Ch. 7-Chemical Reactions Question Preview (ID: 44654)


Repeats 22/35. TEACHERS: click here for quick copy question ID numbers.

According to the law of conservation of mass, how does the mass of the products in a chemical reaction compare to the mass of the reactants?
a) there is no relationship
b) the mass of products is sometimes greater
c) the mass of the reactants is greater
d) the masses are always equal

One of the chemical properties of bases is that they _______________________.
a) taste sour
b) feel slippery
c) crumble
d) corrode metal

The surface tension in a cup of water is caused by _______________________.
a) attractive forces between the water and its container
b) attractive forces between the water molecules
c) adhesive forces between water molecules
d) adhesive forces between the water and its container

The particles that make up an atom are ______________________.
a) electrons, protons, and nuclei
b) elements, protons, and electrons
c) protons, neutrons, and nuclei
d) protons, neutrons, and electrons

Which of the following changes is chemical rather than physical?
a) water is boiled
b) aluminum foil is crumpled
c) glass is shattered
d) wood is burned

A basic sample has pH range ______________________.
a) between 0 and 7
b) between 7 and 14
c) of exactly 7
d) of exactly 0

A characteristic of matter that sllows it to change to something new is a ____________________.
a) physical property
b) physical change
c) chemical property
d) chemical change

The maximum number of electrons in the second energy level of an atom is _______________.
a) two
b) four
c) eight
d) ten

Which of the following is an example of a physical change?
a) evaporation in a swamp cooler
b) electricity produced by a dry cell
c) digestion of a hamburger
d) rusting of a car body

Which of the following factors would not speed up a chemical reaction?
a) increasing the concentration of a reactant
b) adding a catalyst
c) raising the temperature
d) making the reactant particles larger

Kinetic energy is the ________________ of motion.
a) temperature
b) energy
c) heat
d) state

Which of the following is an example of a chemical change?
a) painting a house
b) freezing water
c) bending steel
d) baking soda in water

A substance that speeds up chemical reactions in the human body is __________________.
a) an inhibitor
b) an enzyme
c) polar
d) a prohibitor

Acids and bases can be all of the following except _____________
a) living
b) useful
c) harmful
d) edible

The _________________ is a unit of force.
a) pascal
b) atmosphere
c) newton
d) kilopascal

Which of the following changes gives NO evidence that a chemical reaction has taken place?
a) a cube of solid forms a puddle of liquid
b) a certain liquid is added to a solid, and bubbles of gas form
c) two liquids are mixed, and a precipitate forms
d) heating a blue solid turns the solid white

Which of the following conditions would likely cause the activation energy to be high?
a) atoms are close together
b) the temperature is hot
c) atoms are not close together
d) a catalyst is present

Which of the following materials will burn the fastest in open air?
a) a log, two feet in diameter
b) two logs. each one foot in diamter
c) a pile of small splinters made from a two-foot diameter log
d) both logs and the splinters will burn at the same rate

Which chemical is balanced?
a) Na + O2 = Na2O
b) Na2 + 2=2Na2O
c) 2Na + 2O2=2Na2O
d) 4Na + O2=2Na2O

In the compound H2O, the electrons in the bonds are unequally shared between oxygen and hydrogen, forming __________________.
a) cations
b) ionic bonds
c) nonpolor molecules
d) polar bonds

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