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