The tomato is dropped. What is the velocity, v
, of the tomato when it hits the ground? Assume 86.0 %
of the work done in Part A is transferred to kinetic energy, E
, by the time the tomato hits the ground.
Express your answer with the appropriate units.

Answer:

Temperature, concentration, and a catalyst can all affect the rate of a chemical reaction.

Temperature: Increasing the temperature generally increases the rate of a reaction. This is because higher temperatures provide more kinetic energy to the reactant particles, causing them to move faster and collide more frequently. With increased collision frequency, the chances of successful collisions with sufficient energy to overcome the activation energy barrier and proceed with the reaction are also increased. As a result, the reaction rate typically increases with temperature.

Concentration: Increasing the concentration of reactants generally increases the rate of a reaction. When the concentration of reactant particles is higher, they become more crowded, increasing the likelihood of collisions between reactant particles. With more collisions occurring, there is a higher probability of successful collisions leading to a reaction. Therefore, higher reactant concentrations generally result in a higher reaction rate.

Catalyst: A catalyst is a substance that increases the rate of a reaction by providing an alternative reaction pathway with a lower activation energy. Catalysts themselves are not consumed during the reaction and do not undergo any permanent changes. They work by providing an alternative route that requires less energy for the reactants to reach the transition state. This lowers the activation energy barrier, making it easier for the reaction to occur. By providing an alternative pathway, catalysts increase the rate of reaction without being consumed in the process.

Regarding collision theory, the three key points required for a reaction to happen are:

Collision: Reactant particles must collide with each other for a reaction to occur. Collisions bring the reactant particles in close proximity, allowing them to interact and potentially form new chemical bonds.

Energy: Colliding particles must possess enough energy, equal to or greater than the activation energy, for the reaction to take place. Activation energy is the minimum energy required for the reactant particles to break existing bonds and initiate the formation of new bonds. Only collisions with sufficient energy can overcome the activation energy barrier and lead to a reaction.

Orientation: In addition to sufficient energy, the collision between reactant particles must occur with the correct orientation. This means that the particles must collide in a way that allows the necessary atoms or groups to come into contact and form new bonds. If the collision occurs with an incorrect orientation, the particles may simply bounce off each other without any reaction taking place.

In summary, according to collision theory, for a reaction to happen, reactant particles must collide with sufficient energy and the correct orientation. Temperature and concentration affect the rate of reaction by influencing collision frequency, while a catalyst provides an alternative reaction pathway with lower activation energy.

26.62 grams of HBr would be present in 355 mL of a 7.5% m/v HBr solution.

Concentration refers to the amount of a substance in a defined space. Another definition is that concentration is the ratio of solute in a solution to either solvent or total solution.

There are various methods of expressing the concentration of a solution.

Concentrations are usually expressed in terms of molarity, defined as the number of moles of solute in 1 L of solution.

Solutions of known concentration can be prepared either by dissolving a known mass of solute in a solvent and diluting to a desired final volume or by diluting the appropriate volume of a more concentrated solution (a stock solution) to the desired final volume.

Given,

HBr = 7.5% m/ v

This means 7.5g of HBr in 100 ml of the solution.

1 ml of the solution has 0.075g

355 ml of the solution will have = 0.075 × 355 = 26.62g of HBr

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Answer:

The new pressure will be 0.494 atm.

Explanation:

We can use the ideal gas law to solve this problem:

PV = nRT

where:

We know that the initial pressure is 0.988 atm, the initial volume is 1 L, and the temperature is constant.

We also know that the final volume is 2 L.

We can solve for the final pressure as follows:

[tex]P_2 = \frac{P_1V_1}{V_2}[/tex]

substituting value

[tex]P_2 = \frac{0.988\: atm*1 L}{2 L}[/tex]

[tex]P_2 = 0.494 atm[/tex]

Therefore, the new pressure will be 0.494 atm.

Answer:

To convert joules to calories, you can use the conversion factor:

1 calorie = 4.184 joules

To find out how many calories are in 4,180 joules, divide the given value by the conversion factor:

4,180 joules / 4.184 joules per calorie = 0.9 calories (approximately)

Therefore, there are approximately 0.9 calories in 4,180 joules.

Answer:

How many moles of CaCl2 are needed would be 0.005 moles.

How many grams of CaCl2 are needed would be 0.555 grams.

1) The higher the temperature and the concentration, the more the Collison between the reactants and the more they react. A catalyst only speeds up the rate of reaction

2) The Collison frequency, orientation and the activation energy

3) At equilibrium, the rate of the forward and the reverse reactions are the same.

4) Increasing the concentration of the reactants would shift the equilibrium to the right

5) Decreasing the products would shift the equilibrium position to the right.

Chemistry has a hypothesis known as the collision theory that describes how chemical reactions take place. According to this, reacting particles (atoms, molecules, or ions) must collide in order for a reaction to occur. The theory offers a framework for comprehending the variables that affect the likelihood and pace of chemical reactions.

The influence of variables including temperature, concentration, surface area, and the presence of catalysts on the pace of chemical reactions is explained in part by the collision hypothesis.

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Answer:

Explanation:

c) fusion combines into one product plus energy

The formula that represents an isomer of CH3−CH2−COOH is D. CH3−CH2−CO2−CH3.

An isomer is a compound that has the same molecular formula but differs in the arrangement or connectivity of its atoms. In this case, the molecular formula is CH3−CH2−COOH, which represents the carboxylic acid called propanoic acid.

Option D, CH3−CH2−CO2−CH3, is an isomer of propanoic acid. It represents methyl propanoate, an ester formed by the reaction of propanoic acid with methanol. In this isomer, the -COOH group of propanoic acid is replaced with -COOCH3 group, indicating the presence of an ester functional group.

Options A, B, and C do not represent isomers of CH3−CH2−COOH. Option A, CH3−C−OH−CH3, represents dimethyl ether, an entirely different compound. Option B, CH3−CO−O−CH3, represents dimethyl carbonate, which also has a different structure. Option C, CH3−CO−CO−CH3, represents a compound known as methyl propanoate, which is not an isomer but the same compound as option D. Therefore, option D is correct.

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Answer:

Una reacción exotérmica es aquella cuyo valor de entalpía es negativo, es decir, el sistema desprende o libera calor al entorno (ΔH < 0). Una reacción endotérmica es aquella cuyo valor de entalpía es positivo, es decir, el sistema absorbe calor del entorno (ΔH > 0).

Explanation: