Acids and Bases
Elements
The Atom
Physics
Biology
100

This acid is found in lemons.

What is citric acid?

100

He created the modern periodic table. 

Who is Mendeleev?

100

The positive part of an atom. 

What is the proton?

100

This planet orbits the Sun the fastest. 

What is Mercury?

100

The color of chlorophyll. 

What is green?

200

The name of rain with a low pH. 

What is acid rain?

200

The percentage of the atmosphere that is oxygen. 

What is 21?

200

Two or more atoms joined together makes this. 

What is a molecule?

200

The Richter scale measures this. 

What is Earthquake magnitude?

200

Your body makes this vitamin when you are exposed to sunlight. 

What is vitamin D?

300

This purple fruit can be made into an indicator. 

What is a blueberry?

300

This element has the lowest boiling point. 

What is helium?

300

The loss of an electron turns an atom into this. 

What is an ion?

300

The length of time it takes sunlight to reach the Earth. 

What is 8 minutes?

300

This is the smallest marine mammal. 

What is the sea otter. 

400

Adding an acid to a base will make these two. 

What are water and salt?

400

The chemical symbol for tin. 

What is Sn?

400
He developed the model of the atom that we use. 

Who is Bohr?

400

The first human in space. 

Who is Yuri Gagarin?

400

The average adult human 32 of these. 

What are teeth?

500

This helps to maintain a constant pH. 

What is a buffer?

500

Coal is mainly made up of this element. 

What is carbon?

500

The process for splitting the atom. 

What is fission?

500

1 astronomical unit is equal to this. 

What is the distance between the Earth and the Sun?

500

The Portuguese Man-of-War is a type of this. 

What is jellyfish?

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