Test
Sci Chap 2
Crea una cuenta gratis para terminar este test
Guarda tu progreso y consulta tu resultado final.
¿Ya tienes cuenta? Inicia sesión
Preguntas del test (122)
1The basic unit of matter is called a(an)
- Aatom
- Bnucleus
- Celectron
- Dion
2The subatomic particles that make up atoms are (select all)
- Aprotons
- Bneutrons
- Celectrons
- Datoms
- Eions
3Protons are _______ charged particles
- Apositive
- Bnegative
- Chave no charge
4Neutrons have what kind of charge
- Apositive
- Bnegative
- Ccarry no charge
5Strong forces bind protons and neutrons together to form the
- Aelectrons
- Bnucleus
- Cion
- Dmolecule
6The electron is a ______ charged particle
- Apositive
- Bnegative
- Chas no charge
7Correct answer for number 1 on chart
- Aproton
- Belectron
- Cnucleus
- Dneutron
8Correct answer for number 2 on chart
- Aproton
- Bneutron
- Cnucleus
- Delectron
9Correct answer for number 3 on chart
- Aproton
- Belectron
- Cnucleus
- Dneutron
10Correct answer for number 4 on chart
- Astrong forces bind them with neutrons to form the nucleus
- Bstrong forces bind them with electrons to form the nucleus
- Cin constant motion in the space around the nucleus
11Correct answer for number 5 on chart
- Astrong forces combine them with protons to form the nucleus
- Bstrong forces combine them with electrons to form the nucleus
- Cthey are in constant motion in the space surrounding the nucleus
12Correct answer for number 6 on chart
- Astrong forces bind them with protons to make the nucleus
- Bstrong forces bind them with neutrons to make the nucleus
- Cin constant motion in the space surrounding the nucleus
13atoms are neutral because (2 answers)
- Athey have equal numbers of electrons and protons
- Bthey have different numbers of electrons and protons
- Ctheir subatomic particles have equal but opposite charges
- Dtheir subatomic particles have the same charges
14a pure substance that consists entirely of one type of atom
- Achemical element
- Bisotopes
- Ccompound
- Dmolecule
15Elements are represented by
- Aone letter symbol
- Bone or two letter symbol
- Cone number
- Done or two numbers
16Carbon's atomic number is 6 which means
- Aeach atom of carbon has six protons and six electrons
- Beach atom of carbon has six protons and twelve electrons
- Ceach atom of carbon has six protons and six neutrons
- Deach atom of carbon has six protons
17Atoms of an element can have different numbers of neutrons. For example, some atoms of carbon have six neutrons, some have seven, and a few have eight.
- AVerdadero
- BFalso
18An atom of an element that has a number of neutrons different from that of other atoms of the same element is known as a(n)
- Aisotopes
- Bcompound
- Cmolecule
- Dion
19The sum of the protons and neutrons in the nucleus of an atom is called its
- Amass number
- Biconic bond
- Cmolecule
- Datom
20The weighted average of the masses of an element's isotopes is called its
- Amass number
- Batomic mass
- Cnucleus
- Disotope
21Because they have the same number of electrons, all isotopes of an element have the
- Asame chemical properties
- Bdifferent chemical properties
22Some isotopes are radioactive, meaning that their nuclei are unstable and break down at a constant rate over time.
- AVerdadero
- BFalso
23A substance formed by the chemical combination of two or more elements in definite proportions is known as a
- Amolecule
- Bpolymer
- Ccompound
- Denzyme
24The physical and chemical properties of a compound are usually very different from those of the elements from which it is formed.
- AVerdadero
- BFalso
25A chemical formula indicates the composition of a(an)
- Aisotope
- Bcompound
- Celement
26The atoms in compounds are held together by
- Achemical bonds
- Bionic bonds
- Cions
- Da molecule
27The electrons that are available to form bonds are called
- Avalence protons
- Bvalence electrons
- Cvalence neutrons
28The main types of chemical bonds are
- Aionic bonds and covalent bonds
- Batomic bonds and ionic bonds
- Celectrons and ionic bonds
- Dcompound bonds and covalent bonds
29An atom that loses electrons has a
- Apositive charge
- Bnegative charge
- Cno charge or neutral charge
30An atom that gains electrons has a
- Apositive charge
- Bnegative charge
- Cno charge or neutral charge
31Positively and negatively charged atoms are known as
- Aions
- Bisotopes
- Cnucleus
- Dcatalyst
32This forms when electrons are shared between atoms
- Aionic bonds
- Bcovalent bonds
- Cmolecule
- Dcohesion
33Check each sentence that is true about covalent bonds
- AWhen atoms share two electrons, it is called a double bond.
- BIn a water molecule, each hydrogen atom forms a single
covalent bond. - CAtoms can share six electrons and form a triple bond.
- DIn a covalent bond, atoms share electrons.
34The slight attractions that develop between oppositely charged regions of nearby molecules are called
- Aionic bonds
- Bvan der Waals forces
- Ccatalyst
- Dadhesion
35The particles that move around the nucleus of an atom are called
- Aneutrons.
- Bprotons.
- Celectrons.
36How many neutrons does the isotope carbon-14 have? (hint: they have 6 protons and 6 electrons)
- A6
- B8
- C14
37Geckos are able to grip smooth vertical surfaces as a result of
- Avan der Waals forces
- Bionic bonds
- Ccovalent bonds
38A water molecule is polar because there is an _________ distribution of electrons between the oxygen and hydrogen atoms.
- Aeven
- Buneven
39In a water molecule the negative pole is near the
- Aoxygen atom
- Bhydrogen atom
- Cneither of the choices
40In a water molecule the positive pole is near the
- Aoxygen atom
- Bhydrogen atom
- Cneither of the answers
41Water molecules are attracted to each other because of their
- Aability to form covalent bonds.
- Bability to form ionic bonds.
- Cpartial positive and negative charges.
42attraction between molecules of the same substance
- Acohesion
- Badhesion
- Ccatalyst
- Dactive site
43attraction between molecules of different substances; in plants, attraction between unlike molecules
- Acohesion
- Badhesion
- Corganic
- Dsubstrate
44Cohesion and adhesion are similar in that
- Aboth help bond water molecules to each other.
- Bboth cause water to rise in narrow tubes.
- Cboth are attractions between molecules.
45A material composed of two or more elements or compounds that are physically mixed together but not chemically combined.
- Acompound
- Belement
- Cmixture
- Dsolution
46Two types of mixtures that can be made with water are
- Asolutions
- Bmixture
- Celements
- Dsuspensions
47mixture of two or more substances in which the molecules of the substances are evenly distributed
- Asolution
- Bsolute
- Csolvent
- Dsuspension
48substance that is dissolved in a solvent to make a solution
- Asolution
- Bsolute
- Csolvent
- Dsuspension
49substance in which a solute is dissolved to form a solution
- Asolution
- Bsolute
- Csolvent
- Dsuspension
50In a salt solution, what happens to sodium and chloride ions?
- AThey stay near the original salt crystal.
- BThey become evenly dispersed in the water.
- CThey bond with each other, forming a new salt crystal.
51mixture of water and nondissolved materials
- Asolutions
- Bsolute
- Csolvent
- Dsuspensions
52measurement system used to indicate the concentration of hydrogen ions (H+) in solution; ranges from 0 to 14
- Aacids
- Bbase
- Cbuffers
- DpH scale
53compound that forms hydrogen ions (H+) in solution
- Aacid
- Bbase
- Cbuffers
- DpH scale
54Basic, or alkaline, solutions contain lower concentrations of H+ ions than pure water and have pH values above 7.
- AVerdadero
- BFalso
55weak acid or base that can react with strong acids or bases to help prevent sharp, sudden changes in pH
- Aacids
- Bbases
- Cbuffers
- DpH scale
56A molecule in which the charges are unevenly distributed is called a
- Apolar molecule
- Bcohesive molecule
- Chydrogen molecule
57A dissolved substance is called a
- Asolvent
- Bsolution
- Csolute
58A compound that produces hydroxide ions in solution is called a
- Abase
- Bbuffer
- Cacid
59unequal sharing of electrons
- Apolarity
- Bacidic
- Cbasic
60lemon juice, pH 1.5
- Apolarity
- Bacidic
- Cbasic
61lower concentrations of H ions than pure water
- Apolarity
- Bacidic
- Cbasic
62ammonia, pH 11.5
- Apolarity
- Bacidic
- Cbasic
63a slight negative charge at one end of a molecule, a
slight positive charge at the other end- Apolarity
- Bacidic
- Cbasic
64pH values that are below 7
- Apolarity
- Bacidic
- Cbasic
65alkaline solutions
- Apolarity
- Bacidic
- Cbasic
66This is the study of all compounds that contain bonds between carbon atoms.
- Aorganic chemistry
- Bcompound chemistry
- Cionic chemistry
- Dcohesion chemistry
67How many valence electrons does each carbon atom have
- A2
- B4
- C8
68What gives carbon the ability to form chains that are almost unlimited in length?
- Acarbon atom can bond to other carbon atoms
- Bcarbon atom can bond to other hydrogen atoms
- Cthey can't form chains
69Many of the molecules in living cells are so large that they are known as
- Aenzymes
- BMacromolecules
- Cproduct
- Dmonomers
70Macromolecules are formed by a process known as
- Amonosaccharide
- Bdisaccharide
- Cpolymerization
- Dsubstrate
71small unit that can join together with other small units to form polymers
- Amonomers
- Bpolymonomers
- Cmacromolecules
- Dadhesions
72large compound formed from combinations of many monomers
- Apolymerization
- Bmacromolecules
- Cpolymers
- Dcohesion
73Four groups of organic compounds found in living things are
- Acarbohydrates
- Benzyme
- Clipids
- Dnucleic acids
- Eions
- Fprotiens
74Polymerization results in the formation of
- Amonomers
- Bpolymers
- Celements
75The monomers in a polymer are like the
- Alinks in a chain.
- Bbonds in a molecule
- Celectrons in an atom
76compound made up of carbon, hydrogen, and oxygen atoms; major source of energy for the human body
- Alipids
- Benzymes
- Ccarbohydrates
- Dmonosaccharides
77Living things use this as their main source of energy and plants and some animals also us this for structural purposes.
- Alipids
- Bnucleur acids
- Cproteins
- Dcarbohydrates
78Starches and sugars are examples of ________ that are used by living things as a source of energy.
- Aproteins
- Bcarbohydrates
- Clipids
- Denzymes
79single sugar molecule
- Apolysaccharide
- Bmonosaccharide
- Cdisaccharide
- Dmonomer
80Check each sentence that is true about carbohydrates
- AStarches and sugars are examples of carbohydrates.
- BLiving things use them as their main source of energy.
- CThe monomers in sugar polymers are starch molecules.
- DPlants and some animals use them for strength and rigidity.
81Check each of the monosaccharide
- Agalactose
- Bglycogen
- Cglucose
- Dfructose
82They are large macromolecules formed from monosaccharides.
- Amonosaccharides
- Bnucleotides
- Cpolysaccharides
- Dcarbohydrates
83Plants use a polysaccharide called _______ to store excess sugar.
- Aglucose
- Bglycogen
- Cplant startch
- Denzymes
84 animals use a polysaccharide called _________ to store excess sugar.
- Aplant startch
- Bglucose
- Cglycogen
- Denzymes
85macromolecule made mainly from carbon and hydrogen atoms; includes fats, oils, and waxes
- Acarbohydrates
- BNucleic acids
- CProteins
- DLipids
86What are three common categories of lipids (check three)
- Afats
- Bsugar
- Coils
- Dwaxes
87Many lipids are formed when a glycerol molecule combines with compounds called
- Aplant startch
- Bfatty acids
- Cenzymes
- Dions
88Check each way that fats are used in living things.
- AAs parts of biological membranes
- BTo store energy
- CTo give plants rigidity
- DAs chemical messengers
89The term _____________ is used because the fatty acids contain the maximum possible number of hydrogen atoms.
- Asaturated
- Bunsaturated
90If there is at least one carbon-carbon double bond in a fatty acid, the fatty acid is said to be
- Asaturated
- Bunsaturated
91macromolecule containing hydrogen, oxygen, nitrogen, carbon, and phosphorus
- ANucleic acids
- Blipids
- Ccarbohydrates
- Dproteins
92monomer of nucleic acids made up of a 5-carbon sugar, a phosphate group, and a nitrogenous base
- Alipids
- Bpolynucleotide
- Cnucleotides
- Dmonosaccharide
93Nucleic acids store and do not transmit genetic information.
