Select the correct answer.
In which situation is no work considered to be done by a force?

A.
when the angle between the force and displacement is 180°
B.
when the angle between the force and displacement is 90°
C.
when the angle between the force and displacement is 45°
D.
when the angle between the force and displacement is 0°

Alkenes are a group of unsaturated hydrocarbons (i.e., molecules with solely carbon and hydrogen) that include at least one double bond from carbon to carbon. Olefins is a different name for alkenes. Due to the double bond, alkenes are more reactive than alkanes.

What is Hydrocarbon?

A hydrocarbon is an organic compound made entirely of the two atom kinds of carbon and hydrogen. Hydrocarbons are typically colourless gases with barely perceptible odours. The four subcategories that are generally used to classify hydrocarbons are alkanes, alkenes, alkynes, and aromatic hydrocarbons. These chemicals' structures could be quite simple or extremely intricate. The study of hydrocarbons can provide insight into the chemistry and behavior of other functional groups. For commercial purposes, liquefied petroleum gas, which is produced from hydrocarbons like propane and butane, is also used as a fuel source (LPG). Benzene, one of the most fundamental aromatic hydrocarbons, serves as the building block for many synthetic drugs.

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Complete question

Name The Alkenes Below. Name The Alkenes Below. A) Ball& Sticklabels B) Ball & Stick ▼

Answer:

If you are referring to the Precambrian time, the answer is 500 Million Years Ago.

Explanation:

Precambrian time is the time period that started with the formation of Earth and ended about 500 million years ago.

the supports are for the influences climate of the ecosystem

define the ecosystem ?

This article discusses the ecosystem and its various components. An ecosystem is a community or collection of living and nonliving creatures and their interactions with one another. They can be both natural and manufactured. Every ecosystem is made up of two parts: biotic components and abiotic components. Biotic components are all live species in an ecosystem, whereas abiotic components are non-living substances. These biotic and abiotic interactions keep the ecosystem in balance. Let's go through the ecosystem's components in depth.

An ecosystem is a geographical region in which plants, animals, and other species, as well as weather and scenery, coexist to produce a living bubble.

the supports are for the influences climate of the ecosystem

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Answer:

V₂ = 283.15 L

Explanation:

The temperature must be in kelvin scale. We will convert the degree celsius into kelvin and then solve the equation for V₂.

T₁ = 23°C (23+273.15 = 296.15 K)

T₂ = 16°C (16+273.15 = 289.15 K)

Now we will calculate the value of V₂

290 L / 296.15 K = V₂ / 289.15 K

V₂ = 290 L × 289.15 K / 296.15 K

V₂ = 83853.5 L.K /296.15 K

V₂ = 283.15 L

0.0174 M is the calculated [H₃O+] for 0.0087 M H₂SO₄.  Molarity is an important concept in chemistry.

Molarity, which is defined as the number of moles of solute dissolved per liter of solution, is a measure of a solution's concentration. It is often written with the symbol "M" and is measured in moles per liter (mol/L) units.

The molarity of a solution is determined by dividing the volume of the solution in liters by the number of moles of the solute present in that volume. because it allows us to quantify the amount of substance present in a solution. It is frequently used in stoichiometric calculations to determine the amounts of a chemical reaction's reactant and product that should be known. For instance, if a solution contains 2 moles of solute dissolved in 1 liter of solution, the molarity of the solution is 2 mol/L.

Because it fully dissociates in water, H₂SO₄ is a powerful acid that produces two H+ ions for every molecule that dissociates. As a result, the [H₃O+] in a solution of 0.0087 M H₂SO₄ is twice as molten as the H₂SO₄ solution: [H₃O+] = 2 x [H+] = 2 x 0.0087 M = 0.0174 M.

Accordingly, the [H₃O+] of a H₂SO₄ solution containing 0.0087 M is 0.0174 M.

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The pH of the resulting solution after dilution is still 4. Dilution does not change the pH of the solution since pH is a measure of hydrogen ion concentration, which remains constant during dilution.

pH is a measure of the concentration of hydrogen ions (H+) in a solution. A pH of 4 indicates a relatively high concentration of H+ ions, meaning the solution is acidic. When you dilute a solution, you are adding more solvent to decrease the concentration of solute. However, dilution does not affect the concentration of H+ ions because the dissociation of the acid remains the same. In this case, if you dilute 10 mL of the acidic solution to a final volume of 1000 mL, the concentration of H+ ions remains unchanged. Therefore, the pH of the resulting solution is still 4, indicating that it remains acidic.

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Answer:

Explanation:

Decomposition reaction, also known as analysis or dissociation, is a type of chemical reaction in which a compound breaks down into simpler substances or elements. In this reaction, a single reactant undergoes a chemical change and produces two or more products.

The decomposition reaction can be represented by the general equation:

AB → A + B

Where AB is the reactant, and A and B are the products. The reactant AB is usually a compound, and it breaks down into its constituent elements or simpler compounds.

