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never [62]
3 years ago
5

Please. I really need these last two. It's a matter of passing or failing the class

Chemistry
1 answer:
andreyandreev [35.5K]3 years ago
6 0

Answer: 1st blank= Negitive 2= Positive

Explanation:

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(01.01 MC)
lys-0071 [83]

The answer would be option B "I believe there is life on other planets." Scientific statements have a possibility to be wrong. It's not option A because option A is a opinion. It's not option C because option C is a fact. It's not option D because option D is a opinion.

Hope this helps!

8 0
4 years ago
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Why was 1990 an important year regarding air quality?
Valentin [98]

Why was 1990 an important year regarding air quality? Check all that apply.

2.Cost-effective ways to reduce pollution were emphasized.


4.Modifications and improvements were made to the Clean Air Act.


i just took the test this is 100% correct

3 0
4 years ago
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What is the boiling point for water
drek231 [11]

Answer: 100 degrees Celsius and 212 degrees Fahrenheit.

3 0
3 years ago
You need to prepare an acetate buffer of pH 5.36 from a 0.900 M acetic acid solution and a 2.62 M KOH solution. If you have 680
Alexus [3.1K]

Answer:

Explanation:

pH = pKa + log [ CH₃COO⁻ ] / [CH₃COOH ]

5.36 = 4.86 + log [ CH₃COO⁻ ] / [CH₃COOH ]

log [ CH₃COO⁻ ] / [CH₃COOH ]  = .5

[ CH₃COO⁻ ] / [CH₃COOH ]  = 3.16

moles of CH₃COOH = .680 x .9 = .612 M

Let  x mole of KOH is required

x /( .612 - x ) = 3.16

x = 1.933 - 3.16 x

x = .46488

.46488 moles of KOH will be required

volume required be V

v x 2.62 =  .46488

v = .1774 L

= 177.4 mL

177.4 mL  of  2.62 M KOH will be required .

6 0
3 years ago
Thisss for you blake :)))
Lady_Fox [76]
I’m not Blake but ok
4 0
3 years ago
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