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butalik [34]
4 years ago
12

In term of molecules explain what happen to a sugar cube when it is placed into a beaker of water

Chemistry
2 answers:
bazaltina [42]4 years ago
7 0
The sugar cube dissolves.<span />
Setler [38]4 years ago
5 0
The molecules in the sugar move from an area of higher concentration to an area of lower concentration in the water. ... They pick up molecules outside of the cell and bring them in.
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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
a gas occupies 1.85 L at 819 torr and 15*C What volume will it fill if the pressure is changed to 712 torr and the temperature i
Tomtit [17]

Explanation:

P1V1/T1=P2V2/T2(general gas equation)

(829×1.85)/(273+15)=712×V2/(273+46)

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3 years ago
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