Chapter 2 Chemistry of Life

     Which of the following is NOT one of the six elements that make up 95% of the body weight of organisms?

• Hydrogen

• Nitrogen

• Carbon

• Iron

   Which of the following statements is true?

• All isotopes give off subatomic particles.

• All isotopes are radioactive.

• All isotopes have the same number of protons.

• All isotopes have the same number of neutrons

Answer explanation

We didn't talk about EVERY aspect in the answers, but you should definitely know that isotopes keep the same # of protons.

Tags

NGSS.HS-PS1-8

What type of bond is formed when atoms share electrons?

• Ionic

• Covalent

• Hydrogen

• None of these

Which of the following has a basic pH?

• Lemon Juice

• Antacids (Tums)

• Tomatoes

• Hydrochloric Acid

Aquatic organisms are able to survive the winter due to which specific property of water?

• water is less dense as a solid than as a liquid

• Water is cohesive and adhesive

• Water is the universal solvent

• Water has a neutral pH

The three isotopes of carbon 12C, 13C and 14C have different numbers of _______?

• electrons

• protons

• neutrons

• orbitals

The number of ___________ is always equal to the number of electrons in a neutral atom.

• orbitals

• neutrons

• bonds

• protons

If an atom has an atomic number of 17 and an atomic mass of 35, the number of neutrons in its nucleus equals _____.

• 17

• 18

• 35

• 52

An electrically neutral atom with an atomic number of 7 will have _____ electron shell(s).

• one

• two

• three

• four

Which bond is more easily broken?

• hydrogen

• polar covalent

• nonpolar covalent

• ionic