Which best compares a molecule that has a trigonal planar shape with one that has a trigonal pyramidal shape?
O They both contain three lone pairs of electrons around the central atom.
O They both contain three atoms around the central atom.
O The central atom of the trigonal planar molecule has two lone pairs around it, but the central atom of the trigonal
pyramidal molecule has only one.
O The central atom of the trigonal planar molecule has two atoms around it, but the central atom of the trigonal
pyramidal molecule has only one.

Answer:

Salt

Explanation:

salt particles make it harder for water particles to freeze back onto the ice

ice that is in contact with dissolved salt melts faster

1.000 mole of water decomposes to yield 0.500 mol of oxygen gas.

When water (H₂O) decomposes, it produces hydrogen gas (H₂) and oxygen gas (O₂). The balanced chemical equation for this process is:

2 H₂O → 2 H₂ + O₂

From the equation, we can see that 2 moles of water decompose to yield 1 mole of oxygen gas. To find out how many moles of water are needed to yield 0.500 mol of oxygen gas, you can use the stoichiometry ratio:

(2 moles H₂O) / (1 mole O₂) = (x moles H₂O) / (0.500 mol O₂)

To solve for x, simply multiply both sides by 0.500 mol O₂:

x moles H₂O = (2 moles H₂O) × (0.500 mol O₂)

x = 1.000 mol of water

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Answer:

Star 1 and two. Good on exams I'm doing mine two

Answer:star 1 and 2

Explanation:

Answer:

2.32 liters

Explanation:

you would just divide 24 by 3 which is 8 and multiply 290 by it which is 2320 and divide by 1000 which is 2.32

The quantity of milk that will the lamb give in 24 hours is 2.32 Liter.

Lamb may be defined as the youngest form of sheep. In other words, it may be characterized as the little offspring produced by a sheep.

According to the question,

The amount of milk given by lamb in three hours = 290 milliliters.

∴ The amount of milk given by lamb in one hour = 96.66 milliliters.

Now, the amount of milk given by a lamb in 24 hours = 24 × 96.66 = 2320 milliliters.

Now, as per the requirement of the question, convert milliliter into liter.

One liter = 1000 milliliters.

∴2320 milliliters = 2320/1000 = 2.32 liters.

Therefore, the quantity of milk that will the lamb give in 24 hours is 2.32 Liter.

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Answer:

The answer is Conduction.

Answer:

Catalysts play a significant role in transesterification of vegetable oils. ... Eggshell has a large amount of calcium carbonate that can be ...

‎Abstract · ‎Introduction · ‎Catalysis in transesterification · ‎Conclusion and prospects

Explanation:

The industrial production of biodiesel is catalyzed by calcium carbonate catalyst which increases the rate of reaction many folds. The cost of catalyzed reaction decreases as activation energy decreases.

Catalyst is a substance that enhance the rate of any chemical reaction without participating in the chemical reaction. Catalyst generally increases the rate of reaction by lowering the activation energy of that chemical reaction.

Biodiesel is formed by reaction of vegetable oil. For the conversion of vegetable oil to biodiesel oil we use calcium carbonate as catalyst.

As we said earlier that catalyst reduces activation energy that means requires less energy for conversion. So we need lower cost to provider lower energy. Hence use of catalyst reduces costs.

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The molal concentration of the HNO3 solution is approximately 3070.43 mol/kg.

To calculate the molal concentration (molality) of the HNO3 solution, we need to determine the moles of solute (HNO3) and the mass of the solvent (water). Molality is defined as the moles of solute per kilogram of solvent.

Given information:

Molarity of HNO3 solution (M) = 3.539 mol/L

Density of HNO3 solution (D) = 1.150 g/mL

Molar mass of HNO3 (MM) = 63.02 g/mol

Step 1: Convert the density of the solution to grams per liter (g/L).

Density (D) = 1.150 g/mL

Since 1 mL = 0.001 L, we can multiply the density by 0.001 to convert it to g/L.

Density (D) = 1.150 g/mL * 0.001 L/mL = 0.001150 g/L

Step 2: Calculate the moles of HNO3 in the solution.

