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TEAS 7 Science TEAS 7 Science Exam 5 Which of the following would result in a...

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 Science

  • Q #1: Which of the following parts of the eukaryotic cell is responsible for making ATP?

    A. Lysosome

    B. Nucleus

    C. Centrioles

    D. Mitochondria

    Answer Explanation

    ATP is produced by a series of reactions that occur in the mitochondria. The mitochondria have a double membrane structure, with an inner membrane that is folded into cristae. These cristae contain the enzymes and proteins that are involved in the process of cellular respiration, which converts glucose and oxygen into ATP and carbon dioxide.

  • Q #2: A strand of DNA bases reads 5' AGCTAGCGT 3, what would the sequence of bases on the contemporary strand read?

    A. 3' STOGUTCGCU

    B. 5' AGCTAGCGT S

    C. 3' SUCGAUCICA

    D. 3' TCGATCGCA 5'

    Answer Explanation

    The complementary strand of DNA is formed by pairing complementary bases. In DNA, adenine (A) pairs with thymine (T), and guanine (G) pairs with cytosine (C). Additionally, RNA uses uracil (U) instead of thymine.

    Given the sequence 5' AGCTAGCGT 3', the complementary strand would read:

    3' TCGATCGCA 5'

  • Q #3: A slice of apple left on a table slowly goes brown due to an enzymatic reaction. Dipping the apple slice in lemon juice prevents it from browning Which of the following best explains this result?

    A. Lemon juice has enzymes which reverse the browning reaction

    B. Lemon juice has a pH which inactivates the enzymes

    C. Lemon juice functions to bleach the brown material

    D. Lemon juice functions to dilute the brown material

    Answer Explanation

    Browning of the apple surface is due to the action of the enzyme polyphenol oxidase. Lemon juice is acidic and lowers the pH of the apple's surface. This inactivates the enzyme polyphenol oxidase, which works best at a neutral pH. This in turn reduces the browning action on the apple.

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