3 years ago

Name two elements whose outer energy levels are complete with two electrons

Chemistry

1 answer:

cluponka [151]3 years ago

4 0

Answer:

ppsuck

Explanation:

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A hard-water solution contains 4.8 g of calcium chloride. How much sodium phosphate in grams should be added to the solution to

alexgriva [62]

Answer:

4.7 g

Explanation:

The reaction that takes place is:

3CaCl₂(aq) + 2Na₃PO₄(aq) → Ca₃(PO₄)₂(s) + 6NaCl(aq)

First we convert 4.8 g of CaCl₂ into moles, using its molar mass:

4.8 g ÷ 110.98 g/mol = 0.0432 mol CaCl₂

Then we convert CaCl₂ moles into Na₃PO₄ moles, using the stochiometric coefficients of the balanced reaction:

0.0432 mol CaCl₂ * $\frac{2molNa_3PO_4}{3molCaCl_2}$ = 0.0288 mol Na₃PO₄

Finally we convert 0.0288 moles of Na₃PO₄ into grams, using its molar mass:

0.0288 mol Na₃PO₄ * 164 g/mol = 4.7 g

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3 years ago

In the periodic table, similar acting items are found in

natita [175]

C. both rows and collumns

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3 years ago

The pitch of a sound is related to its frequency amplitude

valina [46]

Answer:

The pitch of a sound is related to its frequency.

Explanation:

The higher the frequency, the higher the pitch will be

Amplitude is related to how loud a sound is

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3 years ago

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Which statement best describes chemical properties of matter? Chemical properties, such as density, must be observed when a subs

alisha [4.7K]

Chemical properties of matter can only be observed and measured by performing a chemical change.
- Density and boiling are not chemical changes.
- This leaves reactivity and combustion. Reactivity does not need to be observed at STP so the statement is wrong.

Combustion is the best answer.

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4 years ago

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The balanced equation for the combustion of Hexane,C6H14 , is

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Answer:

$2C _{6}H _{14} + 19O _{2}→12CO _{2} +14H _{2} O$

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3 years ago