Chemistry
General 8th grade science
More General 8th grade science
Physical Science
Earth & Space Science
100

The type of change that happens when chemical bonds break and new bonds form which creates a new substance.

Chemical change

100

Almost all multicellular organisms on Earth belong to this domain  

Eukarya

100

The type of plate boundary where the sea-floor spreading occurs 

What is divergent?

100

The Earth is made of ___% of fresh water

less than 3%

100

We get energy from eating food. What is the name of the energy we convert into energy used for cell function ?

ATP

200

The two most abundant element on Earth's 

Hydrogen and Oxygen 

200

The SI unit for force

 Newton

200

These types of fossils help tell the absolute age

Index Fossils

200

Where can I find valence electrons?

in the outermost shell

200

Principle where the youngest rocks are at the top of the sequence and the oldest are at the bottom.

 law of superposition

300

Products combine to form ______

Reactants

300

A liquid will become this state of matter if the particles gain kinetic energy

A gas

300

Genetic variations among individuals in a population give some an advantage in surviving and reproducing in their environment.

 Natural Selection

300

Which of the following represents a molecule that is not a compound? CO2, Fe, O2, and CO

Fe

300

The past and current movements of the Earth's crust provides an understanding of its geological history and causes Earthquakes

Plate Tectonics

400

In a chemical reaction ________ can never be created or destroyed. 

energy

400

Name 2 of the 5 physical properties.

shape, color, size, mass, texture (weight, odor)

400

Viruses can only be cured by 

Vaccines

400

Every molecule of water contains_____

two hydrogen and one oxygen atom

400

The loss of about 3/4 of all species in existence across the entire Earth over a “short” geological period of time.

What is a mass extinction?

500

Element group that are shiny, malleable, ductile, and good conductors

Metals

500

What does the atomic mass represent?

The sum of protons and neutrons 

500

The father of evolution

Charles Darwin

500

A typical atom of AL has 13 electrons and 14 neutrons. How many protons does this atom have?

13

500

The protective covering that encloses every cell is called 

Cell membrane

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