Where is the ion charge located in the isotope symbol?
Answers
Final answer:
In an isotope symbol, the ion charge is generally indicated at the top right corner, so if you have a calcium ion with a +2 charge, the symbol would be Ca²⁺.
Explanation:
In an isotope symbol, the ion charge is generally indicated at the top right corner. The isotope symbol typically includes the atomic number on the lower left, the atomic symbol in the middle, and the mass number on the upper left. If there is an ion charge, it will be indicated on the upper right of the symbol. Suppose you have an ion with a +2 charge, like a calcium ion, it's symbol would be Ca²⁺.
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During the reproduction of a species of butterflies, a mutation occurs that makes the offspring more visible to predators. Is this a positive or negative mutation? How do you predict this mutation will affect the long term survival of the species? Justify your response in two or more complete sentences.
Answers
Answer:
Explanation:
Half life is the time taken to reduce the original concentration of the reactants to half.
Now, the number of half lives is related to the amount left after decomposition by the formula:
where,
a = amount of reactant left after n-half lives = ?
= Initial amount of the reactant
n = number of half lives = 5
Putting values in above equation, we get:
Thus the amount of sample that remains after 5 half lives is of original amount.
Answers
Answer:
16.27 g of CaCO3 are produced upon reaction of 45 g CaCN2 and 45 g of H2O.
Explanation:
Ca(CN)2 + 3H2O → CaCO3 + 2 NH3
First of all, let's find out the limiting reactant.
Molar mass Ca(CN)2.
Molar mass H2O: 18 g/m
Moles of Ca(CN)2: mass / molar mass
45 g / 92.08 g/m = 0.488 moles
Moles of H2O: mass / molar mass
45g / 18g/m = 2.50 moles
This is my rule of three
1 mol of Ca(CN)2 needs 3 moles of H2O
2.5 moles of Ca(CN)2 needs (2.5 . 3) / 1 = 7.5 moles
I need 7.5 moles of water, but I only have 0.488. Obviously water is the limiting reactant; now we can work on it.
3 moles of water __ makes __ 1 mol of CaCO3
0.488 moles of water __ makes ___ (0.488 . 1) / 3 = 0.163 moles
Molar mass CaCO3 = 100.08 g/m
Molar mass . moles = mass
100.08 g/m . 0.163 moles = 16.27 g
Water freezes
Titanium is less dense than iron
Iodine ( a purple solid) becomes a purple gas
Answers
Answers
Final answer:
To calculate the number of grams of copper (Cu) in 2.55 mol of Cu, multiply the number of moles by the molar mass of copper. The molar mass of Cu is 63.55 g/mol. Therefore, there are 162.05 grams of copper (Cu) in 2.55 mol of Cu.
Explanation:
To calculate the number of grams of copper (Cu) in 2.55 mol of Cu, we need to use the molar mass of copper. The molar mass of Cu is 63.55 g/mol. Therefore, 2.55 mol of Cu is equal to:
2.55 mol Cu × 63.55 g/mol = 162.05 g Cu
So, there are 162.05 grams of copper (Cu) in 2.55 mol of Cu.
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-group
-length
-strength
The answer is *strength*
Answers
Answer:
Strength
Explanation:
Lattice energy is the energy needed to remove one mole of ionic substance to its gaseous ion.
The lattice energy is used to determine the strength of a substance.
- Lattice energy increases as the size of an ion decreases.
- It decreases as the ion size increases.
- This quantity is often determined using electrostatics method in the laboratory
- The lattice energy is used to break an ionic solid to form a gaseous compound.
Lattice energy is an estimate of the strength of the bond because lattice energy is a measure of the strength of the electrostatic forces holding ions together in an ionic compound's crystal lattice. So the correct option is D.
D. strength
Lattice energy is the energy required to completely separate one mole of an ionic compound into its individual gaseous ions. In other words, it measures the strength of the forces that hold the ions together in the crystal lattice. Lattice energy is typically expressed in energy units per mole, such as kilojoules per mole (kJ/mol).
Factors Influencing Lattice Energy:
1. Charge of Ions: Greater charge on ions leads to stronger attractions and higher lattice energy.
2. Ionic Radius: Smaller ionic radii lead to higher lattice energy. When ions are smaller, they can get closer to each other in the crystal lattice, resulting in stronger electrostatic attractions.
3. Distance between Ions: Lattice energy increases as the distance between ions decreases. Closer ions experience stronger attractions.
4. Electron Configuration: The arrangement of electrons affects the effective nuclear charge felt by the ions. Ions with more stable electron configurations (e.g., noble gas configurations) have higher lattice energies.
Lattice energy plays a crucial role in determining the stability and properties of ionic compounds. It influences properties such as melting and boiling points, hardness, solubility, and the overall stability of the compound. Compounds with higher lattice energies tend to have higher melting points and are less likely to dissociate into ions in solution.
Therefore, lattice energy is a measure of the strength of the electrostatic forces holding ions together in an ionic compound's crystal lattice. It's influenced by factors such as ion charges, ionic radii, and distance between ions.
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chemically balance the following:
____ Mg(OH)2 + __ HCl → ____ MgCl2 + __ H2O
____ CH4 + ____ O2 → _____ CO2 + ____ H2O
___ Cu + ___ Br2 → ___ CuBr2
Answers
second one - CH4+2O2– 2H20
Third- is already balanced.