initial volume and pressure of a bag of chips and asked to find its volume at a different pressure. To solve this problem, we use Boyle's Law and the given values to find the final volume of the bag of chips. We substitute the given values into the equation and solve for the final volume. It is important to note that the units of pressure and volume must be consistent. In this problem, the pressure is given in torr and the volume is given in liters. Therefore, we need to convert the final volume to liters to match the given units.  Overall, this problem demonstrates the application of Boyle's Law to calculate the volume of a gas at a different pressure.

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The parameters that would be different for a reaction carried out in the presence of a catalyst compared to the same reaction carried out in the absence of a catalyst are: ΔH‡, Ea, and k.

When a catalyst is present in a chemical reaction, it provides an alternative pathway with lower activation energy (Ea) for the reaction to occur. This means that the catalyst lowers the energy barrier for the reaction, making it easier for the reactants to reach the transition state and form the products. Consequently, the activation energy (Ea) is reduced in the presence of a catalyst.

The enthalpy change of the transition state (ΔH‡) is also affected by the presence of a catalyst. Since the catalyst provides an alternative pathway, the transition state formed in the presence of the catalyst may have a different enthalpy compared to the transition state in the absence of a catalyst.

Additionally, the rate constant (k) of the reaction is influenced by the catalyst. The catalyst increases the rate of the reaction by providing an alternative reaction pathway with a lower activation energy. As a result, the rate constant (k) is generally higher when a catalyst is present.

Therefore, the parameters that differ for a reaction carried out in the presence of a catalyst compared to the absence of a catalyst are ΔH‡, Ea, and k.

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Answer:

A. 1350

You multiply 18.21HNO3* 1mol MgN2O6 * 148.30MgN2O6

Then divide it by the 2mol HNO3 to get 1350

The solubility of a sample will decrease when the size of the sample increases.

When the Size of sample is bigger, it means there is more particles that make up that sample so the amount of solvent to dissolve the sample will also be in the greater amount. Thus, when the sample size increases the solubility decrease. We can also say that size of sample and solubility are inversely proportional to each other.

We need a 0.62:1 ratio of dimethyl amine to dimethyl ammonium chloride to prepare a buffer solution with a pH of 10.43.

To prepare a buffer solution with a pH of 10.43 using dimethyl amine (CH3)2NH and dimethyl ammonium chloride ((CH3)2NH2Cl), you need to determine the required ratio of their concentrations. To do this, apply the Henderson-Hasselbalch equation:
pH = pKa + log([base]/[acid])
The pKa of dimethyl amine is 10.64. Now, solve the equation for the required ratio of base to acid:
10.43 = 10.64 + log([dimethyl amine]/[dimethyl ammonium chloride])
-0.21 = log([dimethyl amine]/[dimethyl ammonium chloride])
10(-0.21) = [dimethyl amine]/[dimethyl ammonium chloride]
0.62 ≈ [dimethyl amine]/[dimethyl ammonium chloride]

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Answer:

b,d,f

Explanation:your welcome give brainilest

Answer:

b,d,f

Explanation:

To determine whether a mixture is a buffer, we need to check if it consists of a weak acid and its conjugate base or a weak base and its conjugate acid.

Buffers are able to resist changes in pH when small amounts of acid or base are added to them.

Let's analyze each of the given mixtures:

a. KF / HF:

KF is a soluble salt, and HF is a weak acid. The presence of HF makes this mixture a buffer. The equilibrium equation for the conjugate acid/base pair is:

HF (weak acid) ⇌ H⁺ + F⁻ (conjugate base)

b. NH3 / NH4Br:

NH3 is a weak base, and NH4Br is a soluble salt. The presence of NH3 makes this mixture a buffer. The equilibrium equation for the conjugate acid/base pair is:

NH3 (weak base) + H₂O ⇌ NH4⁺ (conjugate acid) + OH⁻

c. KNO3 / HNO3:

KNO3 and HNO3 are both soluble salts. Neither of them is a weak acid or base, so this mixture is not a buffer.

d. Na2CO3 / NaHCO3:

Na2CO3 and NaHCO3 are both soluble salts. Neither of them is a weak acid or base, so this mixture is not a buffer.

In summary, the mixtures that are buffers are:

a. KF / HF

b. NH3 / NH4Br

For these buffers, I provided the equilibrium equations for the corresponding conjugate acid/base pairs.

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Answer:

nucleus as electrons are being added to the same principal energy level. These electrons are gradually pulled closer to the nucleus because of its increased positive charge. Since the force of attraction between nuclei and electrons increases, the size of the atoms decreases.

Explanation:

Nuclear attractive pull to the electrons results in smaller atomic radius. Two reasons that leads the size of an atom smaller by electron loss are nuclear pulling and emptying outermost orbital.

The nucleus have a net positive charge and electrons are negative in charge, thus, each electron experience a nuclear attractive pull. However, each electrons are shielded slightly from this attraction by the surrounding electrons.

The reasons which make the atomic radius smaller are the following.

Therefore, due the two reasons mentioned above, the atomic radius reduces by electron loss.

