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