Given parameters:
mass of an empty beaker = 65gm
mass of the beaker and water = 165gm
volume of water = 100cm³
Unknown:
Density of water = ?
Solution:
Density is the mass per unit volume of a substance;
Density =
To find the mass of the water ;
Mass of water = Mass of beaker and water - mass of an empty beaker
= 165g - 65g
= 100g
So input parameters and solve;
Density =
Density of the water in the beaker = 1g/cm³
Answer:
Resonance structures for the nitrate ion exist because there are more than one Lewis Structures for this ion.
Explanation:
How many bonds in each nitrate ion?
To answer this question, start by considering how many electrons each atom need for an octet.
- Each N atom needs three electrons to achieve an octet.
- Each O atom need two electrons to achieve an octet.
The three O atoms and one N atom in each nitrate ion will need electrons in total to be stable. However, the ion carries a charge of . In other words, atoms in the ion have already acquired one extra electron. Now they need only electrons.
Atoms share electrons by forming bonds. In effect, each chemical bond (a pair of shared electrons) adds two electrons to the bonding atoms. Atoms in the nitrate ion will form chemical bonds.
However, there are only three bonding position available. One of the three positions will see a double bond while each of the other two will see a single bond. However, the double bond can be at any of the three bonding position. There are thus three possible Lewis Structures. See the sketched. Note that the three structures are interconvertible by moving only the electrons but not any atoms. Hence the name resonance structures.
Keep in mind that in reality, the pi electrons from the double bond are delocalized across all three possible bonding positions. All three N-O bonds are of equal length.
Answer:
Protons, Neutrons, and Electrons are all in atoms so the one not present would be the Element since Elements are made of atoms.
Explanation:
Answer:
1. frequency = 7.39 * 10¹⁴ Hz
2. wavelength = 1.44 * 10⁸ nm
Explanation:
The speed, frequency and wavelength of waves are related by the formula;
speed = wavelength * frequency
1. wavelength of light = 406 nm = 4.06 * 10⁻⁷ m
speed of light is a constant = 3.0 * 10⁸ m/s
From the formula above, frequency = speed / wavelength
therefore, frequency = (3.0 * 10⁸ m/s) / 4.06 * 10⁻⁷ m
frequency = 7.39 * 10¹⁴ Hz
2. From the equation above, wavelength = speed/frequency
speed of radiation = 3.0 * 10⁸ m/s
frequency = 2.09 * 10⁹ Hz or 2.09 * 10⁹ s⁻¹
therefore, wavelength = (3.0 * 10⁸ m/s) / 2.09 * 10⁹ s⁻¹
wavelength = 1.44 * 10⁸ nm
To form CuO - 100 g of Copper reacts with 25 g of Oxygen
then amount of CuO formed - 125 g
Since excess oxygen is provided, Copper is the limiting reactant. Then Copper is completely consumed during the reaction and amount of product formed depends on the amount of Copper used.
So if 100 g of Copper makes up 125 g of CuO
Then 140 g of Copper will form - 125/100 x 140 = 175 g of CuO