Review of 1-3

Matter and Change

100

Which kind of change do not involve any change

Physical Changes    

200

blend of two or more kinds of matter

mixture or pure substance?

mixture

300

mixtures (also called solutions) are uniform in composition,which is opposite of heterogeneous

homogeneous

400

What is the Law of conservation of energy

energy may not be created or destroyed

500

Chemistry is the study of:(      ), (      ), Properties of matter, Processes (reactions) that matter undergoes, Energy changes that follow these reactions

Composition, Structure

Measurements

100

1Km =     (    )m

1000

200

1m=(      )nm

10⁹

300

Significant Figures of 0.5556740

7

400

2.7851 cm → (      ) cm  3 Significant Figures

2.79

500

5400 + 365 =    (2 Significant Figures)

5800

Calculations

100

Significant Figures of 2.0×10³

2

200

2.0×10³ + 5.7×10³

7.7×10³

300

(3.0×10⁸ m/s) × (5.0×10² s)=

1.5×10¹¹ m

400

(1.5×1011 m) ÷ (3.0×108 m/s)=

5.0×102 s

500

2.0×10³ + 5.7×10³=

 7.7×10³

Atoms

100

 smallest unit of an element that maintains its chemical identity (size, reactivity, etc.)

Atom

200

Atoms can be further divided into (    )(    )(     )

Electrons  Protons Neutrons

300

Nucleus is  (     ) and  (    ) bound together at the center of the atom

protons (+) and neutrons (0)

400

What kind of charge in protons

postive

500

Does an atom show any charge? Why?

The number of protons and electrons(      )

No

 are equal