Chapter 2 Chemistry of life

Electrons

Charged particles that move around an atom's nucleus are A electrons B protons C ions D neutrons

Enzyme

Chemical reactions can be sped up by adding an ______, which lowers the amount of acitivation engery required to start the reaction

Store and transmit hereditary information and gentic info

Describe the functions of the two types of nucleic acids, DNA and RNA

Totally True

The amount of engery needed to cause a chemcial reaction to start is called activation Engery

False

The atomic number of carbon is 6, so it must contain 12 electrons true or false

Atom

The basic unit of matter

C covalent bond

The bond formed when two atoms share a pair of electrons is called A. hydrogen bond B. nopolar bond C Covalent Bond D water bond

Polar Force

The bond that forms between polar molecules that have a positive end and a negative end

Nucleus

The center of an atom

Activation Engery

The energy needed to break existing chemical bonds during the initation of a chemical reaction is called___________

H+ ions in a solution

The ph scale is a measurment system that indicates the concentraion of ________ in a solution

True man this is so true

true or false Because water is a polar molecule, it tends to cause ionic compounds mixed in water to dissociate into ions

Covalent Bond

A bond that forms when electrons are shared between atoms

Ionic Bond

A bond that is formed when electrons are gained or lost by atoms

A reversible reaction

A chemcial reaction that can proceed forward or backward is A reversiable reaction B catalyst C ionic reaction D endergonic reaction

Solution

A combination of two or more substances in which the molecules are evenly distributed and cannot be seprated

Suspension

A mixture of water and non dissolved materials

D. Carbohydrate

A monosaccharide is a A. lipid B protein C Nucleic Acid D carbohydrate E All of the above are true

Electron

A negatively charged particle, that orbits outside the nucleus

Proton

A positively charged particle found in the nucleus

Element

A pure substance that consits of one type of atom

Basic

A solution with a ph of 11 is A. acidic B. Basic C neutral D buffer

b. basic

A solution with a ph of 11 is A. acidic B. Basic C neutral D. Buffer

C. Element

A substance that is composed of only one type of atom is called an A. nucleus B. cell C. Element D molecule

Compound/Bond

A substance that is formed when two elements come together in definite proportions

True

A substance with more of H+ ions than OH- ions is called acidic true or false

C atoms

All matter in the universe is composed of A cells B molecules C. atoms D carbon

A are driven by chemcial reactions

All of the activities occuring within the cells are A driven by chemcial reactions. B. Results from the random mixing of enzymes C. Causes the fluids in the cell to bubble or D results in production of enzymes

A Carbon

All organic compounds contain the element A.(C) B(N) C(Ca) D(Na)

B starch

All the following are lipids except A saturated fat B starch C cholesterol D earwax

Ion

An atom that has gained or lost an electon and now has an electric charge

C ion

An atom that has gained or lost electrons is called A Molecule B nucleon C Ion D element

Cohesion

An attraction between molecules of the same substance

Trues

Atoms in a gas move more rapidly than atoms in a liquid or solid do True or False

Isotope

Atoms of the same element that differ in the number of neutrons they contain

False, False False

Buffers can neutralize acids, but they do not affect bases

C are biological catalysts

Enzymes A. are able to heat up molecules so that they can react B. provide co2 for chemcial reactions C. are biological catalysts D. absorb excess heat so that reactions occur at low temperatures

True yep I it is True

Functional groups are side groups of carbon compounds that confer specific properties to these compounds True or False

D water expands when it freezes

Ice Floats on water because A of cohesion B ice has a higher density than water C. water shrinks when it freezes D. Water expands when it freezes

Electons

If an atom contains 15 protons, it muct contain 15___________

nonpolar molecules

Lipids are A polar molecules B similar to water molecules C protein molecules D nonpolar molecules

C oil

Lipids are soluble in A water B salt water C oil D all the above

B dna and rna

Nucleic Acids include A chlorphyll and retinal B dna and Rna C. lipids and sugars. D glucose and sugars

umm this is true

Organic compounds are substances produced and found in living things True or False

The answer issssss true

The prodcuts of an endergonic chemcial reaction possess more engery than the reactants from which they are produces true or false

Molecule

The structure that results when atoms are joined together by covalent bonds

EELECTRONS

The subatomic particles that makeup atoms are protons, neutrons and ____________________.

Solvent

The substance in which the solute dissolves

Solute

The substance that is being dissolved in a solution

All the Above are true

Water is important to life because it A. surrounds all cells B. is found inside cells. C. influences the shape of the cell membrane D All the above are totally true

All the above

Water molecules break up other polar substances, A. Such as sugars, B because of the uneven charge distribution that exists in water C. thus freeing ions in these substances for use by the body D. all the above

YES I am really true yes true

Without enyzmes, chemcial reactions necessary for life would not occur at a rate sufficient to sustain life True or False

T

Without enzymes, chemcial reactions necessary for life would not occur at a rate sufficient to sustain life

hydroxide, hydrogen

_____ and ____ ions form when water dissociates

water

______is the most common solvent in cells