Chemical Reactions Review (8b) Question Preview (ID: 48793)


This Review Is For The Chemical Reactions Test For Unit 3 In Physical Science. TEACHERS: click here for quick copy question ID numbers.

How many carbon atoms are in this glucose molecule? C6H12O6
a) 3
b) 6
c) 12
d) 24

How do substances form during a chemical reaction?
a) One or more substances are combined
b) Chemical bonds in molecules add atoms to make more molecules
c) A solid substance is formed in a solution
d) Chemical bonds break atoms rearrange and new chemical bonds form

What charge does chlorine have?
a) +1
b) -1
c) +7
d) -2

Nitrogen dioxide is a covalent compound. How many oxygen atoms are in a nitrogen dioxide molecule?
a) 3
b) 2
c) 1
d) 0

What is the force that holds atoms together called?
a) chemical solution
b) chemical mixture
c) chemical reaction
d) chemical bond

Which of the following states the law of conservation of mass?
a) Atoms are rearranged in a chemical reaction and some join new molecules
b) Two compounds combine to form a new compound with different properties
c) Mass cannot be created or destroyed in a chemical reaction
d) Energy is neither created or destroyed in a chemical reaction

Which of the following chemical reactions illustrates a synthesis reaction?
a) H2O yields H2 + O2
b) H2 + O2 yields H2O
c) KI + Cl2 yields KCl and I2
d)

Which of the following is an example of a chemical reaction?
a) ice melting in a glass of water
b) paper turning soft when wet
c) salt crystals forming as sea water evaporates
d) leaves changing colors in the fall

When do you use prefixes in the naming of a compound?
a) when you have two nonmetals
b) when you have a metal and nonmetal
c) when you have two metals
d)

Which is the product in the chemical formula N + O2 yields NO2?
a) N
b) O2
c) NO2
d)

What bond is between a metal and nonmetal?
a) covalent
b) ionic
c) metallic
d)

What is the formula for carbon dioxide?
a) CO
b) CH2
c) CO2
d) CH

Which of the following will NOT increase the rate of a chemical reaction?
a) adding a catalyst
b) increasing the surface area of a solid reactant
c) increasing the concentration of reactants
d) adding an inhibitor

In which kind of chemical reaction do two or more substances combine to form one new compound?
a) synthesis reaction
b) decomposition reaction
c) single-displacement reaction
d) double-displacement

Which of the following is PROOF that a chemical reaction has taken place?
a) a solid forms in a liquid
b) the color of a liquid changes
c) a new substance with different properties is formed
d) a substance becomes noticeably warmer

In a single-displacement reaction
a) a more reactive element can replace a less reactive element
b) only metals and nonmetals can react
c) a less reactive element can replace a more reactive element
d) most often nonmetals are involved

In a ______________________ reaction ions in different compounds switch places.
a) single replacment
b) ionic compound
c) covalent compound
d) coefficient

When a metal and a nonmetal are in a compound it is called a _____________________________.
a) single replacement
b) ionic compound
c) covalent compound
d) coefficient

A(n) _________________ is used to balance chemical equations.
a) single replacement
b) ionic compound
c) covalent compound
d) coefficient

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