Chemistry Exam

which state of matter has atomic spacing that is far apart and definite shape liquid solid gas plasma none of the above

None of the above

A sample of 508.4 grams of copper completely reacted with oxygen to form 572.4 grams of a copper oxide product. How many grams of oxygen must have reacted? 508.4 32.0 636.4 64.0 572.4 none of the above

64.0

which among the following statements is false A)a solid has a definite shape and definite volume B)none of the above C)a gas has neither definite volume nor definite shape D)a liquid has a definite volume, but has no definite shape E)both solids and liquids are incompressible while gases are compressible

B

True or False energy is the single main component of the universe

False

When energy as heat is removed from a liquid-gas system (see below) at equilibrium, a new equilibrium state will have all vapor equal amounts of liquid and vapor a higher percentage of liquid a higher percentage of vapor

a higher percentage of liquid

Which of the following statements about physical and chemical changes is FALSE? Phase changes are always physical changes. In a chemical change, matter changes its composition. Chemical reactions are chemical changes. In a physical change, matter does not change its composition. All of the above statements are true

all statements are true

Which of the following items is NOT a common unit of energy? none of the above a)kilocalorie b)calorie c) torr d) joule

c

Which type of energy is associated with motion? none of the above electrical potential kinetic chemical

c

_______changes alter the identity of a substance, whereas______changes do not

chemical and physical

The law of Conservation of energy states that is in any process, energy is neither ________ nor ____________

created nor destroyed

a pure substance is a)composed of two or more regions b) none of the above c)composed of two or more different types of atoms or molecules combined in variable proportions d)composed of two or more different types of atoms or molecules that has constant composition e)composed of only one type of atom or molecule.

e

identify witch materials are elements and which are compounds Carbon Water Aluminum Foil

element compound element

During the process of heating, a gas

gains kinetic energy

which state of matter has atomic spacing that is far apart and indefinite shape

gas

which state of matte has atomic spacing that is close together and indefinite shape

liquid

What property stays the same during physical and chemical changes? Shape Density Arrangement of particle Mass

mass

How would you classify granola? mixture-homogeneous mixture-heterogeneous pure substance-element none of the above pure substance-compound

mixture- heter

which type of energy is associated with position

poterntial energy

How would you classify sugar? none of the above pure substance-compound mixture-heterogeneous mixture-homogeneous pure substance-element

pure substance compound

the two states of matter that occupy a definite volume are

solid and liquid

If a solid piece of shiny sodium metal is exposed to chlorine gas, a large amount of heat is released and the white solid sodium chloride (table salt) forms. Based on this information, which of the following statements is TRUE? Mass is lost during this process. none of the above This process represents a physical change. This process represents a chemical change. Sodium chloride is an element.

this process represents a chemical chnage

Physical properties are

those that a substance displays without changing its composition