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פרק 1
חוקים ותאוריות מדעיות
In science, a law is defined as a concise, verbal or mathematical, statement that summarizes a vast number of experimental observations. It…
השיטה המדעית
Chemistry is an empirical science. Scientists often pose questions to understand the chemistry in everyday life and seek answers to these questions.…
סיווג חומרים על פי מצב
Chemistry is the study of matter and the changes it undergoes. Matter is anything that has mass and occupies space. Matter is all around us; the air,…
סיווג חומרים על פי הרכב
According to its composition, the matter can be classified into two broad categories — pure substances and mixtures.  A pure substance…
תכונות פיזיקליות וכימיות של חומר
The characteristics that enable us to distinguish one substance from another are called properties. A physical property is a characteristic of…
מהי אנרגיה?
The universe is composed of matter in different forms, and all forms of matter contain energy.  The different forms of energy on Earth originate…
מדידה: יחידות סטנדרטיות
Every measurement provides three kinds of information: the size or magnitude of the measurement (a number), a standard of comparison for the…
מדידה: יחידות נגזרות
The International System of Units or SI system, by international agreement, has fixed measurement units for seven fundamental properties: length,…
אי וודאות במדידה: נכונות ודיוק
Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the…
אי וודאות במדידה: קריאת מכשירים
Counting is the type of measurement that is free from uncertainty, provided the number of objects being counted does not change during the process.…
אי וודאות במדידה: ספרות מדעיות
All the digits in a measurement, including the uncertain last digit, are called significant figures or significant digits. Note that zero may be a…
אנליזה מימדית
Dimensional analysis, also known as the factor label method, is a versatile approach for mathematical operations. The main principle behind this…

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