chem activity
Which of the following is the correct electron configuration for Zn2+?
1s^2, 2s^2, 2^p6, 3s^2, 3p^6, 4s^0, 3d^10
What is the maximum number of electrons allowed in a single atomic energy level in terms of the principal quantum number n?
2n^2
You can't live without water! What is its chemical formula?
H2O
Who is credited with the invention of the modern periodic table?
Mendeleev
What term describes the energy needed to make a reaction occur?
activation energy
Where in the body is most of the iron located?
blood
What is the fourth most abundant element in the universe in terms of mass?
carbon
Organic chemistry is the study of the compounds that make up living organisms. All organic molecules contain:
carbon and hydrogen
DNA codes for proteins, which are the building blocks of organisms. What is the most abundant protein in the human body?
collagen
Name the type of reaction: AB yields A+B
decomposition
At room temperature, what is the only metal that is in liquid form?
mercury
What is the main gas found in the air we breathe?
nitrogen
What is the most common isotope of hydrogen?
protium
Water-based liquids can be described as acidic, neutral, or basic, with respect to pH. Which of these describes milk?
slightly acidic
Name the type of reaction: A+B yields AB
synthesis
