Which of the following represent a chemical compound? a. Cr b. CO c. Au d. Mg

Answer:

Mechanical advantage is a measure of the force of amplification achieved by using a tool, mechanical device or machine system. I hope this helps!

Answer:

the ratio of the force produced by a machine to the force applied to it, used in assessing the performance of a machine.

Explanation:

i hope u understand :)

The new pressure of the gas after expanding to a volume of 54 L is 0.063 atm.

What is new pressure?

The pressure of a gas is the force that the gas exerts on the walls of its container per unit of area. It is a measure of the force that gas molecules exert on the walls of a container as they collide with it. The pressure of a gas is directly proportional to the number of gas molecules in the container and their average kinetic energy.

We can use Boyle's Law to solve this problem, which states that the pressure of a gas is inversely proportional to its volume, as long as the temperature and number of moles of gas remain constant. Mathematically, Boyle's Law can be written as:

P1V1 = P2V2

where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume.

We can rearrange this equation to solve for P2:

P2 = P1V1/V2

Substituting the given values, we get:

P1 = 0.86 atm

V1 = 3.92 L

V2 = 54 L

P2 = 0.86 atm × 3.92 L / 54 L

P2 = 0.06285185 atm

Rounding this value to the thousandths place, we get:

P2 = 0.063 atm

Therefore, the new pressure of the gas after expanding to a volume of 54 L is 0.063 atm.

Boyle's Law is named after Robert Boyle, an Irish scientist who studied the properties of gases in the 17th century. The law is important in many areas of science and engineering, including the design of engines, the behavior of atmospheric gases, and the production of gases for industrial applications.

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Complete question is: A gas with a volume of 3.92 L at a pressure of 0.86 atm is allowed to expand until the volume raises to 54 L. Its new pressure will be 0.063 atm.

Answer:

A. AgNO3

I hope it's helps

Answer:

The mass of a sample of iron that has had 300 J applied to it and heats up from 20 degrees Celsius to 40 degrees Celsius is 32.61 grams.

Explanation:

Calorimetry is the measurement and calculation of the measurement of heat changes exchanged by a body or a system produced in physical and chemical processes.

The sensible heat of a body is the amount of heat received or transferred by a body to produce a change in temperature but without a change in physical state.

The sensible heat in a constant pressure is calculated by:

Q = c * m * ΔT

where Q is the heat exchanged by a body of mass m, constituted by a substance of specific heat c, and where ΔT is the temperature variation (ΔT=Tfinal - Tinitial)

In this case:

Replacing:

300 J= 0.46 \(\frac{J}{g*C}\) * m* (40 - 20) C

Solving:

300 J= 0.46 \(\frac{J}{g*C}\) * m* 20 C

\(m=\frac{300 J}{0.46 \frac{J}{g*C} * 20 C}\)

m= 32.61 g

Answer:

6.45 g of iodine, I₂

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

Zn + I₂ —> ZnI₂

Next, we shall determine the mass of Zn and I₂ that reacted from the balanced equation. This can be obtained as follow:

Molar mass of Zn = 65 g/mol

Mass of Zn from the balanced equation = 1 × 65 = 65 g

Molar mass of I₂ = 127 × 2 = 254 g/mol

Mass of I₂ from the balanced equation = 1 × 254 = 254 g

SUMMARY:

From the balanced equation above,

65 g of Zn reacted with 254g of I₂.

Finally, we shall determine the mass of f I₂ needed to react with 1.65 g of Zn. This can be obtained as follow:

From the balanced equation above,

65 g of Zn reacted with 254g of I₂.

Therefore, 1.65 g of Zn will react with = (1.65 × 254)/65 = 6.45 g of I₂.

Thus, 6.45 g of iodine, I₂ is needed for the reaction.

Elements are made of only one kind of atom. The molecule is made up of two or more kinds of atoms. There is no physical change that can separate the compounds into more than one kind of substance. This makes a compound a pure substance.

Answer:

Elements are made of only one kind of atom. ... The molecule is made up of two or more kinds of atoms. There is no physical change that can separate the compounds into more than one kind of substance. This makes a compound a pure substance.

