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ira [324]
3 years ago
9

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!!
5 0
3 years ago
Read 2 more answers
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

8 0
3 years ago
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