THE ATOM
Hydrogen
Oxygen
Carbon
O
C
The unit for the mass ¡n the international system of units is:
Boiling water
physical change
What is the matter?
Everything that has mass and volume
HOW MANY STATES OF MATTER EXISTS?
4
H2O
the unit for time and for lenth are:
seconds and meters
wood burning into ash and smoke
CHEMICAL CHANGE
TELL 3 GENERAL PROPERTIES OF THE MATTER
- MASS
-VOLUME
-TEMPERATURE
What process changes a liquid into a gas?
Evaporation or boiling.
What are the three main subatomic particles of an atom, and what are their respective charges and locations?
electron- negative charge- electron cloud
proton- positive charge- core
neutron- neutral charge- core
What is a hypothesis?
A hypothesis is a statement that explains an observation or a scientific problem, which can be tested through experiments.
Fermentation
CHEMICAL CHANGE
What are the two types of mixtures?
Homogeneous mixtures and heterogeneous mixtures.
What state of matter has a definite shape and volume?
SOLID
What do the symbols A and Z represent in atomic structure, and how are they related to an element’s identity?
A represents the mass number, which is the total number of protons and neutrons in the nucleus.
Z represents the atomic number, which is the number of protons in an atom. The atomic number determines the element’s identity because each element has a unique number of protons.
What are the main steps of the scientific method?
Observation – Identifying a problem or question.
Hypothesis – Forming a testable explanation.
Experiment – Testing the hypothesis with controlled experiments.
Data Collection & Analysis – Recording and interpreting results.
Conclusion – Determining if the hypothesis is supported or rejected.
Communication – Sharing results with the scientific community.
salt dissolving in water
PHYSICAL CHANGE
Salad, sand and water, oil and water, granite are examples of:
HETEROGENEOUS MIXTURES
Which state of matter has no fixed shape and no fixed volume?
The data for the carbon is: A=12; Z=6
How many electrons, protons and electrons has?
6 electrons, 6 protons and 6 neutrons
THE UNIT FOR SPEED IS:
THINK ABOUT IT
SPEED OR VELOCITY IT IS THE RATIO BETWEEN THE LENGTH AND TIME
m/s
What is the difference between physical and chemical changes?
A physical change affects the form or appearance of a substance but does not change its chemical composition. Examples include melting, freezing, and cutting. A chemical change occurs when a substance transforms into a new substance with different properties, such as burning, rusting, or digestion.
WHAT IS THE DIFFERENCE BETWEEN SIMPLE SUBSTANCES AND COMPOUNDS?
An element is a pure substance which contains identical atoms or molecules with only one type of atoms/elements.
A compound is a pure substance which contains two or more types of atoms/elements.
What is the fourth state of matter, found in stars and lightning?
plasma