Explanation:

Answer:

i think it is..... smaller than normal range of highs and low tides  

Moon and Sun are at right angles to the Earth

Explanation:

Moon and Sun are at right angles to the Earth and gravity of the Sun and Moon work against is the right statement about NEAP tides.

Tides are the cyclic deformation of water body occur due to external gravitational force.

NEAP tides are also known as small tides as their heights are not very much and this is occur due to opposite attraction of water towards the gravity of the sun and moon. As sun and moon are present in the right angle direction with respect to the earth.

Hence, option (1) & (2) is correct, i.e. gravity of sun and moon is opposite and they are present at the right angle to the earth.

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  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:

Be Electron configuration: 1s2 2s2

Be Orbital Diagram: \//\    \//\ (it would be little arrows going up and down to show the spins)

F Electron Configuration: 1s2 2s2 2p5

F Orbital Diagram: \//\    \//\    \//\ \//\ \/

The molarity of the solution is 0.26 M (molar).

To calculate the molarity of a solution, we need to know the moles of solute and the volume of the solution in liters. Given that 3.5 grams of CuCl\(_{2}\) (copper(II) chloride) is dissolved in 100 mL (0.1 L) of water, we can convert the mass of CuCl\(_{2}\) to moles using its molar mass. The molar mass of CuCl\(_{2}\) is approximately 134.45 g/mol.

Using the formula

Moles = Mass / Molar Mass,  

We find that the moles of CuCl\(_{2}\) is 0.026 moles.

Now, we can calculate the molarity by dividing the moles of CuCl\(_{2}\) by the volume of the solution in liters.

Therefore, the molarity of the solution is 0.026 moles / 0.1 L = 0.26 M.

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Answer:

I hope that's what u were lookong for :))

Explanation:

Explanation:

The covering of much of the Sahara desert by grasses, trees and lakes was caused bychanges in Earth's orbit around the Sun;changes in vegetation and dust in the Saharawhich strengthened the African monsoon; and increased greenhouse gases, which may imply that anthropogenic global warming could result in a shrinkage ...

Answer:

global warming ,.....

The balanced chemical equation for the reaction between quicklime (calcium oxide, CaO) and water (H2O) is as follows:

CaO + H2O → Ca(OH)2

This equation represents a classic example of an acid-base reaction, in which the calcium oxide, which is a basic oxide, reacts with water, a proton donor, to form calcium hydroxide, a strong base. The reaction is exothermic and releases a significant amount of heat, making it useful for various industrial applications, such as in cement production and as a desiccant.

Calcium hydroxide, also known as slaked lime, is a white crystalline solid that is sparingly soluble in water and has many applications in agriculture, construction, and environmental remediation.

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Among the options listed, water is the base.

A base is a substance that has a high pH and can accept protons or donate hydroxide ions (OH-) in a chemical reaction. Water fits this definition as it has a neutral pH of 7, making it neither an acid nor a base. However, water can act as a base by accepting protons from strong acids to form hydronium ions (H3O+).On the other hand, hand soap is typically formulated to be slightly acidic, around pH 5.5 to 6.5, to match the skin's natural acidity. Gastric juices, such as stomach acid, are highly acidic with a pH ranging from 1 to 3, necessary for digestion.

Orange juice is also acidic, typically having a pH range of 3 to 4.5, due to the presence of citric acid.While water can exhibit both acidic and basic properties depending on the context, it is considered neutral in its pure form with a pH of 7. It can act as a base when reacting with stronger acids. Water's ability to dissociate into hydronium and hydroxide ions makes it amphoteric, meaning it can behave as both an acid and a base.

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Among the options provided, water (H2O) is considered a base.

According to the Bronsted-Lowry hypothesis, which categorizes bases as proton acceptors and acids as proton donors, water can function as a base by taking a proton to form the hydroxide ion (OH-), which is an anion. Pure water has a limited amount of water molecules that dissociate to form H+ and OH- ions, which creates a mildly basic solution.

Therefore, In some situations, water may be regarded as a base.

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751 g of benzene to be added to 5.00 moles of carbon tetrachloride to reduce its vapor pressure by 10%.

