Question

1. an atom that has gained or lost electrons is called an ion.

a) true
b) false

1. a ______ reaction is symbolized as a+b→ab.

a. synthesis
c. exchange
b. decomposition
d. singe exchange

1. an exchange reaction can be symbolized as ______.

a)a+b→c+d
c)ab→a+b
b)a+b→ab
d)ab + cd → ac + bd

1. a ph value indicates the hydrogen ion concentration in solutions, including body fluids.

a) true
b) false

1. as hydrogen (h⁺) ion concentration increases, the ph number

a)gets.
c)stays the same.
b)gets smaller.
d)becomes negative.

1. an acid is defined as an electrolyte that releases hydrogen ions (h⁺) in water.

a) true
b) false

1. which of the following chemicals is not an inorganic substance?

a)water
c)sodium chloride
e)oxygen
b)protein
d)carbon dioxide

1. which of the following is not organic?

a)a carbohydrate
c)a lipid
b)a protein
d)carbon dioxide

1. cholesterol is a protein.

a) true
b) false

1. the building blocks of proteins are amino acids.

a) true
b)false

1. proteins include dna and rna.

a) true
b) false

1. the molecular formula $c_6h_{12}o_6$ describes which of the following molecules?

a)glycerol
c) glucose
b)a triglyceride
d)glycogen

1. the following are all considered lipids except:

a. steroid
c. sucrose
b. triglyceride
d. phospholipids

Explanation:

1. An ion is defined as an atom/molecule with a net charge from electron gain/loss.
2. Synthesis reactions combine two substances into one, matching A+B→AB.
3. Exchange reactions swap components between two compounds, matching AB + CD → AC + BD.
4. pH is a measure of hydrogen ion concentration in aqueous solutions, including body fluids.
5. pH is logarithmic: higher [H⁺] means lower pH value.
6. The Arrhenius definition states acids release H⁺ in water.
7. Proteins are organic (contain carbon-hydrogen bonds); others are inorganic.
8. Carbon dioxide lacks C-H bonds, so it is inorganic; others are organic biomolecules.
9. Cholesterol is a steroid lipid, not a protein.
10. Amino acids are the monomer units that form protein polymers.
11. DNA and RNA are nucleic acids, not proteins.
12. $C_6H_{12}O_6$ is the molecular formula for glucose.
13. Sucrose is a disaccharide (carbohydrate); others are lipid classes.

Answer:

1. a) True
2. a. Synthesis
3. D)AB + CD → AC + BD
4. a) True
5. B)gets smaller.
6. a) True
7. B)Protein
8. D)Carbon dioxide
9. b) False
10. a) True
11. b) False
12. C) Glucose
13. c. Sucrose