Chemistry College

Which has more kinetic energy: a 0.0020-kg bullet traveling at 415 m/s or a 6.9 107-kg ocean liner traveling at 14 m/s (27 knots)?

Ek-bullet = ____ J
Ek-ocean liner = ____ J

Answers

Answer 1

The bullet has a kinetic energy of approximately 344.45 joules (J), while the ocean liner has a kinetic energy of approximately 676,200,000 joules (J). As we can see, the ocean liner has significantly more kinetic energy than the bullet due to its larger mass and velocity.

To calculate the kinetic energy of an object, we use the formula:

Kinetic Energy (Ek) = 0.5 * mass * velocity^2

Let's calculate the kinetic energy for both the bullet and the ocean liner:

For the bullet:

Mass (m) = 0.0020 kg

Velocity (v) = 415 m/s

Ek-bullet = 0.5 * 0.0020 kg * (415 m/s)^2

Ek-bullet = 0.5 * 0.0020 kg * 172225 m^2/s^2

Ek-bullet = 344.45 J

For the ocean liner:

Mass (m) = 6.9 * 10^7 kg

Velocity (v) = 14 m/s

Ek-ocean liner = 0.5 * (6.9 * 10^7 kg) * (14 m/s)^2

Ek-ocean liner = 0.5 * (6.9 * 10^7 kg) * 196 m^2/s^2

Ek-ocean liner = 676200000 J

Therefore, the bullet has a kinetic energy of approximately 344.45 joules (J), while the ocean liner has a kinetic energy of approximately 676,200,000 joules (J). As we can see, the ocean liner has significantly more kinetic energy than the bullet due to its larger mass and velocity.

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Which statements are true about catalysts

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The true statements about catalysts are the statement 1,2 and 3.

1. Catalysts increase the rate of reaction: Catalysts facilitate chemical reactions by providing an alternative reaction pathway with lower activation energy. They enhance the rate of the reaction without being consumed in the process.

2. Catalysts behave as reactants in the reaction mixture: Catalysts participate in the reaction by interacting with the reactants. They form temporary bonds with the reactant molecules, leading to the formation of an intermediate complex that ultimately results in the desired products.

3. Catalysts decrease the activation energy of a reaction: Catalysts lower the energy barrier required for a reaction to occur by providing an alternative pathway with a lower activation energy. This enables the reactants to overcome the energy barrier more easily, thus increasing the reaction rate.

4. Catalysts show no physical change at the end of the reaction: Catalysts are not consumed or permanently altered in the reaction. They remain chemically unchanged and are available to participate in subsequent reaction cycles.

The statement "Catalysts are required in large concentrations in a reaction" is false. Catalysts work effectively even in small concentrations, as their role is to facilitate the reaction rather than being directly involved in the stoichiometry of the reaction.

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the nucleus of every atom contains protons. true or false?

Answers

Answer:

true

Explanation:

atomic nuclei consist of electrically positive proton and electrically neutral neutrons. These are held together by the strongest known fundamental force, called the strong force.

The nucleus of every atom contains protons. This statement is true.

Protons are positively charged subatomic particles, which are one of the fundamental components of an atom, along with neutrons and electrons. Protons play a crucial role in determining the identity of an element. They determine the atomic number of an element.

The atomic number is used to arrange elements in the periodic table and is used as a basis for defining the number of electrons in an atom of that element. The arrangement and combination of protons, along with neutrons, determine the atom's mass and stability.

In summary, protons are an essential component of the nucleus in all atoms, making the statement true.

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which is an example of a colloid? a mixture that settles out, a mixture that scatters light, a mixture that is separated by filtration, or a salt and water mixture?

Answers

These substances have dispersed particles that are large enough to scatter light, making the beam visible. Therefore, out of the options provided, a mixture that scatters light is an example of a colloid. Option B)

A colloid is a type of mixture in which particles are dispersed throughout a medium, creating a homogeneous appearance. Unlike solutions, where the particles are completely dissolved, and suspensions, where the particles settle out, colloids have particles that are larger than those in solutions but smaller than those in suspensions. One characteristic of colloids is that they can scatter light due to the size of the particles. This scattering of light is known as the Tyndall effect. Examples of colloids include milk, fog, and aerosol sprays. These substances have dispersed particles that are large enough to scatter light, making the beam visible. Therefore, out of the options provided, a mixture that scatters light is an example of a colloid. Therefore option B) is correct

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Note Complete Question

which is an example of a colloid?

a mixture that settles out,

b mixture that scatters light,

c mixture that is separated by filtration,  

d salt and water mixture?

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