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Mandarinka [93]
3 years ago
5

Can anyone help with number 8.

Chemistry
1 answer:
Stels [109]3 years ago
7 0
A tornado! I think or it could be rain
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How are a carrot, an amoeba, and a bacterium alike?
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Answer:

They all are made up of cells

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3 years ago
A 2.17 gm sample barium reacted completely with water what is the equation for the reaction how many milliliters of dry H2 evole
vaieri [72.5K]

Answer:

400 mL

Explanation:

Given data:

Mass of barium = 2.17 g

Pressure = 748 mmHg (748/760 = 0.98 atm)

Temperature = 21 °C ( 273+ 21 = 294k)

Milliliters of H₂ evolved = ?

Solution:

chemical equation:

Ba + 2H₂O →  Ba(OH)₂ + H₂

Number of moles of barium:

Number of moles = mass/ molar mass

Number of moles = 2.17 g / 137.327 g/mol

Number of moles = 0.016 mol

Now we  will compare the moles of barium with H₂.

                       Ba        :       H₂

                         1         :         1

                  0.016        :     0.016

Milliliters of H₂:

PV = nRT

V = nRT/P

V = 0.016 mol ×  0.0821 atm. mol⁻¹.k⁻¹.L×294 k/0.98 atm

V = 0.39 atm. L/0.98 atm

V = 0.4 L

L to mL

0.4 × 1000 = 400 mL

8 0
3 years ago
A mixture of iron and sulfur can be separated by A.magnetic attraction
Elenna [48]
A. Magnetic attraction
6 0
3 years ago
Will vote brainliest and 5 star
svetoff [14.1K]

Answer:

it is B

Explanation:

hope it helps you

4 0
3 years ago
5. True or False: If one thing in a food web is affected, it will only probably affect the organism that directly relies on it f
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A because if something happened to that organism then the organism relying on it will either go extinct or just die out due to starvation
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3 years ago
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