Question

1) How is the atomic mass if an element calculated?

a) Protons plus electron

b) Electron plus neutrons

c) Protons plus neutrons

d) Number of protons

2) Carbonic acid is a useful buffer in the blood. What is its purpose?

a) Regulate water content

b) Regulate blood flow

c) Regulate pH

d) Regulate metabolism

3) The substance in which the solute is dissolving into is known as the

a) Suspension

b) Mixture

c) Solution

d) Solvent

4) Bacon grease is solid at room temperature and vegetable oil is a liquid. Although they have different properties, what type of biochemical compound describes both of them?

a) Nucleic acids

b) Carbohydrates

c) Lipids

d) Proteins

5) An isotope has the same number of protons and a

a) Different number of electrons

b) Different number of neutrons

c) Different number of electrons and neutrons

d) Same number of electrons as neutrons

6) What is the molecular weight of ethanol; C2H5OH (atomic weight of each elements are C=12g/mol, H=1 g/mol, O=10g/mol)?

a) 46 g/mol

b) 45 /mol

c) 34 g/mol

d) 40 g/mol

7) What chemical compound is a base?

a) NaOH

b) NaCL

c) KCL

d) HCL

Answer 1

1) How is the atomic mass if an element calculated?

atomic mass --> by addition of all proton + neutron ( electrons are so light, that there is no need to account for it)

2) Carbonic acid is a useful buffer in the blood. What is its purpose?

H2CO3 <-> H+ + HCO3- will have a pH = 6.9 approx

which is usefull for pH regulation of blood

3) The substance in which the solute is dissolving into is known as the

the solution is mad eup by solute + solvent

choose solvent

4) Bacon grease is solid at room temperature and vegetable oil is a liquid. Although they have different properties, what type of biochemical compound describes both of them?

oil + fat are -->

c) Lipids

5) An isotope has the same number of protons and a

b) Different number of neutrons

by definition, isotopes must hav ethe same atomic number / pproton number, and only changes in amount of neutrons

6) What is the molecular weight of ethanol; C2H5OH (atomic weight of each elements are C=12g/mol, H=1 g/mol, O=10g/mol)?

MW = 2*C + 6*H + 1*O = 2*12 + 6*1 + 16

MW = 46 g/mol approx

7) What chemical compound is a base?

a base odnates OH- to solution

from the list

only NaOH will do