Which type of extremophile is characterized by thriving in very hot and salty conditions? a) Halophile b) Psychotroph c) Mesophile d) Acidophilic

Three ways to change the rate of a reaction are by increasing the concentration of reactants, changing the temperature, and adding a catalyst.

Three ways to change the rate of a reaction:

1. Increasing the concentration of reactants: This increases the collision frequency between particles, leading to a higher reaction rate. For example, in the reaction between hydrogen and iodine to form hydrogen iodide, increasing the concentration of hydrogen and iodine will speed up the reaction.
2. Changing the temperature: Higher temperatures increase the kinetic energy of particles, making them move faster and collide more frequently. This results in a faster reaction rate. Using an example, raising the temperature of the reaction between magnesium and hydrochloric acid will speed up the rate of reaction.
3. Adding a catalyst: Catalysts are substances that speed up reactions by providing an alternative reaction pathway with lower activation energy. For instance, adding an enzyme catalyst like amylase to the reaction between starch and iodine will increase the reaction rate.

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The three main ways to change the rate of reaction based on principles that affect rates of reactions are concentration, temperature, and catalysts .let us describe them one by one further.

Three ways to change the rate of a chemical reaction are:

• Concentration Change: Increasing the concentration of reactants usually speeds up the reaction. This is due to more frequent collisions between particles, increasing the likelihood of successful collisions leading to product formation.
• Temperature Change: Raising the temperature accelerates reactions by providing more energy to reactant particles, increasing their kinetic energy, and promoting successful collisions.
• Catalysts: Adding a catalyst lowers the activation energy required for the reaction, making it easier for reactants to transform into products. Catalysts provide an alternate reaction pathway, allowing reactions to occur at lower energy levels and faster rates.

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Based on the calculation, the velocity of this wave is equal to 420 m/s.

Given the following data:

• Frequency of turning fork = 280 hertz.

• Wavelength of sound produced = 1.5 meters.

How to calculate the velocity of a wave?

Mathematically, the velocity of a wave is calculated by using this formula:

V = λF

Where:

• F is the frequency of a wave.

• V is the velocity of a wave.

• λ is the wavelength of a wave.

Substituting the given parameters into the formula, we have;

V = 1.5 × 280

V = 420 m/s.

Note: You should use the above formula to solve the other questions.

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Answer: Option (3) is the correct answer.

Explanation:

When an element exists in two or more different physical forms then they are known as allotropes.

For example, diamond and graphite are both allotropes of carbon.

In graphite, carbon atoms are joined together in sheets of six sided lattice. Whereas in diamond, carbon atoms are joined together in four cornered lattice.

Therefore, as these allotropes are made up of same element so they have similar chemical properties but different physical properties like melting point, boiling point etc.

Also, both of them have different molecular structure.

Thus, we can conclude that the statement the differ in their molecular structure and properties correctly describes diamond and graphite.

Answer:

5 significant figures

Explanation: