Answer:
A NaCl: ionic (Na is metal and Cl is not metal)
B. AIC13: ionic (Al is metal and Cl is not metal)
C. C2H3N: covalent (C, H and N are nonmetals)
D. C3H60: covalent (C and H are nonmetals)
E. BaCl2: ionic (Ba is metal and Cl is not metal)
F. CaCl2: ionic (Ca is metal and Cl is nonmetal)
Explanation:
In ionic bonds, they are formed when there is a difference in electronegativity, between metals and nonmetals. In the case of covalent bonds, one or more pairs of electrons are shared between nonmetal compounds.
Answer:
Vapor pressure of solution = 111.98 Torr
Explanation:
Colligative property to apply: Lowering vapor pressure
P° - P' = P° . Xm . i
P°, vapor pressure of pure solvent
P', vapor pressure of solution
Xm, mole fraction of solute
i, Van't Hoff factor.
Let's determine the Xm.
Moles of solute = mass / molar mass → 34.2 g / 58.45 g/mol = 0.585 moles
Moles of solvent = 375 g / 18 g/mol = 20.83 moles
Mole fraction = 0.585 mol / 0.585 mol + 20.83 mol → 0.0273
Let's replace the data in the formula:
118.1 Torr - P' = 118.1 Torr . 0.0273 . 1.9
118.1 Torr - 6.12 Torr = P'
Vapor pressure of solution = 111.98 Torr
Answer:
Matter can be classified according to
physical and chemical properties. Matter is anything that occupies space and has mass. The three states of matter are solid, liquid, and gas. ... Pure substances can be either chemical compounds or elements.
Answer: Slightly acid, almost neutral.
pOH = -log [OH -] = - log [4.2 x 10^-8] = 7.38
pH + pOH = 14 ==> pH = 14 - pOH = 14 - 7.38 = 6.62.
Remember: 7 is neutral, below 7 is acid. This solution is almost neutral.