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To determine the molar concentration of each ion present in the solutions, we need to calculate the total moles of each ion and divide it by the total volume of the resulting solution.

(a) Mixture: 54.1 mL of 0.33 M NaCl and 76.0 mL of 1.33 M NaCl

For NaCl, the number of moles (n) can be calculated using the formula:

n = M * V

n(NaCl) = 0.33 M * 54.1 mL + 1.33 M * 76.0 mL

Next, we need to determine the concentration of each ion. Since NaCl dissociates into Na+ and Cl- ions in solution, the molar concentration of each ion is the same as that of NaCl.

M(Na+) = M(Cl-) = n(NaCl) / (V1 + V2)

Where V1 and V2 are the volumes of the solutions used.

M(Na+) = M(Cl-) = n(NaCl) / (54.1 mL + 76.0 mL)

(b) Mixture: 134 mL of 0.66 M HCl and 134 mL of 0.17 M HCl

Similarly, we calculate the moles of HCl:

n(HCl) = 0.66 M * 134 mL + 0.17 M * 134 mL

The concentration of each ion is the same as that of HCl:

M(H+) = M(Cl-) = n(HCl) / (V1 + V2)

Where V1 and V2 are the volumes of the solutions used.

M(H+) = M(Cl-) = n(HCl) / (134 mL + 134 mL)

(c) Mixture: 36.3 mL of 0.340 M Ba(NO3)2 and 25.5 mL of 0.211 M AgNO3

For Ba(NO3)2, we calculate the moles:

n(Ba(NO3)2) = 0.340 M * 36.3 mL

For AgNO3, we calculate the moles:

n(AgNO3) = 0.211 M * 25.5 mL

The concentration of each ion is determined as follows:

M(Ba2+) = n(Ba(NO3)2) / (V1 + V2)

M(Ag+) = n(AgNO3) / (V1 + V2)

M(NO3-) = 2 * M(Ba2+) + M(Ag+)

Where V1 and V2 are the volumes of the solutions used.

M(Ba2+) = n(Ba(NO3)2) / (36.3 mL + 25.5 mL)

M(Ag+) = n(AgNO3) / (36.3 mL + 25.5 mL)

M(NO3-) = 2 * M(Ba2+) + M(Ag+)

(d) Mixture: 13.6 mL of 0.650 M NaCl and 22.0 mL of 0.131 M Ca(C2H3O2)2

For NaCl, we calculate the moles:

n(NaCl) = 0.650 M * 13.6 mL

For Ca(C2H3O2)2, we calculate the moles:

n(Ca(C2H3O2)2) = 0.131 M * 22.0 mL

The concentration of each ion is determined as follows:

M(Na+) = n(NaCl) / (V1 + V2)

M(Cl-) = n(NaCl)

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Answer:

pOH = 10.16

Explanation:

pOH is a measurement in chemistry that could be obtained with the equation:

pOH = 14 - pH

The mathematical definition of the pOH is:

pOH = -log [OH⁻]

If the pH of the solution is 3.84, the pOH is:

pOH = 14 - 3.84

Answer:

10.25

Explanation:

Got it correct!

The list that gives the correct symbols for the elements phosphorus, potassium, silver, chlorine, and sulfur in that order is P, K, Ag, Cl, S (option D).

Chemical symbol is the 1- to 3-letter international code for a chemical element.

Element symbols for chemical elements normally consist of one or two letters from the Latin alphabet and are written with the first letter capitalised.

According to this question, five elements are given. The chemical symbols of each element is as follows;

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Answer: Chromium is both an element and a compound

Explanation:

Answer:

100 times more acidic.

Explanation:

If you look at the pH scale, pH2 is 2 "jumps" away from pH4, therefore, pH2 is 100x more acidic than pH4.

Answer:

C, hexanal

Explanation:

Option C is correct. The given name of the aldehyde CH3CH2CH2CH2CH2CHO is Hexanal

Aldehydes are organic compounds formed from the oxidation of alcohols. The contains the group -CHO

Given the compound CH3CH2CH2CH2CH2CHO

For us to name this compound, we need to first know:

Since there are 6 carbons in the chain, hence the alkane equivalent will be hexane.

Since it is an aldehyde compound.

General naming = alkane name + group name of aldehyde

compound name = alkane name + (-nal)

compound name = hexanal

Hence the name of the given aldehyde is Hexanal

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The ability of an atom to attract electrons is known as electronegativity.

The electronegativity is the measure of an atom's ability to attract electrons towards itself when it forms a chemical bond with another atom.  The electronegativity of an atom increases from left to right in a period and decreases from top to bottom in a group.

Electronegativity is a chemical property of an atom that describes the atom's ability to attract electrons towards itself when it combines with another atom. The electronegativity of an atom can be defined as its tendency to attract shared electrons in a chemical bond. The electronegativity of an atom is affected by its atomic number, the number of protons it has, and the distance between the nucleus and the electrons. Electronegativity of elements : Electronegativity increases from left to right across a period of the periodic table. This is because the number of protons in the nucleus increases across the period , and the electrons are closer to the nucleus. As a result, the atom has a stronger attractive force for electrons . Electronegativity decreases as we move down a group in the periodic table. This is because the atomic size increases down the group , and the distance between the nucleus and the electrons increases. As a result, the attractive force for electrons decreases.

