Mid Year Science Review

Chemistry, Earth history, Infectious diseases,

What is the Periodic Table?

The Periodic Table is a table that shows the elements found in nature and man-made elements that are used in science and everyday life. The elements are most reactive on the left and aren't as reactive going to the right. The table has 7 periods and 18 groups.
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What is the Atomic number, Atomic mass, And Neutrons.

The Atomic Number is over the Element symbol and is used to place elements in order on the table. The Atomic Mass is the number under the symbol and tells the mass in a special unit. Neutrons are the number that you have to add to the Atomic number to get the atomic mass. EX: Boron. atomic number:5. Neutrons:5. Atomic mass:10. 5+5=10


There are 7 Horizontal Periods & 18 Vertical Groups

What is the law of conservation of mass?

The Law of conservation of mass is a law that states that matter cannot be destroyed, only changed
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What are elements, compounds, and mixtures and how are they different?

A Element is a building block of matter that cannot be reduced in size because it is already the smallest measurement: an atom. Compounds are a mixture of two or more elements that can't be seen or broken apart physically. Ex: Hydrogen+Oxygen=H20. Mixtures are substances that mix with one or more other substances to form a completely new substance. Ex: A normal salad

What are physical and chemical properties?

Physical Properties are properties of a element, mixture, or compound that can be touched, tasted, smelled, heard, Etc. Chemical Properties are properties that only become evident in the Element during a Chemical Reaction or Breakdown.
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What are physical and chemical Changes?

Physical Changes are changes that effect the form of an object, not its chemical structure. Ex: blowing up a balloon. Chemical Changes make or break bonds between elements. Ex: A bike rusting after it sits outside in the rain.


Solution: a substance made as a result of mixing a solid and liquid, and the liquid dissolving. Ex: Syrup.

Matter: anything that has mass. Ex: Golf ball, Water, Balloon.

Atom: the building block of all matter.

Earth history

What is the Law of Superposition?

The Law of Superposition states that any rock layer on the bottom is oldest, and the top is youngest
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What is Relative and Absolute Dating?

Relative Dating is used to determine the age of a fossil, based off the known ages of other fossils within the same rock layer. Ex: a T-rex is found beside a trilobite. The trilobite is 300 million years old. because their beside each other, they know its age is within 300-400 million years old. Absolute Dating is giving an exact year to a fossils date of life

What is Half-Life/Radioactive Dating?

Half-Life is a technique that scientists use to determine the life of a fossil. Ex: normal half-life is 5,730. Radioactive Dating is a technique used to find the age by looking for radioactive isotopes.

What are Index Fossils

Index Fossils is a fossil that is useful for dating and comparing the area where its found.
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What is the Geologic Time Scale?

The Geologic Time Scale is a system of chronological measurement that relates classification to time, and is used by geologists, paleontologists, and other Earth scientists to describe the timing and relationships between events that have occurred throughout Earth's history.
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What are Ice Cores?

Ice Cores are removed pieces of ice, mostly from Antarctica, used to determine the weather and climate patterns of years or millions of years ago
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Infectious Diseases

What are Virus, Bacteria, Parasite, And Fungi?

A Virus is a small infectious agent that replicates only inside the living cells of other organisms. Viruses can infect all types of life forms, from animals and plants to bacteria.

Bacteria are small, Prokaryotic beings that have many shapes and are everywhere in the world.

Parasites are small organisms that use their hosts food without returning a benefit to the host.

Fungi are groups of mushrooms, yeasts, infections, and others.

Epidemic Vs. Pandemic

Epidemics are large spreads of an infectious disease that affect one area or country.

Pandemics are large spreads of an infectious disease that affect multiple areas, countries, and continents.

How to prevent/treat microorganisms.

Different microorganisms have different ways of being treated/prevented. Viruses are treated by Vaccines. Bacteria are treated by Antibiotics. Parasites are treated by mulitple things. Fungi is treated by creams and other similar things


Biotechnology is used to make new medicines and help Agriculture
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