AP Chemistry Topic 1

When a sample of an unknown element is vaporized and injected into a mass spectrometer, the results shown below are obtained. Use these data to estimate the average atomic mass of this element.

• 117 amu

• between 117 and 118 amu

• between 118 and 119 amu

• between 119 and 120 amu

A clean strip of copper metal is massed and attached to a metal hook, suspended from a rubber stopper. The rubber stopper is placed into a very large test tube containing solid iodine, and the test tube is sealed. Iodine vapor is generated by gentle heating of the solid iodine at the bottom of the test tube. A white compound forms on the copper strip. The rubber stopper is carefully removed, and the resulting copper strip with the white compound is massed. The white compound is washed from the surface of the metal, and the copper strip is dried completely and massed. The data table is below. What is the empirical formula for this compound?

• CuI

• CuI₂

• Cu₂I

• Cu₃I₄

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

• 5.03 g

• 4.41 g

• .614 g

• 10.1 g

Tags

NGSS.HS-PS1-7

A scientist conducts an experiment to characterize a bomb containing nitroglycerine. She uses a steel, rigid container for the test. What is the total pressure produced in this explosion? (Hint: PV=nRT)

• 25.0 atm

• 52.0 atm

• 179 atm

• 435 atm

Properties that describe how a substance reacts with other substances are called?

• Chemical properties

• Physical properties

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-5

Match the following

• 2 or more elements

• element

• same throughout

• homogeneous

• pure substance that can't be broken down

• compound

• varies throughout

• heterogeneous

The characteristics of a material that become evident when the material undergoes a chemical reaction. Cannot be physically observed.

• Physical Properties

• Chemical Properties

• Positive Properties

• Neutral Properties

Tags

NGSS.MS-PS1-2

Define chemical properties

• A characteristic that does not involve a change in the identity of a substance,

• A characteristic that determines how a substance will change into another substance

• A chemical property the identity does not change when in a physical property it turns into a new substance.

• A physical property the identity does not change when in a chemical property it turns into a new substance.

Tags

NGSS.HS-PS1-1

Match the following properties with their classification as either an intensive or extensive property.

• Temperature at which an object changes from solid to liquid

• Silver

• Amount of matter in an object

• Melting point

• Color of an object

• Mass

• Appearance of an object

• Metallic

A ​ (a)   is a material made from atoms of two or more combined elements.

• compound

• element

• chemical

• mixture