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Marrrta [24]
2 years ago
6

Which of the following is a chemical change?

Chemistry
1 answer:
JulijaS [17]2 years ago
8 0
The answer is D, carbon and oxygen reacting to form carbon dioxide.
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The pH of an acid solution is 5.82. Calculate the Ka for the monoprotic acid. The initial acid concentration is 0.010 M.
blagie [28]

Answer:

The answer is

<h3>Ka = 2.29 \times  {10}^{ - 14} moldm^{ - 3}</h3>

Explanation:

The Ka of an acid when given the pH and concentration can be found by

<h3>pH =  -  \frac{1}{2}  log(Ka)  -  \frac{1}{2}  log(c)</h3>

where

c is the concentration of the acid

From the question

pH = 5.82

c = 0.010 M

Substitute the values into the above formula and solve for Ka

We have

<h3>5.82 =   - \frac{1}{2}  log(Ka)  -  \frac{1}{2}  log(0.010)</h3><h3 /><h3>-  \frac{1}{2}  log(Ka)  = 5.82 + 1</h3><h3 /><h3>-  \frac{1}{2}  log(Ka)  = 6.82</h3>

Multiply through by - 2

<h3>log(Ka)  =  - 13.64</h3>

Find antilog of both sides

We have the final answer as

<h3>Ka = 2.29 \times  {10}^{ - 14} moldm^{ - 3}</h3>

Hope this helps you

8 0
3 years ago
Order the levels of organization from the smallest (1) to the largest (4).
yKpoI14uk [10]

Answer:

cells=1

organ=3

organ system=4

tissue=2

Explanation:

i just did the question right now and i got them all correct.

3 0
3 years ago
What is the density of an object that has a mass of 21 g and a volume of 9 ml?
mylen [45]

The formula is density = mass / Volume

density = ?

mass = 21 g

Volume = 9 mL

d = m / V

d = 21 g / 9 mL

d = 2.3 g/mL

Hope this help!


5 0
2 years ago
Mutations that neither benefit nor harm the organism have (blank) effect on the organisms survival
Daniel [21]

Answer:

I would say that the mutation has no effect on the organism, as it doesn't help or harm it.

hope this helps :)

Explanation:

3 0
3 years ago
Read 2 more answers
Can you help me with three please? We’re balancing electrons
Aneli [31]

Answer:

Explanation:

I did this class yesterday give me like 10min imma find my anwsers

4 0
2 years ago
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