<span>Salt compounds are composed of ions that form a tightly packed and ordered network, which is called a crystal lattice. It is held together by electrostatic forces known as ionic bonding. Ionic bonding refers to the chemical bond between two oppositely charged ions - a cation and an anion. This type of bond forms when there is a large electronegativity difference between two atoms. </span>
If I'm correct, the crater is actually a circular-shaped area around the volcano's central vent. My answer is false
Answer:
1) -COOH
2) -NH2
3) hydrogen bonds
4) dispersion forces
5) -CH3
6) hydrogen bonds
7) negative
8) negative
9) positive
Explanation:
Alanine has a <u>-COOH</u> and a <u>-NH2</u> group available to form <u>hydrogen bonds</u> with water molecules.
Although there are some potential <u>dispersion forces</u> between the terminal <u>-CH3</u> group of alanine and hexane molecules, we expect the <u>hydrogen bonds</u> between alanine and water to be stronger.
Stronger intermolecular attractive forces between alanine and water lead to a more <u>negative ΔHmix</u> and more <u>negative (smaller positive)</u> ΔHsoln for water than for hexane.
No. You shouldn't place materials that have toxic fumes because it can get in people's lunges through breathing.
The answers are:
- natural abundance: 60.108%
- atomic mass: 68.926 amu
The atomic mass of an element is the average of the atomic masses of its isotopes. The relative abundance of isotopes must be taken into consideration, therefore:
atomic mass of copper = atomic mass of isotope 1 * abundance 1 + atomic mass of isotope 2 * abundance 2
We know:
atomic mass of copper = 69.723 <span>amu
</span>The atomic mass of Ga-71 is: 70.925 amu
The abundance of Ga-69 is: 39.892% = 0.39892
The atomic mass of Ga-69 is: x
The abundance of Ga-69 is: 100% - 39.892% = 60.108% = 0.60108
Thus:
69.723 amu = 70.925 amu * 0.39892 + x * 0.60108
69.723 <span>amu = 28.293 amu + 0.60108x
</span>⇒ 69.723 amu - 28.293 amu = 0.60108x
⇒ 41.430 amu = 0.60108x
⇒ x = 41.430 amu ÷ 0.60108 = 68.926 amu
