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3 years ago

What is anything that has mass and volume

Chemistry

2 answers:

Korvikt [17]3 years ago

6 0

Matter is what makes up all of the objects and living organisms in the universe. Anything that has mass takes up space.

Pavlova-9 [17]3 years ago

3 0

Anything that has mass and volume (takes up space) is called matter.

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A monoprotic weak acid, HA , dissociates in water according to the reaction:

Ratling [72]

<u>Answer:</u> The $pKa$ of the acid is 6.09

<u>Explanation:</u>

For the given chemical reaction:

$HA(aq.)\rightleftharpoons H^+(aq.)+A^-(aq.)$

The expression of equilibrium constant [tex[(K_a)[/tex] for the above equation follows:

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

We are given:

$[HA]_{eq}=0.200M$

$[H^+]_{eq}=4.00\times 10^{-4}M$

$[A^-]_{eq}=4.00\times 10^{-4}M$

Putting values in above expression, we get:

$K_a=\frac{(4.00\times 10^{-4})\times (4.00\times 10^{-4}}{0.200}\\\\K_a=8.0\times 10^{-7}0$

p-function is defined as the negative logarithm of any concentration.

$pKa=-\log(K_a)$

So,

$pKa=-\log(8.0\times 10^{-7})\\\\pKa=6.09$

Hence, the $pKa$ of the acid is 6.09

7 0

4 years ago

A fossil is found to have a 14 C 14C level of 70.0 70.0 % compared to living organisms. How old is the fossil?

natulia [17]

Answer:

The age of the fossil be $2.1987\times 10^{4} years$ .

Explanation:

Formula used :

$N=N_o\times e^{-\lambda t}\\\\\lambda =\frac{0.693}{t_{\frac{1}{2}}}$

where,

$N_o$ = initial mass of isotope C-14 = x

N = mass of the parent isotope left after the time, (t) = 70.0% of x=0.07x

$t_{\frac{1}{2}}$ = half life of the isotope C-14 = 5730 years

$\lambda$ = rate constant

Let the age of the fossil be t.

Now put all the given values in this formula, we get t :

$0.07x=x\times e^{-(\frac{0.693}{5730 years})\times t}$

$t=2.1987\times 10^{4} years$

The age of the fossil be $2.1987\times 10^{4} years$ .

8 0

3 years ago

Galvanic cell runs on the following reaction: Al (s) + Fe3+ (aq) → Al3+ (aq) + Fe (s) Draw a diagram for this Galvanic cell, lab

MAVERICK [17]

See image for details.

5 0

4 years ago

Which statement about the fossil record is correct?

lubasha [3.4K]

The answers is the last answer choice!!

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3 years ago

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Ions form as a result of uneven charge distribution between the nucleus and the electron cloud. TRUE OR FALSE

storchak [24]

Answer:

true

Explanation:

true

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3 years ago