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Which of the following would result in an increase in the chemical reaction?

A. Adding more of the product

B. Decreasing the concentration of the reactant

C. Sealing the reaction in an airtight container

D. Using a mortar and pestle to grind a solid reactant to a powder

Answer Explanation:

Crushing a solid reactant into powder increases the surface area of the reactant, thereby increasing chemical reaction. This is because more of the reacting molecules or ions are exposed to the other reactant, which increases the chance of particles colliding and leads to more successful collisions per second.

 

Therefore, the Correct Answer is D.

More Questions on TEAS 7

  • Q #1: When a volcano erupts, its actions are similar to which of the following events?

    A. A food eroding the banks of a stream

    B. A can of soda fling when it is opened

    C. A tree root pushing up through the pavement

    D. A building burning to the ground

    Answer Explanation

    Both involve the release of pressure from a confined space. In the case of a volcano, pressure builds up beneath the Earth's surface, causing an eruption. Similarly, when a can of soda is opened, the release of pressure inside the can causes the soda to fizz and potentially spray out.

  • Q #2: Which of the following expressions represents the sum of three times a number and eight times a different number?

    A. 3x+8y

    B. 8x+3x

    C. 3x-8y

    D. 8x-3y

    Answer Explanation

    Let two numbers be x and y. Then

    Three-time a number=3x

    Eight times a different number = 8y

    The sum of the two is 3x+8y

  • Q #3: Water molecules enter cells by which of the following transport mechanisms?

    A. Gated channels

    B. Proton pumps

    C. Facilitated diffusion

    D. the following transport mechanisms?

    Answer Explanation

    Water molecules are polar and cannot easily cross the hydrophobic lipid bilayer of the cell membrane. They use aquaporins, which are water channels that allow water to pass through.