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Vanyuwa [196]
3 years ago
13

_____ The primary function of molecular membranes is the transport of ions and molecules into and out of cells. The movement of

molecules from areas of low concentration to those of high concentration against chemical gradients is best described as
Chemistry
1 answer:
ale4655 [162]3 years ago
5 0
<h2>Active Transport </h2>

Explanation:

  • A cell uses energy for the movement of substances against a concentration gradient or an electrochemical gradient that maintains a balanced concentration of ions and molecules in living cells.
  • This transport of substances is known as Active transport mechanisms which are the basic function of the cell membranes.
  • The energy used is in the form of ATP.  
  • Active transport occurs when there is a difference in the concentration of particles on both sides.
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Gas x would be carbon dioxide.

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the white precipitate would be calcium carbonate. CaCo₃

note/ this is a common eqn u need to remember.

X - CO₂ (carbón dioxide)
Y - CaCo₃ (calcium carbonate)

sodium carbonate is a basic salt
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At what temperature in the Kelvin scale does water boil? Explain what happen when we supply heat energy to water till it changes
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What is the molar mass of lead nitrate (Pb(NO3)2) from the equation below?
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3 years ago
Phosphate buffers are commonly used in biological research. If a small amount of strong acid is added to a buffer solution that
lozanna [386]

Answer:

A) [H3PO4] will increase, [KH2PO4] will decrease, and pH will slightly decrease.

Explanation:

A buffer is a solution which resists changes to its pH when a small amount of acid or base is added to it.

Buffers consist of a weak acid (HA) and its conjugate base (A–) or a weak base and its conjugate acid. Weak acids and bases do not completely dissociate in water, and instead exist in solution as an equilibrium of dissociated and undissociated species. When a small quantity of a strong acid is added to a buffer solution, the conjugate base, A-, reacts with the hydrogen ions from the added acid to form the weak acid and a salt thereby removing the extra hydrogen ions from the solution and keeping the pH of the solution fairly constant. On the other hand, if a small quantity of a strong base is added to the buffer solution, the weak acid dissociates further to release hydrogen ions which then react with the hydroxide ions of the added base to form water and the conjugate base.

For example, if a small amount of strong acid is added to a buffer solution that is 0.700 M H3PO4 and 0.700 M KH2PO4, the following reaction is obtained:

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Therefore, [H₃PO₄] will increase, [KH₂PO₄] will decrease, and pH will slightly decrease.:

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