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Vesna [10]
3 years ago
8

Stone tools enabled people to hunt and grow crops made the food supply more

Chemistry
1 answer:
Nastasia [14]3 years ago
3 0
It makes it more accessible to everybody
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A buffer consists of 0.45 M CH3COOH (acetic acid) and 0.35 M CH3COONa. The Ka of acetic acid is 1.8 x 10-5 . a) Calculate the pH
Zigmanuir [339]

Answer:

A) pH of Buffer solution = 4.59

B) pH after 5.0 ml of 2.0 M NaOH have been added to 400 ml of the original    buffer solution = 4.65

Explanation:

This  is the Henderson-Hasselbalch Equation:

 pH = pKa + log\frac{[conjugate base]}{[acid]}

to calculate the pH of the following Buffer solutions.

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3 years ago
At top, Image 1 shows 2 C's connected by 2 lines. Each C is connected by single lines to 2 H's. At bottom, two dots and 12 C's i
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Answer: c

Explanation: Trust me

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M is a mysterious element whose molar mass is 141.0 g/mol. When combined with oxygen, the formula of the compound is M2O5. What
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I d k

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Blood, trail mix, and salad are all examples of ______________.
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homogeneous and heterogeneous mixtures

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How many moles are in 25.2g of KMnO4?
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When finding the moles in a compound you have to know the grams. In this case, 25.2 grams are given for KMnO4. To find the moles you would divide the amount of grams by the molar mass of KMnO4. The molar mass of KmnO4 is 158.034. You you would now divide 25.2 by 158.034 which is 0.15946 moles. Depending on how many decimal places the questions asks for is dependent on you. I just went with 5 significant figures. 
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