lesson 3 test review

Will detergents form micelles like arrangement #1 or #2? (3.7 Learn:Molecular Properties)

1

In the above representation, what does it mean that the left atom has a larger oval than the right atom? (3.5 learn: Electronegativity)

A larger oval indicates that an atom unequally pulls electrons toward itself

Intermolecular attractions pull molecules together This kind of attraction is the result of which kind of force/attention: (3.4 learn: Polarity)

Both polar and non-polar

which is a stronger bond?(3.3 Investigation: Mixing Oil and water)

Chemical bonds(between atoms)

which type of bond is stronger? (3.3 investigation: Mixing Oil and water)

Dipole- Dipole Attractions

Attraction between Oxygen and Hydrogen atoms in a water molecules is an example of: (3.3 Investigation:Mixing Oil & water)

Dipole-Dipole Attractions

Water alone can remove oil from birds.(3.2 learn:Detergents)

False

Attraction between oil and water molecules is called: (3.3 Investigation:Mixing Oil and water)

London Dispersion Forces

How is the behavior of detergent different from the polar and nonpolar molecules? (3.6 learn: How Detergent Work)

The detergent molecules are able to interact with both polar and nonpolar molecules where as polar and nonpolar molecules are only able to interact with other molecules that have the same polarity.

In the above representation, what does it mean that the left atom is blue and the right atom is red? (3.5 learn: Electronegativity)

The different colors indicate different charges in a chemical bond

Common household detergents include soaps,shampoos, and dish detergent.(3.2 learn:Detergent)

True

In polar covalent bonds, there is a difference between the electronegativities of the atoms bonded. Therefore, the electronegative atom. (3.5 Learn: Electronegativity)

True

Polar molecules, like water have both positive & negative regions. (3.5 Learn: Electronegativity)

True

A nonpolar and nonpolar substances will usually ____ when mixed. (3.5 learn: Electronegativity)

dissolve

A polar and polar substance will usually ____ when mixed. (3.5 Learn: Electronegativity)

dissolve

Which one of the molecules in the image is polar? How do you know? (3.6 Learn: How Detergent Work)

green; because they did not interact with the nonpolar oil.

Covalent bonds are forces that hold atoms together within molecules This piece of evidence points to covalent bonds having which properties:(3.4 Learn: Polarity)

neither polar nor nonpolar

Oil is ______ because it does not have charged regions. (3.5 learn: Electronegativity)

non-polar

Grease is hard to remove from your hands without soap/detergent. This piece of evidence points to detergent having which properties: (3.4 learn: Polarity)

non-polar properties only

Oxygen- Oxygen bond Hydrogen=2.10 Carbon=2.55 Chlorine=3.16 Oxygen=3.44 Fluorine=3.98 Sodium=0.93 ( 3.5 Learn: Electronegativity)

nonpolar

Oil molecules do not have charged regions and will not mix with water. This piece of evidence points to detergent having which properties: (3.4 learn: Polarity)

only non-polar

Sodium-Chlorine bond Hydrogen=2.10 Carbon=2.55 Chlorine=3.16 Oxygen=3.44 Fluorine=3.98 Sodium=0.93 (3.5 Learn: Electronegativity)

polar

Charged water molecules are slightly attracted to each other. This piece of evidence points to water having which properties:(3.4 learn:Polarity)

polar only

Water is slightly positively charged and slight negatively charged. This piece of evidence points to water having which properties:(3.4 learn:Polarity)

polar only

A polar and non polar substance will usually ______ when mixed (3.5 Learn: Electronegativity)

separate

Which of the following molecular structures could be a detergent? (3.7 Learn: Molecular Properties)

structure 2

Detergents will not form micelles like arrangement #2 because there is not a strong intermolecular attraction between the polar part of the detergent and the nonpolar oil molecules. The polar part of detergent would be more attached to the polar water molecules like in arrangement 1.(3.7 Learn:Molecular properties)

true

You will be trying to figure out how detergents can help clean oil spills. In order to do so, you will need to..(3.2 learn:Detergents)

•Example why water alone can't remove oil from birds •Explain how these molecular properties can help remove oil •Indicate the molecular properties of detergents