American scientist Linus Pauling developed a set of dimensionless variables known as electronegativity values that vary from a little under one for alkali metals to a maximum of four for fluorine. In comparison to lower electronegativity values, large electronegativity values show a higher attraction for electrons.

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The mass percent of the solution is approximately 10.51%.

To calculate the mass percent of the solution, we need to determine the total mass of the solution.

The mass of the solution can be calculated using the density and volume of the solution:

Mass of the solution = Density × Volume

Mass of the solution = 1.06 g/ml × 895 ml

Mass of the solution = 948.7 g

The mass percent of the solution can be calculated by dividing the mass of the solute (CSI) by the mass of the solution and multiplying by 100:

Mass percent = (Mass of CSI / Mass of the solution) × 100

Mass percent = (99.7 g / 948.7 g) × 100

Mass percent ≈ 10.51%

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Answer:

About 2 liters

Explanation:

Since 1 gallon equals 3.785 liters, you figure out how many liters per week she uses by 3.785 x 0.75 which is 2.83875. Then divide that by 7 which is 0.405535 liters per day. Then multiply that by 5 days which is 2.027 liters in 5 days.

In the synthesis reaction, b)6.2 grams of magnesium were there in the crucible before heating?

B. To find the amount of magnesium that was in the crucible before heating, we need to calculate the mass of magnesium from the amount of aluminum oxide that was in the crucible.

The reaction is: Mg + Al2O3 → MgO + Al.

First, the mass of aluminum oxide needs to be determined. To do this, we need to use the molar mass of aluminum oxide, which is 101.96 g/mol. Since the reaction was a 1:1 ratio of magnesium to aluminum oxide, the mass of aluminum oxide is also 6.2 g.

Since the reaction is 1:1, the mass of magnesium must also be 6.2 g. Therefore, the answer is b. 6.2 g.

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The key differences between pneumatic and hydraulic systems are:

The fluid used: Pneumatic systems use air as the fluid, while hydraulic systems use a liquid such as oil.

The transmission of power: In pneumatic systems, power is transmitted through the movement of air, while in hydraulic systems, power is transmitted through the movement of a pressurized liquid.

The types of forces involved: Pneumatic systems typically involve forces that are relatively low in magnitude but high in speed, while hydraulic systems involve forces that are high in magnitude but low in speed.

Pascal's Law states that the pressure applied to a confined fluid is transmitted undiminished in all directions and acts with equal force on equal areas. An example of a household item that applies Pascal's Law is a hydraulic jack, which uses a confined fluid (usually oil) to transmit pressure and lift heavy objects. When the handle of the jack is pressed down, the pressure of the fluid is increased and transmitted through the system, causing the lift arm to rise.

Advantages of pneumatic systems:

They are relatively simple and easy to maintain.

They are energy efficient, as air is a readily available and inexpensive fluid.

They are safe to use, as there is no risk of explosions or fires.

Disadvantages of pneumatic systems:

They are limited in their power transmission capabilities, as the forces generated by pneumatic systems are typically lower than those generated by hydraulic systems.

They are not suitable for use in high-pressure or high-temperature applications.

They are prone to leakage, as air can escape through small openings.

Examples of pneumatic systems:

Air compressors

Pneumatic tools such as hammers and drills

Automatic doors in buildings

Advantages of hydraulic systems:

They can transmit large amounts of power with relatively small amounts of force.

They are able to generate high pressures, making them suitable for use in a wide range of applications.

They are relatively simple and easy to maintain.

Disadvantages of hydraulic systems:

They require a separate power source to operate, such as an electric motor or gasoline engine.

They can be expensive to repair if they fail or leak.

They can be hazardous to use, as the fluid used (usually oil) is flammable and can cause burns or fires.

Examples of hydraulic systems:

Hydraulic lifts in automotive garages

Hydraulic jacks and presses

Hydraulic brakes in vehicles

Excavators and bulldozers

When the flashlight is turned on and the lights are turned off, the white paper on the wall will appear bright as it reflects the light from the flashlight. However, when a clear plastic is placed in front of the flashlight, the light hitting the white paper on the wall will be affected.

The clear plastic acts as a lens, which changes the direction and intensity of the light passing through it. As the light passes through the plastic, it refracts or bends, causing the beam of light to spread out or focus. This results in a change in the shape and size of the light beam hitting the white paper on the wall.

The effect of the plastic on the light hitting the paper will depend on the shape and thickness of the plastic, as well as its distance from the flashlight. In general, the plastic will cause the light beam to spread out or focus differently, resulting in a change in the appearance of the light hitting the paper on the wall.

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Answer:

China, Mongolia, Russia, and North Korea. They were told to fly at 1400 meters but they flew at 1500 feet making them crash.

Explanation:

Explanation:

4Al+3C+H2O→4Al(OH)3+3CH4

Balanced reaction:- 4Al+3C+HH O→4Al(OH)3+3CH4