Geocentric-Ptolemy, Aristotle
Heliocentric- Copernicus, Galileo, heliocentric
Answer:
The exact result is 82.5 min (close to c. 80 min)
Explanation:
Hello,
In the following picture you'll find the numerical procedure for this exercise.
- Take into account that the initial concentration and the velocity constant remain constant for the two mentioned scenarios.
Best regards.
Answer:
Ionic.
Explanation:
Elements with higher electronegativity values are better at attracting electrons in a chemical bond.
- A chemical bond is considered "ionic" if the electronegativity difference between the two bonding atoms is greater than
. - Otherwise, this chemical bond is considered "covalent".
In this example, the difference between the electronegativity of oxygen and lithium is
. Since
, the bond between the two elements would likely be ionic.
It is possible to reach the same conclusion based on the fact that lithium is a metal while oxygen is a nonmetal. When metal elements react with non-metal elements, the product is typically an ionic compound- with ionic bonds between the atoms.
Answer is: d. Mg3N2.
Mg₃N₂ is magnesium nitride.
Nitrogen (nonmetal) in this chemical compound has oxidation number -3 and magnesium (metal) has oxidation number +2.
Smallest common multiple for 3 and 2 is 6.
number of nitrogen atoms = 6 ÷ 3.
number of nitrogen atoms = 2, there are two nitrogen atoms.
number of magnesium atoms: 6 ÷ 2.
number of magnesium atoms = 3.
Q=MCdeltaT
*make sure you change celcius into Kelvin*
Q=20(4.18)(20)
Q=1,672
It requires 1,672 Joules