A magnifying glass is an example of a _______ lens.a. plano-convex
b. plano-concave
c. converging
d. double-concave

Answer:

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Explanation:

An element's chemical properties are determined by the number ofelectrons .

How do  electrons determine chemical properties?

The number of electrons determine chemical properties of an atom as they are present in equal number outside the nucleus as that of protons .Protons contribute to the mass of an atom and give an identity to an atom .

As protons are positively charged there is a need to balance this positive charge and it is balanced by an equal number of electrons .As the valence electrons are the electrons which take part in chemicalreactions the element's chemical properties are determined  by the number of electrons.

The number of neutrons has a negligible effect on the chemical nature of elements as they are neutral and have no charge.Indirectly, it's the electronic configuration of an element which determines the chemical properties of any element.

To learn more about chemical properties of elements click here:

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Answer : The molar volume of the gas will be, 44.82 L

Solution :

Using ideal gas equation,

where,

n = number of moles of gas  = 1 mole

P = pressure of the gas = 0.5 atm

T = temperature of the gas = 273 K

R = gas constant = 0.0821 Latm/moleK

V = volume of the gas.

Now put all the given values in the above equation, we get the molar volume of the gas.

Therefore, the molar volume of the gas will be, 44.82 L

Answer:

To balance the chemical equation, I'll assume the reaction is carried out under standard conditions. Here's the balanced equation:

2 N2 (g) + 5 O2 (g) → 4 H2O (l) + 4 NO3- (aq)

Explanation:

To balance the number of nitrogen (N) atoms, we need 2 nitrogen molecules (N2) on the left side. This gives us a total of 4 nitrogen atoms on the left side.

To balance the number of oxygen (O) atoms, we need 5 oxygen molecules (O2) on the left side. This gives us a total of 10 oxygen atoms on the left side.

On the right side, we need 4 water molecules (H2O) to balance the hydrogen (H) atoms. This gives us a total of 8 hydrogen atoms on the right side.

Finally, to balance the oxygen (O) atoms on the right side, we need 4 nitrate ions (NO3-) since each nitrate ion contains one nitrogen and three oxygen atoms. This gives us a total of 12 oxygen atoms on the right side.

Now the equation is balanced with 4 nitrogen atoms, 10 oxygen atoms, 8 hydrogen atoms, and 4 nitrate ions on both sides.