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Rina8888 [55]
3 years ago
11

John and Lisa collected a sample of ocean water and placed it in a jar. Within a couple of days, the water had evaporated and sa

lt was visible at the bottom of the jar.
This is an example of a
O A solute being dissolved.
B
new substance being formed.
O
С
chemical change
o
D
physical change
Chemistry
1 answer:
omeli [17]3 years ago
8 0

THE Answer is Physical Change.

Explanation:

THANKS BB

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xeze [42]

Answer: a

Explanation: trust me

7 0
3 years ago
A 0.187 M weak acid solution has a pH of 3.99. Find Ka for the acid. Express your answer using two significant figures.
Anna35 [415]

Answer:

5.56 × 10⁻⁸

Explanation:

Step 1: Given data

  • Concentration of the weak acid (Ca): 0.187 M
  • pH of the solution: 3.99

Step 2: Calculate the concentration of H⁺

We will use the following expression.

pH = -log [H⁺]

[H⁺] = antilog -pH = antilog -3.99 = 1.02 × 10⁻⁴ M

Step 3: Calculate the acid dissociation constant (Ka)

We will use the following expression.

Ka = \frac{[H^{+}]^{2} }{Ca} = \frac{(1.02 \times 10^{-4})^{2} }{0.187} = 5.56 \times 10^{-8}

3 0
3 years ago
blood plasma for average adults has a volume of 3100mL. if the density of plasma is 1.020 g/mL, what mass of plasma is in the av
Gnoma [55]

Answer:

The volume of blood plasma in adults is 3.1 L. it's density is 1.03 g/cm3.

Explanation:

4 0
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The illustration depicts the formation of an ionic chemical bond between lithium and fluorine atoms. Why is the resulting compou
nirvana33 [79]
<span>The transferred electron from lithium to fluorine provides each atom with a full outer energy level.</span>
7 0
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Read 2 more answers
How to separate crystals from solution​
tatiyna

Answer:

If a saturated hot solution is allowed to cool, the solute is no longer soluble in the solvent and forms crystals of pure compound. Impurities are excluded from the growing crystals and the pure solid crystals can be separated from the dissolved impurities by filtration.

6 0
2 years ago
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