Life Science Chapter 9 Chemical Reactions

What products are formed from the complete reaction of hydrocarbons or carbohydrates with oxygen? A. CO2+H2O B. CO+H2O C. CH4+ CO2 D. CO2+H2

A. CO2+H2O

What type of chemical bond does the sharing of a pair of electrons form? A. covalent B. ionic C. metallic D. double

A. covalent

In a redox reaction, reduction is defined as the A. gain of electrons by an atom B. loss of mass of an atom C. loss of electrons by an atom D. gain of mass of an atom

A. gain of electrons by an atom

Atoms from an element in group IIA are allowed to react with atoms from an element in group VIIA. What type of compound is likely to form? A. ionic B. covalent C. polar covalent D. none at all

A. ionic

Ionic compounds are generally A. white, crystalline solids B. gaseous substances C. syrupy liquids D. amorphous solids

A. white, crystalline solids

Atoms that have eight valence electrons would tend to A. be very reactive B. be inert C. form positive ions D. form negative ions

B. be inert

What is the correct name for the compound, CaF2? A. calcium flourine B. calcium flouride C. calcium diflourine D. monocalcium diflourine

B. calcium flouride

The amount of energy released when wood is burned is A. greater than the amount of solar energy absorbed during its formation B. equal to the amount of solar energy absorbed during its formation C. less than the amount of solar energy absorbed during its formation D. greater or less than the amount of solar energy absorbed during its formation, depending on how it is burned

B. equal to the amount of solar energy absorbed during its formation

Consider the electron dot diagram of the unknown element X: This atom would most likely A. form an ion of +6 charge B. react with hydrogen to from H2X C. lose two electrons when forming an ion D. form an ion of +2 charge

B. react with hydrogen to form H2X

To what chemical reaction class does this reaction belong? 2 Mg(s)+O2(g)-->MgO(s) A. combination B. ion exchange C. decomposition D. replacement

C. decomposition

To what chemical reaction class does this reaction belong? CaCO3(s)-->CaO(s)+CO2(g) A. combination B. ion exchange C. decomposition D. replacement

C. decomposition

Atoms of an element tend to gain or lose electrons so that they will A. have the same number of protons as electrons B. become electrically neutral C. have the same number of outer orbital electrons as a noble gas D. have the same outer shell arrangement as a metal

C. have the same number of outer orbital electrons as a noble gas

Which combination of elements results in the formation of a white crystalline solid that dissolves to form a solution that conducts electricity? A. metal and metal B. non-metal and non-metal C. metal and non-metal D. metal and metalloid

C. metal and non-metal

The smallest unit of a covalent compound that still retains the properties of the compound is called a(an) A. electron B. atom C. molecule D. dipole

C. molecule

The formation of a positive ion A. occurs when an atom gains a proton B. involves a release of energy C. occurs when an electron is removed from an atom D. occurs in covalent bonding

C. occurs when an electron is removed from an atom

A chemical bond that involves somewhat unequal sharing of electrons is called A. ionic B. covalent C. polar D. coordinate

C. polar

Which is the more active metal? A. silver B. lead C. zinc D. sodium

C. zinc

Evidence of a chemical reaction includes A. a color change B. a change in temperature C. the production of a gas D. all of these

D. all of these

The formation of an ionic bond A. involves a transfer of one or more electrons B. results in a release of energy C. helps atoms achieve a noble gas electron arrangement D. all of these

D. all of these

In an ionic compound, the metal A. usually forms a negative ion B. takes the "-ide" ending C. has a Greek prefix like, mono, di, or tri D. is written first

D. is written first

An atom becomes a positive ion by gaining an electron.

False

Atoms gain or lose electrons in chemical reactions in order to increase their energy state.

False

Ionic bonds occur between atoms from adjacent chemical families in the periodic table.

False

The "-ide" ending in nitrogen dioxide tells you that this is an ionic compound

False

The "2" in Mg(OH)2 tells you that the charge of the hydroxide ion is (-2).

False

A covalent bond is shared pair of electrons.

True

A mixture can be distinguished from a pure substance because it can be separated by physical means.

True

Atoms gain or lose electrons in order to attain a valence orbital arrangement like that of a noble gas.

True

The representative elements have one to eight valence electrons.

True

Three hydroxide ions are needed to from a neutral ionic compound with an aluminum ion.

True