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3 years ago

Which list consists of elements that have the most similar chemical properties?

1 answer:

8 0

(2) Mg, Ca, and Ba have the most similar chemical properties, and we know this because of their coexistence in the group alkali earth metals (group 2) on the periodic table.

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Determine the number of molecules present in a 4.56 mol sample of methane gas (CH4); then determine the number of hydrogen atoms

AnnyKZ [126]

Avogadro’s number is 6.02 x 10^ 23 atoms (or molecules) per mole. Through units cancellation:

Number of atoms = (4.56 mol)( 6.02 x 10^23 molecules/ mol) = 2.74 x 10^ 24 molecules

Since the C:H ratio is 1:4, 1 molecule of CH4 will have 4 atoms of hydrogen,

Therefore number of H = 4 (2.74 x 10^24 molecules) = 1.098 x 10^ 25 atoms

6 0

3 years ago

An intravenous infusion is to contain 15 mEq of potassium ion and 20 mEq of sodium ion in 500 mL of 5% dextrose injection. Using

Studentka2010 [4]

Answer:

To supply the required ions it is necessary to inject 5,6mL of 6g/30mL solution and 131,1 mL of 0,9% solution.

Explanation:

1mEq of sodium are 59mg of NaCl and 1mEq of potassium are 75mg KCl

in intravenous infusion 15 mEq of K are:

15x75mg KCl = 1,125g of KCl

And 20 mEq of Na are:

20x59mg NaCl = 1,18g of NaCl

To supply the potassium ion it is necessary to inject:

1,125g of KCl× $\frac{30mL}{6g}$ = 5,6mL of 6g/30mL solution

And, to supply the sodium ion it is necessary to inject:

1,18g of NaCl× $\frac{100mL}{0,9g}$ = 131,1 mL of 0,9% solution

I hope it helps!

6 0

4 years ago

Jenny places a strip of pH paper into a solution. When she removes the pH paper, it has turned yellow-green.

Ronch [10]

Jenny puts the ph paper and lines it up PH SCALE to find how strong the solution.

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3 years ago

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Identify this reaction

Natasha2012 [34]

Answer:

d a a

Explanation:

brainliest plz

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3 years ago

Which of these items best describes the arrangement of electrons in an atom of sulfur? A. Eight electrons in its first energy le

Serga [27]

D. Two electrons in its first energy level; eight electrons in its second energy level; six valence electrons in its outermost energy level.

Please correct me if I'm wrong!! :)

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3 years ago

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