Chemistry for Biology Nerds

Tums and Rolaids are medicines used to treat heartburn by reducing the acidity of stomach acid. What must be true about these medicines?

• They are basic.

• They have a pH greater than 7.0.

• They have more OH^- ions than H⁺ ions.

• All of these are correct.

Water molecules stick together. Why? (Not what do we call it when water molecules stick together.)

• Cohesion

• Adhesion

• Water molecules are polar, meaning they have areas with partial positive and negative charges. The positive part of one molecule sticks to the negative part of another molecule.

• Water molecules are negatively charged due to the electronegativity of oxygen. All of the negatively charged molecules are attracted to each other.

What do we call it when water molecules stick to each other? Or whenever any substance sticks to itself.

• Adhesion

• Cohesion

• Magnetism

• Magic!

What determine what element an atom is?

• The number of protons in its nucleus.

• The number of electrons in its nucleus.

• The number of neutrons in its nucleus.

• The total number of protons and neutrons.

Tags

NGSS.MS-PS1-1

This is like a multiple-multiple choice question! Choose all that apply to proteins.

• Monomers are amino acids.

• Have four different structures.

• Function as structural components and as enzymes.

• Contain oxygen, carbon, phosphorus, hydrogen, and nitrogen atoms.

• Useful because they can store energy for a very short time.

Two atoms of the same element that have different numbers of neutrons are called

• ions

• isotopes

• isomers

• radioactive

Enzymes are capable of increasing the rate of a chemical reaction through which of the following means?

• Changing the amount of energy that is released from the reactants.

• Changing the amount of energy that will remain in the products.

• Reducing the activation energy.

• Changing the equilibrium point of the reaction.

What happens to an enzyme in a chemical reaction? Choose all that apply.

• Nothing. The enzyme is unchanged and can be used over an over again.

• Nothing. The enzyme is unchanged and can be used over an over again.

• Nothing. The enzyme is unchanged and can be used over an over again.

• Nothing. The enzyme is unchanged and can be used over an over again.

When sodium (Na) reacts with chlorine (Cl), what kind of bond forms, and why? Choose all that apply.

• An ionic bond.

• An electron is transferred from Na to Cl, giving Cl a negative charge.

• A covalent bond.

• An electron will be shared between Na and Cl

When Magnesium (Mg) reacts with Sulfur (S), what sort of charge will Magnesium have when the reaction is complete?

• +1

• +2

• -1

• -2