Pls answer number 4, my grade depends on it

Answer:

1. Heating up a test tube containing reacting Magnesium metal and Hydrochloric acid will increase the reaction rate. This is because heating increases the kinetic energy of the reactant particles, making them move faster and collide more frequently and with greater energy. The increased frequency and energy of collisions will result in a higher rate of successful collisions, leading to a faster reaction.

2. Decreasing the pressure in a syringe containing reacting Sodium chloride and Silver nitrate will not have any significant effect on the reaction rate. This is because the reaction rate is determined by the concentration of the reactants, not the pressure. Lowering the pressure will cause the gases to expand, but it will not affect the concentration of the reactants or the frequency of their collisions. Therefore, the reaction rate will remain unchanged.

Explanation:

The statement that is true about strong electrolytes , weak electrolytes , and non-electrolytes is:

Silver chloride (AgCl) is insoluble in water; option D.

Chloride (Cl-) ion is soluble in water; option C

Potassium iodide (KI) and silver nitrate (AgNO₃) will result in a precipitate, according to solubility rules; option D.

Dilute solutions have a higher solvent-to-solute ratio than concentrated solutions; option A.

The volume of sodium chloride solution required is calculated using the formula:

Where:

M1 = 0.500 M (initial concentration)

V1 = volume of initial solution (unknown)

M2 = 0.100 M (final concentration)

V2 = 500 mL = 0.500 L (final volume)

Rearranging the formula to solve for V1, we get:

V1 = M2V2/M1

V1 = (0.100 M)(0.500 L)/(0.500 M)

V1 = 0.100 L

The volume of the 0.500 M sodium chloride solution required is 0.100 L.

15. The volume of the original solution required will be;

M1V1 = M2V2

Where:

M1 = 0.500 M (initial concentration)

V1 = volume of initial solution (unknown)

M2 = 0.100 M (final concentration)

V2 = 250 mL = 0.250 L (final volume)

Rearranging the formula to solve for V1, we get:

V1 = M2V2/M1

V1 = (0.100 M)(0.250 L)/(0.500 M)

V1 = 0.050 L or 50.0 mL

The volume of the original 0.500 M hydrochloric acid solution needed is 50.0 mL.

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Answer: Flat. The meniscus will be flat/neutral with no curves if adhesion and cohesion are equal.

The stoichiometric concept is used here to determine the limiting reactant of the reaction. The relationship between the quantities of reactants and products of a chemical reaction is called stoichiometry. Here the limiting reactant is H₂ .

The substance which is totally consumed when the chemical reaction is complete is defined as the limiting reagent. The amount of the product formed is limited by this reagent.

The balanced equation is:

N₂ + 3H₂ → 2NH₃

8 mol H₂ × 2 NH₃ / 3 H₂  = 5.33 mol NH₃

3 mol N₂ × 2 NH₃ / 1 = 6 mol NH₃

Thus H₂ is the limiting reagent.

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Jacinda Ardern got involved with Tonga after the eruption due to the following reasons:

The correct answer is: 2, 3, and 4.

Jacinda Ardern, the Prime Minister of New Zealand, got involved with Tonga after the underwater volcanic eruption that occurred in January 2022.

There were several reasons why she got involved:

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Complete question:

Which of these are the reasons why Jacinda Ardern got involved with Tonga after the eruption?

1. the desire to preserve ocean resources in the area through satellite monitoring

2. the desire to get rid of the ash plume that threatens to cover New Zealand

3. the desire to acquire more information about the volcano's current activity

4. the desire to provide assistance to the people of Tonga by giving them provisions

3 and 4

2, 3 and 4

1 only

O 1 and 2

An example of false solution is a natural gas.

Natural gas is primarily methane with smaller quantities of other hydrocarbons.

It was formed millions of years ago when dead marine organisms sunk to the bottom of the ocean and were buried under deposits of sedimentary rock.

False solutions are those that do not actually address the problem at hand substantially but deceive people into believing that they do, while at the same time triggering other serious problems.

Examples of false solutions include:

Therefore, an example of false solution is a natural gas.

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NaCl is least soluble in 100. g of water at 50C.

It forms a hydroxyl group with water molecules, but non-polar other hydrocarbons with equivalent molecular weights do not.As a result, alcohol dissolves better in water.

Because of the formation of a weak acid or aluminum salt as a result of the reaction between aluminum phosphate and acid, aluminum phosphate is more accessible in acid than water.Acids can so dissociate aluminum phosphate more effectively than water.

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Answer: As a result, when you add oil to a cup of water the two don't mix with each other. Because oil is less dense than water, it will always float on top of water, creating a surface layer of oil.