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3 years ago

The formula for a compound containing sodium and oxide ions would contain... This

Chemistry

2 answers:

ahrayia [7]3 years ago

7 0

Negative
Explaintion.

max2010maxim [7]3 years ago

6 0

Answer:

Explanation:

the formula of the compound containing sodium and oxide ion is

NaOH the charge on sodium is partial positive and the charge on hydroxide ion is partial negative

another compound containing sodium and oxide ion is Na2O here the charge on sodium oxide is neutral

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A rock with a mass of 70 grams is dropped into a graduated cylinder with 30 mL of water in it. The water level rose to 35 mL cal

Scilla [17]

Answer:

Explanation:

70g/(35mL-30mL)=14g/mL

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3 years ago

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If I have 12 protons, how many neutrons and electrons would I need to make a stable atom?

lesantik [10]

Answer:

im pretty sure you need 15 in all but dont get mad it thats wrong, so you would i think need 3 neutrons

Explanation:

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3 years ago

The values associated with the term, standard state, in a thermochemical system are__________.

charle [14.2K]

Answer:

The values associated with the term, standard state, in a thermochemical system are option c

Explanation:

Temperature: 0.00 °C; pressure: 1.000 standard atmosphere

Otherwise you can write 0°C as 273 K

1 atm as 1.01325 bar, or 1013 mbars

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3 years ago

6. There are three isotopes of silicon. They have mass numbers of 28, 29 and 30. The average atomic mass of silicon is 28.086amu

Elza [17]

Answer:

That means that the isotope that has a mass number of 28 is probably the most abundant. This is because your average atomic mass is 28.086 amu, which is closest to 28.

Formula used to calculate average atomic mass follows:

average atomic mass=(atomic mass of an isotope)*(fractional abundance)

we are given=

Three isotopes of Silicon, which are Si-28, Si-29 and Si-30.

Average atomic mass of silicon = 28.086 amu

As, the average atomic mass of silicon is closer to the mass of Si-28 isotope. This means that the relative abundance of this isotope is the highest as compared to the other two isotopes.

Percentage abundance of Si-28 isotope = 92.2%

Percentage abundance of Si-29 isotope = 4.7 %

Percentage abundance of Si-30 isotope = 3.1%

Hence, the abundance of Si-28 isotope is the highest as compared to the other isotopes.

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3 years ago

How many moles are in 230 grams of calcium phosphate

alexgriva [62]

Answer: 0.74 moles

Explanation:

The first step is to figure out the chemical formula for calcium phosphate. Since we know that calcium is a metal, this will be an ionic bond. Calcium is written as Ca and has a charge of +2. Phosphate is written as PO4 with a charge of -3. To come up with the subscripts for this formula, cross the charges. That means that you will get $Ca_{3} (PO_{4} )_{2}$ .

Next, calculate how many grams one molecule of calcium is. Calcium has an atomic weight of 40, and there are 3 molecules of calcium, so 40 x 3 = 120. Phosphorus has an atomic weight of 31, and there are 2 molecules of phosphorus, so 31 x 2 = 62. Oxygen has an atomic weight of 16, and there are 8 molecules of oxygen, so 16 x 8 = 128. Adding all of those together gives you 310 g.

Now, using stoichiometry, we can figure out the question. We know that there are 230 grams. We also know that one mole weighs 310 g. If you divide 230 by 310, you will get your answer, which is 0.74 moles.

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3 years ago

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