What is the maximum number of electrons that can occupy the 2s orbital?
2
8
3
6
If Argon is a noble gas and its atomic number is 18, how many electrons can be found in the valence level?
18
6
8
36
Which of the following statements is true?
Valence electrons are in the outermost shell
The energy of electrons decreases with increasing distance
Electrons circle the nucleus like Earth around the Sun
Electrons removed from atoms always increase the stability
All of the following statements are true, EXCEPT _____.
sugars are found only in plants
mammals store carbohydrates in the form of glycogen
pasta and cereals are good sources of carbohydrates
starch is composed of amylopectin and amylose
Which set of functional groups is always found in sugars?
Ethers and carboxylic acids.
Ethers and amines.
Amines and alcohols.
Hydroxyl groups and ethers.
Carlos just finished an exhausting workout. Which of the following carbohydrates can be readily used by his body as a source of fuel?
Glucose
Cellulose
Any kind of polysaccharide.
Dietary fiber
Proteins are biological molecules made of _____.
glycerol
nucleotides
sugars
amino acids
What atoms are connected by a peptide bond?
Amine nitrogen and another amine nitrogen
Side chain groups
Carbonyl carbon and carbonyl oxygen
Carbonyl carbon and amino group nitrogen
Proteins in our skin, hair, and nails are called what?
Transport proteins
Regulatory proteins
Storage proteins
Structural proteins
Which of the following is NOT a type of chemical bond?
Polar ionic bond
Covalent bond
Ionic bond
Polar covalent bond
Which of the following type of bond normally forms between two non-metal atoms?
Metallic
Covalent
Ionic
Plastic
What is the definition of a chemical?
two or more molecules connected together by chemical bonds
Two or more atoms connected together by chemical bonds
A material containing ionic bonds only
A material containing only non-metals
Which of the following roles do lipids NOT play in our bodies?
Act as hormones
Make up part of our cell membranes
Generate heat
Store energy
Why does soap remove grease from pans when we wash dishes?
The whole soap molecule is non-polar, so it breaks apart fat
Part of the soap is polar and part is non-polar
Soap molecules react with fats to break up fat blobs.
Soap sends a chemical message to fats to break up fat blobs
All of the following statements are true about lipids, EXCEPT that _____.
all lipids are fats
lipids are good at storing energy
steroid hormones like testosterone are lipids
lipids are biological molecules that are insoluble in water
In covalently bonded molecules, oxidation and reduction are determined by:
reactants that are broken down
uneven sharing of electrons
products that are synthesized
enzymes and coenzymes
