The silver reacted with the oxygen in the air, this chemical reaction caused it to tarnish.
B I think idk sorry if it’s wrong
Answer:
8,588,461,537
Explanation:
Since the atoms are arranged in a straight line in contact with each other what we have to do is divide the length into the diameter of copper (2r) to obtain the number of atoms in the 223.3 cm of copper wire, and from there we can figure how many times we wil have to divide it to answer our question.
diameter = 2 x( 1.3 x 10⁻¹⁰ m) = 2.6 x 10⁻¹⁰ m
The number of diameters in 223.3 cm ( 2.233 m ) which is the number of atoms in this length:
2.233 m / 2.6 x 10⁻¹⁰ m/atom = 8,588,461,538 atoms
So we will have to divide it 8,588,461,537 ( one minus because we want to sepate 8,588,461,538 atoms )
This is a problem where we have to work with integers and not decimals since we can not speak for example of 0.5 individual atoms
Answer: "The reactants are higher in energy than the products"
Explanation:
The exothermic reactions are characterized by the release of heat to the surroundings. The reactants lose heat that is delivered to the surroundings which implies that the products will be lower in energy than the reactants.
The hills that you can see in a reaction energy diagram are not related with the final change of energy. The hills are an indication of the activation energy needed to start the reaction, but they do not measure the change of energy from the products to the reactants.
The enthalpy that is a state variable that identifies the content of heat. Then the change of enthalpy for the exothermic reactions is negative, meaning that the energy of the products is lower than the energy of the reactants.
Step 1: add electrons to fill the 1s subshell (maximum of 2 electrons), when this is full, go to step 2. Step 2: add electrons to fill the 2s subshell (maximum of 2 electrons), when this is full, go to step 3. Step 3: add electrons to fill the 2p subshell (maximum of 6 electrons), when this is full, go to step 4. Step 4: add electrons to fill the 3s subshell (maximum of 2 electrons), when this is full, go to step 5. Step 5: add electrons to fill the 3p subshell (maximum of 6 electrons), when this is full, go to step 6. Step 6: add electrons to the 4s subshell (maximum of 2 electrons), when this is full, go to step 7. Step 7: add electrons to the 3d subshell (maximum of 10 electrons), when this is full, go to step 8. Step 8: add electrons to the 4p subshell (maximum of 6 electrons), when this is full, go to step 9. etc
So for Cu would be: 1s^22s^22p^63s^23p^63d^9
Ag would be: 1s^22s^22p^63s^23p^63d^104s^24p^64d^105s^1
Au would be: 1s^22s^22p^63s^23p^63d^104s^24p^64d^105s^25p^64f^145d^106s^1