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pantera1 [17]
3 years ago
7

What metalic element is sometimes used in flarres and flashbulbs

Chemistry
1 answer:
hjlf3 years ago
7 0
Magnesium bc it burns a bright light when used
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How many atoms are in 163 g of calcium?
I am Lyosha [343]
<span>Avogadro's number represents the number of units in one mole of any substance. This has the value of 6.022 x 10^23 units / mole. This number can be used to convert the number of atoms or molecules into number of moles.

163 g Ca (1 mol / 40.08 g) ( </span>6.022 x 10^23 atoms / 1 mol ) = 2.45 x10^24 atoms Ca
8 0
3 years ago
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When the body becomes overheated, how does the body react to maintain homeostasis?
erastovalidia [21]

Answer:

Nervous system directs your body to swear to release heat.

Explanation:

Sweat maintains homeostasis when overheating.

4 0
2 years ago
How many moles of oxygen molecules are present in 112ml of co2 at NTP?​
dexar [7]

In each mole of carbon dioxide there will be one mole of O₂.

Let us calculate the moles of carbon dioxide gas present first

The conditions are NTP it means , Temperature = 293 K and P = 1 atm

We will use ideal gas equation

PV= nRT

Where

P = Pressure of gas = 1 atm

V= 112mL=0.112L

R= gas constant =0.0821 L atm /mol K

n = moles = ?

Putting values

moles=\frac{PV}{RT}=\frac{1X0.112}{0.0821X293}

moles = 0.00466

Thus moles of carbon dioxide will be 0.00466

The moles of O₂ = 0.00466

7 0
3 years ago
Which atoms will bond when valence electrons
sergij07 [2.7K]
Since Oxygen is in group 16, this element has 6 valence electrons. Valence electrons like to become as stable as possible and similar to a noble gas, which has 8 electrons. You need to find an element that will transfer its atoms to the oxygen to make 8 electrons. Looking at the periodic table, Selenium is in group 16 and will have 6 valence electrons (6 + 6 = 12). This can't transfer electrons with Oxygen. Hydrogen is in group 1 with 1 valence electron (6 + 1 = 7). This can't transfer electrons with Oxygen. Strontium is in group 2 with 2 valence electrons (6 + 2 = 8). This will transfer electrons to Oxygen, making it the most stable.

The answer is O and Sr. 
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Z u need help with this assignment​
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Answer:

Explanation:

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