Unit 2.1 - 2.2 (Nature of Life + ABC)

What are the subatomic particles of an atom?

• nucleus, membrane, DNA

• protons, electrons, neutrons

• covalent, ionic, hydrogen bonds

• negative, positive, zero

The 6 most common elements that make up 99% of living things are:

• Carbon, oxygen, potassium, nitrogen, hydrogen, and calcium

• Carbon, oxygen, potassium, hydrogen, calcium, and magnesium

• Carbon, oxygen, calcium, hydrogen, phosphorus, and nitrogen

• Carbon, oxygen, magnesium, calcium, salt, and nitrogen

Interactions that give a molecule its chemical properties are known as:

• intramolecular interactions

• stable interactions

• identifying interactions

• intermolecular interactions

Which of the main types of interactions is BOTH intramolecular AND the strongest?

• ionic

• van der Waals

• hydrogen bonds

• covalent

In order for van der Waals forces to be effective in holding molecules together, the molecules must be:

• close together & polar

• ionic & charged

• close together & geometrically aligned

• next to each other & side by side

Which of the following is an example of a compound?

• H2 gas (hydrogen gas)

• O2 (oxygen gas)

• CO (carbon monoxide)

• Cl2 (chlorine gas)

Why might an electron not be found in the same exact place at all times?

• Electrons can go wherever they want, so it’s impossible to predict their location

• Electrons are in constant motion around the nucleus, so they shift location frequently

• Electrons carry a negative charge, so they are unstable and never follow a pattern of movement

• Electrons are tiny, so they would be really difficult to locate

What does a scientist look at to determine how many atoms of each element are present in a chemical compound?

• the chemical formula

• the periodic table of elements

• the number of valence electrons

• the coefficients

Hydrogen bonds occur between:

• The (δ-) of an Oxygen atom and the (δ+) of a Hydrogen atom

• The (δ+) of an Oxygen atom and the (δ-) of a Hydrogen atom

• The (δ+) of a Hydrogen atom and the (δ+) of another Hydrogen atom

• The (δ-) of an Oxygen atom and the (δ-) of another Oxygen atom

______________ result from covalent bonds ; _________________ result from ionic bonds

• polarity; charged particles

• molecules; ions

• ions; molecules

• compounds; charges