Moles of HNO3 = Molarity (M) * Volume (V)

Moles of HNO3 = 3.539 mol/L * 1 L = 3.539 mol

Step 3: Calculate the mass of the solvent (water) in kilograms.

Mass of solvent = Density (D) * Volume (V)

Mass of solvent = 0.001150 g/L * 1000 L = 1.150 g

Since 1 kg = 1000 g, the mass of the solvent in kilograms is 1.150 g / 1000 g/kg = 0.00115 kg.

Step 4: Calculate the molality (molal concentration) of the HNO3 solution.

Molality (m) = Moles of solute / Mass of solvent (in kg)

Molality (m) = 3.539 mol / 0.00115 kg = 3070.43 mol/kg

Therefore, the molal concentration of the HNO3 solution is approximately 3070.43 mol/kg.

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Answer:

1.68 atm

Explanation:

First we must obtain the number of moles of the oxygen = 32.7g/32 g/mol = 1.02 moles of oxygen

V= 15.0 L

T= 302 K

R = 0.082 atmLmol-1K-1

From the ideal gas equation;

PV=nRT

P= nRT/V

P= 1.02 *  0.082 * 302/15.0

P= 1.68 atm

Given :

A gas with a volume of 2 L at 25°C is placed into a container that is 4 L.

To Find :

The new temperature of the gas.

Solution :

Since, their is no information regarding pressure. We will assume that pressure is constant.

Now, we know when at constant pressure, volume is directly proportional to volume.

\(\dfrac{V_1}{V_2}=\dfrac{T_1}{T_2}\\\\\dfrac{2}{4} = \dfrac{25 + 273 }{x}\\\\x = 2 \times ( 25 + 273 )\\\\x = 596\ K\)

Therefore, the new temperature of the gas is 596 - 273 K = 323  K.

Explanation:

One of the most fascinating chemical experiments is the reaction between silver nitrate and copper wire in water. Characterised by fractal-like precipitates, this experiment is a stunning example of a simple redox reaction.

Copper reacting with silver nitrate is a chemical change. In a chemical change, new substances are formed with different chemical properties.

Copper (Cu) is a metal, and silver nitrate is a compound made of silver (Ag), nitrogen (N), and oxygen (O).When copper is added to silver nitrate, a reaction occurs. The copper atoms react with the silver nitrate molecules, resulting in the formation of new substances.

The reaction produces copper nitrate  and silver (Ag) as products.Copper nitrate is a compound formed by the combination of copper, nitrogen, and oxygen, while silver remains unchanged.

The color of the solution changes, indicating a chemical reaction has taken place. Copper nitrate is usually a blue-green color, while silver is a metallic silver color.The chemical properties of the substances involved in the reaction are altered. Copper, being a metal, is malleable and conducts electricity, whereas copper nitrate is a compound and does not possess these properties.

Thus, the reaction between copper and silver nitrate is a chemical change because new substances with different properties are formed.

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The volume of water that must be add is 20 mL. Volume of water that must add is new volume after dilution minus initial volume.

As per data given:

Initial volume (V1) = 40 mL = 0.040 L

Initial molarity(C1) = 9.0 M

New molarity (C2)= 6.0 M

As we want to know to the new volume of water(V2). We have to use dilution formula where the formula is C1 x V1 = C2 x V2. So, the calculation would be:

9.0 x 0.040 = 6.0 x V2

V2 = 0.06 L

V2 = 60 mL

Since the addition water is the difference between V2 and V1:

Volume add = V2 -V1

Volume add = 60 - 40

Volume add = 20 mL

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Answer:

in copper from different plastics because appliances of codes to power day in wire copper the cover to use to plastic

Answer:

A. Metals

Explanation:

The procedural error that could cause an abnormally high % recovery is the presence of additional impurities in the collected crystals.

An abnormally high % recovery of 120% suggests that there is an error in the experimental procedure. In a recrystallization process, the goal is to purify a solid compound by dissolving it in a suitable solvent (in this case, water) and then allowing it to recrystallize as the solution cools. The impurities should remain dissolved in the solvent and not be incorporated into the growing crystals.

