BIO102 ZB Quiz 2

The electron arrangement for argon, which has 18 electrons, is

2 in the inner energy shell, 8 in the second energy shell and 8 in the outer energy shell

Sulfur has an atomic number of 16. What would be the valence number of this element?

6

Some insects can stride on the surface of water because water

has surface tension.

The reactivity of an atom depends on

the number of valence electrons.

What property of water causes sugar to dissolve in coffee?

Water is a good solvent

Which of the following is not a contributing event in the formation of acid rain?

Fossil fuels consume oxygen removing it from the atmosphere.

Which of the following is not a property of water that results from hydrogen bonding?

Icw melts at -100 C

If average temperatures from South Dakota were compared to temperatures from Oregon it would show that Oregon has warmer winters and cooler summers than South Dakota does. What accounts for why this is when they are at similar latitudes?

The Pacific ocean makes Oregon temperatures more moderate.

Which of the following best describes the structure of how water molecules form and interact?

The oxygen atom and hydrogen atoms form a covalent bond with one another to create stable outer shells of electrons. The electrons are shared unequally resulting in a polar molecule whose slight charges form weak hydrogen bond attractions with other water molecules.

What do lemons, tomatoes, and coffee all have in common chemically?

They all produce (H+) in solution, making them acids.

Of the following examples which best demonstrates the property of water cohesion?

Water can move up a 100 foot pine tree from the roots to the leaves.

An ionic bond forms when

a negatively charged ion is attracted to one with a positive charge.

You are caring for the freshwater aquarium of a friend while they are on vacation. You are told to check the pH of the tank and make sure that it stays between 6.5 and 7.0. In order to ensure that you do not have to worry about the pH you

add a buffer so changes in pH are minimiz

Radioactive isotopes are useful in biological studies because

an organism will take in a molecule with the isotope and use it normally but the radioactive decay can be detected

Isotopes of an atom differ in their

atomic mass

All atoms of the same element have the same

atomic number.

Bases can

both take up hydrogen ions and release hydroxide ions.

Glucose, C6H12O6, is best described as a(n)

compound

Inside a living cell, which type of bond would be the most stable?

covalent

Engineers design city sidewalks using blocks of concrete separated by a small gap to prevent them from cracking. What property of water is being taken into account for this design? Water

is less dense when it is frozen.

The particles that are found in the nucleus of an atom are the

neutrons and protons

Why do cells need buffering agents?

o minimize the changes in pH of their internal environment

In the reaction 6CO2 + 6H2O → C6H12O6 + 6O2 carbon dioxide is one of the

reactants

Which of the following is a property of acids?

release hydrogen ions when dissolved in a liquid

After drinking a great deal of coffee (pH 5), a human's blood buffering system would need to ___ as the coffee was digested to lower the level of acid present in the blood stream.

take up H+