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3 years ago

Most bacteria are... 100 points!

Chemistry

2 answers:

xeze [42]3 years ago

8 0

Answer: A

Explanation:

JUST TOOK THE TEST

scoray [572]3 years ago

5 0

Bacteria and archaea are unicellular prokaryotes

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How many grams of cobalt (II) nitrate, Co(NO3)2, are required to make a 2.20%(w/v) aqueous solution in a 250 mL volumetric flask

shutvik [7]

Answer:

$\large \boxed{\text{5.50 g}}$

Explanation:

Percent means " per hundred," so % m/V means the grams of something in 100 mL of volume.

$\text{m/V \%} = \dfrac{\text{mass of solute} }{\text{volume of solution}} \times 100 \, \%$

Data:

m/V % = 2.20 %

V of solution = 250 mL

Calculations:

$\text{2.20 \%} = \dfrac{\text{mass of solute} }{\text{250 mL}} \times 100 \, \%\\\\\text{Mass of solute} = \dfrac{2.20\, \% \times \text{250 mL}}{100 \%} = \text{5.50 g}\\\\\text{The mass of Co(NO$_{3}$)$_{2}$ is $\large \boxed{\textbf{5.50 g}}$}$

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3 years ago

How many sex chromosomes do females have

MaRussiya [10]

Hello there!

Your answer is going to be 2. Females have two x chromosomes, while males have two as well, but males have an x and a y.

Hope this helps you! Feel free to ask for help anytime!

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3 years ago

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irina1246 [14]

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I think the family of Group 2 metals are most likely to form a 2+ion.

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