There are different types of decomposition reactions, including:

Thermal decomposition: It occurs when a compound is heated, resulting in its decomposition into simpler substances. For example, the thermal decomposition of calcium carbonate (CaCO3) produces calcium oxide (CaO) and carbon dioxide (CO2):

CaCO3 → CaO + CO2

Electrolytic decomposition: It takes place when an electric current is passed through an electrolyte, causing it to break down into its component ions. For instance, the electrolysis of water (H2O) leads to the decomposition into hydrogen gas (H2) and oxygen gas (O2):

2H2O → 2H2 + O2

Photochemical decomposition: It occurs when a compound undergoes decomposition due to exposure to light energy. Chlorine gas (Cl2) can decompose into chlorine atoms (Cl) under the influence of light:

Cl2 → 2Cl

These are just a few examples of decomposition reactions. They are important in various chemical processes and are used in industries, laboratory experiments, and natural phenomena. By understanding and controlling decomposition reactions, scientists can gain insights into the behavior of different compounds and develop practical applications in fields such as chemistry, materials science, and environmental science.

Answer:

Explanation:

reaction in which a compound breaks down into simpler substances or elements

The Lewis structure of AsO showing 2 lone pairs is as follows:

O

As

/

X X (where X represents a lone pair)

The molecular geometry of AsO is trigonal planar. The central As atom is hybridized with sp2 hybridization. The approximate bond angles in AsO are 120 degrees. The AsO ion is polar.

A Lewis structure, also known as a Lewis dot diagram, is a way to represent the chemical bonding in a molecule. It uses dots (also called electron dots or Lewis dots) to show the valence electrons on an atom, and lines to show the bonds between atoms. The goal of drawing a Lewis structure is to use the valence electrons of the atoms in a molecule to form the most stable arrangement of atoms, that is to say, to achieve the octet rule where each atom has 8 valence electrons in its outermost shell.

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The ball and stick model is not a true representation of the structure of an ionic compound because it oversimplifies the compound's structure and does not accurately portray the continuous electrostatic interactions between ions in the lattice.

The ball and stick model represents atoms as spheres (balls) and the bonds between them as sticks. In an ionic compound, however, there are no discrete molecules with specific bonds. Instead, ionic compounds consist of a repeating arrangement of positively charged cations and negatively charged anions in a lattice structure. This lattice structure results in a continuous network of electrostatic interactions between the ions, which the ball and stick model fails to represent accurately.

CWhile the ball and stick model can be helpful for visualizing molecular structures, it is not an accurate representation of ionic compounds due to its inability to depict the continuous lattice structure and electrostatic interactions present in these compounds.

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Answer:

Solid

Explanation:

Answer:

When hydrochloric acid comes into contact with calcium carbonate, the following chemical reaction ensues: CaCO3 + 2HCl → CaCl + CO2 + H2O, which provides acid neutralization alongside the formation of byproducts

Answer:

C) liquid

Explanation:

edge 2023

Answer: If a pinch of mercury is consumed you will die from it so using a mercury thermometer is very unsafe if its breaks and a child consumes that mercury.

Explanation:

Don't use one

If the glass breaks and the mercury is not properly cleaned up, the little silvery ball within a mercury thermometer might be hazardous. As the mercury evaporates, it may pollute the air around and turn dangerous to both people and animals.

Children that have been exposed to mercury have lower IQs, hearing impairments, and worse coordination.

Long-term exposure worsens and exacerbates symptoms, which may lead to personality changes or even coma.

Mercury thermometers can be replaced by a number of things:

These non-mercury fever thermometers are significantly safer and equally accurate as mercury thermometers.

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Answer:

F=ma where F = force in N, m = mass in g and a = acceleration in \(m/s^{2}\)

The ion channel that opens in response to acetylcholine is an example of a ligand-gated ion channel, which is a type of direct or membrane signal transduction system.

In this system, the neurotransmitter acetylcholine acts as the ligand that binds to the receptor site on the ion channel, causing it to open and allow the flow of ions across the cell membrane.

This rapid change in ion concentration can trigger a range of cellular responses, such as muscle contraction or nerve impulse transmission.

Ligand-gated ion channels are distinct from other types of signal transduction systems, such as G protein-coupled receptors and enzyme-linked receptors, which rely on intracellular signaling pathways to mediate the response to ligand binding.

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Explanation:

The value of equilibrium constant doesn't change when a catalyst is added.

Equilibrium constant depends on Concentration of reactants , Pressure and Temperature.

A suitable catalyst can improve the reaction rate. A catalyst is a material that increases the rate of a chemical reaction, but in the end, it remains unchanged chemically. It offers a lower energy alternative reaction path.

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Answer:

Nonmetal...

