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uranmaximum [27]
3 years ago
14

4.

Chemistry
1 answer:
Nataly_w [17]3 years ago
6 0

Answer:

The current speed of Sarah is 8 m/s.

Explanation:

Speed:

''It is the distance travel in per unit time". It tells the capacity of moving object how fast it is moving.

Unit:

The system international unit of speed is m/s. It can also be given in Km/h

Formula:

r = d / t

r = speed   (it can also be represented by v)

t = time taken to cover the distance

d =  distance

Given data:

Distance = 400 m

Time = 50 s

Speed = ?

Solution:

v = d/ t

v = 400m / 50 s

v = 8 m/s

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Using the necessary reagents to faciliate the synthesis of the organic compounds as shown in the attached file.

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A shampoo has a pH of 8.59. What is the [H3O+] in the shampoo?
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2.57 e-9

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Calculate the pH of a 0.10 M HCN solution that is 0.0070% ionized.
Anastaziya [24]

Answer:

D) 5.15

Explanation:

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HCN(aq) ⇄ H⁺(aq) + CN⁻(aq)

Step 2: Calculate [H⁺] at equilibrium

The percent of ionization (α%) is equal to the concentration of one ion at the equilibrium divided by the initial concentration of the acid times 100%.

α% = [H⁺]eq / [HCN]₀ × 100%

[H⁺]eq = α%/100% × [HCN]₀

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