Bio 1- Chapter 2

C. K-41 has one more neutron than the normal K atom.

K-41 is one of the naturally occurring isotopes of potassium. Use the periodic table to explain how the structure of K-41 differs from the normal K atom. A. K-41 has a total of 2424 neutrons and normal K atom has 2222 neutrons. B. K-41 has a total of 2222 neutrons and normal K atom has 20 neutrons. C. K-41 has one more neutron than the normal K atom. D. K-41 has one less neutron than normal K atom

B. calculated mean of the mass number for an element's isotopes

Define atomic mass in your own words. A. total number of protons in an atom B. calculated mean of the mass number for an element's isotopes C. total number of protons and neutrons in an atom D. statement of a chemical reaction with the number of each type of atom equalized for both the products and reactants

Ionic bond involves the transfer of electrons whereas covalent bond involves the sharing of electrons.

What makes ionic bonds different from covalent bonds?

A. The soda will be ineffective because it is acidic and the person's upset stomach is being caused by excessive stomach acid.

A person with an upset stomach drank a soda in an attempt to settle it down. What prediction can be made about how well the soda will work? A. The soda will be ineffective because it is acidic and the person's upset stomach is being caused by excessive stomach acid. B. The soda will temporarily settle the person's stomach, but then it will become even more upset. C. The soda will cause the buffers within the stomach to activate, reducing the amount of stomach acid being produced. D. The soda will settle the person's stomach because it contains a basic solution that will counteract the acid.

C. the ability to combine and to chemically bond with each other

Define chemical reactivity in your own words. A. statement of a chemical reaction with the number of each type of atom equalized for both the products and reactants. B. process leading to the rearrangement of atoms in molecules C. the ability to combine and to chemically bond with each other D. interaction between two or more of the same or different atoms that results in the formation of molecules

C. the ability to combine and to chemically bond with each other.

Define chemical reactivity in your own words. A. statement of a chemical reaction with the number of each type of atom equalized for both the products and reactants. B. process leading to the rearrangement of atoms in molecules. C. the ability to combine and to chemically bond with each other. D. interaction between two or more of the same or different atoms that results in the formation of molecules

A. intermolecular forces between water molecules caused by the polar nature of water; responsible for surface tension.

Define cohesion in your own words. A. intermolecular forces between water molecules caused by the polar nature of water; responsible for surface tension. B. attraction between water molecules and other molecules. C. separation of individual molecules from the surface of a body of water, leaves of a plant, or the skin of an organism D. tension at the surface of a body of liquid that prevents the molecules from separating; created by the attractive cohesive forces between the molecules of the liquid

C. steady state of relative reactant and product concentration in reversible chemical reactions in a closed system.

Define equilibrium in your own words. A. movement of electrons from one element to another; important in creation of ionic bonds. B. the ability to combine and to chemically bond with each other. C. steady state of relative reactant and product concentration in reversible chemical reactions in a closed system. D. statement of a chemical reaction with the number of each type of atom equalized for both the products and reactants

D. Diabetic ketoacidosis decreases normal pH (7.35-7.45) to a lower value.

One of the risks for people with diabetes is diabetic ketoacidosis, a build-up of acid in the blood stream. Explain why this is dangerous to humans. A. Diabetic ketoacidosis decreases the normal pH (8.35-8.45) to a lower value. B. Diabetic ketoacidosis increases normal pH level of blood disrupting biological processes. C. Diabetic ketoacidosis keeps pH level of blood constant which disrupts biological processes. D. Diabetic ketoacidosis decreases normal pH (7.35-7.45) to a lower value.

