A PURE SUBSTANCE THAT CAN’T BE BROKEN DOWN FURTHER BY ORDINARY CHEMICAL MEANS: a. A compound b. A molecule c. An ion d. An element e. An isotope

CHEMISTRY REVIEW

A PURE SUBSTANCE THAT CAN’T BE BROKEN DOWN FURTHER BY ORDINARY CHEMICAL MEANS:

a. A compoundb. A moleculec. An iond. An elemente. An isotope

SAME NUMBER OF PROTONS BUT DIFFERENT NUMBER OF NEUTRONS:

a. A compoundb. A moleculec. An iond. An elemente. An isotope

WHEN NUCLEUS IS UNSTABLE AND BEGINS TO BREAKDOWN EMITTING PARTICLES AND RADIATION:

a.Half-lifeb.Decayc.Parentd.Daughtere.None of the above

ELEMENTS THAT UNDERGO DECAY BECAUSE OF AN UNSTABLE NUCLEUS:

a.Radioactive isotopeb.Ionc.Moleculed.Compounde.Element

ALL ARE TRUE OF RADIOACTIVE ISOTOPES EXCEPT:

a. Living things take up radioactive isotopes in the same way as nonradioactive forms.

b. Isotopes of the same element act the same way chemically because they have the same number of protons and electrons

c. Radioactivity is easily detected

d. Radioactive isotopes are useful as tracers or biological spies

e. The parent is the element the radioactive isotope changes into

HOW CAN RADIOACTIVE ISOTOPES BE HARMFUL?

a.Burnb.Damage DNAc.Damage haird.Poisonouse.Cells can’t use them

Amount of time it takes for half of the parent isotope to decay into daughter:

a. Half-lifeb. Decayc. Erad. Epoche. None of the above

Which method quantitates the age of a fossil?

a. Relative datingb. Radiometric dating

Initially a rock when first formed contained 400 grams of a radioactive isotope and zero amount of daughter. Today the rock contains 12. 5 grams of parent. The half- life for this radioactive is 10 years. How old is the rock?a.10 yearsb.20 yearsc.30 yearsd.40 yearse.50 years

What four atoms make up 96% of living things?

a.Carbon, hydrogen, oxygen, nitrogenb.Carbon, hydrogen, oxygen, siliconc.Carbon, hydrogen, sodium, nitrogend.Carbon, sodium, chlorine, oxygene.Carbon, hydrogen, oxygen, sodium

How many electrons needed to fill inner most shell and outermost shell?

a.2,2b.2,8c.8,2d.8,8e.None of the above

If carbon has an atomic number of six. How many valence electrons does it have?

a.2b.3c.4d.5e.6

The two ways atoms can fill their valence shell:

a. ?b. ?

Sharing of electrons:

a.Covalent bondsb.Ionic bondsc.Hydrogen bondsd.Hydrophobic bondse.Hydrophilic bonds

Transfer of electrons


Most bonds between atoms that make biomolecules that make living things are:


Two or more atoms covalently bonded:

a.Ionb.Elementc.Moleculed.Compounde.isotope

How many electrons are shared in a single covalent bond, double covalentt bond and triple covalent bond?

a.1, 2, 3b.2, 4, 6c.2,2,2d.3, 5, 7e.None of the above

One atom has 12 protons and a mass number of 24. Another atom has 12 protons and a mass number of 30. What are these atoms called?

a.Ionsb.Isotopesc.Polard.Nonpolare.None of the above

Oxygen has an atomic number of eight. How many bonds can it make?

a.1b.2c.3d.4e.5

Unequal sharing of electrons

a.Ionic bondb.Polar covalent bondc.Nonpolar covalent bondd.Hydrogen bonde.Hydrophobic bond

Equal sharing of electrons:


Measure of an atoms attraction for an electron:

a.Polarityb.Nonpolarc.Electronegativityd.Isotopee.Ion

If two atoms have a big difference in their electronegativity and they are sharing electrons the bond will most likely be:


If oxygen forms a bond with hydrogen by sharing electrons the bond will be:


What makes atoms unhappy?

a.They have a full valence shellb.They have a full inner shellc.Ice creamd.They have an unfilled valence shelle.They have a full set of protons

When atom gains an electron:

a.It becomes a positive ionb.It becomes a negative ionc.It becomes an isotoped.It remains a neutral atome.None of the above

When an atom loses an electron:

a.It becomes a positive ionb.It becomes a negative ionc.It becomes an isotoped.It remains a neutral atome.None of the above

When a positive ion is attracted to a ion, what type of bond forms?


The breaking of bonds, rearrangement of atoms, and formation of new bonds:

a.Ionic bond formationb.Covalent bond formationc.Chemical reactiond.Both a and be.None of the above

The substances that enter into a chemical reaction.

a.Productb.Reactantc.Iond.Isotopee.Neutron

Substances produced by the reaction. Formed by the change.

a.Productb.Reactantc.Iond.Isotopee.Neutron

All are true of chemical reactions EXCEPT:

a.Only way a living cell can build large complex molecules needed to grow, reproduce, & maintain itself is via biosynthesis chemical reactions. b. All chemical reactions are accompaniedby a change in energy.c. Atoms can be createdd. Atoms can’t be destroyed

A chemical reaction that builds large complex molecules from simpler Molecules:

a.Decompositionb.Biosynthesisc.Energy releasingd.Energy storing (absorbing)e.Both b and df.Both a and c

Break down large complex molecules into smaller molecules releasing energy that can be used for work:

a.Decompositionb.Biosynthesisc.Energy releasingd.Energy storing (absorbing)e.Both b and df.Both a and c

All are true of photosynthesis except:

a.Builds large complex molecule from b.simple moleculec.Stores (absorbs) energyd.Exothermice.Makes foodf.Captures light energy

All are true of cell respiration EXCEPT:

a.Breaks down large molecules into simpler moleculesb. Energy released can be used to do workc. Exothermicd. Makes foode. Decomposition reaction

Speeds up chemical reactions in cells without raising temperature:

a.Enzymesb.Ionsc.Protonsd.Neutronse.Electrons

Energy required to get a chemical reaction started:

a.Endothermic energyb.Exothermic energyc.Exergonic energyd.Catabolic energye.Activation energy

C6H12O6 + 6O2 -> 6CO2 + 6H2O

How many oxygen’s on reactant side?How many different types of molecules?How many of each atom on reactant side?How many types of atoms?

What is the law of conservation of mass?

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A PURE SUBSTANCE THAT CAN’T BE BROKEN DOWN FURTHER BY ORDINARY CHEMICAL MEANS: a. A compound b. A molecule c. An ion d. An element e. An isotope