Sections 1&2

Question 1

Section 1:What is Chemistry?

What is Chemistry?

Answer 1

Chemistry is the study of the composition, stucture, and properties of matter, the processes that matter undergoes, and the energy changes that accompany these processs

Question 2

Section 1:What is Chemistry?

What is an Chemical?

Answer 2

Chemical:Matter of constant composition best characterized by the entites (molecules, formula units, atoms). It is composed of Physical properties such as density, refractive index, electric conductivity, melting point etc., to characterize the chemical substance. Any substance that has defined composition.

Examples of chemicals: water (H20), carbon dioxide, hydrogen gas,

Question 3

Section 1:What is Chemistry?

What is a Physical Property?

Answer 3

A physical property is a characteristic that can be observed or measured without changing the identity of the substance. We commonly use physical properties to describe a substance.

Examples of Physical Properties: Melting Point and Boiling Point

Question 4

Section 1:What is Chemistry?

What is a Chemical Property?

Answer 4

A chemical property relates to a substance’s ability to undergo changes that transform it into different substances.

Examples of Chemical Propertys: Flammablity and Toxictiy.

Question 5

Section 1:What is Chemistry?

What is a Chemical Change?

Answer 5

A change in which one or more substances are converted into different substances is called a chemical change or chemical reaction.

Question 6

What is Chemistry?

What are Reactants?

Answer 6

The substances that react in a chemical change are called the reactants.

Question 7

Section 1:What is Chemistry?

What are Products?

Answer 7

The substances that are formed by the chemical change are called the products.

Question 8

Section 1:What is Chemistry?

What is a Physical Change?

Answer 8

Physical Changes are changes in which the identity of a substance dosen’t change. However, the arrangement, location, and speed of the particles that make up the substance may change. Change of state are physical changes.

Question 9

Section 2:Describing Matter

What is Matter

Answer 9

Matter is anything that has mass and occupys space.

Question 10

Section 2:Describing Matter

What is Space?

Answer 10

Space is Volume
Volume is a measure of the size of a body or region in three-dimensio0nal space.

Question 11

Section 2:Describing Matter

What is Mass?

Answer 11

A measure of the amount in the object; a fundamental property of an object that is not affected by the forces that act on the object, such as the gravitational force.

Question 12

Section 2:Describing Matter

What is Weight?

Answer 12

A measure of gravitational force exerted on an object; its value can change with the location of the object in the universe.

Question 13

Section 2:Describing Matter

What is Quanity?

Unit of Measurement

Answer 13

An Quanity is something that has magnitude, size or amount.

Unit of Measurement

Question 14

Section 2:Describing Matter

What is a Unit?

Unit of Measurement

Answer 14

a quantity adopted as a standard of measurement

Unit of Measurement

Question 15

Section 2:Describing Matter

What is a Quantitative Property?

Unit of Measurement

Answer 15

something that can be measured as number (numeral)

Examples of Quantitative Property:That piece of meat weigh 0.5 lbs.

Question 16

Section 2:Describing Matter

What is a Qualitative Property?

Unit of Measurement

Answer 16

something that cannot be measured as number, but can be described as quality

Example of Qualitative Property:That piece of meat is juicy

Question 17

Section 2:Describing Matter

What does SI stand for?

Si Base Units

Answer 17

SI-Standard International unit bulit on seven based units

Question 18

Section 2:Describing Matter

Mass, m

Si Base Units

Answer 18

kilogram

Unit Abbreviation: kg

Question 19

Section 2:Describing Matter

Length, l

Si Base Units

Answer 19

meter

Unit Abbreviation: m

Question 20

Section 2:Describing Matter

Time, t

Si Base Units

Answer 20

second

Unit Abbreviation: s

Question 21

Section 2:Describing Matter

Temperature, T

Si Base Units

Answer 21

kelvin

Unit Abbreviation: K

Question 22

Section 2:Describing Matter

Electric Current, I

Si Base Units

Answer 22

ampere

Unit Abbreviation: A

Question 23

Section 2:Describing Matter

Amount of substance, n

Si Base Units

Answer 23

mole

Unit Abbreviation: mol

Question 24

Section 2:Describing Matter

Luminous intensity, I v

Si Base Units

Answer 24

candela

Unit Abbreviation: cd

Question 25

Section 2:Describing Matter

What is the Accuracy of measuring instrument?

Answer 25

Ability of a measuring instrument to give responses close to a true value.

Question 26

Section 2:Describing Matter

What is Precision?

Answer 26

Precision is the closeness of agreement between independent test results obtained by applying the experimental procedure under stipulated conditions.

Question 27

Section 2:Describing Matter

What is Percentage Error?

Answer 27

Percentage Error is the difference between estimated value and the actual value in comparison to the actual value and is expressed as a percentage.

Percentage error is calculated by subtracting the accepted value from the experimental value, dividing the difference by the accepted value, and then multiplying by 100.

Question 28

Section 2:Describing Matter

What is Significant Firgures?

Answer 28

Significant Firgures in a measurement consist of all the digits known with certainty plus one final digit, which is somewhat uncertain or is estimated.