Explanation:

T^T

Answer: its a nonmetal

Explanation: you can look up a group divided periodic table to show the groups of different elements.

70.9-gram sample of \(Cl_{2}\) gas will occupy Opton C. 22.4 liters at STP.

To determine the volume occupied by the sample of \(Cl_{2}\) (g) at STP, we can use the ideal gas law equation, PV = nRT

where P = pressure

V = volume

n = number of moles

R = ideal gas constant

T = temperature.

At STP (Standard Temperature and Pressure), the pressure is 1 atmosphere (atm) and the temperature is 273.15 Kelvin (K).

First, calculate the number of moles of \(Cl_{2}\) (g) using its molar mass. The molar mass  \(Cl_{2}\) is 70.9 grams/mol.

Number of moles (n) = mass (m) / molar mass (M)

n = 70.9 g / 70.9 g/mol

n = 1 mol

Now, we can calculate the volume using the ideal gas law:

V = (nRT) / P

V = (1 mol * 0.0821 L·atm/mol·K * 273.15 K) / 1 atm

V ≈ 22.4 L

Therefore, the correct answer is C. 22.4 L.

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Answer:

that is impossible. the atomic number can only go up each group

Answer:

9 g/ml

Explanation:

5 + 3.3 = 8.5

But you should use sig figs.

5 has no tenths, hundredths, and etc.

Therefore the 8.5 rounds up to 9

So the answer is 9.

Answer: Iron displaces copper ions from an aqueous solution of copper sulphate. ... In this reaction, metallic iron is converted into ferrous ion (Fe2+) and cupric ion (Cu2 +) is converted into metallic copper. Fe (s) + Cu2 + (aq) —→ Fe2+ (aq) + Cu (s).

Explanation:

The scientist can conduct an experiment to determine the amount of base that can be added to a solution before the pH changes.

Here's a step-by-step approach:
1. Prepare a solution with a known pH.
2. Add a small amount of base to the solution and measure the pH using a pH meter.
3. Gradually increase the amount of base added while recording the pH at each step.
4. Observe the point at which the pH starts to change significantly.
5. Repeat the experiment multiple times to ensure accuracy and consistency.
6. Calculate the average amount of base required to cause a noticeable change in pH.
7. This average value will indicate the approximate amount of base that can be added before the pH changes significantly.

For example, if the scientist starts with a solution of pH 7 and notices a significant pH change when 10 mL of base is added, then they can conclude that around 10 mL of base is the threshold before the pH changes.
Remember, the experiment can be repeated with different solutions or bases to gather more data and ensure reliable results. The scientist should also consider using appropriate safety measures and equipment during the experiment.
Overall, this experiment will help the scientist understand the relationship between the amount of base added and the resulting pH change in a solution.

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The kinetic energy exceeds the intermolecular forces.

This is the answer.

In chemical reactions, atoms of substances taking part in the reaction are combined, separated, or rearranged.

Chemical reactions are reactions that involve changes that occur in the chemical properties of substances that result in the formation of new substances having different properties to that of the substance that underwent the changes.

Chemical reactions involve the rearrangement, combination, or separation of atoms of the substances involved in the reaction.

Chemical reactions are not easily reversible.

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Answer:

D

Explanation:

More liquid water molecules will change to water vapor until a

new equilibrium is reached.

Answer:

Equilibrium and Stability Quick Check

1. The rate of the forward reaction equals the rate of the reverse reaction.

2. More LIQUID WATER molecules will change to WATER VAPOR until a new equilibrium is reached.

3. By adding WATER (H2O).

4. The additional BROMINE IONS cause the equilibrium to shift to the REACTANTS.

5. Removing WATER (H2O).

Explanation:

100% if you put these answers.

Answer:2.14 moles

Explanation:

n=PV/RT

n=(3.2×16.2)÷(0.0821×(22+273.15)

n= 2.14 moles2

Answer:

Democritus

Explanation:

Democritus first introduced the idea of the atom almost 2500 years ago. Democritus was an important philosopher however if your talking about how the atom is today look at first rudimentary   pudding model by JJ Thomson first design then its Neils  Bohr whos model we look at today

The mass percentage of acetic acid in this vinegar sample is 1.00 %

Density is the size of ways tightly a fabric is packed collectively. it is described as the mass consistent with unit quantity. Density image: D or ρ Density system: ρ = m/V, wherein ρ is the density, m is the mass of the object and V is the quantity of the item.

Density is the substance's mass per unit of volume. The image most usually used for density is ρ, despite the fact that the Latin letter D also can be used. Mathematically, density is defined as mass divided by using volume Density is the mass of an object divided by using its extent. Density frequently has gadgets of grams according to cubic centimeters (g/cm3).

Calculation:-

Acetic Acid = 0.03 mol

moles of Gram of Acetic acid=moles x molar mass.

= 0.03 mol x 60 mol

Now, as De 1.8g Density = 1.00

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