3 years ago

Which sign is NOT for a chemical change?

Chemistry

2 answers:

Alik [6]3 years ago

8 0

B is not a sign for chemical change

erastovalidia [21]3 years ago

8 0

Answer:c

Explanation:

You might be interested in

Suppose you held a lighted match to a solid hunk of wood and another match to a pile of wood shavings. Which form of wood will c

Reptile [31]

Answer:

Wood

Explanation:

0 0

3 years ago

3. Methyl acetate is hydrolyzed at 25 oC in acidic environment. Aliquots of equal volume are removed and titrated with NaOH solu

avanturin [10]

Solution :

Time (sec) Volume of NaOH (mL)

339 26.23

1242 27.80

2745 29.70

4546 3.81

$\infty$ 39.81

Now the example of the first order kinetics w.r.t volumetric analysis is :

$k=\frac{2.303}{t} \log \left(\frac{v_{\infty}-v_0}{v_{\infty}- v_t}\right)$

Here, $v_{\infty}= \text{ volume at }\infty = 39.81$

$v_{t}= \text{ volume at time 't' } = 27.80$

$v_0$ = volume at time 0 = 0

Since the interval is not constant, we take the time interval as

$=\frac{903+1503+1801}{3}$

$=\frac{4207}{3}$

= 1402.3333

≈ 1402 seconds

$k=\frac{2.303}{1402} \log \left(\frac{39.81-0}{39.81-27.80}\right)$

$=(0.001643) \log \left(\frac{39.81}{10.01}\right)$

= 0.001643 x 0.52045

= 0.00082

$= 8.55 \times 10^{-4} \ sec^{-1}$

Therefore, the first order rate constant is k $= 8.55 \times 10^{-4} \ sec^{-1}$ .

5 0

2 years ago

Something that has mass and volume; its made up of atoms

seropon [69]

Matter? all matter is made of atoms and has mass and volume. i think hope it helps

8 0

2 years ago

How do you find the molar mass for ba(NO3)2

Korvikt [17]

To find the molar mass of Ba(NO3)2, determine the molar masses of all the atoms that form it. The Molar mass for Barium nitrate is 261.337 g/mol.

8 0

3 years ago

Take the following out of scientific notation 3.74 x 10^7 Please help me

erastovalidia [21]

Answer:

37400000000 is the ans

5 0

3 years ago