We can use Raoult's law to solve this problem. According to Raoult's law, the vapor pressure of a solution is given by:

P = X P₁⁰ + X₂ P₂⁰

where P is the vapor pressure of the solution, X₁ and X₂ are the mole fractions of the two components, and P₁⁰ and P₂⁰ are the vapor pressures of the pure components.

If we assume that benzene is the solute and carbon tetrachloride is the solvent, then the vapor pressure of the solution will be:

P = X₁  P₁⁰ + X₂ P₂⁰

P = (moles of benzene / total moles) P₁⁰ + (moles of CCl4 / total moles) P₂⁰

P = (n / (n + 5))  P₁⁰ + (5 / (n + 5)) P₂⁰

where n is the number of moles of benzene.

We know that the vapor pressure of carbon tetrachloride is reduced by 10%, so we can write:

0.9 P₂⁰ = (n / (n + 5))  P₁⁰  + (5 / (n + 5)) P₂⁰

Solving for n, we get:

n = 9.63 moles

Therefore, we need 9.63 moles of benzene to reduce the vapor pressure of carbon tetrachloride by 10%. The mass of benzene required can be calculated as:

mass = moles x molar mass = 9.63 mol x 78.1 g/mol = 751 g

Therefore, we need 751 g of benzene to be added to 5.00 moles of carbon tetrachloride to reduce its vapor pressure by 10%.

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Answer: C

Explanation:

Answer:

1.1 × 10²⁴ atoms Mg

General Formulas and Concepts:

Atomic Structure

Stoichiometry

Explanation:

Step 1: Define

Identify

[Given] 1.8 mol Mg

[Solve] atoms Mg

Step 2: Identify Conversions

Avogadro's Number

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 2 sig figs.

1.08396 × 10²⁴ atoms Mg ≈ 1.1 × 10²⁴ atoms Mg

Answer:  1.0836 * 10^24 atoms

This value is approximate

===========================================================

Explanation:

1 mole = 6.02*10^23 atoms approximately

This applies to any element.

Multiply both sides by 1.8 and we get...

1 mole = 6.02*10^23 atoms

1.8*1 mole = 1.8*6.02*10^23 atoms

1.8 mole = 10.836*10^23 atoms

1.8 mole = (1.0836*10)*10^23 atoms

1.8 mole = 1.0836 * 10^(1+23)

1.8 mole = 1.0836 * 10^24 atoms

Answer:

B

Explanation:

NaNO3 and H2O

(double replacement reaction)

The response is C. 400mL of 5% glucose solution requires 20g of glucose to make.

To prepare 400mL of 5% glucose solution, we need to determine the amount of glucose required.

5% glucose solution means that 5g of glucose is present in 100mL of the solution.

Therefore, for 400mL of the solution, the amount of glucose required can be calculated as:

5g glucose/100mL solution = x g glucose / 400mL solution

x = (5g glucose/100mL solution) x (400mL solution) = 20g glucose

Therefore, the answer is D. 20g of glucose is needed to prepare 400mL of 5% glucose solution.

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Answer:

there are 4 sulfur atom.

Explanation:

Plastic takes time to degrade which means it has great longevity. Plastic does not break as easily as glass or other materials. It lasts long and offers great service. Plastic storage containers offer greater flexibility than any other packaging materials.

Answer:

The thermal energy (heat) needed, to raise the temperature of oil of mass  'm' kilogram and specific heat capacity 'c' from 20°C to 180°C  is  160·m·c joules

Explanation:

The heat capacity, 'C', of a substance is the heat change, ΔQ, required by a given mass, 'm', of the substance to produce a unit temperature change, ΔT

∴ C = ΔQ/ΔT

ΔQ = C × ΔT

C = m × c

Where;

c = The specific heat capacity

ΔT = The temperature change = T₂ - T₁

∴ ΔQ = m × c × ΔT

Therefore, the thermal energy (heat) needed, ΔQ, to raise the temperature of oil of mass 'm' kilogram and specific heat capacity, 'c' from 20°C to 180°C  is given as follows;

ΔQ = m × c × (180° - 20°) = 160° × m·c

ΔQ = 160·m·c joules

Answer:

For the first one I think it is:

2)Cell 5)tissue 3)organ 1)organism 4)body/organ system

I also think the second question is B

5) Convert molarity to percent, calculate moles of acetic acid, convert moles to grams, divide grams by volume in mL, multiply by 100 to obtain experimental percent, and calculate percent error.