However, if there are additional impurities present in the collected crystals, it would lead to a higher mass than expected, resulting in an inflated % recovery. This could occur due to various reasons. For instance, the filter paper used for vacuum filtration might not be fine enough to effectively capture all the impurities, allowing some to pass through and contaminate the collected crystals. Another possibility is that the crystals were not thoroughly washed with a suitable solvent after filtration, which could leave behind impurities on the crystal surface.

To ensure accurate % recovery, it is crucial to use appropriate filtration techniques and thoroughly wash the crystals to remove any remaining impurities. Additionally, it is important to consider other factors that could contribute to the inflated % recovery, such as experimental errors in measuring the initial mass of the compound or miscalculations in the final mass determination.

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At 218 °C, solid NH₄SH decomposes to form 0.011 M NH₃ and H₂S, as given by its equilibrium constant.

The equilibrium constant (Keq) is the ratio of the product of the concentrations of the products to the product of the concentrations of the reactants, all raised to their stoichiometric coefficients.

Only gases and aqueous species are included.

        NH₄SH(s) ⇋ NH₃(g) + H₂S(g)

I                                 0           0

C                               +x          +x

E                                x            x

Keq = 1.2 × 10⁻⁴ = [NH₃] [H₂S] = x²

x = 0.011 M

At 218 °C, solid NH₄SH decomposes to form 0.011 M NH₃ and H₂S, as given by its equilibrium constant.

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Answer:

c. Waxing crescent

- I hope this helps have a great night

When a component is removed from a reaction system at equilibrium, the equilibrium system will shift to replace some of what was removed.

It states that when a reaction is in equilibrium and one of the factors that affect the rate of reactions is applied, the equilibrium will shift to neutralize the effects of the constraint.

Every equilibrium system obeys Catelier's principle.

Thus, removing one of the components in a reaction that is in equilibrium will make the equilibrium shift to create more of the component being removed.

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Answer:

D : The equilibrium system will shift to replace some of what was removed.

Explanation:

The number of mols of oxygen used in this reaction is 0.5 mols of O\(_2\). The empirical formula of magnesium oxide will contain one Magnesium atoms to one oxygen atoms.

To keep the body's magnesium levels balanced, magnesium oxide is taken as a supplement. Additionally, magnesium oxide is employed as a laxative to treat occasional constipation as well as an antacid to cure indigestion.

A student works with a crucible weighing 35.100 g. He obtains a piece of magnesium and adds it to the crucible and weights it to obtain a new weight of 35.153 g. The student burns the magnesium with excess oxygen. The new mass is 35.162. The number of mols of oxygen used in this reaction is 0.5 mols of O\(_2\). The empirical formula of magnesium oxide will contain one Magnesium atoms to one oxygen atoms.

Therefore, the empirical formula of magnesium oxide will contain one Magnesium atoms to one oxygen atoms.

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Answer:

3.3

Explanation:

the heat is hit and the hot is cold.so thats why

Determining whether a functional group is acidic or basic depends on its ability to either donate or accept a proton (H+). Here are some general guidelines to help you assess the acidity or basicity of a functional group:

1. Acidity:

  a. Look for functional groups that have an acidic hydrogen directly bonded to an electronegative atom, such as oxygen or a halogen. Examples include carboxylic acids (–COOH) and phenols (–OH on an aromatic ring).

  b. Consider the stability of the resulting conjugate base. If the conjugate base is stabilized through resonance or delocalization of the negative charge, the functional group is more acidic. For example, the carboxylate ion (–COO-) is stabilized through resonance.

2. Basicity:

  a. Look for functional groups that contain lone pairs of electrons, which can readily accept a proton. Common examples include amines (–NH2) and amides (–CONH2).

  b. Consider the availability of lone pairs. The more accessible the lone pairs are, the more basic the functional group. For example, primary amines have more available lone pairs than tertiary amines and are, therefore, more basic.

It's important to note that the acidity or basicity of a functional group can also be influenced by its environment, neighboring groups, and other factors. These guidelines provide a general starting point, but there may be exceptions and variations based on specific compounds and circumstances.

