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Masja [62]
3 years ago
5

What is the electron configuration of the calcium ion?

Chemistry
1 answer:
olga2289 [7]3 years ago
3 0
The electron configuration Is [AR]4s2
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Classify each process according to direction of heat flow.
MrRissso [65]

Answer:

heat flows in

heat flows out

heat flows out

Explanation:

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3 years ago
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What conditions must be present for a rock to turn into a metamorphic rock
Brut [27]
Igneous that can be changed by heat and pressure which can change the form of the rock
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A student isolated 25 g of a compound following a procedure that would theoratically yield 81 g. Wht was his percentt yield?
Sati [7]

<u>Answer:</u> The percent yield of the compound is 30.86 %.

<u>Explanation:</u>

To calculate the percentage yield of a compound, we use the equation:

\%\text{ yield}=\frac{\text{Experimental yield}}{\text{Theoretical yield}}\times 100

Experimental yield of compound = 25 g

Theoretical yield of compound = 81 g

Putting values in above equation, we get:

\%\text{ yield of compound}=\frac{25g}{81g}\times 100\\\\\% \text{yield of compound}=30.86\%

Hence, the percent yield of the compound is 30.86 %.

3 0
4 years ago
From a laboratory process, a student collects 28.0 g of hydrogen and 224.0 g of oxygen. how much water was originally involved i
nikklg [1K]

Chemical reaction is given as :

2H_{2}O\rightarrow 2H_{2}+O_{2}

Here, 2 moles of water gives 2 moles of hydrogen and one mole of oxygen.

Mass of hydrogen =  28.0 g (given)

Mass of oxygen = 224.0 g (given)

Number of moles = \frac{given mass}{molar mass}

Thus, number of moles of hydrogen = \frac{28 g}{2\times 1 g/mol}

= 14 moles of hydrogen

Number of moles of oxygen= \frac{224 g}{2\times 16 g/mol}

= 7 moles of oxygen

Now, to find the amount of water:

7 mol of oxygen \times (\frac{2 mol of water}{1 mol of oxygen})\times (18 g/mol of water)

= 252 g of water.

Thus, amount of water is 252 g (involved in the process).






4 0
4 years ago
How much did you pay if an item with an original price of $43.43 has a 20% discount?
Zigmanuir [339]

Answer:

Original price: $

54.29

Discount percentage:

20

%

Explanation:

CUZ I AM A CAHIER FOR MC DONALDS JK ITS CUZ I AM SMART.

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