6) Phenolphthalein could have been used as an alternative indicator.

7) When using barium hydroxide instead of sodium hydroxide, adjust the calculations by considering the stoichiometry of the reaction and using a molar ratio of 2:1 between acetic acid and barium hydroxide.

5. To calculate the percent error in the concentration of acetic acid, we need to convert our molarity (M) results to percent (%). Using the average molarity and the average volume (converted to liters) of acetic acid, we can calculate the number of moles of acetic acid.

Then, by converting moles to grams using the molar mass of acetic acid (CH3COOH), we can divide the grams of acetic acid by the average volume (in milliliters) of acetic acid and multiply by 100 to obtain the experimental percent.

Finally, we can calculate the percent error by comparing the experimental percent to the labeled percent (4% vinegar on the bottle).

6. An alternative indicator that could have been used is phenolphthalein. Phenolphthalein is commonly used in acid-base titrations and changes color in a specific pH range, indicating the endpoint of the reaction.

6. If barium hydroxide (Ba(OH)2) were used instead of sodium hydroxide (NaOH), the adjustment in calculations would involve the stoichiometry of the reaction. The balanced chemical equation for the reaction between acetic acid and barium hydroxide is:

2CH3COOH + Ba(OH)2 → Ba(CH3COO)2 + 2H2O

The molar ratio between acetic acid and barium hydroxide is 2:1. Therefore, the number of moles of barium hydroxide used would be half the number of moles of acetic acid in the calculation.

The rest of the procedure, including converting moles to grams and calculating the percent, would remain the same.

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Answer:

-

Explanation:

As the piece of metal skitters across the surface of the water in a beaker and — particularly in the case of potassium — it appears to catch fire, it is not obvious that the explanation for both phenomena lies in the production of hydrogen gas.

You have prepared a 1.0 M solution of \(CaCl2\) in the laboratory the concentration of chloride ions in the solution is 1.5 M.

Solution is defined as huge amount of solute dissolved in solvent. The proportion of solute is limited and after reaching at the point of saturation no more solute will be mixed in the solvent. It is impossible to separate solvent and solute from eye.

Pressure plays a important role in rate of reaction to increase the pressure it increases the rate of reaction by increasing the collision.

Pressure increase the concentration of gases it means that it increases the number of molecules per unit volume due to this collision of gases increases this will increase the temperature. This increase of  temperature will increase the rate of reaction.

Therefore, you have prepared a 1.0 M solution of CaCl2 in the laboratory the concentration of chloride ions in the solution is 1.5 M.

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The kinetic molecular theory (KMT) is a model used to explain the behavior of gases based on the motion of their individual particles.

Let's analyze the given statements and determine which ones are not consistent with KMT:

1. "Gases consist of small particles called molecules or atoms that are in constant motion." - This statement is consistent with KMT. According to the theory, gases are made up of small particles (atoms or molecules) that are constantly moving and colliding with each other and the walls of their container.

2. "Gas particles are always attracted to each other." - This statement is not consistent with KMT. The theory assumes that gas particles have negligible attractive forces between them. Instead, it states that they only interact through collisions.

3. "Gas particles have definite shapes and volumes." - This statement is not consistent with KMT. According to KMT, gas particles do not have definite shapes or volumes. They take on the shape and volume of their container, as they are highly compressible and can fill the available space.

4. "The average kinetic energy of gas particles is directly proportional to their temperature." - This statement is consistent with KMT. KMT states that the average kinetic energy of gas particles is directly proportional to their temperature. As the temperature increases, the particles move faster and have higher kinetic energy.

In summary, the statements that are not consistent with KMT are:
2. "Gas particles are always attracted to each other."
3. "Gas particles have definite shapes and volumes."

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Answer:

literally same im failing almost every class and i just know my dad hates me because of it

Explanation:

Answer: Plate movement is thought to be driven by a combination of the motion of the seafloor away from spreading ridges due to variations in topography and density changes in the crust.

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