C. A Bohr model would have 2 electron rings, and a Bohr model would not show the sub-shell of second ring

Use the periodic table to describe what a Bohr model of Fluorine (F) would look like and explain why the Bohr model is not an accurate representation of the electron orbitals in fluorine. A. A Bohr model would have 2 electron rings, and a Bohr model would not give information about atomic mass. B. A Bohr model would have one electron ring, and a Bohr model would not show the sub-shells of first ring C. A Bohr model would have 2 electron rings, and a Bohr model would not show the sub-shell of second ring D. A Bohr model would have one electron ring, and a Bohr model would not give information about number of electron in each ring

C. Only 4 percent of the total water on earth is freshwater, out of which 68 percent is found in glaciers

Water takes up 333 million cubic miles on Earth, yet access to drinking water is a critical issue for many communities around the world. Explain why this is so. A. Drinking water is only obtained by rain water harvesting. B. Only 4 percent of the total water on earth is freshwater which is found only in glaciers. C. Only 4 percent of the total water on earth is freshwater, out of which 68 percent is found in glaciers. D. Drinking water is only obtained by desalination treatments of salt water found on earth.

D. a hydrophobic functional group is not soluble in water, so it can affect the internal functioning of cells.

What is the importance to a biological system of a functional group being hydrophobic? A. Being hydrophobic makes a molecule polar, so it will dissociate completely when immersed in water. B. The water makes the functional group hydrophobic, so it cannot bind properly to carbon chains. C. Having hydrophobic functional groups prevents hydrophilic ones from attaching to certain organic molecules. D. a hydrophobic functional group is not soluble in water, so it can affect the internal functioning of cells.

A. Ionic bond involves the transfer of electrons whereas covalent bond involves the sharing of electrons.

What makes ionic bonds different from covalent bonds? A. Ionic bond involves the transfer of electrons whereas covalent bond involves the sharing of electrons. B. Ionic bond involves the van der Waals force of interaction whereas covalent bond involves the sharing of electrons. C. Ionic bond involves the sharing of electrons whereas a covalent bond involves the transfer of electrons. D. An ionic bond involves the transfer of electrons whereas a covalent bond involves the van der Waals force of interaction.

A. Structural isomers share a chemical formula but differ in the placement of their covalent bonds.

Which of the following statements about organic molecules is true? A. Structural isomers share a chemical formula but differ in the placement of their covalent bonds. B. Geometric isomers have different chemical formulas but similar bond structures. C. Functional groups are any group of atoms that contains carbon. D. Organic molecules consist of atoms that provide or impart a specific function to a carbon skeleton.

A. The amount of energy required to change one gram of liquid water to a gas is lower than most other substances.

Which of the following statements about the properties of water is false? A. The amount of energy required to change one gram of liquid water to a gas is lower than most other substances. B. The amount of heat one gram of water must absorb to increase its temperature by one degree Celsius is higher than most other common liquids on Earth. C. Water is capable of dissolving polar molecules and ionic compounds because water has slightly positive and slightly negative charges. D. The surface of liquid water can withstand being ruptured when placed under pressure due to hydrogen bonding.

E. Polar substances such as sugars are hydrophilic.

Which of the following statements about the properties of water is true? A. Water has a lower pH than acids and a higher pH than bases. B. Insects can use the water property of adhesion to walk on water. C. Non-polar substances such as oils are hydrophilic. D. water has a lower pH than both acids and bases. E. Polar substances such as sugars are hydrophilic.

D. Ionic bonds are generally stronger than covalent bonds except in aqueous solutions.

Which of the following statements is false? A. Electrons are unequally shared in polar covalent bonds. B. Electrons are equally shared in nonpolar covalent bonds. C. Hydrogen bonds are weak bonds based on electrostatic forces. D. Ionic bonds are generally stronger than covalent bonds except in aqueous solutions.

A. Poke the object with a stick to see if it exhibits any type of behavior.

You are a visitor to another planet. During your explorations, you come across an object you have never seen before. You are uncertain if the object is alive or not. Which method of experimentation would be best to show if a newly found object would be considered living (using Earth's standards)? A. Poke the object with a stick to see if it exhibits any type of behavior. B. Count the number of different pieces that comprise the object. C. place some food near the object to see if it gets eaten within a short period of time. D. See if there are other samples of the object close by to determine how it reproduces.