ch 2

An isotope of carbon (C-14) has an atomic mass of 14 and an atomic number of 6. How many neutrons does it have? 6 5 7 8

8 =(14-6)

proton

A subatomic particle that has +1 charge

neutron

A subatomic particle that has 0 charge

electron

A subatomic particle that has a -1 charge

isotope

DIFF number of neutrons but SAME number of protons

In cellular respiration, the sugar glucose (C6H12O6) is oxidized. Do the atoms in this molecule lose energy or gain energy during this reaction? lose energy gain energy

LOSES energy (Exergonic, and Catabolic)

hydroPHOBIC

NONPOLAR molecules NOT attracted to water molecules

A change in a solution from a pH of 4 to a pH of 7 represents _______________ in the hydrogen ion concentration by a factor of ______. a decrease, 100 an increase, 1000 an increase, 100 a decrease, 2 an increase, 2 a decrease, 1000

a decrease, 1000

chemical equation- C6H12O6+6O2-->6CO2+6H20+ATP For the following response DO NOT include the ATP molecule. a. How many carbon atoms are in the reactants? b. How many carbon atoms are in the products? c. Name the reactant with carbon atoms d. Name the product with carbon atoms. a. 6, b. 6, c. glucose, d. carbon dioxide a. 12, b. 6, c. carbon dioxide, d. glucose a. 1, b. 6, c. glucose, d. carbon dioxide a. 6, b. 6, c. carbon dioxide, d. glucose

a. 6 b. 6 c. glucose d. carbon dioxide

If a tomato puree mixture has a hydrogen concentration of 1 x 10-4 M, it has a pH of 4. This substance is _______. acidic neutral basic

acidic

ion

atom or chemical group that DOES NOT have same number of protons/electrons

________________ of water is responsible for surface tension. High specific heat Cohesion Low polarity Adhesion High heat of vaporization

cohesion

A covalent bond is formed by the sharing of _______ between atoms, whereas an ionic bond is formed by the _______. electrons; transfer of electrons from one atom to another electrons; electric attraction between two neutral atoms protons; transfer of electrons from one atom to another protons; electric attraction between two neutral atoms

electrons, transfer of electrons from one atom to another

Which type of bond represents the WEAKEST chemical bond? polar covalent bond non-polar covalent bond hydrogen bond

hydrogen bonds

Which of the following molecules are hydrophilic? Select ALL that apply. hydrogen ion sodium ion glucose molecular oxygen (oxygen gas) methane

hydrogen ion sodium ion glucose

Which of the following changes would INCREASE the rate of a chemical reaction? Select ALL that apply. increase temperature add a catalyst remove a catalyst increase concentration of reactant decrease temperature decrease concentration of reactant

increase temp add a catalyst increase concentration of reactant

chemical bonds

intersection between atoms which result in formation of molecules

hydrophilic

ions or POLAR molecules ATTRACTED to water molecules

Which of the following is NOT one of the elements that makes of up over 96% of living tissue? Hydrogen Carbon Nitrogen Oxygen Iron

iron

Which of the following forms of H2O is has the HIGHEST DENSITY? water vapor solid water (ice) liquid water

liquid water

atomic number

number of protons in an element

Which of the following statements is false? water has the ability to form ice that floats and can insulate the water below. water has a high heat of vaporization water has the ability to dissolve polar solutes. water has the capacity to form hydrogen bonds. water has low specific heat capacity.

water as low specific heat capacity

Name the molecules in this image b. Name the bonds represented by the dashed lines c. Name the bonds represented by the straight lines water, hydrogen, polar covalent carbon dioxide, ionic, polar covalent carbon dioxide, hydrogen, polar covalent water, hydrogen, nonpolar covalent carbon dioxide, ionic, nonpolar covalent

water, hydrogen, polar covalent