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Novay_Z [31]
2 years ago
11

What organ system carries oxygen and food aoround the body for respiration

Chemistry
1 answer:
kiruha [24]2 years ago
8 0
<span>  mouth, pharynx, esophagus, stomach, liver, pancreas, small intestine, large intestine, nose, trachea, lungs,  and the heart xd  hope i helped</span>
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What element has 7 valence electrons
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I believe the answer would be halogens
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Can someone please help by filling out this table?
tamaranim1 [39]

Answer:

Lithium looses one electron.

The charge - Li^{+} - Cation

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Boron losses three electron.

The charge - B^{3+} - Cation

Explanation:

Lithium looses one electron.

The charge - Li^{+} - Cation

Nitrogen gains three electrons - Ni^{3-} - Anion

Boron losses three electron.

The charge - B^{3+} - Cation

The complete table is as follows.

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You need to make an aqueous solution of 0.237 M chromium(III) acetate for an experiment in lab, using a 500 mL volumetric flask.
julsineya [31]

Answer: 27.1 g of solid chromium(III) acetate should be added.

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

Molarity=\frac{n\times 1000}{V_s}

where,

n = moles of solute

V_s = volume of solution in ml

moles of Cr(CH_3COO)_3 = \frac{\text {given mass}}{\text {Molar mass}}=\frac{xg}{229g/mol}

Now put all the given values in the formula of molality, we get

0.237=\frac{xg\times 1000}{229g/mol\times 500ml}

x=27.1

Therefore, 27.1 g of solid chromium(III) acetate should be added.

3 0
3 years ago
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