The document provides an overview of topics covered in a science class, including the scientific method, chemistry, and the periodic table. It discusses the key steps of the scientific method, including observation, hypothesis, experimentation, and conclusion. It defines science as using observation to discover natural laws and principles. The document then covers chemistry topics - what is matter, the periodic table, atomic number, symbol, atomic weight, and the differences between elements, compounds, and mixtures. It provides examples to classify as elements, compounds, or mixtures.

1. QUARTER 1
WEEK 2-3
SCIENCE 7
KRIS ANN MAE Y. BONILLA
TEACHER

2. REVIEW
TOPIC: SCIENTIFIC METHOD
_______1. Which of these is not a step of the scientific method?
A. Making conclusion
B. Experimentation
C. Copying other's research
D. Observation
_______2. A hypothesis is...
A. A random thought
B. A wild guess
C. An opinion
D. An educated prediction
_______3. The Method of gathering information by using your senses is called a/an____________
a. Observation
b. experiment
c. conclusion
_______4. Scientific inquiry begins with...
A. A problem to solve or a question to answer
B. Observation
C. Laboratory tests.
D. A checklist of procedure

3. QUARTER 1:
CHEMISTRY

4. What is Science?
•The knowledge obtained by observing
natural events and conditions in order
to discover facts and formulate laws or
principles that can be verified or
tested.

6. SCIENCE
(JHS)
BIOLOGY
PHYSICS
EARTH
SCIENCE
CHEMISTRY

7. QUARTER 1:
CHEMISTRY

9. WHAT IS MATTER?

14. Introduction to the
Periodic Table
Atomic Number ● Symbol ● Atomic Weight
Element ● Compound ● Mixture

15. I am Dmitri Mendeleev!
I made the PERIODIC TABLE !

16. What is the PERIODIC TABLE?
oShows all known elements in
the universe.
oOrganizes the elements by
chemical properties.
oArranged in increasing
atomic number

17. How do you read the
PERIODIC TABLE?

18. What is the ATOMIC NUMBER?
oThe number of
protons found in the
nucleus of an atom
Or
oThe number of
electrons surrounding
the nucleus of an
atom.

20. Proton- positive charge particle; is equal
to number of electrons
Electron- negative charge particle
Neutron- no charge particle

21. What is the SYMBOL?
oAn abbreviation of the
element name.

22. What is the ATOMIC WEIGHT?
oThe number of protons and
neutrons in the nucleus of
an atom.

23. Proton- positive charge particle; is equal
to number of electrons
Electron- negative charge particle
Neutron- no charge particle

24. REMINDER!
o# of PROTONS = ATOMIC NUMBER
o# of ELECTRONS = ATOMIC NUMBER

25. Elements,
Compounds,
and Mixtures

26. What is an ELEMENT?
oA substance composed of a
single kind of atom.
oCannot be broken down into
another substance by
chemical or physical means.
oAn element is always
uniform all the way through
(homogeneous).

28. What is a COMPOUND?
A substance in which two
or more different elements
are CHEMICALLY bonded
together.
The properties of a
compound are usually
different than the properties
of the elements it contains.

33. What is a MIXTURE?
Two or more substances that are mixed together but are
NOT chemically bonded.
 Mixtures can be separated into their components by
physical means.
 The properties of a mixture are similar to the properties
of its components.
 Can be HOMOGENOUS or HETEROGENOUS mixture.

34. No chemical reaction between substances.

39. Element, Compound or Mixture?

40. Element, Compound or Mixture?
Carbon
monoxide

41. Element, Compound or Mixture?
air

42. Element, Compound or Mixture?

43. Element, Compound
or Mixture?

44. Element, Compound or Mixture?

45. Periodic Table cannot can element
chemically atom
 A pure substance containing only one kind of
__________ is an element.
 An element _____________ be separated into simpler
materials (except during nuclear reactions).
 Over 100 existing elements are listed and classified on
the ____________________.

46.  A pure substance containing two or more kinds of
_______________.
 The atoms in compounds are _________________
combined. They come together to form groups of
atoms called molecules.
 Compounds ___________________ be separated by
physical means. Separating a compound requires a
chemical reaction.
Periodic Table cannot can element
chemically atom

47. Mixtures:
Substances Homogenous Heterogenous
 Two or more ________________ that are NOT chemically
combined.
 Mixtures can be uniform (called
________________________) and are known as solutions.

 Mixtures can also be non-uniform (called
________________________).

48. ___Bronze
___Pizza
___Dry Ice (CO2)
___Baking Soda (NaHCO3)
___Titanium (Ti)