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padilas [110]
3 years ago
5

The use of more advanced tools made of stone, wood, and bone, such as the ones illustrated below, was typical of which period of

human history?
a. Paleolithic era
b. Neolithic era
c. Bronze Age
d. Iron Age
Chemistry
1 answer:
Sedbober [7]3 years ago
6 0
Paleolithic Era
During the Paleolithic Era, early humans used mostly stone tools but at times also used wood or bone tools.
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Answer:

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Explanation:

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Reaction of acetylene with silver nitrate​
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You need to prepare 1 L of the citric acid/citrate buffer. You have chosen to use Method 1 (see lab presentation). Calculate the
prisoha [69]

Answer:

3.11 is the pH of the buffer

Explanation:

The pH of a buffer is obtained using H-H equation:

pH = pKa + log [Conjugate base] / [Weak acid]

<em>Where pH is the pH of the buffer, pKa = -log Ka = 3.14 for the citric buffer and [] could be taken as the moles of each species.</em>

The citric acid,HX (Weak acid), reacts with NaOH to produce sodium citrate, NaX (weak base) and water:

HX + NaOH → H2O + NaX

That means the moles of NaOH added = Moles of sodium citrate produced

And the resulitng moles of HX = Initial moles - Moles NaOH added

<em>Moles HX and NaX:</em>

Moles NaOH = 0.100L * (0.65mol / L) = 0.065 moles NaOH = Moles NaX

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Replacing in H-H equation:

pH = 3.14 + log [0.065mol] / [0.070mol]

pH = 3.11 is the pH of the buffer

8 0
3 years ago
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3 years ago
Is the maximum population that a given area can support
Anastaziya [24]

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Carry capacity

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Hope this helps

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8 0
3 years ago
Read 2 more answers
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