2 years ago

Please help me 13 points

Chemistry

1 answer:

Sloan [31]2 years ago

6 0

Answer:

Explanation:

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Integrated Problem 01.69 With current spectroscopic techniques, chemists are generally able to determine the structure of an unk

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a or c becuse it means you should answer it very wiseley

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The specific heat of gold is 0.031 calories/gram°C. If 10.0 grams of gold were heated and the temperature of the sample changed

eimsori [14]

The answer is A. 6.2 calories

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What is the Ka of a weak acid (HA) if the initial concentration of weak acid is 4.5 x 10-4 M and the pH is 6.87? (pick one)

rewona [7]

Answer:

Ka = $4.04 \times 10^{-11}$

Explanation:

Initial concentration of weak acid = $4.5 \times 10^{-4}\ M$

pH = 6.87

$pH = -log[H^+]$

$[H^+]=10^{-pH}$

$[H^+]=10^{-6.87}=1.35 \times 10^{-7}\ M$

HA dissociated as:

$HA \leftrightharpoons H^+ + A^{-}$

(0.00045 - x) x x

[HA] at equilibrium = (0.00045 - x) M

x = $1.35 \times 10^{-7}\ M$

$Ka = \frac{[H^+][A^{-}]}{[HA]}$

$Ka = \frac{(1.35 \times 10^{-7})^2}{0.00045 - 0.000000135}$

0.000000135 <<< 0.00045

$Therefore, Ka = \frac{(1.35 \times 10^{-7})^2}{0.00045 } = 4.04 \times 10^{-11}$

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3 years ago

A neutral atom has the same number of _____ in it’s nucleus as____ in its electron cloud

rusak2 [61]

Answer:

the neutul atom has the same number of protons in its neclues as positive in its electron cloud#

Explanation:

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Iceland is an island nation right on the Mid Atlantic Ridge. On what type of boundary is Iceland located on?

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Iceland sits spanning the Mid-Atlantic Ridge tectonic plate boundary which separates the Eurasian and the North American plates.

Explanation:

Hope this helps!

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2 years ago

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Please help me 13 points​

Please help me 13 points