1easy
What is the chemical symbol for water?
2easy
What is the chemical symbol for oxygen?
3easy
What is the chemical symbol for carbon?
4easy
How many states of matter are commonly taught in basic science?
5easy
What gas do plants absorb from the air for photosynthesis?
6easy
What gas do humans primarily breathe in?
7easy
Table salt is primarily made of which two elements?
8medium
What is the chemical symbol for sodium?
9medium
What is the atomic number of carbon?
10medium
What does the pH scale primarily measure?
11medium
What type of bond forms when electrons are transferred from one atom to another?
12medium
What is the chemical symbol for gold?
13medium
What is the chemical symbol for iron?
14medium
How many protons does a hydrogen atom have?
15medium
What is CO2 commonly called?
16medium
Which element has the symbol K?
17medium
What is the most abundant element in the universe?
18medium
What is the chemical symbol for silver?
19hard
What is the atomic number of helium?
20hard
Which element has the symbol Pb?
21hard
What type of bond involves the sharing of electrons between atoms?
22hard
What is the chemical formula for table salt?
23hard
Which gas is the most abundant in Earth's atmosphere?
24hard
What is the chemical symbol for mercury?
25hard
How many elements are in the periodic table as of standard modern chemistry?