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MrMuchimi
3 years ago
14

Rewrite 2000 to have 2 sig figs.

Chemistry
2 answers:
masha68 [24]3 years ago
8 0
2.0 x 10^3 is what I’d write
aliina [53]3 years ago
4 0
20. Would be the right answer
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Which statements below are an appropriate hypothesis in response to this question? Check all that apply. If a substance changes
Nostrana [21]

Answer:

If a substance undergoes a physical change, then it will retain most of its original properties because no new substance is formed.

If a substance undergoes a chemical change, then it will not retain its original properties because a new substance is formed.

Explanation:

So in shorter words its options 2 and 3

6 0
2 years ago
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A student performs an exothermic reaction in a beaker and measures the temperature. If the thermometer initially reads 35 degree
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2 years ago
A monoprotic weak acid when dissolved in water is 0.66% dissociated and produces a solution with a pH of 3.04. Calculate the Ka
raketka [301]

Answer:

Ka = 6.02x10⁻⁶

Explanation:

The equilibrium that takes place is:

  • HA ⇄ H⁺ + A⁻
  • Ka = [H⁺][A⁻]/[HA]

We <u>calculate [H⁺] from the pH</u>:

  • pH = -log[H⁺]
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  • [H⁺] = 9.12x10⁻⁴ M

Keep in mind that [H⁺]=[A⁻].

As for [HA], we know the acid is 0.66% dissociated, in other words:

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We <u>calculate [HA]</u>:

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Finally we <u>calculate the Ka</u>:

  • Ka = \frac{[9.12x10^{-4}]*[9.12x10^{-4}]}{[0.138]} = 6.02x10⁻⁶
3 0
2 years ago
you are studying an animal that produces only one offspring every three or four years. Is it likely to use external or internal
Igoryamba

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6 0
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