What is the maximum number of electrons that can occupy the 2s orbital?
2
8
6
3
If Argon is a noble gas and its atomic number is 18, how many electrons can be found in the valence level?
36
8
6
18
Which of the following statements is true?
Electrons circle the nucleus like Earth around the Sun
Electrons removed from atoms always increase the stability
The energy of electrons decreases with increasing distance
Valence electrons are in the outermost shell
All of the following statements are true, EXCEPT _____.
sugars are found only in plants
starch is composed of amylopectin and amylose
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 carboxylic acids.
Amines and alcohols.
Hydroxyl groups and ethers.
Ethers and amines.
Carlos just finished an exhausting workout. Which of the following carbohydrates can be readily used by his body as a source of fuel?
Dietary fiber
Cellulose
Any kind of polysaccharide.
Glucose
Proteins are biological molecules made of _____.
sugars
nucleotides
amino acids
glycerol
What atoms are connected by a peptide bond?
Carbonyl carbon and carbonyl oxygen
Side chain groups
Amine nitrogen and another amine nitrogen
Carbonyl carbon and amino group nitrogen
Proteins in our skin, hair, and nails are called what?
Storage proteins
Structural proteins
Transport proteins
Regulatory proteins
Which of the following is NOT a type of chemical bond?
Polar ionic bond
Polar covalent bond
Covalent bond
Ionic bond
Which of the following type of bond normally forms between two non-metal atoms?
Plastic
Covalent
Ionic
Metallic
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?
Store energy
Make up part of our cell membranes
Act as hormones
Generate heat
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 _____.
steroid hormones like testosterone are lipids
lipids are good at storing energy
all lipids are fats
lipids are biological molecules that are insoluble in water
In covalently bonded molecules, oxidation and reduction are determined by:
products that are synthesized
uneven sharing of electrons
reactants that are broken down
enzymes and coenzymes
