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