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Ivahew [28]
3 years ago
14

Which is a characteristic of calcium?

Chemistry
1 answer:
posledela3 years ago
4 0
The answer is D
Calcium has two electrons in its outer energy shell
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Convert 92.92 g NaOH to moles
user100 [1]

Answer:

It would be 2.323167848877082

Explanation:

3 0
3 years ago
Periods on the periodic table represent elements ______.
hoa [83]

Answer:

B:with increase in number of valence electrons

Explanation:

As we move from left to right across the periodic table the number of valance electrons in an atom increase. The atomic size tend to decrease in same period of periodic table because the electrons are added with in the same shell. When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction. The electrons are pull towards the nucleus and valance shell get closer to the nucleus. As a result of this greater nuclear attraction atomic radius decreases and ionization energy increases because it is very difficult to remove the electron from atom and more energy is required.

7 0
4 years ago
Which sample was an alkane​
ch4aika [34]
Methane, propane, ethane, and butane are four alkanes.
3 0
3 years ago
A 3.31-g sample of lead nitrate, pb(no3)2, molar mass = 331 g/mol, is heated in an evacuated cylinder with a volume of 2.11 l. t
bearhunter [10]

The equation in this problem is: 2Pb(NO3)2(s) --> 2PbO(s) + 4NO2(g) + O2(g)

And the question is what the pressure in the cylinder is after decomposition and cooling to a temperature of 300 K.

 

Solution:

Moles of Pb (NO3)2 = 3.31/331 = 0.0100 

2 moles of Pb (NO3)2 will decay to mold 4 moles of NO2 and 1 mole of O2. So 0.0100 moles of Pb (NO3)2 will form 0.02 moles of NO2 and 0.00500 moles of O2 

Then use the formula: PV = nRT. 

P = (0.02 + 0.005) * 0.082 * 300 / 1.62 

= 0.380 atm

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7 0
3 years ago
What is the molarity of a solution of 1/2 mol of cu(no3)2 in 1/2 L water
sweet [91]
Molarity is mole divided by volume in litres.
0.5mol divide by 0.5L = 1M
6 0
4 years ago
Read 2 more answers
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