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stellarik [79]
3 years ago
10

Which of the following choices represents a balanced chemical equation? A. Ca3(PO4)2 + 6SiO2 → P4O10 + 3CaSiO3 B. 2Ca3(PO4)2 + 6

SiO2 → P4O10 + 6CaSiO3 C. 2Ca3(PO4)2 + 3SiO2 → 2P4O10 + 2CaSiO3 D. 3Ca3(PO4)2 + 2SiO2 → P4O10 + 4CaSiO3
Chemistry
1 answer:
Arturiano [62]3 years ago
6 0

 the correct answer: 2Ca3(PO4)2 + 6SiO2 -> P4O10 + 6CaSiO3

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Suppose 1.87g of nickel(II) bromide is dissolved in 200.mL of a 52.0mM aqueous solution of potassium carbonate.
Reika [66]

Answer:

0.0428 M

Explanation:

Because we're asked to calculate the molarity of nickel(II) cation, we need to <u>determine all sources for that species</u>, in this case, all Ni⁺² comes from the nickel(II) bromide solid (NiBr₂).

We use the molecular weight of NiBr₂ to calculate the moles of Ni:

1.87 g NiBr₂ ÷ 218.49g/mol * (1molNi⁺²/1molNiBr₂) =  8.55x10⁻³ mol Ni⁺²

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7 0
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I believe the percent yield is 55%.
6 0
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The sum of pH and pOH for any aqueous solution equals .
Vsevolod [243]

Answer:

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Explanation:

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3 years ago
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ss7ja [257]

Incomplete question. Full question reads;

Darwin developed the theory of evolution to explain why there are so many different kinds of living things. He could easily observe that offspring of any animals were slightly different from their parents and that this could allow for big changes over thousands of years. He did not know that genes caused the differences. Genes are now very important in the modern theory of evolution.

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<u>new experiments involving genes and evolution </u>

<u>Explanation:</u>

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3 0
3 years ago
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