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A 100 mL of 0.2 M KCl solution is added to 500 mL of water, and the concentration of the resulting solution is 0.04 M KCl. We must calculate the concentration of the resulting solution that contains a 100 mL of 0.2 M KCl and 500 mL of water.

We may start by calculating the number of moles of KCl in 100 mL of 0.2 M KCl solution:$$\text{No. of moles of KCl}=\text{Molarity}\times\text{Volume (in L)}$$Molarity = 0.2 MVolume (in L) = 100/1000 L (1 L = 1000 mL)No. of moles of KCl = 0.2 x 100/1000 = 0.02 molesWe now have to calculate the number of moles of KCl in the final solution.

As a result, we'll use the formula:$$\text{Molarity}=\frac{\text{No. of moles of solute}}{\text{Volume of solution}}$$No. of moles of solute = 0.02 molVolume of solution = 500 + 100 = 600 mL= 0.6 L$\text{Molarity}=\frac{\text{No. of moles of solute}}{\text{Volume of solution}}$$\text{Molarity}=\frac{0.02 \text{mol}}{0.6 \text{L}}=0.04 \text{M}$$Therefore, the concentration of the resulting solution is 0.04 M KCl.

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The concentration of the resulting solution is 0.0333 M.

To find the concentration of the resulting solution, we can use the formula:

Where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume.

In this case, the initial concentration is 0.2 M, the initial volume is 100 ml, and the final volume is the sum of the initial volume and the volume of water, which is 100 ml + 500 ml = 600 ml.

Now we can plug in the values into the formula and solve for C2:

C1V1 = C2V2

(0.2 M)(100 ml) = C2(600 ml)

20 = C2(600)

C2 = 20/600

C2 = 0.0333 M

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Answer:

Earth

Explanation:

The Earth and the sun are the part of the solar system and the earth and other planets revolve around the Sun. The solar system is placed in the universe.

Answer:

False

Explanation:

They are not the same color since they do not all have the same temperature

Temperature defines their color

The height of a ramp does not directly determine the strength of the frictional force between a book and an object.

The strength of the frictional force between a book and an object is not directly influenced by the height of a ramp. The nature of the surfaces in contact, the force forcing the surfaces together (normal force), and the coefficient of friction are some of the variables that affect the frictional force between two surfaces.

The coefficient of friction between the book and the object plays a major role in determining the strength of the frictional force.

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Answer:

Explanation:

In Pre-AP Chemistry, the development of models to explain their macroscopic observations is a primary means through which students develop an understanding of the molecular world.

You will be forced to think and apply concepts to new situations, and even derive your own theories from application. This is excellent preparation for the higher levels of thinking required in college.

Chemistry, the science that deals with the properties, composition, and structure of substances (defined as elements and compounds), the transformations they undergo, and the energy that is released or absorbed during these processes.

The name for a positive ion is a cation.

Answer:

Deduce the balanced chemical equation:

CaCO3(s) + 2HCl(aq) > CaCl2 + H2O(l) + CO2(g)

2. Write as ionic species:

Ca2+(aq) + CO3 2- (aq) + 2H+ + 2Cl- > Ca2+(aq)+ 2Cl-(aq) + H2O(l) + CO2(g)

3. Identify ions on the right that also appear on the left, and eliminate them. (As Robert Cruikshank says, these are known as ’spectator ions’ and take no overall part in the reaction):

CO3 2- (aq) + 2H+(aq) > H2O(l) + CO2(g)

This is the balanced ionic equation.

Answer: The pressure will be 411 GH.

Explanation:

To calculate the final pressure of the system, we use the equation given by Gay Lussac Law. This law states that pressure of the gas is directly proportional to the temperature of the gas at constant volume

Mathematically,

\(\frac{P_1}{T_1}=\frac{P_2}{T_2}\)

where,

\(P_1\text{ and }T_1\) are the initial pressure and temperature of the gas.

\(P_2\text{ and }T_2\) are the final pressure and temperature of the gas.

We are given:

\(P_1=570\\T_1=2.33\\P_2=?\\T_2=1.68\)

Putting values in above equation, we get:

\(\frac{570}{2.33}=\frac{P_2}{1.68}\\\\P_2=411\)

Thus the pressure will be 411 GH.