- AVerdadero
- BFalso
94The three parts of a nucleotide are
- Aa 6-carbon sugar, a phosphate group, and a nitrogenous base.
- Ba 5-carbon sugar, a phosphate group, and a nitrogenous base.
- Ca 5-carbon sugar, a phosphate group, and a nucleic acid.
95These store and transmit hereditary, or genetic, information
- Anucleic acids
- Blipids
- Cproteins
- Dcarbohydrates
96Ribonucleic acid (RNA) and Deoxyribonucleic acid (DNA) are two kinds of
- Aproteins
- Blipids
- Cnucleic acids
- Dcarbohydrates
97macromolecule that contains carbon, hydrogen, oxygen, and nitrogen; needed by the body for growth and repair and to make up enzymes
- Anucleic acids
- Bproteins
- Clipids
- Dcarbohydrates
98compound with an amino group (−NH2) on one end and a carboxyl group (−COOH) on the other end
- Aamino acid
- Bsubstrate
- Cmonomer
- Dexothermic
99 Proteins and carbohydrates are similar in that both
- Aare polymers containing carbon, hydrogen, and oxygen.
- Bare monomers containing carbon, hydrogen, and oxygen.
- Care polymers containing carbon, hydrogen, and nitrogen
100Some ______________ control the rate of reactions and regulate cell processes. Some are used to form bones and muscles. Others transport substances into or out of cells or help to fight disease.
- Acarbohydrates
- Blipids
- Cproteins
- Dnucleic acids
101Large carbohydrate molecules such as starch are known as
- Alipids
- Bmonosaccharides
- Cpolysaccharides
102Many lipids are formed from glycerol and
- Afatty acids.
- Bmonosaccharides.
- Camino acids.
103How many levels of organization do proteins have?
- A2
- Bup to 3
- Cup to 4
104a process that changes, or transforms, one set of chemicals into another set
- Areactants
- Bproducts
- Cchemical reaction
- Dactivation energy
105a process that changes, or transforms, one set of chemicals into another set
- Areactants
- Bproducts
106a process that changes, or transforms, one set of chemicals into another set
- Areactants
- Bproducts
107a process that changes, or transforms, one set of chemicals into another set
- Alinks
- Breactions
- Cbonds
- Dsaturation
108a process that changes, or transforms, one set of chemicals into another set
- Aenergy
- Bgas
- Cliquid
- Dsolid
109Chemical reactions always involve changes in the chemical bonds that join atoms in compounds.
- AVerdadero
- BFalso
110energy needed to get a reaction started
- Aactive site
- Bactivation energy
- Creactants
- Dproducts
111Label the chart. Number 1 is
- Aproducts
- Bactivation energy
- Creactants
112Label the chart. Number 2 is
- Aproducts
- Bactivation energy
- Creactants
113Label the chart. Number 3 is
- Aproducts
- Bactivation energy
- Creactants
114 Activation energy is
- Athe energy needed to start a reaction.
- Bthe energy needed to speed up a reaction.
- Cthe energy needed to slow down a reaction.
115a substance that speeds up the rate of a chemical reaction in cells
- Aenzyme
- Bcatalyst
- Csubstrate
- Dactive site
116proteins that act as biological catalysts
- Acatalyst
- Blipids
- Cenzymes
- Dcompound
117Enzymes slow down chemical reactions that take place in cells.
- AVerdadero
- BFalso
118The reactants of enzyme-catalyzed reactions are known as
- Aenzymes
- Bsubstrates
- Ccohesions
- Dexothermic
119After a substrate binds to an enzyme,
- Athe substrate and enzyme are joined permanently.
- Bthe enzyme can start the process again once the products are released
- Cthe enzyme cannot be used in the process again
120The elements or compounds produced by a chemical reaction are known as
- Areactants.
- Benzymes
- Cproducts.
121Energy-absorbing reactions require the addition of
- Aenergy
- Benzymes
- Ccatalysts
122Which of the following statements is true?
- AAll proteins are enzymes
- BAll catalysts are enzymes.
- CAll enzymes are catalysts.
Información
- Descripción
- Test sobre Sci Chap 2, creado por Rose Helderman el 01/11/2017.
- Autor
- Rose Helderman
- Idioma
- English
- Visitas
- 0
- Etiquetas
- Valoración
- Aún sin valoraciones Valora este test